Volatile organic compound recovery system

Abstract

The application provides a volatile organic compound recovery system, which comprises a shunting unit, the shunting unit comprising a first shunting device, an air inlet pipeline, a first air outlet pipeline and a second air outlet pipeline; one end of the air inlet pipeline is used for being connected with exhaust gas, and the other end is respectively connected with the first air outlet pipeline and the second air outlet pipeline; the first shunting device is installed on the first air outlet pipeline and the second air outlet pipeline; a condensing unit, the condensing unit comprising an energy conversion device, a refrigeration device and a heat exchanger; the heat exchanger is provided with a hot runner, and the second air outlet pipeline is connected with the hot runner; the first air outlet pipeline is connected with the energy conversion device, the energy conversion device is connected with the refrigeration device, the refrigeration device is connected with the heat exchanger, and the exhaust gas in the first air outlet pipeline is used for providing a refrigeration energy source for the refrigeration device. The volatile organic compound recovery system provided by the application can realize self-powered operation, and does not need external power input or reduces the demand for external power input.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste gas treatment, and in particular to a volatile organic compound recovery system. BACKGROUND

[0002] In the process of treating industrial waste gas, a condensation method is often used to recover volatile organic compounds in the waste gas. The traditional condensation method generally needs to consume electricity to maintain refrigeration. In remote oil fields, ocean liners and other scenarios, electricity is scarce, and it may be difficult to maintain the consumption of the condensation method, or the cost of maintaining the consumption of the condensation method is too high. SUMMARY

[0003] The present application provides a volatile organic compound recovery system to solve the defects that the condensation method for recovering volatile organic compounds is difficult to be used in a power shortage scenario or has a high use cost in the prior art.

[0004] The present application provides a volatile organic compound recovery system, comprising a shunt unit, the shunt unit comprising a first shunt device, an air inlet pipeline, a first air outlet pipeline and a second air outlet pipeline; one end of the air inlet pipeline is used for communication with waste gas, and the other end is respectively communicated with the first air outlet pipeline and the second air outlet pipeline; the first shunt device is installed on the first air outlet pipeline and the second air outlet pipeline; a condensation unit, the condensation unit comprising an energy conversion device, a refrigeration device and a heat exchanger; the heat exchanger is provided with a hot runner, and the second air outlet pipeline is communicated with the hot runner; the first air outlet pipeline is communicated with the energy conversion device, the energy conversion device is connected to the refrigeration device, the refrigeration device is connected to the heat exchanger, and the waste gas in the first air outlet pipeline is used to provide a refrigeration energy source for the refrigeration device.

[0005] According to the volatile organic compound recovery system provided by the present application, the energy conversion device comprises a gas power generation device, the refrigeration device comprises an electrically driven refrigerator, and the gas power generation device is connected to the electrically driven refrigerator.

[0006] According to the volatile organic compound recovery system provided by the present application, the energy conversion device further comprises a combustion chamber, the refrigeration device further comprises a heat-driven refrigerator, and the combustion chamber is connected to the heat-driven refrigerator.

[0007] According to the volatile organic compound recovery system provided by the present application, the shunt unit further comprises a second shunt device; the first air outlet pipeline is provided with a first branch and a second branch, the first branch is connected to the combustion chamber, the second branch is connected to the gas power generation device, and the second shunt device is installed on the first branch and the second branch.

[0008] The volatile organic compound recovery system provided by the present application, the heat exchanger comprises a first heat exchanger and a second heat exchanger, the first heat exchanger is connected to the heat-driven refrigerator, the second heat exchanger is connected to the electric-driven refrigerator, and the refrigeration temperature of the second heat exchanger is lower than that of the first heat exchanger; the second gas outlet pipeline is communicated with the hot runner of the first heat exchanger, and the hot runners of the first heat exchanger and the second heat exchanger are communicated.

