阅读说明：本技术 一种高效热量回收的VOCs处理系统 (VOCs processing system of high-efficient heat recovery ) 是由 王敏 李一伟 吴兴祥 李晓东 于 2021-08-27 设计创作，主要内容包括：本发明涉及一种高效热量回收的VOCs处理系统,用于大风量、低浓度VOCs废气治理,包括控制子系统、催化床、电加热辅热、二级换热器和n个固定吸附床；所述VOCs处理系统运行时,所述控制子系统依次控制所述n-2m个吸附状态的固定吸附床中的m个为脱附状态的固定吸附床、控制原m个脱附状态的固定吸附床为m个冷却状态的固定吸附床、控制原m个冷却状态的固定吸附床为m个吸附状态的固定吸附床；部分VOCs废气通过所述n-2m个吸附状态的固定吸附床吸附净化；其余部分VOCs废气通过所述催化床燃烧净化,燃烧净化后的高温气体通过二级换热器对所述其余部分VOCs废气加热、进行热量二次回收利用。有益效果是冷却气源和脱附气源质量高、处理风量大、热量利用率高。(The invention relates to a VOCs treatment system for efficient heat recovery, which is used for treating large-air-volume and low-concentration VOCs waste gas and comprises a control subsystem, a catalytic bed, an electric heating auxiliary heat exchanger, a secondary heat exchanger and n fixed adsorption beds; when the VOCs treatment system is in operation, the control subsystem sequentially controls m fixed adsorption beds in the n-2m fixed adsorption beds in the adsorption state to be in the desorption state, m fixed adsorption beds in the original m desorption state to be in the cooling state, and m fixed adsorption beds in the original m cooling state to be in the adsorption state; part of VOCs waste gas is adsorbed and purified by the n-2m fixed adsorption beds in the adsorption state; and the rest part of VOCs waste gas is combusted and purified through the catalytic bed, and the rest part of VOCs waste gas is heated through the secondary heat exchanger by the high-temperature gas after combustion and purification, so that the heat is recycled for the second time. The device has the advantages of high quality of a cooling air source and a desorption air source, large air handling capacity and high heat utilization rate.)

1. The utility model provides a high-efficient heat recovery's VOCs processing system for big amount of wind, low concentration VOCs waste gas are administered, its characterized in that: comprises a control subsystem (12), a catalytic bed (15), an electric heating auxiliary heater (8), a secondary heat exchanger (9) and n fixed adsorption beds (3); the control subsystem (12) is used for controlling the operation of the VOCs treatment system; n-2m of the n fixed adsorption beds (3) are in an adsorption state, m are in a desorption state, and m are in a cooling state, wherein n and m are positive integers, and n-2m is a positive integer multiple of m; when the VOCs treatment system is in operation, the control subsystem (12) sequentially controls m fixed adsorption beds (3) in the n-2m fixed adsorption beds (3) in the adsorption state to be in the desorption state, controls the original m fixed adsorption beds (3) in the desorption state to be in m fixed adsorption beds (3) in the cooling state, and controls the original m fixed adsorption beds (3) in the cooling state to be in m fixed adsorption beds (3) in the adsorption state; part of VOCs waste gas is absorbed and purified by the n-2m fixed adsorption beds (3) in the adsorption state; and the rest part of VOCs waste gas passes through the m fixed adsorption beds (3) in the cooling state, is heated to the desorption temperature through a secondary heat exchanger (9) and an electric heating auxiliary heater (8), is combusted and purified through the catalytic bed (15) after passing through the m fixed adsorption beds (3) in the desorption state, and is heated through the secondary heat exchanger (9) and subjected to secondary heat recovery.

2. A high efficiency heat recovery VOCs processing system as recited in claim 1, wherein: n-2 of the n fixed adsorption beds (3) are in an adsorption state, 1 is in a desorption state, and 1 is in a cooling state.

