An electrochemical air purification system for eliminating industrial waste gas and VOC pollution

Abstract

The present invention discloses and provides an electrochemical air purification system for eliminating industrial waste gas and VOC pollution. This system has extremely strong ability to adsorb and concentrate all types of harmful ester substances and toxic benzene substances, and will not be saturated in adsorption. The present invention includes a conveying pipeline and a circulation pipeline. Along the conveying direction on the conveying pipeline, an explosion-proof valve, a first charged ion flow generator, an acid-base neutralization and solid particle removal tower, a second charged ion flow generator, a chemical adsorption tower, a regenerator, a third charged ion flow generator, an ester removal and drying combustion chamber, and a combustion furnace are sequentially arranged. The VOC waste gas with added water mist enters the first charged ion flow generator after passing through the explosion-proof valve. The acid-base neutralization and solid particle removal tower is used to remove solid particles and acidic and alkaline gases. Finally, the gas undergoes ester removal and drying combustion, and the adsorbed water in the ester removal and drying combustion chamber is introduced into the regenerator. The present invention is applied to the technical field of eliminating industrial waste gas and VOC pollution.

Description

Technical Field

[0001] The present invention relates to an air purification system, and particularly to an electrochemical air purification system for eliminating industrial waste gas and VOC pollution. Background Art

[0002] Volatile gases (VOCs) generated during the production processes of industries such as the painting industry, plastic industry, shoemaking industry, and electroplating industry are toxic and harmful gases.

[0003] Currently, the relatively advanced catalytic combustion VOC technology, abbreviated as RTO technology, is characterized by adsorbing VOC gases discharged from factories using activated carbon or zeolites, porous ceramic blocks loaded with catalysts such as manganese salts, ferrous salts, zinc salts, copper salts, etc., so that the VOCs are concentrated on the adsorbent material, and then heating the adsorbent material to release the VOC gases. The concentrated VOCs contain toluene gas, xylene gas, ketones, plasticizing gases, and a large amount of ester substances. These toxic gases are all flammable substances, and after being heated and released, they form carbon dioxide and water through combustion.

[0004] The main defects of RTO technology are the attenuation of the adsorbent material and the rapid decline in adsorption capacity. More importantly, the ester colloidal substances on the surface of the adsorbent material will carbonize and coke after heating, resulting in a decrease in the adsorption function of the adsorbent material, thus requiring the replacement of a new adsorbent, increasing the operating cost. If the temperature is increased, carbonization can be prevented, but it will cause the adsorbent material itself to burn or become ineffective at high temperatures. Moreover, this most advanced RTO technology equipment has a large air resistance and low efficiency. Especially for the paint waste gas in the painting industry, the ester substances in the paint waste gas account for about 20 - 45%, and the carbonization problem is very prominent. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an electrochemical air purification system for eliminating industrial waste gas and VOC pollution. This system has a strong ability to adsorb and concentrate all types of harmful ester substances and toxic benzene substances, and will not adsorb to saturation. It solves the problem of carbonization and coking during the combustion of VOCs, simplifies the system pretreatment link, makes the dry gas link and the particulate removal link more effective and energy-saving, and makes the chemical liquid adsorption of VOC more effective.

[0006] The technical solution adopted by the present invention is as follows: The electrochemical air purification system for eliminating industrial waste gas and VOC pollution includes a conveying pipeline and a circulation pipeline. Along the conveying direction on the conveying pipeline, an explosion-proof valve A, a first charged ion flow generator B, an acid-base neutralization and solid particle removal tower C, a second charged ion flow generator D, a chemical adsorption tower E, a regenerator F, a third charged ion flow generator H, an ester removal and drying combustion chamber R, and a combustion furnace J are sequentially arranged; one end of the circulation pipeline is connected to the regenerator F, the other end of the circulation pipeline is connected to the chemical adsorption tower E, and a cooler G is also arranged on the circulation pipeline. The reusable chemical agent in the regenerator F enters the circulation pipeline, is cooled by the cooler G, and then enters the chemical adsorption tower E; the VOC waste gas with water mist enters the first charged ion flow generator B after passing through the explosion-proof valve A. The acid-base neutralization and solid particle removal tower C is used to remove solid particles and acidic and alkaline gases. The chemical adsorption tower E performs chemical absorption on different waste gases. The absorption liquid in the chemical adsorption tower E enters the regenerator F through the conveying pipeline. The gas in the chemical adsorption tower E enters the third charged ion flow generator H. The absorption liquid is a reusable chemical agent. The regenerator F heats the reusable chemical agent adsorbed with VOC waste gas. The reusable chemical agent with adsorbed VOC waste gas releases concentrated VOC waste gas after being heated. The released concentrated VOC waste gas enters the third charged ion flow generator H; the gas from the third charged ion flow generator H then enters the ester removal and drying combustion chamber R for dehydration and ester removal. The VOC waste gas after drying and ester removal in the ester removal and drying combustion chamber R enters the combustion furnace J for combustion. The water adsorbed in the ester removal and drying combustion chamber R is introduced into the regenerator F. The first charged ion flow generator B, the second charged ion flow generator D, and the third charged ion flow generator H are all fusion-assisted charged ion flow injection type generators.