[0009] The volatile organic compound recovery system provided by the present application, the heat exchanger further comprises a third heat exchanger, the refrigeration temperature of the third heat exchanger is higher than that of the first heat exchanger; the second gas outlet pipeline is communicated with the hot runner of the third heat exchanger, and the hot runner of the third heat exchanger is communicated with the hot runner of the first heat exchanger.

[0010] The volatile organic compound recovery system provided by the present application, the third heat exchanger is further provided with a cold runner; the hot runner of the second heat exchanger is communicated with the cold runner of the third heat exchanger, and the cold runner of the third heat exchanger is communicated with the outside.

[0011] The volatile organic compound recovery system provided by the present application, the condensing unit further comprises a gas-liquid separation device and a condensate recovery device; the gas-liquid separation device corresponds to the heat exchanger one by one, the gas-liquid separation device is communicated with the heat exchanger downstream relative to the second gas outlet pipeline, and the gas-liquid separation device is communicated with the condensate recovery device.

[0012] The volatile organic compound recovery system provided by the present application, the electric-driven refrigerator is a Stirling refrigerator.

[0013] The volatile organic compound recovery system provided by the present application, the heat-driven refrigerator is an absorption refrigerator, a vapor injection refrigerator or a thermoacoustic refrigerator.

[0014] The volatile organic compound recovery system provided by the present application, the waste gas is divided by the shunt unit, part of the waste gas is used as an energy source, the energy conversion device is used to supply energy to the refrigeration device by using the part of the waste gas, so as to maintain the refrigeration temperature of the heat exchanger, and the other part of the waste gas flows into the heat exchanger and is condensed and recovered by heat exchange. Thus, the volatile organic compound provided by the present application can be self-sustained by self-energy supply, or the demand for external function can be reduced by self-energy supply. In the case of power shortage, no power or high power cost, such as remote oil field, ocean liner, etc., the device can be self-operated without relying on power input or reducing the demand and cost of external power input. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to make the technical solutions in the present application or the prior art clearer, the accompanying drawings needed in the embodiments or the prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative work based on these drawings also belong to the protection scope of the present application.

[0016] Figure 1 is a structural schematic diagram of a volatile organic compound recovery system provided by the present application.

[0017] Reference signs:

[0018] 1: air inlet pipeline; 2: first air outlet pipeline; 3: second air outlet pipeline; 4: air blower; 5: first regulating valve; 6: second regulating valve; 7: first branch; 8: second branch; 9: third regulating valve; 10: fourth regulating valve; 11: combustion chamber; 12: gas power generation device; 13: heat-driven refrigerator; 131: heat end of heat-driven refrigerator; 132: cold end of heat-driven refrigerator; 14: electric-driven refrigerator; 141: hot end of electric-driven refrigerator; 142: cold end of electric-driven refrigerator; 15: first heat exchanger; 16: second heat exchanger; 17: third heat exchanger; 18: first gas-liquid separation device; 19: second gas-liquid separation device; 20: third gas-liquid separation device; 21: condensate recovery device; 22: exhaust gas outlet. DETAILED DESCRIPTION

[0019] In order to make the technical solutions in the present application or the prior art clearer, the accompanying drawings needed in the embodiments or the prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative work based on these drawings also belong to the protection scope of the present application.

[0020] The present application provides a volatile organic compound recovery system, comprising a shunting unit and a condensing unit.

[0021] The shunting unit comprises a first shunting device, an air inlet pipeline 1, a first air outlet pipeline 2 and a second air outlet pipeline 3. One end of the air inlet pipeline 1 is used for being communicated with exhaust gas, and the other end is respectively communicated with the first air outlet pipeline 2 and the second air outlet pipeline 3; the first shunting device is installed on the first air outlet pipeline 2 and the second air outlet pipeline 3.