3. A high efficiency heat recovery VOCs processing system as recited in claim 2, wherein: the device also comprises a filter box (1), an adsorption fan (7), a chimney (10) and a desorption fan (13); the fixed adsorption bed (3) comprises an adsorption inlet, an adsorption outlet, a cooling outlet, a desorption inlet and a desorption outlet, and the secondary heat exchanger (9) comprises a primary inlet, a primary outlet, a secondary inlet and a secondary outlet; VOCs waste gas enters the filter tank (1) through a pipeline, the outlet of the catalytic bed (15) is connected with the inlet of a desorption fan (13) through a pipeline, the first-stage outlet of the secondary heat exchanger (9) is connected with the inlet of an electric heating auxiliary heater (8) through a pipeline, and the second-stage outlet of the secondary heat exchanger (9) and the outlet of an adsorption fan (7) are connected with a chimney (10) through pipelines; an adsorption air inlet pipeline (2) of a series valve is arranged between an outlet of the filter box (1) and an adsorption inlet of the fixed adsorption bed (3), an adsorption air outlet pipeline (4) of a series valve is arranged between an adsorption outlet of the fixed adsorption bed (3) and an inlet of the adsorption fan (7), a cooling pipeline (5) of a series valve is arranged between a cooling outlet of the fixed adsorption bed (3) and a first-stage inlet of the secondary heat exchanger (9), a desorption air inlet pipeline (6) of a series valve is arranged between an outlet of the electric heating auxiliary heat (8) and a desorption inlet of the fixed adsorption bed (3), a desorption air outlet pipeline (16) of a series valve is arranged between a desorption outlet of the fixed adsorption bed (3) and an inlet of the catalytic bed (15), and a catalytic air outlet pipeline (11) of a series valve is arranged between an outlet of the desorption fan (13) and a second-stage inlet of the secondary heat exchanger (9), the control subsystem (12) is also used for controlling the pipeline switch through a valve.

4. A high efficiency heat recovery VOCs processing system as recited in claim 3, wherein: the filter box (1) is used for efficiently filtering paint mist particles in the VOCs waste gas.

5. The system of claim 4 for treating VOCs with high efficiency heat recovery, wherein: the fixed adsorption bed (3) comprises a zeolite molecular sieve inside and is used for carrying out adsorption concentration on low-concentration VOCs waste gas.

6. A high efficiency heat recovery VOCs processing system as recited in claim 3, wherein: the control subsystem (12) comprises a processor and a memory, the memory storing a program that when executed by the processor performs the steps of:

s1, sequentially setting 1 of the n-2 fixed adsorption beds (3) in the adsorption state as a fixed adsorption bed (3) in the desorption state, setting the fixed adsorption bed (3) in the original desorption state as a fixed adsorption bed (3) in the cooling state, and setting the fixed adsorption bed (3) in the original cooling state as a fixed adsorption bed (3) in the adsorption state according to time;

s2, in the adsorption process, the adsorption fan (7) provides a power source, part of VOCs waste gas is filtered by the filter box (1) and then enters the fixed adsorption bed (3) in the adsorption state through the adsorption air inlet pipeline (2) for low-temperature adsorption and purification, and the purified VOCs waste gas is discharged through the adsorption air outlet pipeline (4) and the chimney (10);

s3, allowing the rest part of VOCs waste gas in the cooling process to enter the fixed adsorption bed in the cooling state through the filter box (1) and the adsorption air inlet pipeline (2) for cooling, and allowing the cooled VOCs waste gas to enter the cooling pipeline (5) as a desorption process gas source;

s4, the desorption fan (13) provides a power source in the desorption process, the cooled VOCs waste gas is heated to the desorption temperature through the secondary heat exchanger (9) and the electric heating auxiliary heat (8) and then enters the fixed adsorption bed (3) in the desorption state for desorption, the desorbed high-concentration VOCs gas enters the catalytic bed (15) through the desorption gas outlet pipeline (16) for catalytic combustion, and the gas after catalytic combustion is subjected to heat exchange through the secondary heat exchanger (9) and then is discharged through a chimney (10).

7. A high efficiency heat recovery VOCs processing system as recited in claim 6, wherein: the catalytic bed (15) is used for carrying out catalytic combustion on the desorbed high-concentration VOCs waste gas, reacting the waste gas with oxygen to form harmless gas and releasing a large amount of heat energy; the inside of the catalytic bed (15) comprises a catalyst, electric heating and a heat exchanger, wherein the electric heating is used for heating before ignition and keeping the temperature inside the catalytic bed (15) in a proper range, and the heat exchanger is used for utilizing the residual heat after catalytic combustion and improving the heat utilization efficiency.

8. A high efficiency heat recovery VOCs processing system as recited in claim 7, wherein: and a circulating pipeline (14) of a series valve is arranged between the outlet of the desorption fan (13) and the inlet of the catalytic bed (15).