[0007] Further, the first charged ion flow generator B, the second charged ion flow generator D, and the third charged ion flow generator H are all plasma modules.

[0008] Further, the basic number of the chemical adsorption towers E is three, and they can be applied in series repeatedly.

[0009] Further, the heating temperature in the regenerator F is 40°C - 95°C.

[0010] Further, the heating temperature in the regenerator F is 70°C to 85°C.

[0011] Further, the electrochemical air purification system for eliminating industrial waste gas and VOC pollution further includes a heat exchange furnace K. The hot gas generated in the combustion furnace J is introduced into the heat exchange furnace K for heat energy utilization, and the heat exchange water in the heat exchange furnace K enters the heating pipeline of the regenerator F.

[0012] Preferably, the ester removal and drying combustion chamber R includes two independent chambers R1 and R2. Microporous ceramic tubes 1 are provided in both of the two independent chambers R1 and R2. A grounded metal electrode is provided inside the microporous ceramic tube 1. The lower end of the microporous ceramic tube 1 is connected to an insulating material water guide pipe 2. The water vapor and droplets introduced from the third charged ion flow generator H are collected into the microporous ceramic tube 1 and flow into the insulating material water guide pipe 2. The water led out from the insulating material water guide pipe 2 is introduced into the regenerator F. An electric heating wire 3 is wound around the microporous ceramic tube 1.

[0013] Preferably, the ester removal and drying combustion chamber R includes two independent chambers R1 and R2. A plurality of parallel corrugated metal plates or polar plates capable of heating and burning esters in the air flow direction are provided in the two independent chambers R1 and R2. When high voltage electricity is connected, the charged water vapor, residual particulate matters or ester droplets are absorbed. The lower ends of the parallel plates are connected to an insulating material water guide pipe 2. The water vapor and droplets introduced from the third charged ion flow generator H are adsorbed onto the parallel metal plates or the ester burning plates. The water droplets adsorbed at the lower ends of the parallel plates flow into the insulating material water guide pipe 2. The water led out from the insulating material water guide pipe 2 is introduced into the regenerator F. After the electrodes are alternately switched, the ester burning plates start to burn the esters adsorbed on the plates. The heating conductor is a new material or a heatable stainless steel metal plate. The parallel metal plates are connected to high voltage electrodes for absorbing water vapor and ester substances. When the ester substances accumulate to a certain amount, the high voltage can be alternately switched to low voltage mains electricity to heat and burn the esters adsorbed on the electrode plates, thereby eliminating ester pollution and water vapor interference.

[0014] Further, both the acid-base neutralization and solid particle removal tower C and the chemical adsorption tower E are of the structure of a liquid spray tower. The structure of the liquid spray tower includes a tower body 4, in which several layers of support grids 5 are arranged from top to bottom; a spray head 7 is arranged at the top inside the tower body 4, and several layers of the support grids 5 are all located below the spray head 7. A sealed bin plate 8 is also arranged inside the tower body 4, and the sealed bin plate 8 is located below the lowermost support grid 5. The outer edge of the sealed bin plate 8 is hermetically connected to the inner wall of the tower body 4. The sealed bin plate 8 divides the interior of the tower body 4 into an upper chamber 9 and a lower chamber 10. A drain pipe 11 is arranged in the middle of the sealed bin plate 8. The upper end of the drain pipe 11 communicates with the upper chamber 9, and the lower end of the drain pipe 11 is connected to a three-way joint 12 and is located inside the lower chamber 10. An air inlet 13 is arranged on the wall of the tower body 4. The space between the sealed bin plate 8 and the lowermost support grid 5 communicates with the air inlet 13. An air outlet 14 is arranged at the top of the tower body 4. The air outlet 14 communicates with the inside of the tower body 4 and is located above the spray head 7.

