Flotation gas collection and treatment system for a beneficiation plant

Abstract

The application provides a beneficiation plant flotation gas collecting and processing system, which comprises a flotation gas collecting unit, a cyclone separation device, an alkali washing unit and an adsorption unit. The flotation gas collecting unit is used for collecting the flotation gas of the beneficiation plant and conveying the flotation gas to the cyclone separation device. The cyclone separation device is used for separating the ore powder in the flotation gas entering the cyclone separation device and obtaining a first gas. The alkali washing unit is used for washing the hydrogen sulfide in the first gas entering the alkali washing unit by alkali solution and obtaining a second gas. The adsorption unit is used for adsorbing the hydrogen sulfide, carbon disulfide, VOCs and mercaptan in the second gas entering the adsorption unit and obtaining a third gas. An exhaust pipe is in communication with the gas outlet of the adsorption unit and is used for exhausting the third gas to the outside of the beneficiation plant, and a first air blower is arranged on the exhaust pipe. The volatile peculiar smell pollutants such as H2S, CS2, VOCs and mercaptan in the flotation gas are treated and then exhausted to the outside of the beneficiation plant, so that the pollution caused by the gas emission of the beneficiation plant to the environment is reduced.

Description

Technical Field

[0001] This application relates to the field of mineral processing technology, and in particular to a flotation gas collection and processing system for a mineral processing workshop. Background Technology

[0002] Mineral processing is the process of separating valuable minerals from gangue minerals by crushing and grinding the ore according to the physical and chemical properties of different minerals in it, and then using methods such as gravity separation, flotation, magnetic separation, and electrostatic separation. This process also aims to separate various associated (symbiotic) valuable minerals as much as possible, remove or reduce harmful impurities, and obtain raw materials needed for smelting or other industries. Taking copper-molybdenum ore as an example, the beneficiation process involves mixed flotation of copper-molybdenum ore, separate flotation of copper-molybdenum ore, and washing and re-grinding of molybdenum concentrate. Particularly in the copper-molybdenum ore separation process, kerosene (containing thiols) and No. 2 oil (whose main component is terpineol C) are used. 10 H 17 Flotation reagents such as OH, sodium hydrosulfide, and PJ-053 (main components: alkylbenzotriazole, alkyl dithiophosphate, dialkyl thiocarbamate) contain odorous or volatile substances, generating flotation gases that primarily contain volatile pollutants such as H2S, CS2, VOCs, and thiols. Furthermore, the air contains water vapor after the flotation foam breaks, and a certain amount of fine concentrate dust is also generated at the work site. If these flotation gases, water vapor, and fine concentrate dust are not treated promptly, they will not only corrode machinery and equipment but also deteriorate the workshop operating environment, posing health and safety hazards. Therefore, this application proposes a flotation gas collection and treatment system for a mineral processing workshop. Utility Model Content

[0003] This application provides a flotation gas collection and treatment system for a mineral processing workshop to solve the technical problems described in the background art.

[0004] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0005] This application provides a flotation gas collection and treatment system for a mineral processing workshop, comprising: a flotation gas collection unit, a cyclone separator, an alkaline washing unit, and an adsorption unit connected sequentially through a first pipeline;

[0006] The flotation gas collection unit is used to collect flotation gas from the mineral processing workshop and transport the flotation gas to the cyclone separator.

[0007] The cyclone separator is used to separate mineral powder from the flotation gas entering it and obtain a first gas;

[0008] The alkaline washing unit is used to wash the hydrogen sulfide in the first gas entering it with an alkaline solution and obtain the second gas.

[0009] The adsorption unit is used to adsorb hydrogen sulfide, carbon disulfide, VOCs and mercaptans in the second gas that enters it and obtain a third gas.

[0010] An exhaust pipe is connected to the outlet of the adsorption unit and is used to discharge the third gas outside the mineral processing workshop, and a first induced draft fan is installed on it.

[0011] Optionally, the flotation gas collection unit includes a first gas collecting pipe and a plurality of second gas collecting pipes;

[0012] Two of the second gas collecting pipes are connected at one end to both ends of the first gas collecting pipe, and the remaining two gas collecting pipes are connected at one end to the pipe body of the first gas collecting pipe. The other end of each of the multiple second gas collecting pipes is provided with a gas collecting hood.