9. A system for processing VOCs with efficient heat recovery as recited in claim 8, wherein said program when executed by said processor further performs the steps of:

s0, in the circulation process, before the catalytic bed (15) is started, the desorption fan (13), the circulation pipeline (14) and the catalytic bed (15) form a circulation loop, and the circulation waste heat reaches the specified catalytic temperature under the action of electric heating of the catalytic bed (15).

[ technical field ] A method for producing a semiconductor device

The invention relates to the field of organic waste gas purification and treatment, in particular to a VOCs (volatile organic chemicals) treatment system for efficient heat recovery.

[ background of the invention ]

Volatile Organic Compounds, commonly referred to as VOCs, are the first letter of the three Volatile Organic Compounds. RTO-Regenerative Thermal incinerator, English name "Regenerative Thermal Oxidizer", abbreviated as "RTO". The waste gas treatment technology of zeolite concentration rotating wheel adsorption-RTO catalytic combustion is a common combined waste gas treatment process in the field of environmental protection waste gas treatment. VOCs waste gas passes through the zeolite concentration rotating wheel and then can be effectively adsorbed in zeolite, so that the purpose of removal is achieved. The volatile gas adsorbed by the zeolite is cleaned and then directly discharged into the atmosphere through a chimney; the runner lasts to rotate with 1-6 revolutions per hour, conveys the volatile organic compounds of absorption to the desorption district simultaneously, utilizes a little heated gas to carry out the desorption with volatile organic compounds in the desorption district, and the zeolite runner after the desorption is rotatory to the adsorption district, lasts the absorption volatile organic gas. And (4) sending the desorbed concentrated organic waste gas to an incinerator for combustion to convert into carbon dioxide and water vapor, and discharging into the atmosphere.

With economic development, environmental problems become more serious, and the treatment of the VOCs becomes one of important works of environmental treatment, wherein the industrial coating industry is the key industry of VOCs emission control, and has the characteristics of large air volume and low concentration, and the treatment difficulty is large. At present, the zeolite molecular sieve adsorption concentration and catalytic combustion treatment process is mostly adopted, most workshops are transformed from old workshops, and the size and space of a rear machine room are limited, so that the fixed bed zeolite molecular sieve adsorption concentration and catalytic combustion process has certain market requirements. However, due to the characteristic of paint spraying concentration fluctuation, the old process needs to adopt the air outside the system to heat to the desorption temperature for desorption in the use process, but because the dust outside the system is more and a large amount of heat is needed to heat to the desorption temperature, the treatment equipment usually needs to consume more energy in the operation process, and the operation cost is high. On the premise that industrial coating must reach the standard, a processing system with high processing efficiency and high heat recovery utilization rate is needed, the energy consumption of equipment operation is reduced, and green operation is really realized.

[ summary of the invention ]

The invention aims to provide a VOCs treatment system which is used for treating VOCs waste gas with large air quantity and low concentration, and has high cooling air source and desorption air source quality, large treated air quantity and high heat utilization rate.

In order to achieve the purpose, the invention adopts the technical scheme that the VOCs treatment system for efficient heat recovery is used for treating VOCs waste gas with large air volume and low concentration, and comprises a control subsystem, a catalytic bed, an electric heating auxiliary heat exchanger, a secondary heat exchanger and n fixed adsorption beds; the control subsystem is used for controlling the operation of the VOCs treatment system; n-2m of the n fixed adsorption beds are in an adsorption state, m of the n fixed adsorption beds are in a desorption state, and m of the n fixed adsorption beds are in a cooling state, wherein n and m are positive integers, and n-2m is a positive integer multiple of m; when the VOCs treatment system is in operation, the control subsystem sequentially controls m fixed adsorption beds in the n-2m fixed adsorption beds in the adsorption state to be in the desorption state, m fixed adsorption beds in the original m desorption state to be in the cooling state, and m fixed adsorption beds in the original m cooling state to be in the adsorption state; part of VOCs waste gas is adsorbed and purified by the n-2m fixed adsorption beds in the adsorption state; and the rest part of VOCs waste gas passes through the m fixed adsorption beds in the cooling state, is heated to the desorption temperature through a secondary heat exchanger and electric heating auxiliary heat, passes through the m fixed adsorption beds in the desorption state, is combusted and purified through the catalytic bed, and the rest part of VOCs waste gas is heated through the secondary heat exchanger by high-temperature gas after being combusted and purified, so that the heat is recycled secondarily.

