Phosphoric acid production tail gas treatment device

Abstract

The utility model discloses a phosphoric acid production tail gas treatment device, and belongs to the field of phosphoric acid production tail gas treatment.The phosphoric acid production tail gas treatment device comprises two sets of purification tanks connected with phosphoric acid production tail gas and two sets of fiber demisters arranged in the purification tanks, conversion valves which are respectively connected with the top ends of the two purification tanks through two tail gas outlets are fixedly mounted at the top ends of the two purification tanks; and each conversion valve is provided with a tail gas inlet for introducing tail gas. According to the phosphoric acid production tail gas treatment device, two groups of purification tanks and a conversion valve are arranged, so that when one purification tank needs to be maintained, tail gas can be guided to the other purification tank through the conversion valve, and non-stop maintenance is realized; safety accidents caused by the problems that residual substances in the equipment are not cleaned up during shutdown maintenance, pressure or temperature is not controlled properly and the like are avoided, and the use safety and reliability of the equipment are improved.

Description

Technical Field

[0001] This application relates to the field of phosphoric acid production tail gas treatment technology, specifically a phosphoric acid production tail gas treatment device. Background Technology

[0002] Phosphoric acid production tail gas treatment refers to the purification of tail gas generated during the phosphoric acid production process to remove harmful substances, reduce environmental pollution, and potentially achieve resource recycling.

[0003] Chinese utility model patent CN215939507U discloses a phosphoric acid production tail gas treatment device, including an absorption tower, a tail gas pipeline, a tail gas treatment device, a fiber demister, and a plastic container bottle. The tail gas pipeline is connected to one side of the absorption tower, and a tail gas treatment device with waste liquid recovery function is installed at one end of the tail gas pipeline. The fiber demister is installed inside the tail gas treatment device, and a plastic container bottle is installed at the lower end of the tail gas treatment device. When the fiber demister continuously filters the tail gas, the waste liquid becomes increasingly concentrated. The waste liquid flows from the fiber demister into the guide shroud, then flows into the pipe body through the internal through hole of the guide shroud, and finally flows into the plastic container bottle through the receiving seat, thereby recovering the waste liquid. At the same time, the plastic container bottle is connected to the receiving seat by screws, which facilitates the replacement of the plastic container bottle by the staff.

[0004] However, when this processing device is maintained, it needs to be shut down for maintenance. If the residual substances inside the equipment are not cleaned properly during maintenance, they may cause damage to the equipment when it is restarted. For example, residual waste liquid on the fiber demister may form crystals or scale after drying, affecting the demisting effect or even clogging the equipment. If the pressure or temperature inside the equipment is not properly controlled, it may also cause a safety accident.

[0005] Therefore, this application provides a phosphoric acid production tail gas treatment device to solve the above-mentioned problems. Utility Model Content

[0006] This application provides a phosphoric acid production tail gas treatment device, which aims to solve the problem mentioned in the background art that the existing phosphoric acid production tail gas treatment devices need to be shut down for maintenance, resulting in safety hazards.

[0007] To achieve the above objectives, this application provides the following technical solution: a phosphoric acid production tail gas treatment device, comprising a purification tank for receiving phosphoric acid production tail gas and a fiber demister disposed within the purification tank. Two sets of purification tanks and fiber demisters are provided. A diverting valve is fixedly installed at the top of each of the two purification tanks, connected to the top of each purification tank via two tail gas outlets. Each diverting valve has a tail gas inlet for receiving tail gas. A manifold tee is provided on the side of each purification tank, connected to the two purification tanks via two air inlets. A duct fan is fixedly installed at the air inlet of each manifold tee.

[0008] The bottom of the purification tank is equipped with a collection bottle that communicates with the bottom of the fiber demister to collect liquefied liquid accumulated on the inner wall of the demister. By setting up two sets of purification tanks and a diversion valve, when maintenance is required on one purification tank, the exhaust gas can be diverted to the other purification tank via the diversion valve, achieving maintenance without shutting down the system. This avoids safety accidents caused by incomplete cleaning of internal substances, improper pressure or temperature control, etc., during maintenance shutdowns, thus improving the safety and reliability of the equipment.