[0013] The first pipe is connected to the first gas collecting pipe at the end furthest from the cyclone separator, and a second induced draft fan is provided on each of the second gas collecting pipes.

[0014] Optionally, the bottom of the cyclone separator is connected to a mineral powder collection pipe, and the end of the mineral powder collection pipe away from the cyclone separator is connected to a mineral powder storage tank.

[0015] The mineral powder collection pipe is equipped with a discharge valve.

[0016] Optionally, the alkaline washing unit includes an alkaline washing tower and an alkaline solution pipe;

[0017] The end of the first pipe away from the cyclone separator is connected to the lower section of the alkaline washing tower, the end of the first pipe away from the adsorption unit is connected to the top of the alkaline washing tower, and one end of the alkaline liquid pipe is connected to the upper section of the alkaline washing tower and the other end is used to connect to the alkaline liquid storage tank.

[0018] The alkali pipe located inside the alkali washing tower is equipped with spray heads that spray towards the inner bottom of the alkali washing tower, and a first delivery pump is installed on it.

[0019] Optionally, the bottom of the alkaline washing tower is connected to a wastewater collection pipe, one end of the wastewater collection pipe is connected to a wastewater treatment tank, and a second delivery pump is installed on the pipe body near the wastewater treatment tank.

[0020] Optionally, the adsorption unit includes an adsorption box and an adsorption tower that are interconnected by a second pipe;

[0021] The adsorption box has multiple adsorption layers arranged from top to bottom, and the adsorption tower is equipped with carbon disulfide molecular sieves. The end of the first pipe away from the alkaline washing unit is connected to the lower section of the adsorption box and is located below the lowest adsorption layer in the adsorption box. The second pipe is connected to the upper section of the adsorption box and is located above the uppermost adsorption layer in the adsorption box.

[0022] The two ends of the second pipe are respectively connected to the top of the adsorption box and the bottom of the adsorption tower, and the exhaust pipe is connected to the top of the adsorption tower.

[0023] Optionally, the flotation gas collection and treatment system in the mineral processing workshop of this application may also include an incinerator;

[0024] The air inlet of the incinerator is connected to the air outlet of the adsorption unit through a third pipe, and the exhaust pipe is connected to the air outlet of the incinerator, with a waste heat utilization device connected to the end of the exhaust pipe away from the incinerator.

[0025] The flotation gas collection and treatment system for the mineral processing workshop provided in this application collects the flotation gas in the mineral processing workshop through a flotation gas collection unit, separates the mineral powder in the flotation gas through a cyclone separator to obtain a first gas free of mineral powder, treats the acidic gases such as hydrogen sulfide in the first gas through an alkaline washing unit to obtain a second gas, and finally treats the hydrogen sulfide, carbon disulfide, VOCs and mercaptans in the second gas through an adsorption unit to remove hydrogen sulfide, carbon disulfide, VOCs and mercaptans in the second gas to obtain a third gas, which is discharged outside the mineral processing workshop through an exhaust pipe. In other words, this application not only collects the flotation gas in the mineral processing workshop, avoiding corrosion of mechanical equipment, deterioration of the workshop operating environment, and harm to the health of workers in the mineral processing workshop caused by the reaction of flotation gas with water vapor, but also treats volatile odor pollutants such as H2S, CS2, VOCs, and mercaptans in the flotation gas through a cyclone separator, an alkaline washing unit, and an adsorption unit before discharging them outside the mineral processing workshop, thereby reducing the pollution caused by gas emissions from the mineral processing workshop to the environment. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A flowchart of a flotation gas collection and treatment system for a mineral processing workshop provided in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the structure of a flotation gas collection and treatment system in a mineral processing workshop according to an embodiment of this application;

[0029] Figure 3 A schematic diagram of the structure of a flotation gas collection and treatment system in a mineral processing workshop provided in another embodiment of this application;

[0030] Figure 4 This is a schematic diagram of a structure provided in an embodiment of the present application, showing an alkali pipe extending into an alkali washing tower with a spray head installed on the pipe body.

