A sodium diacetate processing waste gas collecting and processing device

Abstract

The application discloses a kind of sodium diacetate processing waste gas collection and treatment equipment, belong to waste gas collection and treatment equipment technical field, including tower body, exhaust port is arranged on the upper portion of tower body, and air inlet pipe and liquid discharge pipe are respectively fixedly connected from top to bottom on tower body, and switch valve is arranged on liquid discharge pipe, alkali component is arranged on the side of tower body, pressure regulating valve is arranged on alkali component, wire mesh demister component and rain shower component are respectively arranged from top to bottom in tower body, alkali component is connected with wire mesh demister component, wire mesh demister component is connected with rain shower component, the integrated structure and split type structure of wire mesh demister component are switched by adjusting the liquid inlet pressure of alkali liquor of alkali washing, to achieve that sodium diacetate powder particle concentration in waste gas is small or large, both can reduce the degree of powder particle to wire mesh demister component blockage and can maximize efficiency intercepting mist drop.

Description

Technical Field

[0001] This invention relates to the field of waste gas collection and treatment equipment, specifically to a waste gas collection and treatment device for sodium diacetate processing. Background Technology

[0002] The production of sodium diacetate requires acidic raw materials, such as in the acetic acid-sodium acetate process and the acetic anhydride process. After sodium diacetate is produced into granules, it needs to be dried with gas. However, the sodium diacetate granules containing moisture contain acetic acid, so when dried by hot gas flow, acidic vapors are formed and carried away by the gas flow. This drying gas flow containing acidic gases is the waste gas from the sodium diacetate processing. Because it contains acidic components, it can pollute the environment and therefore needs to be collected and treated. The drying gas flow is sent to an alkaline scrubbing tower for collection through pipelines. During its ascent in the alkaline scrubbing tower, it comes into contact with and mixes with the alkaline solution descending in the tower, resulting in an acid-base reaction that neutralizes the acid in the drying gas flow. To reduce the moisture content in the gas flow discharged after neutralization, the alkaline scrubbing... The tower has a wire mesh demister installed on its upper interior to intercept mist droplets in the exhaust gas. The droplets adhere to the wire mesh demister, converge into liquid droplets, and fall back. However, in the actual drying airflow, because the sodium diacetate particles also contain some lighter sodium diacetate powder particles, these particles are sent into the alkaline washing tower along with the drying airflow, easily clogging the mesh of the wire mesh demister. To reduce clogging of the wire mesh demister mesh, existing technology can only deliver a fixed dry airflow within a certain concentration range according to set parameters. However, for sodium diacetate particles processed on other production lines that contain higher concentrations of powder particles, the high concentration of the dry airflow when sent into the alkaline washing tower easily clogs the wire mesh demister, increasing the frequency of maintenance and cleaning of the wire mesh demister and increasing workload. Summary of the Invention

[0003] To address the technical problems mentioned in the background section, the present invention provides a waste gas collection and treatment device for sodium diacetate processing, the technical solution of which is as follows:

[0004] The system includes a tower body with an exhaust port at the top. An air inlet pipe and a liquid outlet pipe are fixedly connected to the tower body from top to bottom. A switch valve is installed on the liquid outlet pipe. An alkaline solution assembly is installed on one side of the tower body, and a pressure regulating valve is installed on the alkaline solution assembly. A wire mesh demister assembly and a deluge assembly are installed inside the tower body from top to bottom. The alkaline solution assembly is connected to the wire mesh demister assembly, and the wire mesh demister assembly is connected to the deluge assembly.

[0005] The alkali solution assembly includes a liquid pump, the outlet of which is connected to an alkali solution pipe. The alkali solution pipe is connected to a pressure regulating valve and a concentration detector, and the alkali solution pipe is connected to a wire mesh demister assembly.

[0006] The alkali solution assembly includes a liquid pump, the outlet of which is connected to an alkali solution pipe, a pressure regulating valve is connected to the alkali solution pipe, and the alkali solution pipe is connected to the wire mesh demister assembly.

