Combustible gas recycling device

Abstract

The invention provides a combustible gas recycling device, and relates to the technical field of recycling devices, the combustible gas recycling device comprises a flue gas purification device, two groups of oil-water separators, two groups of combustion furnaces, two groups of first water seal safety devices and two groups of second water seal safety devices, the two sets of oil-water separators, the combustion furnace, the first water seal safety device and the second water seal safety device are communicated through a double-pipe two-way structure, the double-pipe two-way structure comprises a first through pipe and a second through pipe, and the two ends of the first through pipe and the two ends of the second through pipe are communicated with the combustion furnace. And the oil-water separator, the combustion furnace, the first water seal safety device and the second water seal safety device in each group are connected in the same manner. According to the invention, through the arrangement of the double-pipe bidirectional steam cleaning pipeline and the arrangement of the protective sleeve, the problem of unsmooth circulation of combustible gas due to pipeline blockage is effectively solved, and the safety coefficient in the production and processing process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of recycling devices, in particular to a combustible gas recycling device. Background Art

[0002] In the process of thermal cracking of waste tires, the cut waste tires need to be placed in a thermal cracking reactor. The waste tire blocks are heated to a high temperature, usually between 400°C and 600°C, and thermally cracked under conditions of no oxygen or extremely low oxygen. This process will decompose the organic matter in the waste tires into gas, liquid and solid products, and the combustible gas generated is usually recycled.

[0003] Some oily impurities will be produced in the exhaust gas discharged after the cracking is completed. When the gas is transported by pipeline, a single-pipe one-way transportation is usually used. After a long transportation time, there will be a great safety hazard to safe production. Because the combustible gas produced by cracking contains substances such as sodium and silicon, it is easy to produce crystals when the temperature is below 10°C, which will block the pipeline and cause the combustible gas to flow poorly or be unable to flow. Therefore, it is easy to cause excessive pressure. If it is not eliminated in time, there will be a great safety hazard. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that the fuel gas cannot flow due to pipeline blockage, which increases the safety hazards in the production process.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a combustible gas recycling device, including a flue gas purification device, an oil-water separator, a combustion furnace, a first water seal safety device and a second water seal safety device, the oil-water separator, the combustion furnace, the first water seal safety device and the second water seal safety device are each provided with two groups, the two groups of the oil-water separator, the combustion furnace, the first water seal safety device and the second water seal safety device are connected through a double-tube two-way structure, the double-tube two-way structure includes a first through pipe and a second through pipe, the first through pipe and the second through pipe are connected at both ends with the combustion furnace respectively, the connection mode between each group of the oil-water separator, the combustion furnace, the first water seal safety device and the second water seal safety device is the same, the oil-water separator is connected with the feed end of the first water seal safety device through an air inlet pipe, the exhaust end of the second water seal safety device is connected with one end of the second through pipe, the air outlet end of the first water seal safety device is respectively connected with the second water seal safety device and the first through pipe, the output end of the combustion furnace is connected with the flue gas purification device, and the outer walls of the first through pipe and the second through pipe are detachably provided with protective sleeves.

[0006] As a preferred embodiment, the output end of the first water seal safety device is connected to the second water seal safety device and the first through pipe through the first connecting pipe and the second connecting pipe respectively. Through the cooperation of the first through pipe and the second through pipe, double-tube bidirectional gas transportation can be realized.

[0007] As a preferred embodiment, the protective sleeve is a strip structure, an insulation layer is provided on the outside of the protective sleeve, and fleece-surface Velcro and thorn-surface Velcro are respectively provided on the front and back edges of both sides of the protective sleeve, and the fleece-surface Velcro and thorn-surface Velcro are adhered to each other. The fleece-surface Velcro and thorn-surface Velcro make it easy to install the protective sleeve on the outside of the first through pipe and the second through pipe, and the insulation layer can reduce heat loss when the temperature in the first through pipe and the second through pipe is increased.

