Multistage spray absorption and ammonium sulfate recycling system for ammonia-containing tail gas

Abstract

The utility model relates to ammonia -containing tail gas treatment technical field, and disclose ammonia -containing tail gas multistage spray absorption and ammonium sulfate recycling system, it includes spray tower, be provided with spray pipe in the spray tower, the lower extreme of spray pipe is provided with spray head, the first delivery pump is set up to the one end that spray pipe protrudes spray tower. The ammonium sulfate solution that ammonia -containing tail gas is absorbed can be recycled after being handled by heater, OSLO crystallizer, second circulating pump and compressor, both can reduce production cost, and reduce environmental pollution again, the compressor can compress the steam that is not separated in OSLO crystallizer, improve its temperature and pressure, then it is transported to heater, as the heat source of heater, realize the recycling of heat energy, it is very environmental protection and energy saving, and these vapours can also enter OSLO crystallizer again through heater and handle, make ammonium sulfate can be more fully recovered.

Description

Technical Field

[0001] This utility model belongs to the field of ammonia-containing tail gas treatment technology, specifically a multi-stage spray absorption and ammonium sulfate recycling system for ammonia-containing tail gas. Background Technology

[0002] Synthetic ammonia is widely used in the medical, chemical, and gas industries. In the biosphere, ammonia is a product of nitrogen-fixing bacteria activity, denitrification of nitrogen compounds, and the decomposition of organic nitrogen and animal urine. The main route of ammonia harm to human health is through inhalation. Excessive inhalation of ammonia can cause respiratory diseases, leading to headaches, runny nose, sore throat, loss of smell, excessive sweating, vomiting, and chest pain. It also has a strong irritant effect on the skin and eyes. Therefore, ammonia-containing exhaust gases produced in industrial processes must be purified before being released.

[0003] When ammonia-containing tail gas is absorbed and treated, ammonium sulfate solution is generated. Existing ammonia-containing tail gas treatment equipment is difficult to recycle the ammonium sulfate solution, resulting in high production costs. Therefore, a multi-stage spray absorption and ammonium sulfate recycling system for ammonia-containing tail gas is proposed here. Utility Model Content

[0004] In view of the above situation and to overcome the defects of the prior art, this utility model provides a multi-stage spray absorption and ammonium sulfate recycling system for ammonia-containing tail gas, which effectively solves the problems existing in the treatment of ammonia-containing tail gas.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage spray absorption and ammonium sulfate recycling system for ammonia-containing tail gas, comprising a spray tower, a spray pipe installed inside the spray tower, a spray head installed at the lower end of the spray pipe, a first delivery pump installed at one end of the spray pipe extending out of the spray tower, a one-way valve installed on the spray pipe located on one side of the first delivery pump, a support mesh installed on the inner wall of the spray tower below the spray head, packing material installed at the upper end of the support mesh, a filter screen installed on the inner wall of the spray tower above the spray pipe, and a pipe connecting the lower end of the spray tower to... There is a first circulating pump. A second delivery pump is connected to the lower part of the side wall of the spray tower away from the first circulating pump via a pipe. A heater is installed on the side of the second delivery pump away from the spray tower. A heating pipe is installed inside the heater. A delivery pipe is connected to the upper end of the heater via a flange. An OSLO crystallizer is installed at the end of the delivery pipe away from the heating pipe. A compressor is connected to the upper end of the OSLO crystallizer via a pipe. The output end of the compressor is connected to the side wall of the heater via a pipe. The second circulating pump is connected to the side wall of the OSLO crystallizer located below the delivery pipe via a pipe.

