Pyrolysis gas filtering device and gas conveying pipeline using same

Abstract

The utility model belongs to chemical equipment for carbon black production, and particularly relates to a pyrolysis gas filtering device and a gas conveying pipeline using the pyrolysis gas filtering device. A traditional basket type filter used on an existing non-condensable gas conveying pipeline is inconvenient to replace and clean. The cracking gas filtering device comprises a device body which is detachably connected to a gas conveying main pipe, a gas conveying channel with a filter screen piece is arranged in the device body, and a front flange plate and a rear flange plate which can be connected with the pipeline in a locking mode through butt joint are fixed to the gas conveying main pipe. The device body is clamped and fixed on the gas transmission main pipe through the front flange plate and the rear flange plate. An inlet and an outlet of the gas transmission channel are in sealed butt joint with pipeline openings in the front flange plate and the rear flange plate respectively. The pyrolysis gas filtering device is simple in structure and convenient to disassemble and assemble, and filter screens of different specifications can be flexibly replaced according to working conditions. By using the gas conveying pipeline of the cracking gas filtering device, the cracking gas filtering device can be overhauled and replaced under the condition of not interrupting production.

Description

Technical Field

[0001] The utility model belongs to chemical equipment for the production of recycled carbon black from rubber, and particularly relates to a pyrolysis gas filtering device and a gas pipeline using the same. Background Art

[0002] In the process of pyrolyzing waste tires to produce carbon black, a high-temperature pyrolysis gas is generated. After cooling by water-cooled heat exchange, a part of it is condensed into pyrolysis oil, and the pyrolysis gas that has not been condensed at normal temperature becomes non-condensable gas. These non-condensable gases are transported through pipelines and used for combustion to provide circulating heat for the pyrolysis system or sent to a boiler for combustion power generation. There are still easily condensable oil droplets and fine dust in these non-condensable gases. After a long time, they will block precision instruments such as flow meters and regulating valves, resulting in malfunctions of the instrument operation and only being able to stop for maintenance, thus affecting the production process. At the same time, the internal structure of precision instruments such as flow meters is complex, not only is it troublesome to disassemble and repair, but also it has to be sent out for re-calibration before it can be reinstalled and used after disassembly and repair. Once it is damaged by bumping during the disassembly and installation process, it will cause great economic losses. Although a basket-type filter can be installed at the front end of the pipeline of the flow meter in the existing pipeline for transporting non-condensable gas, the oil removal effect is still not good after operation. The basket-type filter is difficult to capture oil droplets and dust in the gas, and at the same time, it is inconvenient to replace and clean the basket-type filter. Therefore, there is an urgent need for a pipeline gas filtering device with a simple structure and capable of quick disassembly and assembly to remove oil droplets and dust in the transported gas. Content of the Utility Model

[0003] To solve the technical problem that there is a lack of an effective filtering device with a simple structure on the existing pipeline for transporting non-condensable gas, the utility model provides a pyrolysis gas filtering device and a gas pipeline using the same. The pyrolysis gas filtering device has a simple structure and is convenient for disassembly and assembly. Further, different specifications of filter meshes can be flexibly replaced according to the actual working conditions; for the gas pipeline using the aforementioned pyrolysis gas filtering device, the gas transportation path can be changed by switching the main gas pipeline and the bypass pipeline, and the pyrolysis gas filtering device can be overhauled and replaced without interrupting production.

[0004] The technical solution adopted by the present utility model to solve the technical problem: A cracking gas filtering device, including a device body detachably connected to the main gas transmission pipe. A gas transmission channel with filter mesh sheets is provided inside the device body. Front and rear flange plates capable of connecting and locking the pipeline through butt-joint are fixed on the main gas transmission pipe. It is characterized in that the device body is clamped and fixed on the main gas transmission pipe through the front and rear flange plates, and the inlet and outlet of the gas transmission channel are respectively in sealed butt-joint with the pipe openings at the front and rear flange plates. The present utility model clamps the device body through the flange plates common in the pipeline, so that the device body is detachably connected to the main gas transmission pipe. The inlet and outlet of the gas transmission channel on the device body are also respectively in sealed butt-joint with the pipe openings at the corresponding front and rear flange plates, so that the gas passing through the device body is filtered to remove oil droplets and dust. At the same time, the disassembly and assembly of the device body are both fast and convenient. When disassembling, only need to unlock and loosen the front and rear flange plates, then the device body clamped by the two flange plates can be loosened and removed from the side of the main gas transmission pipe for maintenance and replacement. When it needs to be reinstalled, insert it again between the front and rear flange plates from the side of the main gas transmission pipe, and then lock the two flange plates until the device body is re-clamped. The connection and fastening of the two paired flange plates through multiple groups of flange connection bolts and flange connection nuts distributed in a circular manner are the prior art.