[0022] And, the condensing unit comprises an energy conversion device, a refrigeration device and a heat exchanger; the heat exchanger is provided with a hot runner, and the second gas outlet pipeline 3 is communicated with the hot runner; the first gas outlet pipeline 2 is communicated with the energy conversion device, the energy conversion device is connected to the refrigeration device, the refrigeration device is connected to the heat exchanger, and the waste gas in the first gas outlet pipeline 2 is used to provide a refrigeration energy source for the refrigeration device.

[0023] As shown in Figure 1 , the first shunt device can comprise a first regulating valve 5 and a second regulating valve 6. The first end of the gas inlet pipeline 1 is communicated with the waste gas source, and the driving device is installed on the gas inlet pipeline 1 to drive the waste gas to flow into the gas inlet pipeline 1. Among them, the driving device can be a gas pump or a fan and the like. For example, as shown in Figure 1 , the driving device is a blower 4.

[0024] The second end of the gas inlet pipeline 1 is connected to the first gas outlet pipeline 2 and the second gas outlet pipeline 3 respectively, so that the waste gas flows into the first gas outlet pipeline 2 and the second gas outlet pipeline 3 respectively. The shunt device is installed on the first gas outlet pipeline 2 and the second gas outlet pipeline 3 to adjust the flow ratio of the waste gas flowing into the first gas outlet pipeline 2 and the second gas outlet pipeline 3 respectively. For example, the shunt device comprises a first regulating valve 5 and a second regulating valve 6, the first regulating valve 5 is installed on the first gas outlet pipeline 2, and the second regulating valve 6 is installed on the second gas outlet pipeline 3.

[0025] The waste gas in the first gas outlet pipeline 2 and the second gas outlet pipeline 3 enters the condensing unit respectively and produces different effects. Among them, the first gas outlet pipeline 2 is communicated with the energy conversion device, which is used to provide energy for the energy conversion device. The energy conversion device can be a gas power generation device 12 or a combustion chamber 11 and the like, which converts the waste gas into electric energy, thermal energy, chemical energy or mechanical energy and the like through different conversion modes. Correspondingly, the energy conversion device is connected to the refrigeration device, and the energy obtained by the energy conversion device is used to power the refrigeration device. It can be understood that the hot end of the refrigeration device is connected to the energy conversion device, and the cold end is connected to the heat exchanger, and the refrigeration device provides cold energy for the heat exchanger.

[0026] On the basis of the waste gas provided by the first gas outlet pipeline 2 as the energy source, the heat exchanger obtains a lower refrigeration temperature. The heat exchanger is provided with a hot runner, and the second gas outlet pipeline 3 is communicated with the hot runner of the heat exchanger, so that the waste gas in the second gas outlet pipeline 3 flows into the hot runner of the heat exchanger, and the impurities such as volatile organic compounds therein are removed by condensation. The hot runner of the heat exchanger is communicated with the waste gas exhaust port 22, and the clean waste gas after condensation can be discharged from the waste gas exhaust port 22 to the outdoor.

[0027] The volatile organic compound system provided by the application divides the exhaust gas through a diversion unit, so that part of the exhaust gas serves as an energy source, and the energy conversion device utilizes the part of the exhaust gas to supply energy to the refrigeration device to maintain the refrigeration temperature of the heat exchanger, and the other part of the exhaust gas flows into the heat exchanger to recover the volatile organic compounds therein through heat exchange and condensation. Therefore, the volatile organic compound provided by the application can be self-sustained in operation through self-energy supply, or the demand for external functions can be reduced through self-energy supply, and in places such as remote oil fields, ocean liners and the like where power is scarce, there is no power or the cost of power is high, the system can be self-operated without relying on power input or the demand and cost of external power input can be reduced.

[0028] Among them, it can be understood that the heat exchanger of the condensing unit can include multiple heat exchangers, and the heat flow channels of the multiple heat exchangers are sequentially connected, and the second gas outlet pipeline 3 is connected to the first heat exchanger among the multiple heat exchangers, so that the exhaust gas sequentially flows through each heat exchanger, and after multiple condensations, the clean exhaust gas is discharged to the outdoor through the exhaust gas outlet 22. Among them, the refrigeration temperature of each heat exchanger should be sequentially reduced along the flow direction of the exhaust gas.

