A steam adsorption-desorption condensation recovery system and method

Abstract

The present invention relates to the technical field of flue gas recovery, and particularly to a steam adsorption and desorption condensation recovery system and method. One end of the first activated carbon adsorber is connected to one interface of the first three-way connector. Another interface of the first three-way connector is connected to the seventh connecting pipe, and the last interface of the first three-way connector is connected to the third connecting pipe. The other end of the first activated carbon adsorber is connected to one interface of the second three-way connector. Another interface of the second three-way connector is connected to the first connecting pipe, and the last interface of the second three-way connector is connected to the fifth connecting pipe. The third connecting pipe is connected to the cooling system, and the cooling system is connected to the gas-liquid separator. In the present invention, the adsorbent in the saturated activated carbon adsorber is regenerated by low-pressure steam. The regenerated gas phase is collected in the gas-liquid separator after two-stage condensation by the cooling system. The condensate is discharged to the storage tank for recycling, and the desorbed non-condensable gas returns to the previous stage for continuous adsorption, and the solvent recovery without shutdown is realized.

Description

Technical Field

[0001] This invention patent relates to the technical field of flue gas recovery, and particularly relates to a steam adsorption-desorption condensation recovery system and method. Background Art

[0002] During industrial production processes, especially in fields such as chemical engineering, coatings, printing, and solvent recovery, waste gas often contains a large amount of organic solvent components. These organic solvents not only cause serious pollution to the environment but also pose a threat to human health. Therefore, how to effectively recover and treat organic solvents in waste gas has become an important topic in environmental protection and resource recycling. Traditional waste gas solvent recovery methods mainly include adsorption, condensation, washing, etc. The adsorption method usually uses adsorption materials such as activated carbon and molecular sieves to remove solvent components in waste gas through physical adsorption. However, due to the low recovery efficiency of solvents and the easy saturation of the adsorbent, it is necessary to replace or regenerate the adsorbent regularly. The condensation method condenses the solvent vapor into a liquid state by reducing the temperature to separate the solvent from the gas phase, which is applicable to the case where the solvent has strong volatility. However, in the existing technology, the adsorption efficiency is reduced because the adsorber needs to be shut down during solvent recovery. Summary of the Invention

[0003] The present invention provides a steam adsorption-desorption condensation recovery system.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A steam adsorption-desorption condensation recovery system includes a first activated carbon adsorber and a second activated carbon adsorber. One end of the first activated carbon adsorber is connected to an interface of a first three-way connector. Another interface of the first three-way connector is connected to a seventh connecting pipe, and the last interface of the first three-way connector is connected to a third connecting pipe. The other end of the first activated carbon adsorber is connected to an interface of a second three-way connector. Another interface of the second three-way connector is connected to a first connecting pipe, and the last interface of the second three-way connector is connected to a fifth connecting pipe. One end of the second activated carbon adsorber is connected to an interface of a third three-way connector. Another interface of the third three-way connector is connected to an eighth connecting pipe, and the last interface of the third three-way connector is connected to a fourth connecting pipe. The other end of the second activated carbon adsorber is connected to an interface of a fourth three-way connector. Another interface of the fourth three-way connector is connected to a second connecting pipe, and the last interface of the fourth three-way connector is connected to a sixth connecting pipe. The third connecting pipe and the fourth connecting pipe are connected to a cooling system, the cooling system is connected to a gas-liquid separator, the eighth connecting pipe is communicated with the seventh connecting pipe, the other end of the seventh connecting pipe is connected to the outlet end of a filter, the inlet end of the filter is connected to a pretreatment system, a first switching valve is installed on the seventh connecting pipe, a second switching valve is installed on the eighth connecting pipe, a third switching valve is installed on the fifth connecting pipe, a fourth switching valve is installed on the sixth connecting pipe, a fifth switching valve is installed on the first connecting pipe, a seventh switching valve is installed on the third connecting pipe, a sixth switching valve is installed on the second connecting pipe, and an eighth switching valve is installed on the fourth connecting pipe.

