Steam adsorption and desorption condensation recovery system and method

Abstract

The invention relates to the technical field of flue gas recovery, in particular to a steam adsorption and desorption condensation recovery system and method.One end of a first activated carbon adsorber is connected with one connector of a first three-way connecting piece, the other connector of the first three-way connecting piece is connected with a seventh connecting pipe, and the last connector of the first three-way connecting piece is connected with a third connecting pipe; the other end of the first activated carbon adsorber is connected with one connector of a second three-way connecting piece, the other connector of the second three-way connecting piece is connected with a first connecting pipe, the last connector of the second three-way connecting piece is connected with a fifth connecting pipe, a third connecting pipe is connected with a cooling system, and the cooling system is connected with a gas-liquid separator. An adsorbent in a saturated activated carbon adsorber is regenerated by adopting low-pressure steam, a regenerated gas phase is collected into a gas-liquid separator after being subjected to two-stage condensation by a cooling system, condensate is discharged into a storage tank to be recycled, desorbed uncondensed gas is returned to the front section to be continuously adsorbed, and non-stop solvent recovery is realized.

Description

Technical Field

[0001] The patent of this invention relates to the field of flue gas recovery technology, and specifically to a steam adsorption, desorption, condensation and recovery system and method. Background Art

[0002] In the process of industrial production, especially in the fields of chemical industry, coating, printing, solvent recovery, etc., the waste gas often contains a large amount of organic solvent components. These organic solvents not only cause serious pollution to the environment, but may also pose a threat to human health. Therefore, how to effectively recover and treat organic solvents in waste gas has become an important issue in environmental protection and resource recycling. Traditional waste gas solvent recovery methods mainly include adsorption method, condensation method, washing method, etc. The adsorption method usually uses adsorption materials such as activated carbon and molecular sieves to remove solvent components in the waste gas through physical adsorption, but because the solvent recovery efficiency is low and it is easy to cause the adsorbent to be saturated, it needs to be replaced or regenerated regularly. The condensation method condenses the solvent vapor into a liquid by lowering the temperature and separates the solvent from the gas phase. It is suitable for situations where the solvent is highly volatile, but in the prior art, the adsorber needs to be shut down during solvent recovery, resulting in reduced adsorption efficiency. Summary of the invention

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

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A steam adsorption, desorption, condensation and recovery system, comprising an activated carbon adsorber 1 and an activated carbon adsorber 2, wherein one end of the activated carbon adsorber 1 is connected to an interface of a three-way connector 1, another interface of the three-way connector 1 is connected to a connecting pipe 7, the last interface of the three-way connector 1 is connected to a connecting pipe 3, the other end of the activated carbon adsorber 1 is connected to an interface of a three-way connector 2, another interface of the three-way connector 2 is connected to a connecting pipe 1, the last interface of the three-way connector 2 is connected to a connecting pipe 5, one end of the activated carbon adsorber 2 is connected to an interface of a three-way connector 3, another interface of the three-way connector 3 is connected to a connecting pipe 8, the last interface of the three-way connector 3 is connected to a connecting pipe 4, and the other interface of the activated carbon adsorber 2 One end is connected to an interface of three-way connector four, the other interface of three-way connector four is connected to connecting pipe two, the last interface of three-way connector four is connected to connecting pipe six, connecting pipe three and connecting pipe four are connected to the cooling system, the cooling system is connected to the gas-liquid separator, connecting pipe eight is connected to connecting pipe seven, the other end of connecting pipe seven is connected to the outlet end of the filter, the air inlet end of the filter is connected to the pretreatment system, connecting pipe seven is equipped with switching valve one, connecting pipe eight is equipped with switching valve two, connecting pipe five is equipped with switching valve three, connecting pipe six is ​​equipped with switching valve four, connecting pipe one is equipped with switching valve five, connecting pipe three is equipped with switching valve seven, connecting pipe two is equipped with switching valve six, and connecting pipe four is equipped with switching valve eight.

