A kind of kitchen waste environmental protection treatment gas deep purification device

Abstract

This utility model discloses a deep purification device for the environmentally friendly treatment of kitchen waste gas in the field of food waste treatment. It includes a pre-cleaning chamber and a biological purification chamber connected to each other. The pre-cleaning chamber has an air inlet at the lower front and an air outlet at the upper rear. The biological purification chamber has an air inlet at the lower front and an air outlet at the upper part. The air outlet is connected to a spray deodorization tower via a second pipe. The spray deodorization tower includes a tower body, an air outlet at the top, and an air inlet at the lower side. A spraying mechanism is located inside the tower body, and a return port is located at the bottom. The return port is connected to the inlet of a circulating water tank via a return pipe. The outlet of the circulating water tank is connected to the spraying mechanism via a circulating water pump. The circulating water tank contains spraying alkaline solution. This utility model can deeply deodorize the gas from the environmentally friendly treatment of kitchen waste, ensuring that the exhaust gas meets standards.

Description

Technical Field

[0001] This utility model belongs to the field of kitchen waste treatment, and specifically relates to a deep purification device for environmentally friendly treatment of kitchen waste gas. Background Technology

[0002] Food waste management refers to the treatment of organic waste such as food scraps and waste cooking oil generated in food processing and catering services. It requires classified collection and closed-loop transportation to achieve harmless and resource-based treatment. Food waste generally accounts for over 35% of urban household waste in China, characterized by high moisture and high organic matter content, easily leading to leachate pollution and the spread of pathogens. The main treatment technologies include rotary pulverizers, anaerobic fermentation, aerobic composting, and feed conversion. Mechanical pretreatment and wet anaerobic digestion technologies can convert waste into biogas for power generation and biodiesel, but they also generate odors. These odors are mainly composed of volatile organic compounds and malodorous substances such as hydrogen sulfide and ammonia, requiring deodorization treatment and emissions according to the "Odor Pollutant Emission Standard".

[0003] Currently available deodorizing equipment cannot effectively remove and deodorize acidic odor pollutants such as hydrogen sulfide and lower fatty acids produced in wet anaerobic digestion technology, thus failing to ensure that exhaust emissions meet standards. Utility Model Content

[0004] The purpose of this invention is to provide a deep purification device for the gas used in the environmentally friendly treatment of kitchen waste, which can deeply deodorize the gas used in the environmentally friendly treatment of kitchen waste, and treat and deodorize acidic odor pollutants such as hydrogen sulfide and low fatty acids to ensure that the exhaust gas meets the standards.

[0005] The purpose of this utility model is achieved as follows: A deep purification device for environmentally friendly treatment of kitchen waste includes a pre-cleaning chamber and a biological purification chamber connected to each other. The pre-cleaning chamber has an air inlet at the lower front and an air outlet at the upper rear. The biological purification chamber has an air inlet at the lower front and an air outlet at the upper part. The air outlet is connected to the air inlet via a first pipe, and the air outlet is connected to a spray deodorization tower via a second pipe. The spray deodorization tower includes a tower body, an air outlet at the top, an air inlet at the lower side, a spraying mechanism inside the tower body, and a return port at the bottom. The return port is connected to the inlet of a circulating water tank via a return pipe, and the outlet of the circulating water tank is connected to the spraying mechanism via a circulating water pump. The circulating water tank contains spraying alkaline solution.

[0006] In operation, the gas to be treated enters the pre-cleaning chamber from the bottom and flows upward, where it is pre-cleaned by PP packing. Then, the gas enters the biological purification chamber and flows upward again, where it undergoes biological purification by volcanic rock packing. A secondary spray pipe sprays moisture onto the PP and volcanic rock packing. Finally, the gas enters the spray deodorization tower for alkaline spraying. Alkaline spraying allows the gas and liquid phases to come into close contact on the packing surface for mass transfer. The alkaline solution is sprayed from the top of the spray tower onto the packing via a liquid distributor and flows down the packing surface. Acidic waste gas enters from the bottom inlet of the tower and flows counter-currently through the gaps in the packing layer, utilizing the diffusion and absorption between the relatively flowing water and the acidic gas to achieve mass exchange. Simultaneously, the packing inside the tower increases the gas-liquid contact area, ensuring sufficient residence time for the acidic gas within the tower, significantly improving the absorption efficiency for acidic waste gases such as hydrogen sulfide and lower fatty acids.

[0007] Compared with existing technologies, the beneficial effects of this invention are as follows: acidic gases dissolve in alkaline solutions and flow into the circulating water tank along with the absorbent, thereby purifying the waste gas. The absorbent enters the water circulation tank and, under the action of the circulation pump, flows back to the top of the tower for reuse. This invention can deeply deodorize the gases from the environmentally friendly treatment of kitchen waste, effectively treating and deodorizing acidic odor pollutants such as hydrogen sulfide and lower fatty acids, ensuring that exhaust emissions meet standards.

