Multi-stage waste gas treatment system

Abstract

The utility model relates to a multistage waste gas treatment system, including treatment chamber, water mist spraying device, bio-trickling filtration device and photolysis device, wherein the treatment chamber is provided with a first gas inlet for the gas to be treated to be discharged, bio-trickling filtration device includes filter chamber, the bottom of filter chamber is provided with a second gas inlet for the gas flowing through the spraying area to enter, and the second gas inlet is provided with a second gas outlet for the gas flowing through the spraying area to enter. The top of the filtering cavity is connected with an exhaust air pipe for exhausting air, a filtering filler is arranged in the middle of the filtering cavity, and a dripping pipe is arranged above the filtering filler; the photolysis device comprises a treatment cavity and a photolysis lamp tube arranged in the treatment cavity, one side of the treatment cavity is connected with the exhaust air pipe, and the other side of the treatment cavity is communicated with the external environment. Compared with the prior art, air particles in waste gas can be removed in the first-stage waste gas treatment, and the whole system has the advantage of being high in working efficiency along with subsequent second-stage and third-stage treatment devices.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment, in particular to a multi-stage waste gas treatment system. Background Art

[0002] With the rapid development of large-scale farming, the environment caused by exhaust gas in livestock houses is an urgent problem that needs to be solved. The combination of fully enclosed livestock houses and longitudinal mechanical ventilation mode is currently a widely used model in modern large-scale farming. Under this model, the stocking density is high and the ventilation volume is large. The exhaust gas in the livestock house contains a large amount of harmful gases such as ammonia and odor, as well as air particles and microorganisms. Relevant studies have shown that if it is allowed to be discharged, it will not only seriously threaten the health of livestock house workers and livestock, but also cause pollution to the surrounding atmospheric environment and threaten the surrounding biological safety. The current livestock house exhaust gas treatment system does not consider the removal of air particles in the process of exhaust gas removal. Long-term accumulation will cause damage to the treatment system and reduce work efficiency. Therefore, it is urgent to develop a multi-stage exhaust gas treatment system to improve the existing livestock house exhaust gas treatment device. Summary of the invention

[0003] In view of the above problems, the utility model provides a multi-stage exhaust gas treatment system, which can remove air particles in the exhaust gas and has the advantage of high working efficiency.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A multi-stage exhaust gas treatment system, comprising:

[0006] A processing chamber, wherein the processing chamber is provided with a first gas inlet for exhausting the gas to be processed;

[0007] A water mist spraying device, wherein the water mist spraying device has a spraying area, and the first air inlet faces the spraying area;

[0008] A biological trickling filter device, the biological trickling filter device comprising a filter chamber, a second air inlet for gas flowing through the spraying area is provided at the bottom of the filter chamber, an exhaust air duct is connected to the top of the filter chamber for air extraction, a filter filler is provided in the middle of the filter chamber, and a drip tube is provided above the filter filler; and

[0009] The photolysis device comprises a processing chamber and a photolysis lamp arranged in the processing chamber. One side of the processing chamber is connected to the exhaust air duct, and the other side is connected to the external environment.

[0010] In one embodiment, a first liquid storage tank is disposed below the spraying area.

[0011] In one embodiment, the bottom of the filter cavity is open to form the second air inlet, and a second liquid storage tank is provided below the filter cavity.

[0012] In one embodiment, the photolysis device further comprises a buffer plate, which is arranged inside the processing chamber and located on one side of the photolysis lamp tube, and the buffer plate is provided with a plurality of air holes for gas circulation.

[0013] In one embodiment, the photolysis device further comprises a titanium dioxide catalytic plate, and the titanium dioxide catalytic plate is disposed in the processing chamber.

[0014] In one embodiment, the second liquid storage tank is connected to a liquid inlet pipe, and the liquid inlet pipe is connected to the dripping pipe through a water pump.

