Pressure relief device with double disc valves and pulverized coal lock hopper pressure relief system

Abstract

The utility model provides a pressure relief device with a double-disc valve and a pulverized coal lock hopper pressure relief system, the pressure relief device is used for being connected to a pressure relief pipeline of a pulverized coal lock hopper to convey pulverized coal mixed gas, the pressure relief device comprises the double-disc valve, a ball valve and an adjusting valve group, the double-disc valve is connected to a main pipeline of the pressure relief pipeline, and the ball valve is connected to a main pipeline of the pressure relief pipeline. The double-disc valve is used for bearing pressure on the pressure relief pipeline; the ball valve is connected to a bypass of the pressure relief pipeline so that the ball valve can be connected with the double-disc valve in parallel. And the regulating valve group is connected to the pressure relief pipeline, is far away from the pulverized coal lock hopper relative to the double-disc valve, and is used for controlling the on-off of the pressure relief pipeline. The pulverized coal lock hopper pressure relief system comprises a pulverized coal lock hopper, the pressure relief device and a gas treatment device, the pulverized coal lock hopper is communicated with the gas treatment device through a pressure relief pipeline, and the pressure relief device is connected to the pressure relief pipeline. The problem that in the prior art, opening and closing of a valve of a pressure relief device of a pulverized coal pressurized gasification system are prone to failure is solved.

Description

Technical Field

[0001] The utility model relates to the field of coal powder pressurized gasification, in particular to a pressure relief device with a double disc valve and a coal powder lock bucket pressure relief system. Background Art

[0002] Coal powder pressurized gasification technology is the current mainstream gasification technology of coal chemical industry. The coal powder lock bucket completes the pressurized gasification of coal powder through the sequential control cycle of pressure increase and pressure relief. In the prior art, the pressurized gasification process usually uses a ball valve or a single disc valve as the control valve for the coal powder lock bucket to increase and release pressure, collect and release materials. However, the valve body of the ball valve is easy to wear, and the pressure relief gas carries coal powder, so the coal powder is easy to enter the sealing surface of the spherical surface. The sealing surface entering the coal powder will cause the valve switch to be stuck or not in place, causing serious internal leakage, shortening the service life, and affecting the normal sequential control operation of the coal powder lock bucket; when the pressure difference between the front and rear is large, only a single cavity of the single disc valve is pressurized, and the valve will be pressed when opening and closing, and the valve will not open. In severe cases, it may even cause the coal powder lock bucket to be unable to collect and release materials normally, affecting the coal powder lock bucket gasification device to be forced to reduce load or stop unplanned. At the same time, the valve pressure holding for a long time will cause the valve cavity of the single disc valve to be squeezed and deformed, and the valve will leak internally, making it difficult to pressurize the coal powder lock bucket. In addition, a valve body purge gas is required for the single disc valve to purge the inside of the valve cavity when the valve is opened and closed to prevent the coal powder particle medium from remaining.

[0003] That is to say, in the prior art, the pulverized coal pressurized gasification system has the problem that the valve of the pressure relief device is prone to switch failure. Utility Model Content

[0004] The main purpose of the utility model is to provide a pressure relief device with a double disc valve and a coal powder lock bucket pressure relief system to solve the problem that the valve of the pressure relief device of the coal powder pressurized gasification system in the prior art is prone to switch failure.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a pressure relief device with a double disc valve is provided, and the pressure relief device is used to be connected to the pressure relief pipeline of the coal powder lock bucket to convey the coal powder mixed gas, and the pressure relief device includes: a double disc valve, the double disc valve is connected to the main line of the pressure relief pipeline, and the double disc valve is used to bear pressure on the pressure relief pipeline; a ball valve, the ball valve is connected to the bypass of the pressure relief pipeline so that the ball valve and the double disc valve are connected in parallel; a regulating valve group, the regulating valve group is connected to the pressure relief pipeline, the regulating valve group is far away from the coal powder lock bucket relative to the double disc valve, and the regulating valve group is used to control the on and off of the pressure relief pipeline.

