A solid waste screening exhaust gas treatment system

Abstract

This utility model provides a solid waste screening exhaust gas treatment system, including an oxidation absorption tower, an alkali absorption tower, a photocatalytic oxidation device, an activated carbon adsorption device, a circulating water pump, an induced draft fan, and an exhaust stack. The outlet of the oxidation absorption tower is fixedly connected to the inlet of the alkali absorption tower via a duct. The outlet of the alkali absorption tower is fixedly connected to the second inlet of the photocatalytic oxidation device via a duct. The second outlet of the photocatalytic oxidation device is fixedly connected to the third inlet of the activated carbon adsorption device via a duct. The third outlet of the activated carbon adsorption device is fixedly connected to the exhaust stack via the induced draft fan. This utility model not only removes odors while reducing the use of treatment liquid, but also purifies the gas reacting with the reagents in the purification tower and prevents secondary pollution caused by the reagents.

Description

Technical Field

[0001] This utility model belongs to the field of waste gas treatment, and in particular relates to a solid waste screening waste gas treatment system. Background Technology

[0002] After collection, solid waste undergoes screening, which generates malodorous exhaust gases. These gases primarily consist of ammonia (NH3, hydrogen sulfide H2S), mercaptans, and volatile organic compounds (such as methane and ethylene). They may also contain sulfur compounds and aldehydes (such as formaldehyde and acetaldehyde). Currently, plant-based liquid spraying is commonly used for treatment, but this method is ineffective, has high operating costs, and significantly impacts the workshop and surrounding environment. Therefore, based on the composition of the exhaust gases generated by this industry, a targeted exhaust gas treatment process needs to be designed. Existing exhaust gas purification devices, due to their unreasonable structural design, cannot adequately meet the requirements, and the incompletely treated gases cause significant environmental pollution. Therefore, developing new, easy-to-operate, and low-investment exhaust gas treatment systems is essential.

[0003] Currently, most odorous waste gases from solid waste screening are treated by spraying with a single plant-based liquid before emission. However, the existing single process cannot completely remove the odor, and the consumption of plant-based liquid is enormous. Secondly, the solution that reacts with the reagent in the purification tower is directly discharged through the exhaust stack, and the insufficiently treated reagent can easily cause secondary pollution.

[0004] Therefore, it is essential to invent a solid waste screening exhaust gas treatment system. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a solid waste screening exhaust gas treatment system. The technical solution adopted is as follows: A solid waste screening exhaust gas treatment system includes an oxidation absorption tower, an alkali absorption tower, a photocatalytic oxidation device, an activated carbon adsorption device, a circulating water pump, an induced draft fan, and an exhaust stack. The exhaust port of the oxidation absorption tower is fixedly connected to the inlet of the alkali absorption tower via a duct. The exhaust port of the alkali absorption tower is fixedly connected to the second inlet of the photocatalytic oxidation device via a duct. The second exhaust port of the photocatalytic oxidation device is fixedly connected to the third inlet of the activated carbon adsorption device via a duct. The third exhaust port of the activated carbon adsorption device is fixedly connected to the exhaust stack via an induced draft fan.

[0006] The oxidation absorption tower and the alkali absorption tower have the same structure. The alkali absorption tower includes a shell, a wire mesh demister, a packing demister, a spray system, a packing layer, an overflow port, and a drain port. The shell is provided with at least one manhole sight glass. Inside the shell, the wire mesh demister, the packing demister, the spray system, and the packing layer are fixedly installed from top to bottom through a packing support plate. There are two sets of the spray system and the packing layer. The overflow port and the drain port are fixedly installed on the lower side of the shell. The overflow port is above the drain port. A replenishment component is provided on the lower outer side of the shell.

[0007] The replenishment assembly includes a level gauge, a pH port, a water inlet, a chemical dosing port, and a circulating water tank. The circulating water tank is fixedly installed on the outside of the lower part of the housing and is connected to the bottom of the housing. The circulating water tank is provided with a chemical dosing port and a pH port, and the level gauge is installed on the lower part of the housing.

[0008] The circulating water tank is detachably fitted with a cover, and a PP filter screen is fixedly installed inside the circulating water tank.

[0009] The photocatalytic oxidation device includes a housing, a filter, ultraviolet lamps, titanium dioxide photocatalyst, a drain outlet, and a bottom oil drain trough. A filter is fixedly installed inside the housing near the air inlet. Several sets of ultraviolet lamps and titanium dioxide photocatalysts are arranged alternately inside the housing. The lamp rectifier and control circuit module of the ultraviolet lamps are fixedly installed outside the housing. A drain outlet and a bottom oil drain trough are provided at the bottom of the housing.