[0015] In one embodiment, the second liquid storage tank is provided with a water inlet and a water outlet.

[0016] In one embodiment, the photolysis lamp comprises an ultraviolet lamp.

[0017] The utility model adopts the above technical solution, which has the following advantages:

[0018] When the system is treating waste gas, the water mist spraying device is started to continuously generate water mist in the spraying area. At the same time, the biological trickling filter device is started to connect the mineral nutrient solution to the dripping pipe and continuously supply it. The mineral nutrient solution will continue to drip from the dripping pipe and penetrate into the filter filler below. The setting of the filter filler can make the waste gas fully contact and react with it, thereby improving the overall treatment efficiency.

[0019] During actual treatment, the waste gas enters the treatment chamber through the first air inlet. Since the first air inlet faces the spraying area of ​​the water mist spraying device, the water mist in the spraying area will remove some odor components and air particles that are easily soluble in water in the waste gas, completing the first stage of waste gas treatment in the system.

[0020] With the continuous exhaust of the exhaust duct, the gas after flowing through the spraying area enters the filter chamber of the biological trickling filter device through the second air inlet under the guidance of the airflow. The waste gas will penetrate into the filter filler under the negative pressure generated by the exhaust duct. At this time, the mineral nutrient solution that continuously drips into the filter filler will treat the incoming waste gas and degrade harmful substances, completing the second-level waste gas treatment in the system.

[0021] The gas that has completed the second stage of treatment enters the processing chamber of the photolysis device under the action of the exhaust air duct. The photolysis lamp will continue to purify the gas in the processing chamber, and finally complete the treatment of the exhaust gas. The treated gas can be discharged directly. Among them, in the first stage of exhaust gas treatment, the air particulate matter in the exhaust gas can be removed, and the overall system has the advantage of high working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the specific principles of a multi-stage exhaust gas treatment system in one embodiment of the utility model;

[0023] Figure 2 This is a schematic diagram of the specific principle of the biological trickling filter device in one embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the specific principle of the photolysis device in one embodiment of the utility model;

[0025] The marks in the figure are as follows:

[0026] 1. Processing chamber; 11. First air inlet;

[0027] 2. Water mist spraying device; 21. Spraying area; 22. First liquid storage tank; 23. Cantilever pipe; 24. Spray head;

[0028] 3. Bio-trickling filter device; 31. Filter chamber; 32. Second air inlet; 33. Exhaust duct; 34. Filter filler; 35. Drip tube; 36. Second liquid storage tank; 37. Liquid inlet pipe; 38. Water inlet; 39. Water outlet;

[0029] 4. Photolysis device; 41. Processing chamber; 42. Photolysis lamp; 43. Buffer plate; 44. Titanium dioxide catalyst plate. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary persons in the field without creative work are within the scope of protection of the utility model.

[0031] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second", "third", "fourth" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0032] At present, the waste gas treatment system of livestock houses does not consider the removal of air particles in the process of removing waste gas. Long-term accumulation will cause damage to the treatment system and reduce work efficiency. In view of the above problems, the utility model provides a multi-stage waste gas treatment system that can remove air particles in waste gas and has the advantage of high work efficiency. The specific scheme is as follows.

[0033] Reference Figure 1 , Figure 2 as well as Figure 3 As shown, the utility model relates to a multi-stage waste gas treatment system, comprising a treatment chamber 1, a water mist spraying device 2, a biotrickling filter device 3 and a photolysis device 4, wherein the treatment chamber 1 is provided with a first air inlet 11 for the gas to be treated to be discharged, the water mist spraying device 2 has a spraying area 21, and the first air inlet 11 faces the spraying area 21.

[0034] The biological trickling filter device 3 includes a filter chamber 31, a second air inlet 32 ​​is provided at the bottom of the filter chamber 31 for the gas flowing through the spraying area 21 to enter, an exhaust air duct 33 is connected to the top of the filter chamber 31 for exhausting air, a filter filler 34 is provided in the middle of the filter chamber 31, and a drip tube 35 is provided above the filter filler 34.