[0006] Furthermore, the regulating valve group includes: a cut-off valve, which is connected to the pressure relief pipeline to control the on-off of the pressure relief pipeline; a flow control valve group, at least a part of which is connected to the pressure relief pipeline, and the flow control valve group is far away from the coal powder lock bucket relative to the cut-off valve. The flow control valve group can adjust the flow of the coal powder mixed gas in the pressure relief pipeline.

[0007] Furthermore, the flow control valve group includes a flow regulating valve, which is connected to the pressure relief pipeline to adjust the flow of the pulverized coal mixed gas in the pressure relief pipeline.

[0008] Furthermore, the flow control valve group also includes a flow monitoring meter, which is connected to the flow regulating valve to adjust the opening degree of the flow regulating valve.

[0009] Furthermore, the pressure relief pipeline is used to connect the gas processing device and the coal powder lock bucket. The pressure inside the gas processing device is lower than the pressure inside the coal powder lock bucket. The pressure relief device is located between the gas processing device and the coal powder lock bucket. The gas processing device has a gas outlet, and the flow monitoring meter is connected to the gas outlet.

[0010] Furthermore, the ball valve, the cut-off valve and the flow regulating valve are all program-controlled valves.

[0011] Furthermore, the ball valve is a ceramic ball valve.

[0012] According to another aspect of the utility model, a coal powder lock hopper pressure relief system is provided, comprising a coal powder lock hopper, the above-mentioned pressure relief device and a gas processing device, the coal powder lock hopper is connected to the gas processing device through a pressure relief pipeline, and the pressure relief device is connected to the pressure relief pipeline.

[0013] Further, the gas processing device includes one of a pressure reducing filter or an exhaust gas recovery device.

[0014] Furthermore, the pressure relief pipeline includes a pressure relief section, which is located between the pressure relief device and the gas processing device, and is used to reduce the pressure of the coal powder mixed gas in the pressure relief pipeline.

[0015] By applying the technical solution of the utility model, a pressure relief device with a double disc valve is used to be connected to the pressure relief pipeline of the coal powder lock bucket to convey the coal powder mixed gas, and the pressure relief device includes: a double disc valve, the double disc valve is connected to the main line of the pressure relief pipeline, and the double disc valve is used to bear pressure on the pressure relief pipeline; a ball valve, the ball valve is connected to the bypass of the pressure relief pipeline so that the ball valve and the double disc valve are connected in parallel; a regulating valve group, the regulating valve group is connected to the pressure relief pipeline, the regulating valve group is away from the coal powder lock bucket relative to the double disc valve, and the regulating valve group is used to control the on and off of the pressure relief pipeline.

[0016] The present application provides a pressure relief device with a double disc valve, which is used to cooperate with a coal powder lock bucket to use the double disc valve to relieve pressure on the pressure relief pipeline. The pressure relief device includes a double disc valve and a ball valve arranged in parallel. When the inside of the coal powder lock bucket is in a boosted state, the double disc valve is in a closed state before conveying the high-pressure coal powder mixed gas. At this time, the high-pressure coal powder mixed gas from the coal powder lock bucket is mainly pressurized by the double disc valve on the main line of the pressure relief pipeline. Before the double disc valve is opened, the ball valve connected in parallel with the double disc valve is opened first, which can effectively reduce the pressure difference of the pressure relief pipeline at both ends of the double disc valve, and avoid the pressure difference at both ends of the double disc valve. The pressure relief pipeline extends along the decompression direction of the high-pressure coal powder mixed gas, passes through the double disc valve, and is connected to the regulating valve group. The regulating valve group is used to control and monitor the on and off of the pressure relief pipeline, which can help operators monitor the pressure changes of the coal powder mixed gas in real time, adjust the opening degree of the regulating valve group in time and take countermeasures, thereby improving the stability and reliability of the entire pressure relief device. At the same time, when the high-pressure coal powder mixed gas passes through the open double-disc valve, part of the coal powder will remain in the valve chamber. When the double-disc valve is closed, the double-disc valve's own shearing and cleaning functions will grind and discharge the coal powder, ensuring that the valve sealing effect is getting better and better, avoiding the pressure relief device from failing to open and close normally due to coal powder particles blocking the valve or internal leakage, and even causing the gasification system to be forced to reduce load or shut down unplanned. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 A structural schematic diagram of a coal powder lock bucket pressure relief system of an optional embodiment of the utility model is shown.