[0008] As a preferred embodiment, a high-temperature hose is provided on the inner side of the protective sleeve. The high-temperature hose is laid flat in an S shape inside the protective sleeve. The high-temperature hose does not contact the fleece-surface Velcro and the thorn-surface Velcro. Through the high-temperature hose, the high-temperature hose will not be damaged even if the protective sleeve changes any shape during installation or removal. At the same time, the high-temperature hose is made of silicone. The silicone hose can work at a temperature of up to three hundred degrees Celsius and has good flexibility and acid and alkali resistance.

[0009] As a preferred embodiment, the flue gas purification device includes a bag dust collector, a filtering mechanism and a washing mechanism. The output end of the combustion furnace is connected to the filtering mechanism through a bag dust collector. The output end of the filtering mechanism and the air inlet end of the washing mechanism are both connected to a hot air pipe. The two end faces of the hot air pipe are sealed and connected to the two ends of the high-temperature hose. The gas after combustion in the combustion furnace passes through the bag dust collector to remove most of the particulate matter, separates relatively clean gas, and then passes through the filtering mechanism to filter the gas more finely. The gas released by the combustion furnace has a large amount of heat. The high-temperature gas after layer-by-layer filtration enters the high-temperature hose through the hot air pipe, and the first through pipe and the second through pipe are heated, which can effectively avoid the problem of sodium, silicon and other substances crystallizing and causing blockage in the first through pipe and the second through pipe under low temperature conditions. The temperature of the hot air passing through the high-temperature hose gradually decreases, and then enters the washing mechanism through another hot air pipe, and the gas is washed with water by the washing mechanism to further purify the gas.

[0010] As a preferred embodiment, a ceramic filter plate, a high-temperature resistant synthetic fiber filter plate and a metal fiber filter plate are provided inside the filter mechanism. The ceramic filter plate, the high-temperature resistant synthetic fiber filter plate and the metal fiber filter plate are arranged in sequence from the air inlet end to the air outlet end. Through the set filter mechanism, the exhausted gas can be filtered.

[0011] As a preferred embodiment, the washing mechanism includes an outer shell, a water tank and a spray mechanism. The water tank is arranged at the lower part of the inner part of the outer shell. A water pipe is arranged in the water tank. The upper end of the water pipe extends to the outside of the outer shell, and the lower end of the water pipe extends to the bottom of the water in the water tank. The spray mechanism is located on the inner wall of the outer shell above the water tank. The cooled gas enters the water tank through the water pipe. The gas is in full contact with the liquid in the water tank. Heavier or liquid-soluble materials remain in the water tank. The gas floats upward. The floating gas is sprayed by the spray mechanism to improve the purification effect.

[0012] As a preferred embodiment, the spray mechanism includes a water pump and a nozzle, the water pump is arranged in the water tank, a filter frame is arranged in the water tank, the water pump is arranged inside the filter frame, the nozzle is located on the inner wall of the shell above the water tank, the output end of the water pump is connected to the nozzle, and a nozzle is arranged below the nozzle. Through the spray mechanism, the gas in the floating process can be more fully contacted with the liquid, thereby improving the purification effect.

[0013] Compared with the prior art, the advantages and positive effects of the present invention are:

[0014] 1. The present invention can achieve a double-tube bidirectional effect by arranging the first through-tube and the second through-tube. Since the output ends of the two first water seal safety devices and the two second water seal safety devices of the two groups are respectively connected to the two ends of the first through-tube and the second through-tube, a part of the gas entering the first through-tube moves to the other end of the first through-tube and then moves to the second water seal safety device of the other group, and a part of the gas directly moves to the second water seal safety device of the same group. The same is true for the second through-tube. Since the two streams of gas move bidirectionally in the first through-tube or the second through-tube, it can effectively avoid the situation in which crystals accumulate and block the pipeline when crystallization is generated at low temperature during the unidirectional movement of the gas. During the bidirectional movement, even if a small amount of crystals are condensed, the gas at the other end can impact the crystals to wash them away, thereby avoiding the continuous generation of crystals in a fixed place, thereby ensuring the safety of the pipe body.

[0015] 2. The protective sleeve provided on the through pipe of the present invention can heat the first through pipe and the second through pipe, and the heating source is the residual heat generated by combustion, which can not only keep the first through pipe and the second through pipe warm, but also improve the utilization rate of the residual heat.