[0007] The wire mesh demister assembly includes an upper wire mesh demister movably installed inside the tower body, and a lower wire mesh demister installed below the upper wire mesh demister. The wire mesh of the upper wire mesh demister is arranged horizontally, and the wire mesh of the lower wire mesh demister is arranged vertically. The side of the lower wire mesh demister is fixedly connected to the inner wall of the tower body, and an elastic element is fixedly connected to the bottom of the lower wire mesh demister. One end of the elastic element passes through the center of the upper wire mesh demister and the lower wire mesh demister and is fixedly connected to the upper wire mesh demister.

[0008] The elastic element includes a tube fixedly connected to the bottom of the lower wire mesh demister. The upper and lower ends of the tube are closed structures. A spring and a sealing plug are installed inside the tube. A spring rod is fixedly connected to the upper center of the sealing plug. The spring rod moves through the tube and the center of the lower wire mesh demister and is fixed to the center of the upper wire mesh demister. The spring is sleeved on the spring rod, with its upper end fixedly connected to the inner wall of the tube and its lower end fixedly connected to the upper part of the sealing plug. An alkali inlet pipe is fixedly connected to the side of the tube and is fixedly connected to the alkali pipe. An alkali outlet pipe is fixedly connected to the bottom of the tube.

[0009] The deluge assembly includes a main deluge pipe fixedly connected to the bottom of the alkali outlet pipe, several deluge branch pipes fixedly connected to the main deluge pipe, and several deluge nozzles fixedly connected to the bottom of the deluge branch pipes.

[0010] The present invention has the following advantages:

[0011] 1. When the process pipeline for drying exhaust gas containing low concentrations of sodium diacetate powder is connected to the inlet pipe, the pressure of the alkali solution entering the wire mesh demister assembly is adjusted to 1.2-2 MPa through the pressure regulating valve. After the alkali solution enters the wire mesh demister assembly at this pressure, the wire mesh demister assembly maintains an integrated structure. This results in smaller mesh openings in the wire mesh demister assembly, which, while maintaining high efficiency in intercepting droplets in the exhaust gas, is less affected by blockage from low concentrations of sodium diacetate powder in the exhaust gas.

[0012] When the process pipeline for drying exhaust gas containing high concentrations of sodium diacetate powder is connected to the inlet pipe, the pressure of the alkali solution entering the wire mesh demister assembly is adjusted to 2-2.6 MPa through the pressure regulating valve. After the alkali solution at this pressure enters the wire mesh demister assembly, the wire mesh demister assembly forms a split structure, and the mesh of the wire mesh demister assembly becomes larger. Although the interception efficiency of the mist droplets in the exhaust gas is slightly lower, the degree of clogging of the mesh of the wire mesh demister assembly is greatly reduced.

[0013] 2. When the pressure of the alkaline solution entering the wire mesh demister assembly is turned off from the high pressure, the originally separate wire mesh demister assembly instantly merges into one unit. The upper part falls onto the lower part, causing an impact that shakes off any remaining droplets on the wire mesh demister assembly that have not dripped. This prevents the droplets from remaining on the wire mesh demister assembly for a long time and forming scale, which would cause the mesh of the wire mesh demister assembly to become clogged. Attached Figure Description

[0014] Figure 1 This is a structural diagram of the present invention;

[0015] Figure 2 This is a diagram of the internal structure of the present invention;

[0016] Figure 3 For the present invention Figure 2 A magnified view of a portion of point a;

[0017] Figure 4 The diagram shows the structure of the wire mesh demister assembly and the connection of the deluge assembly of the present invention. Figure 1 ;

[0018] Figure 5 The diagram shows the structure of the wire mesh demister assembly and the connection of the deluge assembly of the present invention. Figure 2 .

[0019] Attached Figures: 1. Tower body, 2. Exhaust port, 3. Air inlet pipe, 4. Liquid outlet pipe, 5. Switch valve, 6. Pressure regulating valve, 7. Deluge nozzle, 8. Liquid pump, 9. Alkali solution pipe, 10. Alkali solution tank, 11. Upper wire mesh demister, 12. Lower wire mesh demister, 13. Tube, 14. Spring, 15. Sealing plug, 16. Spring rod, 17. Alkali solution inlet pipe, 18. Alkali solution outlet pipe, 19. Deluge main pipe, 20. Deluge branch pipe. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention.

