Patent Application
20080144430
The disclosure relates to fluid processing and, more particularly, high pressure fluid processing devices.
The creation and processing of fluids in a fluid mixture is desirable for a variety of industrial processes. For example, fluids may be mixed, reacted or otherwise combined to form emulsions, suspensions or solutions. As an example, fluids may be mixed to form coatings, inks, paints, abrasive coatings, fertilizers, pharmaceuticals, biological products, agricultural products, foods, beverages, and the like. For some of these products, such as colloidal dispersions, the size and uniformity of dispersed phases can be extremely important.
To produce dispersions in a desired size range, industrial dispersion processing techniques make use of one or more fluid processing devices. A fluid processing device processes the fluid mixture in a manner that subjects dispersed phases, such as particles or other units of microstructure, to intense energy dissipation through a combination of intense shear and extensional stresses and strains. In this manner, a smaller, more uniformly sized dispersed phase is created in the colloidal dispersion.
One example of a dispersion is a magnetic dispersion used in the coating of magnetic media, such as magnetic disks, magnetic tape or other magnetic media used for data storage. For magnetic media, the mixture may contain magnetic particulates and a polymeric binder carried in a solvent. A magnetic coating process involves application of the mixture to a substrate, followed by a drying process to remove the solvent. To ensure data storage reliability, uniformity of the magnetic particulate size within the dispersion is desirable.
The disclosure is directed to a high pressure, multi-stream, annular fluid processing device for combining fluids. The fluid processing device may be applicable to the mixture, reaction or combination of fluids containing one or more dispersed phases such as particulate structures, emulsions or immiscible materials. In this case, the fluid processing device may also be referred to as a dispersion processing device, which is used to mix, react or create a dispersed phase or other units of microstructure.
The fluid processing device may be useful in reducing the size of particles or other units of microstructure in one or more fluid mixtures and combining the mixtures to form dispersions, such as emulsions or suspensions. Alternatively, the fluid processing device may be applicable to the combination of fluids that do not carry dispersed phases, including the combination of fluids to form solutions or to form new materials as the result of chemical reactions. The new material may be soluble in the resultant fluid or immiscible with other fluids as would be the case for products that form emulsions or dispersions. In any case, the fluid processing device permits combination of two different fluids having different compositions to form a new combined product.
The fluid processing device includes opposing, annular fluid flow channels that have different annular path areas. For example, a first fluid flows from a fluid path into a first annular flow channel while a second fluid flows from another fluid path into a second annular flow channel. The fluids in the two annular flow channels move toward one another and impinge. In particular, the two annular flow channels flow toward one another and collide such that the first and second fluids mix, react, or otherwise combine with one another. When applied to a dispersion, the shear and extensional forces generated can create a smaller, narrower size distribution of dispersed phases. The different annular flow path areas of the annular fluid flow path channels allow fluids of different densities or viscosities to be mixed together with these techniques.
In one embodiment, the disclosure provides a fluid processing device that includes a first annular flow channel having a first annular path area that delivers a first fluid in a first direction and a second annular flow channel having a second annular path area that delivers a second fluid in a second direction opposing the first direction such that the first and second fluid collide and combine with one another. The first annular path area and the second annular path area are not equal. In addition, the fluid processing device includes an outlet that delivers a combined product of the first and second fluids.
In another embodiment, the disclosure provides a fluid processing system that includes one or more pumps that pump at least one of a first fluid and a second fluid, one or more heat exchangers that change the temperature of at least one of the first fluid and the second fluid, and a fluid processing device that processes the first fluid and the second fluid. The fluid processing device includes a first annular flow channel having a first annular path area that delivers the first fluid in a first direction and a second annular flow channel having a second annular path area that delivers the second fluid in a second direction opposing the first direction such that the first and second fluid collide and combine with one another, wherein the first annular path area and the second annular path area are not equal. The fluid processing device also includes an outlet that delivers a combined product of the first and second fluids.
In an additional embodiment, the disclosure provides a method that includes directing a first fluid into a first annular flow channel having a first annular path area that delivers the first fluid in a first direction and directing a second fluid into a second annular flow channel having a second annular path area that delivers the second fluid in a second direction opposing the first direction such that the first and second fluids collide and combine with one another, wherein the first annular path area and the second annular path area are not equal. The method also includes delivering a combined product of the first and second fluids via an outlet.
The invention, in various embodiments, may be capable of providing a number of advantages. In general, the disclosure may improve industrial manufacturing of coatings, inks, paints, abrasive coatings, fertilizers, foods, beverages, pharmaceuticals, drug delivery agents, biological products, agricultural products, or the like. The use of opposing, annular flow channels of the same or different annular flow areas may improve the processing of the dispersed phase from more than one fluid of different densities or viscosities, of different chemical compositions, or of different other characteristics producing a dispersed phase with reduced size and possibly enhanced size uniformity or producing a new material with controlled chemical composition, said material being either immiscible or soluble in the resultant fluid mixture. The annular path areas may be configured such that the impingement zone occurs approximately at the midpoint of the gap between the two annular flow channels.
