CN203990301U - Volatile organic compound processing device - Google Patents

Abstract

A volatile organic compound (VOC) treatment device includes at least two absorption/desorption towers, an exhaust gas supply pipeline, a post-adsorption gas exhaust pipeline, and a catalyst oxidation treatment unit. The exhaust gas supply pipeline is alternately connected to the absorption/desorption towers to allow the absorption/desorption towers to perform adsorption operations. The catalyst oxidation treatment unit is also alternately connected to the absorption/desorption towers to perform desorption operations. The exhaust gas supply pipeline and the catalyst oxidation treatment unit are not simultaneously connected to the same absorption/desorption tower. The catalyst oxidation treatment unit includes a heat exchanger, a catalyst reactor, an air intake unit, and an exhaust unit. The utility model can effectively remove VOCs in exhaust gas by matching the absorption/desorption towers and the catalyst oxidation treatment unit, and has the advantages of low construction cost, easy operation and maintenance, etc.

Description

Volatile Organic Compound Treatment Unit

technical field

The utility model relates to a waste gas treatment device, in particular to a volatile organic compound treatment device.

Background technique

The tail gas or indoor space emitted by factories often contains volatile organic compounds (hereinafter referred to as VOC), which are likely to cause harm to the environment and human body, so corresponding treatment must be implemented to reduce its content.

The scrubber is a common VOC treatment device. It is removed from the gas phase by dissolving VOC in the liquid phase. The scrubbing liquid used is usually water. Therefore, the VOC suitable for scrubber treatment must have a high solubility in water. , so non-water-soluble VOCs are not suitable for treatment with scrubbers. In addition, the use of scrubbers to treat VOC is bound to be accompanied by the generation of VOC-containing wastewater, and the wastewater also needs to undergo additional treatment procedures and generate wastewater treatment costs. If the wastewater is discharged outside without proper treatment, the VOC in the wastewater will still increase. Escaping naturally produces a foul odor.

VOC can also be treated by biological methods, that is, the digestion of microorganisms is used to decompose VOCs. However, biological methods occupy a large area and require more time for microbial cultivation, so the construction time is longer. In order for microorganisms to efficiently decompose VOC, the temperature and humidity of their growth environment must be controlled, which is difficult to maintain. In addition, because it takes a long time to treat VOC with biological methods, allowing microorganisms to have enough time to digest VOCs, biological methods are generally not suitable for large-scale waste gas treatment.

In the past, some people used concentrating rotors to treat VOC, but due to the high construction cost of concentrating rotors, they are generally not favored by manufacturers, and if the VOC concentration in the factory exhaust fluctuates greatly, the concentrating rotor with a fixed speed will not be effective To deal with VOC, if you want to adjust the speed of the enrichment wheel, the difficulty of control will increase, and other variables will also occur in the operation. For example, when the concentration of VOC in the factory tail gas suddenly increases, although the speed of the enrichment wheel can be increased to accelerate the adsorption of VOC, but the increase in speed also shortens the desorption time of the concentration wheel, resulting in the VOC after adsorption cannot be absorbed. Real-time desorption, thereby reducing the subsequent adsorption performance of the concentration wheel.

In the past, there was a VOC treatment method that used an absorption/desorption tower with steam condensation recovery, that is, the absorption/desorption tower was first used for adsorption, and after saturation, the adsorption/desorption tower was used for desorption with water vapor, so that VOC was The water vapor is carried away from the absorption/desorption tower, and then condensed to separate the VOC from the condensed water, so that the VOC can be recycled. This vapor condensation recovery method is suitable for high-concentration, single-component VOC treatment operations, but it has several disadvantages:

(1) A large amount of water vapor and ice water required for condensation are used during desorption, so it consumes a lot of energy;

(2) It is not suitable for waste gas treatment containing various VOCs, because after condensation, it is necessary to separate various VOCs, which is difficult;

(3) It is not suitable for the treatment of low-concentration VOC, because the benefits of recovery are obviously not proportional to the cost of energy consumed;

(4) The condensation efficiency is not high, and the condensed gas also contains VOC, and the condensed water also contains VOC.

In view of the fact that currently known VOC processing devices still have many shortcomings in practicality, how to provide a processing device with low construction and maintenance costs and capable of effectively processing VOC is really worthy of consideration by those skilled in the art.