[0006] Preferably, the spray pipe is connected to the side wall of the spray tower via a flange, the spray head is connected to the lower end of the spray pipe via a thread, the output end of the first delivery pump is connected to the spray pipe via a flange, the support mesh and the filter mesh are both bolted to the inner wall of the spray tower, the packing overlaps with the upper end of the support mesh and the inner wall of the spray tower, and an air inlet pipe is connected to the side wall of the spray tower above the first circulating pump via a flange. Ammonia-containing tail gas is transported into the spray tower through the air inlet pipe, and the input pipe of the first delivery pump is inserted into dilute sulfuric acid or other ammonia absorption liquid. In the container, the first delivery pump can draw dilute sulfuric acid or other ammonia absorption liquid during operation and deliver it to the spray pipe. The liquid is then sprayed out as water mist onto the packing material through the spray head. The packing material is a honeycomb-structured multifaceted sphere. Both the packing material and the support mesh are supported by corrosion-resistant engineering plastics. The packing material can greatly increase the contact area between the ammonia-containing tail gas and the absorption liquid entering the spray tower, which helps the mass transfer process between the ammonia-containing tail gas and the absorption liquid in the purification tower. This allows the ammonia in the ammonia-containing tail gas to be fully absorbed. After the ammonia in the ammonia-containing tail gas is absorbed, an ammonium sulfate solution is generated and flows to the bottom of the spray tower.

[0007] Preferably, the input end of the first circulating pump is connected to the lower side wall of the spray tower via a pipe, the output end of the first circulating pump is connected to the spray pipe via a pipe, and the one-way valve is connected to the spray pipe via a thread. When the first circulating pump is working, it can draw a mixture of ammonium sulfate solution and absorbent liquid at the bottom of the spray tower and then transport it to the spray pipe via a pipe, where it is sprayed out through the spray head. This allows the absorbent liquid flowing to the bottom of the spray tower to be recycled, reducing costs. The one-way valve can prevent the return liquid transported to the spray pipe by the first circulating pump from flowing back to the direction of the first pump.

[0008] Preferably, the input end of the second delivery pump is connected to the lower side wall of the spray tower via a pipe, and the output end of the second delivery pump is connected to the side wall of the heater via a pipe. After the spray tower has been working for a period of time, the second delivery pump can be activated to extract the ammonium sulfate solution at the bottom of the spray tower and deliver it to the heater.

[0009] Preferably, the heating tube is bolted to the inner wall of the heater, and the end of the conveying pipe away from the heater is connected to the side wall of the OSLO crystallizer via a flange. The OSLO crystallizer is a publicly available technology. When the heating tube inside the heater is working, it heats the ammonium sulfate solution entering the heater to generate steam. This steam can enter the OSLO crystallizer through the conveying pipe. After being separated by the OSLO crystallizer, the suspended bed inside the OSLO crystallizer allows the ammonium sulfate crystals to grow. Then, the ammonium sulfate slurry is discharged from the bottom of the OSLO crystallizer. The compressor compresses the unseparated steam in the OSLO crystallizer, increasing its temperature and pressure, and then conveys it to the heater as a heat source for the heater, realizing the recycling of heat energy, which is very environmentally friendly and energy-saving. At the same time, this steam can also be re-entered into the OSLO crystallizer through the heater for further processing.

[0010] Preferably, the input end of the second circulation pump is connected to the side wall of the OSLO crystallizer via a pipe, and the output end of the second circulation pump is connected to the side wall of the heater via a pipe. The second circulation pump will extract the ammonium sulfate solution in the OSLO crystallizer and return it to the heater for reheating treatment so that the ammonium sulfate can be fully recovered.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] In this multi-stage spray absorption and ammonium sulfate recycling system for ammonia-containing tail gas, the three-layer support network and packing structure within the spray tower facilitate the mass transfer process between the ammonia-containing tail gas and the absorbent liquid, ensuring full contact between them and significantly improving absorption efficiency. The ammonium sulfate solution produced by the absorption of ammonia-containing tail gas can be recycled after being processed by the heater, OSLO crystallizer, second circulation pump, and compressor, reducing both production costs and environmental pollution. The compressor compresses the unseparated steam in the OSLO crystallizer, increasing its temperature and pressure, and then transports it to the heater as a heat source, achieving heat energy recycling, which is highly environmentally friendly and energy-saving. Simultaneously, this steam can be re-entered into the OSLO crystallizer for further processing, allowing for more complete recovery of ammonium sulfate. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