[0031] In the diagram: 100, mineral processing workshop; 101, first pipeline; 102, second pipeline; 103, third pipeline; 200, flotation gas collection unit; 201, first gas collecting pipe; 202, second gas collecting pipe; 2021, gas collecting hood; 2022, second induced draft fan; 300, cyclone separator; 301, mineral powder collection pipe; 3011, mineral powder storage tank; 3012, unloading valve; 400, alkali washing unit; 401, alkali washing tower; 4 02. Alkali solution pipe; 4021. Alkali solution storage tank; 4022. Spray head; 4023. First transfer pump; 500. Adsorption unit; 501. Adsorption box; 5011. Adsorption layer; 502. Adsorption tower; 5021. Carbon disulfide molecular sieve; 600. Exhaust pipe; 601. First induced draft fan; 700. Wastewater collection pipe; 701. Wastewater treatment pool; 702. Second transfer pump; 800. Incinerator; 900. Waste heat recovery device. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0033] refer to Figures 1 to 4 This application provides a flotation gas collection and treatment system for a mineral processing workshop, comprising: a flotation gas collection unit 200, a cyclone separator 300, an alkaline washing unit 400, and an adsorption unit 500 connected in sequence through a first pipeline 101.

[0034] The flotation gas collection unit 200 is used to collect the flotation gas from the mineral processing workshop 100 and transport the flotation gas to the cyclone separator 300; wherein, the cyclone separator 300 can be a cyclone separator.

[0035] Cyclone separator 300 is used to separate mineral powder from flotation gas entering it and obtain a first gas; wherein the first gas mainly contains volatile odor pollutants such as H2S, CS2, VOCs, and mercaptans.

[0036] The alkaline washing unit 400 is used to wash the hydrogen sulfide in the first gas entering it with alkaline solution to obtain the second gas; wherein, the alkaline washing unit 400 is mainly used to treat the acidic gas in the first gas with alkaline solution.

[0037] The adsorption unit 500 is used to adsorb hydrogen sulfide, carbon disulfide, VOCs and thiols in the second gas entering it and obtain a third gas; wherein the third gas is a gas that contains as little as possible volatile odor pollutants such as hydrogen sulfide, carbon disulfide, VOCs and thiols.

[0038] An exhaust pipe 600 is connected to the outlet of the adsorption unit 500 and is used to discharge the third gas outside the mineral processing workshop 100. A first induced draft fan 601 is installed on the exhaust pipe 600. The first induced draft fan 601 is used to provide the flow power for the flotation gas in the mineral processing workshop 100 from the flotation gas collection unit 200, the cyclone separator 300, the alkali unit 400, and the adsorption unit 500 to the exhaust pipe 600.

[0039] The flotation gas collection and treatment system for the mineral processing workshop provided in this application collects the flotation gas from the mineral processing workshop 100 through a flotation gas collection unit 200, separates the mineral powder in the flotation gas through a cyclone separator 300 to obtain a first gas free of mineral powder, treats the acidic gases such as hydrogen sulfide in the first gas through an alkaline washing unit 400 to obtain a second gas, and finally treats the hydrogen sulfide, carbon disulfide, VOCs and mercaptans in the second gas through an adsorption unit 500 to remove hydrogen sulfide, carbon disulfide, VOCs and mercaptans from the second gas to obtain a third gas, which is discharged to the outside of the mineral processing workshop 100 through an exhaust pipe 600. In other words, this application not only collects the flotation gas from the mineral processing workshop 100, avoiding corrosion of mechanical equipment, deterioration of the workshop operating environment, and harm to the health of workers in the mineral processing workshop caused by the reaction of flotation gas with water vapor, but also treats volatile odor pollutants such as H2S, CS2, VOCs, and mercaptans in the flotation gas through the cyclone separator 300, the alkali washing unit 400, and the adsorption unit 500 in sequence before discharging them outside the mineral processing workshop 100, thereby reducing the pollution caused by gas emissions from the mineral processing workshop 100 to the environment.

