Ammonia gas absorption device for aluminum ash treatment
By detecting the ammonia gas volume in real time at the ammonia gas production and adjusting the flow rate of cold pure water, combined with the design of the nozzle and the water-through plate, the problem that the input amount of cold pure water in the ammonia absorption device cannot match the ammonia gas volume, achieving efficient absorption of ammonia gas and stabilization of ammonia water concentration.
Patent Information
- Application Number
- CN202421282908.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-06-06
AI Technical Summary
The existing ammonia absorption device cannot adjust the amount of cold pure water as the amount of ammonia gas changes, resulting in unstable ammonia water concentration and insufficient dispersion during the drop of cold pure water, resulting in incomplete absorption of ammonia.
By setting up a gas flowmeter at the ammonia gas generation, the ammonia gas volume is detected in real time and the flow rate of the cold pure water pump is adjusted according to the flow rate to ensure that the cold pure water input matches the ammonia gas. At the same time, multiple nozzles and water-through plates are used to disperse the drops of cold pure water to ensure full contact with ammonia.
The matching of cold pure water and ammonia flow rate is achieved, the problems of unstable ammonia water concentration and incomplete ammonia absorption are avoided, the ammonia absorption efficiency is improved, and ammonia emissions are reduced.
Smart Images
Figure CN222586066U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of tail gas absorption, and specifically relates to an ammonia absorption device for aluminum ash treatment. Background Art
[0002] Ammonia gas is produced during the hydrolysis of aluminum ash. Currently, low-temperature cold pure water is used to absorb ammonia gas for treatment. A density meter is used to detect the ammonia concentration at the bottom of the ammonia absorption tower. The density meter signal controls the flow of the cold pure water pump. If the density value is small, the ammonia concentration is high, and the flow of the cold pure water pump is increased to dilute the ammonia concentration at the bottom of the ammonia absorption tower to a normal value; if the density value is large, the ammonia concentration is low, and the flow of the cold pure water pump is reduced. The high-concentration ammonia water at the top dilutes the ammonia concentration at the bottom to a normal value. This method is used to ensure the stability of the concentration of the produced ammonia water.
[0003] However, the above-mentioned ammonia absorption method has the following disadvantages: in the actual production process, due to the fluctuation of the aluminum ash feed amount, the amount of ammonia produced by the hydrolysis of aluminum ash will also fluctuate, and the amount of cold pure water added cannot change with the change of the ammonia amount, resulting in a small flow rate of Angel but a large amount of cold pure water added, and the concentration of the produced ammonia water is low, which needs to be adjusted to extend the processing time; and when the ammonia flow rate is large but the amount of cold pure water added is small, the ammonia cannot be completely absorbed, polluting the atmospheric environment, and the current ammonia absorption tower is composed of three ammonia absorption layers through three fillers, and the cold pure water enters the ammonia absorption tower and directly falls on the upper filler to form another ammonia absorption layer. The four ammonia absorption layers ensure that the cold pure water fully absorbs the ammonia, but the upper cold pure water does not disperse during the falling process, and it cannot be guaranteed that the ammonia after passing through the three layers of fillers is fully absorbed, and there is a risk of ammonia discharge. Summary of the invention
[0004] In order to solve the problems that the amount of cold pure water added in the existing ammonia absorption device cannot be adjusted as the amount of ammonia changes, and the water flow is not dispersed enough during the falling process of the cold pure water above the filler, resulting in incomplete absorption of ammonia, the utility model provides an ammonia absorption device for aluminum ash hydrolysis, which detects the flow change of ammonia generated by the hydrolysis of aluminum ash before it is input into the tower body through a gas flow meter, and then adjusts the flow of the cold pure water pump at any time to match the amount of cold pure water input with ammonia, avoid incomplete absorption or waste, and at the same time, the cold pure water is dispersed and dropped by setting a plurality of first nozzles, and cooperates with the water pass plate to ensure the dispersed falling effect.
[0005] In order to achieve the above purpose, the technical solution of the utility model is:
[0006] An ammonia absorption device for aluminum ash treatment comprises a reaction tank and a tower body, wherein the reaction tank is connected to the lower end of the tower body through a gas pipeline, a gas flow meter is provided at one end of the gas pipeline close to the reaction tank, a water inlet pipe is connected to the upper end of the tower body, one end of the water inlet pipe extends into the tower body and is connected to a plurality of first nozzles, and the other end is connected to a cold pure water storage tank, the cold pure water storage tank is connected to a water adding pipe, a cold pure water pump is provided on the water inlet pipe, and the cold pure water pump is located outside the tower body, the change of the amount of ammonia generated by the reaction tank is detected by the gas flow meter, and the flow rate of cold pure water entering the tower body is adjusted by the cold pure water pump.
