Carbon capture anti-corrosion system

Abstract

The invention discloses a carbon capture anti-corrosion system, and relates to the technical field of carbon capture. The carbon capture anti-corrosion system comprises an absorption tower, a desorption tower, a heat exchanger, a first spray head and a second spray head, the absorption tower is connected with a smoke inlet pipe, a first liquid discharge pipe and a first liquid inlet pipe, the desorption tower is connected with an exhaust pipe, a second liquid discharge pipe and a second liquid inlet pipe, and the heat exchanger is provided with a first heat exchange channel and a second heat exchange channel. The two ends of the first heat exchange channel are connected with the first liquid discharging pipe and the second liquid discharging pipe respectively, the two ends of the second heat exchange channel are connected with the first liquid feeding pipe and the second liquid discharging pipe respectively, the first spray head is arranged on the smoke inlet pipe and used for spraying barren liquor, and the second spray head is arranged on the desorption tower and used for spraying the barren liquor to the tower wall of the desorption tower. According to the carbon capture anti-corrosion system, the wet corrosion phenomenon occurring during operation of the carbon capture system can be effectively inhibited, the continuous production capacity of the carbon capture system is guaranteed, and the capital construction and operation cost of system equipment is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon capture, and specifically, to a carbon capture anti-corrosion system. Background Art

[0002] When capturing and recycling carbon dioxide from flue gas, amine solution is often used as an absorbent to absorb and desorb carbon dioxide. However, during the operation of the entire system, a large amount of carbon dioxide gas accumulates at the inlet position of the absorption tower and the exhaust position of the desorption tower. By dissolving carbon dioxide in water to form an acidic solution, the acidic solution reacts with the equipment materials, thereby triggering wet corrosion, seriously affecting the continuous production capacity of the carbon capture system, and increasing the capital construction and operation costs of the system facilities. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to some extent.

[0004] To this end, an embodiment of the present invention provides a carbon capture anti-corrosion system, which can effectively inhibit the wet corrosion phenomenon occurring during the operation of the carbon capture system, ensure the continuous production capacity of the carbon capture system, and reduce the capital construction and operation costs of the system equipment.

[0005] The carbon capture anti-corrosion system according to an embodiment of the present invention includes:

[0006] An absorption tower, which is connected with a flue gas inlet pipe, a first drain pipe, and a first inlet pipe;

[0007] A desorption tower, which is connected with an exhaust pipe, a second drain pipe, and a second inlet pipe;

[0008] A heat exchanger, which has a first heat exchange channel and a second heat exchange channel. The two ends of the first heat exchange channel are respectively connected with the first drain pipe and the second inlet pipe for transporting the rich liquid generated by the absorbent absorbing carbon dioxide, and the two ends of the second heat exchange channel are respectively connected with the first inlet pipe and the second drain pipe for transporting the lean liquid generated by the desorption of carbon dioxide from the rich liquid;

[0009] A first spray head and a second spray head. The first spray head is arranged on the flue gas inlet pipe and is used for spraying lean liquid, and the second spray head is arranged corresponding to the exhaust pipe on the desorption tower, and the second spray head is used for spraying lean liquid on the tower wall of the desorption tower.

[0010] The carbon capture anti-corrosion system according to an embodiment of the present invention can effectively inhibit the wet corrosion phenomenon occurring during the operation of the carbon capture system, ensure the continuous production capacity of the carbon capture system, and reduce the capital construction and operation costs of the system equipment.

[0011] In some embodiments, a first condensing unit is included. The first condensing unit is arranged upstream of the smoke inlet pipe, and the first condensing unit is used to condense and remove moisture in the carbon-containing flue gas.

[0012] In some embodiments, a pre-wash tower is included, the pre-wash tower is provided with a washing section and a smoke exhaust port, the first condensing unit is provided on a side of the washing section close to the smoke exhaust port, and the smoke exhaust port is connected to the smoke inlet pipe.

[0013] In some embodiments, the first condensing unit includes a first packing layer, a first liquid collecting tower tray and a first circulation pipe, cooling water flows in the first packing layer, the first liquid collecting tower tray is arranged on a side of the first packing layer close to the washing section and is used to collect cooling water, one end of the first circulation pipe is connected to the first liquid collecting tower tray, and the other end of the first circulation pipe is arranged on a side of the first packing layer away from the first liquid collecting tower tray and is used to transport cooling water.

[0014] In some embodiments, a second condensing unit is included, and the second condensing unit is arranged in the desorption tower corresponding to the exhaust pipe, and the second condensing unit is used to condense and remove moisture in the gas in the desorption tower.

