CO2 gas impurity removal purification system

Abstract

This application relates to the field of gas purification technology, specifically to a CO2 gas purification system. The inlet and outlet of this CO2 gas purification system are vertically aligned with the filter chamber. Sealed end plates are rotatably connected to both ends of the filter chamber, which contains a filter cartridge and a filter bag. The filter cartridge is fixed to the end plates on both sides of the filter chamber and can rotate axially under the drive of a motor. The filter cartridge is tilted relative to the system. Exhaust valves are provided on the filter chamber and the outlet, and an inlet valve is provided in the inlet. The inlet and exhaust valves are connected to a detection device, a motor, and a control system. This CO2 gas purification system efficiently utilizes filter cloth, facilitates filter cloth replacement, has a high degree of automation, and offers high safety performance. It effectively filters impurities in the gas, thereby effectively reducing defects that enter the slurry with the gas.

Description

Technical Field

[0001] This utility model relates to the field of gas purification technology, specifically to a CO2 gas purification system. Background Technology

[0002] Producing high-whiteness carbon-content products requires a slurry from the carbonation process of sintering as raw material. The continuous carbonation decomposition process mainly includes physicochemical processes such as the reaction of CO2 with sodium aluminate solution and the crystallization of aluminum hydroxide. An externally supplied high-pressure air system transports the slurry from the first tank to the last. CO2 gas is present throughout the continuous carbonation process; however, during transport, the CO2 gas is easily contaminated by impurities on the pipe walls, producing reddish-black defects. These defects enter the solution with the gas, causing the defects and whiteness indicators in the solution to exceed standards, severely affecting the quality indicators of subsequent high-whiteness carbon-content products.

[0003] In existing technologies, the axial ends of the filter are usually used as the air inlet and outlet, and multiple filter bags or filter layers are arranged in the radial direction to filter the gas, such as Chinese patents CN210728940U and CN208660615U. However, since the air inlet and outlet need to be connected to other pipelines in the system, and in order to achieve better impurity removal, the inlet and outlet positions are usually narrowed, which makes it inconvenient to replace or remove the filter cloth. In addition, as the usage time increases, scale or impurities tend to accumulate in the places where the gas accumulates, while other parts still do not reach their maximum efficiency. Frequent replacement of filter bags or filter layers is cumbersome and has low work efficiency. Utility Model Content

[0004] Therefore, in order to solve the problems in the prior art, this utility model provides a CO2 gas purification system that is easy to replace the filter cloth and has high filter cloth utilization efficiency. The specific technical solution is as follows:

[0005] A CO2 gas purification system includes: a cylindrical inlet, a cylindrical filter chamber, and a cylindrical outlet. The inlet and outlet are symmetrically connected to two sides of the filter chamber perpendicular to its axial direction. A first end cap is rotatably connected to one side of the filter chamber, and a second end cap is rotatably connected to the other side. The first and second end caps comprise a connecting structure of a circular cover plate and a hollow cylinder. The outer side of the connecting structure has multiple retractable annular protrusions. The inner sides of both ends of the filter chamber have grooves that match the annular protrusions. The outer diameter of the connecting structure is equal to the inner diameter of the filter chamber. The filter chamber is equipped with an intake valve and a second exhaust valve. The intake valve is located at the end of the filter chamber furthest from the outlet. The outlet has a rigid filter cartridge and a flexible filter bag. The filter cartridge is fixed to a first end cap and a second end cap at both ends. The flexible filter bag is fixed to the inner wall of the filter cartridge. The filter holes of the filter cartridge are larger than those of the filter bag. A rotary motor is connected to the first and second end caps. The second exhaust valve is connected to an automatic detection device. The automatic detection device, intake valve, and rotary motor are connected to a control system.

[0006] Furthermore, the first exhaust valve and the exhaust port are located on the same horizontal line.

[0007] Furthermore, the air inlet and outlet are connected to the filter chamber via flanges.

[0008] Furthermore, the filter cartridge is inclined, with the side of the filter cartridge closest to the air inlet and air outlet higher than the other side.

[0009] Furthermore, the filter cartridge has an inclination angle of 0°-5°.

[0010] Furthermore, the filter bag is made of polypropylene cloth.

[0011] Furthermore, the filter bag has a pore size of 55-65 micrometers and a thickness of 2.5-3.5 millimeters when the air pressure is 0.3-0.4 MPa.

[0012] The beneficial effects of this utility model are as follows:

[0013] (1) The air inlet and outlet of this utility model are fixed along the radial direction of the filter chamber. Therefore, the two ends of the filter chamber do not need to be adaptively narrowed and can maintain the same cylinder diameter as the middle section, which makes it convenient to open the end caps at the ends to replace the filter bags.