Annular flow channels may enhance the energy dissipation due to wall shear forces in the fluid processing device, e.g., because of increased wall surface area for a given flow channel relative to a nozzle alone. A fluid processing device in accordance with this disclosure may be capable of handling input pressures as high as approximately 40,000 psi (275 MPa). The annular flow channels may also provide increased uniformity in mixing for more than one type of fluid in the region wherein the fluids impinge on one another or in the outlet of the device.
In addition, the disclosure may provide an automatic anti-clogging action that can improve the industrial manufacturing process by reducing or avoiding the need to manually clean and de-clog the fluid processing device which processes two different types of fluid. For example, the automatic anti-clogging action may be provided by implementing a cylindrical rod within a flow path cylinder, wherein the rod is free to move and impinge on the flow path cylinder to automatically remove or reduce clogging within the device. The automatic anti-clog action can reduce maintenance costs and avoid down-time of the manufacturing system.
The details of one or more embodiments of the disclosure are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the disclosure will be apparent from the description and drawings, and from the claims.
The disclosure is directed to a high pressure fluid processing device for combining fluids. The fluid processing device may be applicable to the combination of fluids containing one or more dispersed phases. The fluid processing device may also utilize two fluids each being of a single phase (e.g., pure material or solution) that may react to form either a solution or a fluid of two or more phases. In general, a dispersed phase may include dispersed particles, colloidal dispersions, or other matter separated by a phase boundary. The fluid processing device mixes, reacts or otherwise combines two or more fluids to produce a combined product of the fluids.
For example, the fluid processing device may be useful in reducing the size of dispersed particles or other units of microstructure in one or more fluid mixtures and combining the fluids to form dispersions, such as emulsions or suspensions. In addition, the fluid processing device may be applicable to a combination of fluids that do not carry particulate structures, including the mixture of fluids to form solutions. As examples, the fluid processing device may be used for preparation of coatings, inks, paints, abrasive coatings, fertilizers, foods, beverages, pharmaceuticals, drug delivery agents, biological products, agricultural products, or the like.
Some fluids to be mixed have different fluid properties, such as density, viscosity, or chemical composition that may or may not be caused by particles within the fluids. For this reason, the annular path area of each opposing annular fluid flow channel may need to be different in order to produce an impingement site that occurs between the annular flow channels instead of within one of the annular flow channels. For example, a first fluid is directed from a fluid path into a first annular flow channel having a first annular path area while a second fluid is directed from another fluid path into a second annular flow channel having a second annular path area. The two annular flow channels cause the two fluids to flow toward one another and collide with one another such that the first and second fluids mix, react or otherwise combine with one another. The flow channels are coaxial and may flow into opposite ends of a common cylinder, e.g., meeting at the middle of the cylinder. Each annular path area may be configured for specific fluids that will be mixed by the fluid processor. The two fluids typically include different particle dispersions or chemical compositions, but could be similar or identical in some cases.
An outlet adjacent to the point at which the first and second annular flow channels collide allows a fluid mixture flowing down the annular flow channels to be combined and expelled. The shear and extensional forces of the collision of the first fluid flowing down one annular flow channel with the second fluid flowing down the other annular flow channel supports mixing and/or reaction. The outlet may also provide turbulence that may aid the final mixing of the fluids from the first and second annular flow channels. For dispersions, the shear and extensional stresses and strains may be of sufficient magnitude to cause dispersed phases, such as particles, to be reduced in size, and to cause the fluids to mix, react or combine together prior to expulsion through the outlet. Since these shear and extensional forces change due to the density and viscosity of the fluid, the fluid processing device described herein may include two annular flow channels with different annular path areas in order to optimize the flow of the mixed fluid at the outlet.
A rod may be positioned within the flow path cylinder. The rod may be cylindrical, and defines the inner diameter of the annular flow channels. More specifically, an inner diameter of the flow path cylinder defines an outer diameter of the annular flow channels, and an outer diameter of the cylindrical rod positioned inside the flow path cylinder defines an inner diameter of the annular flow channels. In some embodiments, the rod may have a first diameter on one side and a second diameter on another side to define different inner diameters of each annular flow channel. In other embodiments, the flow path cylinder may define a first outer diameter of one annular flow channel and a second outer diameter of another annular flow channel. Thus, according to this disclosure, the flow path cylinder, the rod, or both may be configured to create two annular flow paths which have different annular path areas.
In some embodiments, the cylindrical rod may be free to move and vibrate within the flow path cylinder, which can provide an automatic anti-clog mechanism. If particles in the fluids become clogged inside the fluid processing device, the cylindrical rod can move or vibrate as a result of pressure imbalance caused by the clog. The movement of the cylindrical rod, in turn, may help to clear the clogged material and restore the pressure balance within the fluid processing device. In other embodiments, the rod may be fixed within the cylinder to prevent rod movement. In this case, controlled pressure pulses may be applied to serve as an anti-clog mechanism.
