KR20050107323A - Catalystic combustion system of concentration by adsorption and desorption by counter-flow heating air - Google Patents

Abstract

The present invention relates to a process of adsorbing volatile organic compounds such as organic solvents generated in the coating booth to the fibrous activated carbon filter layer during the coating and drying process, concentrating and desorbing them after completion of the work, thereby making them harmless through catalytic oxidation.

In order to achieve the above object, the present invention can save energy by reusing hot air by catalytic oxidation in a desorption process, desorbs the fibrous activated carbon filter layer by backflow, and maintains a constant temperature of the hot air used in the desorption process. Program the temperature increase rate up to 150 ℃ to adjust the desorption temperature to prevent desorption due to high concentration desorption, and use the adsorption damper and desorption damper to avoid passing through the pretreatment layer filter during desorption. The adhered foreign matter was transferred to the catalyst layer so as not to reduce the life of the catalyst. Adsorption concentration and desorption efficiency are improved through the process as described above, which releases clean air into the atmosphere, resulting in an excellent air pollution purification effect.

Description

Catalytic Combustion System of Concentration by Adsorption and Desorption by Counter-flow Heating Air}

The present invention relates to a process of adsorbing volatile organic compounds such as organic solvents generated in the coating booth by adsorption and concentration in an adsorbent during the coating and drying process, and then desorbing after completion of work to detoxify through catalytic oxidation.

Conventional adsorption and desorption regeneration devices have the same desorption direction and desorption direction, so desorption is not performed properly, resulting in a problem of low efficiency. Adsorption and desorption cannot be performed efficiently by using granular type activated carbon as an adsorbent. They had the disadvantages of being thermally stored when they were attached and detached, which included the risk of fire.

In order to solve the problems as described above, the present invention is the adsorption concentration of volatile organic compounds of high air volume and low concentration during the coating and drying process to desorption catalytic oxidation by desorption by backflow type after the end of the work to absorb the hot air generated in this process It is an object of the present invention to provide an efficient adsorption concentration, backflow, and hot air desorption catalytic oxidation apparatus by saving energy by transferring to a concentrated fibrous activated carbon filter layer.

The present invention for achieving the above object to control the adsorption concentration and desorption by using the adsorption damper 22 and the desorption damper 23 according to the painting and drying process and the desorption process, harmless harmless after the volatile organic compound desorption The gas is used in the desorption process by adjusting the amount of hot air gas heated by the control of a valve interlocked by a temperature sensor, and by controlling the desorption temperature from room temperature to 150 ° C by using the amount of hot air gas by catalytic oxidation It is characterized by the invention that the organic compound is desorbed.

Hereinafter, the adsorption concentration and backflow type, hot air type desorption catalyst oxidizing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a layout view of adsorption concentration and backflow type, hot air desorption catalytic oxidation apparatus according to the present invention, Figure 2 is a flow chart of adsorption concentration in the fibrous activated carbon filter 24 during the coating and drying process, Figure 3 After the completion of the drying process, the concentrated volatile organic compound in the fibrous activated carbon filter 24 is desorbed and oxidized and removed in the catalyst layer 33.

1 to 3, the present invention is an exhaust fan 11 for transferring volatile organic compounds in the coating booth 10 to the adsorption tower, and a circulating fan for desorbing the concentrated sorbed volatile organic compounds to the catalytic oxidation tower. 12, control panel 13 for controlling the adsorption damper and desorption damper, oxidation temperature, desorption temperature, variable damper, etc., adsorption tower 20, pretreatment filter 21 for removing foreign matter, adsorption damper 22, desorption damper (23), fibrous activated carbon filter layer (24), temperature sensors (25, 32) and catalyst layer (33), heating device (31), catalyst tower (30), variable damper (34), and the like. Here, the control panel 13 controls the opening and closing of the adsorption damper 22, the desorption damper 23, and the variable damper 34 in the adsorption and desorption process as described below, and the desorption bed temperature sensor 25 and the catalyst bed temperature. The desorption temperature of the adsorption tower 20 and the oxidation temperature of the catalyst tower 30 are controlled according to the temperature sensed by the sensor 32.

