Patent Grant
9194583
Burners are devices that burn fuel to generate heat in industrial settings, such as those used for generation of electricity, smelting of metals and other materials, and used for processing of chemicals and other substances. Due to incomplete combustion in previously designed burners, newer examples use generators inside the burner to create a vortex (i.e., rotating mixture of air and fuels) in order to supply more oxidants for the combustion process. While this accomplishes the goal of increased air-fuel mixture, an igniter is required for sustaining the combustion and this still may not accomplish complete in burning all of the fuel. Solutions that employ guide pieces and flow spaces (i.e., reactors) can also be used, but suffer from residue and cleaning difficulties, particularly when used with lower-quality fuels. Likewise, reactor solutions that employ a premix burner and a flame tube allow for staged combustion in individual mixers. However, these solutions also require high-quality, clean-burning fuels and suffer from maintenance issues resulting from residues.
According to embodiments of the present Application, a mixed-fuel vacuum burner-reactor includes a primary combustion chamber, an intake, a reduction nozzle, injectors, and a secondary combustion chamber. The primary combustion chamber has a conical interior and a first set of directing blades. The intake is connected to a first end of the conical interior. The reduction nozzle is connected to a second end of the conical interior. A first end of the reduction nozzle is connected to the conical interior of the primary combustion chamber and a second end of the reduction nozzle is connected to the secondary combustion chamber. The injectors are mounted perpendicularly to the reduction nozzle and configured to inject a second fuel into the primary combustion chamber. The second fuel is a liquid fuel, such as waste oil, alcohol (with up to 50% water added), Glycerin, soy oil, industrial fuel oil (IFO), or combinations thereof.
The primary combustion chamber is configured to enable two vortices of a first fuel entering and exiting the primary combustion chamber to form naturally, and the first set of directing blades is configured to create a third vortex sustaining rotation of the first fuel to the exterior of the burner-reactor. In some embodiments, the primary combustion chamber has an insulating material in a space between the cylindrical exterior and the conical interior. The secondary combustion chamber is cylindrical and comprises a second set of directing blades configured to direct air into the secondary combustion chamber.
In some embodiments, the mixed-fuel vacuum burner-reactor further includes an intake manifold connected to the intake portion. The intake manifold includes a vacuum chamber, a compressed air nozzle extending into the intake manifold, and an ejector outlet providing an outlet in some embodiments. According to some embodiments, the compressed air nozzle is configured to inject compressed air into the primary combustion chamber at the core of a flame. Gaseous fuel is supplied to the primary combustion chamber by way of the intake manifold in some embodiments. The gaseous fuel is natural gas, a water byproduct of water electrolysis (HHO), or combinations thereof. In some embodiments, the injectors are configured to inject fuel into the primary combustion chamber counter to the rotation of the vortices of fuel and/or are configured 30° to an axis of the chamber.
In other embodiments, a method of efficiently burning mixed fuels in a triple-vortex vacuum burner-reactor includes creating vacuum conditions in a conical primary combustion chamber by ejecting air through an intake manifold connected to the conical primary combustion chamber. The method continues by introducing fuels into the conical primary combustion chamber through the intake manifold, such that two vortices of a first set of fuels and outlet gases are formed. The method also includes passing the first set of fuels over a first set of directing blades in the conical primary combustion chamber to form a third vortex, the three vortices sustaining rotation through the conical combustion chamber and a secondary combustion chamber to the exterior of the burner-reactor. The method continues by injecting a second set of fuels into the conical primary combustion chamber in a direction opposite to a direction of rotation of the first set of fuels. In certain embodiments, the first set of fuels is gaseous fuels and the second set of fuels is liquid fuels.
The following drawings depict an exemplary embodiment of the invention.
The presently depicted and disclosed burner-reactor will be described with respect to an exemplary embodiment. The disclosure should not be interpreted to be limiting or to require in the invention all described features. Where possible, like elements will be numbered in a like fashion for clarity. Illustrative alternatives will be given where applicable, but other equivalents may be readily apparent and are contemplated where appropriate.
Primary combustion chamber 110 has a cylindrical exterior with a conical interior as will be described with reference to
At least in part because intake manifold 150 and primary combustion chamber 110 are configured to operate at vacuum conditions, high temperatures and easy, immediate thermal cracking can be achieved. Because of the vacuum conditions, the gases are drawn into the combustion chamber rather than being pushed into the chamber. This allows the burning of gases that become explosive while being compressed (such as HHO) and more efficient oxidation of heavier fuels. The vacuum conditions also enable specific thermal objectives, such as insulation of the primary combustion chamber and faster start-up of the burner-reactor than if vacuum conditions are not utilized.
During this stage of the combustion process, the fuels supplied into primary combustion chamber 110 from intake manifold 150 create two vortices of inlet and outlet gases naturally from the vacuum conditions. These naturally occurring vortices come about when the vacuum conditions cause the gas entering and exiting the chamber to rotate due to the pressure differences, similar to water entering or leaving in rapid fashion in fluid dynamics or as does air behind the wing of an aircraft.
While not necessary once operating, the primary combustion chamber is preheated using a small amount of fuel, such as HHO and natural gas. For example, 3 m3/hr of HHO and 16 m3/hr of natural gas can be used to preheat the chamber to approximately 2200 degrees for 20 minutes prior to introducing a second fuel into the system as described below. Once burner-reactor 100 has been preheated, the HHO can be removed without affecting performance. The HHO provides oxygen and a hydrogen laminar flow speed to the flame seven times faster than methane, thus allowing better cracking and combustion, and once again lowering the emissions.