The outlet may be located approximately near the center or mid-point along the length of the flow path cylinder, and may have a fixed or adjustable width. In the case where the width of the outlet is adjustable, the outer diameter of the annular flow channels may be defined by the inner diameter of two cylinders positioned in series, with the outlet being defined as the lateral gap between the two cylinders. In that case, the cylindrical rod extends inside each of the two cylinders to define the inner diameter of the annular flow channels. The outlet size may be adjusted by moving one or both of the cylinders laterally relative to the other. In embodiments that include a rod having two different diameters, a step or slope that connects the two different diameters of each side of the rod may be located near or within the outlet area.
The two annular flow channels are coaxial and flow toward one another. For example, the fluids may be introduced into the flow channels at opposite ends of a cylinder, and meet one another substantially within the middle of the cylinder. The flow channels may have different inner and outer diameters. An outlet extends through the cylinder where the first and second annular flow channels collide, allowing fluids flowing down the annular flow channels to be mixed, reacted, or otherwise combined, and then expelled. The shear and/or extensional force of the collision of the first fluid flowing down one annular flow channel with the second fluid flowing down the other annular flow channel supports combination of the fluids prior to expulsion through the outlet.
For dispersions, the shear and/or extensional forces may cause the dispersed phase(s) in the fluids to be reduced in size, producing smaller particles, and also cause the fluids to mix, react or otherwise combine together prior to expulsion through the outlet. Fluid processing device 2 also may subject the fluids to wall extensional forces at the beginning and throughout the annular flow channels, further promoting mixing or reaction and a more consistently sized dispersed phase. In some particular applications, one or both fluids may include a dispersion of magnetic particles, e.g., for coating of magnetic data storage media. However, the invention is not so limited.
As shown in
System 10, with fluid processing device 2, may be particularly useful in processing coating solutions having high concentrations of solids. For example, system 10 may be used to process coating solutions having solid particle contents of greater than approximately ten percent by weight, although the system is not limited in that respect. For some industrial applications, a solution may carry hard, substantially non-compliant particles, such as magnetic pigments used for coating of magnetic media. System 10 may also be used for other industrial processes including, for example, the preparation of inks, paints, abrasive coatings, fertilizers, foods, beverages, pharmaceuticals, drug delivery agents, biological products, agricultural products, other media, and the like. In some embodiments, system 10 may be implemented to produce fluids with small particulates of consistent size, such as magnetic pigment particles. More generally, system 10 may be implemented to mix, react or combine two or more fluids having different compositions to produce a combined product of the fluids.
System 10 may initially prepare a first fluid and a second fluid before combining the two fluids and processing them together in annular fluid processing device 2. Each fluid uses a separate set of components during the process. The first fluid is contained within vessel 14 before being pumped by pump 16. Intensifier pump 20 increases the pressure of the first fluid and forces the fluid through heat exchanger 22 to heat or cool the mixture. The first fluid is then sent into annular fluid processing device 2 where it meets the second fluid. The second fluid is contained within vessel 24 before being pumped by pump 26. Intensifier pump 30 increases the pressure and delivers the second fluid to heat exchanger 32 before the fluid enters annular fluid processing device 2. Heat exchangers 22, 32 may be capable of operating in high pressure environments. Output 34 consists of the combined product containing the first fluid and the second fluid.
Heat exchangers 22, 32 are placed before annular fluid processing device 2 such that the temperature of the respective fluid is changed prior to introduction into the annular fluid processing device 2. Each heat exchanger 22, 32 may have a conventional design. For example, a heat exchanger 22, 32 may include a helical fluid carrying tube that passes through a heating or cooling medium, such as heated or cooled liquid or vapor. Placement of a heat exchanger after annular fluid processing device 2 is optional, and may not be necessary in many applications. Instead, in some embodiments, heat exchangers 22, 32 may be placed only prior to annular fluid processing device 2. Notably, in some embodiments, there is no need for re-pressurization of the fluids between the initial pressurization by intensifier pump 20 or 30, and introduction to annular fluid processing device 2.
In some embodiments, use of a heat exchanger prior to the annular fluid processing device 2 may be applicable not only to a device that processes multiple streams of fluids, but also a single stream or multiple streams of the same fluid, instead of different fluids. In other words, the first fluid and second fluid may have different compositions or substantially identical compositions. As an example, fluid processing device 2 may have a single inlet to receive a single fluid that is bifurcated into multiple streams within the fluid processing device 2. In preferred embodiments, however, fluid processing device 2 is equipped with multiple inlets to process multiple streams of a fluid with a substantially identical composition, or different fluids having different compositions, as described herein.
In some embodiments, more than two fluids may be prepared and sent to annular fluid processing device 2 in a manner similar to the first and second fluids. A plurality of fluids may be beneficial for certain applications where fluids need to be prepared under different conditions or the timing of the addition of certain fluids is integral to the final combined product leaving processing device 2.