[0014] (2) The filter chamber of this utility model is designed with a filter bag wrapped by a filter cylinder. The rigid filter cylinder provides support for the filter bag and expands the filter bag to the maximum extent to improve the filtration efficiency of the filter bag.

[0015] (3) This utility model sets rotatable end caps at both ends of the filter chamber and fixes the filter cylinder on the end caps. The motor drives the end caps to rotate, thereby driving the filter cylinder and filter bag to rotate. This avoids the filter bag near the air inlet from accumulating dust and clogging. On the one hand, the filter bag can be fully utilized. On the other hand, some of the accumulated dust and impurities can be shaken off by rotating. At the same time, the filter cylinder is set at a certain tilt angle so that the accumulated dust and impurities gather at the end away from the air inlet and outlet due to gravity, further improving the efficiency of the filter bag and thus improving work efficiency.

[0016] (4) At the same time, the second exhaust valve on the exhaust port is connected to the automatic detection device to detect the impurity content of the filtered gas. The automatic detection device, the intake valve, the rotary motor and the control system are connected. When the impurity content is too high, the opening of the intake valve can be reduced and the speed of the rotary motor can be increased to improve the filtration effect and realize automated and efficient impurity removal filtration.

[0017] (5) A first exhaust port is provided at the bottom of the filter chamber. Before opening the end cover to replace the filter bag, the first exhaust port can be opened to exhaust the air to avoid safety issues and ensure safe disassembly.

[0018] This invention discloses a CO2 gas purification system that effectively filters impurities from the gas during the continuous carbon decomposition production of fine alumina, thereby significantly reducing defects that enter the slurry with the gas. The CO2 gas purification system has a simple structure and is easy to install and maintain. Production testing showed that using the system disclosed in this invention reduced defects in the slurry by 20.2% and increased slurry whiteness by 1.03%. Attached Figure Description

[0019] The embodiments of this utility model will be further described below with reference to the accompanying drawings, wherein:

[0020] Figure 1 A schematic diagram of the structure of this utility model is shown;

[0021] Figure 2 A front view of the first end cap or the second end cap of this utility model is shown;

[0022] Figure 3 A side view of the first end cap or the second end cap of this utility model is shown.

[0023] Among them, 1: air inlet, 2: air inlet valve, 3: filter chamber, 4: first end cover, 5: second end cover, 6: filter cartridge, 7: filter bag, 8: air outlet, 9: first exhaust valve, 10: second exhaust valve, 41: circular cover plate, 42: connecting structure, 43: annular protrusion. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0025] In one embodiment, a CO2 gas purification system includes a cylindrical inlet 1, a cylindrical filter chamber 3, and a cylindrical outlet 8. The inlet 1 and outlet 8 are symmetrically connected to the two sides of the filter chamber 3 perpendicular to the axial direction. The inlet 1 and outlet 8 are connected to the filter chamber 3 via flanges. A first end cover 4 is rotatably connected to one side of the filter chamber 3, and a second end cover 5 is rotatably connected to the other side. The first end cover 4 and the second end cover 5 include a circular cover plate 41 and a hollow cylindrical connecting structure 42. The outer side of the connecting structure 42 has multiple retractable annular protrusions 43. The inner sides of both ends of the filter chamber 3 have grooves that match the annular protrusions. The outer diameter of the connecting structure matches the inner diameter of the filter chamber 3. An inlet valve 2 is provided in the inlet 1. The filter chamber 3 is located away from the outlet. One end of the filter 8 is equipped with a first exhaust valve 9, which is located on the same horizontal line as the outlet 8. A second exhaust valve 10 is installed on the outlet 8. A rigid filter cartridge 6 is installed inside the filter chamber 3. The outer diameter of the filter cartridge 6 is smaller than the diameter of the hollow part of the connecting structure. Therefore, both ends of the filter cartridge 6 are fixed to the cover plates of the first end cover and the second end cover, respectively, and are located inside the hollow part of the connecting structure. The filter cartridge 6 is inclined at an angle of 5°. The side of the filter cartridge 6 closest to the inlet 1 and the outlet 8 is higher than the other side (i.e., the right side is higher than the left side in the attached figure). A flexible filter bag 7 is fixed to the inner wall of the filter cartridge 6. The material is polypropylene cloth. The filter pores of the filter cartridge 6 are larger than the filter pores of the filter bag 7. When the air pressure is 0.3-0.4MPa, the pore size of the filter bag 7 is 60 micrometers and the thickness is 3 millimeters. The first end cover 4 and the second end cover 5 are connected to a rotary motor. The second exhaust valve 10 is connected to an automatic detection device. The automatic detection device, the inlet valve 2, the rotary motor and the control system are connected.