[0019] The above drawings include the following reference numerals:

[0020] 10. Coal powder lock bucket; 11. Coal powder mixed gas; 20. Pressure relief pipeline; 21. Double disc valve; 22. Ball valve; 30. Regulating valve group; 31. Shut-off valve; 32. Flow control valve group; 33. Flow regulating valve; 34. Flow monitoring meter; 40. Gas processing device; 43. Gas outlet. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0023] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0024] In order to solve the problem that the valve of the pressure relief device of the coal powder pressurized gasification system in the prior art is prone to switch failure, the utility model provides a pressure relief device with a double disc valve and a coal powder lock bucket pressure relief system.

[0025] like Figure 1 As shown, the pressure relief device with a double disc valve is used to be connected to the pressure relief pipeline 20 of the coal powder lock bucket 10 to convey the coal powder mixed gas 11. The pressure relief device includes a double disc valve 21, a ball valve 22 and a regulating valve group 30. The double disc valve 21 is connected to the main line of the pressure relief pipeline 20, and the double disc valve 21 is used to bear pressure on the pressure relief pipeline 20; the ball valve 22 is connected to the bypass of the pressure relief pipeline 20 so that the ball valve 22 and the double disc valve 21 are connected in parallel; the regulating valve group 30 is connected to the pressure relief pipeline 20, and the regulating valve group 30 is away from the coal powder lock bucket 10 relative to the double disc valve 21, and the regulating valve group 30 is used to control the on and off of the pressure relief pipeline 20.

[0026] The present application provides a pressure relief device with a double disc valve, which is used to cooperate with the coal powder lock bucket 10 to use the double disc valve 21 on the pressure relief pipeline 20 to relieve pressure. The pressure relief device includes a double disc valve 21 and a ball valve 22 arranged in parallel. When the inside of the coal powder lock bucket 10 is in a boosted state, the double disc valve 21 is in a closed state before conveying the high-pressure coal powder mixed gas 11. At this time, the high-pressure coal powder mixed gas 11 from the coal powder lock bucket 10 is mainly pressurized by the double disc valve 21 on the main line of the pressure relief pipeline 20. Before the double disc valve 21 is opened, the ball valve 22 connected in parallel with the double disc valve 21 is opened first, which can effectively reduce the pressure difference of the pressure relief pipeline 20 at both ends of the double disc valve 21, and avoid the valve damage caused by the excessive pressure difference at both ends of the double disc valve 21. Extending along the decompression direction of the high-pressure coal powder mixed gas 11, after passing through the double disc valve 21, the pressure relief pipeline 20 is connected to the regulating valve group 30. The regulating valve group 30 is used to control and monitor the on and off of the pressure relief pipeline 20, which can help the operator to monitor the pressure change of the coal powder mixed gas 11 in real time, adjust the opening degree of the regulating valve group 30 in time and take countermeasures, thereby improving the stability and reliability of the entire pressure relief device. At the same time, when the high-pressure coal powder mixed gas 11 passes through the double disc valve 21 that is being opened, part of the coal powder will remain in the valve cavity, and when the double disc valve 21 is closed, the double disc valve 21's own shearing and cleaning functions will grind and discharge the coal powder, ensuring that the valve sealing effect is getting better and better, avoiding the failure of the pressure relief device due to the clogging of the valve by coal powder particles and the inability to open and close normally or internal leakage, and even causing the gasification system to be forced to reduce load or unplanned shutdown.