[0015] Further, the structure of the liquid spray tower further includes a liquid level gauge 17, a water pump 18 and a discharge tank 15. The liquid level gauge 17 is located inside the lower chamber 10. The water inlet of the water pump 18 communicates with the bottom of the lower chamber 10. The water outlet of the water pump 18 is connected to the spray head 7. The bottom of the discharge tank 15 communicates with the bottom of the lower chamber 10. The discharge tank 15 is a liquid and solid discharge tank; a gas outlet 16 for evolved gas is also arranged on the tower body 4. The gas outlet 16 for evolved gas communicates with the upper part inside the lower chamber 10. The gas outlet 16 for evolved gas is connected to the third charged ion flow generator H through a pipeline.

[0016] The beneficial effects of the present invention are as follows: It changes the traditional VOCs - solid adsorption - solid adsorbent regeneration - combustion technology into VOCs - liquid adsorption - liquid adsorbent regeneration - combustion technology; due to the design adopted in the present invention, it has extremely strong ability to adsorb and concentrate all types of harmful ester substances and toxic benzene substances, and will not be saturated with adsorption, solving the problem of carbonization and coking during the combustion of VOCs, simplifying the system pretreatment link, making the dry gas link and the particle removal link more effective and more energy-saving, and the chemical liquid adsorption of VOCs more effective. At the same time, it can eliminate industrial waste gas containing other harmful substances in solid and liquid forms in the waste gas. Description of the Drawings

[0017] Figure 1 is the overall system structure schematic diagram of the present invention;

[0018] Figure 2 is the structure schematic diagram of the ester removal and drying combustion chamber R;

[0019] Figure 3It is a schematic diagram of the structure of the liquid spray tower;

[0020] Figure 4 It is another schematic diagram of the structure of the ester-removing and drying combustion chamber R. Specific embodiments

[0021] As Figures 1 to 3 shown, in this embodiment, the electrochemical air purification system for eliminating industrial waste gas and VOC pollution includes a conveying pipeline and a circulation pipeline. Along the conveying direction on the conveying pipeline, an explosion-proof valve A, a first charged ion flow generator B, an acid-base neutralization and solid particle removal tower C, a second charged ion flow generator D, a chemical adsorption tower E, a regenerator F, a third charged ion flow generator H, an ester-removing and drying combustion chamber R, and a combustion furnace J are sequentially arranged; one end of the circulation pipeline is connected to the regenerator F, the other end of the circulation pipeline is connected to the chemical adsorption tower E, and a cooler G is also arranged on the circulation pipeline. The renewable chemical agent in the regenerator F enters the circulation pipeline, is cooled by the cooler G, and then enters the chemical adsorption tower E; the VOC waste gas with added water mist enters the first charged ion flow generator B after passing through the explosion-proof valve A. The acid-base neutralization and solid particle removal tower C is used to remove solid particles and acid-base gases. The chemical adsorption tower E performs chemical absorption on different waste gases. The absorption liquid in the chemical adsorption tower E enters the regenerator F through the conveying pipeline. The gas in the chemical adsorption tower E enters the third charged ion flow generator H. The absorption liquid is a renewable chemical agent. The regenerator F heats the renewable chemical agent adsorbed with VOC waste gas. The renewable chemical agent attached with VOC waste gas releases concentrated VOC waste gas after being heated. The released concentrated VOC waste gas enters the third charged ion flow generator H; the gas from the third charged ion flow generator H then enters the ester-removing and drying combustion chamber R for dehydration and ester removal. The VOC waste gas after drying and ester removal in the ester-removing and drying combustion chamber R enters the combustion furnace J for combustion. The water adsorbed in the ester-removing and drying combustion chamber R is introduced into the regenerator F.

[0022] In this embodiment, the first charged ion flow generator B, the second charged ion flow generator D, and the third charged ion flow generator H are all plasma modules, specifically ultra-high voltage and ultra-high density electrostatic plasma generators. The plasma module is different from the traditional electrostatic dust removal device. In the traditional method, the corresponding electrodes are all conductors, and the electrodes are mostly straight lines or slightly pointed protrusions as dust collection electrodes. The plasma module in the present invention uses a brush-shaped electrode bundle stack block, supported by an insulating material, without the effect of wall dust collection, but generates a large number of charged plasmas, such as O3-, NxOy-, H20-, dust-, VOC molecules-, which flow in the pipeline and enter the liquid at the far end.