[0029] Among them, further, the energy conversion device and the refrigeration device of the condensing unit can also include multiple types, wherein different energy conversion devices are used to convert the chemical energy in the exhaust gas into different forms of energy, such as heat energy, electric energy, etc.; different refrigeration devices are driven by different forms of energy to refrigerate, such as electrically driven refrigeration, heat driven refrigeration, etc. And the energy forms of multiple energy conversion devices and multiple refrigeration devices are matched one by one, and each energy conversion device is connected to the corresponding refrigeration device.

[0030] For example, in some embodiments of the application, the energy conversion device includes a gas turbine power generation set 12, and the refrigeration device includes an electrically driven refrigerator 14, and the gas turbine power generation set 12 is connected to the electrically driven refrigerator 14.

[0031] It can be understood that the gas turbine power generation set 12 can be a gas turbine power generation set, and the gas turbine power generation set 12 converts the chemical energy of the exhaust gas provided by the first gas outlet pipeline 2 into electric energy to supply power to the electrically driven refrigerator 14.

[0032] Among them, optionally, the electrically driven refrigerator 14 is a Stirling refrigerator.

[0033] In other embodiments, the energy conversion device includes a combustion chamber 11, and the refrigeration device further includes a heat driven refrigerator 13, and the combustion chamber 11 is connected to the heat driven refrigerator 13.

[0034] It can be understood that the exhaust gas in the first gas outlet pipeline 2 enters the combustion chamber 11 and burns in the combustion chamber 11, so that the chemical energy in the exhaust gas is converted into heat energy to provide an energy source for the heat driven refrigerator 13.

[0035] Optionally, the heat-driven refrigerator 13 can be an absorption refrigerator, a steam jet refrigerator, or a thermoacoustic refrigerator.

[0036] In some other embodiments, the energy conversion device includes both a gas-fired power generation unit 12 and a combustion chamber 11, and the refrigeration device includes both a thermally driven refrigerator 13 and an electrically driven refrigerator 14. The gas-fired power generation unit 12 is connected to the electrically driven refrigerator 14, and the combustion chamber 11 is connected to the thermally driven refrigerator 13.

[0037] Based on the above embodiments, it can be understood that the first exhaust pipe 2 is also provided with branches, each branch corresponding to an energy conversion device, and each branch is connected to an energy conversion device to provide exhaust gas to an energy conversion device.

[0038] For example, in some embodiments, the diversion unit further includes a second diversion device. The first gas outlet pipe 2 is provided with a first branch 7 and a second branch 8. The first branch 7 is connected to the combustion chamber 11, the second branch 8 is connected to the gas generator 12, and the second diversion device is installed on the first branch 7 and the second branch 8.

[0039] like Figure 1 As shown, the second diversion device may include a third regulating valve 9 and a fourth regulating valve 10. The third regulating valve 9 is installed on the first branch 7, and the fourth regulating valve 10 is installed on the second branch 8.

[0040] The second diversion device is used to adjust the flow ratio of exhaust gas in the first outlet pipe 2 into the first branch 7 and into the second branch 8. The exhaust gas flowing into the first branch 7 flows into the combustion chamber 11, providing an energy source for the thermally driven chiller 13, while the exhaust gas flowing into the second branch 8 flows into the gas-fired power generation unit 12, providing an energy source for the electrically driven chiller 14. The cooling capacity of the thermally driven chiller 13 and the electrically driven chiller 14 can be controlled through the second diversion device.

[0041] Based on the above embodiments, optionally, the number of heat exchangers is equal to the number of energy conversion devices and refrigeration devices, and a group of interconnected energy conversion devices and refrigeration devices are used to cool one heat exchanger.