[0040] In some embodiments, reference Figure 2 and Figure 3The flotation gas collection unit 200 in this application includes a first gas collecting pipe 201 and a plurality of second gas collecting pipes 202; the number of second gas collecting pipes 202 depends on the volume of the mineral processing workshop 100, therefore, this application does not specifically limit it. In addition, the plurality of second gas collecting pipes 202 are respectively arranged above the flotation gas generated in the mineral processing workshop 100.

[0041] Specifically, one end of each of the two second gas collecting pipes 202 is connected to both ends of the first gas collecting pipe 201, and one end of each of the remaining second gas collecting pipes 202 is connected to the pipe body of the first gas collecting pipe 201. The other end of each of the multiple second gas collecting pipes 202 is provided with a gas collecting hood 2021. The shape, size, etc. of the gas collecting hood 2021 can be set according to actual needs, and this application does not impose specific limitations on it.

[0042] The first pipe 101 is connected to the first gas collecting pipe 201 at the end away from the cyclone separator 300, and a second induced draft fan 2022 is provided on each second gas collecting pipe 202.

[0043] In the above embodiment, multiple second gas collecting pipes 202 are installed above the equipment generating flotation gas in the mineral processing workshop 100. The second induced draft fan 2022 corresponding to each second gas collecting pipe 202 is turned on, thereby collecting the flotation gas from the flotation workshop 100 through the gas collecting hood 2021 and the second gas collecting pipes 202 into the first gas collecting pipe 201, thus achieving the collection of flotation gas from the mineral processing workshop 100. Furthermore, the second induced draft fan 2022 is installed on each second gas collecting pipe 202 to ensure the collection efficiency of the flotation gas from the mineral processing workshop 100. The flotation gas collected by the multiple second gas collecting pipes 202 converges into the first gas collecting pipe 201, facilitating centralized processing of the flotation gas collected in the mineral processing workshop 100.

[0044] In some embodiments, reference Figure 2 and Figure 3 In this application, the bottom of the cyclone separator 300 is connected to a mineral powder collection pipe 301, and the end of the mineral powder collection pipe 301 away from the cyclone separator 300 is connected to a mineral powder storage tank 3011. The mineral powder separated by the cyclone separator 300 is collected through the mineral powder storage tank 3011, thereby realizing the recovery of mineral powder particles mixed in the flotation gas and improving the mineral powder recovery efficiency.

[0045] In addition, a discharge valve 3012 is installed on the ore powder collection pipe 301. The discharge valve 3012 controls the flow of ore powder from the cyclone separator 300 into the ore powder storage tank 3011 and measures the amount of ore powder entering the ore powder storage tank 3011, so as to facilitate the monitoring of the ore powder collection during the flotation gas collection and processing.

[0046] In some embodiments, reference Figures 2 to 4 The alkaline washing unit 400 in this application includes an alkaline washing tower 401 and an alkaline solution pipe 402. Specifically, one end of the first pipe 101 away from the cyclone separator 300 is connected to the lower section of the alkaline washing tower 401, and the other end of the first pipe 101 away from the adsorption unit 500 is connected to the top of the alkaline washing tower 401. One end of the alkaline solution pipe 402 is connected to the upper section of the alkaline washing tower 401, and the other end is used to connect to the alkaline solution storage tank 4021. The alkaline solution filled in the alkaline washing tower 401 can be a sodium hydroxide solution or other alkaline solutions, which can be prepared according to actual needs, and this application does not specifically limit it.

[0047] In addition, the alkali pipe 402 located inside the alkali washing tower 401 is equipped with spray heads 4022 that spray towards the inner bottom of the alkali washing tower 401, and a first transfer pump 4023 is installed on it. The number of spray heads 4022 can be set according to the actual situation, and this application does not make a specific limitation on it.

[0048] In the above embodiment, the first delivery pump 4023 is turned on, and the alkaline solution in the alkaline solution storage tank 4021 is sprayed from top to bottom in the alkaline washing tower 401 through the alkaline solution pipe 402 and the spray head 4022. As the alkaline solution falls from top to bottom, it is subjected to alkaline washing with the first gas that diffuses from bottom to top in the alkaline washing tower 401, thereby removing acidic gases such as H2S from the first gas and obtaining the second gas, thus achieving the removal of acidic gases.