[0035] The photolysis device 4 includes a processing chamber 41 and a photolysis lamp 42 disposed in the processing chamber 41. One side of the processing chamber 41 is connected to the exhaust air duct 33, and the other side is connected to the external environment.

[0036] For example, when the system is treating waste gas, the water mist spraying device 2 is started to continuously generate water mist in the spraying area 21, and the biological trickling filter device 3 is started to connect the mineral nutrient solution to the dripping pipe 35 and continuously supply it. The mineral nutrient solution will continue to drip from the dripping pipe 35 and penetrate into the filter filler 34 below. The setting of the filter filler 34 can make the waste gas fully contact and react with it, thereby improving the overall treatment efficiency;

[0037] During actual treatment, the waste gas enters the treatment chamber 1 through the first air inlet 11. Since the first air inlet 11 faces the spraying area 21 of the water mist spraying device 2, the water mist in the spraying area 21 will remove some odor components and air particles that are easily soluble in water in the waste gas, completing the first stage of waste gas treatment in the system.

[0038] As the exhaust duct 33 continues to pump air, the gas after flowing through the spraying area 21 enters the filter chamber 31 of the biological trickling filter 3 through the second air inlet 32 ​​under the guidance of the air flow. The exhaust gas will penetrate into the filter filler 34 under the negative pressure generated by the exhaust duct 33. At this time, the mineral nutrient solution that continuously drips into the filter filler 34 will treat the incoming exhaust gas and degrade harmful substances, completing the second-level exhaust gas treatment in the system.

[0039] The gas that has completed the second stage of treatment enters the processing chamber 41 of the photolysis device 4 under the action of the exhaust duct 33. The photolysis lamp tube 42 will continue to purify the gas in the processing chamber 41, and finally complete the treatment of the exhaust gas. The treated gas can be discharged directly. Among them, in the first stage of exhaust gas treatment, the air particulate matter in the exhaust gas can be removed, and the overall system has the advantage of high working efficiency.

[0040] In order to collect the liquid generated in the spraying area 21 , a first liquid storage tank 22 is provided below the spraying area 21 .

[0041] In one embodiment, the overall structure of the biological trickling filter device 3 is further refined, the bottom of the filter chamber 31 is open to form a second air inlet 32, and a second liquid reservoir 36 is provided below the filter chamber 31. The second liquid reservoir 36 can be provided to recover the mineral nutrient solution dripping from the filter filler 34.

[0042] In this embodiment, specifically, the second liquid storage tank 36 is connected to a liquid inlet pipe 37, and the liquid inlet pipe 37 is connected to the dripping pipe 35 through a water pump. Meanwhile, in this embodiment, a water inlet 38 and a water outlet 39 are provided on the second liquid storage tank 36.

[0043] The liquid inlet pipe 37 enables the mineral nutrient solution to circulate, while the water inlet 38 and the water outlet 39 are provided to facilitate the addition of the mineral nutrient solution and the discharge of the liquid in the second liquid storage tank 36 .

[0044] In one embodiment, specifically, the photolysis device 4 further includes a buffer plate 43, which is disposed inside the processing chamber 41 and located on one side of the photolysis lamp tube 42. The buffer plate 43 is provided with a plurality of air holes for gas circulation.

[0045] It should be noted that the gas that has completed the second stage of treatment enters the processing chamber 41 of the photolysis device 4 under the action of the exhaust duct 33. At the moment the gas enters, the flow rate of the gas is relatively fast, and the setting of the buffer plate 43 can appropriately reduce the flow rate of the gas and play a buffering role, so that the gas can fully react with the light emitted by the photolysis lamp 42, thereby improving the processing efficiency of the photolysis device 4.