Preferably, in the above-mentioned system for processing VOCs with high efficiency of heat recovery, n-2 fixed adsorbent beds are in an adsorption state, 1 fixed adsorbent bed is in a desorption state, and 1 fixed adsorbent bed is in a cooling state.

Preferably, the above-mentioned system for treating VOCs with high efficiency heat recovery further comprises a filter box, an adsorption fan, a chimney and a desorption fan; the fixed adsorption bed comprises an adsorption inlet, an adsorption outlet, a cooling outlet, a desorption inlet and a desorption outlet, and the secondary heat exchanger comprises a primary inlet, a primary outlet, a secondary inlet and a secondary outlet; the VOCs waste gas enters the filter tank through a pipeline, the outlet of the catalytic bed is connected with the inlet of a desorption fan through a pipeline, the outlet of the first stage of the secondary heat exchanger is connected with the electric heating auxiliary heat inlet through a pipeline, and the outlet of the second stage of the secondary heat exchanger and the outlet of the adsorption fan are connected with a chimney through pipelines; the system comprises a filter box, a fixed adsorption bed, a heat exchanger, a secondary heat exchanger and a control subsystem, wherein an adsorption air inlet pipeline of a series valve is arranged between an outlet of the filter box and an adsorption inlet of the fixed adsorption bed, an adsorption air outlet pipeline of the series valve is arranged between an adsorption outlet of the fixed adsorption bed and an inlet of an adsorption fan, a cooling pipeline of the series valve is arranged between a cooling outlet of the fixed adsorption bed and a primary inlet of the secondary heat exchanger, a desorption air inlet pipeline of the series valve is arranged between an electric heating auxiliary heat outlet and a desorption inlet of the fixed adsorption bed, a desorption air outlet pipeline of the series valve is arranged between a desorption outlet of the fixed adsorption bed and an inlet of a catalytic bed, a catalytic air outlet pipeline of the series valve is arranged between an outlet of the desorption fan and a secondary inlet of the secondary heat exchanger, and the control subsystem is further used for controlling a pipeline switch through the valve.

Preferably, in the above-mentioned system for treating VOCs with efficient heat recovery, the filter box efficiently filters paint mist particles in the waste gas of VOCs.

Preferably, in the above-mentioned system for processing VOCs with high efficiency of heat recovery, the fixed adsorbent bed includes zeolite molecular sieve inside for performing adsorption concentration on the waste gas with low concentration of VOCs.

Further, in the above-mentioned system for processing VOCs with efficient heat recovery, the control subsystem (12) comprises a processor and a memory, the memory storing a program which when executed by the processor performs the steps of:

s1, sequentially setting 1 of the n-2 fixed adsorption beds in the adsorption state as a fixed adsorption bed in the desorption state, setting the fixed adsorption bed in the original desorption state as a fixed adsorption bed in the cooling state and setting the fixed adsorption bed in the original cooling state as a fixed adsorption bed in the adsorption state according to time;

s2, the adsorption fan provides a power source in the adsorption process, part of VOCs waste gas enters the fixed adsorption bed in the adsorption state through the adsorption air inlet pipeline after being filtered by the filter box, and is subjected to low-temperature adsorption purification, and the purified VOCs waste gas is discharged through the adsorption air outlet pipeline and the chimney;

s3, allowing the rest part of VOCs waste gas in the cooling process to enter the fixed adsorption bed in the cooling state through the filter box and the adsorption air inlet pipeline for cooling, and allowing the cooled VOCs waste gas to enter the cooling pipeline as a desorption process gas source;

and S4, in the desorption process, the desorption fan provides a power source, the cooled VOCs waste gas is heated to the desorption temperature through the secondary heat exchanger and the electric heating auxiliary heat and then enters the fixed adsorption bed in the desorption state for desorption, the desorbed high-concentration VOCs gas enters the catalytic bed through the desorption gas outlet pipeline for catalytic combustion, and the gas after catalytic combustion is subjected to heat exchange through the secondary heat exchanger and then is discharged through a chimney.