Utility model content

The purpose of this utility model is to provide a low construction and maintenance cost and can effectively deal with volatile organic compound treatment device

In order to achieve the above object, the volatile organic compound processing device provided by the utility model includes at least two absorption/desorption towers, a waste gas supply pipeline, a gas discharge pipeline after adsorption and a catalyst oxidation treatment unit, each of which absorbs The/desorption tower has an inlet port and an exhaust port, and the exhaust gas supply pipeline is alternately connected to the inlet ports of the adsorption/desorption towers, so that the adsorption/desorption towers perform adsorption operations, and the adsorption The rear gas discharge pipeline is connected to the exhaust end of the absorption/desorption tower connected with the exhaust gas supply pipeline. The catalytic oxidation treatment unit is alternately connected to the absorption/desorption towers for desorption operation. The exhaust gas The supply pipeline and the catalyst oxidation treatment unit are not connected to the same absorption/desorption tower at the same time, and the catalyst oxidation treatment unit includes a heat exchanger, a catalyst reactor, an air intake unit, an exhaust unit, an A first pipeline, a second pipeline, a third pipeline and a fourth pipeline, the heat exchanger has a cold air passage and a hot air passage, an air inlet of the cold air passage is provided by the first pipeline It communicates with the exhaust end of the absorption/desorption tower connected to the catalyst oxidation treatment unit, and an exhaust port of the cold air channel is communicated with an air inlet of the catalyst reactor by the second pipeline, and the catalyst reacts An exhaust port of the device is communicated with an air inlet of the hot gas channel through the third pipeline, and an exhaust port of the hot gas channel is communicated with the suction/extractor of the catalytic oxidation treatment unit through the fourth pipeline. The inlet end of the attached tower is connected, the inlet unit is connected to the first or second pipeline for the oxidation gas required for introduction into the catalytic reactor, and the exhaust unit is connected to the fourth pipeline for the discharge pipeline part of the gas.

According to the aforementioned design, the VOC-containing waste gas can be adsorbed and removed by the absorption/desorption tower. When the adsorption is saturated, the catalyst oxidation treatment unit can be used to perform desorption on the absorption/desorption tower. In the utility model, the catalyst oxidation treatment unit uses the catalyst reactor to oxidize VOC into harmless compounds such as water and carbon dioxide. Since the oxidation is an exothermic reaction, the gas treated by the catalyst reactor can also be treated by the heat exchanger. The desorption gas transported by the first pipeline is preheated, thereby reducing or eliminating the need to additionally supply heat energy of the desorption gas, and reducing energy consumption. Overall, the VOC treatment device of the present invention has the advantages of low construction cost, low energy consumption, easy maintenance and high treatment efficiency, and can be used to treat waste gas of various concentrations, and can also treat waste gas containing multiple VOCs at the same time , so the utility model can really make up for the deficiencies of known VOC treatment devices.

Description of drawings

Fig. 1 is a schematic diagram of the composition of the processing equipment of the first embodiment of the present invention.

Fig. 2 is a schematic diagram of the composition of the processing equipment of the second embodiment of the present invention.

Explanation of main component symbols in the attached drawings:

Absorption/desorption towers 10a, 10b; inlet ports 11a, 11b; exhaust ports 12a, 12b; exhaust gas supply pipeline 20; control valves 21, 22; post-adsorption gas discharge pipeline 30; adsorption windmill 35; catalyst oxidation treatment Unit 40; first pipeline 41; control valves 411, 412; second pipeline 42; third pipeline 43; fourth pipeline 44; control valves 441, 442; heat exchanger 50; cold air channel 51; air intake Port 511; exhaust port 512; hot gas channel 52; air inlet 521; exhaust port 522; catalyst reactor 60; air inlet 61; exhaust port 62; air inlet unit 70; exhaust unit 80; desorption windmill 90; heater 100; oxidizing gas sensor 110; controller 120; sprinkler 130; temperature sensors 140, 140a, 140b.

Detailed ways

Please refer to Fig. 1, in the first embodiment of the present utility model, a kind of VOC treatment device comprises two absorption/desorption towers 10a, 10b, a waste gas supply pipeline 20, a gas discharge pipeline 30 and a catalyst after an adsorption Oxidation treatment unit 40.