[0046] In one embodiment, the buffer plate 43 is made of a light-transmitting material. The photolysis device 4 further includes a titanium dioxide catalytic plate 44 . The titanium dioxide catalytic plate 44 is disposed in the processing chamber 41 .

[0047] Titanium dioxide photocatalytic technology mainly uses the active oxygen species generated by titanium dioxide under ultraviolet light to decompose organic and inorganic matter, thereby achieving the purpose of purifying air and water. The principles of titanium dioxide photocatalysis mainly include three aspects: photogenerated electron-hole pairs, the generation of active oxygen species, and the degradation of organic matter. First, when titanium dioxide is exposed to ultraviolet light, the electrons in its valence band are excited to the conduction band to form photogenerated electron-hole pairs. These electrons and holes have high mobility and can diffuse quickly on the surface of titanium dioxide. The oxygen molecules adsorbed on the surface combine with photogenerated electrons to form active oxygen species, while the holes combine with water molecules to generate hydroxyl radicals. These active oxygen species and hydroxyl radicals have strong oxidizing ability and can oxidize nearby organic molecules. Secondly, the generation of active oxygen species is a key step in the titanium dioxide photocatalytic process. Active oxygen species mainly include superoxide anions, hydroxyl radicals, and hydrogen peroxide. These active oxygen species have strong oxidizing ability and can oxidize nearby organic molecules and decompose them into small molecules or harmless substances.

[0048] Finally, titanium dioxide photocatalysis can degrade organic matter into carbon dioxide and water through the action of active oxygen species. This process of photocatalytic degradation of organic matter is a self-purification process that can efficiently purify organic pollutants in the environment to further optimize the overall treatment efficiency of the system.

[0049] The utility model also provides a specific implementation mode, in which the system as a whole is applied to the waste gas treatment of the livestock house, the treatment chamber 1 is arranged at the tail end of the livestock house, and a fan is arranged at the first air inlet 11, and the treatment chamber 1 is connected to the tail end of the livestock house through the first air inlet 11. During actual operation, the fan works continuously to draw the waste gas in the livestock house into the treatment chamber 1 for treatment.

[0050] When the system is treating waste gas, the water mist spraying device 2 is started to continuously generate water mist in the spraying area 21, and the biological trickling filter device 3 is started at the same time, and the mineral nutrient solution is connected to the dripping pipe 35 and continuously supplied. The mineral nutrient solution will continue to drip from the dripping pipe 35 and penetrate into the filter filler 34 below.

[0051] The water mist spraying device 2 specifically includes a cantilever pipe 23, on which a plurality of nozzles 24 are connected at intervals, and a spraying area 21 is formed below the nozzles 24. During operation, the nozzles 24 continuously generate water mist, and the first liquid storage tank 22 at the bottom collects the liquid. In order to circulate the liquid, a water pump is provided on the first liquid storage tank 22, and the water pump is connected to the cantilever pipe 23 to form a circulation.

[0052] The waste gas enters the spraying area 21 through the first air inlet 11. The water mist in the spraying area 21 will remove some odor components and air particles in the waste gas that are easily soluble in water, completing the first stage of waste gas treatment in the system.

[0053] After the first stage of waste gas treatment, a large amount of dust has been removed, but the waste gas still contains substances such as hydrogen sulfide and ammonia. The mineral nutrient solution mainly selects suitable bacteria based on the components in the waste gas to eliminate harmful substances.

[0054] Specifically, in this embodiment, the mineral nutrient solution is specifically heterotrophic nitrifying aerobic denitrifying bacteria and ferrothiobacillus. Heterotrophic nitrifying aerobic denitrifying bacteria will react with ammonia nitrogen compounds in the exhaust gas to achieve the degradation of ammonia nitrogen compounds; the action principle of ferrothiobacillus is that hydrogen sulfide is absorbed by the ferric sulfate solution and converted into ferrous sulfate and elemental sulfur, and ferrous sulfate can be oxidized by ferrothiobacillus. In order to enable the biological bacteria to continuously absorb odor, special substances need to be added to the biological trickling filter to cultivate the biological bacteria. The main added substances are ammonium sulfate, potassium nitrate, sodium citrate, magnesium sulfate heptahydrate, dipotassium hydrogen phosphate, sodium chloride, manganese sulfate tetrahydrate, ferrous sulfate and deionized water.