[0016] 3. The fleece-surface Velcro and the thorn-surface Velcro of the present invention facilitate installation of the protective cover on the outside of the first through-tube and the second through-tube, and the heat-insulating layer can reduce heat loss when the temperature in the first through-tube and the second through-tube is increased.

[0017] 4. In the present invention, the gas after combustion in the combustion furnace is passed through a bag filter to remove most of the particulate matter, separate out relatively clean gas, and then pass through a filtering mechanism to filter the gas more finely. The gas released by the combustion furnace has a large amount of heat. The high-temperature gas after layers of filtration enters the high-temperature hose through the hot air pipe, and the first through pipe and the second through pipe are heated, which can effectively avoid the problem of crystallization and blockage of sodium, silicon and other substances in the first through pipe and the second through pipe under low temperature conditions. The temperature of the hot air passing through the high-temperature hose gradually decreases, and then enters the washing mechanism through another hot air pipe, and the gas is washed with water by the washing mechanism to achieve further purification of the gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of the combustible gas recycling device provided by the present invention;

[0019] Figure 2 A schematic diagram of the assembly of the first through pipe, the second through pipe, the first water seal safety device and the second water seal safety device of the combustible gas recycling device provided by the present invention;

[0020] Figure 3 A schematic diagram of a flue gas purification device for a combustible gas recycling device provided by the present invention;

[0021] Figure 4 A schematic diagram of a filter mechanism of a combustible gas recycling device provided by the present invention;

[0022] Figure 5 A schematic diagram of a washing mechanism of a combustible gas recycling device provided by the present invention;

[0023] Figure 6 A schematic diagram of a protective cover for the combustible gas recycling device provided by the present invention.

[0024] Legend:

[0025] 1. Flue gas purification device; 2. Oil-water separator; 3. Combustion furnace; 4. First water seal safety device; 5. Second water seal safety device; 6. First through pipe; 7. Second through pipe; 9. Air inlet pipe; 10. Protective cover; 11. First connecting pipe; 12. Second connecting pipe; 13. Insulation layer; 141. Velcro; 142. Velcro; 15. High-temperature hose; 161. Bag filter; 162. Filter mechanism; 163. Washing mechanism; 164. Hot air pipe; 171. Ceramic filter plate; 172. High-temperature resistant synthetic fiber filter plate; 173. Metal fiber filter plate; 181. Shell; 182. Water tank; 183. Water pipe; 191. Water pump; 192. Nozzle; 193. Filter frame; 194. Nozzle. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-6The present invention provides a technical solution: a combustible gas recycling device, including a flue gas purification device 1, an oil-water separator 2, a combustion furnace 3, a first water seal safety device 4 and a second water seal safety device 5, the oil-water separator 2, the combustion furnace 3, the first water seal safety device 4 and the second water seal safety device 5 are each provided with two groups, the two groups of oil-water separators 2, the combustion furnace 3, the first water seal safety device 4 and the second water seal safety device 5 are connected by a double-tube two-way structure, the double-tube two-way structure includes a first through pipe 6 and a second through pipe 7, both ends of the first through pipe 6 and the second through pipe 7 are connected to the combustion furnace 3 respectively, the connection mode between each group of oil-water separators 2, the combustion furnace 3, the first water seal safety device 4 and the second water seal safety device 5 is the same, the oil-water separator The device 2 is connected with the feeding end of the first water seal safety device 4 through the air inlet pipe 9, the exhaust end of the second water seal safety device 5 is connected with one end of the second through pipe 7, the outlet end of the first water seal safety device 4 is connected with the second water seal safety device 5 and the first through pipe 6 respectively, the output end of the combustion furnace 3 is connected with the flue gas purification device 1, and the outer walls of the first through pipe 6 and the second through pipe 7 are detachably provided with a protective cover 10. In the process of thermal cracking of waste tires, the waste tires are first placed in a pyrolysis reactor for decomposition to generate combustible gas, and the combustible gas enters the oil-water separator 2 to separate the oil and water therein to ensure that the gas entering the combustion equipment is pure. The next step is to send the gas back into the combustion furnace 3 for combustion to achieve the effect of recycling. In this During the combustion process, some harmful gases or flames may be generated. In order to ensure the safety of the combustion process, a water seal safety device needs to be installed at the combustion furnace 3. The water seal safety device can cut off the gas and flame. When an abnormal situation occurs, such as an explosion in the combustion furnace 3, a sudden stop of work or reverse flow of air, the water seal safety device can prevent harmful gases from entering other parts to avoid the expansion of the accident. By setting the first through pipe 6 and the second through pipe 7, a double-tube two-way effect can be achieved. Since the output ends of the two first water seal safety devices 4 and the two second water seal safety devices 5 of the two groups are respectively connected to the two ends of the first through pipe 6 and the second through pipe 7, a part of the gas entering the first through pipe 6 moves to the other end of the first through pipe 6, and then It moves to the second water seal safety device 5 of another group, and a part of the gas moves directly to the second water seal safety device 5 of the same group. The same is true for the second through pipe 7. Since the two streams of gas move in both directions in the first through pipe 6 or the second through pipe 7, it can effectively avoid the accumulation of crystals and blocking the pipeline when crystallization is produced at low temperature during the unidirectional movement of the gas. During the bidirectional movement, even if a small amount of crystals are condensed, the gas at the other end can impact the crystals and wash them away, avoiding the continuous production of crystals in a fixed place, thereby ensuring the safety of the pipe body. The protective sleeve 10 set in the through pipe can heat the first through pipe 6 and the second through pipe 7, and the heating source is the residual heat generated by combustion. On the one hand, it can keep the first through pipe 6 and the second through pipe 7 warm, and on the other hand, it can improve the utilization rate of the residual heat.