Each of the absorption/desorption towers 10a, 10b has an inlet port 11a, 11b and an exhaust port 12a, 12b. The interior of the adsorption towers 10a, 10b is filled with adsorbent materials that can adsorb VOC. The selection of the adsorbent materials depends on the needs. Depending on the VOC to be treated, common adsorbent materials include but are not limited to activated carbon and zeolite.

The waste gas supply pipeline 20 is alternately communicated with the intake ends 11a, 11b of the absorption/desorption towers 10a, 10b, and the waste gas supply pipeline 20 is used to guide the waste gas containing VOC, so that the absorption/desorption tower 10a, 10b carry out the adsorption operation, the "adsorption operation" refers to the process of VOC being adsorbed by the adsorption material, and the "alternately communicated with the intake ends of these absorption/desorption towers" refers to the waste gas supply pipeline connected to After a period of time at the inlet of one part of the absorption/desorption tower, it will be switched to connect to the inlet of another part of the absorption/desorption tower for a period of time. For example, the exhaust gas supply pipeline 20 is first communicated with the intake port 11a of the absorption/desorption tower 10a, and when the absorption/desorption tower 10a is about to or has reached adsorption saturation, the exhaust gas supply pipeline 20 is changed to communicate with the suction terminal 10a through switching. At the inlet port 11b of the adsorption/desorption tower 10b, when the adsorption/desorption tower 10b is about to or has reached adsorption saturation, the exhaust gas supply pipeline 20 is switched and communicated with the adsorption tower 10a. The exhaust gas supply pipeline 20 may have several control valves 21, 22 to switch the connected absorption/desorption towers 10a, 10b.

This adsorbed gas discharge pipeline 30 is communicated with the exhaust ends 12a, 12b of the absorption/desorption towers 10a, 10b communicating with the exhaust gas supply pipeline 20, in other words, the exhaust gas supply pipeline 20 is connected with the exhaust gas after adsorption. The pipeline 30 is connected to the same absorption/desorption towers 10a, 10b, the former is connected to the inlet ports 11a, 11b, and the latter is connected to the exhaust ports 12a, 12b. After adsorption, the waste gas discharged from the gas discharge pipeline 30 has been It contains almost no VOC and can be discharged directly to the outside. In order to guide the exhaust gas from the exhaust gas supply pipeline 20 to the adsorbed gas discharge pipeline 30 via the adsorption/desorption towers 10a, 10b, an adsorption windmill 35 can be arranged on the adsorbed gas discharge pipeline 30 .

The catalyst oxidation treatment unit 40 is alternately connected to the absorption/desorption towers 10a, 10b for desorption operation, and the exhaust gas supply pipeline 20 and the catalyst oxidation treatment unit 40 are not connected to the same absorption/desorption tower at the same time. The towers 10a, 10b, that is, the single adsorption/desorption towers 10a, 10b do not perform adsorption and desorption operations at the same time. The "desorption operation" refers to the process of desorbing and removing VOC from the adsorption material.

The catalyst oxidation treatment unit 40 includes a heat exchanger 50, a catalyst reactor 60, an air intake unit 70, an exhaust unit 80, a first pipeline 41, a second pipeline 42, and a third pipeline 43 and a fourth pipeline 44, the heat exchanger 50 has a cold air passage 51 and a hot air passage 52, the two are not connected to each other, the gas in the cold air passage 51 can exchange heat with the gas in the hot air passage 52, and the cold air The paths of the channel 51 and the hot gas channel 52 are not limited to those shown in the figure.

An air inlet 511 of the cold air channel 51 is communicated with the exhaust ends 12a, 12b of the adsorption/desorption towers 10a, 10b connected to the catalyst oxidation treatment unit 40 by the first pipeline 41, and the first pipeline 41 A plurality of control valves 411, 412 may be provided to switch the connected absorption/desorption towers 10a, 10b. An exhaust port 512 of the cold air channel 51 is connected to an inlet of the catalyst reactor 60 by the second pipeline 42. Gas port 61 communicates, and catalyst reactor 60 inside has the catalyst material that can promote VOC oxidation, and the catalyst material selected for use depends on VOC kind and decides, and an exhaust port 62 of catalyst reactor 60 is connected with this third pipeline 43 An air inlet 521 of the hot gas channel 52 communicates with an exhaust port 522 of the hot gas channel 52, which is connected to the intake air of the absorption/desorption towers 10a, 10b of the catalyst oxidation treatment unit 40 through the fourth pipeline 44 The ends 11a, 11b are connected, and the fourth pipeline 44 may have several control valves 441, 442 to switch the connected absorption/desorption towers 10a, 10b. In order to allow the gas to flow in the pipeline, the catalyst oxidation treatment unit 40 can also include a desorption windmill 90 arranged in one of the first to fourth pipelines 41-44, in this embodiment it is arranged in the first Line 41. Both the adsorption and desorption windmills 35 and 90 are used to provide the required pressure difference for gas flow.