[0005] As a further improvement and supplement to the above technical solution, the present utility model adopts the following technical measures: The device body includes an annular seat and a filter mesh sheet detachably connected to the middle empty space of the annular seat. The middle empty space of the annular seat forms the gas transmission channel. The axis of the annular seat coincides with the axes of the front and rear flange plates. When the front and rear flange plates clamp the device body, the two end faces of the annular seat are respectively in sealed contact with the front and rear flange plates. The close contact between the annular seat and the front and rear flange plates clamps and fixes the device body between the two flange plates, and makes the middle empty space of the annular seat serve as the gas transmission channel and be in sealed butt-joint with the pipe openings at the two flange plates. During operation, the gas output from the pipe opening on one side of the front flange plate is filtered by the filter mesh sheet when passing through the middle empty space of the annular seat, and the filtered gas is input into the pipe opening on one side of the rear flange plate.

[0006] Preferably, the filter mesh sheet is detachably connected to the annular seat through an annular pressing plate. An inner concave is formed on any end face of the annular seat to form an annular step surface coaxial with the annular seat. The pressing plate is locked at the inner concave of the fixed annular seat through multiple bolts, and presses the filter mesh sheet on the step surface. Multiple installation holes are provided in a circular distribution on the pressing plate, the filter mesh sheet and the annular seat to match the bolts. The filter mesh sheet is locked by the pressing plate to fit and fix to the annular seat. The annular seat is specially provided with an inner concave to accommodate the filter mesh sheet, and the filter mesh sheet is fixed by the pressing plate fastened by bolts; corresponding installation holes are opened on the pressing plate, the filter mesh sheet and the annular seat for inserting and installing bolts. During use, filter mesh sheets with appropriate mesh numbers can be selected, cut and replaced according to the actual production working conditions to meet the requirements of the standard process filtration.

[0007] Preferably, a flexible ring gasket is provided between the filter sheet and the pressure plate, and a through hole matching the bolt is arranged around the ring gasket. By installing a flexible ring gasket between the filter sheet and the pressure plate as a buffer, it is prevented that the rigid pressure plate directly contacts the edge of the filter sheet and exerts pressure to damage the filter sheet, thereby affecting the filter sheet's ability to filter oil droplets and dust.

[0008] Preferably, the outer end surface of the pressure plate is provided with a countersunk hole matching the bolt. The function of the countersunk hole is to accommodate the large diameter cap end on one side of the bolt when the bolt locks the pressure plate in place, so as to prevent the cap end from protruding outward and contacting the flange that is pressed against the ring seat, thereby interfering with the flange clamping and fixing device body.

[0009] Preferably, the bolt is a hexagon socket bolt, which is suitable for the high pressure and high temperature environment in which the utility model works, is not easy to loosen after being tightened, and can be used interchangeably with bolts commonly used in rubber production.

[0010] Preferably, the filter sheet has a mesh size of 70 to 100. The mesh size of the filter sheet within this range can meet the production process requirements of the cracker to remove oil droplets and dust.

[0011] Preferably, the axial thickness of the ring seat is 30 mm, and the diameter of the ring seat is 140 mm. The axial thickness and diameter of the ring seat are within this size, which is thin and convenient to insert between two flanges for clamping and fixing, and the plane size can adapt to the flanges commonly used on the pipeline.

[0012] The second purpose of the invention of the utility model is to provide a gas transmission pipeline using a cracked gas filtering device, including a gas transmission main pipe and filtering devices and flow meters arranged in sequence according to the gas transmission direction, a main valve is provided on the gas transmission main pipe at the front end of the filtering device, and the filtering device is a cracked gas filtering device as described above. The gas transmission pipeline uses the aforementioned cracked gas filtering device, which is not only simple in structure and easy to assemble and disassemble, but also can flexibly replace and use filters of different specifications according to actual working conditions. When assembling and disassembling the filtering device, it is necessary to close the main valve in advance to cut off the gas supply of the gas transmission main pipe.