[0027] like Figure 1 As shown, the regulating valve group 30 includes a cut-off valve 31 and a flow control valve group 32. The cut-off valve 31 is connected to the pressure relief pipeline 20 to control the on and off of the pressure relief pipeline 20; at least a part of the flow control valve group 32 is connected to the pressure relief pipeline 20, and the flow control valve group 32 is far away from the coal powder lock bucket 10 relative to the cut-off valve 31. The flow control valve group 32 can adjust the flow of the coal powder mixed gas 11 in the pressure relief pipeline 20. That is, the regulating valve group 30 is composed of the cut-off valve 31 and the flow control valve group 32. Extending along the decompression direction of the high-pressure coal powder mixed gas 11, after passing through the pressure relief device, the pressure relief pipeline 20 is provided with a cut-off valve 31, which is responsible for the complete opening or closing of the pressure relief pipeline 20 to ensure the smooth flow of the pressure relief pipeline 20. Extending along the decompression direction of the high-pressure coal powder mixed gas 11, after passing through the cut-off valve 31, the pressure relief pipeline 20 is provided with a flow control valve group 32, which can adjust the flow of the coal powder mixed gas 11 in the pressure relief pipeline 20.

[0028] like Figure 1As shown, the flow control valve group 32 includes a flow regulating valve 33, and the flow regulating valve 33 is connected to the pressure relief pipeline 20 to adjust the flow of the coal powder mixed gas 11 in the pressure relief pipeline 20. In other words, the flow regulating valve 33 can monitor the pressure change of the pressure relief device in real time. When the coal powder lock bucket is depressurized, the flow regulating valve 33 and the cut-off valve 31 are opened in sequence, and the flow regulating valve 33 adjusts the flow rate according to the initial fixed valve position, and then opens the ball valve 22 of the bypass in sequence, and finally opens the double disc valve 21 of the main road. By setting the flow regulating valve 33, the state of the pressure relief device can be observed in real time, and timely adjustments and countermeasures can be made, thereby improving the stability and reliability of the entire pressure relief device.

[0029] like Figure 1 As shown, the flow control valve group 32 also includes a flow monitoring meter 34, and the flow monitoring meter 34 is connected to the flow regulating valve 33 to adjust the opening degree of the flow regulating valve 33. That is to say, the flow control valve group 32 includes the flow regulating valve 33 and the flow monitoring meter 34, extending along the decompression direction of the high-pressure pulverized coal mixed gas 11, and the flow monitoring meter 34 is connected to the flow regulating valve 33 after the cut-off valve 31. The flow monitoring meter 34 can intelligently control the flow through monitoring data to achieve the purpose of improving efficiency or reducing losses, and can also effectively prevent the pressure change of the pressure relief device caused by abnormal flow of the pulverized coal mixed gas 11 in the pressure relief pipeline 20, thereby avoiding possible equipment damage or safety accidents.

[0030] like Figure 1 As shown, the pressure relief pipeline 20 is used to connect the gas processing device 40 and the coal powder lock hopper 10. The pressure in the gas processing device 40 is lower than the pressure in the coal powder lock hopper 10. The pressure relief device is located between the gas processing device 40 and the coal powder lock hopper 10. The gas processing device 40 has a gas outlet 43, and the flow monitoring meter 34 is connected to the gas outlet 43. In other words, the two ends of the pressure relief pipeline 20 are respectively connected to the coal powder lock hopper 10 and the gas processing device. The pressure relief device works between the gas processing device 40 and the coal powder lock hopper 10. After continuous pressure reduction, at least a part of the pressure of the high-pressure coal powder mixed gas 11 in the coal powder lock hopper 10 is released and enters the gas processing device 40. Therefore, the pressure of the coal powder mixed gas 11 received by the gas processing device 40 is lower than the pressure in the coal powder lock hopper 10. Among them, the flow monitoring meter 34 is connected to the gas outlet 43 of the gas processing device 40. The flow monitoring meter 34 directly reflects the flow of the coal powder mixed gas 11 located at the gas outlet 43, which is conducive to timely feedback and adjustment by the operator.