[0008] As a further improvement of this utility model, a support frame is provided at the bottom of the tower body, and a gap is left between the return port and the ground.

[0009] As a further improvement of this utility model, the circulating water tank is equipped with at least three filter screens spaced along its length. A pH meter is also installed inside the circulating water tank. The spray alkaline solution inside the circulating water tank is a mixed solution of sodium carbonate and sodium hydroxide. A chemical dosing inlet is located at the top of the circulating water tank. The chemical dosing inlet is connected to a chemical dosing pump, which is controlled by an online pH monitoring instrument in the water circulation tank. When the pH value of the aqueous solution in the water circulation tank reaches the set value, the chemical dosing pump automatically starts adding chemicals; when the pH value of the aqueous solution in the water circulation tank reaches the set value, the chemical dosing pump automatically stops adding chemicals. The water in the water circulation tank is changed 1-2 times per day.

[0010] As a further improvement of this utility model, the spraying mechanism includes several deodorizing spray pipes arranged sequentially along the height direction. The deodorizing spray pipes are horizontally arranged, and several nozzles are spaced apart on the lower side of the deodorizing spray pipes. One end of each deodorizing spray pipe is closed, and the other end of the top deodorizing spray pipe extends out of the tower body and is connected to the end of the main liquid supply pipe. The other ends of all other deodorizing spray pipes extend out of the tower body and are connected to the side of the main liquid supply pipe. The other end of the main liquid supply pipe is connected to the outlet of the circulating water pump, and the inlet of the circulating water pump is connected to the inside of the circulating water tank. The main liquid supply pipe is located outside the tower body, and the gas flowing from bottom to top is purified by alkaline spraying through multiple layers of deodorizing spray pipes, which treats and deodorizes acidic odor pollutants such as hydrogen sulfide and lower fatty acids.

[0011] As a further improvement of this utility model, a demister is installed inside the tower body above the top deodorizing spray pipe. A swirl plate and a first packing layer are installed above each of the remaining deodorizing spray pipes. The swirl plate, the first packing layer, and the deodorizing spray pipes are spaced apart from top to bottom. The first packing layer is composed of Pall rings or stepped ring packing. The demister is used to trap fine droplets carried in the purified gas, preventing liquid loss and secondary pollution. The swirl plate allows the sprayed alkaline solution to diffuse, passing through the first packing layer in a counter-current manner with the liquid, increasing the contact area and treatment efficiency.

[0012] For ease of maintenance, several access ports are provided on the side walls of the tower. Maintenance can be carried out inside the tower via a maintenance ladder.

[0013] As a further improvement of this utility model, a second packing layer is provided in the middle of the pre-cleaning chamber, the second packing layer being PP hollow ball packing, and a third packing layer is provided in the middle of the biological purification chamber, the third packing layer being volcanic rock packing.

[0014] As a further improvement of this utility model, the pre-cleaning chamber and the biological purification chamber are each equipped with a secondary spray pipe located above the corresponding packing layer, and several nozzles are spaced apart on the lower side of the secondary spray pipe. The ends of the secondary spray pipes in the pre-cleaning chamber and the biological purification chamber extend outward and are connected to the water supply pipe. The lower part of the pre-cleaning chamber and the biological purification chamber are equipped with a circulating drain outlet, and water is supplied to the nozzles inside the pre-cleaning chamber and the biological purification chamber through the water supply pipe. The PP hollow spheres of the second packing layer pre-clean the gas, and the volcanic rock of the third packing layer biologically purifies the gas. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the spray deodorization tower.

[0017] The components include: 1. Pre-cleaning chamber; 2. Biological purification chamber; 3. Air inlet 1; 4. Gas outlet 1; 5. Air inlet 2; 6. Gas outlet 2; 7. First pipeline; 8. Second pipeline; 9. Spray deodorization tower; 901. Tower body; 902. Air inlet; 903. Air outlet; 904. Return port; 10. Return pipeline; 11. Circulating water tank; 12. Circulating water pump; 13. Support frame; 14. Filter screen; 15. pH meter; 16. Chemical dosing inlet; 17. Deodorization spray pipe; 18. Spray head; 19. Main liquid supply pipe; 20. Demister; 21. Swirl plate; 22. First packing layer; 23. Inspection port; 24. Second packing layer; 25. Third packing layer; 26. Secondary spray pipe. Detailed Implementation