One or more pumps 16 serve to draw the fluids from vessel 14 and deliver the fluids to intensifier pump 20. Again, in some embodiments, the fluids may not carry particulate structures. A mixer, optionally provided within vessel 14, mixes the fluid. For example, the mixer may comprise a planetary mixer, a double planetary mixer, or the like. Additional materials may also be added in stages. Accordingly, vessel 14 may or may not contain all of the ingredients of the first fluid. Moreover, in some embodiments, the first fluid may include two or more mixed fluids, with or without dispersed phases such as particles mixed in the fluids. Vessel 24 and pump 26 used to process the second fluid may be substantially similar to vessel 14 and pump 16 used to process the first fluid.
One or more intensifier pumps 20, 30 each may be capable of generating approximately 100 to 40,000 psi (690 kPa to 275 MPa) of fluid pressure. Fluid processing device 2, as described herein, may be capable of handling pressures greater than approximately 10,000 psi (68,950 kPa), greater than approximately 30,000 psi (207 MPa), or greater than approximately 40,000 psi (275 MPa). Intensifier pump 30 used with the second fluid may be substantially similar to intensifier pumps 20 used on the first fluid.
Following pressurization by intensifier pump 20, the first fluid flows through heat exchanger 22 to dissipate excess thermal energy generated by intensifier pump 20. Heat exchanger 32 used to dissipate excess thermal energy from the second fluid is substantially similar to heat exchanger 22. In other embodiments, heat exchangers 22 and 32 may increase the thermal energy in the first or second fluids. Alternatively, in some embodiments, heat exchangers 22 and 32 may be located downstream of annular fluid processing device 2. In a preferred embodiment, however, heat exchangers 22, 32 are located upstream of fluid processing device 2. Heat exchangers 22 and 32 may be suited for high pressure applications that may include pressures produced by intensifier pumps 20 and 30.
The first and second fluids are delivered to fluid processing device 2 after flowing through heat exchangers 22 and 32, respectively. Fluid processing device 2 generates shear and extension forces, producing energy dissipation to reduce the size of the particles in the first and second fluids. In other words, fluid processing device 2 serves to reduce the size of the dispersed phase in the first and second fluids, producing smaller-sized particles, and thereby producing a finely dispersed solution of particles having a desired size range. The first and second fluids are also combined into a final product, at output 34, at the same time that the dispersed phases from each fluid are reduced in size. In some embodiments, additional heat exchangers (not shown) may be used to extract excess thermal energy generated in the mixture during processing. However, additional heat exchangers may not be necessary in various applications.
An optional filtration element may be used to filter particles in the final combined product. For example, the filtration element may comprise one or more porous membranes, mesh screens, or the like, to filter the final combined product. The output of the filtration element may then be used, e.g., for coating, packaging or some other end use. In some cases, for example, the output may be packaged and sold, e.g., in the case of coatings, inks, paints, dyes, fertilizers, foods, beverages, pharmaceuticals, biological products, agricultural products, or the like. A back pressure regulator (not shown) may be added downstream of the filtration element to help maintain substantially constant pressure in system 10. In some embodiments, system 10 may provide a return path to a recovery vessel for any recovered or unused portion of the output 34, i.e., any portion not used in the applicable coating, packaging, or manufacturing process. Alternatively, the final combined product may be directed to another vessel (not shown) for storage or further fluid processing.
Fluid processing device 2 accepts multiple streams of fluids, and makes use of opposing, coaxial, annular fluid flow channels having different annular path areas. However, in some cases, the annular flow path areas may be equal in some embodiments. Fluid processing device 2 may include a flow path cylinder and a rod positioned inside the flow path cylinder. Each annular flow channel is defined by the outer diameter of the rod and the inner diameter of the flow path cylinder within each channel. Specifically, two annular flow channels flow toward one another through the cylinder (or cylinders), and meet within the cylinder, such as near the center of the cylinder. The opposing forces created by the collision of the fluids transmitted along the two different annular flow channels create shear forces. The fluid flows oppose one another within the cylinder. An outlet extends through the cylinder where the fluids flowing down the two annular flow channels collide, allowing the resulting combined product to be expelled through the outlet. The shear and extensional forces during the collision of the fluids causes a reduction in size of the dispersed phase prior to expulsion through the gap, e.g., producing particles of reduced size. Moreover, the annular flow channels may enhance wall shear forces in fluid processing device 2 by increasing surface area associated with a given flow channel.