[0023] In this embodiment, the number of the chemical adsorption towers E is three.

[0024] In this embodiment, the optimal heating temperature in the regenerator F is 70°C to 85°C.

[0025] In this embodiment, the electrochemical air purification system for eliminating industrial waste gas and VOC pollution further includes a heat exchange furnace K. The hot gas generated in the combustion furnace J is introduced into the heat exchange furnace K for heat energy utilization, and the heat exchange water in the heat exchange furnace K enters the heating pipeline of the regenerator F. Using natural gas to burn porous ceramic heat storage blocks in the heat exchange furnace K is more energy-efficient.

[0026] In this embodiment, the ester removal and drying combustion chamber R includes two independent chambers R1 and R2. Microporous ceramic tubes 1 are arranged in both of the two independent chambers R1 and R2. A grounded metal electrode is arranged inside the microporous ceramic tube 1, and the metal electrode is connected to a high-voltage electrostatic power supply of 45,000 V - 50,000 V for adsorbing ester droplets and water vapor. The lower end of the microporous ceramic tube 1 is connected to an insulating material water pipe 2 to collect the water vapor and droplets introduced from the third charged ion flow generator H into the microporous ceramic tube 1 and flow into the insulating material water pipe 2, and the water led out from the insulating material water pipe 2 is introduced into the regenerator F. The two independent chambers R1 and R2 work alternately without affecting the continuous air purification.

[0027] In this embodiment, an electric heating wire 3 is wound around the microporous ceramic tube 1. After long-term dehydration and drying, solid particles (such as paint color particles, etc.) and ester colloids will be deposited on the surface of the microporous ceramic tube 1, thus affecting the water vapor and water permeability of the microporous ceramic tube 1. An electric heating wire is wound around the microporous ceramic tube 1, and the electric heating wire is energized and heated at intervals to burn off the ester colloids. The heating temperature of the electric heating wire is about 900°C - 1000°C, preferably 850 ± 5°C, and it is completely burned into CO2 and water without carbonization.

[0028] In this embodiment, as Figure 4The two independent chambers R1 and R2 can also be internally provided with multiple parallel corrugated metal plates in the air flow direction or polar plates that can heat and burn esters. When high voltage electricity is connected, they absorb the already charged water vapor, residual particulate matter or ester droplets. The lower ends of the parallel plates are connected to an insulating material water pipe 2, which adsorbs the water vapor and droplets introduced from the third charged ion flow generator H onto the parallel metal plates or the ester-burning plates. The water droplets adsorbed at the lower ends of the parallel plates flow into the insulating material water pipe 2, and the water led out from the insulating material water pipe 2 is introduced into the regenerator F. After alternating the conversion of electrodes, the ester-burning plates start to burn the esters adsorbed on the plates. The heating conductor is a new material or a heatable stainless steel metal plate. The parallel metal plates are connected to high voltage electrodes for absorbing water vapor and ester substances. When a certain amount of ester substances accumulates, the electrodes can be alternately converted to low voltage mains electricity to heat and burn the esters adsorbed on the electrode plates, thereby eliminating ester pollution and water vapor interference. Openings 20 are provided on the chambers R1 and R2, and the openings 20 communicate with the bottom pipelines of the box body to introduce the alternating collected substances of R1 and R2 into F for regeneration and combustion.

[0029] In this embodiment, both the acid-base neutralization and solid particle removal tower C and the chemical adsorption tower E are of a liquid spray tower structure. The liquid spray tower structure includes a tower body 4, in which several layers of support grids 5 are arranged from top to bottom. Spheres 6 are arranged on each layer of the support grids 5, and the spheres 6 can increase the contact area. A spray head 7 is arranged at the top inside the tower body 4, and several layers of the support grids 5 are all located below the spray head 7. The liquid sprayed by the spray head 7 can be selected from water, acid, alkali and other different surfactant liquids. A sealed bin plate 8 is also arranged inside the tower body 4, and the sealed bin plate 8 is located below the lowermost layer of the support grids 5. The outer edge of the sealed bin plate 8 is hermetically connected to the inner wall of the tower body 4. The sealed bin plate 8 divides the interior of the tower body 4 into an upper chamber 9 and a lower chamber 10. A drain pipe 11 is arranged in the middle of the sealed bin plate 8. The drain pipe 11 is a thin drain pipe. The upper end of the drain pipe 11 communicates with the upper chamber 9, and the lower end of the drain pipe 11 is connected to a three-way joint 12 and is located inside the lower chamber 10. An air inlet 13 is provided on the wall of the tower body 4, and the space between the sealed bin plate 8 and the lowermost layer of the support grids 5 communicates with the air inlet 13. An air outlet 14 is provided at the top of the tower body 4, and the air outlet 14 communicates with the inside of the tower body 4 and is located above the spray head 7.