Preferably, in the above-mentioned system for processing VOCs with high efficiency heat recovery, the catalytic bed is used for performing catalytic combustion on the desorbed high-concentration VOCs waste gas, reacting with oxygen to form harmless gas, and releasing a large amount of heat energy; the inside of the catalytic bed comprises a catalyst, electric heating and a heat exchanger, wherein the electric heating is used for heating before ignition and keeping the temperature inside the catalytic bed in a proper range, and the heat exchanger is used for utilizing the residual heat after catalytic combustion and improving the heat utilization efficiency.

Preferably, in the above-mentioned system for processing VOCs with high efficiency of heat recovery, a circulation pipeline of a series valve is arranged between the outlet of the desorption fan and the inlet of the catalyst bed.

Preferably, in the above-mentioned system for processing VOCs with efficient heat recovery, the program when executed by the processor further implements the following steps:

and S0, in the circulation process, before the catalytic bed is started, the desorption fan, the circulation pipeline and the catalytic bed form a circulation loop, and the circulation waste heat reaches the specified catalytic temperature under the action of the electric heating of the catalytic bed.

The VOCs treatment system for efficient heat recovery has the following beneficial effects: the efficient treatment of the large-air-volume and low-concentration VOCs waste gas during coating is realized through the filter box, the fixed adsorption bed, the catalytic bed, the secondary heat exchanger, the electric heating auxiliary heat, the adsorption fan, the desorption fan, various connecting pipelines and the control system, the efficient utilization of the combustion preheating of the VOCs is realized through the heat exchanger and the secondary heat exchanger inside the catalytic bed, and meanwhile, the cooling gas is filtered, so that the high air source quality is realized, and the efficient purification of the VOCs treatment system is ensured; with cooling circuit and desorption return circuit intercommunication, effectively utilize the cooling gas, have cooling air source and desorption air source high quality, increase the workshop and handle the amount of wind, heat utilization rate is high, system operation is stable, advantages such as intelligent control, through heat secondary recycle, solved the problem that big air volume low concentration spraying workshop is administered difficultly, the operation energy consumption is high, finally realized the high-efficient energy-conserving management in big air volume low concentration VOCs waste gas spraying workshop.

[ description of the drawings ]

Fig. 1 is a block diagram of a high efficiency heat recovery VOCs processing system.

The reference numerals and components referred to in the drawings are as follows: 1. the system comprises a filter box, 2, an adsorption air inlet pipeline, 3, a fixed adsorption bed, 4, an adsorption air outlet pipeline, 5, a cooling pipeline, 6, a desorption air inlet pipeline, 7, an adsorption fan, 8, electric heating auxiliary heat, 9, a secondary heat exchanger, 10, a chimney, 11, a catalysis air outlet pipeline, 12, a control subsystem, 13, a desorption fan, 14, a circulation pipeline, 15, a catalysis bed, 16 and a desorption air outlet pipeline.

[ detailed description ] embodiments

The invention is further described with reference to the following examples and with reference to the accompanying drawings.

Examples

This embodiment realizes a VOCs processing system of high-efficient heat recovery.

Fig. 1 is a block diagram of a high efficiency heat recovery VOCs treatment system. As shown in fig. 1, the system for treating VOCs with high efficiency heat recovery in this embodiment includes a filter box 1, a fixed adsorption bed 3, a catalytic bed 15, a secondary heat exchanger 9, an electric heating auxiliary heater 8, an adsorption fan 7, a chimney 10, a desorption fan 13, each connecting pipeline, and a control subsystem 12; each connecting pipeline comprises an adsorption air inlet pipeline 2, an adsorption air outlet pipeline 4, a cooling pipeline 5, a desorption air inlet pipeline 6, a catalysis air outlet pipeline 11, a circulating pipeline 14 and a desorption air outlet pipeline 16; be used for large-scale application trade VOCs to administer, with cooling circuit and desorption return circuit intercommunication, effectively utilize the cooling gas, have cooling gas source and desorption air source high quality, increase the workshop and handle the amount of wind, heat utilization rate is high, the system operation is stable, advantages such as intelligent control, through heat secondary recycle, solved big wind volume low concentration spraying workshop and administered the problem difficult, that the running energy consumption is high, finally realized the high-efficient energy-conserving management in big wind volume low concentration VOCs waste gas spraying workshop.