[0013] Preferably, a bypass pipe is connected to the gas main pipe, and the inlet and outlet ends of the bypass pipe are respectively connected to the gas main pipe at the front end of the main valve and the rear end of the flow meter, and a bypass valve is provided on the bypass pipe. By connecting a bypass pipe to the gas main pipe, an auxiliary passage that can bypass the filter device and the flow meter is separated from the gas main pipe. When the filter device needs to be repaired and replaced, the main valve is closed and the bypass valve is opened to allow the gas transmission to temporarily bypass the filter device and the flow meter, ensuring that production continues without interruption. After the repair and replacement of the filter device is completed, the bypass valve is closed and the main valve is reopened to restore the normal gas transmission through the filter device and the flow meter.

[0014] Advantageous technical effects of the present utility model: The cracking gas filtration device has a simple structure and is convenient for disassembly and assembly. Furthermore, different mesh size specifications of filter screens can be flexibly replaced according to actual working conditions; for the gas transmission pipeline using the aforementioned cracking gas filtration device, during operation, the specific gas transmission path can be changed by switching the main gas transmission pipe and the bypass pipe, enabling maintenance and replacement of the cracking gas filtration device without interrupting production. Brief Description of the Drawings

[0015] Figure 1 : Schematic diagram of the use in Embodiment 1.

[0016] Figure 2 : Schematic structural diagram of Embodiment 1.

[0017] Figure 3 : Schematic structural diagram of Embodiment 2.

[0018] In the figure: 1. Front flange, 2. Rear flange, 3. Device body, 4. Ring seat, 5. Filter screen sheet, 6. Pressure plate, 7. Bolt, 8. Flange connection bolt, 9. Flange connection nut, 10. Flowmeter, 11. Bypass pipe, 12. Main path valve, 13. Bypass valve, 14. Main gas transmission pipe, 15. Ring gasket. Detailed Embodiment

[0019] The present utility model will be further described below in conjunction with the description of the drawings and the detailed embodiment.

[0020] As Figures 1-2 shown, Embodiment 1 is a cracking gas filtration device, including a device body 3 detachably connected to the main gas transmission pipe 14. An air transmission channel with a filter screen sheet 5 is provided inside the device body 3. A front flange 1 and a rear flange 2 that can be connected and locked to communicate the pipeline are fixed on the main gas transmission pipe 14. The device body 3 is clamped and fixed on the main gas transmission pipe 14 through the front flange 1 and the rear flange 2. The inlet and outlet of the air transmission channel are hermetically docked with the pipe openings at the front flange 1 and the rear flange 2 respectively. Locking and fastening the front flange 1 and the rear flange 2 with multiple groups of flange connection bolts 8 and flange connection nuts 9 distributed around is prior art.

[0021] When disassembly is required, only by unlocking and loosening the front and rear flanges can the device body clamped by the two flanges be loosened and removed from the side of the main gas transmission pipe for maintenance and replacement. When reinstallation is needed, insert it again between the front and rear flanges from the side of the main gas transmission pipe, and then lock the two flanges until the device body is re-clamped.

[0022] The device body 3 in this embodiment includes a ring seat 4 and a filter screen 5 detachably connected to the middle gap of the ring seat 4. The axial thickness of the ring seat 4 is 30 mm, and the diameter of the ring seat 4 is 140 mm. The middle gap of the ring seat 4 forms the gas transmission channel. The axis of the ring seat 4 coincides with the axis of the front flange 1 and the rear flange 2. When the front flange 1 and the rear flange 2 clamp the device body 3, the two end faces of the ring seat 4 are sealed tightly against the front flange 1 and the rear flange 2 respectively.

[0023] The filter sheet 5 is detachably connected to the ring seat 4 via an annular pressing plate 6. An inner concave is arranged on any end face of the ring seat 4 to form an annular step surface coaxial with the ring seat 4. The pressing plate 6 is locked to the inner concave portion of the fixed ring seat 4 via a plurality of bolts 7 and presses the filter sheet 5 onto the step surface. A plurality of mounting holes distributed around the pressing plate 6, the filter sheet 5 and the ring seat 4 are provided to match the bolts 7.

[0024] In order to prevent the pressure plate from damaging the filter sheet, a flexible ring gasket 15 is provided between the filter sheet 5 and the pressure plate 6. The ring gasket in this embodiment is a rubber gasket, and a through hole matching the bolt 7 is arranged around the ring gasket 15. The outer end surface of the pressure plate 6 is also provided with a countersunk hole matching the bolt 7 to accommodate the large-diameter cap end on one side of the bolt, so as to prevent the cap end from protruding and contacting the flange that is pressed against the ring seat, thereby interfering with the flange clamping and fixing device body. The bolt 7 in this embodiment is preferably a hexagon socket bolt 7, which is suitable for the high-pressure and high-temperature working conditions of rubber production. It is not easy to loosen after tightening, and can be used with similar bolts in other production equipment. The filter sheet 5 is a filter sheet 5 with a mesh number of 70 to 100. In this embodiment, a filter sheet with a mesh number of 80 is preferably used to filter oil droplets and dust in the cracked gas.