[0005] Furthermore, the cooling system includes cooler one and cooler two, the connecting pipe three and the connecting pipe four are connected to the gas phase inlet end of cooler one, the gas phase outlet end of cooler one is connected to the gas phase inlet end of cooler two, the gas phase outlet end of cooler two is connected to a gas-liquid separator, and the liquid phases of cooler one and cooler two are both connected to a circulating water system.

[0006] Furthermore, the pretreatment system includes an alkali spray tower and a water spray tower, the air inlet end of the filter is connected to one end of a connecting pipe ten, the other end of the connecting pipe ten is connected to the air outlet end of the upper end of the water spray tower, the air inlet end of the water spray tower is connected to one end of a connecting pipe one, the other end of the connecting pipe one is connected to the air outlet end of the upper end of the alkali spray tower, the air inlet of the alkali spray tower is connected to the exhaust gas end, the bottom of the alkali spray tower is connected to the inlet of a circulating pump one, the outlet of the circulating pump one is adjacent to the spray system one on the top of the alkali spray tower, the bottom of the water spray tower is connected to the inlet of a circulating pump two, the outlet of the circulating pump two is connected to the spray system two on the top of the water spray tower, and the bottoms of the alkali spray tower and the water spray tower are both connected to the sewage system.

[0007] Furthermore, a second connecting pipe is provided between the alkali spray tower and the water spray tower.

[0008] Furthermore, the gas-liquid separator includes a cylinder, one end of which is fixedly connected to a first end cap, and the other end of which is fixedly connected to a second end cap. An air inlet is arranged on the first end cap, a support is fixedly arranged at the bottom of the cylinder, and the angle between the cylinder and the horizontal plane through the support is 2-10°. A liquid outlet is arranged at the lower part of the cylinder, and an air outlet is arranged at the upper part of the cylinder. A baffle plate 1 and a baffle plate 2 are fixed in the cylinder, the baffle plate 1 is fixed at the middle part of the cylinder, and there are two upper and lower flow channels between the baffle plate 1 and the cylinder, and the baffle plate 2 is fixed at the upper part of the cylinder, and there is only one lower flow channel between the baffle plate and the cylinder.

[0009] Furthermore, at least one spare port is provided on the upper portion of the cylinder.

[0010] Furthermore, a maintenance port is provided on the second sealing head, and a sealing cover is detachably fixed on the maintenance port.

[0011] Furthermore, a fixed ring plate 1 is fixed to the inner wall of the cylinder, and the baffle plate 1 is fixed to the fixed ring plate 1 by connecting bolts.

[0012] Furthermore, a second fixing ring plate is fixed to the inner wall of the cylinder, and the second baffle plate is fixed to the second fixing ring plate by connecting bolts.

[0013] Advantages: The present invention regenerates the adsorbent in the saturated activated carbon adsorber with low-pressure steam, and the regenerated gas phase is condensed in two stages by cooler one and cooler two, and then collected in a gas-liquid separator, enters the cylinder through the air inlet of the gas-liquid separator, and passes through baffle one and baffle two of the cylinder to achieve gas-liquid separation. The liquid flows downward along the inner wall of the cylinder and is discharged from the liquid outlet pipe. The gas passes through the flow channel at the top of baffle one and the flow channel at the bottom of baffle two, and is finally discharged from the air outlet. The condensate is discharged to a storage tank for recycling and reuse, and the desorbed uncondensed gas returns to the front stage for continued adsorption, and the solvent is recovered without stopping the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an overall schematic diagram of the present invention; Figure 2 It is a schematic diagram of the structure of the gas-liquid separator in the present invention; Figure 3 For the present invention Figure 2 Sectional view of AA in the middle; Figure 4 For the present invention Figure 2 Cross-sectional view of the middle BB; Figure 5 It is a connection diagram of the controller in the present invention.

