Anti-blocking high-concentration vocs recovery device and method

Abstract

The application discloses an anti-blocking high-concentration VOCs recovery device, which comprises an anti-blocking VOCs pre-condensation module, an activated carbon adsorption and purification module and an anti-blocking VOCs closed recovery module; the anti-blocking VOCs pre-condensation module is fixedly connected with the activated carbon adsorption and purification module; and the activated carbon adsorption and purification module is fixedly connected with the anti-blocking VOCs closed recovery module. The anti-blocking VOCs pre-condensation module can recover most of VOCs, and is provided with a device for preventing liquid icing and blocking; the remaining non-condensable gas is adsorbed and purified by the activated carbon adsorption and purification module; the anti-blocking VOCs pre-condensation module at the front end of the whole device not only recovers most of VOCs, but also reduces the adsorption burden of the activated carbon adsorption and purification module; the activated carbon adsorption and purification module at the rear end ensures that the VOCs concentration of exhaust gas meets the emission standard; and the saturated activated carbon is regenerated and VOCs are recovered by the anti-blocking closed VOCs recovery module.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of environmental protection, in particular to a high-concentration VOCs recovery device and method capable of preventing blockage. BACKGROUND

[0002] VOCs in industrial organic waste gas have great toxicity and can cause teratogenicity, mutagenicity and carcinogenicity to human bodies. Under sunlight irradiation, VOCs can cause photochemical smog, causing symptoms such as chest tightness, nausea and fatigue. VOCs are important precursors of PM2.5 and ozone, and have great harm to the environment.

[0003] The common VOCs treatment methods can be divided into two categories, one of which is non-destructive recovery technology, such as adsorption, absorption, condensation and membrane separation, etc.; the other is destructive destruction technology, such as combustion, biodegradation, low-temperature plasma, photo-oxygen catalysis, etc. Although VOCs have certain harmfulness, they are also an important industrial resource. Condensation method is a common means for recovering high-concentration VOCs. The condensation process will block the equipment and pipelines due to the presence of easily frozen substances such as acetic acid and water in the organic waste gas, thereby causing equipment damage. In addition, it is difficult to meet the standard and the energy consumption is high for treating VOCs by condensation method. Therefore, we propose a high-concentration VOCs recovery device and method capable of preventing blockage. SUMMARY

[0004] The present application aims to provide a high-concentration VOCs recovery device and method capable of preventing blockage to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a high-concentration VOCs recovery device capable of preventing blockage, comprising a blockage-preventing VOCs pre-condensation module, an activated carbon adsorption and purification module and a blockage-preventing VOCs closed recovery module, wherein the blockage-preventing VOCs pre-condensation module is fixedly communicated with the activated carbon adsorption and purification module, and the activated carbon adsorption and purification module is fixedly communicated with the blockage-preventing VOCs closed recovery module.

[0006] The blockage-preventing VOCs pre-condensation device comprises a first heat recovery heat exchanger, a first VOCs condenser and a first gas-liquid separator, the activated carbon purification module comprises an activated carbon adsorber, an adsorption fan and an exhaust cylinder, and the blockage-preventing VOCs closed recovery module comprises a second heat recovery heat exchanger, a second VOCs condenser, a second gas-liquid separator, a desorption fan and an inert gas heater.

[0007] Condensation is a common means of recycling high concentration VOCs, but the condensation process will block the equipment and pipeline, and further cause equipment damage, and it is difficult to meet the standard and high energy consumption for VOCs treatment. In view of this phenomenon, we propose a kind of anti-blocking high concentration VOCs recovery device and method, especially suitable for the purification and recovery of high concentration VOCs of solvent tank and oil and gas tank breather valve exhaust, reaction kettle exhaust and so on. For high concentration VOCs exhaust, the anti-blocking VOCs pre-condensation module can efficiently recover most of the VOCs, and the anti-blocking VOCs pre-condensation module is provided with a device for preventing liquid ice blocking, and the remaining non-condensable gas is adsorbed and purified by the activated carbon adsorption purification module. The anti-blocking VOCs pre-condensation module at the front end of the whole device not only recovers most of the VOCs, but also reduces the adsorption burden of the activated carbon adsorption purification module, and the activated carbon adsorption purification module at the rear end ensures that the exhaust VOCs concentration meets the emission standard. The saturated activated carbon is desorbed by the anti-blocking closed VOCs recovery module to realize the regeneration of activated carbon and the recovery of VOCs. The first heat recovery heat exchanger and the second heat recovery heat exchanger not only recover energy, but also recover most of the ice-forming substances, realizing the functions of recovering cold energy, removing water and preventing blocking.