[0025] like Figure 3 As shown, Example 2 is a gas transmission pipeline, including a gas transmission main pipe 14 and a filtering device and a flow meter 10 arranged thereon in sequence according to the gas transmission direction. A main valve 12 is provided on the gas transmission main pipe 14 at the front end of the filtering device. The filtering device is the cracked gas filtering device described in Example 1. A bypass pipe 11 is also connected to the gas transmission main pipe 14. The inlet and outlet ends of the bypass pipe 11 are respectively connected to the gas transmission main pipe 14 at the front end of the main valve 12 and the rear end of the flow meter 10. A bypass valve 13 is provided on the bypass pipe 11.

[0026] When the filter needs to be repaired or replaced, the main valve is closed and the bypass valve is opened to allow the gas transmission to temporarily bypass the filter and flow meter to ensure continuous production. After the filter is repaired and replaced, the bypass valve is closed and the main valve is reopened to restore the gas transmission through the filter and flow meter.

Claims

1. A cracking gas filtration device, comprising a device body (3) detachably connected to a main gas transmission pipe (14), wherein a gas transmission channel with filter mesh sheets (5) is arranged in the device body (3), and front and rear flange plates (1, 2) capable of connecting and locking a communicating pipeline through docking are fixed on the main gas transmission pipe (14), and the characteristics are The device body (3) is clamped and fixed on the main gas transmission pipe (14) through the front and rear flange plates (1, 2), and the inlet and outlet of the gas transmission channel are respectively sealed and butted with the pipe openings at the front and rear flange plates (1, 2).

2. The cracking gas filtration device according to claim 1, characterized in that The device body (3) includes an annular seat (4) and a filter screen (5) detachably connected to the middle void of the annular seat (4). The middle void of the annular seat (4) forms the gas transmission channel. The axis of the annular seat (4) coincides with the axes of the front and rear flange plates (1, 2). When the front and rear flange plates (1, 2) clamp the device body (3), the two end faces of the annular seat (4) are respectively sealed and closely attached to the front and rear flange plates (1, 2).

3. The cracking gas filtration device according to claim 2, characterized in that The filter screen (5) is detachably connected to the annular seat (4) through an annular pressing plate (6). An inner concave is formed on any end face of the annular seat (4) to form an annular step surface coaxial with the annular seat (4). The pressing plate (6) is locked at the inner concave of the fixed annular seat (4) through a plurality of bolts (7), and the filter screen (5) is pressed onto the step surface. A plurality of mounting holes are provided around the pressing plate (6), the filter screen (5) and the annular seat (4) and are matched with the bolts (7).

4. The cracking gas filtration device according to claim 3, characterized in that A flexible ring gasket (15) is provided between the filter screen (5) and the pressing plate (6), and through holes matching the bolts (7) are provided around the ring gasket (15).

5. The cracking gas filtration device according to claim 3, characterized in that A counterbore matching the bolts (7) is provided on the outer end face of the pressing plate (6).

6. The cracking gas filtration device according to claim 3, characterized in that The bolt (7) is an internal hexagon bolt (7).

7. The cracking gas filtration device according to claim 6, characterized in that The filter screen (5) is a filter screen (5) with a mesh number of 70 to 100 meshes.

8. The cracking gas filtration device according to claim 2, characterized in that The axial thickness of the annular seat (4) is 30 mm, and the diameter of the annular seat (4) is 140 mm.

9. A gas pipeline, comprising a main gas pipeline (14) and a filtering device and a flowmeter (10) sequentially arranged thereon in the gas transmission direction, a main pipeline valve (12) is provided on the main gas pipeline (14) at the front end of the filtering device, and the characteristics are The filtering device is the cracked gas filtering device according to any one of claims 1 to 8.

10. The gas transmission pipeline according to claim 9, wherein A bypass pipe (11) is connected to the main gas transmission pipe (14). The inlet and outlet ends of the bypass pipe (11) are respectively connected to the main gas transmission pipe (14) in front of the main road valve (12) and behind the flow meter (10). A bypass valve (13) is provided on the bypass pipe (11).

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