[0015] In some embodiments, the second condensing unit includes a condensing pipe network, which is arranged in the desorption tower and located on the side of the connection position between the second liquid inlet pipe and the desorption tower close to the second nozzle, and coolant flows in the condensing pipe network.

[0016] In some embodiments, the first nozzle is connected to a first infusion tube, the other end of the first infusion tube is connected to the first liquid inlet tube, and the ratio of the flow rate of the first infusion tube to the flow rate of the first liquid inlet tube is in the range of 1%-3%.

[0017] In some embodiments, the second nozzle is connected to a second infusion tube, the other end of the second infusion tube is connected to the second drainage tube, and the ratio of the flow rate of the second infusion tube to the flow rate of the second drainage tube is in the range of 1%-3%.

[0018] In some embodiments, a gas-liquid separation tower is included, the gas-liquid separation tower is connected to the exhaust pipe, the gas-liquid separator is connected to a third liquid discharge pipe, and the other end of the third liquid discharge pipe is connected to the second nozzle.

[0019] In some embodiments, the second nozzle is provided with a plurality of nozzles spaced apart along the circumferential direction, and the axis of the nozzle is arranged at an angle to the axis of the desorption tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The invention relates to a carbon capture and anti-corrosion system according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] Absorption tower 1; flue gas inlet pipe 11; first drain pipe 12; first liquid inlet pipe 13;

[0023] Desorption tower 2; exhaust pipe 21; second drain pipe 22; second liquid inlet pipe 23;

[0024] Heat exchanger 3;

[0025] First spray head 4; first liquid delivery pipe 41;

[0026] Second spray head 5; second liquid delivery pipe 51;

[0027] First condensation unit 6; first packing layer 61; first circulation pipe 62;

[0028] Pre-washing tower 7; washing section 71;

[0029] Second condensation unit 8;

[0030] Gas-liquid separation tower 9; third drain pipe 91. Detailed implementation manners

[0031] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention.

[0032] As Figure 1 shown, the carbon capture and anti-corrosion system of the embodiment of the present invention includes an absorption tower 1, a desorption tower 2, a heat exchanger 3, a first spray head 4 and a second spray head 5. The absorption tower 1 is connected with a flue gas inlet pipe 11, a first drain pipe 12 and a first liquid inlet pipe 13. The desorption tower 2 is connected with an exhaust pipe 21, a second drain pipe 22 and a second liquid inlet pipe 23. The heat exchanger 3 has a first heat exchange channel and a second heat exchange channel. The two ends of the first heat exchange channel are respectively connected with the first drain pipe 12 and the second liquid inlet pipe 23 for transporting the rich liquid generated by the absorbent absorbing carbon dioxide. The two ends of the second heat exchange channel are respectively connected with the first liquid inlet pipe 13 and the second drain pipe 22 for transporting the lean liquid generated by the desorption of carbon dioxide from the rich liquid. The first spray head 4 is arranged on the flue gas inlet pipe 11 and is used for spraying the lean liquid. The second spray head 5 is arranged corresponding to the exhaust pipe 21 on the desorption tower 2, and the second spray head 5 is used for spraying the lean liquid on the tower wall of the desorption tower 2.

[0033] When the carbon capture anti-corrosion system according to the embodiment of the present invention is in use, the carbon-containing flue gas enters the absorption tower 1 through the inlet flue pipe 11. When the carbon-containing flue gas passes through the inlet flue pipe 11, the first spray head 4 sprays lean liquid to combine the lean liquid with the water vapor in the carbon-containing flue gas, so as to inhibit the generation of an acidic environment on the pipe wall of the inlet flue pipe 11 and avoid wet corrosion at the connection position between the inlet flue pipe 11 and the absorption tower 1. After the carbon-containing flue gas enters the absorption tower 1, it moves from the bottom to the top of the absorption tower 1 and reacts with the absorbent in the absorption tower 1 in a countercurrent manner to generate rich liquid. The rich liquid enters the desorption tower 2 through the first drain pipe 12, the first heat exchange channel and the second inlet pipe 23. The rich liquid reacts with the steam in the desorption tower 2 in a countercurrent manner to desorb carbon dioxide. The carbon dioxide and steam gather at the top of the desorption tower 2 and are discharged through the exhaust pipe 21 to collect the captured carbon dioxide. By opening the second spray head 5, the second spray head 5 sprays lean liquid on the tower wall at the top of the desorption tower 2 to form a lean liquid film layer on the tower wall of the desorption tower 2. Thus, after the steam condenses on the tower wall to form water, carbon dioxide dissolves in the water to generate an acidic environment and corrode the desorption tower 2.

