A purification and pollution removal device for dimethyl carbonate raw gas

Abstract

The application discloses a kind of carbon dioxide methyl ester raw gas purification filter pollution devices, it includes horizontally arranged cylinder, coaxial tower type ladder filter assembly and translation pneumatic purging assembly are arranged in the cylinder, the tower type ladder filter assembly includes several end face filter parts and cylinder filter parts that are alternately connected in sequence;The beneficial effects of the application: the tower type ladder filter assembly of the application is designed to filter carbon dioxide methyl ester raw gas, the tower structure can effectively increase the filter area, thereby improving the filtering efficiency;Tower type ladder filter assembly has matching end face filter parts and cylinder filter parts, with axial airflow and radial airflow filtering function, according to the gas direction to axial filtration as main, radial filtration as auxiliary, long service life;According to the actual use characteristics of end face filter parts and cylinder filter parts, design translation pneumatic purging assembly and spray cleaning assembly to clean tower type ladder filter assembly, cleaning is fast and efficient.

Description

Technical Field

[0001] This invention relates to the field of chemical production raw material gas filtration equipment, and in particular to a purification and filtration device for dimethyl carbonate raw material gas. Background Technology

[0002] Currently, the main production process for dimethyl carbonate (DMC) is transesterification. The main process involves reacting propylene oxide with a feed gas (often calcium carbide furnace tail gas, whose main component is CO) to produce propylene carbonate. Then, propylene carbonate is reacted with methanol under a catalyst to obtain dimethyl carbonate. Because the calcium carbide furnace tail gas has a high dust and tar content, it typically undergoes preliminary impurity removal via primary and secondary cyclone separators before being filtered again by a bag filter. However, as the feed gas for dimethyl carbonate production, the calcium carbide furnace tail gas still contains a significant amount of dust and tar. Even after dry bag filter filtration, the tail gas still contains a certain amount of dust and tar, which is insufficient for transportation and comprehensive utilization as a chemical raw material. Therefore, the current... In some technologies, gas filtration devices are used to further filter dust and tar. The main structure of existing technologies includes a conical filter housing with several through holes, and a filter mesh covering the surface of the filter housing, thereby achieving high strength and a certain filtration effect. However, this type of filter also has certain drawbacks: 1. The demand for dimethyl carbonate feed gas is large, and the filtration efficiency per unit time is insufficient. Existing technologies usually increase the size of the filter housing to increase the filtration area, resulting in large filter and mesh sizes, making it difficult to clean, maintain, and replace the mesh; 2. Since the clogging or wear of different parts of the mesh is not completely uniform, the entire mesh needs to be replaced when only a small area of ​​the mesh is damaged, resulting in resource waste. Summary of the Invention

[0003] (a) Technical problems to be solved:

[0004] The purpose of this invention is to provide a purification and filtration device for dimethyl carbonate feedstock gas, in order to solve the technical problems of existing dimethyl carbonate production feedstock gas impurity devices, such as low filtration efficiency, difficulty in cleaning, and resource waste when replacing the wire mesh.

[0005] (II) Technical Solution:

[0006] The present invention discloses a purification and filtration device for dimethyl carbonate feed gas, comprising a horizontally arranged cylindrical body with an air inlet at one end. A tower-type stepped filter assembly and a translational pneumatic purging assembly are coaxially arranged within the cylindrical body. The tower-type stepped filter assembly includes several alternately connected end-face filter sections and cylindrical filter sections. The end-face filter sections filter axial airflow, and the cylindrical filter sections filter radial airflow. An air outlet pipe is provided above the air outlet of the tower-type stepped filter assembly. The translational pneumatic purging assembly is used to purge and clean the end-face filter sections. Spray cleaning assemblies are provided above and below the tower-type stepped filter assembly. A recovery liquid tank is provided at the bottom of the cylindrical body, and a recovery pipeline is connected to the recovery liquid tank and connected to the cylindrical body. The recovery pipeline is located below the air outlet of the tower-type stepped filter assembly. A drain pipe and a liquid level indicator are also provided on the recovery liquid tank.

[0007] Furthermore, the end face filter includes an end face filter plate, on which a plurality of stepped circular grooves are formed. A mesh is installed in the stepped circular grooves, and a quick-release clamping assembly is installed in the stepped circular grooves. The quick-release clamping assembly is used to press the mesh onto the stepped surface of the stepped circular grooves.