[0015] In the figure: 1 alkali spray tower, 2 circulating pump 1, 3 water spray tower, 4 circulating pump 2, 5 filter, 6 activated carbon adsorber 1, 7 activated carbon adsorber 2, 8 cooler 1, 9 cooler 2, 10 gas-liquid separator, 11 switching valve 1, 12 switching valve 2, 13 switching valve 3, 14 switching valve 4, 15 switching valve 5, 16 switching valve 6, 17 switching valve 7, 18 switching valve 8, 19 connecting pipe 1, 20 connecting pipe 2, 21 connecting pipe 3, 22 connecting pipe 4, 23 connecting pipe 5, 24 connecting pipe 6, 25 connecting pipe 7, 26 connecting pipe 8, 27 connecting pipe 1, 28 connecting pipe 2, 29 connecting pipe 9, 30 connecting pipe 10; 701 Head 1, 702 Cylinder, 703 Baffle 1, 704 Support, 705 Head 2, 706 Baffle 2, 707 Fixed Ring Plate 1, 708 Connecting Bolt, 709 Fixed Ring Plate 2, 710 Spare Port, 711 Air Outlet, 712 Liquid Outlet, 713 Air Inlet, 714 Maintenance Port, 715 Cover. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0017] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 cannot be understood as a limitation on the present invention.

[0018] Reference Figure 1–5 shows a steam adsorption, desorption, condensation and recovery system in the present invention, including an activated carbon adsorber 1 6 and an activated carbon adsorber 2 7, one end of the activated carbon adsorber 1 6 is connected to an interface of the three-way connector 1, the other interface of the three-way connector 1 is connected to the connecting pipe 7 25, the last interface of the three-way connector 1 is connected to the connecting pipe 3 21, the other end of the activated carbon adsorber 1 6 is connected to an interface of the three-way connector 2, the other interface of the three-way connector 2 is connected to the connecting pipe 1 19, the last interface of the three-way connector 2 is connected to the connecting pipe 5 23, one end of the activated carbon adsorber 2 7 is connected to an interface of the three-way connector 3, the other interface of the three-way connector 3 is connected to the connecting pipe 8 26, the last interface of the three-way connector 3 is connected to the connecting pipe 4 22, and the other end of the activated carbon adsorber 2 7 is connected to an interface of the three-way connector 4 , another interface of the three-way connector four is connected to the connecting pipe two 20, the last interface of the three-way connector four is connected to the connecting pipe six 24, the connecting pipe three 21 and the connecting pipe four 22 are connected to the cooling system, the cooling system is connected to the gas-liquid separator 10, the ends of the connecting pipe seven 25 and the connecting pipe eight 16 are connected to the gas outlet end of the filter 5, the gas inlet end of the filter 5 is connected to the pretreatment system, the connecting pipe seven 25 is equipped with a switching valve one 11, the connecting pipe eight 26 is equipped with a switching valve two 12, the connecting pipe five 23 is equipped with a switching valve three 13, the connecting pipe six 24 is equipped with a switching valve four 14, the connecting pipe one 19 is equipped with a switching valve five 15, the connecting pipe three 21 is equipped with a switching valve seven 17, the connecting pipe two 20 is equipped with a switching valve six 16, the connecting pipe four 22 is equipped with a switching valve eight 18, the connecting pipe five 23 and the connecting pipe six 24 are connected to the exhaust main pipe.

[0019] The cooling system includes cooler 1 8 and cooler 2 9. The connecting pipe 3 21 and the connecting pipe 4 22 are connected to the gas phase inlet end of cooler 1 8. The gas phase outlet end of cooler 1 8 is connected to the gas phase inlet end of cooler 2 9. The gas phase outlet end of cooler 2 9 is connected to the gas-liquid separator 10. The liquid phases of cooler 1 8 and cooler 2 9 are both connected to the circulating water system. The connecting pipe 8 26 is connected to the connecting pipe 7 25. The other end of the connecting pipe 7 25 is connected to the outlet end of the filter 5.

[0020] 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 a connecting pipe 10 30, the other end of the connecting pipe 10 30 is connected to the air outlet end of the upper end of the water spray tower 3, the air inlet end of the water spray tower 3 is connected to one end of a connecting pipe 1 27, the other end of the connecting pipe 1 27 is connected to the air outlet end of the upper end of the alkali spray tower 1, the air inlet 713 of the alkali spray tower 1 is connected to the exhaust gas end, the bottom of the alkali spray tower 1 is connected to the inlet of a circulating pump 1 2, the outlet of the circulating pump 1 2 is adjacent to the spray system 1 at the top of the alkali spray tower 1, the bottom of the water spray tower 3 is connected to the inlet of a circulating pump 2 4, the outlet of the circulating pump 2 4 is connected to the spray system 2 at the top of the water spray tower 3, and the bottoms of the alkali spray tower 1 and the water spray tower 3 are both connected to the sewage system. A connecting pipe 2 28 is also provided between the alkali spray tower 1 and the water spray tower 3.