[0007] A circulation pipe is arranged at the lower end of the tower body, and the other end of the circulation pipe extends into the upper end of the tower body. A circulation pump is arranged on the circulation pipe. A plurality of second nozzles are fixedly connected to the upper end of the circulation pipe after the upper end of the circulation pipe extends into the tower body. The water inlet pipe at the upper end of the tower body is staggered with the circulation pipe, so that the newly added cold pure water and the cold pure water transported by the circulation pipe fall in a staggered and dispersed manner to ensure sufficient contact with the ammonia gas.
[0008] A water flow plate is arranged below the first nozzle and the second nozzle, and a plurality of water flow holes are opened on the water flow plate. Newly added cold pure water and circulating cold pure water are mixed on the water flow plate and dispersed and dropped through the water flow holes.
[0009] Preferably, the water inlet pipe and the circulation pipe at the upper end of the tower body are both arranged in a ring shape to ensure the dispersion effect of the cold pure water.
[0010] Preferably, three fillers are arranged in the tower body at upper and lower intervals, and the fillers are all located below the water pass plate, and ammonia is absorbed by the multiple fillers.
[0011] Preferably, there are multiple reaction tanks, which are connected in sequence through pipelines. The tops of the reaction tanks are connected to gas pipes, and the ammonia generated by the reaction is sent to the tower body for absorption through the gas pipes.
[0012] Preferably, a drain pipe is provided at the lower end of the tower body, and the drain pipe is connected to an ammonia water storage tank, through which the generated ammonia water is stored.
[0013] Preferably, a gas outlet is provided at the top of the tower body to discharge the gas after the ammonia is absorbed.
[0014] Through the above technical solution, the beneficial effects of the utility model are:
[0015] 1. The utility model detects the flow rate of ammonia generated in the reaction tank by arranging a gas flow meter at one end of the reaction tank near the gas transmission pipe, so that the cold pure water pump adds corresponding cold pure water according to the amount of ammonia entering the tower body, effectively ensuring the absorption of ammonia while avoiding low concentration of ammonia water.
[0016] 2. The utility model arranges a plurality of first nozzles on the water inlet pipe extending into the upper end of the tower body to ensure the rapid diffusion of cold pure water after entering the tower body, ensure the full contact between ammonia gas after passing through three layers of fillers and the diffused cold pure water, effectively ensure the full absorption of ammonia gas, and prevent the gas discharged from the surface of the tower body from containing ammonia gas and causing pollution.
[0017] 3. The utility model uses a circulating pump to extract ammonia water from the lower end of the tower body and transport it to the upper end, and sprays it through multiple second nozzles, effectively ensuring the utilization of cold pure water during the ammonia absorption process and ensuring the concentration of ammonia water.
[0018] 4. The utility model staggers the water inlet pipe and the circulation pipe at the upper end of the tower body and sets them in a ring shape, and sets a water pass plate therebelow to ensure rapid diffusion of cold pure water. At the same time, the cold pure water is mixed with the ammonia water transported by the circulation pipe to make the absorption of ammonia more thorough and ensure the concentration of the prepared ammonia water. The water pass plate is used to ensure that the cold pure water falling from above evenly falls on the filler, so that it quickly diffuses on the filler. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 A schematic structural diagram of the utility model.
[0020] Figure 2 It is a structural schematic diagram of the tower body of the utility model.
[0021] Figure 3 This is a schematic diagram of the structure in which the water inlet pipe and the circulation pipe of the utility model are located in the tower body.