The air intake unit 70 is connected to the first pipeline 41 for introducing the oxidizing gas required for the catalytic reactor 60. The "oxidizing gas" refers to a gaseous oxidant that can perform a redox reaction with VOC, such as oxygen, and the intake air The oxidizing gas introduced by the unit 70 is not necessarily a pure oxidizing gas, but may also be a mixed gas containing an oxidizing gas, such as air. The exhaust unit 80 is connected to the fourth pipeline 44 to discharge a small amount of gas in the pipeline, and the remaining gas is continuously circulated to the adsorption/desorption towers 10a and 10b through the fourth pipeline 44 for desorption.

During operation, the exhaust gas supply pipeline 20 will introduce the VOC-containing exhaust gas into one of the absorption/desorption towers (take the absorption/desorption tower 10a as an example) for adsorption operation, and the exhaust gas after adsorption treatment will be directly discharged from the adsorbed gas discharge pipeline 30. discharge or carry out follow-up treatment, when the absorption/desorption tower 10a is about to or has reached adsorption saturation, the waste gas supply pipeline 20 changes the VOC-containing waste gas into another absorption/desorption tower 10b to continue the desorption operation, and the absorption/desorption The adsorption tower 10a is changed to communicate with the catalyst oxidation treatment unit 40 and carry out the desorption operation. At this time, the desorption gas in the pipeline of the catalyst oxidation treatment unit 40 will remove the VOC adsorbed by the absorption/desorption tower 10a, and the desorption containing VOC The gas is introduced into the cold air channel 51 of the heat exchanger 50 through the first pipeline 41, and at the same time, the air intake unit 70 supplements the oxidizing gas into the VOC-containing desorbed gas, and the VOC-containing desorbed gas passes through the second pipe after being preheated by the heat exchanger 50. The road 42 is introduced into the catalyst reactor 60, and VOC is converted into harmless compounds such as carbon dioxide and water after being oxidized by the catalyst, and the gas treated by the catalyst is then introduced into the hot gas channel 52 of the heat exchanger 50 through the third pipeline 43. The high-heat gas exchanges heat energy to the VOC-containing desorbed gas in the cold air channel 51, and then a small part of the gas is discharged through the exhaust unit 80, and the rest of the gas continues to circulate as desorbed gas through the fourth pipeline 44 to the adsorption/desorption tower 10a Perform detachment work. When the absorption/desorption tower 10b is saturated, switch again to make the absorption/desorption tower 10a resume the adsorption operation, while the absorption/desorption tower 10b is changed to perform the desorption operation. As a result, the adsorption/desorption towers 10a, 10b alternately switch between the adsorption operation and the desorption operation. Most of the gas after treatment is discharged from the gas discharge pipeline 30 after adsorption, and a small part is discharged from the exhaust unit 80. can be efficiently removed in processing plants.

Based on the aforementioned design, the construction cost of the absorption/desorption tower and catalyst oxidation treatment unit of the present invention is relatively low, and it is easy to operate and maintain, and the present invention makes good use of the waste heat after VOC oxidation to treat VOC-containing VOC in the heat exchanger. Preheating the desorbed gas can save the energy needed to heat the desorbed gas, and finally effectively remove VOCs in the exhaust gas.

In this preferred embodiment, the catalyst oxidation treatment unit 40 also includes a heater 100 disposed in the second pipeline 42, and the heater 100 is used to further heat the pre-heated desorption gas to the catalyst reactor 60. However, if the temperature of the desorbed gas in the heat exchanger 50 can be raised to the required working temperature of the catalyst reactor 60, then the heater 100 can also be omitted or have no effect.