[0008] Furthermore, the quick-release clamping assembly includes a pressure ring, a central rod is provided inside the pressure ring, a sliding hole is provided inside the central rod, the sliding hole extends to the outside of the pressure ring, a compression spring is installed inside the sliding hole, and locking pins are provided at both ends of the compression spring. The locking pins are slidably connected to the sliding hole. A locking hole matching the locking pin is provided on the inner wall of the stepped circular groove. A limit rod is connected to the locking pin, and two limit grooves are provided on the central rod. The limit rod is slidably connected to the limit grooves respectively.

[0009] Furthermore, positioning holes are provided on the mesh, and positioning pins that match the positioning holes are provided on the stepped surface of the stepped circular groove. The height of the positioning pins is less than the thickness of the mesh.

[0010] Furthermore, the translational pneumatic purging assembly includes several air-blowing plate assemblies that match the end face filter plate. The air-blowing plate assemblies are connected to a central air pipe. The starting end of the central air pipe is connected to a telescopic corrugated pipe. The telescopic corrugated pipe is connected to a high-pressure nitrogen pipeline. The high-pressure nitrogen pipeline is fixedly installed on the cylinder. A connecting plate is connected to the central air pipe. The connecting plate is connected to the piston rod of the cylinder. The cylinder is fixedly installed on the outer wall of the cylinder.

[0011] Furthermore, the air blowing plate assembly includes a blowing plate, which is annular or circular, and an air chamber is provided inside the blowing plate. The air chamber is connected to the central air pipe, and a plurality of air jet pipes that match the mesh are installed on the blowing plate. The air jet pipes are connected to the air chamber.

[0012] Furthermore, a plurality of sealing ring gaskets matching the mesh are installed on the purge plate, and the jet pipe is located inside the sealing ring gaskets.

[0013] Furthermore, the cylindrical filter section includes a filter cylinder with a plurality of radial grooves formed on the outer circumferential surface of the filter cylinder. A wire mesh tube is fitted onto the filter cylinder, covering the radial grooves. Screws are screwed onto the outer circumferential surface of the filter cylinder to fix the wire mesh tube onto the filter cylinder.

[0014] Furthermore, the spray cleaning assembly includes a high-pressure steam pipeline, on which a plurality of nozzles are evenly distributed along the length of the high-pressure steam pipeline, with the nozzles facing the tower-type stepped filter assembly.

[0015] Furthermore, ball valves are installed on both the high-pressure steam pipeline and the sewage pipeline.

[0016] (III) Beneficial Effects:

[0017] The beneficial effects of this invention are as follows: This invention designs a tower-type stepped filter assembly for filtering dimethyl carbonate feed gas. Its tower structure effectively increases the filtration area, thereby improving filtration efficiency. The tower-type stepped filter assembly is matched with end-face filter sections and cylindrical filter sections, providing both axial and radial airflow filtration functions. Based on the gas direction, axial filtration is primary, with radial filtration as a secondary function, resulting in a more rational layout and longer service life. According to the actual usage characteristics of the end-face filter section and cylindrical filter section, a translational pneumatic purging assembly and a spray cleaning assembly are respectively matched to clean the tower-type stepped filter assembly, making cleaning faster and more efficient. Different wire mesh filter structures are designed according to the actual usage characteristics of the end-face filter section and cylindrical filter section, allowing for individual wire mesh replacement, saving resources, and making installation and disassembly faster and more convenient. This facilitates later overhaul and maintenance of the equipment and is worthy of widespread application. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 A 3D view of a tower-type stepped filter assembly;

[0020] Figure 3 This is the main view of the tower-style stepped filter assembly;

[0021] Figure 4 for Figure 3 Sectional view along AA;

[0022] Figure 5 A three-dimensional view of the wire mesh and the pressure ring;

[0023] Figure 6 A three-dimensional view of the translational pneumatic purging assembly;

[0024] Figure 7 This is a cross-sectional view of the air blowing plate assembly;

[0025] Figure 8 This is a demonstration diagram of the pneumatic purging assembly for blowing the purging mesh.