[0022] The numbers in the accompanying drawings are: 1 is a reaction tank, 2 is a tower body, 3 is a gas transmission pipe, 4 is a gas flow meter, 5 is a water inlet pipe, 6 is a first nozzle, 7 is a cold pure water storage tank, 8 is a cold pure water pump, 9 is a circulation pipe, 10 is a circulation pump, 11 is a second nozzle, 12 is a water plate, 13 is a water hole, 14 is a water adding pipe, 15 is a filler, 16 is a drain pipe, and 17 is an air outlet. DETAILED DESCRIPTION
[0023] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:
[0024] like Figure 1 to Figure 3As shown, this embodiment provides an ammonia absorption device for aluminum ash treatment, including a reaction tank 1 and a tower body 2. The reaction tank 1 is connected to the lower end of the tower body 2 through a gas pipe 3. There are multiple reaction tanks 1, and the multiple reaction tanks 1 are connected in sequence through pipelines. The tops of the reaction tanks 1 are all connected to the gas pipe 3. The gases generated in the multiple reaction tanks 1 are transported to the tower body 2 through the gas pipe 3, and the ammonia therein is absorbed and then discharged to avoid pollution. A gas flow meter 4 is provided at one end of the gas pipe 3 near the reaction tank 1. The model of the gas flow meter 4 is DYUXB-15016. The gas flow meter 4 detects the flow of ammonia passing through the gas pipe 3, and then determines the amount of ammonia input to the tower body 2. The amount of ammonia in the tower body 2 is adjusted, and the amount of cold pure water entering the tower body 2 through the water inlet pipe 5 is adjusted, and the cold pure water entering the tower body 2 is sprayed out through the multiple first nozzles 6, and then quickly diffused. The cold pure water storage tank 7 is connected to a water adding pipe 14, and cold pure water is added to the cold pure water storage tank 7 through the water adding pipe 14.
[0025] The lower end of the tower body 2 is provided with a circulation pipe 9, the other end of the circulation pipe 9 extends into the upper end of the tower body 2, a circulation pump 10 is provided on the circulation pipe 9, and a plurality of second nozzles 11 are fixedly connected to the upper end of the circulation pipe 9 after the upper end of the circulation pipe 9 extends into the tower body 2. The water inlet pipe 5 at the upper end of the tower body 2 is staggered with the circulation pipe 9. After the cold pure water enters the tower body 2, it falls and contacts with the rising ammonia gas, absorbs the ammonia gas, and absorbs the ammonia water to fall at the lower end of the tower body 2. When the ammonia absorption amount is small, the ammonia water concentration is low, and the circulation The ring pump 10 transports the lower layer of ammonia water to the upper end of the tower body 2 through the circulation pipe 9, and then sprays it out through multiple second nozzles 11, quickly diffuses in the tower body 2, and absorbs the upward ammonia gas again. The water inlet pipe 5 and the circulation pipe 9 at the upper end of the tower body 2 are both arranged in a ring shape to ensure that an ammonia absorption layer is formed after the cold pure water and the ammonia water diffuse, thereby ensuring the absorption effect of ammonia gas. At the same time, the falling ammonia water is mixed with the cold pure water sprayed from the first nozzle 6 to ensure the thorough absorption of the rising ammonia gas, thereby effectively avoiding the discharge of ammonia gas.
[0026] A water pass plate 12 is arranged below the first nozzle 6 and the second nozzle 11, and a plurality of water pass holes 13 are opened on the water pass plate 12. The cold pure water entering the tower body 2 and the ammonia water transported by the circulation pipe 9 fall on the water pass plate 12 through the first nozzle 6 and the second nozzle 11 respectively, and continue to fall through the water pass holes 13. In this process, the cold pure water and the ammonia water are mixed and dispersed and fall, on the one hand, absorbing the rising ammonia gas, and on the other hand, three fillers 15 are arranged at upper and lower intervals in the tower body 2, and the fillers 15 are all located below the water pass plate 12. Through the evenly distributed water pass holes 13, the fillers 15 are evenly dispersed and fall on the fillers 15, and quickly diffuse on the fillers 15.
[0027] A drainage pipe 16 is provided at the lower end of the tower body 2, and the drainage pipe 16 is connected to an ammonia water storage tank (not shown in the figure). The cold pure water that has absorbed the ammonia gas is discharged into the ammonia water storage tank through the drainage pipe 16 for storage while ensuring the ammonia water concentration.
[0028] The top of the tower body 2 is provided with a gas outlet 17 , and the gas is discharged through the gas outlet 17 after absorbing the ammonia.