[0006] Further, the cooling system includes a first cooler and a second cooler. The third connecting pipe and the fourth connecting pipe are connected to the gas-phase inlet end of the first cooler. The gas-phase outlet end of the first cooler is connected to the gas-phase inlet end of the second cooler. The gas-phase outlet end of the second cooler is connected to the gas-liquid separator. The liquid phases of the first cooler and the second cooler are both connected to a circulating water system.

[0007] Further, the pretreatment system includes an alkali spray tower and a water spray tower. The inlet end of the filter is connected to one end of a tenth connecting pipe. The other end of the tenth connecting pipe is connected to the outlet end at the upper part of the water spray tower. The inlet end of the water spray tower is connected to one end of a first communicating pipe. The other end of the first communicating pipe is connected to the outlet end at the upper part of the alkali spray tower. The inlet of the alkali spray tower is connected to the waste gas end. The bottom of the alkali spray tower is connected to the inlet of a first circulating pump. The outlet of the first circulating pump is adjacently connected to a first spraying system at the upper part of the alkali spray tower. The bottom of the water spray tower is connected to the inlet of a second circulating pump. The outlet of the second circulating pump is connected to a second spraying system at the upper part of the water spray tower. The bottoms of the alkali spray tower and the water spray tower are both connected to a sewage system.

[0008] Furthermore, a second connecting pipe is provided between the alkali spray tower and the water spray tower.

[0009] Furthermore, the gas-liquid separator includes a cylinder body. One end of the cylinder body is fixedly connected to a first head, and the other end of the cylinder body is fixedly connected to a second head. An air inlet is provided on the first head. A support is fixed at the bottom of the cylinder body. The angle between the cylinder body and the horizontal plane through the support is 2-10°. A liquid outlet is provided at the lower part of the cylinder body, and a gas outlet is provided at the upper part of the cylinder body. A first baffle plate and a second baffle plate are fixed inside the cylinder body. The first baffle plate is fixed in the middle part of the cylinder body. There are two upper and lower flow-through channels between the first baffle plate and the cylinder body. The second baffle plate is fixed at the upper part of the cylinder body. There is only one lower flow-through channel between the baffle plate and the cylinder body.

[0010] Furthermore, at least one spare port is provided at the upper part of the cylinder body.

[0011] Furthermore, a maintenance port is provided on the second head, and a cover is detachably fixed on the maintenance port.

[0012] Furthermore, a first fixed ring plate is fixed on the inner wall of the cylinder body, and the first baffle plate is fixed together with the first fixed ring plate through connecting bolts.

[0013] Furthermore, a second fixed ring plate is fixed on the inner wall of the cylinder body, and the second baffle plate is fixed together with the second fixed ring plate through connecting bolts.

[0014] Advantages: In the present invention, the adsorbent in the saturated activated carbon adsorber is regenerated by low-pressure steam. The regenerated gas phase is cooled by a first cooler and a second cooler, and after two-stage condensation, it is collected in the gas-liquid separator. It enters the cylinder body through the air inlet of the gas-liquid separator, and passes through the first baffle plate and the second baffle plate of the cylinder body to achieve gas-liquid separation. The liquid flows downward along the inner wall of the cylinder body and is discharged from the liquid outlet pipe. The gas passes through the flow-through channels above the first baffle plate and below the second baffle plate, and finally is discharged from the gas outlet. The condensate is discharged to the storage tank for recycling, and the desorbed non-condensable gas returns to the previous stage for continuous adsorption, and the solvent recovery without shutdown is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the overall schematic diagram of the present invention;

[0016] Figure 2 is the structural schematic diagram of the gas-liquid separator in the present invention;

[0017] Figure 3 is the present invention Figure 2 the A-A cross-sectional view in;

[0018] Figure 4 is the present invention Figure 2 the B-B cross-sectional view in;

[0019] Figure 5 This is a schematic diagram of the connection of the controller in the present invention.