[0010] The activated carbon adsorption device includes a housing three, an activated carbon filling port, a temperature sensor interface, a drain three, an activated carbon discharge port, support columns, a spray port, a spiral nozzle, an activated carbon filling area, a gas guide plate, and an activated carbon support perforated plate. The activated carbon filling port is provided on the top of the housing three, and the drain three and activated carbon discharge ports are provided on the bottom of the housing three. An activated carbon filling area is provided inside the housing three, and activated carbon is installed in the activated carbon filling area through the activated carbon support perforated plate. A spray system two is fixedly installed above the activated carbon filling area, and the spiral nozzle of the spray system is installed in the spray port. Gas guide plates are provided at both ends of the activated carbon filling area. Support columns are installed at the bottom of the housing three. A temperature sensor is installed in the activated carbon, and a temperature sensor interface is provided on the outside of the housing three.

[0011] An exhaust pipe protective frame is provided on the outside of the exhaust pipe, and a detection platform is provided on the exhaust pipe protective frame.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] The overall design of this utility model not only reduces the use of treatment liquid while removing odors, but also purifies the gas that reacts with the reagent in the purification tower and prevents the reagent from causing secondary pollution. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall process structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the alkali absorption tower structure of this utility model.

[0016] Figure 3 This is a schematic diagram of the front structure of the photocatalytic oxidation device of this utility model.

[0017] Figure 4 This is a schematic diagram of the end face structure of the photocatalytic oxidation device of this utility model.

[0018] Figure 5 This is a schematic diagram of the ultraviolet lamp tube and titanium dioxide photocatalyst structure of this utility model.

[0019] Figure 6 This is a schematic diagram of the arrangement structure of the purification module of this utility model.

[0020] Figure 7 This is a schematic diagram of the activated carbon adsorption device of this utility model.

[0021] Figure 8 This is a schematic diagram of the spray nozzle and spiral nozzle structure of this utility model.

[0022] Figure 9 This is a schematic diagram of the activated carbon discharge port structure of this utility model.

[0023] Figure 10 This is a schematic diagram of the internal waste gas flow structure of the activated carbon adsorption device of this utility model.

[0024] In the picture:

[0025] Oxidation Absorption Tower 1, Air Guide Pipe 2, Alkali Absorption Tower 3, Shell 31, Air Outlet 32, Manhole Sight Glass 33, Wire Mesh Demisting Device 34, Packing Demisting Device 35, Spray System 36, Packing Layer 37, Packing Support Plate 38, Overflow Outlet 39, Drain Outlet 30, Photocatalytic Oxidation Equipment 4, Shell II 41, Air Inlet II 42, Air Outlet II 43, Filter 44, Ultraviolet Lamp 45, Titanium Dioxide Photocatalyst 46, Lamp Rectifier and Control Circuit Module 47, Drain Outlet II 48, Bottom Oil Drainage Tank 49, Activated Carbon Adsorption Device 5, Shell III 1. Air inlet 3 52. Activated carbon filling port 53. Temperature sensor interface 54. Air outlet 3 55. Drain outlet 3 56. Activated carbon unloading port 57. Support column foot 58. Spray nozzle 59. Spiral nozzle 501. Activated carbon filling area 502. Gas guide plate 503. Activated carbon support perforated plate 504. Circulating water pump 6. Exhaust fan 7. Exhaust stack 8. Exhaust stack protection frame 9. Detection platform 10. Liquid level gauge 11. pH port 12. Water inlet 13. Chemical dosing port 14. Circulating water tank 15. Air inlet 16. PP filter screen 17. Cover 18. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0027] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0028] The present invention will be further described below with reference to the accompanying drawings:

[0029] Example

[0030] Reference Figure 1-10 A solid waste screening exhaust gas treatment system includes an oxidation absorption tower 1, an alkali absorption tower 3, a photocatalytic oxidation device 4, an activated carbon adsorption device 5, a circulating water pump 6, an induced draft fan 7, and an exhaust stack 8. The outlet of the oxidation absorption tower 1 is fixedly connected to the inlet 16 of the alkali absorption tower 3 via a duct 2. The outlet 32 ​​of the alkali absorption tower 3 is fixedly connected to the inlet 42 of the photocatalytic oxidation device 4 via a duct 2. The outlet 43 of the photocatalytic oxidation device 4 is fixedly connected to the inlet 52 of the activated carbon adsorption device 5 via a duct 2. The outlet 55 of the activated carbon adsorption device 5 is fixedly connected to the exhaust stack 8 via the induced draft fan 7.