The rod may be cylindrical, and can be positioned within the flow path cylinder to define the inner diameter of each annular, coaxial flow channel. In other words, the inner diameter of the one or more flow path cylinder defines an outer diameter of each respective annular flow channel, and the outer diameter of the cylindrical rod positioned inside the flow path cylinder defines the inner diameter of each annular flow channel. To create the different annular path areas of each annular flow channel, the outer diameter of the rod, the inner diameter of the flow path cylinder, or both, is different for each annular flow channel. In other words, the rod may be the combination of two cylinders of different outer diameters. Alternatively, the flow path cylinder may be the combination of two cylinders of different inner diameters. In some embodiments, the cylindrical rod may be free to move and vibrate within the flow path cylinder, which can provide an automatic anti-clogging action. In other embodiments, the cylindrical rod may be fixedly attached to a structure within processing device 2 to inhibit vibrations during fluid movement. Also, the outlet may be formed by an adjustable gap defined by two separate flow path cylinders positioned on a common axis in series, with the rod extending into both cylinders. In that case, the first and second fluids flow down the respective coaxial cylinders in opposing directions and meet at the adjustable gap defined by separation of the two separate flow path cylinders.
In particular, the inner diameter of flow path cylinder 56 defines an outer diameter of annular flow channels that feed toward one another to meet at the center of cylinder 56. Rod 54 is positioned inside flow path cylinder 56, and defines first and second ends. A first end of rod 54 extends into annular flow channel 62 and a second end of rod 54 extends into second annular flow channel 64. Ordinarily, rod 54 is concentric, with the annular flow channels 62, 64, having a center axis that is aligned with the central longitudinal axis of flow path cylinder 56. The outer diameter of rod 54 defines the inner diameter of each annular flow channels 62 and 64. Specifically, rod 54 has two different diameters. The diameter of rod end 54A within annular flow channel 62 is larger than the diameter of rod end 54B within annular flow channel 64. Rod end 54A meets rod end 54B at the step located at the end of annular flow channel 62; however, the location of the step in rod 54 may be located at another position along rod 54. Accordingly, flow channels 58 and 60 respectively feed into annular flow channels 62 and 64 defined by flow path cylinder 56 and rod 54. In some embodiments, the various flow paths and channels within device 4 may be machined using a common block of material. In other embodiments, rod end 54B may be larger than rod end 54A. Alternatively, flow path cylinder 56 may have different inner diameters along each annular flow channel 62 and 64, as described later in detail. In this case, rod 54 may or may not have two different diameters.
The first fluid flows along annular flow channel 62 with the smaller annular path area, e.g., from left to right in
The energy dissipation caused by the shear and extensional stresses and strains acting on the two fluids flowing along annular flow channels 62 and 64 may cause a reduction in size of the dispersed phase or phases. For example, agglomerates in each fluid may be broken up into smaller sized particles. Additionally, the first fluid and the second fluid are mixed, reacted or combined to form a newly combined final fluid product. Moreover, annular flow channels 62 and 64 may enhance wall shear forces in fluid processing device 4 by increasing surface area associated with flow channels 62 and 64. In this manner, fluid processing device 4 can be used to reduce the size dispersed phase, such as particles, in each of the two fluids.
The final fluid product is expelled through outlet 66 and exits fluid processing device 4 (as indicated at output 34). The annular flow path area of annular flow channel 62 is smaller than the annular flow path area of annular flow channel 64. This may be advantageous, for example, when the first fluid may have a lower density and/or smaller viscosity that allows the first fluid to flow at a higher flow rate than the second fluid with a higher density and/or viscosity in equal sized annular path areas. Therefore, the larger annular path area of annular flow channel 64 may allow the flow rate of the second fluid to equal the flow rate of the second fluid and provide an impingement site at the location of outlet 66.
As further shown in
Alternatively, the controller may adjust the pressure of one or both of intensifier pumps 20, 30. Similarly, the controller may receive temperature measurements, and cause adjustment of the temperature to one or more fluids, as needed, to maintain a desired input temperature for each fluid into fluid processing device 4. Precise measurement of flow pressures may be desirable for each of the first and second fluids to ensure the desired impingement energy dissipation from respective annular flow channels 62 and 64 because of possible differences in pressures due to the differences between the fluids and the annular path areas.
In some embodiments, temperature sensors 48 and 52 may be located at different positions within fluid processing device 4. For example, temperature sensors 48 and 52 may be located within channel separator 40 with sensor 48 measuring the temperature of flow channel 58 and sensor 52 measuring the temperature of flow channel 60. Alternatively, pressure sensors 46 and 50 may be located at other locations within fluid processing device 4.
Substantially identical flows of each fluid down their respective annular flow channels 62 and 64, e.g., in terms of pressure or temperature, are indicative of a non-clogged condition. Alternatively, consistent pressure or temperature measurements may indicate that no clogs are occurring within the processing device. Temperature monitoring, in particular, can be used to identify when a clogged condition occurs, and may be used to identify when anti-clogging measures should be taken, e.g., application of a pulsated short term pressure increase in one or both input flows to clear the clog. For example, monitor/control unit 18, 28 (
Gland nuts 42 and 44 may be used to secure flow path cylinder 56 in the proper location within fluid processing device 4. Moreover, gland nuts 42 and 44 can be formed with channels (indicated by the dotted lines) that allow fluid to flow freely through flow channels 58 and 60 and into annular flow channels 62 and 64.