[0020] In the figure: 1 alkali spray tower, 2 first circulation pump, 3 water spray tower, 4 second circulation pump, 5 filter, 6 first activated carbon adsorber, 7 second activated carbon adsorber, 8 first cooler, 9 second cooler, 10 gas-liquid separator, 11 first switching valve, 12 second switching valve, 13 third switching valve, 14 fourth switching valve, 15 fifth switching valve, 16 sixth switching valve, 17 seventh switching valve, 18 eighth switching valve, 19 first connecting pipe, 20 second connecting pipe, 21 third connecting pipe, 22 fourth connecting pipe, 23 fifth connecting pipe, 24 sixth connecting pipe, 25 seventh connecting pipe, 26 eighth connecting pipe, 27 first communicating pipe, 28 second communicating pipe, 29 ninth connecting pipe, 30 tenth connecting pipe;

[0021] 701 first head, 702 cylinder body, 703 first baffle, 704 support, 705 second head, 706 second baffle, 707 first fixed ring plate, 708 connecting bolt, 709 second fixed ring plate, 710 spare port, 711 gas outlet, 712 liquid outlet, 713 gas inlet, 714 maintenance port, 715 cover. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0024] Refer to Figure 1As shown in Fig. –5, a steam adsorption and desorption condensation recovery system in the present invention includes an activated carbon adsorber I 6 and an activated carbon adsorber II 7. One end of the activated carbon adsorber I 6 is connected to an interface of a tee joint I. Another interface of the tee joint I is connected to a connecting pipe VII 25, and the last interface of the tee joint I is connected to a connecting pipe III 21. The other end of the activated carbon adsorber I 6 is connected to an interface of a tee joint II. Another interface of the tee joint II is connected to a connecting pipe I 19, and the last interface of the tee joint II is connected to a connecting pipe V 23. One end of the activated carbon adsorber II 7 is connected to an interface of a tee joint III. Another interface of the tee joint III is connected to a connecting pipe VIII 26, and the last interface of the tee joint III is connected to a connecting pipe IV 22. The other end of the activated carbon adsorber II 7 is connected to an interface of a tee joint IV. Another interface of the tee joint IV is connected to a connecting pipe II 20, and the last interface of the tee joint IV is connected to a connecting pipe VI 24. The connecting pipe III 21 and the connecting pipe IV 22 are connected to a cooling system, and the cooling system is connected to a gas-liquid separator 10. The ends of the connecting pipe VII 25 and the connecting pipe VIII 16 are both connected to the outlet end of a filter 5, and the inlet end of the filter 5 is connected to a pretreatment system. A switching valve I 11 is installed on the connecting pipe VII 25, a switching valve II 12 is installed on the connecting pipe VIII 26, a switching valve III 13 is installed on the connecting pipe V 23, a switching valve IV 14 is installed on the connecting pipe VI 24, a switching valve V 15 is installed on the connecting pipe I 19, a switching valve VII 17 is installed on the connecting pipe III 21, a switching valve VI 16 is installed on the connecting pipe II 20, a switching valve VIII 18 is installed on the connecting pipe IV 22, and the connecting pipe V 23 and the connecting pipe VI 24 are connected to an exhaust main pipe.

[0025] The cooling system includes a cooler I 8 and a cooler II 9. The connecting pipe III 21 and the connecting pipe IV 22 are connected to the gas-phase inlet end of the cooler I 8. The gas-phase outlet end of the cooler I 8 is connected to the gas-phase inlet end of the cooler II 9. The gas-phase outlet end of the cooler II 9 is connected to the gas-liquid separator 10. The liquid phases of the cooler I 8 and the cooler II 9 are both connected to a circulating water system. The connecting pipe VIII 26 is communicated with the connecting pipe VII 25, and the other end of the connecting pipe VII 25 is connected to the outlet end of the filter 5.