In this preferred embodiment, in order to accurately control the supplementary amount of the oxidizing gas, the catalyst oxidation treatment unit 60 may further include an oxidizing gas sensor 110 and a controller 120, the oxidizing gas sensor 110 is arranged in the fourth pipeline 44 and For sensing the oxidizing gas content in the pipeline, the controller 120 is electrically connected to the intake unit 70 , the exhaust unit 80 and the oxidizing gas sensor 110 , and the controller 120 can be accurately and precisely based on the signal sensed by the oxidizing gas sensor 110 Control the intake air volume of the air intake unit 70, and correspondingly control the exhaust air volume of the exhaust unit 80 according to the intake air volume of the air intake unit 70. 40 The discharge flow rate is approximately equal, so that the internal flow rate of the pipeline is kept stable, so as to facilitate the control of the desorption operation.

In this preferred embodiment, the catalyst oxidation treatment unit 40 further includes a sprinkler 130 disposed on the fourth pipeline 44 , and the controller 120 is further electrically connected to the sprinkler 130 . The sprinkler 130 is used to replenish water into the pipeline to reduce the temperature of the desorption gas, otherwise, if the temperature of the desorption gas is too high, the adsorption material may lose activity or spontaneously ignite. Of course, if the desorbed gas in the fourth pipeline 44 can quickly dissipate heat naturally in the fourth pipeline 44 so that the adsorption material does not have the risk of self-ignition, the sprinkler 130 can also be omitted or not function. Since additional water is supplemented in the pipeline, the controller 120 can further control the exhaust volume of the exhaust unit 80 according to the amount of water sprayed by the sprinkler 130 and the intake air volume of the air intake unit 70, so that the pipeline can flow remains stable.

In this preferred embodiment, in order to accurately control the amount of water sprayed by the sprinkler 130, the catalyst oxidation treatment unit 40 may further include a temperature sensor 140 disposed in the fourth pipeline 44 and between the sprinkler 130 and the adsorption/desorption Between the towers 10a and 10b, the temperature of the gas in the pipeline is sensed. The controller 120 is electrically connected to the temperature sensor 140, and controls the amount of water sprayed by the sprinkler 130 according to the signal of the temperature sensor 140, so that the desorbed gas Can be precisely cooled down to the proper working temperature.

In the foregoing embodiments, the air intake unit 70 and the oxidizing gas sensor 110 are respectively communicated with or arranged on the first pipeline 41 and the fourth pipeline 44, but the positions of the two can be adjusted, as shown in FIG. 2 In the second embodiment, the intake unit 70 is connected to the second pipeline 42, and the oxidizing gas sensor 110 is connected to the third pipeline 43, so that the design objectives of the two can also be achieved. In addition, in the second embodiment, the adsorption windmill 35 is relocated to the exhaust gas supply pipeline 20, and the desorption windmill 90 is relocated to the fourth pipeline 44, which can also drive the gas to flow in the discharge pipeline. In order to further ensure that the adsorption/desorption towers 10a, 10b will not spontaneously ignite due to the high-temperature desorbed gas, two additional temperature sensors 140a, 140b are additionally arranged in front of the intake ends of the absorption/desorption towers 10a, 10b. When the temperature sensors 140a, 140b When it is sensed that the temperature of the desorption gas is too high, sprinklers (not shown) inside the absorption/desorption towers 10a, 10b can be activated to cool down.

It should be noted that although the VOC treatment devices in the foregoing embodiments only include two absorption/desorption towers, in fact, additional absorption/desorption towers can be added according to demand, and these absorption/desorption towers can respectively perform adsorption operations, desorption Adsorption operation or standing still; under the environment with sufficient gas flow or other appropriate conditions, multiple adsorption/desorption towers can perform adsorption operations at the same time, and similarly, multiple absorption/desorption towers can also perform desorption operations at the same time.

Finally, it must be explained again that the constituent components disclosed in the foregoing embodiments of the present invention are only for illustration and are not intended to limit the scope of the present invention. The substitution or change of other equivalent components should also be included in the present invention. The scope of the new patent application is covered.