[0034] The carbon capture anti-corrosion system according to the embodiment of the present invention can effectively inhibit the wet corrosion phenomenon occurring during the operation of the carbon capture system, ensure the continuous production capacity of the carbon capture system, and reduce the capital construction and operation costs of the system equipment.

[0035] In some embodiments, as Figure 1 shown, it includes a first condensation unit 6. The first condensation unit 6 is arranged upstream of the inlet flue pipe 11 and is used for condensing and removing the moisture in the carbon-containing flue gas. By setting the first condensation unit 6, the moisture in the carbon-containing flue gas entering the inlet flue pipe 11 can be condensed and removed, avoiding the condensation of water vapor in the inlet flue pipe 11, further reducing the possibility of generating an acidic environment in the inlet flue pipe 11, and ensuring the anti-corrosion protection of the pipeline.

[0036] In some embodiments, as Figure 1 shown, it includes a pre-washing tower 7. The pre-washing tower 7 is provided with a washing section 71 and an exhaust port. The first condensation unit 6 is arranged on the side of the washing section 71 close to the exhaust port, and the exhaust port is connected to the inlet flue pipe 11.

[0037] Specifically, the pre-washing tower 7 includes an inlet flue. The washing section 71 is provided with a washing packing layer, and a washing liquid circulates in the washing packing layer. The impurities (particulates, sulfur oxides, nitrogen oxides) in the carbon-containing flue gas are removed after being washed by the washing liquid in the washing section 71, and the flue gas temperature is reduced, which can reduce the moisture in the carbon-containing flue gas. By arranging the first condensation unit 6 in the pre-washing tower 7, it is convenient to collect the water body condensed and removed by the first condensation unit 6, and the pipeline setting can be reduced, ensuring the anti-corrosion protection of the inlet flue pipe 11.

[0038] In some embodiments, as Figure 1As shown, the first condensing unit 6 includes a first packing layer 61, a first liquid collecting tower plate and a first circulation pipe 62. Cooling water flows in the first packing layer 61. The first liquid collecting tower plate is arranged on a side of the first packing layer 61 close to the washing section 71 and is used to collect cooling water. One end of the first circulation pipe 62 is connected to the first liquid collecting tower plate, and the other end of the first circulation pipe 62 is arranged on a side of the first packing layer 61 away from the first liquid collecting tower plate and is used to transport cooling water.

[0039] Specifically, the cooling water in the first packing layer 61 is collected through the first liquid collecting tower plate, and the collected cooling water is transported to the first packing layer 61 again through the first circulation pipe 62. The carbon-containing flue gas washed with the washing liquid is reversely contacted with the cooling water in the first packing layer 61, and the cooling water further cools the carbon-containing flue gas to condense the moisture in the carbon-containing flue gas in the first packing layer 61, so as to remove the moisture in the carbon-containing flue gas, and effectively alleviate the wet carbon dioxide corrosion problem at the connection position of the smoke inlet pipe 11 and the absorption tower 1.

[0040] Optionally, the first filler layer 61 uses a hollow polytetrafluoroethylene filler to ensure the anti-corrosion performance of the first filler layer 61 .

[0041] Optionally, a first heat exchange unit is provided on the first circulation pipe 62 , and the first heat exchange unit is used to cool down the cooling water in the first circulation pipe 62 .

[0042] In some embodiments, Figure 1 As shown, it includes a second condensing unit 8, which is arranged in the desorption tower 2 corresponding to the exhaust pipe 21, and is used for condensing and removing moisture in the gas in the desorption tower 2.

[0043] In the desorption tower 2, the gas mixture of carbon dioxide desorbed from the rich liquid and the steam in the desorption tower 2 moves toward the top of the desorption tower 2. When the second condensation unit 8 condenses the gas mixture, the water in the gas mixture condenses at the position of the second condensation unit 8, and the amount of water vapor in the gas mixture condensed at the top of the desorption tower 2 is reduced, so as to avoid the formation of an acidic environment at the top of the desorption tower 2 to corrode the desorption tower 2, thereby effectively improving the protection of the desorption tower 2.

[0044] In some embodiments, the second condensing unit 8 includes a condensing pipe network, which is arranged in the desorption tower 2 and located on the side of the connection position between the second liquid inlet pipe 23 and the desorption tower 2 close to the second nozzle 5, and coolant flows in the condensing pipe network.