[0026] The pretreatment system includes an alkali spray tower 1 and a water spray tower 3. The air inlet end of the filter 5 is connected to one end of the connecting pipe ten 30, and the other end of the connecting pipe ten 30 is connected to the air outlet end at the upper part of the water spray tower 3. The air inlet end of the water spray tower 3 is connected to one end of the connecting pipe one 27, and the other end of the connecting pipe one 27 is connected to the air outlet end at the upper part of the alkali spray tower 1. The air inlet 713 of the alkali spray tower 1 is connected to the waste gas end. The bottom of the alkali spray tower 1 is connected to the inlet of the first circulation pump 2, and the outlet of the first circulation pump 2 is adjacent to the first spray system at the upper part of the alkali spray tower 1. The bottom of the water spray tower 3 is connected to the inlet of the second circulation pump 4, and the outlet of the second circulation pump 4 is connected to the second spray system at the upper part of the water spray tower 3. The bottoms of both the alkali spray tower 1 and the water spray tower 3 are connected to the sewage system. A second connecting pipe 28 is also provided between the alkali spray tower 1 and the water spray tower 3.

[0027] The present invention provides an embodiment. Referring to Figures 2 - 4 , the gas-liquid separator 10 includes a cylinder body 702. One end of the cylinder body 702 is fixedly connected to the first head 701, and the other end of the cylinder body 702 is fixedly connected to the second head 705. An air inlet 713 is provided on the first head 701. A support 704 is fixed at the bottom of the cylinder body 702. The included angle between the cylinder body 702 and the horizontal plane through the support 704 is 2-10°. A liquid outlet 712 is provided at the lower part of the cylinder body 702, and an air outlet 711 is provided at the upper part of the cylinder body 702. A first baffle 703 and a second baffle 706 are fixed inside the cylinder body 702. The first baffle 703 is fixed at the middle part of the cylinder body 702, and there are two upper and lower flow channels between the first baffle 703 and the cylinder body 702. The second baffle 706 is fixed at the upper part of the cylinder body 702, and there is only one lower flow channel between the baffle and the cylinder body 702. The air outlet 711 is connected to one end of the connecting pipe nine 29, and the other end of the connecting pipe nine 29 is connected to the connecting pipe ten 30. At least one spare port 710 is provided at the upper part of the cylinder body 702. A maintenance port 714 is provided on the second head 705, and a cover 715 is detachably fixed on the maintenance port 714. A first fixed ring plate 707 is fixed on the inner wall of the cylinder body 702, and the first baffle 703 is fixed to the first fixed ring plate 707 through a connecting bolt 708. A second fixed ring plate 709 is fixed on the inner wall of the cylinder body 702, and the second baffle 706 is fixed to the second fixed ring plate 709 through a connecting bolt 708.

[0028] After the waste gas is pretreated by the alkali spray tower 1 and the water spray tower 3 to remove substances that are easily soluble in water / acids / alkalis, it then enters the first activated carbon adsorber 6 after demisting by the filter 5 for adsorption treatment, and is then discharged through the exhaust main pipe.

[0029] The adsorbent in the saturated activated carbon adsorber is regenerated with low-pressure steam. The regenerated gas phase is cooled by cooler I 8 and cooler II 9 to obtain two-stage condensation and then collected in the gas-liquid separator 10. It enters the cylinder body 702 through the air inlet 713 of the gas-liquid separator 10 and passes through the first baffle 703 and the second baffle 706 of the cylinder body 702 to achieve gas-liquid separation. The liquid flows downward along the inner wall of the cylinder body 702 and is discharged from the liquid outlet pipe. The gas passes through the flow-through channels above the first baffle 703 and below the second baffle 706 and finally is discharged from the air outlet 711. The condensate is discharged to the storage tank for recycling, and the desorbed uncondensed gas returns to the previous stage for continued adsorption.

[0030] After the steam regeneration is completed, the inside of the activated carbon adsorber is purged by a fan and enters the drying process, which has the functions of both cooling and drying. The residual steam containing a high concentration of VOCs in the adsorber and the carbon bed is carried out, cooled and condensed by the cooler, and the organic matter in the residual steam is further recovered.