[0030] In this embodiment, the liquid spray tower structure further includes a liquid level gauge 17, a water pump 18 and a discharge tank 15. The liquid level gauge 17 is located in the lower chamber 10. The water inlet of the water pump 18 is communicated with the bottom of the lower chamber 10, and the water outlet of the water pump 18 is connected to the spray head 7. The bottom of the discharge tank 15 is communicated with the bottom of the lower chamber 10. An evolved gas outlet 16 is further provided on the tower body 4. The evolved gas outlet 16 is communicated with the upper part in the lower chamber 10, and the evolved gas outlet 16 is connected to the third charged ion flow generator H through a pipeline. The gas evolved from the liquid in the lower chamber 10 is introduced into the third charged ion flow generator H. The gas of the third charged ion flow generator H then enters the de-esterification and drying combustion chamber R for dehydration and de-esterification. The waste gas after drying and de-esterification in the de-esterification and drying combustion chamber R enters the combustion furnace J for combustion.

[0031] Although the embodiments of the present invention are described with actual solutions, they do not constitute a limitation to the meaning of the present invention. For those skilled in the art, it is obvious to modify its implementation solutions according to this specification and combine them with other solutions.

Claims

1. An electrochemical air purification system for eliminating industrial waste gas and VOC pollution, characterized in that: The described electrochemical air purification system for eliminating industrial waste gas and VOC pollution includes a conveying pipeline and a circulation pipeline. Along the conveying direction on the conveying pipeline, an explosion-proof valve (A), a first charged ion flow generator (B), an acid-base neutralization and solid particle removal tower (C), a second charged ion flow generator (D), a chemical adsorption tower (E), a regenerator (F), a third charged ion flow generator (H), an ester removal and drying combustion chamber (R), and a combustion furnace (J) are sequentially arranged; one end of the circulation pipeline is connected to the regenerator (F), the other end of the circulation pipeline is connected to the chemical adsorption tower (E), a cooler (G) is also arranged on the circulation pipeline, and the renewable chemical agent in the regenerator (F) enters the circulation pipeline, is cooled by the cooler (G) and then enters the chemical adsorption tower (E); the VOC waste gas with added water mist enters the first charged ion flow generator (B) after passing through the explosion-proof valve (A), the acid-base neutralization and solid particle removal tower (C) is used to remove solid particles and acid-base gases, the chemical adsorption tower (E) conducts chemical absorption for different waste gases, the absorption liquid in the chemical adsorption tower (E) enters the regenerator (F) through the conveying pipeline, the gas in the chemical adsorption tower (E) enters the third charged ion flow generator (H), the absorption liquid is a renewable chemical agent, the regenerator (F) heats the renewable chemical agent adsorbed with VOC waste gas, and the adsorbed renewable chemical agent releases concentrated VOC waste gas when heated, and the released concentrated VOC waste gas enters the third charged ion flow generator (H); the gas from the third charged ion flow generator (H) then enters the ester removal and drying combustion chamber (R) for dehydration and ester removal, and the VOC waste gas after drying and ester removal in the ester removal and drying combustion chamber (R) enters the combustion furnace (J) for combustion, and the water adsorbed in the ester removal and drying combustion chamber (R) is introduced into the regenerator (F); the first charged ion flow generator (B), the second charged ion flow generator (D), and the third charged ion flow generator (H) are all plasma modules; the basic number of the chemical adsorption towers (E) is three and they are applied in series repeatedly.

2. The electrochemical air purification system for eliminating industrial waste gas and VOC pollution according to claim 1, characterized in that: The heating temperature in the regenerator (F) is 40°C - 95°C.

3. The electrochemical air purification system for eliminating industrial waste gas and VOC pollution according to claim 2, wherein: The heating temperature in the regenerator (F) is 70°C to 85°C.