[0009] Preferably, the purification tank includes an upper tank and a lower tank that is sealed to the bottom of the upper tank via a flange. The inlet end of the upper tank has an upper connecting pipe that communicates with the exhaust gas outlet. The bottom end of the upper connecting pipe has a first groove for the inlet end of the fiber demister to be engaged. The outlet end of the lower tank has a lower connecting pipe that communicates with the inlet of the collection bottle. The top end of the lower connecting pipe has a second groove for the bottom end of the fiber demister to be engaged.

[0010] Preferably, the inlet end of the collection bottle is connected to the outlet end of the lower half tank via a flange.

[0011] Preferably, both the first and second card slots have sealing rings.

[0012] Preferably, the top and bottom ends of the fiber demister are both abutted against the respective sealing rings.

[0013] Preferably, the top inlet of the upper tank is connected to the exhaust outlet via a flange.

[0014] This phosphoric acid production tail gas treatment device, by setting up two sets of purification tanks and a diversion valve, allows the tail gas to be directed to the other purification tank when maintenance is required in one of the purification tanks. This enables maintenance without shutting down the machine, avoiding safety accidents caused by problems such as residual substances inside the equipment not being cleaned properly or pressure or temperature not being properly controlled during maintenance shutdown, and improving the safety and reliability of the equipment.

[0015] The phosphoric acid production tail gas treatment device has a duct fan fixedly installed at the air inlet end of the manifold tee, which provides power for the tail gas to enter the purification tank, ensuring that the tail gas can smoothly enter the purification tank for treatment, thus improving the effect and efficiency of tail gas treatment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a phosphoric acid production tail gas treatment device.

[0017] Figure 2 This is a schematic diagram of the internal structure of a phosphoric acid production tail gas treatment device.

[0018] In the picture:

[0019] 1. Steering valve; 11. Exhaust gas inlet; 12. Exhaust gas outlet;

[0020] 2. Purification tank; 21. Upper half tank; 211. Upper connecting pipe; 2111. First slot; 22. Lower half tank; 221. Lower connecting pipe; 2211. Second slot;

[0021] 3. Fiber demister;

[0022] 4. Collection bottle;

[0023] 5. Manifold tee; 51. Inlet end; 52. Outlet end;

[0024] 6. Drainage fan; 7. Sealing ring. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] This embodiment provides a phosphoric acid production tail gas treatment device, such as... Figures 1-2 As shown, the phosphoric acid production tail gas treatment device includes a purification tank 2 for the phosphoric acid production tail gas inlet and a fiber demister 3 installed inside the purification tank 2. There are two sets of purification tank 2 and fiber demister 3. The top of the two purification tanks 2 is fixedly installed with a diverting valve 1 that is connected to the top of the two purification tanks 2 through two tail gas outlets 12 respectively. The diverting valve 1 has a tail gas inlet 11 for inleting tail gas. The side of the purification tank 2 has a manifold tee pipe 5 that is connected to the two purification tanks 2 through two air inlet ends 51 respectively. The air inlet end 51 of the manifold tee pipe 5 is fixedly installed with a duct fan 6.

[0027] The bottom of the purification tank 2 is equipped with a collection bottle 4 that is connected to the bottom of the fiber demister 3 to collect the liquefied liquid accumulated on the inner wall of the demister.

[0028] In operation, the phosphoric acid production tail gas enters through the tail gas inlet 11 of the diverting valve 1. Under the control of the diverting valve 1, the tail gas can selectively enter two purification tanks 2 from the two tail gas outlets 1 respectively. The tail gas entering the purification tank 2 comes into contact with the fiber demister 3, which filters and removes mist from the tail gas, removing harmful substances. At the same time, some substances liquefy on the inner wall of the fiber demister 3 to form a liquid. The liquid formed by the liquefaction on the inner wall of the fiber demister 3 is collected through the collection bottle 4, which is connected to the bottom of the purification tank 2 and the bottom of the fiber demister 3. The purified tail gas is discharged from the purification tank 2. The guide fan 6 provides power for the tail gas to enter the purification tank 2 through the air inlet 51 of the manifold tee 5, ensuring that the tail gas can smoothly enter the purification tank 2 for treatment. When maintenance is required on one of the purification tanks 2, the tail gas is diverted to the other purification tank 2 through the diverting valve 1, so that the purification tank 2 that needs maintenance stops working, thus allowing maintenance operations to be performed without stopping the machine.