Rod 54 may be cylindrically shaped (such being made up of two concentric cylinders of different diameters), although the disclosure is not necessarily limited in that respect. For example, other shapes of rod 54 may further enhance wall shear forces in the annular flow channels. Alternative shapes may include a circular cylinder, oval cylinder or polygon cylinder. In addition to rod 54 having two cylindrical diameters on rod ends 54A and 54B, the interface between each rod end may be a straight radial step, multiple steps, a straight slope, a curved slope, or any other surface that connects the two cylinder diameters of different sizes. Alternatively, rod ends 54A and 54B may be different sized cones or other shapes of varying diameter along the axis of rod 54.
Rod 54 may be free to move and vibrate within the flow path cylinder 56. In particular, rod 54 may be unsupported within flow path cylinder 56. Free movement of rod 54 relative to flow path cylinder 56 may provide an automatic anti-clogging action to fluid processing device 4. If dispersed phases, such as particles or agglomerations, in one or both of the fluids become clogged inside fluid processing device 4, e.g., at the edges of annular flow channels 62 or 64, rod 54 may respond to local pressure imbalances by moving or vibrating. For example, a clog within cylinder 56 or in proximity of annular flow channels 62 or 64 may result in a local pressure imbalance that causes rod 54 to move or vibrate. The movement and/or vibration of rod 54, in turn, may help to clear the clog and return the pressure balance within fluid processing device 4. In this manner, allowing rod 54 to be free to move and vibrate within the flow path cylinder 56 can facilitate automatic clog removal. In other embodiments, rod 54 may be fixed within fluid processing device 4.
To further improve clog removal, or permit clog removal when rod 54 is fixedly mounted, a pulsated short term pressure increase in the input flow at first input 36, second input 38, or both, can be performed upon identifying a clog. For example, as mentioned above, temperature sensors 48 or 52 may identify temperature changes in flow channels 58 and 60, which may be indicative of a clogged condition. In response, monitor/control unit 18 or 28 (
Alternatively, monitor/control units 18, 28 may control inlet valves associated with device 4 the first and second fluids to selectively increase or decrease pressure and thereby unclog device 4. A short term pressure increase may be particularly useful in clearing clogs that affect both annular flow channels 62 and 64. In that case, the temperature of both input flow paths may be similar, but may increase because of the clog that affects both annular flow channels 62 and 64.
In different embodiments, outlet 66 may have a fixed or adjustable size. For example, outlet 66 may take the form of a gap with an adjustable width. Flow path cylinder 56 and rod 54 may define substantially constant diameters, or one or both of flow path cylinder 56 and rod 54 may define diameters that vary or change along the annular flow channels 62 and 64. The components of fluid processing device 4, including flow path cylinder 56 and rod 54, may be formed of a hard durable metallic material such as steel or a carbide material. As one example, flow path cylinder 56 and rod 54 may be formed of tungsten carbide containing approximately six percent tungsten by weight.
Annular fluid processing device 68 does not include the channel separator 40 that is included in device 4. Blocks 70 and 72 separate flow paths 90 and 92 of fluid processing device 68. Blocks 70 and 72 are sealed together to create flow paths 90 and 92 and prevent the flow paths from ever merging. In some embodiments, blocks 70 and 72 are comprised of one continuous piece of material to eliminate the need for sealing two separate blocks.
Again, annular flow channels 62 and 64 are defined by flow path cylinder 56 and rod 54 such that the annular path area of annular flow channels 62 and 64 are different. Specifically, the annular path area of annular flow channel 62 is smaller than the annular path area of annular flow channel 64 in
The following dimensions are provided for purposes of illustration, and should not be considered limiting of the invention as broadly embodied and described herein. In an exemplary embodiment, the inner diameter of flow path cylinder 56 may be in the range of approximately 0.290 inches to 0.00290 inches (7.37 mm to 0.0737 mm). For example, the inner diameter of flow path cylinder 56 may be approximately 0.0290 inches (0.737 mm). The outer diameter of rod 54, either rod end 54A or 54B, may be in the range of approximately 0.270 inches to 0.00270 inches (6.86 mm to 0.0686 mm). The outer diameter of rod 54 at rod end 54A may be slightly smaller than the minimum inner diameter of flow path cylinder 56 with the outer diameter of rod 54 at rod end 54B smaller than rod end 54A. For example, if the inner diameter of flow path cylinder 56 is approximately 0.0290 inches (0.737 mm), the outer diameter of rod 54, at rod end 54A or rod end 54B, may be between approximately 0.0250 inches and 0.0280 inches (6.35 mm and 0.711 mm). Specifically, the outer diameter of rod 54 may be 0.0260, 0.0274, 0.0276, or 0.0278 inches (0.661, 0.696, 0.701, and 0.706 mm). Other sizes, widths and shapes of flow path cylinder 56 and rod 54 could also be used in accordance with the disclosure. While the radial step of rod 54 is shown to be located at the edge of annular flow channel 62, the radial step may be located anywhere within annular flow channel 62 or outlet 66. The exact location of the radial step of rod 54 during fluid processing device 4 operation may depend upon the pressures of the first and second fluid.