Conical interior 220 has a first end 222 and a second end 224. First end 222 is the smaller end of the cone-shaped interior, and provides the entry point for the fuel gases and compressed air which enter from intake manifold 150. Primary combustion chamber 110 can include a threaded connection 226 at first end 222 for use with a counterpart connection of intake manifold 150 in order to introduce the fuels into the combustion chambers of the burner-reactor.
Intake manifold 150 and primary combustion chamber 110 should be connected in such a way that the associated vacuum chamber connected to the primary combustion chamber can create vacuum conditions for the gases to be sucked into primary combustion chamber 110. Compressed air is also fed into the core of the flame in primary combustion chamber 110, rather than sprayed and ignited as in many conventional burners. In some embodiments, primary combustion chamber 110 is made of a material such as insulated stainless steel, so as to eliminate adherence of combustion residues. The lack of obstructions as seen with typical reactor solutions also upgrades maintenance and reliability.
Injectors 140 on reduction nozzle 120 supply additional fuels to the already rotating fuels introduced on the opposite end of primary combustion chamber 110. The fuels injected by injectors 140 are supplied in a direction opposite the flow of the previously introduced fuels (i.e., the gaseous fuels supplied from the intake manifold 150). These fuels are fluids, and can be any quality of fuel available. For example, experimental data is given below showing the operation of the described embodiments on soy oil, waste oil, Glycerin, refined higher quality hydrocarbon fuels, as well as various mixtures of these fluids. Other liquid fuels include alcohol, which needs not be free of water. For example, alcohol with as much as 50% water included has been utilized with the described embodiments.
First portion 410 has injectors 140 mounted thereon which allow for the injection of the second set of fuels, i.e., the liquid fuels, into the primary chamber 110. Injectors 140 are mounted perpendicularly to the first portion 410. Where the first portion has an approximate 60° angle to horizontal on which the injectors are mounted, the injectors would be mounted to enter the primary chamber at an approximate 30° angle when viewed relative to a horizontal plane and in the opposite direction to the flow of the rotating gaseous fuels. Blades (shown but not numbered) are welded to the cylindrical second portion 420 of the reduction nozzle 120 at 45 degrees to the longitudinal axis. These blades will be described in greater detail below.
Because of the high temperatures and pressures generated by the described embodiments, injectors 140 are cooled. In some embodiments, injectors 140 are cooled by cooling nozzles (not shown or numbered). In some embodiments, cooling nozzles are part of an open circuit utilizing reduced compressed air or gas. For example, approximately 0.5 Kg/cm2 of compressed air or gas is used in an open circuit that drains inside the apparatus. In other embodiments, a closed oil and pump system is used. With such a closed system, the oil and pump simultaneously heats the service tank through a heat exchanger.
Regulating valves 650 provide controls for the air and gas flow into and out of the intake manifold 150. Because of the vacuum conditions, any type of combustible gas can be drawn into the combustion chambers and used in burner-reactor 100. Because of the triple vortex design, the gas mixture is more consistent regardless of the gas used, including heavier fuels, while the gas is recycled more efficiently within the combustion chambers.
As a result, previously undesirable gas fuels such as HHO can be utilized in combination with any liquid fuel, such as waste oil, Glycerin, and other fuels. This also allows for the mixture of higher-quality fuels with undesirable fuels, to reduce the amount of high-quality fuel used. Due to its capacity to burn any combination of combustible gases and liquids at the same time, its high working temperature, the injected compressed air, the vacuum and the delay in the transit of the flame through the combustion chambers due to its rotation, the described embodiments reduce the emissions and the price per KW of thermal power delivered compared with conventional energy converters. Use of the claimed embodiments also allow the proper disposal of waste oil from internal combustion engines, while residue metals contained in the waste oil condense to liquid and eventually to solid in the bottom of the second chamber.
Through the formation of the three vortexes, rotation of the fuels can be maintained throughout the combustion chambers and transit of the fuels is slowed. The slower transit of the fuels leads to more complete combustion. This slower combustion cycle, in turn, promotes more complete burning, which permits burner-reactor 100 to use any combination of gaseous and liquid fuels. Lower quality fuels, such as glycerin, waste oil, or combinations of the two, can be substituted for fuels that typically burn cleaner, such as industrial fuel oil (IFO) 380 or biodiesel. In addition, fewer emissions are generated, thus resulting in more environmentally friendly heat generation. Residues and maintenance problems are reduced or eliminated, and steady reliable heat can be generated.
Experimental data of output obtained by the triple vortex burner of the present disclosure is shown in Table 1 above. Table 1 shows the cost per Kilowatt/hour of thermal power obtained from the internal combustion of glycerin and/or waste oil from engines, which is reduced from 28% to 66% compared to the cheapest industrial fossil fuel (i.e., industrial fuel oil (IFO) 380).
The above described embodiments and related experimental data provide examples of the inventive concepts of the present disclosure. Alternative embodiments include modification of the vacuum chamber and regulating valves in order to introduce solid fuels into the primary combustion chamber instead or, or in addition to, the disclosed gaseous fuels. For example, adaptation can be performed to supply carbon powder or the like from the vacuum side of the combustion chamber. This solid fuel can be mixed with gaseous and/or liquid fuels to provide a different mixture of fuels in this embodiment.
The aforementioned descriptions provide sufficient detail to allow one of ordinary skill in the art to make and use the disclosed embodiments. However, other alternative embodiments may be readily apparent given the descriptions above. Equivalents are contemplated within the spirit and scope of the present disclosure. Therefore, the subject matter of the instant disclosure should be understood to fall within the limits of the claims that follow.
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| Number | Date | Country | |
|---|---|---|---|
| 20140234787 A1 | Aug 2014 | US |