[0031] The oxidation absorption tower 1 and the alkali absorption tower 3 have the same structure. The alkali absorption tower 3 includes a shell 31, a wire mesh demister 34, a packing demister 35, a spray system 36, a packing layer 37, an overflow port 39, and a drain port 30. At least one manhole sight glass 33 is provided on the shell 31 so that the internal condition of the shell 31 can be observed through the manhole sight glass 33. The wire mesh demister 34, the packing demister 35, the spray system 36, and the packing layer 37 are fixedly installed inside the shell 31 from top to bottom through the packing support plate 38. There are two sets of spray system 36 and packing layer 37. The overflow port 39 and the drain port 30 are fixedly installed on the lower side of the shell 31. The overflow port 39 is above the drain port 30. A replenishment component is provided on the lower outer side of the shell 31.

[0032] Specifically, the packing demister 35 adopts a Φ38 multi-faceted hollow sphere;

[0033] Specifically, the spray system 36 consists of a spray pipe and several spiral nozzles;

[0034] Specifically, the filler layer 37 uses Φ50 multi-faceted hollow spheres.

[0035] The replenishment assembly includes a level gauge 11, a pH port 12, a water inlet 13, a chemical dosing port 14, and a circulating water tank 15. The circulating water tank 15 is fixedly installed on the outside of the housing 31 and communicates with the bottom of the housing 31. The circulating water tank 15 is provided with a chemical dosing port 14 and a pH port 12. The level gauge 11 is installed below the housing 31. The replenishment assembly facilitates timely replenishment of chemicals and circulating water.

[0036] Specifically, the dosing port 14 is connected to an automatic dosing device;

[0037] Specifically, the water inlet 13 is connected to an automatic water replenishment device;

[0038] Specifically, pH meter port 12 is a 45° angled insertion port, allowing the pH meter to be inserted at an angle into the circulating liquid;

[0039] Specifically, the drain outlet 30 is connected to the circulating water tank 15 to facilitate timely discharge of circulating water.

[0040] A cover 18 is detachably installed on the circulating water tank 15, and a PP filter screen 17 is fixedly installed in the circulating water tank 15.

[0041] The photocatalytic oxidation device 4 includes a housing 41, a filter 44, an ultraviolet lamp 45, a titanium dioxide photocatalyst 46, a drain outlet 48, and a bottom oil drain 49. The filter 44 is fixedly installed inside the housing 41 on the side near the air inlet 42. Several sets of ultraviolet lamps 45 and titanium dioxide photocatalysts 46 are arranged alternately inside the housing 41. The lamp rectifier and control circuit module 47 of the ultraviolet lamp 45 are fixedly installed outside the housing 41. The drain outlet 48 is provided at the bottom of the housing 41 to facilitate the drainage of water inside the device. The bottom oil drain 49 is provided at the bottom of the housing 41.

[0042] Specifically, the gas first passes through filter screen 44 to remove small water droplets and impurities before entering the reaction section where ultraviolet lamp tube 45 and titanium dioxide photocatalyst 46 are arranged alternately. The waste gas after reaction treatment is discharged through air outlet 43.

[0043] Specifically, shell 241 is made of 304 stainless steel;

[0044] Specifically, filter screen 44 is made of stainless steel wire mesh.

[0045] The activated carbon adsorption device 5 includes a housing 51, an activated carbon filling port 53, a temperature sensor interface 54, a drain port 56, an activated carbon discharge port 57, support columns 58, a spray nozzle 59, a spiral nozzle 501, an activated carbon filling area 502, a gas guide plate 503, and an activated carbon support perforated plate 504. The activated carbon filling port 53 is located at the top of the housing 51 for convenient filling of activated carbon. The drain port 56 and the activated carbon discharge port 57 are located at the bottom of the housing 51 for convenient unloading of activated carbon. Activated carbon is placed inside the housing 51. The activated carbon filling area 502 is equipped with activated carbon through the activated carbon support plate 504. A second spray system is fixedly installed above the activated carbon filling area 502. The spiral nozzles 501 of the spray system are installed in the spray port 59. Gas guide plates 503 are respectively provided at both ends of the activated carbon filling area 502. An 800mm support column foot 58 is installed at the bottom of the housing 3 51 (for easy removal of activated carbon). A temperature sensor is installed in the activated carbon. A temperature sensor interface 54 for installing the temperature sensor is provided on the outside of the housing 3 51.