[0045] Specifically, the second condensing unit 8 includes a liquid supply tank, a liquid supply pipe and a refrigeration pump. The liquid supply pipe is connected between the liquid supply tank and the condensing pipe network. The refrigeration pump is arranged on the liquid supply pipe. The liquid supply pipe is used to circulate the coolant between the condensing pipe network and the liquid supply tank, and the coolant in the liquid supply pipe is cooled by the refrigeration pump to ensure the cooling effect of the condensing pipe network.

[0046] In some embodiments, Figure 1 As shown, the second condensing unit 8 includes a second packing layer, a second liquid collecting tower plate and a second circulation pipe. Cooling water flows in the second packing layer. The second liquid collecting tower plate is arranged on the side of the second packing layer away from the exhaust pipe 21 and is used to collect cooling water. One end of the second circulation pipe is connected to the second liquid collecting tower plate, and the other end of the second circulation pipe is arranged on the side of the second packing layer away from the second liquid collecting tower plate and is used to transport cooling water.

[0047] Specifically, the cooling water in the second packing layer is collected by the second liquid collecting tower plate, and the collected cooling water is transported to the second packing layer again through the second circulation pipe. The gas mixture composed of carbon dioxide and steam is reversely contacted with the cooling water in the second packing layer. The cooling water further cools the gas mixture so that the moisture in the gas mixture condenses in the second packing layer, which is convenient for removing the moisture in the gas mixture, and effectively alleviates the wet carbon dioxide corrosion problem caused by the accumulation of carbon dioxide gas at the top of the desorption tower 2.

[0048] Optionally, the second packing layer uses hollow polytetrafluoroethylene packing to ensure the anti-corrosion performance of the second packing layer.

[0049] Optionally, a second heat exchange unit is provided on the second circulation pipe, and the second heat exchange unit is used to cool the cooling water in the second circulation pipe.

[0050] In some embodiments, Figure 1 As shown, the first nozzle 4 is connected to a first liquid infusion tube 41, the other end of the first liquid infusion tube 41 is connected to the first liquid inlet tube 13, and the ratio of the flow rate of the first liquid infusion tube 41 to the flow rate of the first liquid inlet tube 13 is in the range of 1%-3%.

[0051] By connecting the first liquid infusion pipe 41 with the first liquid inlet pipe 13, the lean liquid generated by the desorption tower 2 can be directly utilized, which reduces the setting of pipelines, reduces infrastructure costs, and limits the flow of the first liquid infusion pipe 41. While ensuring the normal operation of carbon capture in the absorption tower 1, it ensures the adsorption of water vapor in the carbon-containing flue gas in the smoke inlet pipe 11, effectively inhibits the formation of an acidic environment, and ensures the anti-corrosion effect.

[0052] In some embodiments, Figure 1As shown, the second spray head 5 is connected to a second liquid delivery pipe 51, and the other end of the second liquid delivery pipe 51 is connected to the second liquid discharge pipe 22, and the ratio range of the flow rate of the second liquid delivery pipe 51 to the flow rate of the second liquid discharge pipe 22 is 1% - 3%.

[0053] By connecting the second liquid delivery pipe 51 to the second liquid discharge pipe 22, the lean liquid generated by the desorption tower 2 can be directly utilized, reducing the pipeline installation, lowering the capital construction cost, and restricting the flow rate of the second liquid delivery pipe 51. While ensuring the normal supply of lean liquid to the absorption tower 1, it ensures the spraying of the second spray head 5 on the top tower wall of the desorption tower 2, effectively suppressing the generation of an acidic environment and ensuring the anti-corrosion effect.

[0054] In some embodiments, as Figure 1 shown, it includes a gas-liquid separation tower 9. The gas-liquid separation tower 9 is connected to the exhaust pipe 21. The gas-liquid separator is connected to a third liquid discharge pipe 91, and the other end of the third liquid discharge pipe 91 is connected to the second spray head 5.

[0055] By setting up the gas-liquid separation tower 9, it is convenient to separate the gas mixture composed of carbon dioxide and steam. By condensing the water vapor and part of the evaporated absorbent in the gas mixture, lean liquid is obtained in the gas-liquid separation tower 9. The lean liquid can be transported to the second spray head 5 through the third liquid discharge pipe 91, effectively reducing the waste of the absorbent while ensuring the operation of the second spray head 5.

[0056] In some embodiments, the second spray head 5 is provided with a plurality of nozzles at circumferential intervals, and the axis of the nozzle is arranged at an angle with the axis of the desorption tower 2.