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

[0015] Figure 2 This is a schematic diagram of the heater in this utility model;

[0016] Figure 3 This utility model Figure 1 A magnified view of a section at point A in the middle;

[0017] In the diagram: 1. Spray tower; 2. Spray pipe; 3. Spray head; 4. First transfer pump; 5. Check valve; 6. Support mesh; 7. Packing; 8. Filter screen; 9. First circulation pump; 10. Second transfer pump; 11. Heater; 12. Heating pipe; 13. Transfer pipe; 14. OSLO crystallizer; 15. Compressor; 16. Second circulation pump; 17. Inlet pipe. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0019] In this embodiment, by Figure 1-3 The present invention includes a spray tower 1, a spray pipe 2 inside the spray tower 1, a spray head 3 at the lower end of the spray pipe 2, a first delivery pump 4 at one end of the spray pipe 2 extending out of the spray tower 1, a one-way valve 5 on the spray pipe 2 located on the side of the first delivery pump 4, a support mesh 6 on the inner wall of the spray tower 1 below the spray head 3, packing material 7 at the upper end of the support mesh 6, a filter screen 8 on the inner wall of the spray tower 1 above the spray pipe 2, a first circulation pump 9 connected to one side of the lower end of the spray tower 1 via a pipe, and a filter screen 8 on the side of the spray tower 1 furthest from the first circulation pump 9. A second delivery pump 10 is connected to the lower part of the side wall via a pipe. A heater 11 is installed on the side of the second delivery pump 10 away from the spray tower 1. A heating pipe 12 is installed inside the heater 11. A delivery pipe 13 is connected to the upper end of the heater 11 via a flange. An OSLO crystallizer 14 is installed at the end of the delivery pipe 13 away from the heating pipe 12. A compressor 15 is connected to the upper end of the OSLO crystallizer 14 via a pipe. The output end of the compressor 15 is connected to the side wall of the heater 11 via a pipe. A second circulation pump 16 is connected to the side wall of the OSLO crystallizer 14 located below the delivery pipe 13 via a pipe.

[0020] The spray pipe 2 is connected to the side wall of the spray tower 1 via a flange, the spray head 3 is connected to the lower end of the spray pipe 2 via a thread, the output end of the first delivery pump 4 is connected to the spray pipe 2 via a flange, the support mesh 6 and the filter mesh 8 are both bolted to the inner wall of the spray tower 1, the packing 7 overlaps with the upper end of the support mesh 6 and the inner wall of the spray tower 1, and an air inlet pipe 17 is connected to the side wall of the spray tower 1 above the first circulating pump 9 via a flange. Ammonia-containing tail gas is transported into the spray tower 1 through the air inlet pipe 17, and the input pipe of the first delivery pump 4 is inserted into a container of dilute sulfuric acid or other ammonia absorption liquid. In the process, the first delivery pump 4 can draw dilute sulfuric acid or other ammonia absorption liquid during operation and deliver it to the spray pipe 2. It is then sprayed out as water mist onto the packing 7 through the spray head 3. The packing 7 is a multi-faceted sphere with a honeycomb structure. Both the packing 7 and the support mesh 6 are supported by corrosion-resistant engineering plastics. The packing 7 can greatly increase the contact area between the ammonia-containing tail gas and the absorption liquid entering the spray tower 1, which helps the mass transfer process between the ammonia-containing tail gas and the absorption liquid in the purification tower, so that the ammonia in the ammonia-containing tail gas can be fully absorbed. After the ammonia in the ammonia-containing tail gas is absorbed, an ammonium sulfate solution is generated and flows to the bottom of the spray tower 1.

[0021] The input end of the first circulating pump 9 is connected to the lower side wall of the spray tower 1 through a pipe, and the output end of the first circulating pump 9 is connected to the spray pipe 2 through a pipe. The one-way valve 5 is connected to the spray pipe 2 through a thread. When the first circulating pump 9 is working, it can draw the mixture of ammonium sulfate solution and absorbent liquid at the bottom of the spray tower 1 and then transport it to the spray pipe 2 through the pipe. It is then sprayed out through the spray head 3. In this way, the absorbent liquid flowing to the bottom of the spray tower 1 can be recycled, reducing costs. The one-way valve 5 can prevent the return liquid transported to the spray pipe 2 by the first circulating pump 9 from flowing back to the direction of the first delivery pump 4.