[0046] Specifically, the gas guide plate 503 enters the adsorption section in the middle of the activated carbon support perforated plate 504 from the middle to both sides; the adsorbed waste gas comes out from both sides and the middle and is discharged through the air outlet 3 55; for fire safety, when the temperature is greater than 100℃, open the electric valve in front of the spray port 59 and start the spray system 2.

[0047] Specifically, an electric valve is installed at the front end of the spray nozzle 59;

[0048] Specifically, the activated carbon used is Φ4mm and has an iodine adsorption value greater than 800.

[0049] An exhaust pipe protective frame 9 is provided on the outside of the exhaust pipe 8, and a detection platform 10 is provided on the exhaust pipe protective frame 9.

[0050] In this embodiment, the odorous gas first enters the oxidation absorption tower 1 and undergoes primary treatment inside the oxidation absorption tower 1. After treatment, it enters the alkali absorption tower 3 and undergoes secondary treatment inside the alkali absorption tower 3. After secondary treatment, it enters the photocatalytic oxidation device 4 for catalytic treatment. After catalytic treatment, it enters the activated carbon adsorption device 5 for further treatment. Finally, the treated gas is introduced into the exhaust stack 8 by the induced draft fan 7 and discharged from the exhaust stack 8.

[0051] like Figure 1-10 As shown:

[0052] Step 1: The collected malodorous gas enters oxidation washing tower 1, where the strong oxidant oxidizes the malodorous substances into slightly acidic small molecules.

[0053] Step 2: The malodorous gas enters the alkaline washing absorption tower 3, where acid-soluble substances in the waste gas and small-molecule organic acids generated after oxidation are absorbed by the alkali.

[0054] Step 3: Pass the waste gas into the photocatalytic oxidation device 4, where an oxidation reaction occurs under the action of ultraviolet lamps and catalysts;

[0055] Step 4: The waste gas passing through the photocatalytic oxidation device 4 enters the activated carbon adsorption device 5 to remove the odorous substances that could not be treated at the front end.

[0056] Step 5: The treated exhaust gas is sent to the 25m exhaust stack 8 by the induced draft fan 7 and discharged in compliance with standards;

[0057] Step 6: The absorbent liquid can be circulated by the circulation pump 6 and finally discharged into the sewage equalization tank for treatment;

[0058] Step 7: Connect all individual devices in series through inter-tower connecting pipes and air duct 2;

[0059] The oxidant in step 1 is a sodium hypochlorite solution with a concentration of 10%. The alkali in step 2 is a sodium hydroxide solution with a concentration of 30%.

[0060] In steps 1 and 2, the absorption tower is equipped with a packing support plate. The packing is placed on the support plate in a random or orderly manner. The liquid is sprayed onto the packing from the top spray system and flows down along the surface of the packing. The gas enters from the bottom of the tower and flows in a countercurrent state relative to the liquid, continuously passing through the voids of the packing. On the surface of the packing, the gas and liquid phases are in close contact for mass transfer.

[0061] In steps 1 and 2, to facilitate timely discharge of circulating water, the absorption tower has a drain outlet 30 on one side of the tower body. The drain outlet is connected to the circulating water tank 15 and is equipped with an automatic drainage device.

[0062] In steps 1 and 2, the absorption tower is equipped with a packing inlet and a discharge outlet to facilitate packing replacement.

[0063] In steps 1 and 2, the absorbent liquid in the absorption tower is circulated using a circulating pump to ensure the recycling of reagents and water, thus conserving resources. Once saturated, the absorbent passes through an exhaust gas emission device and then enters a wastewater equalization tank for further treatment, ensuring the efficient operation of the treatment system.

[0064] like Figure 2 As shown, during operation, gas is introduced through the air inlet 16, and liquid is sprayed onto the packing material by the spray system 36 and flows down along the surface of the packing material; the gas and liquid flow countercurrently through the voids of the packing layer 37; on the surface of the packing material, the gas and liquid phases are in close contact for mass transfer; the gas after absorption is sent out of the packing absorption tower through the air outlet 32.

[0065] like Figure 2 As shown, the wire mesh demister 34 and the packing demister 35 play a role in reducing the impact of small particles brought up during the operation on the normal operation of the work.

[0066] like Figure 2 As shown, when the liquid flows downward along the packing layer 37, it tends to gradually concentrate towards the tower wall, causing the liquid flow rate near the tower wall to gradually increase. The liquid flowing down from the upper packing layer is collected and sent to the circulating water tank 15, and then sent to the spray system 36 to spray onto the packing layer 37.