[0042] For example, in some embodiments, the heat exchanger includes a first heat exchanger 15 and a second heat exchanger 16. The first heat exchanger 15 is connected to a heat-driven refrigerator 13, and the second heat exchanger 16 is connected to an electric-driven refrigerator 14. The cooling temperature of the second heat exchanger 16 is lower than the cooling temperature of the first heat exchanger 15. A second exhaust pipe 3 is connected to the hot runner of the first heat exchanger 15, and the hot runners of the first heat exchanger 15 and the second heat exchanger 16 are connected.

[0043] like Figure 1As shown, the hot end 131 of the heat-driven refrigerator is connected to the combustion chamber 11, and the cold end 132 of the heat-driven refrigerator is connected to the first heat exchanger 15. The hot end 141 of the electric-driven refrigerator is connected to the gas power generation device 12, and the cold end 142 of the electric-driven refrigerator is connected to the second heat exchanger 16. Since the lowest temperature that can be reached by the electric-driven refrigerator 14 is lower than that of the heat-driven refrigerator 13, the refrigeration temperature of the second heat exchanger 16 can be controlled to be lower than that of the first heat exchanger 15.

[0044] In the above embodiment, the first heat exchanger 15 and the second heat exchanger 16 are preferably in the form of gas-solid heat exchange, and can also be in the form of heat exchange with intermediate refrigerant. In some embodiments, the refrigerant of the first heat exchanger 15 can be ammonia water or lithium bromide aqueous solution, and the refrigerant of the second heat exchanger 16 can be helium.

[0045] In the above embodiment, the first heat exchanger 15 and the second heat exchanger 16 can be in the form of a partitioned heat exchanger, and preferably, the first heat exchanger 15 and the second heat exchanger 16 are in the form of a tube-fin heat exchanger.

[0046] The exhaust gas in the second gas outlet pipeline 3 first flows into the first heat exchanger 15, and after removing part of the volatile organic compounds through condensation in the first heat exchanger 15, the exhaust gas flows from the hot runner of the first heat exchanger 15 into the hot runner of the second heat exchanger 16, and after removing part of the volatile organic compounds again through condensation in the second heat exchanger 16, the clean exhaust gas is discharged into the outside through the exhaust gas outlet 22.

[0047] In some embodiments of the present application, the heat exchanger further comprises a third heat exchanger 17, and the refrigeration temperature of the third heat exchanger 17 is higher than that of the first heat exchanger 15. The second gas outlet pipeline 3 is connected to the hot runner of the third heat exchanger 17, and the hot runner of the third heat exchanger 17 is connected to the hot runner of the first heat exchanger 15.

[0048] It can be understood that the refrigeration temperatures of the third heat exchanger 17, the first heat exchanger 15 and the second heat exchanger 16 decrease in turn, the third heat exchanger 17 can be used as a pre-cooling heat exchanger, the first heat exchanger 15 can be used as a medium-cooling heat exchanger, and the second heat exchanger 16 can be used as a deep-cooling heat exchanger.

[0049] The second gas outlet pipeline 3 is connected to the first heat exchanger 15 and the second heat exchanger 16 through the third heat exchanger 17. The exhaust gas in the second gas outlet pipeline 3 flows through the hot runners of the third heat exchanger 17, the first heat exchanger 15 and the second heat exchanger 16 in turn, and after three times of condensation, the clean exhaust gas flows from the hot runner of the second heat exchanger 16 to the exhaust gas outlet 22.

[0050] The third heat exchanger 17 can obtain cold energy in various ways. For example, the third heat exchanger 17 can obtain cold energy from external energy supply, or in some embodiments, the third heat exchanger 17 is provided with a cold flow channel. The hot flow channel of the second heat exchanger 16 is connected to the cold flow channel of the third heat exchanger 17, and the cold flow channel of the third heat exchanger 17 is connected to the outside.