[0026] In the diagram, the components are: cylinder 1, air inlet 2, air outlet 3, recovery liquid tank 4, recovery pipeline 5, connecting ring 6, end face filter plate 7, filter cylinder 8, radial circular groove 9, stepped circular groove 10, wire mesh cylinder 11, mesh sheet 12, positioning hole 13, pressure ring 14, center rod 15, sliding hole 16, compression spring 17, locking pin 18, limit rod 19, limit groove 20, central air pipe 21, branch pipe 22, purge plate 23, air chamber 24, jet pipe 25, sealing ring gasket 26, high-pressure steam pipeline 29, nozzle 30, sewage discharge pipeline 32, liquid level observer 33, cylinder 34, connecting plate 35, telescopic corrugated pipe 36, locking hole 37, screw 38, high-pressure nitrogen pipeline 39, and cover plate 40. Detailed Implementation

[0027] Example 1

[0028] like Figures 1 to 4As shown, a purification and filtration device for dimethyl carbonate feed gas includes a horizontally arranged cylindrical body 1. An air inlet 2 is provided at one end of the cylindrical body 1. A tower-type stepped filter assembly and a translational pneumatic purging assembly are coaxially arranged within the cylindrical body 1. The tower-type stepped filter assembly includes several alternately connected end-face filter sections and cylindrical filter sections. The end-face filter sections are used to filter axial airflow, and the cylindrical filter sections are used to filter radial airflow. An air outlet pipe 3 is provided above the air outlet end of the tower-type stepped filter assembly. The translational pneumatic purging assembly is used to purge and clean the end-face filter sections. Spray cleaning components are provided above and below the main assembly. Each spray cleaning component includes a high-pressure steam pipeline 29, on which several nozzles 30 are evenly distributed along its length, facing the tower-type stepped filter assembly. The spray cleaning components are used to clean the end-face filter section and the cylindrical filter section. A recovery liquid tank 4 is provided at the bottom of the cylinder 1 to recover the high-pressure steam spray water. A recovery pipeline 5 is connected to the recovery liquid tank 4 to recover the high-pressure spray water that has passed through the tower-type stepped filter assembly. The recovery pipeline 5 is connected to the cylinder 1. The connection is as follows: the recovery pipeline 5 is located below the air outlet of the tower-type stepped filter assembly. A drain pipeline 32 and a level indicator 33 are also installed on the recovery liquid tank 4. The level indicator 33 has a U-shaped structure and is made of transparent material such as glass. Ball valves are installed on both the high-pressure steam pipeline 29 and the drain pipeline 32. When cleaning the end-face filter and the cylindrical filter, due to the airflow direction, in actual use, the end-face filter is the main filter component with a large filtration capacity, making it prone to clogging and difficult to clean thoroughly. The cylindrical filter, on the other hand, is an auxiliary filter component with a small filtration capacity. Therefore, a dedicated [filter / mechanism] is used for the end-face filter. The translational pneumatic purging assembly thoroughly cleans the gas. When using this invention to filter dimethyl carbonate raw material gas, the raw material gas with a certain pressure is introduced into the air inlet 2. After passing through the end face filter and the cylindrical filter, the filtered raw material gas is discharged from the air outlet 3. After long-term use, the end face filter is prone to blockage. At this time, the ball valve on the high-pressure steam pipeline 29 is opened, and the nozzle 30 sprays high-pressure steam to flush the end face filter and the cylindrical filter. However, since the end face filter is a vertical structure and has a large filtration volume, the nozzle 30 is difficult to clean the end face filter thoroughly. At this time, the translational pneumatic purging assembly can be activated to pneumatically purge the end face filter.

[0029] More specifically, such as Figure 2 and Figure 4As shown, the end face filter section includes an end face filter plate 7. In order to improve the filtration effect, the filter plate 7 near the air inlet 2 preferably adopts a circular structure, while the remaining filter plates 7 adopt an annular structure. Several stepped circular grooves 10 are provided on the end face filter plate 7. A mesh 12 is installed in the stepped circular groove 10. A quick-release clamping assembly is installed in the stepped circular groove 10. The quick-release clamping assembly is used to press the mesh 12 onto the stepped surface of the stepped circular groove 10.