[0049] In some embodiments, reference Figure 2 and Figure 3 In this application, the bottom end of the alkaline washing tower 401 is connected to a wastewater collection pipe 700, one end of the wastewater collection pipe 700 is connected to a wastewater treatment tank 701, and a second delivery pump 702 is installed on the pipe body of the wastewater collection pipe 700 near the wastewater treatment tank 701.

[0050] In the above embodiments, the wastewater after treating acidic gases such as H2S with the alkaline solution in the alkaline washing tower 401 is transported to the wastewater treatment tank 701 through the bottom of the alkaline washing tower 401 and the wastewater collection pipe 700. This ensures that while treating acidic gases such as H2S in the flotation gas, the wastewater from the alkaline washing process is not arbitrarily discharged and is treated, thereby achieving the treatment and subsequent use of alkaline washing wastewater, thus saving water resources. In some embodiments, reference Figure 2 and Figure 3The adsorption unit 500 in this application includes an adsorption box 501 and an adsorption tower 502 that are interconnected by a second pipe 102. Specifically, the adsorption box 501 has multiple adsorption layers 5011 arranged from top to bottom, and the adsorption tower 502 has a carbon disulfide molecular sieve 5021. The end of the first pipe 101 away from the alkali washing unit 400 is connected to the lower section of the adsorption box 501 and is located below the lowest adsorption layer 5011 in the adsorption box 501. The second pipe 102 is connected to the upper section of the adsorption box 501 and is located above the uppermost adsorption layer 5011 in the adsorption box 501. The adsorption layer 5011 can be an activated carbon layer and its number can be set according to actual needs, but this application does not specifically limit it.

[0051] In addition, the two ends of the second pipe 102 are respectively connected to the top of the adsorption box 501 and the bottom of the adsorption tower 502, and the exhaust pipe 600 is connected to the top of the adsorption tower 502.

[0052] In the above embodiments, the second gas contains gases such as H2S, CS2, VOCs, and thiols, which are adsorbed by multiple adsorption layers 5011 in the adsorption box 501. Then, the carbon disulfide is treated again by the carbon disulfide molecular sieve 5021 in the adsorption tower 502, so as to minimize the presence of H2S, CS2, VOCs, and thiols in the treated third gas, thereby ensuring that the third gas discharged from the mineral processing workshop 100 to the atmosphere will not cause environmental pollution.

[0053] In some embodiments, reference Figure 3 The flotation gas collection and treatment system in the mineral processing workshop of this application also includes an incinerator 800; the specifications and model of the incinerator 800 can be set according to the actual situation, and this application does not make specific limitations on it.

[0054] Specifically, the air inlet of the incinerator 800 is connected to the air outlet of the adsorption unit 500 through the third pipe 103, and the exhaust pipe 600 is connected to the air outlet of the incinerator 800, with the end of the exhaust pipe away from the incinerator 800 connected to the waste heat utilization device 900. The waste heat utilization device 900 can be a waste heat utilization device used by the ore dressing plant itself, such as a compression heat source pump, a slurry heat exchanger, etc., depending on the actual situation, and this application does not specifically limit it.

[0055] In the above embodiments, when the concentration of VOCs is high, the adsorption unit 500 alone may not be able to completely treat them. Therefore, in order to ensure the treatment efficiency of VOCs, they can be oxidized and incinerated at high temperature in the incinerator 800 to convert them into harmless substances (such as carbon dioxide and water) as much as possible. The gas generated by the incinerator 800 during the incineration process will have a large amount of heat. By passing this heat into the waste heat utilization device 900, the heat generated by the incinerator 800 during the incineration of VOCs can be effectively utilized.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A flotation gas collection and treatment system for a mineral processing workshop, characterized in that, include: The flotation gas collection unit (200), cyclone separator (300), alkaline washing unit (400) and adsorption unit (500) are connected in sequence through the first pipeline (101). The flotation gas collection unit (200) is used to collect flotation gas from the mineral processing workshop (100) and transport the flotation gas to the cyclone separator (300). The cyclone separator (300) is used to separate the mineral powder from the flotation gas entering it and obtain a first gas; The alkaline washing unit (400) is used to wash the hydrogen sulfide in the first gas entering it with an alkaline solution and obtain the second gas. The adsorption unit (500) is used to adsorb hydrogen sulfide, carbon disulfide, VOCs and mercaptans in the second gas entering it and obtain a third gas. An exhaust pipe (600) is connected to the outlet of the adsorption unit (500) and is used to discharge the third gas to the outside of the mineral processing workshop (100), and a first induced draft fan (601) is provided on it.