4. An electrochemical air purification system for eliminating industrial waste gas and VOC pollution according to claim 1, characterized in that: The described electrochemical air purification system for eliminating industrial waste gas and VOC pollution further includes a heat exchange furnace (K), the hot gas generated in the combustion furnace (J) is introduced into the heat exchange furnace (K) for heat energy utilization, and the heat exchange water in the heat exchange furnace (K) enters the heating pipeline of the regenerator (F).

5. An electrochemical air purification system for eliminating industrial waste gas and VOC pollution according to claim 1, characterized in that: The de-esterification drying combustion chamber (R) includes two independent chambers (R1, R2). Microporous ceramic tubes (1) are arranged in both of the two independent chambers (R1, R2). A grounded metal electrode is disposed inside the microporous ceramic tube (1). The lower end of the microporous ceramic tube (1) is connected to an insulating material water pipe (2). Water vapor and droplets introduced from the third charged ion flow generator (H) are collected into the microporous ceramic tube (1) and flow into the insulating material water pipe (2). The water led out from the insulating material water pipe (2) is introduced into the regenerator (F). An electric heating wire (3) is wound around the microporous ceramic tube (1).

6. The electrochemical air purification system for eliminating industrial waste gas and VOC pollution according to claim 5, wherein: The de-esterification drying combustion chamber (R) includes two independent chambers (R1, R2). A plurality of parallel wavy metal plates or polar plates capable of heating and burning esters in the air flow direction are arranged in the two independent chambers (R1, R2). When high voltage is connected, the charged water vapor, residual particulate matters or ester droplets are absorbed. The lower end of the parallel plate is connected to an insulating material water pipe (2). Water vapor and droplets introduced from the third charged ion flow generator (H) are adsorbed onto the parallel metal plate or the ester-burning plate (1). The water droplets adsorbed at the lower end of the parallel plate flow into the insulating material water pipe (2). The water led out from the insulating material water pipe (2) is introduced into the regenerator (F). After the electrodes are alternately switched, the ester-burning plate starts to burn the esters adsorbed on the plate. The heating conductor is a heatable stainless steel metal plate.

7. An electrochemical air purification system for eliminating industrial waste gas and VOC pollution according to claim 1, characterized in that: Both the acid-base neutralization and solid particle removal tower (C) and the chemical adsorption tower (E) are of the structure of a liquid spray tower. The liquid spray tower structure includes a tower body (4). A plurality of layers of support grids (5) are arranged in the tower body (4) from top to bottom. Spheres (6) are arranged on each layer of the support grid (5). A spray head (7) is arranged at the top of the tower body (4). A plurality of layers of the support grids (5) are all located below the spray head (7). A sealed bin plate (8) is further arranged in the tower body (4). The sealed bin plate (8) is located below the lowermost support grid (5). The outer edge of the sealed bin plate (8) is hermetically connected to the inner wall of the tower body (4). The sealed bin plate (8) divides the interior of the tower body (4) into an upper chamber (9) and a lower chamber (10). A drain pipe (11) is arranged in the middle of the sealed bin plate (8). The upper end of the drain pipe (11) communicates with the upper chamber (9). The lower end of the drain pipe (11) is connected to a three-way joint (12) and is located in the lower chamber (10). An air inlet (13) is arranged on the wall of the tower body (4). The space between the sealed bin plate (8) and the lowermost support grid (5) communicates with the air inlet (13). An air outlet (14) is arranged at the top of the tower body (4). The air outlet (14) communicates with the interior of the tower body (4) and is located above the spray head (7).

8. An electrochemical air purification system for eliminating industrial waste gas and VOC pollution according to claim 7, characterized in that: The structure of the liquid spray tower further includes a liquid level gauge (17), a water pump (18) and a discharge tank (15). The liquid level gauge (17) is located in the lower chamber (10). The water inlet of the water pump (18) is communicated with the bottom of the lower chamber (10). The water outlet of the water pump (18) is connected to the spray head (7). The bottom of the discharge tank (15) is communicated with the bottom of the lower chamber (10). An outlet for the precipitated gas (16) is further provided on the tower body (4). The outlet for the precipitated gas (16) is communicated with the upper part in the lower chamber (10). The outlet for the precipitated gas (16) is communicated with the third charged ion flow generator (H) through a pipeline.

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