By way of example, the width of outlet 66 may be approximately between 0.0001 inches and 0.1 inches (0.00254 mm and 2.54 mm). As one example, the width of outlet 66 at the outer diameter of flow path cylinder 56 may be in a range of approximately 0.006 inches to 0.010 inches (0.152 mm to 0.254 mm). Outlet 66 may extend approximately 180 degrees around cylinder 56, or may extend to a lesser or greater extent, if desired. Other sizes and shapes of outlet 66 may also be used, particularly for different types of fluid processing applications.
Flow path cylinder 56 may define a minimum width that remains substantially constant along the annular flow channels. Rod 55 may be cylindrically shaped with rod end 55A having a larger diameter than rod end 55C. Rod end 55A meets rod end 55C at a straight slope 55B around the circumference of rod 55 to gradually connect the different diameters of rod ends 55A and 55B. Slope 55B of rod 55 may be located generally within outlet 66, but the slope may also be located at least partially within annular flow channel 62, annular flow channel 64, or both. In other embodiments, slope 55B may be a convex curve, a concave curve, an asymmetrical curve, or any other continuous shape that connects the diameters of rod ends 55A and 55B. In addition, slope 55B may lead to a radial step between the diameter of rod end 55A and slope 55B or slope 55B and the diameter of rod end 55C.
Slope 55B of rod 55 may prevent an abrupt surface for the first or second fluid to flow around when exiting outlet 66. In addition, slope 55B may cause rod 55 to be self-centering within flow path cylinder 56. Rod 55 may also be free to move and vibrate within the flow path cylinder 56. Ordinarily, rod 55 is concentric with the annular flow channels of different annular path areas, having a center axis that is aligned with the central longitudinal axis of flow path cylinder 56. Fluid dynamic forces and uniform balance of rod 55 can force the rod toward the lateral and longitudinal center of the annular flow channel. Movement and vibration of rod 55 within flow path cylinder 56 can facilitate automatic clog removal. The dimensions of rod 55 may be substantially similar to rod 54 of
Flow path cylinders 59 and 61 define different outer diameters for each respective annular flow channels 63 and 65. Specifically, the outer diameter of annular flow channel 63 is smaller than the outer diameter of annular flow channel 65 to create different annular path areas. Rod 57 may be cylindrically shaped to define a substantially constant inner diameter of annular flow channels 63 and 65. In other embodiments, rod 57 may be cylindrically shaped with different diameters within annular flow channels 63 and 65. Flow path cylinders 59 and 61 may meet at a step as shown in
Rod 57 may also be free to move and vibrate within the flow path cylinders 59 and 61. Ordinarily, rod 57 is concentric with the annular flow channels of different annular path areas, having a center axis that is aligned with the central longitudinal axes of both flow path cylinders 59 and 61. Fluid dynamic forces and uniform balance of rod 57 can force the rod toward the lateral and longitudinal center of the annular flow channel. Movement and vibration of rod 57 within flow path cylinders 59 and 61 can facilitate automatic clog removal. The dimensions of rod 57 and flow path cylinders 59 and 61 may be substantially similar to rod 54 and flow path cylinder 56 of
Rod supports 51 and 53 prevent rod 54 from moving or vibrating within flow path cylinder 56. Fixedly attaching rod 54 to rod supports 51 and 53 may be beneficial in some applications where fluid processing device 4 may be incorporated. For example, vibration of rod 54 may be unwanted if constant shear forces are desired at all times within flow path cylinder 56. If a clog occurs within flow path cylinder 56, short pulses of greater pressure from first input 36 or second input 38 may unclog any flow path, such as annular flow channels 62 or 64. Alternately, rod supports 51 and 53 may allow rod 54 to slightly move within flow path cylinder 56. This movement may be related to rod 54 flexing or pressure differences between the first and second fluids.
The outer diameter of annular flow channels 62 and 64 is defined by the inner diameter of two cylinders 100 and 102 positioned in series, with outlet 66 being defined as the lateral gap 66 between both cylinders 100 and 102. In that case, rod 54 extends inside each of the two cylinders 100 and 102 to define the inner diameter of the annular flow channels 62 and 64. In other words, rod end 54A of rod 54 defines an inner diameter of annular flow channel 62 and rod end 54B of rod 54 defines an inner diameter of annular flow channel 64.
Outlet 66 may be adjusted by moving one of cylinders 100 or 102 laterally relative to the other of cylinders 100 or 102. Gland nuts 42 and 44 may facilitate this gap adjustment. In particular, gland nuts 42 and 44 may include threading to facilitate translational movement of gland nuts 42 and 44 relative to one another to adjust the position of cylinders 100 and 102 relative to one another and thereby adjust the size of outlet 66.