[0021] Please refer to Figure 1-5This invention provides a waste gas collection and treatment device for sodium diacetate processing, including a tower body 1. An exhaust port 2 is provided at the top of the tower body 1. Acidic waste gas generated during the drying of sodium diacetate particles is neutralized by alkali washing and then discharged through the exhaust port 2. An inlet pipe 3 and a drain pipe 4 are fixedly connected to the tower body 1 from top to bottom. Waste gas enters the tower body 1 through the inlet pipe 3. A switch valve 5 is provided on the drain pipe 4 to control its opening and closing. Waste liquid inside the tower body 1 can be discharged through the drain pipe 4. An alkaline solution assembly is installed on one side, and a pressure regulating valve 6 is installed on the alkaline solution assembly. The pressure regulating valve 6 controls the output pressure inside the alkaline solution assembly. From top to bottom, a wire mesh demister assembly and a deluge assembly are installed inside the tower body 1. The alkaline solution assembly is connected to the wire mesh demister assembly, and the wire mesh demister assembly is connected to the deluge assembly. The alkaline solution in the alkaline solution assembly first enters the wire mesh demister assembly, and then enters the deluge assembly from the wire mesh demister assembly and is sprayed out in the form of rain, which comes into contact with the rising acidic waste gas and neutralizes the alkaline wash.

[0022] The alkali solution assembly includes a liquid pump 8, the outlet end of which is connected to an alkali solution pipe 9. A pressure regulating valve 6 is connected to the alkali solution pipe 9. The alkali solution pipe 9 is connected to the wire mesh demister assembly. The alkali solution is sent into the alkali solution pipe 9 through the liquid pump 8. The alkali solution in the alkali solution pipe 9 enters the wire mesh demister assembly. The pressure regulating valve 6 regulates the pressure of the alkali solution in the alkali solution pipe 9.

[0023] An alkali tank 10 is provided on one side of the tower body 1. The inlet end of the liquid pump 8 is connected to the alkali tank 10, and the alkali tank 10 provides alkali to the liquid pump 8.

[0024] The wire mesh demister assembly includes an upper wire mesh demister 11 movably disposed within the tower body 1, and a lower wire mesh demister 12 disposed below the upper wire mesh demister 11. The upper wire mesh demister 11 and the lower wire mesh demister 12 are the same size. Both the upper wire mesh demister 11 and the lower wire mesh demister 12 are composed of a circular ring and several evenly arranged unidirectional mesh strips fixedly connected to the circular ring. The several evenly arranged unidirectional mesh strips form a wire mesh with mesh openings. The wire mesh of the upper wire mesh demister 11 is arranged horizontally, and the wire mesh of the lower wire mesh demister 12 is arranged vertically. When the upper wire mesh demister 11 presses down on the upper part of the lower wire mesh demister 12, the upper wire mesh demister 11 and the lower wire mesh demister 12... The wire mesh of the wire mesh demister 12 is arranged in a "cross" shape. The mesh size becomes smaller after assembly. The smaller the mesh size, the better the interception effect of mist droplets in the exhaust gas. The lower wire mesh demister 12 is fixedly connected to the inner wall of the tower body 1 on the side. An elastic element is fixedly connected to the bottom of the lower wire mesh demister 12. One end of the elastic element passes through the center of the upper wire mesh demister 11 and the lower wire mesh demister 12 and is fixedly connected to the upper wire mesh demister 11. The elastic element drives the upper wire mesh demister 11 to move up and down elastically. The wire mesh of the upper wire mesh demister 11 and the lower wire mesh demister 12 are both made of high-strength alloy material. The structure is sturdy and not easily deformed. The mist droplets collide with the bottom of the mesh and condense into liquid droplets, which then drip into the tower body 1.

[0025] The elastic element includes a tube 13 fixedly connected to the bottom of the lower wire mesh demister 12. The tube 13 is fixedly connected to the wire mesh of the lower wire mesh demister 12. The upper and lower ends of the tube 13 are closed structures. A spring 14 and a sealing plug 15 are installed inside the tube 13. A spring rod 16 is fixedly connected to the upper center of the sealing plug 15. The spring rod 16 movably passes through the center of the tube 13 and the lower wire mesh demister 12 and is fixed to the center of the upper wire mesh demister 11. The spring rod 16 is connected to the upper... The wire mesh of the layered wire mesh demister 11 is fixedly connected. The spring 14 is sleeved on the spring rod 16 and its upper end is fixedly connected to the inner wall of the tube 13, and its lower end is fixedly connected to the upper part of the sealing plug 15. An alkaline inlet pipe 17 is fixedly connected to the side of the tube 13. The alkaline inlet pipe 17 is lower than the sealing plug 15 and is connected to the tube 13. The alkaline inlet pipe 17 is fixedly connected to the alkaline pipe 9. An alkaline outlet pipe 18 is fixedly connected to the bottom of the tube 13 and is connected to the alkaline outlet pipe 18.