[0018] like Figure 1 and 2 As shown, this is an environmentally friendly gas purification device for kitchen waste treatment, comprising a pre-cleaning chamber 1 and a biological purification chamber 2 connected to each other. The pre-cleaning chamber 1 has a second packing layer 24 in its center, which is made of PP hollow spheres. The biological purification chamber 2 has a third packing layer 25 in its center, which is made of volcanic rock. Both the pre-cleaning chamber 1 and the biological purification chamber 2 have auxiliary spray pipes 26 located above their respective packing layers. Several nozzles 18 are spaced apart on the lower side of the auxiliary spray pipes 26. The ends of the auxiliary spray pipes 26 in both the pre-cleaning chamber 1 and the biological purification chamber 2 extend outwards and are connected to a water supply pipe. The lower part of both the pre-cleaning chamber 1 and the biological purification chamber 2 has a circulating drain outlet, which supplies water to the nozzles 18 inside the pre-cleaning chamber 1 and the biological purification chamber 2 through the water supply pipe. The PP... Hollow spheres pre-clean the gas, and volcanic rock in the third packing layer 25 biologically purifies the gas. An air inlet 3 is located at the lower front of the pre-cleaning chamber 1, and a gas outlet 4 is located at the upper rear of the pre-cleaning chamber 1. An air inlet 5 is located at the lower front of the biological purification chamber 2, and a gas outlet 6 is located at the upper part of the biological purification chamber 2. Gas outlet 4 and air inlet 5 are connected via a first pipe 7, and gas outlet 6 is connected via a second pipe 8 to a spray deodorization tower 9. The spray deodorization tower 9 includes a tower body 90. 1. The bottom of the tower body 901 is provided with a support frame 13, and there is a gap between the return port 904 and the ground; the top of the tower body 901 is provided with an air outlet 903, the lower part of the side of the tower body 901 is provided with an air inlet 902, the inside of the tower body 901 is provided with a spraying mechanism, the bottom of the tower body 901 is provided with a return port 904, the return port 904 is connected to the inlet of the circulating water tank 11 through the return pipe 10, the outlet of the circulating water tank 11 is connected to the spraying mechanism through the circulating water pump 12, and the circulating water tank 11 is filled with spraying alkaline solution.

[0019] The circulating water tank 11 has at least three filters 14 spaced along its length inside. A pH meter 15 is also installed inside the circulating water tank 11. The spray alkaline solution inside the circulating water tank 11 is a mixed solution of sodium carbonate and sodium hydroxide. A chemical dosing inlet 16 is located at the top of the circulating water tank 11. The chemical dosing inlet 16 is connected to a chemical dosing pump, which is controlled by an online pH monitoring instrument in the water circulation tank. When the pH value of the aqueous solution in the water circulation tank reaches the set value, the chemical dosing pump automatically starts adding chemicals; when the pH value of the aqueous solution in the water circulation tank reaches the set value, the chemical dosing pump automatically stops adding chemicals. The water in the water circulation tank is changed 1-2 times per day.

[0020] The spraying mechanism includes several deodorizing spray pipes 17 arranged sequentially along the height direction. The deodorizing spray pipes 17 are horizontally positioned, with several nozzles 18 spaced apart on their lower sides. One end of each deodorizing spray pipe 17 is closed, and the other end of the top deodorizing spray pipe 17 extends out of the tower body 901 and connects to the end of the main liquid supply pipe 19. The other ends of all other deodorizing spray pipes 17 extend out of the tower body 901 and connect to the side of the main liquid supply pipe 19. The other end of the main liquid supply pipe 19 is connected to the outlet of the circulating water pump 12, and the inlet of the circulating water pump 12 is connected to the inside of the circulating water tank 11. The main liquid supply pipe 19 is located outside the tower body 901. Through the multiple layers of deodorizing spray pipes 17, alkaline solution is sprayed onto the upward-flowing gas for purification, effectively treating and deodorizing acidic odor pollutants such as hydrogen sulfide and lower fatty acids.

[0021] Inside the tower body 901, above the top deodorizing spray pipe 17, a demister 20 is installed. Above each of the other deodorizing spray pipes 17, a swirl plate 21 and a first packing layer 22 are installed. The swirl plate 21, the first packing layer 22, and the deodorizing spray pipes 17 are arranged at intervals from top to bottom. The first packing layer 22 is Pall rings or stepped ring packing. The demister 20 is used to intercept fine droplets carried in the purified gas to prevent liquid loss and secondary pollution. The swirl plate 21 allows the sprayed alkaline solution to diffuse and pass through the first packing layer 22 in a countercurrent manner with the liquid, increasing the contact area and treatment efficiency.

[0022] To facilitate maintenance, several maintenance openings 23 are provided on the side wall of tower 901. Maintenance can be carried out inside the tower via maintenance ladders.