[0051] It can be understood that the exhaust gas after condensation by the first heat exchanger 15 and the second heat exchanger 16 has a lower temperature than the refrigeration temperature of the third heat exchanger 17. Therefore, the hot flow channel of the second heat exchanger 16 can be connected to the exhaust gas outlet 22 through the cold flow channel of the third heat exchanger 17, and the clean exhaust gas condensed by the second heat exchanger 16 first flows into the cold flow channel of the third heat exchanger 17, and then flows from the cold flow channel of the third heat exchanger 17 into the exhaust gas outlet 22 and is discharged into the outside.

[0052] Therefore, the third heat exchanger 17 directly uses the clean exhaust gas after sufficient condensation as refrigerant, and the cold energy in the clean exhaust gas can be recovered. The exhaust gas discharged into the condensation unit through the second exhaust pipe 3 successively passes through the third heat exchanger 17, the first heat exchanger 15, the second heat exchanger 16 and the third heat exchanger 17 again and is discharged into the outside. In the third heat exchanger 17, the clean exhaust gas after sufficient condensation exchanges heat with the exhaust gas without condensation through the third heat exchanger 17, so as to use the cold energy of the clean exhaust gas after sufficient condensation to precool the exhaust gas without condensation.

[0053] The third heat exchanger 17 is a partition heat exchanger, and preferably, the third heat exchanger 17 is a tube-shell heat exchanger.

[0054] The volatile organic compound recovery system provided by the embodiment of the present application has a three-stage condensation structure, and the third heat exchanger 17 fully recovers cold energy. The first heat exchanger 15 can remove water in the exhaust gas by controlling the refrigeration temperature, and condenses and recovers most of the volatile organic compounds. The second heat exchanger 16 further ensures that the concentration of volatile organic compounds in the clean exhaust gas meets the emission requirements by controlling the refrigeration temperature.

[0055] On the basis of the above-mentioned embodiment, it can be understood that the condensation unit further comprises a gas-liquid separation device and a condensate recovery device 21. The gas-liquid separation device corresponds to the heat exchanger one by one, and the gas-liquid separation device is connected to the downstream of the heat exchanger relative to the second exhaust pipe 3. The gas-liquid separation device is connected to the condensate recovery device 21.

[0056] It can be understood that the condensation unit of the volatile organic compound recovery system provided by the present application can comprise one or more heat exchangers, and the multiple heat exchangers are respectively provided with cold energy by multiple groups of energy conversion devices and refrigeration devices connected to each other. The hot flow channels of the multiple heat exchangers are connected in sequence, and the exhaust gas in the second exhaust pipe 3 successively passes through the hot flow channels of the multiple heat exchangers and is gradually condensed.

[0057] Thus, the gas-liquid separation device corresponds one-to-one with the heat exchanger, and a gas-liquid separation device is installed downstream of each heat exchanger. Multiple heat exchangers and multiple gas-liquid separation devices are connected in series alternately.

[0058] Furthermore, each gas-liquid separation device is connected to the condensate recovery device 21. Specifically, each gas-liquid separation device has a gas-liquid mixture inlet, a gas outlet, and a liquid outlet. The liquid outlet of each gas-liquid separation device is connected to the condensate recovery device 21, the gas-liquid mixture inlet is connected to the corresponding heat exchanger, and the gas outlet is connected to the downstream heat exchanger. Thus, the waste gas in the second outlet pipeline 3 passes through each heat exchanger sequentially, and the volatile organic compounds and other impurities are condensed to form condensate. The condensate is collected in the condensate recovery device 21 through the liquid outlet of the gas-liquid separation device downstream of the heat exchanger, and the remaining waste gas flows into the hot runner of the next heat exchanger through the gas outlet of the gas-liquid separation device downstream of the heat exchanger.