[0031] This application provides an embodiment. Referring to Figure 5 , the first switching valve 11, the third switching valve 13, the fifth switching valve 15, and the seventh switching valve 17 are the first group, and the second switching valve 12, the fourth switching valve 14, the sixth switching valve 16, and the eighth switching valve 18 are the second group. And both groups of switching valves are connected to the controller. An air velocity monitor I is provided on the connecting pipe seven 25 between the first switching valve 11 and the first activated carbon adsorber 6, and an air velocity monitor II is provided on the connecting pipe eight 26 between the second switching valve 12 and the second activated carbon adsorber 7. Both the air velocity monitor I and the air velocity monitor II are connected to the controller. Each of the first activated carbon adsorber 6 and the second activated carbon adsorber 7 is equipped with a time accumulation module, and the time accumulation module includes a timing module and a clearing module. Both the timing module and the clearing module are connected to the controller.

[0032] Referring to Figure 1 and Figure 5, a steam adsorption-desorption condensation recovery method. The activated carbon adsorber 1 (6) and the activated carbon adsorber 2 (7) are each equipped with a time accumulation module. At this time, the system compares the values of the timing modules of the time accumulation modules of the activated carbon adsorber 1 (6) and the activated carbon adsorber 2 (7). When the values of the timing modules of the activated carbon adsorber 1 (6) and the activated carbon adsorber 2 (7) are both less than the recovery threshold, and the values of the timing modules of the activated carbon adsorber 1 (6) and the activated carbon adsorber 2 (7) are both less than 50% of the recovery threshold, the system uses the activated carbon adsorber 1 (6) and the activated carbon adsorber 2 (7) for adsorption recovery. The switching valve 1 (11) and the switching valve 3 (13) of the activated carbon adsorber 1 (6) are opened, and the switching valve 5 (15) and the switching valve 7 (17) are closed. The switching valve 2 (12) and the switching valve 4 (14) of the activated carbon adsorber 2 (7) are opened, and the switching valve 6 (16) and the switching valve 8 (18) are closed. When there is a value on the anemometer 1 on the connecting pipe 7 (25), the anemometer 1 transmits a signal to the controller, and the controller controls the timing module of the time accumulation module of the activated carbon adsorber 1 (6) to start. When there is a value on the anemometer 2 on the connecting pipe 8 (26), the anemometer 2 transmits a signal to the controller, and the controller controls the timing module of the time accumulation module of the activated carbon adsorber 2 (7) to start. The waste gas is purified by the activated carbon in the activated carbon adsorber 1 (6) and the activated carbon adsorber 2 (7); when the cumulative usage time of either the activated carbon adsorber 1 (6) or the activated carbon adsorber 2 (7) ≥ 90% of the recovery threshold, for example, the cumulative usage time of the activated carbon adsorber 2 (7) ≥ 90% of the recovery threshold, the system recovers the activated carbon adsorber 2 (7). The switching valve 2 (12) and the switching valve 4 (14) of the activated carbon adsorber 2 (7) are closed, and the switching valve 6 (16) and the switching valve 8 (18) are opened. When there is no value on the anemometer 2 on the connecting pipe 8 (26), the anemometer 2 transmits a signal to the controller, and the controller controls the timing module of the time accumulation module of the activated carbon adsorber 2 (7) to close. The solvent in the activated carbon adsorber 2 (7) is recovered by water vapor. The recovered gas enters the cooler 1 (8) and the cooler 2 (9) for condensation, and then enters the gas-liquid separator 10. After the recovery of the activated carbon adsorber 2 (7) is completed, the zero-clearing module in the time accumulation module of the activated carbon adsorber 2 (7) clears the timing module;