[0026] The rain shower assembly includes a main rain shower pipe 19 fixedly connected to the bottom of the alkaline solution outlet pipe 18. Several rain shower branch pipes 20 are fixedly connected to the main rain shower pipe 19. Several rain shower nozzles 7 are fixedly connected to the bottom of the rain shower branch pipes 20. The alkaline solution enters the main rain shower pipe 19 through the alkaline solution outlet pipe 18, then enters the rain shower branch pipes 20, and is sprayed downwards in the form of rain through the rain shower nozzles 7.

[0027] Working principle of the invention:

[0028] Please refer to Figure 5 When the inlet pipe 3 is connected to the pipeline carrying the exhaust gas from the drying process of low-concentration sodium diacetate powder, the exhaust gas enters the tower body 1 through the inlet pipe 3. The pressure reducing valve 6 is adjusted, and the alkali solution in the alkali solution tank 10 is pumped into the alkali solution pipe 9 by the liquid pump 8. The pressure of the alkali solution in the alkali solution pipe 9 is adjusted to 1.2-2 MPa, and then enters the alkali solution inlet pipe 17, which in turn enters the tube 13. Because the pressure of this alkali solution is relatively low, it cannot overcome the elastic force of the spring 14 and cannot push the sealing plug 15 upwards. Therefore, the upper wire mesh demister 11 and the lower wire mesh demister 12 are in an overlapping state. The alkali solution in the tube 13 enters through the alkali solution outlet pipe 18. The gas enters the main rain shower pipe 19, then the rain shower branch pipe 20, and is sprayed downwards in the form of rain shower nozzles 7. It comes into contact with the rising exhaust gas to achieve acid-base neutralization. The alkaline solution falls into the tower body 1. The neutralized gas passes through the "cross" shaped wire mesh formed by the superposition of the upper wire mesh demister 11 and the lower wire mesh demister 12, and is discharged through the exhaust port 12. Some of the mist droplets entrained in the gas impact the bottom of the "cross" shaped wire mesh, gather into droplets, and fall into the tower body 1. The mesh of this "cross" shaped wire mesh is small, which has a high interception efficiency for the mist droplets carried in the exhaust gas. At the same time, since the concentration of sodium diacetate powder particles originally carried in the exhaust gas is small, the degree of clogging of the wire mesh is also relatively light.

[0029] Please refer to Figure 4When the inlet pipe 3 is connected to the pipeline carrying the waste gas from the drying process of high-concentration sodium diacetate powder, the waste gas enters the tower body 1 through the inlet pipe 3. The pressure reducing valve 6 is adjusted, and the pressure of the alkali solution in the alkali solution pipe 9 is adjusted to 2-2.6 MPa. Due to the excessive pressure when entering the tube 13, in addition to still entering the alkali solution outlet pipe 18 and finally being sprayed out through the deluge nozzle 7, it also overcomes the elasticity of the spring 14, pushing the sealing plug 15 upwards. The spring 14 is compressed, and the sealing plug 15 drives the spring rod 16 upwards. The spring rod 16 moves through the lower wire mesh demister 12 and drives the upper wire mesh demister 11 upwards, causing... The upper wire mesh demister 11 and the lower wire mesh demister 12 are separated. After separation, the upper wire mesh demister 11 and the lower wire mesh demister 12 return to their original large-diameter unidirectional mesh openings. At this time, they are less likely to cause blockage when facing high-concentration sodium diacetate particles passing through the exhaust gas. Although the effect of removing droplets is slightly reduced due to the larger mesh openings of the upper wire mesh demister 11 and the lower wire mesh demister 12 after separation, the benefits of reducing blockage are far greater than the benefits of reducing droplet interception. Moreover, even after the upper wire mesh demister 11 and the lower wire mesh demister 12 are separated, they can still intercept droplets in the exhaust gas.