[0008] Preferably, the high concentration VOCs source is in fixed communication with the hot side inlet of the first heat recovery heat exchanger through a first connecting pipe, the hot side outlet of the first heat recovery heat exchanger is in fixed communication with the inlet of the first VOCs condenser through a second connecting pipe, the outlet of the first VOCs condenser is in fixed communication with the inlet of the first gas-liquid separator through a third connecting pipe, the outlet of the first gas-liquid separator is in fixed communication with the inlet of the first three-way regulating valve through a fourth connecting pipe, one outlet of the first three-way regulating valve is in fixed communication with the cold side inlet of the first heat recovery heat exchanger through a fifth connecting pipe, the other outlet of the first three-way regulating valve is in fixed communication with the eighth connecting pipe through a seventh connecting pipe, the cold side outlet of the first heat recovery heat exchanger is in fixed communication with the eighth connecting pipe through a sixth connecting pipe, the other end of the eighth connecting pipe is in fixed communication with the adsorption inlet of the activated carbon adsorber, the adsorption outlet of the activated carbon adsorber is in fixed communication with the inlet of the adsorption fan through a ninth connecting pipe, and the outlet of the adsorption fan is in fixed communication with the exhaust cylinder through a tenth connecting pipe.

[0009] Preferably, the desorption outlet of the activated carbon adsorber is fixedly connected to the hot-side inlet of the second heat recovery heat exchanger via an eleventh connecting pipe; the hot-side outlet of the second heat recovery heat exchanger is fixedly connected to the inlet of the second VOCs condenser via a twelfth connecting pipe; the outlet of the second VOCs condenser is fixedly connected to the inlet of the second gas-liquid separator via a thirteenth connecting pipe; the outlet of the second gas-liquid separator is fixedly connected to the inlet of the second three-way regulating valve via a fourteenth connecting pipe; one outlet of the second three-way regulating valve is fixedly connected to the cold-side inlet of the second heat recovery heat exchanger via a fifteenth connecting pipe; the other outlet of the second three-way regulating valve is fixedly connected to the seventeenth and eighteenth connecting pipes; the cold-side outlet of the second heat recovery heat exchanger is fixedly connected to the eighteenth connecting pipe via a sixteenth connecting pipe; the other end of the eighteenth connecting pipe is fixedly connected to the inlet of the desorption fan; the outlet of the desorption fan is fixedly connected to the inlet of the inert gas heater via a nineteenth connecting pipe; and the outlet of the inert gas heater is fixedly connected to the desorption inlet of the activated carbon adsorber via a twentieth connecting pipe.

[0010] Preferably, a first temperature sensor is provided on the fifth connecting pipe, and a second temperature sensor is provided on the fifteenth connecting pipe.

[0011] Preferably, both the first three-way regulating valve and the second three-way regulating valve are configured as stepless regulating valves, and the VOCs closed-loop recovery system operates during off-peak electricity hours at night.

[0012] Preferably, it also includes a solvent storage tank, in which the liquid VOCs recovered by the anti-clogging VOCs pre-condensation module and the anti-clogging closed-loop VOCs recovery module are stored.

[0013] Preferably, the activated carbon adsorber includes multiple adsorption tanks in an adsorption state and one adsorption tank in a desorption state, and the activated carbon used includes, but is not limited to, granular activated carbon, fibrous activated carbon and honeycomb activated carbon.