[0029] When in use, aluminum ash is hydrolyzed in the reaction tank 1 to produce ammonia gas which is discharged into the gas delivery pipe 3 and transported to the lower end of the tower body 2 through the gas delivery pipe 3. The cold pure water in the cold pure water storage tank 7 is transported to the upper end of the tower body 2 through the cold pure water pump 8. The cold pure water falls in the tower body 2 to absorb the ammonia gas rising in the tower body 2, forming ammonia water falling at the lower end of the tower body 2. At the same time, the ammonia flow rate passing through the gas delivery pipe 3 is detected by the gas flow meter 4, and the amount of ammonia gas input to the tower body 2 is determined. The cold pure water is adjusted according to the amount of ammonia gas input to the tower body 2. The flow rate of the water pump 8 is adjusted, and the amount of cold pure water entering the tower body 2 through the water inlet pipe 5 is adjusted. The cold pure water entering the tower body 2 is sprayed out through multiple first nozzles 6, and then quickly diffuses. The cold pure water falls on the water pass plate 12, and evenly falls on the filler 15 through the water pass holes 13 and quickly diffuses. The cold pure water diffused on the three-layer filler 15 absorbs most of the rising ammonia, and the cold pure water falling from the top of the filler 15 absorbs the ammonia that has not been completely absorbed by the filler 15, so as to avoid being discharged from the tower body 2 and causing pollution.
[0030] The cold pure water absorbs ammonia gas and becomes ammonia water, which falls on the lower end of the tower body 2. When the amount of ammonia gas absorbed is small, the concentration of ammonia water is low. The circulation pump 10 transports the lower layer of ammonia water to the upper end of the tower body 2 through the circulation pipe 9, and then sprays it through multiple second nozzles 11, quickly diffuses in the tower body 2, and absorbs the upward ammonia gas again, and mixes with the cold pure water sprayed from the first nozzle 6, to ensure the thorough absorption of the rising ammonia gas, effectively avoid the discharge of ammonia gas, and ensure the concentration of the generated ammonia water and the utilization of the cold pure water.
[0031] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.
Claims
1. An ammonia absorption device for aluminum ash treatment, characterized in that: The invention comprises a reaction tank (1) and a tower body (2), wherein the reaction tank (1) and the lower end of the tower body (2) are connected via an air delivery pipe (3), a gas flow meter (4) is arranged at one end of the air delivery pipe (3) close to the reaction tank (1), the upper end of the tower body (2) is connected to a water inlet pipe (5), one end of the water inlet pipe (5) extends into the tower body (2) and is connected to a plurality of first nozzles (6), and the other end is connected to a cold pure water storage tank (7), the cold pure water storage tank (7) is connected to a water supply pipe (14), a cold pure water pump (8) is arranged on the water inlet pipe (5), and the cold pure water pump (8) is located outside the tower body (2); A circulation pipe (9) is arranged at the lower end of the tower body (2), the other end of the circulation pipe (9) extends into the interior of the upper end of the tower body (2), a circulation pump (10) is arranged on the circulation pipe (9), a plurality of second nozzles (11) are fixedly connected to the upper end of the circulation pipe (9) after the upper end of the circulation pipe (9) extends into the interior of the tower body (2), and the water inlet pipe (5) at the upper end of the tower body (2) is staggered with the circulation pipe (9); A water flow plate (12) is provided below the first nozzle (6) and the second nozzle (11), and a plurality of water flow holes (13) are provided on the water flow plate (12).
2. The ammonia absorption device for aluminum ash treatment according to claim 1, characterized in that: The water inlet pipe (5) and the circulation pipe (9) at the upper end of the tower body (2) are both arranged in a ring shape.
3. The ammonia absorption device for aluminum ash treatment according to claim 1, characterized in that: Three fillers (15) are arranged in the tower body (2) at intervals in the upper and lower parts, and the fillers (15) are all located below the water passing plate (12).
4. The ammonia absorption device for aluminum ash treatment according to claim 1, characterized in that: There are a plurality of reaction tanks (1), and the plurality of reaction tanks (1) are connected in sequence via pipelines, and the tops of the reaction tanks (1) are all connected to the gas delivery pipe (3).
5. The ammonia absorption device for aluminum ash treatment according to claim 1, characterized in that: A drainage pipe (16) is provided at the lower end of the tower body (2), and the drainage pipe (16) is connected to an ammonia water storage tank.
6. The ammonia absorption device for aluminum ash treatment according to claim 1, characterized in that: An air outlet (17) is provided at the top of the tower body (2).