In the configuration of
The outer diameter of annular flow channels 62 and 64 is defined by the inner diameter of two cylinders 100 and 102 positioned in series, with outlet 66 being defined as the lateral gap 66 between both cylinders 100 and 102. In that case, rod 55 extends inside each of the two cylinders 100 and 102 to define the inner diameter of the annular flow channels 62 and 64. In other words, rod end 55A of rod 55 defines an inner diameter of annular flow channel 62 and rod end 55C of rod 55 defines an inner diameter of annular flow channel 64. As each fluid exits their respective annular flow channels 62 and 64, the fluid mixes around slope SSB within outlet 66, which provides an interface between rod ends 55A and 55C.
The outer diameter of annular flow channels 63 and 65 is defined by the inner diameter of the two flow path cylinders 101 and 103 positioned in series, with outlet 66 being defined as the lateral gap 66 between both flow path cylinders 101 and 103. In that case, rod 57 extends inside each of the two cylinders 101 and 103 to define the inner diameter of annular flow channels 62 and 64. In other words, rod 57 defines a substantially constant inner diameter of both annular flow paths 63 and 65. However, flow path cylinder 101 has a smaller inner diameter than the larger inner diameter of flow path cylinder 103. In this manner, annular flow path 63 has a smaller annular path area than annular flow path 65. In some embodiments, flow path cylinder 103 may have a smaller inner diameter than flow path cylinder 101. In other embodiments, rod 57 may be replaced with either of rods 54 or 55 described herein to further change the annular path area of one or both of annular flow paths 63 and 65. In addition, rod 57 have an outer diameter that changes with axial position of rod 57 such that the annular path area of one or both of annular flow paths 63 and 65 may change with position within the respective flow paths. To this effect, alternative embodiments may also include flow path cylinders 101, 103 with changing inner diameters with position within the respective annular flow paths 63, 65.
Rod supports 71 and 73 prevent rod 54 from moving or vibrating within cylinders 100 and 102. Fixedly attaching rod 54 to rod supports 71 and 73 may be beneficial in some applications where fluid processing device 4 may be incorporated. For example, vibration of rod 54 may be unwanted if constant shear forces are desired at all times within cylinders 100 and 102. If a clog occurs within cylinder 56, short pulses of greater pressure from first input 36 or second input 38 may unclog any flow path, such as annular flow channels 62 or 64. Alternately, rod supports 71 and 73 may allow rod 54 to slightly move within cylinder 56. This movement may be related to rod 54 flexing or pressure differences between the first and second fluids.
Rod 54 is positioned inside flow path cylinder 56, thereby creating flow paths that have different annular path areas from the difference in outer diameter of rod end 54A and 54B. Rod 54 may have a length that is longer, shorter, or approximately the same length as flow path cylinder 56. Preferably, rod 54 may have a length that is longer than the length of flow path cylinder 56, but shorter than a distance between input nozzles (not shown) or gland nuts (not shown) through which the first or second fluids are introduced into flow path cylinder 56. Rod ends 54A and 54B may be substantially continuous throughout flow path cylinder 56 until they meet at a radial step at some position within or adjacent outlet 66.
In an alternative embodiment shown in
Moreover, annular flow channels may enhance wall shear forces in each flow path cylinder 59 and 61 by increasing surface area associated with the opposing flow paths. However, the wall shear forces in each flow path cylinder 59 and 61 may not be equivalent due to the difference in annular path area between each flow path cylinder 59 and 61. In some embodiments, the wall shear forces produced in the first and second fluid may be equivalent due to the differences between the first and second fluid density and viscosity and the annular path areas of each fluid. In alternative embodiments, outlet 66 may be formed in flow path cylinder 59 or in both flow path cylinders 59 and 61.
Rod 57 has a constant outer diameter and is positioned inside flow path cylinders 59 and 61, thereby creating flow paths that have different annular path areas from the difference in inner diameter of each flow path cylinder 59 and 61. Rod 57 may have a length that is longer, shorter, or approximately the same length as the combined length of flow path cylinders 59 and 61. Preferably, rod 57 may have a length that is longer than the length of combined flow path cylinders 59 and 61, but shorter than a distance between input nozzles (not shown) or gland nuts (not shown) through which the first or second fluids are introduced into flow path cylinder 56.
In an alternative embodiment shown in
Many embodiments of the disclosure have been described. Various modifications may be made without departing from the scope of the claims. For example, although the invention has been described in terms of application to industrial manufacturing of coatings, inks, paints, abrasive coatings, fertilizers, foods, beverages, pharmaceuticals, biological products, and agricultural products, the invention may be applicable to combination of any of a variety of fluids and/or materials to form dispersions, emulsions, suspensions, solutions, or the like. In addition, the invention may be applicable to combinations of two or more fluids having different compositions or substantially identical compositions. These and other embodiments are within the scope of the following claims.