[0022] The input end of the second delivery pump 10 is connected to the lower side wall of the spray tower 1 through a pipe, and the output end of the second delivery pump 10 is connected to the side wall of the heater 11 through a pipe. After the spray tower 1 has been working for a period of time, the second delivery pump 10 can be activated to extract the ammonium sulfate solution at the bottom of the spray tower 1 and deliver it to the heater 11.

[0023] The heating pipe 12 is bolted to the inner wall of the heater 11, and the end of the conveying pipe 13 away from the heater 11 is connected to the side wall of the OSLO crystallizer 14 via a flange. When the heating pipe 12 in the heater 11 is working, it can heat the ammonium sulfate solution entering the heater 11 to generate steam. This steam can enter the OSLO crystallizer 14 through the conveying pipe 13. After being separated by the OSLO crystallizer 14, the suspended bed in the OSLO crystallizer 14 allows the ammonium sulfate crystals to grow. Then, the ammonium sulfate slurry will be discharged from the lower end of the OSLO crystallizer 14. The compressor 15 will compress the unseparated steam in the OSLO crystallizer 14 to increase its temperature and pressure, and then transport it to the heater 11 as the heat source of the heater 11, realizing the recycling of heat energy, which is very environmentally friendly and energy-saving. At the same time, this steam can also be re-entered into the OSLO crystallizer 14 through the heater 11 for further processing.

[0024] The input end of the second circulation pump 16 is connected to the side wall of the OSLO crystallizer 14 through a pipe, and the output end of the second circulation pump 16 is connected to the side wall of the heater 11 through a pipe. The second circulation pump 16 will extract the ammonium sulfate solution in the OSLO crystallizer 14 and return it to the heater 11 for reheating treatment so that the ammonium sulfate can be fully recovered.