[0031] like Figure 1As shown, the ball valve 22, the shut-off valve 31 and the flow regulating valve 33 are all program-controlled valves. That is to say, the valves in the pressure relief device, the ball valve 22, the shut-off valve 31 and the flow regulating valve 33, are all remotely controlled, which greatly improves the intelligent control of the device and improves the safety of the coal powder gasification device. At the same time, the pressure relief device is mainly borne by the double disc valve 21, and the program-controlled valves at both ends of the gas treatment device 40 are not borne by pressure, so that coal powder will not enter the sealing surface, which can extend the service life of various valves.

[0032] like Figure 1 As shown, the ball valve 22 is a ceramic ball valve. That is, the ball valve 22 is made of wear-resistant ceramic, which greatly reduces the loss of the ball valve 22 during the coal pulverization gasification process.

[0033] The present application also provides a coal powder lock hopper pressure relief system, including a coal powder lock hopper 10, the above-mentioned pressure relief device and a gas processing device 40, the coal powder lock hopper 10 and the gas processing device 40 are connected through a pressure relief pipeline 20, and the pressure relief device is connected to the pressure relief pipeline 20. In other words, the coal powder lock hopper pressure relief system is composed of the coal powder lock hopper 10, the pressure relief device and the gas processing device 40, which can safely and stably realize the pressure relief process of the coal powder lock hopper 10, which is conducive to maintaining the long-term stable operation of the coal powder pressurized gasification system.

[0034] Optionally, the gas processing device 40 includes a pressure reducing filter or an exhaust gas recovery device. That is, the gas processing device 40 may be configured as a pressure reducing filter, which can effectively remove impurities in the pulverized coal mixed gas 11, ensure the cleanliness of the gas, and avoid the waste of clean resources. It may also be configured as an exhaust gas recovery device, which can reduce the emission of harmful gases from the pulverized coal mixed gas 11, reduce pollution to the environment, and improve resource utilization.

[0035] like Figure 1 As shown, the pressure relief pipeline 20 includes a pressure relief section, which is located between the pressure relief device and the gas processing device 40, and is used to reduce the pressure of the coal powder mixed gas 11 in the pressure relief pipeline 20. In other words, the pressure relief pipeline 20 itself has a pressure relief section for pressure relief, which is located between the pressure relief device and the gas processing device 40. By increasing the diameter of the pipeline from small to large to expand the flow space, the pressure of the coal powder mixed gas 11 is reduced, thereby ensuring the stability of the coal powder lock bucket pressure relief system.

[0036] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0037] 1. When the inside of the pulverized coal lock bucket 10 is in a boosted state, the double disc valve 21 is in a closed state before conveying the high-pressure pulverized coal mixed gas 11. At this time, the high-pressure pulverized coal mixed gas 11 from the pulverized coal lock bucket 10 is mainly pressurized by the double disc valve 21 on the main line of the pressure relief pipeline 20. Before the double disc valve 21 is opened, the ball valve 22 connected in parallel with the double disc valve 21 is opened first, which can effectively reduce the pressure difference of the pressure relief pipeline 20 at both ends of the double disc valve 21, and avoid the valve damage caused by the excessive pressure difference at both ends of the double disc valve 21.

[0038] 2. When the high-pressure coal powder mixed gas 11 passes through the double disc valve 21 that is being opened, part of the coal powder will remain in the valve cavity. When the double disc valve 21 is closed, the shearing and cleaning functions of the double disc valve 21 will grind and discharge the coal powder, ensuring that the valve sealing effect is getting better and better.