[0026] The inlet valve regulates the amount of CO2 gas entering the system. The gas passes through the filter cartridge and filter bag, effectively filtering impurities and reducing defects that may enter the slurry with the gas. The first end cap 4 and the second end cap 5 are sealed during system operation. When replacing the filter bag, the inlet valve should be closed first, then the first end cap 4 or the second end cap 5 should be opened. The annular protrusion on the outer surface of the connecting structure of the first end cap 4 or the second end cap 5 can extend or retract, allowing it to seal both ends of the filter chamber and fit into the grooves at both ends. It also allows axial rotation along the grooves, driving the filter cartridge and filter bag to rotate. The filter cartridge and filter bag are tightly joined together. The first exhaust valve is used to detect the presence of CO2 gas in the filter chamber and to vent residual CO2 gas when replacing the filter bag, ensuring safety. Its function also includes daily drainage to prevent moisture from the CO2 gas from accumulating in the cleaning port and affecting the filter bag's lifespan.

[0027] Connect the second exhaust valve 10 on the air outlet 8 to an automatic detection device to detect the impurity content of the filtered gas. At the same time, connect the automatic detection device 10, the air inlet valve 2, the rotary motor and the control system. When the impurity content is too high, the opening of the air inlet valve can be reduced and the speed of the rotary motor can be increased to improve the filtration effect and achieve automated and efficient impurity removal filtration.

[0028] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] The foregoing description describes some exemplary embodiments of this utility model. It is understood that the above embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model. The features in these embodiments can be recombine in a suitable manner, and the resulting solutions are still within the scope of protection claimed by this utility model. Based on the above embodiments, all other embodiments obtained by those skilled in the art without inventive effort, that is, all modifications, equivalent substitutions, and improvements made within the spirit and principles of this application, fall within the scope of protection claimed by this utility model.

Claims

1. A CO2 gas impurity removal purification system characterized by, include: A cylindrical air inlet (1), a cylindrical filter chamber (3), and a cylindrical air outlet (8) are provided. The air inlet (1) and the air outlet (8) are symmetrically connected to the filter chamber (3) on both sides perpendicular to the axial direction. A first end cap (4) is rotatably connected to one side of the filter chamber (3), and a second end cap (5) is rotatably connected to the other side. The first end cap (4) and the second end cap (5) include a circular cover plate (41) and a hollow cylindrical connecting structure (42). The connecting structure (42) has multiple retractable annular protrusions (43) on its outer side. The filter chamber (3) has grooves on the inner sides of both ends that match the annular protrusions. The outer diameter of the connecting structure matches the inner diameter of the filter chamber (3). The air inlet (1) An air inlet valve (2) is provided in the filter chamber (3); a first exhaust valve (9) is provided at the end of the filter chamber (3) away from the air outlet (8), and a second exhaust valve (10) is provided on the air outlet (8); a rigid filter cylinder (6) and a flexible filter bag (7) are provided in the filter chamber (3), the two ends of the filter cylinder (6) are fixed to the first end cover and the second end cover respectively, the flexible filter bag (7) is fixed to the inner wall of the filter cylinder (6), the filter holes of the filter cylinder (6) are larger than the filter holes of the filter bag (7), the first end cover (4) and the second end cover (5) are connected to a rotary motor, the second exhaust valve (10) is connected to an automatic detection device, and the automatic detection device, the air inlet valve (2), the rotary motor and the control system are connected.

2. The CO2 gas impurity removal and purification system according to claim 1, characterized in that, The first exhaust valve (9) and the air outlet (8) are located on the same horizontal line.

3. The CO2 gas impurity removal and purification system according to claim 1, characterized in that, The air inlet (1) and air outlet (8) are connected to the filter chamber (3) via flanges.

4. The CO2 gas impurity removal and purification system according to claim 1, characterized in that, The filter cartridge (6) is inclined, with the side of the filter cartridge (6) closer to the air inlet (1) and the air outlet (8) higher than the other side.

5. A CO2 gas purification system according to claim 4, characterized in that, The filter cartridge (6) has an inclination angle of 0°-5°.

6. The CO2 gas impurity removal and purification system according to claim 1, wherein, The filter bag (7) is made of polypropylene cloth.

7. The CO2 gas impurity removal and purification system according to claim 1, wherein, The filter bag (7) has a pore size of 55-65 micrometers and a thickness of 2.5-3.5 millimeters when the air pressure is 0.3-0.4 MPa.

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