[0025] Working Principle: The multi-stage spray absorption and ammonium sulfate recycling system for ammonia-containing tail gas uses an external power supply and is controlled by external control equipment. Ammonia-containing tail gas is transported to the spray tower 1 through the inlet pipe 17. The input pipe of the first delivery pump 4 is inserted into a container of dilute sulfuric acid or other ammonia absorption liquid. During operation, dilute sulfuric acid or other ammonia absorption liquid can be drawn and transported to the spray pipe 2. It is then sprayed as a water mist through the spray head 3 onto the packing 7, contacting the ammonia-containing tail gas and ensuring that the ammonia in the tail gas is fully absorbed. The absorbed exhaust gas passes through the activated carbon composite filter 8 and is then discharged from the top of the spray tower 1 to other exhaust gas treatment equipment for further treatment before being released. The ammonia in the ammonia-containing exhaust gas, after being absorbed, produces an ammonium sulfate solution, which flows to the bottom of the spray tower 1. When the first circulation pump 9 is working, it draws a mixture of ammonium sulfate solution and absorbent liquid from the bottom of the spray tower 1 and transports it through a pipeline to the spray pipe 2, where it is sprayed out through the spray head 3. This allows the absorbent liquid flowing to the bottom of the spray tower 1 to be recycled, reducing costs. After the spray tower 1 has been working for a period of time, the second transfer pump 10 can be activated to extract the ammonium sulfate solution at the bottom of the spray tower 1 and transfer it to the heater 11. When the heater 11 is working, the heating tube 12 can heat the ammonium sulfate solution entering the heater 11 to generate steam. This steam can enter the OSLO crystallizer 14 through the transfer pipe 13. After being separated by the OSLO crystallizer 14, the suspended bed in the OSLO crystallizer 14 allows the ammonium sulfate crystals to grow. Then, the ammonium sulfate slurry will be discharged from the lower end of the OSLO crystallizer 14. The compressor 15 will compress the unseparated steam in the OSLO crystallizer 14 to increase its temperature and pressure, and then transfer it to the heater 11 as the heat source of the heater 11 to realize the recycling of heat energy. At the same time, this steam can also be re-entered into the OSLO crystallizer 14 through the heater 11 for treatment. The second circulation pump 16 will extract the ammonium sulfate solution in the OSLO crystallizer 14 and return it to the heater 11 for reheating treatment so that the ammonium sulfate can be fully recovered.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage spray absorption and ammonium sulfate recycling system for ammonia-containing tail gas, comprising a spray tower (1), characterized in that: The spray tower (1) is equipped with a spray pipe (2), and a spray head (3) is provided at the lower end of the spray pipe (2). A first delivery pump (4) is provided at one end of the spray pipe (2) extending out of the spray tower (1). A one-way valve (5) is provided on the spray pipe (2) located on the side of the first delivery pump (4). A support net (6) is provided on the inner wall of the spray tower (1) located below the spray head (3). A packing material (7) is provided at the upper end of the support net (6). A filter screen (8) is provided on the inner wall of the spray tower (1) located above the spray pipe (2). A first circulation pump (9) is connected to one side of the lower end of the spray tower (1) through a pipe. A side of the spray tower (1) away from the first circulation pump (9) is provided. A second delivery pump (10) is connected to the lower part of the wall via a pipe. A heater (11) is provided on the side of the second delivery pump (10) away from the spray tower (1). A heating pipe (12) is provided inside the heater (11). A delivery pipe (13) is connected to the upper end of the heater (11) via a flange. An OSLO crystallizer (14) is provided at the end of the delivery pipe (13) away from the heating pipe (12). A compressor (15) is connected to the upper end of the OSLO crystallizer (14) via a pipe. The output end of the compressor (15) is connected to the side wall of the heater (11) via a pipe. A second circulation pump (16) is connected to the side wall of the OSLO crystallizer (14) located below the delivery pipe (13) via a pipe.

2. The multi-stage spray absorption and ammonium sulfate recycling system for ammonia-containing tail gas according to claim 1, characterized in that: The spray pipe (2) is connected to the side wall of the spray tower (1) by a flange. The spray head (3) is connected to the lower end of the spray pipe (2) by a thread. The output end of the first delivery pump (4) is connected to the spray pipe (2) by a flange. The support net (6) and the filter net (8) are both connected to the inner wall of the spray tower (1) by bolts. The packing (7) overlaps with the upper end of the support net (6) and the inner wall of the spray tower (1). An air inlet pipe (17) is connected to the side wall of the spray tower (1) above the first circulating pump (9) by a flange.

3. The multi-stage spray absorption and ammonium sulfate recycling system for ammonia-containing tail gas according to claim 1, characterized in that: The input end of the first circulating pump (9) is connected to the lower side wall of the spray tower (1) through a pipe, the output end of the first circulating pump (9) is connected to the spray pipe (2) through a pipe, and the one-way valve (5) is connected to the spray pipe (2) through a threaded connection.

4. The multi-stage spray absorption and ammonium sulfate recycling system for ammonia-containing tail gas according to claim 1, characterized in that: The input end of the second delivery pump (10) is connected to the lower side wall of the spray tower (1) through a pipe, and the output end of the second delivery pump (10) is connected to the side wall of the heater (11) through a pipe.

5. The multi-stage spray absorption and ammonium sulfate recycling system for ammonia-containing tail gas according to claim 1, characterized in that: The heating tube (12) is bolted to the inner wall of the heater (11), and the end of the delivery tube (13) away from the heater (11) is connected to the side wall of the OSLO crystallizer (14) via a flange.

6. The multi-stage spray absorption and ammonium sulfate recycling system for ammonia-containing tail gas according to claim 1, characterized in that: The input end of the second circulation pump (16) is connected to the side wall of the OSLO crystallizer (14) through a pipe, and the output end of the second circulation pump (16) is connected to the side wall of the heater (11) through a pipe.

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