[0057] Specifically, the second spray head 5 is coaxially arranged at the top of the desorption tower 2, and the opening direction of the nozzle faces the tower wall of the desorption tower 2. Through the plurality of nozzles arranged at circumferential intervals on the second spray head 5, when the second nozzle operates, the sprayed lean liquid is sprayed in a conical shape on the top of the desorption tower 2 to form a lean liquid film layer on the side wall of the desorption tower 2, avoiding the formation of an acidic environment on the side wall of the desorption tower 2 due to the enriched carbon dioxide under the action of water, and reducing the corrosion of the desorption tower 2.

[0058] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the 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 should not be construed as a limitation to the present invention.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0060] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "connected to", "fixed" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0061] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0062] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0063] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A carbon capture and anti-corrosion system, characterized in that: include: An absorption tower, wherein the absorption tower is connected to a smoke inlet pipe, a first liquid discharge pipe and a first liquid inlet pipe; A desorption tower, wherein the desorption tower is connected to an exhaust pipe, a second liquid discharge pipe and a second liquid inlet pipe; A heat exchanger, wherein the heat exchanger has a first heat exchange channel and a second heat exchange channel, wherein two ends of the first heat exchange channel are respectively connected to the first liquid discharge pipe and the second liquid inlet pipe for conveying a rich liquid generated by the absorbent absorbing carbon dioxide, and two ends of the second heat exchange channel are respectively connected to the first liquid inlet pipe and the second liquid discharge pipe for conveying a lean liquid generated by the rich liquid desorbing carbon dioxide; A first nozzle and a second nozzle, wherein the first nozzle is arranged at the smoke inlet pipe and is used for spraying lean liquid, and the second nozzle is arranged at the desorption tower corresponding to the exhaust pipe, and the second nozzle is used for spraying lean liquid onto the tower wall of the desorption tower.

2. The carbon capture and corrosion protection system according to claim 1, characterized in that: It comprises a first condensing unit, which is arranged upstream of the smoke inlet pipe and is used for condensing and removing moisture in the carbon-containing flue gas.

3. The carbon capture and corrosion protection system according to claim 2, characterized in that: It comprises a pre-washing tower, which is provided with a washing section and a smoke exhaust port. The first condensing unit is arranged on a side of the washing section close to the smoke exhaust port, and the smoke exhaust port is connected to the smoke inlet pipe.

4. The carbon capture and corrosion protection system according to claim 3, characterized in that: The first condensing unit includes a first packing layer, a first liquid collecting tower plate and a first circulation pipe, cooling water flows in the first packing layer, the first liquid collecting tower plate is arranged on a side of the first packing layer close to the washing section and is used to collect cooling water, one end of the first circulation pipe is connected to the first liquid collecting tower plate, and the other end of the first circulation pipe is arranged on a side of the first packing layer away from the first liquid collecting tower plate and is used to transport cooling water.

5. The carbon capture and anti-corrosion system according to claim 1, characterized in that: It comprises a second condensing unit, which is arranged in the desorption tower corresponding to the exhaust pipe, and is used for condensing and removing moisture in the gas in the desorption tower.

6. The carbon capture and corrosion prevention system according to claim 5, characterized in that: The second condensing unit includes a condensing pipe network, which is arranged in the desorption tower and located on a side of the connection position between the second liquid inlet pipe and the desorption tower close to the second nozzle, and coolant flows in the condensing pipe network.

7. The carbon capture and corrosion protection system according to claim 1, characterized in that: The first nozzle is connected to a first infusion tube, the other end of the first infusion tube is connected to the first liquid inlet tube, and the ratio of the flow rate of the first infusion tube to the flow rate of the first liquid inlet tube is in the range of 1%-3%.

8. The carbon capture and corrosion protection system according to claim 1, characterized in that: The second nozzle is connected to a second infusion tube, the other end of the second infusion tube is connected to the second drainage tube, and the ratio of the flow rate of the second infusion tube to the flow rate of the second drainage tube is in the range of 1%-3%.

9. The carbon capture and corrosion protection system according to claim 1, characterized in that: It comprises a gas-liquid separation tower, which is connected to the exhaust pipe. The gas-liquid separator is connected to a third liquid discharge pipe, and the other end of the third liquid discharge pipe is connected to the second nozzle.

10. The carbon capture and corrosion prevention system according to claim 1, characterized in that: The second nozzle is provided with a plurality of nozzles at intervals along the circumferential direction, and the axis of the nozzle is arranged at an angle with the axis of the desorption tower.

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