[0028] like Figure 1-6 As shown, the output end of the first water seal safety device 4 is connected to the second water seal safety device 5 and the first through pipe 6 through the first connecting pipe 11 and the second connecting pipe 12 respectively. Through the cooperation of the first through pipe 6 and the second through pipe 7, double-tube bidirectional gas transportation can be realized.

[0029] like Figure 1-6 As shown, the protective cover 10 is a strip structure, and a heat-insulating layer 13 is provided on the outside of the protective cover 10. Velcro 141 and thorny Velcro 142 are respectively provided on the front and back edges of both sides of the protective cover 10. The fleece Velcro 141 and the thorny Velcro 142 are adhered to each other. The fleece Velcro 141 and the thorny Velcro 142 can facilitate the installation of the protective cover 10 on the outside of the first through pipe 6 and the second through pipe 7. The heat-insulating layer 13 can reduce the loss of heat when the temperature in the first through pipe 6 and the second through pipe 7 is increased.

[0030] like Figure 1-6 As shown, a high-temperature hose 15 is provided on the inner side of the protective cover 10. The high-temperature hose 15 is laid flat in an S shape inside the protective cover 10. The high-temperature hose 15 does not contact the fleece-surface Velcro 141 and the thorn-surface Velcro 142. By setting the high-temperature hose 15, the high-temperature hose 15 will not be damaged even if the protective cover 10 is changed into any shape during installation or removal. At the same time, the high-temperature hose 15 is made of silicone. The silicone hose can work at a temperature of up to three hundred degrees Celsius and has good flexibility and acid and alkali resistance.

[0031] like Figure 1-6 As shown, the flue gas purification device 1 includes a bag filter 161, a filtering mechanism 162 and a washing mechanism 163. The output end of the combustion furnace 3 is connected to the filtering mechanism 162 through the bag filter 161. The output end of the filtering mechanism 162 and the air inlet end of the washing mechanism 163 are both connected to a hot air pipe 164. The end faces of the two hot air pipes 164 are sealed and connected to the two ends of the high-temperature hose 15. The gas after combustion in the combustion furnace 3 passes through the bag filter 161 to remove most of the particulate matter, separate relatively clean gas, and then passes through the filtering mechanism 162 to clean the gas. For fine filtration, the gas released by the combustion furnace 3 has a large amount of heat. The high-temperature gas after layers of filtration enters the high-temperature hose 15 through the hot air pipe 164, and heats the first through pipe 6 and the second through pipe 7. This can effectively avoid the problem of crystallization and blockage of substances such as sodium and silicon in the first through pipe 6 and the second through pipe 7 under low temperature conditions. The temperature of the hot air passing through the high-temperature hose 15 gradually decreases, and then enters the washing mechanism 163 through another hot air pipe 164, and the gas is washed with water by the washing mechanism 163 to achieve further purification of the gas.