[0014] A method for recovering high-concentration VOCs without clogging includes the following steps:

[0015] When the anti-clogging VOCs pre-condensation module and the adsorption purification module are running, if the temperature displayed by the first temperature sensor is lower than the threshold temperature, the opening of the first three-way regulating valve is adjusted to increase the flow rate of the seventh connecting pipe branch and decrease the flow rate of the fifth connecting pipe branch; if the temperature displayed by the temperature sensor is higher than the threshold temperature, the opening of the first three-way regulating valve is adjusted to decrease the flow rate of the seventh connecting pipe branch and increase the flow rate of the fifth connecting pipe branch, so that the temperature at the temperature sensor is always near the threshold temperature.

[0016] When the closed-loop VOCs recovery module is running, if the second temperature sensor shows a temperature lower than the threshold temperature, the opening of the second three-way regulating valve is adjusted to increase the flow rate of the seventeenth connecting pipe branch and decrease the flow rate of the fifteenth connecting pipe branch. If the second temperature sensor shows a temperature higher than the threshold temperature, the opening of the second three-way regulating valve is adjusted to decrease the flow rate of the seventeenth connecting pipe branch and increase the flow rate of the fifteenth connecting pipe branch, so that the temperature at the temperature sensor is always near the threshold temperature.

[0017] Preferably, the temperature sensor detects a temperature threshold 2-3°C higher than the freezing point of the easily icing components in the organic exhaust gas, and the hot-side inlet temperature of the first heat recovery heat exchanger is the same as the highest operating temperature.

[0018] Compared with the prior art, the present invention has the following beneficial effects: the present invention is used for the purification and recovery of high concentration VOCs in the exhaust gas of the breather valve of solvent storage tank and oil and gas storage tank, and the exhaust gas of reaction vessel;

[0019] For high-concentration VOCs exhaust gas, an anti-clogging VOCs pre-condensation module can efficiently recover most of the VOCs. This module is equipped with a device to prevent liquid icing and blockage. The remaining non-condensable gases are purified by an activated carbon adsorption purification module. The front-end anti-clogging VOCs pre-condensation module recovers most of the VOCs while reducing the adsorption burden on the activated carbon adsorption purification module, while the rear-end activated carbon adsorption purification module ensures that the exhaust VOCs concentration meets emission standards.

[0020] The saturated activated carbon is desorbed using a closed-loop VOCs recovery module to regenerate the activated carbon and recover VOCs. The first and second heat recovery heat exchangers not only recover energy but also recover most of the substances that are prone to freezing, achieving the functions of recovering cold energy, removing "water", and preventing clogging. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the system structure of the present invention.

[0022] In the figure: 1. High-concentration VOCs source, 2. 1. First heat recovery heat exchanger; 2. First VOCs condenser; 3. First gas-liquid separator; 4. Activated carbon adsorber; 5. First adsorption fan; 6. Exhaust stack; 7. Second heat recovery heat exchanger; 8. Second VOCs condenser; 9. Second gas-liquid separator; 10. Desorption fan; 11. Inert gas heater; 12. Solvent storage tank; 13. First connecting pipe; 14. Second connecting pipe; 15. Third connecting pipe; 16. Fourth connecting pipe; 17. Fifth connecting pipe; 18. Sixth connecting pipe; 19. Seventh connecting pipe; 20. Eighth connecting pipe; 21. Ninth connecting pipe; 23. Tenth connecting pipe; 24. Eleventh connecting pipe; 25. Twelfth connecting pipe; 26. Thirteenth connecting pipe; 27. Fourteenth connecting pipe; 28. Fifteenth connecting pipe; 29. ​​Sixteenth connecting pipe; 30. Seventeenth connecting pipe; 31. Eighteenth connecting pipe; 32. Nineteenth connecting pipe; 33. Twentieth connecting pipe; 34. First temperature sensor; 35. First three-way regulating valve; 36. Second temperature sensor; 37. Second three-way regulating valve. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figure 1 The present invention provides a first embodiment:

[0025] A high-concentration VOCs recovery device for preventing clogging includes a VOCs pre-condensation module for preventing clogging, an activated carbon adsorption and purification module for preventing clogging, and a closed-loop VOCs recovery module for preventing clogging. The VOCs pre-condensation module for preventing clogging is fixedly connected to the activated carbon adsorption and purification module for preventing clogging, and the activated carbon adsorption and purification module for preventing clogging is fixedly connected to the closed-loop VOCs recovery module for preventing clogging.