In Figure 2, during the painting and drying process, the adsorption damper 22 in the adsorption tower 20 is opened and the desorption damper 23 is closed, so that volatile organic compounds generated from the coating booth enter the adsorption tower 20 through the exhaust fan 11 and are pretreated. Aerosols or impurities are filtered out of the filter 21, adsorbed by the fibrous activated carbon filter layer 24, and only clean air is discharged to the outside.

3 shows the process of desorption and regeneration of the volatile organic compounds adsorbed on the fibrous activated carbon filter layer 24 after the coating and drying operations are completed. The adsorption damper 22 is closed and the desorption damper 23 is opened while the desorption regeneration process is in progress. Meanwhile, in the catalyst bed temperature sensor 32, the temperature of the catalyst bed is maintained between 280 and 320 ° C., and when the temperature is lower than this temperature, the heating device 31 is operated. When the temperature is higher than the temperature, the heating device 31 is stopped. The desorption layer temperature sensor 25 measures the temperature of the air so that the temperature of the desorption air is maintained at 150 ° C. at room temperature, and the variable damper 34 is operated so that the desorption layer temperature sensor is 150 ° C. or lower by the desorption temperature program. By controlling the amount of hot air harmless in the catalyst layer is sent to the fibrous activated carbon filter layer (24). At this time, the air flow is circulated by the circulation fan 12 in the direction of (41)-> (42)-> (43)-> (44)-> (45)-> (46), and the variable damper 34 The hot air, which is harmless in the catalyst layer by the control of, is circulated in part (41) and part is discharged in (47), and clean outside air is introduced in the (48) direction for temperature control. Such temperature control and variable damper control are automatically or manually controlled by the control panel 13.

By repeatedly performing adsorption, desorption and regeneration, volatile organic compounds are efficiently adsorbed and concentrated, and desorption is carried out by a temperature rising program using hot air during catalytic combustion in a counter-flow type to efficiently detoxify through catalytic oxidation. . The temperature increase program is a temperature sensor to increase the desorption temperature from room temperature to 150 ℃ for 20 to 30 minutes, it is characterized in that it is controlled to be detached at a uniform concentration by maintaining at 150 ℃ for 20 to 30 minutes, after the desorption complete Closing (34) and passing the clean air at room temperature in the (48) direction for 10 minutes through the fibrous activated carbon filter layer 24 cools the temperature of the fibrous activated carbon filter layer so that it can enter the resorption process quickly.

Looking at the effects of the adsorption concentration and backflow type, hot air type desorption catalyst oxidizing apparatus according to the present invention, the hot air by catalytic oxidation can be reused in the desorption process to save energy, and the fibrous activated carbon filter layer by the back air type Desorption, by controlling the desorption temperature by programming the temperature increase rate up to 150 ℃ to desorption the temperature of the hot air used in the desorption process to a certain concentration to prevent the possibility of explosion due to temporary high concentration desorption, using the adsorption damper and desorption damper In order not to pass through the pretreatment layer filter, foreign substances adhering to the pretreatment layer were transferred to the catalyst layer so as not to reduce the life of the catalyst. Adsorption concentration and desorption efficiency are improved through the process as described above, which releases clean air into the atmosphere, resulting in an excellent air pollution purification effect.

1 is a layout view of adsorption concentration and backflow type, hot air type, and desorption catalytic oxidation apparatus according to the present invention.

2 is a flow chart of adsorption concentration in the fibrous activated carbon filter layer 24 during the coating process.