[0029] Specifically, the purification tank 2 includes an upper tank 21 and a lower tank 22 sealed to the bottom of the upper tank 21 via a flange. The upper tank 21 has an upper connecting pipe 211 at its inlet end that communicates with the exhaust outlet 12. The bottom end of the upper connecting pipe 211 has a first slot 2111 for the inlet end of the fiber demister 3 to be inserted. The lower tank 22 has a lower connecting pipe 221 at its outlet end that communicates with the inlet of the collection bottle 4. The top end of the lower connecting pipe 221 has a second slot 2211 for the bottom end of the fiber demister 3 to be inserted. By setting the first slot 2111 and the second slot 2211, the fiber demister 3 can be easily inserted into the slots for fixation without complicated installation tools and steps, further simplifying the installation and maintenance process.

[0030] Specifically, the inlet end of the collection bottle 4 is connected to the outlet end of the lower half tank 22 via a flange, and the top inlet of the upper half tank 21 is connected to the exhaust gas outlet 12 via a flange. When it is necessary to maintain the interior of the purification tank 2 or replace the fiber demister 3, the upper half tank 21 and the lower half tank 22 can be separated simply by disassembling the flange connection, which reduces the difficulty of maintenance and improves the efficiency of maintenance.

[0031] Furthermore, both the first slot 2111 and the second slot 2211 have sealing rings 7, and the top and bottom ends of the fiber demister 3 are tightly abutted against their respective sealing rings 7. The sealing rings 7 in the first slot 2111 and the second slot 2211 are tightly abutted against the fiber demister 3 during installation, forming a reliable seal. This effectively prevents exhaust gas from leaking from the slots during the treatment process, ensuring the effectiveness of exhaust gas treatment and avoiding pollution to the surrounding environment.

[0032] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A phosphoric acid production tail gas treatment device, comprising a purification tank (2) into which phosphoric acid production tail gas is introduced, and a fiber mist eliminator (3) provided in the purification tank (2), characterized in that: The purification tank (2) and the fiber mist eliminator (3) are provided with two groups, the top of two purification tanks (2) is fixedly installed with a steering valve (1) connected with the top of two purification tanks (2) through two tail gas outlets (12), the steering valve (1) has a tail gas inlet (11) for connecting the tail gas, the side of the purification tank (2) is provided with a confluence tee pipe (5) connected with the two purification tanks (2) through two gas inlets (51), the gas inlet (51) of the confluence tee pipe (5) is fixedly installed with a drainage fan (6); The bottom of the purification tank (2) is provided with a liquid collecting bottle (4) communicated with the bottom end of the fiber mist eliminator (3) for collecting the liquid in the inner wall of the mist eliminator.

2. The apparatus according to claim 1, wherein: The purification tank (2) comprises an upper half tank (21) and a lower half tank (22) sealedly connected with the bottom of the upper half tank (21) through a flange, the upper half tank (21) has an upper butt joint pipe (211) communicated with the tail gas outlet (12) at the inlet end, the bottom end of the upper butt joint pipe (211) has a first clamping groove (2111) for clamping the inlet end of the fiber mist eliminator (3), the outlet end of the lower half tank (22) has a lower butt joint pipe (221) communicated with the inlet of the liquid collecting bottle (4), the top end of the lower butt joint pipe (221) has a second clamping groove (2211) for clamping the bottom end of the fiber mist eliminator (3).

3. The apparatus according to claim 2, wherein: The inlet end of the liquid collecting bottle (4) is connected with the outlet end of the lower half tank (22) through a flange.

4. The apparatus according to claim 3, wherein: The first clamping groove (2111) and the second clamping groove (2211) are both provided with a sealing rubber ring (7).

5. The apparatus according to claim 4, wherein: The top end and the bottom end of the fiber mist eliminator (3) are abutted against the sealing rubber ring (7) in contact therewith.

6. The apparatus according to claim 5, wherein: The top inlet of the upper half tank (21) is connected with the tail gas outlet (12) through a flange.

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