[0026] The anti-clogging VOCs pre-condensation device includes a first heat recovery heat exchanger 2, a first VOCs condenser 3, and a first gas-liquid separator 4. The activated carbon purification module includes an activated carbon adsorber 5, an adsorption fan 6, and an exhaust stack 7. The anti-clogging VOCs closed-loop recovery module includes a second heat recovery heat exchanger 8, a second VOCs condenser 9, a second gas-liquid separator 10, a desorption fan 11, and an inert gas heater 12.

[0027] Preferably, the high-concentration VOCs source 1 is fixedly connected to the hot-side inlet of the first heat recovery heat exchanger 2 via a first connecting pipe 14; the hot-side outlet of the first heat recovery heat exchanger 2 is fixedly connected to the inlet of the first VOCs condenser 3 via a second connecting pipe 15; the outlet of the first VOCs condenser 3 is fixedly connected to the inlet of the first gas-liquid separator 4 via a third connecting pipe 16; the outlet of the first gas-liquid separator 4 is fixedly connected to the inlet of the first three-way regulating valve 35 via a fourth connecting pipe 17; and one outlet of the first three-way regulating valve 35 is connected to a fifth connecting pipe 18. The first three-way regulating valve 35 is fixedly connected to the cold side inlet of the first heat recovery heat exchanger 2. The other outlet of the first three-way regulating valve 35 is fixedly connected to the eighth connecting pipe 21 through the seventh connecting pipe 20. The cold side outlet of the first heat recovery heat exchanger 2 is fixedly connected to the eighth connecting pipe 21 through the sixth connecting pipe 19. The other end of the eighth connecting pipe 21 is fixedly connected to the adsorption inlet of the activated carbon adsorber 5. The adsorption outlet of the activated carbon adsorber 5 is fixedly connected to the inlet of the adsorption fan 6 through the ninth connecting pipe 22. The outlet of the adsorption fan 6 is fixedly connected to the exhaust stack 7 through the tenth connecting pipe 23.

[0028] Preferably, the desorption outlet of the activated carbon adsorber 5 is fixedly connected to the hot-side inlet of the second heat recovery heat exchanger 8 via the eleventh connecting pipe 24; the hot-side outlet of the second heat recovery heat exchanger 8 is fixedly connected to the inlet of the second VOCs condenser 9 via the twelfth connecting pipe 25; the outlet of the second VOCs condenser 9 is fixedly connected to the inlet of the second gas-liquid separator 10 via the thirteenth connecting pipe 26; the outlet of the second gas-liquid separator 10 is fixedly connected to the inlet of the second three-way regulating valve 37 via the fourteenth connecting pipe 27; and one outlet of the second three-way regulating valve 37 is connected to the second heat recovery heat exchanger 8 via the fifteenth connecting pipe 28. The cold-side inlet of the heat recovery heat exchanger 8 is fixedly connected. The other outlet of the second three-way regulating valve 37 is fixedly connected through the seventeenth connecting pipe 30 and the eighteenth connecting pipe 31. The cold-side outlet of the second heat recovery heat exchanger 8 is fixedly connected through the sixteenth connecting pipe 29 and the eighteenth connecting pipe 31. The other end of the eighteenth connecting pipe 31 is fixedly connected to the inlet of the desorption fan 11. The outlet of the desorption fan 11 is fixedly connected to the inlet of the inert gas heater 12 through the nineteenth connecting pipe 32. The outlet of the inert gas heater 12 is fixedly connected to the desorption inlet of the activated carbon adsorber 5 through the twentieth connecting pipe 33.

[0029] Preferably, a first temperature sensor 34 is provided on the fifth connecting pipe 18, and a second temperature sensor 36 is provided on the fifteenth connecting pipe 28.

[0030] Preferably, both the first three-way regulating valve 35 and the second three-way regulating valve 37 are configured as stepless regulating valves, and the anti-clogging VOCs closed-loop recovery module operates during off-peak electricity hours at night.