2. The flotation gas collection and treatment system for a mineral processing workshop according to claim 1, characterized in that, The flotation gas collection unit (200) includes a first gas collecting pipe (201) and a plurality of second gas collecting pipes (202). Two of the second gas collecting pipes (202) are connected at one end to both ends of the first gas collecting pipe (201), and one end of the remaining second gas collecting pipes (202) is connected to the pipe body of the first gas collecting pipe (201). The other end of the multiple second gas collecting pipes (202) is provided with a gas collecting hood (2021). The first pipe (101) is connected to the first gas collecting pipe (201) at the end away from the cyclone separator (300), and a second induced draft fan (2022) is provided on each second gas collecting pipe (202).

3. The flotation gas collection and treatment system for a mineral processing workshop according to claim 1, characterized in that, The bottom of the cyclone separator (300) is connected to a mineral powder collection pipe (301), and the end of the mineral powder collection pipe (301) away from the cyclone separator (300) is connected to a mineral powder storage tank (3011). The mineral powder collection pipe (301) is equipped with a discharge valve (3012).

4. The flotation gas collection and treatment system for a mineral processing workshop according to claim 1, characterized in that, The alkaline washing unit (400) includes an alkaline washing tower (401) and an alkaline liquid pipe (402). The first pipe (101) is connected at one end away from the cyclone separator (300) to the lower section of the alkaline washing tower (401), and at the other end away from the adsorption unit (500) to the top of the alkaline washing tower (401). One end of the alkaline pipe (402) is connected to the upper section of the alkaline washing tower (401), and the other end is used to connect to the alkaline storage tank (4021). The alkali pipe (402) located inside the alkali washing tower (401) is provided with a spray head (4022) that sprays towards the inner bottom of the alkali washing tower (401), and a first delivery pump (4023) is provided on it.

5. The flotation gas collection and treatment system for a mineral processing workshop according to claim 4, characterized in that, The bottom end of the alkaline washing tower (401) is connected to a wastewater collection pipe (700), one end of the wastewater collection pipe (700) is connected to a wastewater treatment tank (701), and a second transfer pump (702) is installed on the pipe body of the wastewater collection pipe (700) near the wastewater treatment tank (701).

6. The flotation gas collection and treatment system for a mineral processing workshop according to claim 1, characterized in that, The adsorption unit (500) includes an adsorption box (501) and an adsorption tower (502) that are interconnected by a second pipe (102). The adsorption box (501) is provided with multiple adsorption layers (5011) from top to bottom, and the adsorption tower (502) is provided with carbon disulfide molecular sieve (5021). The end of the first pipe (101) away from the alkaline washing unit (400) is connected to the lower section of the adsorption box (501) and is located below the lowest adsorption layer (5011) in the adsorption box (501). The second pipe (102) is connected to the upper section of the adsorption box (501) and is located above the uppermost adsorption layer (5011) in the adsorption box (501). The two ends of the second pipe (102) are respectively connected to the top of the adsorption box (501) and the bottom of the adsorption tower (502), and the exhaust pipe (600) is connected to the top of the adsorption tower (502).

7. The flotation gas collection and treatment system for a mineral processing workshop according to any one of claims 1 to 6, characterized in that, It also includes an incinerator (800); The air inlet of the incinerator (800) is connected to the air outlet of the adsorption unit (500) through a third pipe (103). The exhaust pipe (600) is connected to the air outlet of the incinerator (800), and the end of the exhaust pipe away from the incinerator (800) is connected to a waste heat utilization device (900).

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