[0021] This invention provides an embodiment with reference to Figure 2-4 The gas-liquid separator 10 includes a cylinder 702, one end of which is fixedly connected to a head 701, and the other end of the cylinder 702 is fixedly connected to a head 705. An air inlet 713 is arranged on the head 701, a support 704 is fixedly arranged at the bottom of the cylinder 702, and the angle between the cylinder 702 and the horizontal plane through the support 704 is 2-10°, a liquid outlet 712 is arranged at the lower part of the cylinder 702, and an air outlet 711 is arranged at the upper part of the cylinder 702. A baffle 1 703 and a baffle 2 706 are fixed in the cylinder 702, the baffle 1 703 is fixed at the middle part of the cylinder 702, and there are two upper and lower flow channels between the baffle 1 703 and the cylinder 702, the baffle 2 706 is fixed at the upper part of the cylinder 702, and there is only one lower flow channel between the baffle and the cylinder 702. The gas outlet 711 is connected to one end of the connecting pipe 929, and the other end of the connecting pipe 929 is connected to the connecting pipe 1030. At least one spare port 710 is provided on the upper part of the cylinder 702. A maintenance port 714 is provided on the second end cap 705, and a cover 715 is detachably fixed on the maintenance port 714. A fixed ring plate 1 707 is fixed to the inner wall of the cylinder 702, and the baffle 1 703 is fixed to the fixed ring plate 1 707 by connecting bolts 708. A fixed ring plate 2 709 is fixed to the inner wall of the cylinder 702, and the baffle 2 706 is fixed to the fixed ring plate 2 709 by connecting bolts 708.

[0022] After the waste gas is pre-treated by the alkali spray tower 1 and the water spray tower 3, the water-soluble / acidic / alkaline substances are removed, and then the waste gas enters the activated carbon adsorber 6 after demisting by the filter 5 for adsorption treatment, and is discharged from the exhaust main pipe after treatment.

[0023] The adsorbent in the saturated activated carbon adsorber is regenerated by low-pressure steam, and the regenerated gas phase is condensed in two stages by cooler 1 8 and cooler 2 9 and then collected in the gas-liquid separator 10, entering the cylinder 702 through the air inlet 713 of the gas-liquid separator 10, and passing through the baffle 1 703 and the baffle 2 706 of the cylinder 702, thereby achieving gas-liquid separation. The liquid flows downward along the inner wall of the cylinder 702 and is discharged from the liquid outlet pipe. The gas passes through the flow channel at the top of the baffle 1 703 and the flow channel at the bottom of the baffle 2 706, and is finally discharged from the gas outlet 711. The condensate is discharged to the storage tank for recycling and reuse, and the desorbed uncondensed gas returns to the front stage for continued adsorption.

[0024] After 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 cooling and drying. The residual steam containing high concentrations of VOCs in the adsorber and carbon bed is taken out, condensed and cooled by a cooler, and the organic matter in the residual steam is further recovered.

[0025] This invention provides an embodiment with reference to Figure 5 The switching valve 11, the switching valve 3 13, the switching valve 5 15, and the switching valve 7 17 are the first group, and the switching valve 2 12, the switching valve 4 14, the switching valve 6 16, and the switching valve 8 18 are the second group, and both groups of switching valves are connected to the controller, and a wind speed monitor 1 is arranged on the connecting pipe 7 25 between the switching valve 1 11 and the activated carbon adsorber 1 6, and a wind speed monitor 2 is arranged on the connecting pipe 8 26 between the switching valve 2 12 and the activated carbon adsorber 2 7, and the wind speed monitor 1 and the wind speed monitor 2 are both connected to the controller, and the activated carbon adsorber 1 6 and the activated carbon adsorber 2 7 are both equipped with a time accumulation module, and the time accumulation module includes a timing module and a zeroing module, and the timing module and the zeroing module are both connected to the controller.