[0059] Specifically, such as Figure 1 As shown, in one embodiment, the heat exchanger includes a third heat exchanger 17, a first heat exchanger 15, and a second heat exchanger 16. The gas-liquid separation device includes a third gas-liquid separation device 20, a first gas-liquid separation device 18, and a second gas-liquid separation device 19. A second outlet pipe 3 is connected to the third heat exchanger 17. The third gas-liquid separation device 20 is connected downstream of the third heat exchanger 17. The first heat exchanger 15 is connected downstream of the third heat exchanger 17. The first gas-liquid separation device 18 is connected downstream of the first heat exchanger 15. The second heat exchanger 16 is connected downstream of the first gas-liquid separation device 18. The second gas-liquid separation device 19 is connected downstream of the second heat exchanger 16, and the downstream of the second gas-liquid separation device 19 is connected back to the cold flow channel of the third heat exchanger 17. The downstream of the cold flow channel is connected to the exhaust port 22.

[0060] Furthermore, the liquid outlets of the first gas-liquid separation device 18, the second gas-liquid separation device 19, and the third gas-liquid separation device 20 are all connected to the condensate recovery device 21.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A volatile organic compound (VOC) recovery system, characterized in that, include: The flow splitting unit includes a first flow splitting device, an intake pipe, a first outlet pipe, and a second outlet pipe; One end of the intake pipe is connected to the exhaust gas, and the other end is connected to the first exhaust pipe and the second exhaust pipe respectively; The first diversion device is installed in the first outlet pipe and the second outlet pipe; A condensing unit includes an energy conversion device, a refrigeration device, and a heat exchanger; the heat exchanger is provided with a hot runner, and a second outlet pipe is connected to the hot runner; the first outlet pipe is connected to the energy conversion device, the energy conversion device is connected to the refrigeration device, the refrigeration device is connected to the heat exchanger, and the waste gas in the first outlet pipe is used to provide a cooling energy source for the refrigeration device. The energy conversion device includes a gas-fired power generation device, and the refrigeration device includes an electrically driven refrigerator, with the gas-fired power generation device connected to the electrically driven refrigerator; The energy conversion device further includes a combustion chamber, and the refrigeration device further includes a heat-driven refrigerator, with the combustion chamber connected to the heat-driven refrigerator; The diversion unit further includes a second diversion device; The first gas outlet pipeline has a first branch and a second branch. The first branch is connected to the combustion chamber, the second branch is connected to the gas-fired power generation device, and the second diversion device is installed on the first branch and the second branch. The heat exchanger includes a first heat exchanger and a second heat exchanger. The first heat exchanger is connected to the heat-driven refrigerator, and the second heat exchanger is connected to the electric-driven refrigerator. The cooling temperature of the second heat exchanger is lower than that of the first heat exchanger. The second outlet pipe is connected to the hot flow channel of the first heat exchanger, and the hot flow channels of the first heat exchanger and the second heat exchanger are connected.

2. The volatile organic compound recovery system according to claim 1, characterized in that, The heat exchanger also includes a third heat exchanger, the cooling temperature of which is higher than that of the first heat exchanger; The second outlet pipe is connected to the hot flow channel of the third heat exchanger, and the hot flow channel of the third heat exchanger is connected to the hot flow channel of the first heat exchanger.

3. The volatile organic compound recovery system according to claim 2, characterized in that, The third heat exchanger is also provided with a cold flow channel; The hot flow channel of the second heat exchanger is connected to the cold flow channel of the third heat exchanger, and the cold flow channel of the third heat exchanger is connected to the outside.

4. The volatile organic compound recovery system according to claim 1, characterized in that, The condensation unit also includes a gas-liquid separation device and a condensate recovery device; The gas-liquid separation device corresponds one-to-one with the heat exchanger. The gas-liquid separation device is connected downstream of the heat exchanger relative to the second gas outlet pipeline. The gas-liquid separation device is also connected to the condensate recovery device.

5. The volatile organic compound recovery system according to claim 1, characterized in that, The electrically driven refrigeration unit is a Stirling refrigeration unit.

6. The volatile organic compound recovery system according to claim 1, characterized in that, The heat-driven refrigeration machine is an absorption refrigeration machine, a steam jet refrigeration machine, or a thermoacoustic refrigeration machine.

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