[0033] When the cumulative usage times of both the activated carbon adsorber 1-6 and the activated carbon adsorber 2-7 are greater than 50% of the recovery threshold, the system selects the activated carbon adsorber with the smaller value in the usage time accumulation module. For example, if the cumulative usage time of the activated carbon adsorber 1-6 is less than that of the activated carbon adsorber 2-7, the switching valve 1-11 and the switching valve 1-13 of the activated carbon adsorber 1-6 are opened, and the switching valve 1-15 and the switching valve 1-17 of the activated carbon adsorber 1-6 are closed. When there is a value on the anemometer 1 on the connecting pipe 7-25, the anemometer 1 transmits a signal to the controller, and the controller controls the timing module of the time accumulation module of the activated carbon adsorber 1-6 to start. In this state, the system recovers the activated carbon adsorber 2-7. The switching valve 2-12 and the switching valve 2-14 of the activated carbon adsorber 2-7 are closed, and the switching valve 2-16 and the switching valve 2-18 are opened. When there is no value on the anemometer 2 on the connecting pipe 8-26, the anemometer 2 transmits a signal to the controller, and the controller controls the timing module of the time accumulation module of the activated carbon adsorber 2-7 to close. The solvent in the activated carbon adsorber is recovered by water vapor. The recovered gas enters the cooler 1-8 and the cooler 2-9 for condensation, and then enters the gas-liquid separator 10. After the recovery of the activated carbon adsorber 2-7 is completed, the clearing module in the time accumulation module of the activated carbon adsorber 2-7 clears the timing module. Then the system uses the activated carbon adsorber 2-7 for adsorption. The switching valve 2-12 and the switching valve 2-14 of the activated carbon adsorber 2-7 are opened, and the switching valve 2-16 and the switching valve 2-18 are closed. Then the activated carbon adsorber 1-6 is recovered. The switching valve 1-11 and the switching valve 1-13 of the activated carbon adsorber 1-6 are closed, and the switching valve 1-14 and the switching valve of the adsorber 1 are opened. The solvent in the activated carbon adsorber 1-6 is recovered by water vapor. The recovered gas enters the cooler 1-8 and the cooler 2-9 for condensation, and then enters the gas-liquid separator 10. After the recovery of the activated carbon adsorber 1-6 is completed, the clearing module in the time accumulation module of the activated carbon adsorber 1-6 clears the timing module.