Claims (10)

1. a volatile organic compound treatment apparatus, is characterized in that, comprising:

At least two suctions/desorption column, respectively this suction/desorption column has an inlet end and an exhaust end;

One waste gas feeding pipe, is alternately communicated in the inlet end of those suction/desorption column, makes this suction/desorption column carry out adsorption operation;

One adsorbs rear gas discharging pipeline, is communicated in the exhaust end of the suction/desorption column being communicated with this waste gas feeding pipe; And

One catalyst oxidation processing unit, alternately be communicated in those suction/desorption column to carry out desorption operation, both are not communicated in identical suction/desorption column this waste gas feeding pipe and catalyst oxidation processing unit simultaneously, this catalyst oxidation processing unit comprises a heat exchanger, one hydrogen-catalyst reactor, one air admission unit, one exhaust unit, one first pipeline, one second pipeline, one the 3rd pipeline and one the 4th pipeline, this heat exchanger has a cold air path and a hot gas path, one air inlet of this cold air path is to be communicated with the exhaust end that is communicated in the suction/desorption column of catalyst oxidation processing unit by this first pipeline, one exhaust outlet of this cold air path is communicated with an air inlet of this hydrogen-catalyst reactor by this second pipeline, one exhaust outlet of this hydrogen-catalyst reactor is communicated with an air inlet of this hot gas path by the 3rd pipeline, one exhaust outlet of this hot gas path is communicated with the inlet end that is communicated in the suction/desorption column of catalyst oxidation processing unit by the 4th pipeline, this air admission unit is communicated in the first or second pipeline and supplies to import the required oxidizing gas of hydrogen-catalyst reactor, this exhaust unit is communicated in the 4th pipeline and supplies the portion gas in discharge line.

2. volatile organic compound treatment apparatus according to claim 1, is characterized in that, wherein this catalyst oxidation processing unit comprises that a heater is located at this second pipeline.

3. volatile organic compound treatment apparatus according to claim 1, it is characterized in that, wherein this catalyst oxidation processing unit comprises an oxidizing gas sensor and a controller, this oxidizing gas sensor is located at the 3rd or the 4th pipeline and is supplied the oxidizing gas content in sensing pipeline, this controller is electrically connected at this air admission unit, this exhaust unit and this oxidizing gas sensor, and this controller is controlled the air inflow of this air admission unit according to the signal of this oxidizing gas sensor institute sensing, and according to the air inflow of this air admission unit, correspondingly control the capacity of this exhaust unit.

4. volatile organic compound treatment apparatus according to claim 3, it is characterized in that, wherein this catalyst oxidation processing unit comprises that a water sprinkler is located at the 4th pipeline, this controller is electrically connected at this water sprinkler, and according to the air inflow of the watering amount of this water sprinkler and this air admission unit, correspondingly controls the capacity of this exhaust unit.

5. volatile organic compound treatment apparatus according to claim 4, it is characterized in that, wherein this catalyst oxidation processing unit comprises that a temperature sensor is located at the 4th pipeline and the gas temperature between this water sprinkler and suction/desorption column and in confession sensing pipeline, this controller is electrically connected this temperature sensor, and according to the signal of this temperature sensor, controls the watering amount of this water sprinkler.

6. volatile organic compound treatment apparatus according to claim 2, it is characterized in that, wherein this catalyst oxidation processing unit comprises an oxidizing gas sensor and a controller, this oxidizing gas sensor is located at the 3rd or the 4th pipeline and is supplied the oxidizing gas content in sensing pipeline, this controller is electrically connected at this air admission unit, this exhaust unit and this oxidizing gas sensor, and this controller is controlled the air inflow of this air admission unit according to the signal of this oxidizing gas sensor institute sensing, and according to the air inflow of this air admission unit, correspondingly control the capacity of this exhaust unit.

7. volatile organic compound treatment apparatus according to claim 6, it is characterized in that, wherein this catalyst oxidation processing unit comprises that a water sprinkler is located at the 4th pipeline, this controller is electrically connected at this water sprinkler, and according to the air inflow of the watering amount of this water sprinkler and this air admission unit, correspondingly controls the capacity of this exhaust unit.

8. volatile organic compound treatment apparatus according to claim 7, it is characterized in that, wherein this catalyst oxidation processing unit comprises that a temperature sensor is located at the 4th pipeline and the gas temperature between this water sprinkler and heat exchanger and in confession sensing pipeline, this controller is electrically connected this temperature sensor, and according to the signal of this temperature sensor, controls the watering amount of this water sprinkler.

9. according to the volatile organic compound treatment apparatus described in any one in claim 1 to 8, it is characterized in that, wherein this catalyst oxidation processing unit comprises that a desorption windmill is located in first to fourth pipeline wherein one.

10. according to the volatile organic compound treatment apparatus described in any one in claim 1 to 8, it is characterized in that, comprise that an absorption windmill is located at gas discharging pipeline or this waste gas feeding pipe after this absorption.