[0055] With the continuous extraction of air from the exhaust duct 33, the gas that has undergone the first-stage exhaust gas treatment enters the filter chamber 31 of the biological trickling filter 3 through the second air inlet 32 ​​under the guidance of the airflow, and the exhaust gas will penetrate into the filter filler 34 under the action of the negative pressure generated by the exhaust duct 33. At this time, the mineral nutrient solution that continuously drips into the filter filler 34 will treat the incoming exhaust gas and degrade harmful substances, completing the second-stage exhaust gas treatment in the system.

[0056] The gas that has completed the second stage of treatment enters the processing chamber 41 of the photolysis device 4 under the action of the exhaust duct 33. Specifically, in this embodiment, the photolysis lamp tube 42 is specifically an ultraviolet lamp tube. The photolysis lamp tube 42 will continue to purify the gas in the processing chamber 41, and finally complete the treatment of the exhaust gas. The treated gas can be directly discharged.

[0057] During the treatment process, the buffer plate 43 can appropriately reduce the flow rate of the gas and play a buffering role, so that the gas can fully react with the light emitted by the photolysis lamp 42. At the same time, the titanium dioxide catalytic plate 44 catalytically reacts with the exhaust gas under the action of the ultraviolet light source, amplifying the light source effect by 10-30 times, allowing it to fully react with the exhaust gas, thereby improving the exhaust gas purification efficiency.

[0058] After completing the third-level treatment, the gas can be discharged normally.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A multi-stage exhaust gas treatment system, characterized in that: include: A processing chamber, wherein the processing chamber is provided with a first gas inlet for exhausting the gas to be processed; A water mist spraying device, wherein the water mist spraying device has a spraying area, and the first air inlet faces the spraying area; A biological trickling filter device, the biological trickling filter device comprising a filter chamber, a second air inlet for gas flowing through the spraying area is provided at the bottom of the filter chamber, an exhaust air duct is connected to the top of the filter chamber for air extraction, a filter filler is provided in the middle of the filter chamber, and a drip tube is provided above the filter filler; and The photolysis device comprises a processing chamber and a photolysis lamp arranged in the processing chamber. One side of the processing chamber is connected to the exhaust air duct, and the other side is connected to the external environment.

2. The multi-stage exhaust gas treatment system according to claim 1, characterized in that: A first liquid storage tank is arranged below the spraying area.

3. The multi-stage exhaust gas treatment system according to claim 1, characterized in that: The bottom of the filter cavity is open to form the second air inlet, and a second liquid storage tank is arranged below the filter cavity.

4. The multi-stage exhaust gas treatment system according to claim 1, characterized in that: The photolysis device further comprises a buffer plate, which is arranged inside the processing chamber and located on one side of the photolysis lamp tube. The buffer plate is provided with a plurality of air holes for gas circulation.

5. The multi-stage exhaust gas treatment system according to claim 1, characterized in that: The photolysis device also includes a titanium dioxide catalytic plate, which is arranged in the processing chamber.

6. The multi-stage exhaust gas treatment system according to claim 3, characterized in that: The second liquid storage tank is connected with a liquid inlet pipe, and the liquid inlet pipe is connected with the dripping pipe through a water pump.

7. The multi-stage exhaust gas treatment system according to claim 3, characterized in that: The second liquid storage tank is provided with a water inlet and a water outlet.

8. The multi-stage exhaust gas treatment system according to claim 1, characterized in that: The photolysis lamp tube comprises an ultraviolet lamp tube.

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