[0067] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A solid waste air emissions treatment system, characterized by: The device includes an oxidation absorption tower (1), an alkali absorption tower (3), a photocatalytic oxidation device (4), an activated carbon adsorption device (5), a circulating water pump (6), an induced draft fan (7), and an exhaust stack (8). The air outlet of the oxidation absorption tower (1) is fixedly connected to the air inlet (16) of the alkali absorption tower (3) through a duct (2). The air outlet (32) of the alkali absorption tower (3) is fixedly connected to the second air inlet (42) of the photocatalytic oxidation device (4) through a duct (2). The second air outlet (43) of the photocatalytic oxidation device (4) is fixedly connected to the third air inlet (52) of the activated carbon adsorption device (5) through a duct (2). The third air outlet (55) of the activated carbon adsorption device (5) is fixedly connected to the exhaust stack (8) through the induced draft fan (7).

2. The solid waste screening off-gas treatment system of claim 1, wherein: The oxidation absorption tower (1) and the alkali absorption tower (3) have the same structure. The alkali absorption tower (3) includes a shell (31), a wire mesh demister (34), a packing demister (35), a spray system (36), a packing layer (37), an overflow port (39), and a drain port (30). At least one manhole sight glass (33) is provided on the shell (31). The wire mesh demister (34), the packing demister (35), the spray system (36), and the packing layer (37) are fixedly installed inside the shell (31) from top to bottom through a packing support plate (38). There are two sets of spray system (36) and packing layer (37). The overflow port (39) and the drain port (30) are fixedly installed on the lower side of the shell (31). The overflow port (39) is above the drain port (30). A replenishment component is provided on the lower outer side of the shell (31).

3. A solid waste screening off-gas treatment system as claimed in claim 2, wherein: The replenishment assembly includes a level gauge (11), a pH port (12), a water inlet (13), a chemical dosing port (14), and a circulating water tank (15). The circulating water tank (15) is fixedly installed on the outside of the housing (31) and communicates with the bottom of the housing (31). The circulating water tank (15) is provided with a chemical dosing port (14) and a pH port (12). The level gauge (11) is installed below the housing (31).

4. The solid waste screening off-gas treatment system of claim 3, wherein: The circulating water tank (15) is detachably fitted with a cover (18), and a PP filter screen (17) is fixedly installed in the circulating water tank (15).

5. The solid waste screening off-gas treatment system of claim 1, wherein: The photocatalytic oxidation device (4) includes a housing (41), a filter (44), an ultraviolet lamp (45), a titanium dioxide photocatalyst (46), a drain outlet (48), and a bottom oil drain trough (49). The filter (44) is fixedly installed inside the housing (41) on the side near the air inlet (42). Several sets of ultraviolet lamps (45) and titanium dioxide photocatalysts (46) are arranged alternately inside the housing (41). The lamp rectifier and control circuit module (47) of the ultraviolet lamp (45) are fixedly installed outside the housing (41). The drain outlet (48) is provided at the bottom of the housing (41), and the bottom oil drain trough (49) is provided at the bottom of the housing (41).

6. A solid waste screening off-gas treatment system as claimed in claim 1, wherein: The activated carbon adsorption device (5) includes a housing (51), an activated carbon filling port (53), a temperature sensor interface (54), a drain outlet (56), an activated carbon discharge port (57), a support column (58), a spray nozzle (59), a spiral nozzle (501), an activated carbon filling area (502), a gas guide plate (503), and an activated carbon support perforated plate (504). The activated carbon filling port (53) is provided on the top of the housing (51), and the drain outlet (56) and the activated carbon discharge port (57) are provided on the bottom of the housing (51). The interior of the housing (51) An activated carbon filling area (502) is provided, and activated carbon is installed in the activated carbon filling area (502) through an activated carbon support plate (504). A second spray system is fixedly installed above the activated carbon filling area (502), and the spiral nozzle (501) of the spray system is installed in the spray port (59). Gas guide plates (503) are respectively provided at both ends of the activated carbon filling area (502). A support column foot (58) is installed at the bottom of the housing three (51). A temperature sensor is installed in the activated carbon, and a temperature sensor interface (54) is provided on the outside of the housing three (51).

7. The solid waste screening off-gas treatment system of claim 1, wherein: An exhaust pipe protective frame (9) is provided on the outside of the exhaust pipe (8), and a detection platform (10) is provided on the exhaust pipe protective frame (9).

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