[0032] like Figure 1-6As shown, a ceramic filter plate 171, a high temperature resistant synthetic fiber filter plate 172 and a metal fiber filter plate 173 are provided inside the filter mechanism 162. The ceramic filter plate 171, the high temperature resistant synthetic fiber filter plate 172 and the metal fiber filter plate 173 are arranged in sequence from the air inlet end to the air outlet end. Through the set filter mechanism 162, the exhausted gas can be filtered.

[0033] like Figure 1-6 As shown, the washing mechanism 163 includes a shell 181, a water tank 182 and a spray mechanism. The water tank 182 is arranged at the lower part of the shell 181. A water pipe 183 is arranged in the water tank 182. The upper end of the water pipe 183 extends to the outside of the shell 181, and the lower end of the water pipe 183 extends to the bottom of the water in the water tank 182. The spray mechanism is located on the inner wall of the shell 181 above the water tank 182. The cooled gas enters the water tank 182 through the water pipe 183. The gas is fully in contact with the liquid in the water tank 182. Heavier or liquid-soluble materials remain in the water tank 182. The gas floats upward, and the floating gas is sprayed by the spray mechanism, which can improve the purification effect.

[0034] like Figure 1-6 As shown, the spray mechanism includes a water pump 191 and a nozzle 192. The water pump 191 is arranged in the water tank 182. A filter frame 193 is arranged in the water tank 182. The water pump 191 is arranged inside the filter frame 193. The nozzle 192 is located on the inner wall of the shell 181 above the water tank 182. The output end of the water pump 191 is connected to the nozzle 192. A nozzle 194 is arranged below the nozzle 192. Through the spray mechanism, the gas in the floating process can be more fully contacted with the liquid, thereby improving the purification effect.

[0035] Working principle: During the thermal cracking process of waste tires, the waste tires are first placed in the pyrolysis reactor for decomposition to produce combustible gas. The combustible gas enters the oil-water separator 2 to separate the oil and water therein to ensure that the gas entering the combustion equipment is pure. The next step is to send the gas back to the combustion furnace 3 for combustion to achieve the effect of recycling. In this process, some harmful gases or flames may be generated. In order to ensure the safety of the combustion process, it is necessary to set a water seal safety device at the combustion furnace 3. The water seal safety device can play a role in isolating gas and flame. When an abnormal situation occurs, such as an explosion in the combustion furnace 3, a sudden stoppage of work or air flow reverse flow, the water seal safety device can prevent harmful gases from entering other parts to avoid the expansion of the accident. By setting the first through pipe 6 and the second through pipe 7, a double-tube two-way effect can be achieved. Due to the two groups of two first water seal safety devices 4 and two second water The output end of the sealing safety device 5 is connected to the two ends of the first through pipe 6 and the second through pipe 7 respectively, so that part of the gas entering the first through pipe 6 moves to the other end of the first through pipe 6, and then moves to the second water seal safety device 5 of another group, and part of the gas moves directly to the second water seal safety device 5 of the same group. The same is true for the second through pipe 7. Since the two streams of gas move in both directions in the first through pipe 6 or the second through pipe 7, it can effectively avoid the situation where crystals accumulate and block the pipeline when crystals are generated at low temperature during the unidirectional movement of the gas. During the bidirectional movement, even if a small amount of crystals are condensed, the gas at the other end can impact the crystals and wash them away, avoiding the continuous generation of crystals in a fixed place, thereby ensuring the safety of the pipe body. The protective sleeve 10 set in the through pipe can realize heating of the first through pipe 6 and the second through pipe 7, and the heating source is the residual heat generated by combustion. On the one hand, it can achieve insulation of the first through pipe 6 and the second through pipe 7, and on the other hand, it can improve the utilization rate of the residual heat.