[0031] Preferably, it also includes a solvent storage tank 13, in which the liquid VOCs recovered by the anti-clogging VOCs pre-condensation module and the anti-clogging VOCs closed-loop recovery module are stored.

[0032] Preferably, the activated carbon adsorber 5 includes multiple adsorption tanks in the adsorption state and one adsorption tank in the desorption state, and the activated carbon used includes, but is not limited to, granular activated carbon, fiber activated carbon and honeycomb activated carbon.

[0033] This invention can be used for the purification and recovery of high-concentration VOCs such as exhaust gas from breather valves of solvent storage tanks and oil and gas storage tanks, and exhaust gas from reaction vessels;

[0034] For high-concentration VOCs exhaust, the anti-clogging VOCs pre-condensation module can efficiently recover most of the VOCs. The anti-clogging VOCs pre-condensation module is equipped with a device to prevent liquid from freezing and clogging. The remaining non-condensable gases are purified by the activated carbon adsorption purification module. The anti-clogging VOCs pre-condensation module at the front end of the entire device not only recovers most of the VOCs but also reduces the adsorption burden on the activated carbon adsorption purification module. The activated carbon adsorption purification module at the back end ensures that the exhaust VOCs concentration meets the emission standards.

[0035] The saturated activated carbon is desorbed using a closed-loop VOCs recovery module to regenerate the activated carbon and recover VOCs. The first heat recovery heat exchanger 2 and the second heat recovery heat exchanger 8 not only recover energy but also recover most of the substances that are prone to freezing, thus achieving the functions of recovering cold energy, removing "water", and preventing clogging.

[0036] Please see Figure 1 The present invention provides a second embodiment:

[0037] A method for recovering high-concentration VOCs without clogging includes the following steps:

[0038] When the anti-clogging VOCs pre-condensation module and the adsorption purification module are running, if the temperature displayed by the first temperature sensor 34 is lower than the threshold temperature, the opening of the first three-way regulating valve 35 is adjusted to increase the branch flow of the seventh connecting pipe 20 and decrease the branch flow of the fifth connecting pipe 18; if the temperature displayed by the first temperature sensor 34 is higher than the threshold temperature, the opening of the first three-way regulating valve 35 is adjusted to decrease the branch flow of the seventh connecting pipe 20 and increase the branch flow of the fifth connecting pipe 18, so that the temperature at the first temperature sensor 34 is always near the threshold temperature.

[0039] When the anti-clogging closed-loop VOCs recovery module is running, if the temperature displayed by the second temperature sensor 36 is lower than the threshold temperature, the opening of the second three-way regulating valve 37 is adjusted to increase the flow rate of the branch of the seventeenth connecting pipe 30 and decrease the flow rate of the branch of the fifteenth connecting pipe 28; if the temperature displayed by the second temperature sensor 36 is higher than the threshold temperature, the opening of the second three-way regulating valve 37 is adjusted to decrease the flow rate of the branch of the seventeenth connecting pipe 30 and increase the flow rate of the branch of the fifteenth connecting pipe 28, so that the temperature at the second temperature sensor 36 is always near the threshold temperature.

[0040] Preferably, the temperature sensor 36 detects a temperature threshold 2-3°C higher than the freezing point of the easily icing components in the organic exhaust gas, and the hot-side inlet temperature of the first heat recovery heat exchanger 2 is the same as the highest temperature under operating conditions.

[0041] Please see Figure 1 The present invention provides a third embodiment:

[0042] When the solvent storage tank exhausts air through the breather valve, the exhaust volume is 200 m³ / h, the VOCs concentration is 15000 mg / m³, and the exhaust temperature is 10-40℃; the exhaust volume of the paint spraying booth is 90000 m³ / h, the VOCs concentration is 300 mg / m³, and the exhaust temperature is 30℃.

[0043] The components with higher concentrations are known to be water, No. 100 aromatic solvent oil, n-butanol, and dimethylethanolamine, each accounting for 15%, totaling 60%; followed by ethylene glycol monobutyl ether, styrene, acrylic acid, methacrylic acid, methyl methacrylate, and No. 150 aromatic solvent oil, each accounting for 5%, totaling 30%; other components have lower concentrations, accounting for 10% each.

