Patent Application
20240207775
This application claims benefit of priority of Korean Patent Application No. KR 10-2022-0180709, filed on Dec. 21, 2022, the contents of which are hereby incorporated by reference.
The present invention relates to a VOC adsorption-desorption apparatus for volatile organic compound condensing system, and more particularly, to a VOC adsorption-desorption apparatus for volatile organic compound condensing system capable of minimizing residual VOC remaining on a filter without falling after being pressurized with steam or nitrogen gas.
In general, volatile organic compounds (VOCs) are very harmful substances being generated from facilities using various organic solvents such as semiconductor facilities, petroleum refineries, petrochemical manufacturing facilities, gas stations, paint manufacturing facilities, laundry, printing and publishing facilities, road paving facilities, painting facilities, and the like. Therefore, the installation of facilities for the removal of VOCs is required in workplaces using organic solvents.
A facility for removing VOC adsorbs VOC using an adsorbent such as granular activated carbon and the adsorbed VOC is desorbed at a high concentration in the filter and then cooled to recover it in a liquid state, and such a facility is called a volatile organic compound condensing system.
At this time, the volatile organic compound condensing system generally includes two housings and two filters belonging thereto, in which an adsorption process for adsorbing VOCs is performed in one filter while a desorption process for desorbing adsorbed VOCs is performed in the other filter, and the adsorption process and the desorption process are performed alternately and repeatedly, thereby allowing the filter to be used for a long time.
Meanwhile, the desorption process allows VOCs adsorbed on the filter to be desorbed from the filter by the thermal fluid (high temperature steam or high temperature nitrogen gas) being supplied as high-temperature steam or high-temperature nitrogen gas are supplied from the upper direction of the adsorption and desorption unit toward the through hole.
However, since the desorption process of a general adsorption and desorption unit supplies high-temperature steam or high-temperature nitrogen gas from the upper side of the adsorption and desorption unit, the adsorption and desorption unit has a large supply power, so the adsorbed VOCs can easily fall, but as the amount of supply of the high-temperature steam or high-temperature nitrogen gas passing through the upper filter decreases as it travels toward the lower end of the adsorption and desorption unit, there is a problem in that residual VOCs remaining on the filter without falling even after the desorption process occur.
The present invention is invented for solving the above problems, and its purpose is to provide a VOC adsorption-desorption apparatus for volatile organic compound condensing system capable of minimizing residual VOCs remaining on the filter without falling off after supplying high-temperature steam or high-temperature nitrogen gas.
A VOC adsorption-desorption apparatus for volatile organic compound condensing system according to an aspect of the present invention for achieving the above object is characterized by comprising: an upper plate having a circular hole formed in the center of a circular plate; a lower plate having a diameter smaller than the outer diameter of the upper plate but larger than the diameter of the hole; a filter installed between the upper plate and the lower plate and around a through hole being extended from the hole of the upper plate toward the lower plate; and a filter protection net formed in the shape of a net and being extended from an outer circumference of the upper plate to an outer circumference of the lower plate to surround the filter.
Here, the filter is preferably installed inside an outer circumferential surface being formed by connecting an outer circumference of the upper plate and an outer circumference of the lower plate.
The through hole is formed in a shape in which the diameter of the hole of the upper plate is maintained the same from the upper plate to the lower plate.
In addition, the through hole may be formed in a shape in which the diameter of the hole of the upper plate gradually decreases from the upper plate to the lower plate.
According to the present invention, it is possible to minimize residual VOCs remaining on a filter without falling off after pressurizing thereof with high-temperature steam or high-temperature nitrogen gas.
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the Office upon request and payment of the necessary fee.
Hereinafter, some embodiments of the present invention will be described through exemplary drawings. In describing the reference numerals to the components of each drawing, for the same components, even if they are displayed on different drawings, they are indicated with the same reference numerals as much as possible. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function hinders understanding of the embodiment of the present invention the detailed description will be omitted.
In addition, terms such as first, second, A, B, (a), and (b) may be used in describing components of an embodiment of the present invention. These terms are only used to distinguish the component from other components, and the nature, order, or sequence of the corresponding component is not limited by the term. When a component is described as being “connected”, “coupled” or “interconnected” to another component, the component may be directly connected, coupled or interconnected to the other component, but it should be understood that another component may be “connected”, “coupled” or “interconnected” between the component and the other component.
Referring to
The adsorption-desorption unit 110 repeatedly performs an adsorption process of adsorbing volatile organic compounds from a supply gas and a desorption process of desorbing volatile organic compounds by supplying heating gas to the volatile organic compounds adsorbed by the adsorption process.
At this time, the adsorption-desorption unit 110 is provided in two A and B, and implemented in that when one adsorption-desorption unit 110 performs the desorption process A, the other adsorption-desorption unit 110 performs the adsorption process B. Such a desorption process and an adsorption process are alternately and repeatedly performed.
Hereinafter, a VOC removal process by the volatile organic compound condensation system 100 will be described.