[0036] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A combustible gas recycling device, characterized in that: The invention comprises a flue gas purification device (1), an oil-water separator (2), a combustion furnace (3), a first water seal safety device (4) and a second water seal safety device (5), wherein the oil-water separator (2), the combustion furnace (3), the first water seal safety device (4) and the second water seal safety device (5) are each provided with two groups, and the two groups of the oil-water separator (2), the combustion furnace (3), the first water seal safety device (4) and the second water seal safety device (5) are connected by a double-tube bidirectional structure, and the double-tube bidirectional structure comprises a first through-tube (6) and a second through-tube (7), and the two ends of the first through-tube (6) and the second through-tube (7) are respectively connected to the combustion furnace (3), and each group of the oil-water separator (2), the combustion furnace (3), the first water seal safety device (4) and the second water seal safety device (5) are connected by a double-tube bidirectional structure. The oil-water separator (2), the combustion furnace (3), the first water seal safety device (4) and the second water seal safety device (5) are connected in the same manner. The oil-water separator (2) is connected to the feed end of the first water seal safety device (4) via an air inlet pipe (9). The exhaust end of the second water seal safety device (5) is connected to one end of the second through pipe (7). The outlet end of the first water seal safety device (4) is connected to the second water seal safety device (5) and the first through pipe (6) respectively. The output end of the combustion furnace (3) is connected to the flue gas purification device (1). The outer walls of the first through pipe (6) and the second through pipe (7) are detachably provided with protective covers (10).

2. The combustible gas recycling device according to claim 1, characterized in that: The output end of the first water seal safety device (4) is connected to the second water seal safety device (5) and the first through pipe (6) through a first connecting pipe (11) and a second connecting pipe (12) respectively.

3. The combustible gas recycling device according to claim 1, characterized in that: The protective sleeve (10) is a strip-shaped structure, a heat-insulating layer (13) is provided on the outside of the protective sleeve (10), and a fleece-surface Velcro (141) and a thorn-surface Velcro (142) are respectively provided at the front and back edges of both sides of the protective sleeve (10), and the fleece-surface Velcro (141) and the thorn-surface Velcro (142) are adhered to each other.

4. The combustible gas recycling device according to claim 3 is characterized in that: A high-temperature hose (15) is provided inside the protective sleeve (10). The high-temperature hose (15) is arranged flat in an S-shape inside the protective sleeve (10). The high-temperature hose (15) is in complementary contact with the fleece-surface Velcro (141) and the thorn-surface Velcro (142).

5. The combustible gas recycling device according to claim 4, characterized in that: The flue gas purification device (1) comprises a bag filter (161), a filtering mechanism (162) and a washing mechanism (163); the output end of the combustion furnace (3) is connected to the filtering mechanism (162) via the bag filter (161); the output end of the filtering mechanism (162) and the air inlet end of the washing mechanism (163) are both connected to a hot air pipe (164); the end faces of the two hot air pipes (164) are sealed and connected to the two ends of the high-temperature hose (15).

6. The combustible gas recycling device according to claim 5, characterized in that: The filtering mechanism (162) is provided with a ceramic filter plate (171), a high temperature resistant synthetic fiber filter plate (172) and a metal fiber filter plate (173) inside, and the ceramic filter plate (171), the high temperature resistant synthetic fiber filter plate (172) and the metal fiber filter plate (173) are arranged in sequence from the air inlet end to the air outlet end.

7. The combustible gas recycling device according to claim 5, characterized in that: The washing mechanism (163) comprises an outer shell (181), a water tank (182) and a spray mechanism. The water tank (182) is arranged at the lower part of the inner part of the outer shell (181). A water pipe (183) is arranged in the water tank (182). The upper end of the water pipe (183) extends to the outside of the outer shell (181), and the lower end of the water pipe (183) extends to the bottom of the water in the water tank (182). The spray mechanism is located on the inner wall of the outer shell (181) above the water tank (182).

8. The combustible gas recycling device according to claim 7, characterized in that: The spray mechanism comprises a water pump (191) and a spray pipe (192); the water pump (191) is arranged in the water tank (182); a filter frame (193) is arranged in the water tank (182); the water pump (191) is arranged inside the filter frame (193); the spray pipe (192) is located on the inner wall of the outer shell (181) above the water tank (182); the output end of the water pump (191) is connected to the spray pipe (192); and a spray head (194) is arranged below the spray pipe (192).

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