In the efficient heat recovery VOCs treatment system of the embodiment, the filter box 1 is used for efficiently filtering paint mist particles in VOCs waste gas to protect rear-end treatment equipment; the fixed adsorption bed 3 contains zeolite molecular sieve for adsorbing and concentrating low-concentration VOCs waste gas; the catalytic bed 15 is used for carrying out catalytic combustion on the high-concentration VOCs waste gas; the secondary heat exchanger 9 and the electric heating auxiliary heat 8 are used for heating the cooled gas to a desorption temperature; the adsorption fan 7 and the desorption fan 13 are used for providing a system adsorption and desorption power source; the chimney 10 is used for discharging adsorbed gas; the connecting pipeline is connected with each part to form a passage; the control subsystem 12 controls the actions of all the components, monitors the states of the components in real time, and completes VOCs treatment and efficient heat recovery.

In the present embodiment of the system for processing VOCs with efficient heat recovery, the fixed adsorption bed 3 is composed of n adsorption beds, wherein n-2 adsorption beds are in an adsorption state, 1 adsorption bed is in a desorption state, 1 adsorption bed is in a cooling state, and the states of the adsorption beds are switched by the control subsystem 12 according to time; the adsorption, desorption and cooling of each adsorption bed are sequentially switched by the switching of a valve, so that the aim of adsorbing and concentrating the VOCs waste gas with large air volume and low concentration is fulfilled; the fixed adsorption bed can adjust the position and the size of the fixed adsorption bed according to the site situation of the rear machine room, and has the advantage of high adaptability. Specifically, n-2 fixed adsorption beds 3 in the adsorption state are set by the control subsystem 12, one of the fixed adsorption beds 3 in the desorption state is set as the fixed adsorption bed 3 in the cooling state, the fixed adsorption bed 3 in the cooling state is set as the fixed adsorption bed 3 in the adsorption state, and the steps are repeated.

This embodiment a high-efficient heat recovery's VOCs processing system, VOCs waste gas are in under the effect of adsorption fan 1, the process filtration tank 1, adsorption state's fixed adsorption bed 3 accomplish the absorption and purify, and it discharges to reach standard through chimney 10. VOCs waste gas passes through after the rose box 1 filters the absorption inlet line 2 gets into the adsorption state's fixed adsorption bed 3 adsorbs and purifies the back gets into adsorb outlet line 4 with chimney 10 discharges, adsorption fan 7 provides the adsorption power source.

In the system for treating VOCs with high efficiency heat recovery of the embodiment, a part of VOCs waste gas passes through the filter box and then is cooled down to the fixed adsorption bed in the cooling state, the cooled gas reaches the desorption temperature after being subjected to heat exchange by the secondary heat exchanger 9 and heating by the electric heating auxiliary heat 8, the fixed adsorption bed 3 in the desorption state is subjected to desorption, the desorbed high-concentration VOCs waste gas enters the catalytic bed 15 for catalytic combustion, and the desorption fan 13 provides a power source for the above processes.

This embodiment a high-efficient heat recovery's VOCs processing system, rose box 1 carries out effective filtration to the coating cloud granule in the VOCs waste gas, makes it satisfy the rear end equipment processing requirement, guarantees whole system treatment.

This embodiment a high-efficient heat recovery's VOCs processing system, fixed adsorption bed 3 is inside to contain zeolite molecular sieve adsorbing material, adsorbs when low temperature, and desorption during the high temperature forms low temperature adsorption and purifies VOCs waste gas, and desorption during the high temperature goes out high concentration VOCs gas, and the desorption is accomplished the back and is cooled regeneration, forms the circulation.

In the system for treating VOCs with high efficiency heat recovery of this embodiment, a part of the VOCs waste gas cools the cooled fixed adsorbent bed 3 (the fixed adsorbent bed 3 after desorption) through the filter box 1 and the adsorption gas inlet pipeline 2; the fixed adsorption bed 3 in the cooling state is cooled by normal-temperature gas filtered by the filter box 1, and the cooled gas is desorbed by the secondary heat exchanger 9 and the electric heating auxiliary heat 8 which are heated to a specific desorption temperature.

In the present embodiment of a system for processing VOCs with efficient heat recovery, after the secondary heat exchanger 9 and the electric heating auxiliary heat 8 heat and cool the cooled gas to a specific desorption temperature, the gas enters the fixed adsorption bed 3 in the desorption state through the desorption inlet pipeline 6 for desorption, and then enters the catalytic bed 15 through the desorption outlet pipeline 16 for catalytic combustion, and the qualified gas is discharged through the chimney 10 after being subjected to heat exchange by the secondary heat exchanger 9.