[0026] Reference Figure 1 and Figure 5A steam adsorption, desorption, condensation and recovery method, wherein the activated carbon adsorber 1-6 and the activated carbon adsorber 2-7 are each equipped with a time accumulation module, and the system at this time 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, and 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. The activated carbon adsorber 1 is adsorbed and recovered at 27, the switching valve 11 and the switching valve 3 13 of the activated carbon adsorber 1 6 are opened, 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, the switching valve 6 16 and the switching valve 8 18 are closed, when the wind speed monitor 1 on the connecting pipe 7 25 has a value, the wind speed monitor 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 be turned on, and when the wind speed monitor 2 on the connecting pipe 8 26 has a value, the wind speed monitor 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 be turned on. The instrument 2 transmits the signal to the controller, and the controller controls the timing module of the time accumulation module of the activated carbon adsorber 27 to start, and the activated carbon of the activated carbon adsorber 16 and the activated carbon adsorber 27 is used to purify the exhaust gas; when the accumulated use time of the activated carbon adsorber 16 or the activated carbon adsorber 27 is ≥ 90% of the recovery threshold, for example, the accumulated use time of the activated carbon adsorber 27 is ≥ 90% of the recovery threshold, the system recovers the activated carbon adsorber 27, and the switching valve 212 and the switching valve 414 of the activated carbon adsorber 27 are closed, and the switching valve 12 and the switching valve 414 of the activated carbon adsorber 27 are closed. The valve six 16 and the switching valve eight 18 are opened. When the wind speed monitor two on the connecting pipe eight 26 has no value, the wind speed monitor two transmits a signal to the controller. The controller controls the timing module of the time accumulation module of the activated carbon adsorber two 7 to be closed, and the solvent in the activated carbon adsorber two 7 is recovered by water vapor. The recovered gas enters the cooler one 8 and the cooler two 9 for condensation, and then enters the gas-liquid separator 10. After the activated carbon adsorber two 7 is recovered, the reset module in the time accumulation module of the activated carbon adsorber two 7 resets the timing module; When the accumulated usage time of activated carbon adsorber 1 6 and activated carbon adsorber 2 7 are both greater than 50% of the recycling threshold, the system selects the activated carbon adsorber with a smaller value in the usage time accumulation module. For example, if the accumulated usage time of activated carbon adsorber 1 6 is less than the accumulated usage time of activated carbon adsorber 2 7, the switching valve 1 11 and switching valve 3 13 of activated carbon adsorber 1 6 are opened, and the switching valve 5 15 and switching valve 7 17 of activated carbon adsorber 1 6 are closed. When the wind speed monitor 1 on connecting pipe 7 25 has a value, 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 6 to be turned on. In this state, the system recycles activated carbon adsorber 2 7, the switching valve 2 12 and switching valve 4 14 of activated carbon adsorber 2 7 are closed, and the switching valve 6 16 and switching valve 8 18 are opened. When the wind speed monitor 2 on connecting pipe 8 26 has no value, 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 7 to be turned on. The timing module is closed, and the solvent in the activated carbon adsorber is recovered by water vapor. The recovered gas enters cooler 1 8 and cooler 2 9 for condensation, and then enters the gas-liquid separator 10. After the recovery of activated carbon adsorber 2 7 is completed, the reset module in the time accumulation module of activated carbon adsorber 2 7 resets the timing module, and then the system uses activated carbon adsorber 2 7 for adsorption, the switching valve 2 12 and switching valve 4 14 of activated carbon adsorber 2 7 are opened, the switching valve 6 16 and switching valve 8 18 are closed, and then the activated carbon adsorber 1 6 is recovered, the switching valve 1 11 and switching valve 3 13 of activated carbon adsorber 1 6 are closed, the switching valve 4 14 and switching valve 8 of adsorber 1 are opened, and the solvent in activated carbon adsorber 1 6 is recovered by water vapor. The recovered gas enters cooler 1 8 and cooler 2 9 for condensation, and then enters the gas-liquid separator 10. After the recovery of activated carbon adsorber 1 6 is completed, the reset module in the time accumulation module of activated carbon adsorber 1 6 resets the timing module.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A steam adsorption, desorption, condensation and recovery system, characterized in that: The invention comprises an activated carbon adsorber 1 and an activated carbon adsorber 2, wherein one end of the activated carbon adsorber 1 is connected to an interface of a three-way connector 1, another interface of the three-way connector 1 is connected to a connecting pipe 7, the last interface of the three-way connector 1 is connected to a connecting pipe 3, the other end of the activated carbon adsorber 1 is connected to an interface of a three-way connector 2, another interface of the three-way connector 2 is connected to a connecting pipe 1, the last interface of the three-way connector 2 is connected to a connecting pipe 5, one end of the activated carbon adsorber 2 is connected to an interface of a three-way connector 3, another interface of the three-way connector 3 is connected to a connecting pipe 8, the last interface of the three-way connector 3 is connected to a connecting pipe 4, the other end of the activated carbon adsorber 2 is connected to the three-way connector The three-way connector is connected to an interface of the three-way connector four, the other interface of the three-way connector four is connected to the connecting pipe two, the last interface of the three-way connector four is connected to the connecting pipe six, the connecting pipe three and the connecting pipe four are connected to the cooling system, the cooling system is connected to the gas-liquid separator, the connecting pipe eight is communicated with the connecting pipe seven, the other end of the connecting pipe seven is connected to the outlet end of the filter, the air inlet end of the filter is connected to the pretreatment system, the connecting pipe seven is equipped with a switching valve one, the connecting pipe eight is equipped with a switching valve two, the connecting pipe five is equipped with a switching valve three, the connecting pipe six is ​​equipped with a switching valve four, the connecting pipe one is equipped with a switching valve five, the connecting pipe three is equipped with a switching valve seven, the connecting pipe two is equipped with a switching valve six, and the connecting pipe four is equipped with a switching valve eight.