[0030] When the equipment is not in use, the alkaline washing process of the high-concentration sodium diacetate powder drying waste gas is shut down, and the liquid pump 8 is turned off. Without the restriction of the alkaline liquid hydraulic pressure, the spring 14 rebounds instantly, causing the sealing plug 15 to drop instantly. This causes the spring rod 16 to drive the upper wire mesh demister 11 to drop instantly. The upper wire mesh demister 11 impacts the lower wire mesh demister 12, generating vibration. This causes the undried droplets on the upper and lower wire mesh demisters 11 and 12 to be shaken off, preventing them from remaining on the upper and lower wire mesh demisters 11 and 12 for a long time and forming scale, which would cause the mesh of the upper and lower wire mesh demisters 11 and 12 to become clogged.

[0031] This invention is simple to operate, convenient to use, and suitable for widespread promotion and application. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste gas collection and treatment device for sodium diacetate processing, comprising a tower body (1), an exhaust port (2) provided on the upper part of the tower body (1), an inlet pipe (3) and a drain pipe (4) fixedly connected from top to bottom on the tower body (1), and a switch valve (5) provided on the drain pipe (4), characterized in that, An alkaline solution assembly is provided on one side of the tower body (1), and a pressure regulating valve (6) is provided on the alkaline solution assembly. A wire mesh demister assembly and a deluge assembly are provided from top to bottom inside the tower body (1). The alkaline solution assembly is connected to the wire mesh demister assembly, and the wire mesh demister assembly is connected to the deluge assembly.

2. The waste gas collection and treatment equipment for sodium diacetate processing according to claim 1, characterized in that, The alkali solution assembly includes a liquid pump (8), the outlet end of which is connected to an alkali solution pipe (9), a pressure regulating valve (6) is connected to the alkali solution pipe (9), and the alkali solution pipe (9) is connected to the wire mesh demister assembly.

3. The waste gas collection and treatment equipment for sodium diacetate processing according to claim 2, characterized in that, An alkali tank (10) is provided on one side of the tower body (1), and the inlet end of the liquid pump (8) is connected to the alkali tank (10).

4. The waste gas collection and treatment equipment for sodium diacetate processing according to claim 2, characterized in that, The wire mesh demister assembly includes an upper wire mesh demister (11) movably disposed inside the tower body (1). A lower wire mesh demister (12) is disposed below the upper wire mesh demister (11). The wire mesh of the upper wire mesh demister (11) is arranged horizontally, and the wire mesh of the lower wire mesh demister (12) is arranged vertically. The side of the lower wire mesh demister (12) is fixedly connected to the inner wall of the tower body (1). An elastic element is fixedly connected to the bottom of the lower wire mesh demister (12). One end of the elastic element passes through the center of the upper wire mesh demister (11) and the lower wire mesh demister (12) and is fixedly connected to the upper wire mesh demister (11).

5. The waste gas collection and treatment equipment for sodium diacetate processing according to claim 4, characterized in that, The elastic element includes a tube (13) fixedly connected to the bottom of the lower wire mesh demister (12). The upper and lower ends of the tube (13) are closed structures. A spring (14) and a sealing plug (15) are provided inside the tube (13). A spring rod (16) is fixedly connected to the center of the upper part of the sealing plug (15). The spring rod (16) moves through the tube (13) and the center of the lower wire mesh demister (12) and is fixed to the center of the upper wire mesh demister (11). The spring (14) is sleeved on the spring rod (16) and its upper end is fixedly connected to the inner wall of the tube (13) and its lower end is fixedly connected to the upper part of the sealing plug (15). An alkali inlet pipe (17) is fixedly connected to the side of the tube (13). The alkali inlet pipe (17) is fixedly connected to the alkali pipe (9). An alkali outlet pipe (18) is fixedly connected to the bottom of the tube (13).

6. The waste gas collection and treatment equipment for sodium diacetate processing according to claim 5, characterized in that, The rain shower assembly includes a main rain shower pipe (19) fixedly connected to the bottom of the alkaline solution outlet pipe (18), a number of rain shower branch pipes (20) fixedly connected to the main rain shower pipe (19), and a number of rain shower nozzles (7) fixedly connected to the bottom of the rain shower branch pipes (20).

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