[0030] like Figure 4 , Figure 5 and Figure 8 As shown, the quick-release clamping assembly includes a pressure ring 14, a central rod 15 is provided inside the pressure ring 14, a sliding hole 16 is formed inside the central rod 15, the sliding hole 16 extends outside the pressure ring 14, a compression spring 17 is installed inside the sliding hole 16, and locking pins 18 are provided at both ends of the compression spring 17. The locking pins 18 are slidably connected to the sliding hole 16. A locking hole 37 matching the locking pin 18 is formed on the inner wall of the stepped circular groove 10. A limit rod 19 is connected to the locking pin 18, and two limit rods are formed on the central rod 15. The limiting rod 19 is slidably connected to the limiting groove 20. When the locking pin 18 enters the locking hole 37, the pressure ring 14 presses the mesh 12 onto the stepped surface of the stepped circular groove 10. To improve the pressing force, a sealing ring can be set between the mesh 12 and the stepped circular groove 10. To prevent the mesh 12 from falling off under force, a positioning hole 13 is opened on the mesh 12. A positioning pin matching the positioning hole 13 is set on the stepped surface of the stepped circular groove 10. To ensure the pressing effect of the mesh, the height of the positioning pin is less than the thickness of the mesh 12.

[0031] like Figure 1 and Figure 6 As shown, the translational pneumatic purging assembly includes several air-blowing plate assemblies that match the end face filter plate 7. The air-blowing plate assemblies are connected to the central air pipe 21. The starting end of the central air pipe 21 is connected to the telescopic corrugated pipe 36, which has good telescopic performance. The telescopic corrugated pipe 36 is connected to the high-pressure nitrogen pipeline 39, which is fixedly installed on the cylinder 1. A connecting plate 35 is connected to the central air pipe 21. The connecting plate 35 is connected to the piston rod of the cylinder 34. The cylinder 34 is fixedly installed on the outer wall of the cylinder 1. To ensure sealing, a sealing ring is installed between the cylinder 34 and the outer wall of the cylinder 1.

[0032] like Figures 6 to 8As shown, the air-blowing plate assembly includes a purge plate 23, which is annular or circular. The optimal configuration is that the purge plate 23 at the end is circular, while the other purge plates 23 are annular. An air cavity 24 is provided within the purge plate 23. Similarly, the air cavity 24 is machined into annular or circular shapes (specifically, for ease of manufacturing and maintenance, an air cavity groove can be machined first, and then a cover plate 40 and a sealing ring can be placed over the air cavity groove to form the air cavity 24). The air cavity 24 is connected to the purge plate 23... The central air tube 21 is connected. Specifically, the annular purge plate 23 is connected to the central air tube 21 via a branch pipe 22. Several jet pipes 25, matching the mesh 12, are installed on the purge plate 23. These jet pipes 25 are connected to the air chamber 24. To increase the purge pressure and improve the purge effect, several sealing ring gaskets 26, matching the mesh 12, are installed on the purge plate 23. The jet pipes 25 are located within the sealing ring gaskets 26. During purge, as follows... Figure 8 As shown, the starting cylinder 34 pushes out the air blowing plate assembly. When the sealing ring gasket 26 on the blowing plate 23 is pressed against the end face filter plate 7, the blowing plate 23, sealing ring gasket 26, end face filter plate 7, stepped circular groove 10, and mesh 12 form a closed and independent blowing space. The air jet pipe 25 is located in this blowing space and has a good pressure holding function, which can effectively prevent pressure loss and make the blowing more precise, thereby efficiently and thoroughly blowing away the dirt on the mesh 12.

[0033] like Figure 2 As shown, the cylindrical filter section includes a filter cylinder 8, with a plurality of radial grooves 9 formed on the outer circumferential surface of the filter cylinder 8. A wire mesh tube 11 is fitted onto the filter cylinder 8, covering the radial grooves 9. A screw 38 is screwed onto the outer circumferential surface of the filter cylinder 8, and the screw 38 is used to fix the wire mesh tube 11 onto the filter cylinder 8.

[0034] When using this invention, as Figures 1 to 8As shown, dimethyl carbonate feed gas enters the cylinder 1 through the inlet 2, passes through the main filtration of the end face filter and the auxiliary filtration of the cylindrical filter, and is discharged from the outlet pipe 3. Due to its special tower-type filtration structure, the overall filtration area is larger and the filtration efficiency is higher. Because the end face filter has a large filtration capacity, it is prone to clogging and difficult to clean. Therefore, the translational pneumatic purging assembly can be activated periodically to thoroughly purge and clean the end face filter. At the same time, during quarterly or annual equipment overhauls, the screen 12 of the end face filter can be replaced separately according to the actual wear condition, thereby improving the accuracy of maintenance and saving resources. In addition, the invention is designed with a quick disassembly and assembly clamping assembly, which makes the disassembly and installation of the screen 12 convenient and quick, which is conducive to improving maintenance efficiency. Because the cylindrical filter has a smaller filtration capacity and the clogging is not serious, the spray cleaning assembly can be activated periodically to clean the cylindrical filter with steam. The cleaning water is recovered by the recovery liquid tank 4. After the dirt settles, the dirt is discharged through the drain pipe 32.