2. A steam adsorption-desorption-condensation recovery system according to claim 1, characterized in that: The cooling system includes cooler 1 and cooler 2, the connecting pipe 3 and the connecting pipe 4 are connected to the gas phase air inlet end of cooler 1, the gas phase air outlet end of cooler 1 is connected to the gas phase air inlet end of cooler 2, the gas phase air outlet end of cooler 2 is connected to a gas-liquid separator, and the liquid phases of cooler 1 and cooler 2 are both connected to a circulating water system.

3. A steam adsorption-desorption-condensation recovery system according to claim 1, characterized in that: The pretreatment system includes an alkali spray tower and a water spray tower, the air inlet end of the filter is connected to one end of a connecting pipe ten, the other end of the connecting pipe ten is connected to the air outlet end of the upper end of the water spray tower, the air inlet end of the water spray tower is connected to one end of a connecting pipe one, the other end of the connecting pipe one is connected to the air outlet end of the upper end of the alkali spray tower, the air inlet of the alkali spray tower is connected to the exhaust gas end, the bottom of the alkali spray tower is connected to the inlet of a circulating pump one, the outlet of the circulating pump one is adjacent to the spray system one on the upper part of the alkali spray tower, the bottom of the water spray tower is connected to the inlet of a circulating pump two, the outlet of the circulating pump two is connected to the spray system two on the upper part of the water spray tower, and the bottoms of the alkali spray tower and the water spray tower are both connected to the sewage system.

4. A steam adsorption-desorption-condensation recovery system according to claim 3, characterized in that: A second connecting pipe is also provided between the alkali spray tower and the water spray tower.

5. A steam adsorption-desorption-condensation recovery system according to claim 1, characterized in that: The gas-liquid separator includes a cylinder, one end of which is fixedly connected to a first end cap, and the other end of which is fixedly connected to a second end cap. An air inlet is arranged on the first end cap, a support is fixedly arranged at the bottom of the cylinder, and the angle between the cylinder and the horizontal plane through the support is 2-10°. A liquid outlet is arranged at the lower part of the cylinder, and an air outlet is arranged at the upper part of the cylinder. A baffle plate 1 and a baffle plate 2 are fixed in the cylinder, the baffle plate 1 is fixed at the middle part of the cylinder, and there are two upper and lower flow channels between the baffle plate 1 and the cylinder, the baffle plate 2 is fixed at the upper part of the cylinder, and there is only one lower flow channel between the baffle plate and the cylinder.