[0039] 3. Extending along the decompression direction of the high-pressure pulverized coal mixed gas 11, after passing through the double disc valve 21, the pressure relief pipeline 20 is connected to the regulating valve group 30. The regulating valve group 30 is used to control and monitor the on-off of the pressure relief pipeline 20, which can help the operator to monitor the pressure changes of the pulverized coal mixed gas 11 in real time, adjust the opening degree of the regulating valve group 30 in time and take corresponding measures, thereby improving the stability and reliability of the entire pressure relief device.

[0040] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0043] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A pressure relief device with a double disc valve, characterized in that: The pressure relief device is used to be connected to a pressure relief pipeline (20) of a coal powder lock hopper (10) to convey coal powder mixed gas (11), and the pressure relief device comprises: A double disc valve (21), the double disc valve (21) being connected to a main line of the pressure relief pipeline (20), the double disc valve (21) being used to bear pressure on the pressure relief pipeline (20); a ball valve (22), the ball valve (22) being connected to a bypass of the pressure relief pipeline (20) so that the ball valve (22) is connected in parallel with the double disc valve (21); A regulating valve group (30), the regulating valve group (30) is connected to the pressure relief pipeline (20), the regulating valve group (30) is away from the coal powder lock bucket (10) relative to the double disc valve (21), and the regulating valve group (30) is used to control the on and off of the pressure relief pipeline (20).

2. The pressure relief device according to claim 1, characterized in that: The regulating valve group (30) comprises: a cut-off valve (31), the cut-off valve (31) being connected to the pressure relief pipeline (20) to control the on-off of the pressure relief pipeline (20); A flow control valve group (32), at least a portion of which is connected to the pressure relief pipeline (20), the flow control valve group (32) is farther away from the coal powder lock bucket (10) relative to the cut-off valve (31), and the flow control valve group (32) is capable of adjusting the flow of the coal powder mixed gas (11) in the pressure relief pipeline (20).

3. The pressure relief device according to claim 2, characterized in that: The flow control valve group (32) comprises a flow regulating valve (33), and the flow regulating valve (33) is connected to the pressure relief pipeline (20) to adjust the flow of the pulverized coal mixed gas (11) in the pressure relief pipeline (20).

4. The pressure relief device according to claim 3, characterized in that: The flow control valve group (32) further comprises a flow monitoring meter (34), wherein the flow monitoring meter (34) is connected to the flow regulating valve (33) to adjust the opening degree of the flow regulating valve (33).

5. The pressure relief device according to claim 4, characterized in that: The pressure relief pipeline (20) is used to connect the gas processing device (40) and the coal powder lock bucket (10); the pressure in the gas processing device (40) is lower than the pressure in the coal powder lock bucket (10); the pressure relief device is located between the gas processing device (40) and the coal powder lock bucket (10); the gas processing device (40) has a gas outlet (43); and the flow monitoring meter (34) is connected to the gas outlet (43).

6. The pressure relief device according to claim 3, characterized in that: The ball valve (22), the cut-off valve (31) and the flow regulating valve (33) are all program-controlled valves.

7. The pressure relief device according to any one of claims 1 to 6, characterized in that: The ball valve (22) is a ceramic ball valve (22).

8. A coal powder lock bucket pressure relief system, characterized in that: It comprises a coal powder lock hopper (10), a pressure relief device as described in any one of claims 1 to 7, and a gas processing device (40), wherein the coal powder lock hopper (10) is connected to the gas processing device (40) via a pressure relief pipeline (20), and the pressure relief device is connected to the pressure relief pipeline (20).

9. The pulverized coal lock bucket pressure relief system according to claim 8, characterized in that: The gas processing device (40) comprises one of a pressure reducing filter or an exhaust gas recovery device.

10. The pulverized coal lock bucket pressure relief system according to claim 8, characterized in that: The pressure relief pipeline (20) comprises a pressure relief section, the pressure relief section is located between the pressure relief device and the gas processing device (40), and the pressure relief section is used to reduce the pressure of the coal powder mixed gas (11) in the pressure relief pipeline (20).

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