[0044] Water in the exhaust gas is a substance that easily freezes, with a freezing point of 0℃, and the threshold temperature is set at 2-3℃. The exhaust gas temperature is 10-40℃, and 40℃ is used as the hot-side inlet temperature of the first heat recovery heat exchanger 2 for design. Based on the saturation pressure curve of the exhaust gas components, the pre-condensation temperature is designed to be -50℃. After pre-condensation, the VOCs concentration is ≤3500mg / m³, which significantly reduces the adsorption burden on activated carbon. If activated carbon is not used for adsorption, the pre-condensation temperature needs to be below -90℃ if emissions meet the standards. The solution in this case significantly reduces condensation energy consumption.

[0045] When the exhaust temperature drops, the temperature at the first temperature sensor 34 also drops. Therefore, it is necessary to adjust the opening of the first three-way regulating valve 35, increase the branch flow of the seventh connecting pipe 20, and decrease the branch flow of the fifth connecting pipe 18. When the exhaust temperature rises, the temperature at the first temperature sensor 34 also rises. Therefore, it is necessary to adjust the opening of the first three-way regulating valve 35, decrease the branch flow of the seventh connecting pipe 20, and increase the branch flow of the fifth connecting pipe 18. Most of the water condenses into liquid in the first heat recovery heat exchanger 2, and prevents the liquid water from freezing.

[0046] When activated carbon adsorption is saturated, inert gas is used as the carrier gas to achieve desorption of activated carbon and regeneration of VOCs through a closed-loop VOCs recovery module to prevent clogging. A second temperature sensor 36 and a second three-way regulating valve 37 are configured at the back end of the second heat recovery heat exchanger 8, where most of the water is condensed and ice formation is prevented through temperature control.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A clog-resistant high concentration VOCs recovery device, characterized by: The anti-blocking VOCs pre-condensing module, the activated carbon adsorption purification module and the anti-blocking VOCs closed recycling module are fixedly connected. The anti-blocking VOCs pre-condensing device comprises a first heat recovery heat exchanger (2), a first VOCs condenser (3) and a first gas-liquid separator (4), the activated carbon purification module comprises an activated carbon adsorber (5), an adsorption fan (6) and an exhaust cylinder (7), and the anti-blocking VOCs closed recycling module comprises a second heat recovery heat exchanger (8), a second VOCs condenser (9), a second gas-liquid separator (10), a desorption fan (11) and an inert gas heater (12). The high-concentration VOCs source (1) is fixedly connected with the hot side inlet of the first heat recovery heat exchanger (2) through a first connecting pipe (14), the hot side outlet of the first heat recovery heat exchanger (2) is fixedly connected with the inlet of the first VOCs condenser (3) through a second connecting pipe (15), the outlet of the first VOCs condenser (3) is fixedly connected with the inlet of the first gas-liquid separator (4) through a third connecting pipe (16), the outlet of the first gas-liquid separator (4) is fixedly connected with the inlet of a first three-way regulating valve (35) through a fourth connecting pipe (17), one outlet of the first three-way regulating valve (35) is fixedly connected with the cold side inlet of the first heat recovery heat exchanger (2) through a fifth connecting pipe (18), the other outlet of the first three-way regulating valve (35) is fixedly connected with the eighth connecting pipe (21) through a seventh connecting pipe (20), the cold side outlet of the first heat recovery heat exchanger (2) is fixedly connected with the eighth connecting pipe (21) through a sixth connecting pipe (19), the other end of the eighth connecting pipe (21) is fixedly connected with the adsorption inlet of the activated carbon adsorber (5), the adsorption outlet of the activated carbon adsorber (5) is fixedly connected with the inlet of the adsorption fan (6) through a ninth connecting pipe (22), and the outlet of the adsorption fan (6) is fixedly connected with the exhaust cylinder (7) through a tenth connecting pipe (23). The desorption outlet of the activated carbon adsorber (5) is fixedly communicated with the hot side inlet of the second heat recovery heat exchanger (8) through the eleventh connecting pipe (24), the hot side outlet of the second heat recovery heat exchanger (8) is fixedly communicated with the inlet of the second VOCs condenser (9) through the twelfth connecting pipe (25), the outlet of the second VOCs condenser (9) is fixedly communicated with the inlet of the second gas-liquid separator (10) through the thirteenth connecting pipe (26), the outlet of the second gas-liquid separator (10) is fixedly communicated with the inlet of the second three-way regulating valve (37) through the fourteenth connecting pipe (27), one outlet of the second three-way regulating valve (37) is fixedly communicated with the cold side inlet of the second heat recovery heat exchanger (8) through the fifteenth connecting pipe (28), the other outlet of the second three-way regulating valve (37) is fixedly communicated through the seventeenth connecting pipe (30) and the eighteenth connecting pipe (31), the cold side outlet of the second heat recovery heat exchanger (8) is fixedly communicated with the eighteenth connecting pipe (31) through the sixteenth connecting pipe (29), the other end of the eighteenth connecting pipe (31) is fixedly communicated with the inlet of the desorption fan (11), the outlet of the desorption fan (11) is fixedly communicated with the inlet of the inert gas heater (12) through the nineteenth connecting pipe (32), and the outlet of the inert gas heater (12) is fixedly communicated with the desorption inlet of the activated carbon adsorber (5) through the twentieth connecting pipe (33). The first temperature sensor (34) is arranged on the fifth connecting pipe (18), and the second temperature sensor (36) is arranged on the fifteenth connecting pipe (28).