[0023] In operation, the gas to be treated enters the pre-cleaning chamber 1 from the bottom and flows upward, where it is pre-cleaned by PP packing. Then, the gas enters the biological purification chamber 2 and flows upward, where it undergoes biological purification by volcanic rock packing. The auxiliary spray pipe 26 sprays moisture onto the PP and volcanic rock packing. Finally, the gas enters the spray deodorization tower 9 for alkaline spraying. Alkaline spraying allows for close contact and mass transfer between the gas and liquid phases on the packing surface. The alkaline solution is sprayed from the top of the spray tower onto the packing via a liquid distributor and flows down the packing surface. Acidic waste gas enters from the bottom inlet of the tower and flows counter-currently through the gaps in the packing layer, utilizing the diffusion and absorption between the relatively flowing water and the acidic gas to achieve mass exchange. Simultaneously, the packing increases the gas-liquid contact area, ensuring sufficient residence time for the acidic gas within the tower, significantly improving the absorption efficiency for hydrogen sulfide, lower fatty acids, and other acidic waste gases. The advantages of this invention are: the acidic gas dissolves in the alkaline solution and flows into the circulating water tank 11 with the absorbent, thereby purifying the waste gas. The absorbent enters a water circulation tank and is then returned to the top of the tower for reuse by a circulation pump. This invention can deeply deodorize the gases from the environmentally friendly treatment of kitchen waste, effectively treating and deodorizing acidic odor pollutants such as hydrogen sulfide and lower fatty acids, ensuring that the exhaust gas meets standards.

[0024] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed in this utility model, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. A deep purification device for environmentally friendly treatment of kitchen waste gas, comprising a pre-cleaning chamber and a biological purification chamber connected to each other, characterized in that, The pre-cleaning chamber has an air inlet at the lower front and an air outlet at the upper rear. The biological purification chamber has an air inlet at the lower front and an air outlet at the upper top. The air outlet and air inlet are connected via a first pipe, and the air outlet is connected via a second pipe to a spray deodorization tower. The spray deodorization tower includes a tower body, an air outlet at the top, an air inlet at the lower side, a spray mechanism inside the tower body, and a return port at the bottom. The return port is connected to the inlet of a circulating water tank via a return pipe, and the outlet of the circulating water tank is connected to the spray mechanism via a circulating water pump. The circulating water tank contains spray alkaline solution.

2. The deep purification device for environmentally friendly treatment of kitchen waste gas according to claim 1, characterized in that, The tower body is equipped with a support frame at the bottom, and a gap is left between the return port and the ground.

3. A deep purification device for environmentally friendly treatment of kitchen waste gas according to claim 1 or 2, characterized in that, The circulating water tank is equipped with at least three filters spaced along its length. It also contains a pH meter and a spray alkaline solution that is a mixture of sodium carbonate and sodium hydroxide. A dosing inlet is located at the top of the circulating water tank.

4. A deep purification device for environmentally friendly treatment of kitchen waste gas according to claim 1 or 2, characterized in that, The spraying mechanism includes several deodorizing spray pipes arranged sequentially along the height direction. The deodorizing spray pipes are horizontally arranged, and several nozzles are spaced apart on the lower side of the deodorizing spray pipes. One end of the deodorizing spray pipe is closed, and the other end of the top deodorizing spray pipe extends out of the tower body and is connected to the end of the main liquid supply pipe. The other ends of the remaining deodorizing spray pipes extend out of the tower body and are connected to the side of the main liquid supply pipe. The other end of the main liquid supply pipe is connected to the outlet of the circulating water pump, and the inlet of the circulating water pump is connected to the inside of the circulating water tank.

5. The deep gas purification device for environmentally friendly treatment of kitchen waste according to claim 4, characterized in that, Inside the tower body, above the top deodorizing spray pipe, there is a demister. Above each of the other deodorizing spray pipes, there is a swirl plate and a first packing layer. The swirl plate, the first packing layer and the deodorizing spray pipes are arranged at intervals from top to bottom. The first packing layer is Pall ring or stepped ring packing.

6. The deep gas purification device for environmentally friendly treatment of kitchen waste according to claim 5, characterized in that, Several inspection ports are provided on the side wall of the tower.

7. A deep purification device for environmentally friendly treatment of kitchen waste gas according to claim 1 or 2, characterized in that, The pre-cleaning chamber has a second packing layer in the middle, which is PP hollow ball packing. The biological purification chamber has a third packing layer in the middle, which is volcanic rock packing.

8. The deep gas purification device for environmentally friendly treatment of kitchen waste according to claim 7, characterized in that, The pre-cleaning chamber and the biological purification chamber are each equipped with a secondary spray pipe above the corresponding packing layer, and several nozzles are spaced apart on the lower side of the secondary spray pipe.

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