[0035] 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 alterations 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 purification and filtration device for dimethyl carbonate feed gas, characterized in that: It includes a horizontally arranged cylindrical body with an air inlet at one end. A tower-type stepped filter assembly and a translational pneumatic purging assembly are coaxially arranged within the cylindrical body. The tower-type stepped filter assembly includes several alternately connected end-face filter sections and cylindrical filter sections. The end-face filter sections filter axial airflow, and the cylindrical filter sections filter radial airflow. An air outlet pipe is located above the air outlet end of the tower-type stepped filter assembly. The translational pneumatic purging assembly is used to purge and clean the end-face filter sections. Spray cleaning assemblies are located above and below the tower-type stepped filter assembly. A recovery liquid tank is located at the bottom of the cylindrical body, and a recovery pipeline is connected to the recovery liquid tank. The recovery pipeline is connected to the cylinder body and is located below the air outlet of the tower-type stepped filter assembly. A drain pipeline and a level indicator are also installed on the recovery liquid tank. The end-face filter section includes an end-face filter plate with several stepped circular grooves. A mesh is installed within each stepped circular groove, and a quick-release clamping assembly is installed within the stepped circular grooves to press the mesh against the stepped surface of the grooves. The quick-release clamping assembly includes a pressure ring with a central rod inside. A sliding hole is formed within the central rod, extending outside the pressure ring. A compression spring is installed within the sliding hole. Locking pins are provided at both ends of the compression spring, and the locking pins are slidably connected to the sliding holes. Locking holes matching the locking pins are opened on the inner wall of the stepped circular groove. Limiting rods are connected to the locking pins, and two limiting grooves are opened on the central rod. The limiting rods are slidably connected to the limiting grooves respectively. The translational pneumatic purging assembly includes several air-blowing plate assemblies matching the end face filter plate. The air-blowing plate assemblies are connected to the central air pipe. The starting end of the central air pipe is connected to the telescopic bellows, and the telescopic bellows is connected to the high-pressure nitrogen pipeline. The high-pressure nitrogen pipeline is fixedly installed on the cylinder. A connecting plate is connected to the central air pipe. The connecting plate is connected to the piston rod of the cylinder, and the cylinder is fixedly installed on the outer wall of the cylinder body; the air blowing plate assembly includes a blowing plate, which is annular or circular, and an air chamber is provided inside the blowing plate. The air chamber is connected to the central air pipe. Several air jet pipes that match the mesh are installed on the blowing plate, and the air jet pipes are connected to the air chamber; the cylindrical filter part includes a filter cylinder, and several radial grooves are formed on the outer circumference of the filter cylinder. A wire mesh cylinder is fitted on the filter cylinder, and the wire mesh cylinder covers the radial grooves. Screws are screwed onto the outer circumference of the filter cylinder, and the screws are used to fix the wire mesh cylinder on the filter cylinder.

2. The purification and filtration device for dimethyl carbonate feed gas according to claim 1, characterized in that: Positioning holes are provided on the mesh sheet, and positioning pins that match the positioning holes are provided on the stepped surface of the stepped circular groove. The height of the positioning pins is less than the thickness of the mesh sheet.

3. The purification and filtration device for dimethyl carbonate feed gas according to claim 1, characterized in that: A plurality of sealing ring gaskets matching the mesh are installed on the purge plate, and the jet pipe is located inside the sealing ring gaskets.

4. The purification and filtration device for dimethyl carbonate feed gas according to claim 1, characterized in that: The spray cleaning assembly includes a high-pressure steam pipeline, on which a plurality of nozzles are evenly distributed along the length of the high-pressure steam pipeline, with the nozzles facing the tower-type stepped filter assembly.

5. The purification and filtration device for dimethyl carbonate feed gas according to claim 4, characterized in that: Ball valves are installed on both the high-pressure steam pipeline and the sewage pipeline.

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