2. The anti-clogging high concentration VOCs recovery device according to claim 1, characterized in that: The first three-way regulating valve (35) and the second three-way regulating valve (37) are both arranged as stepless regulating valves, and the anti-blocking VOCs closed recovery module operates during night valley electricity.

3. The anti-clogging high concentration VOCs recovery device according to claim 2, characterized in that: A solvent temporary storage tank (13) is further included, and the liquid VOCs recovered by the anti-blocking VOCs pre-condensation module and the anti-blocking closed VOCs recovery module are stored in the solvent temporary storage tank (13).

4. The anti-clogging high concentration VOCs recovery device according to claim 3, characterized in that: The activated carbon adsorber (5) includes a plurality of adsorption tanks in an adsorption state and one adsorption tank in a desorption state, and the activated carbon includes but is not limited to granular activated carbon, fibrous activated carbon and honeycomb activated carbon.

5. The anti-clogging high-concentration VOCs recovery method using the anti-clogging high-concentration VOCs recovery device according to claim 4, characterized by: The method comprises the following steps: When the anti-blocking VOCs pre-condensation module and the adsorption purification module operate, when the first temperature sensor (34) displays that the temperature is lower than a threshold temperature, the opening degree of the first three-way regulating valve (35) is adjusted, the branch flow of the seventh connecting pipe (20) is increased, and the branch flow of the fifth connecting pipe (18) is reduced; when the first temperature sensor (34) displays that the temperature is higher than the threshold temperature, the opening degree of the first three-way regulating valve (35) is adjusted, the branch flow of the seventh connecting pipe (20) is reduced, and the branch flow of the fifth connecting pipe (18) is increased, so that the temperature at the first temperature sensor (34) is always around the threshold temperature. When the anti-clogging closed VOCs recovery module is running, the opening of the second three-way regulating valve (37) is adjusted to increase the branch flow of the seventeenth connecting pipe (30) and reduce the branch flow of the fifteenth connecting pipe (28) when the second temperature sensor (36) shows that the temperature is lower than the threshold temperature; the opening of the second three-way regulating valve (37) is adjusted to reduce the branch flow of the seventeenth connecting pipe (30) and increase the branch flow of the fifteenth connecting pipe (28) when the second temperature sensor (36) shows that the temperature is higher than the threshold temperature, so that the temperature at the second temperature sensor (36) is always around the threshold temperature.

6. The anti-clogging high concentration VOCs recovery method according to claim 5, characterized in that: The detection temperature threshold of the first temperature sensor (34) and the second temperature sensor (36) is 2-3℃ higher than the freezing point temperature of the easily frozen components in the organic exhaust gas, and the inlet temperature of the hot side of the first heat recovery heat exchanger (2) is the same as the highest temperature of the working condition.

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