6. A steam adsorption-desorption-condensation recovery system according to claim 5, characterized in that: The second sealing head is provided with a maintenance port, and a sealing cover is detachably fixed on the maintenance port.

7. A steam adsorption-desorption-condensation recovery system according to claim 5, characterized in that: A fixed ring plate 1 is fixed to the inner wall of the cylinder, and the baffle plate 1 is fixed to the fixed ring plate 1 by connecting bolts.

8. A steam adsorption-desorption-condensation recovery system according to claim 5, characterized in that: A second fixing ring plate is fixed on the inner wall of the cylinder, and the second baffle plate is fixed to the second fixing ring plate by connecting bolts.

9. A steam adsorption-desorption-condensation recovery method, characterized in that: 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, 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, the switching valve 6 and switching valve 8 are closed, when the wind speed monitor 1 on the connecting pipe 7 has a value, 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 open, and when the wind speed monitor 2 on the connecting pipe 8 has a value, the wind speed monitor 2 transmits a signal to the controller. The controller controls the timing module of the time accumulation module of the activated carbon adsorber 2 to be turned on, and the waste gas is purified by the activated carbon of the activated carbon adsorber 1 and the activated carbon adsorber 2; when the cumulative use time of the activated carbon adsorber 1 or the activated carbon adsorber 2 is ≥ 90% of the recovery threshold, for example, the cumulative use time of the activated carbon adsorber 2 is ≥ 90% of the recovery threshold, the system recovers the activated carbon adsorber 2, the switching valve 2 and the switching valve 4 of the activated carbon adsorber 2 are closed, and the switching valve 6 and the switching valve 8 are opened. When the wind speed monitor 2 on the connecting pipe 8 has no value, the wind speed monitor 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 to be turned off, and the solvent in the activated carbon adsorber 2 is recovered by water vapor. The recovered gas enters the cooler 1 and the cooler 2 for condensation, and then enters the gas-liquid separator. After the recovery of the activated carbon adsorber 2 is completed, the zeroing module in the time accumulation module of the activated carbon adsorber 2 resets the timing module; When the accumulated usage time 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 a smaller value in the usage time accumulation module. For example, if the accumulated usage time of activated carbon adsorber 1 is less than the accumulated usage time of activated carbon adsorber 2, the switching valve 1 and switching valve 3 of activated carbon adsorber 1 are opened, and the switching valve 5 and switching valve 7 of activated carbon adsorber 1 are closed. When the wind speed monitor 1 on connecting pipe 7 has a value, 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 turn on. In this state, the system recycles activated carbon adsorber 2, the switching valve 2 and switching valve 4 of activated carbon adsorber 2 are closed, and the switching valve 6 and switching valve 8 are opened. When the wind speed monitor 2 on connecting pipe 8 has no value, 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 turn on. The timing module is closed, and the solvent in the activated carbon adsorber is recovered by water vapor. The recovered gas enters cooler one and cooler two for condensation, and then enters the gas-liquid separator. After the recovery of activated carbon adsorber two is completed, the reset module in the time accumulation module of activated carbon adsorber two resets the timing module, and then the system uses activated carbon adsorber two for adsorption, the switching valve two and switching valve four of activated carbon adsorber two are opened, the switching valve six and switching valve eight are closed, and then the activated carbon adsorber one is recovered, the switching valve one and switching valve three of activated carbon adsorber one are closed, the switching valve four and switching valve of adsorber one are opened, and the solvent in activated carbon adsorber one is recovered by water vapor. The recovered gas enters cooler one and cooler two for condensation, and then enters the gas-liquid separator. After the recovery of activated carbon adsorber one is completed, the reset module in the time accumulation module of activated carbon adsorber one resets the timing module.

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