Contaminated gas generated in the production line is sent to the blower 104 through the pre-filter 102, and the blower 104 sends the contaminated gas that has passed through the pre-filter 102 to the line of the adsorption-desorption unit 110.
At this time, a line opening-closing device 106 is installed in the line of each adsorption-desorption unit 110, and opening and closing of the line is controlled depending on whether the corresponding adsorption-desorption unit 110 performs a desorption process or an adsorption process.
That is, the line opening-closing device 106 on the A side responding to the desorption process closes the line directing the adsorption-desorption unit 110 on the A side, and the line opening-closing device 106 on the B side responding to the adsorption process opens the line directing the adsorption-desorption unit 110 on the B side, thereby allowing contaminated air to flow into the adsorption-desorption unit 110 on the B side.
At this time, each adsorption-desorption unit 110 includes an upper plate 10, a lower plate 20, a filter 30, and a filter protection net 40, as illustrated in
In the upper plate 10, a circular hole is formed in the center of a circular plate. In addition, the lower plate 20 is formed of a circular plate having the same diameter as the outer diameter of the upper plate 10. At this time, a through hole 12 being extended from the upper plate 10 to the lower plate 20 with the same diameter as the diameter of the hole of the upper plate 10 is formed, and a filter protection net 40 in the form of a net for protecting the filter 30 is installed between an outer circumference of the upper plate 10 and an outer circumference of the lower plate 20. Thus, the adsorption-desorption unit 110 has a cylindrical shape.
In addition, the adsorption-desorption unit 110 enables the filters 30 to be overlapped with each other in a zigzag form between the through hole 12 and the filter protection net 40. At this time, the shape in which the filters 30 are overlapped is the same as a horizontal cross-section illustrated in
In addition, each adsorption-desorption unit 110 may include a pressurization device 108 of high-temperature vapor or high-temperature nitrogen gas at an upper end of each filter 30. At this time, the pressurization device 108 on the B side corresponding to the adsorption process is opened, and VOCs in the polluted gas are condensed by an adsorbent such as granular activated carbon and filtered by the filter 30, thereby releasing clean gas to the atmosphere.
High-temperature steam or high-temperature nitrogen gas is introduced into the adsorption-desorption unit 110 responding to the desorption process on the B side, and the pressurization device 108 on the B side supplies high-temperature steam or high-temperature nitrogen gas to the through hole 12 of the adsorption-desorption unit 110 of the cylindrical shape. Accordingly, VOCs adsorbed by the filter 30 are desorbed from the filter 30, and the desorbed VOCs are transferred to the heat exchange unit 120, cooled by cooling water, condensed into a liquid state, and transferred to the separator 125. At this time, in the separator 125, layer separation is performed by a difference in specific gravity in a state in which liquid water and liquid VOC are mixed, and the gaseous low-concentration VOCs transported together are sent to the pre-filter 102 to undergo the above-described process again.
However, since the above-described desorption process by the adsorption-desorption unit 110 supplies high-temperature steam or high-temperature nitrogen gas from the upper side of the adsorption-desorption unit 110, the adsorbed VOCs can easily fall at an upper end of the adsorption-desorption unit 110 due to a large supply, but the supply volume of the high-temperature steam or high-temperature nitrogen gas passing through the upper filter decreases as it goes to the lower end of the adsorption-desorption unit, and thus, residual VOCs that do not fall off after the desorption process and remain on the filter may occur.
That is, as illustrated in
However, since the supply amount of high-temperature steam or high-temperature nitrogen gas decreases as it travels toward the lower end of the adsorption-desorption unit 110, VOCs adsorbed at the lower end may remain adsorbed without falling off.
In order to improve this problem, the adsorption-desorption unit 110 according to an embodiment of the present invention, as illustrated in
The filter 16 is installed between the upper plate 10 and the lower plate 14, and is installed around a through hole being extended from the hole of the upper plate 10 to the lower plate 14. At this time, the filter 16 is preferably installed inside the outer circumferential surface formed by connecting the outer circumference of the upper plate 10 and the outer circumference of the lower plate 14.
The filter protection net 18 is made in the shape of a net, and is installed to surround the filter 16 by being extended from the outer circumference of the upper plate 10 to the outer circumference of the lower plate 14.
Here, the through hole 12 may be formed in a shape in which the diameter of the hole of the upper plate 10 remains the same from the upper plate 10 to the lower plate 14, as illustrated in
Thus, in an adsorption-desorption unit 110 according to an embodiment of the present invention, as illustrated in
In addition, in an adsorption-desorption unit 110 according to another embodiment of the present invention, as illustrated in
As a result of confirming the flow characteristics of high-temperature steam or high-temperature nitrogen gas according to the shape change of the adsorption-desorption unit 110 using a computer analysis program, as illustrated in
Although the embodiments according to the present invention have been described above, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent embodiments are possible therefrom. Therefore, the protection scope of the present invention should be defined by the following claims as well as those equivalent thereto.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2022-0180709 | Dec 2022 | KR | national |