[0034] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A steam adsorption and desorption condensation recovery method, characterized in that: The following condensation recovery system is adopted. The condensation recovery system includes activated carbon adsorber 1 and activated carbon adsorber 2. One end of activated carbon adsorber 1 is connected to an interface of three-way connector 1. Another interface of three-way connector 1 is connected to connecting pipe 7. The last interface of three-way connector 1 is connected to connecting pipe 3. The other end of activated carbon adsorber 1 is connected to an interface of three-way connector 2. Another interface of three-way connector 2 is connected to connecting pipe 1. The last interface of three-way connector 2 is connected to connecting pipe 5. One end of activated carbon adsorber 2 is connected to an interface of three-way connector 3. Another interface of three-way connector 3 is connected to connecting pipe 8. The last interface of three-way connector 3 is connected to connecting pipe 4. The other end of activated carbon adsorber 2 is connected to an interface of three-way connector 4. Another interface of three-way connector 4 is connected to connecting pipe 2. The last interface of three-way connector 4 is connected to connecting pipe 6. Connecting pipe 3 and connecting pipe 4 are connected to a cooling system. The cooling system is connected to a gas-liquid separator. Connecting pipe 8 is communicated with connecting pipe 7. The other end of connecting pipe 7 is connected to the outlet end of a filter. The inlet end of the filter is connected to a pretreatment system. A switching valve 1 is installed on connecting pipe 7. A switching valve 2 is installed on connecting pipe 8. A switching valve 3 is installed on connecting pipe 5. A switching valve 4 is installed on connecting pipe 6. A switching valve 5 is installed on connecting pipe 1. A switching valve 7 is installed on connecting pipe 3. A switching valve 6 is installed on connecting pipe 2. A switching valve 8 is installed on connecting pipe 4. Activated carbon adsorber 1 and activated carbon adsorber 2 are each equipped with a time accumulation module. At this time, the system compares the values of the timing modules of the time accumulation modules of activated carbon adsorber 1 and activated carbon adsorber 2. When the values of the timing modules of activated carbon adsorber 1 and activated carbon adsorber 2 are both less than the recovery threshold, and the values of the timing modules of activated carbon adsorber 1 and activated carbon adsorber 2 are both less than 50% of the recovery threshold, the system uses activated carbon adsorber 1 and activated carbon adsorber 2 for adsorption recovery. The switching valve 1 and switching valve 3 of activated carbon adsorber 1 are opened, and the switching valve 5 and switching valve 7 are closed. The switching valve 2 and switching valve 4 of activated carbon adsorber 2 are opened, and the switching valve 6 and switching valve 8 are closed. When there is a value on the wind speed monitor 1 on connecting pipe 7, the wind speed monitor 1 transmits a signal to the controller, and the controller controls the timing module of the time accumulation module of activated carbon adsorber 1 to start. When there is a value on the wind speed monitor 2 on connecting pipe 8, the wind speed monitor 2 transmits a signal to the controller, and the controller controls the timing module of the time accumulation module of activated carbon adsorber 2 to start. The waste gas is purified by the activated carbon in activated carbon adsorber 1 and activated carbon adsorber 2;When the cumulative usage time of Activated Carbon Adsorber 1 or Activated Carbon Adsorber 2 ≥ 90% of the recovery threshold, when there is no value from Anemometer 2 on Connecting Pipe 8, Anemometer 2 transmits a signal to the controller. The controller controls the timing module of the time accumulation module of Activated Carbon Adsorber 2 to turn off. The solvent in Activated Carbon Adsorber 2 is recovered by steam. The recovered gas enters Cooler 1 and Cooler 2 for condensation, and then enters the Gas-Liquid Separator. After the recovery of Activated Carbon Adsorber 2 is completed, the clearing module in the time accumulation module of Activated Carbon Adsorber 2 clears the timing module; When the cumulative usage times of Activated Carbon Adsorber 1 and Activated Carbon Adsorber 2 are both greater than 50% of the recovery threshold, the system selects the activated carbon adsorber with the smaller value in the usage time accumulation module. When the Anemometer 1 on the Connecting Pipe 7 has a value, Anemometer 1 transmits the signal to the controller, and the controller controls the timing module of the time accumulation module of Activated Carbon Adsorber 1 to start. In this state, the system recovers Activated Carbon Adsorber 2, closes the Switching Valve 2 and Switching Valve 4 of Activated Carbon Adsorber 2, and opens the Switching Valve 6 and Switching Valve 8. When the Anemometer 2 on the Connecting Pipe 8 has no value, Anemometer 2 transmits the signal to the controller, and the controller controls the timing module of the time accumulation module of Activated Carbon Adsorber 2 to close. The solvent in the activated carbon adsorber is recovered by water vapor, and the recovered gas enters the Cooler 1 and Cooler 2 for condensation, and then enters the Gas-Liquid Separator. After the recovery of Activated Carbon Adsorber 2 is completed, the zero-clearing module in the time accumulation module of Activated Carbon Adsorber 2 clears the timing module. Then the system uses Activated Carbon Adsorber 2 for adsorption, opens the Switching Valve 2 and Switching Valve 4 of Activated Carbon Adsorber 2, and closes the Switching Valve 6 and Switching Valve 8. Then it recovers Activated Carbon Adsorber 1, closes the Switching Valve 1 and Switching Valve 3 of Adsorber 1, and opens the Switching Valve 4 and Switching Valve of Adsorber 1. The solvent in Activated Carbon Adsorber 1 is recovered by water vapor, and the recovered gas enters the Cooler 1 and Cooler 2 for condensation, and then enters the Gas-Liquid Separator. After the recovery of Activated Carbon Adsorber 1 is completed, the zero-clearing module in the time accumulation module of Activated Carbon Adsorber 1 clears the timing module.

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