FIG. 3 is a flow chart of desorbing and removing volatile organic compounds adsorbed and concentrated on the fibrous activated carbon filter layer 24 during the desorption process and oxidizing and removing them from the catalyst layer 33

* Symbol description for main parts of drawing *

10: paint booth

11: exhaust fan

12: circulation fan

13: control panel

20: adsorption tower

21: pretreatment filter

22: adsorption damper

23: removable damper

24: adsorption layer (fibrous activated carbon filter layer)

25: temperature sensor

30: catalyst tower

31: heating device

32: temperature sensor

33: catalyst layer

34: variable damper

41: Piping between the catalyst layer and the fibrous activated carbon filter layer

42: space of the temperature sensor 25 position

43: space between the fibrous activated carbon filter layer and the adsorption damper

44: piping between the removable damper and the circulation fan

45: space between the catalyst bed and the variable damper

46: space between variable damper and catalyst bed outlet

47: piping between the variable damper and the catalyst bed outlet

48: piping between the adsorption layer outlet and the temperature sensor 25

Claims (5)

The present invention relates to a device for removing volatile organic compounds, An exhaust fan 11 configured to discharge polluting gas including volatile organic compounds in the paint booth; A pretreatment filter 21 receiving the pollutant gas from the exhaust fan 11 to remove foreign substances, an activated carbon filter layer 24 connected to a rear end of the pretreatment filter 21 to adsorb the volatile organic compound, and Adsorption damper 22 opened during the adsorption process of activated carbon filter layer 24 and closed during the desorption process, desorption damper 23 closed during the adsorption process of activated carbon filter layer 24 and opened during the desorption process, and the activated carbon filter layer 24 Adsorption tower 20 comprising a desorption bed temperature sensor 25 for measuring the temperature of the; A circulation fan 12 connected to an outlet of the desorption damper 23 for circulating the activated carbon filter layer 24 to circulate air desorbed from the activated carbon filter layer 24; The heating device 31 for heating the air circulated from the circulation fan 12, the catalyst layer 33 for catalytic oxidation of volatile organic compounds in the air heated in the heating device 31, and the catalyst layer 33 Catalyst tower 30 comprising a catalyst bed temperature sensor 32 for measuring the temperature; And Control panel 13 for controlling the opening and closing of the adsorption damper 22, the removable damper 23 Adsorption concentration and backflow, hot air type desorption catalytic oxidation apparatus comprising a. The method of claim 1, When the adsorption process of the activated carbon filter layer 24 proceeds, the adsorption damper 22 is opened and the desorption damper 23 is closed, so that the pollutant gas in the coating booth passes through the pretreatment filter 12 and the activated carbon filter layer 24. When the activated carbon filter layer 24 is desorbed and regenerated, the adsorption damper 22 is closed and the desorption damper is opened so that air for desorption and regeneration is activated carbon filter layer 24 and the circulation fan 12. After passing through the heating apparatus 31 and the catalyst layer 33, the flow is controlled to prevent foreign substances attached to the pretreatment filter 12 from being desorbed and affecting the catalyst layer 33. Adsorption concentration, backflow type, hot air type desorption catalytic oxidation apparatus. The method of claim 1, An upper portion of the catalyst tower 30 is provided with a variable damper 34 that controls to discharge the air passing through the catalyst tower 30 to the outside or to the upper portion of the adsorption tower 20, the variable damper 34 Part of the hot air that is harmless in the catalyst layer 33 is circulated toward the activated carbon filter layer 24, and part of the hot air is discharged to the outside, and the temperature of the air flowing into the activated carbon filter layer 24 is controlled. In order to control the temperature of the hot air used for desorption by controlling the variable damper 34 by the control panel 13 so that the clean outside air flows into the activated carbon filter layer 24, the adsorption concentration and backflow type , Hot air desorption catalytic oxidizer. The method of claim 1, The desorption layer temperature sensor 25 to increase the desorption temperature from room temperature to 150 ℃ for 20 to 30 minutes, maintaining the temperature at 150 ℃ 20 to 30 minutes to control the activated carbon filter layer 24 to be desorbed at a uniform concentration. Adsorption concentration and backflow type, hot air type desorption catalytic oxidation apparatus. The method of claim 1, Adsorption concentration and backflow type, hot air desorption catalytic oxidation apparatus, characterized in that the activated carbon filter layer (24) using fibrous activated carbon.