In the system for treating VOCs with high heat recovery efficiency of the present embodiment, the catalytic bed 15 catalyzes and burns desorbed high-concentration VOCs gas to react with oxygen to form harmless gas and release a large amount of heat energy, and the heat exchanger therein effectively utilizes heat. The inside of the catalytic bed 15 contains a catalyst, an electric heater and a heat exchanger, catalytic combustion is carried out on high-concentration VOCs gas, the electric heater is used for heating before ignition, the temperature inside the catalytic bed is kept in a proper range, and the heat exchanger utilizes waste heat after catalytic combustion to improve the heat utilization efficiency.

The VOCs processing system of high-efficient heat recovery of this embodiment, control subsystem 12 control system automatic operation, control subsystem 12 passes through signal feedback and the above-mentioned absorption of equipment information control, cooling and desorption process to each part state real-time recording realizes processing system intelligent operation.

According to the VOCs treatment system with high-efficiency heat recovery, the filter box 1, the fixed adsorption bed 3, the catalytic bed 15, the secondary heat exchanger 9, the electric heating auxiliary heat 8, the adsorption fan 7, the desorption fan 13, the connecting pipelines and the control subsystem 12 are used for realizing effective treatment of the VOCs waste gas with large coating air volume and low concentration, the heat exchanger inside the catalytic bed 15 and the secondary heat exchanger 9 are used for realizing high-efficiency utilization of combustion and preheating of the VOCs waste gas, meanwhile, the cooling gas adopts the system filtering gas, so that the system has high air source quality, and high-efficiency purification of the VOCs waste gas treatment system is ensured.

The embodiment is a VOCs processing system of high-efficient heat recovery, has advantages such as cooling air supply and desorption air supply high quality, increase workshop processing amount of wind, heat utilization rate height, system operation are stable, intelligent control, through heat secondary recycle, has solved the problem that big air volume low concentration spraying workshop is administered difficultly, the running energy consumption is high, has finally realized the high-efficient energy-conserving management in big air volume low concentration VOCs waste gas spraying workshop.

The specific working steps of the VOCs treatment system control subsystem 12 for efficient heat recovery for controlling the adsorption, cooling and desorption processes are as follows:

1. a cyclic process;

the catalytic combustion of the catalytic bed 15 needs to reach a specified catalytic temperature, so before the start of the device, a circulation loop is formed by the desorption fan 13, the circulation pipeline 14 and the catalytic bed 15, and the circulating residual heat reaches the specified catalytic temperature under the action of the electric heating of the catalytic bed 15; the cycle is controlled and automatically run by the control subsystem 12.

2. An adsorption process;

VOCs waste gas warp rose box 1 filters the back, through adsorb inlet line 2 gets into fixed adsorption bed 3 cryosorption purify, the VOCs waste gas warp after the purification adsorb outlet line 4 with chimney 10 discharges, adsorption fan 7 provides the power supply for the adsorption process. The adsorption process is controlled and automatically operated by the control subsystem 12.

3. A cooling process;

the adsorption bed in the fixed adsorption bed 3 after desorption is in a high-temperature state and needs to be cooled and regenerated; a part of the VOCs waste gas passes through the filter box 1 and the adsorption air inlet pipeline 2 to enter a fixed adsorption bed (an adsorption bed to be cooled, namely the fixed adsorption bed 3 after desorption is finished) in a cooling state for cooling, and the cooled VOCs waste gas enters the cooling pipeline 5 as a desorption gas source. The cooling process is controlled and automatically run by the control subsystem 12.

4. A desorption process;

the cooled exhaust gas is heated to a specified desorption temperature by the secondary heat exchanger 9 and the electric heating auxiliary heat 8 in the cooling pipeline 5, and then enters the fixed adsorption bed 3 in the desorption state for desorption, the desorbed high-concentration VOCs gas enters the catalytic bed 15 through the desorption gas outlet pipeline 16 for catalytic combustion, and the gas after catalytic combustion is subjected to heat exchange by the secondary heat exchanger 9 and then is discharged. The desorption process is controlled and automatically operated by the control subsystem 12.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and additions can be made without departing from the principle of the present invention, and these should also be considered as the protection scope of the present invention.