Automatic sampling and returning system for online detection of pulverized coal pipeline

Abstract

The application discloses an automatic sampling and returning system for online detection of a pulverized coal pipeline, and belongs to the technical field of analysis and measurement. The automatic sampling and returning system comprises a sampling pipeline, a returning pipeline, a gas returning pipeline and a cyclone separator. A sampling valve and a jet pump are arranged on the sampling pipeline, a returning valve is arranged on the returning pipeline, and a gas returning valve and a gas returning pump are arranged on the gas returning pipeline. A sampling plate and a supporting plate are sequentially arranged at the lower end of the cyclone separator, a coal taking opening and a through hole are respectively arranged on the sampling plate and the supporting plate, a pulverized coal online detection device is arranged above the supporting plate, and the coal taking opening moves between the through hole and the pulverized coal online detection device. The sampling plate is in sealed contact with the cyclone separator and the supporting plate. The automatic sampling and returning avoid pollution and safety hazards caused by sample leakage, avoid waste, the sampling does not affect the solid-gas two-phase fluid of the pulverized coal pipeline, the pulverized coal sample is subjected to online real-time detection on site, and time cost and labor cost are saved.

Description

Technical Field

[0001] This invention relates to the field of analytical measurement technology, and in particular to an automatic sampling and return system for online inspection of pulverized coal pipelines. Background Technology

[0002] Coal is a crucial component of my country's industrial energy structure, widely used across various industries. It is a primary energy source for thermal power generation and cement production, and a key raw material for the coal chemical industry. Accurate data on coal (calorific value) consumption by various industries and energy-consuming enterprises is essential for formulating national energy strategies and serves as the foundation for calculating and verifying corporate carbon emissions. To ensure that government departments can accurately grasp my country's coal consumption, the National Development and Reform Commission and the State Administration for Quality Supervision, Inspection and Quarantine jointly formulated and issued the "Work Plan for Promoting the Construction of Online Energy Consumption Monitoring Systems for Key Energy-Consuming Units" in 2017.

[0003] Coal consumption is one aspect of energy consumption, and online measurement of coal consumption is particularly complex. An online coal consumption measurement system requires real-time sampling of coal powder in the coal powder pipeline and real-time measurement of indicators such as ash content, volatile matter, and moisture content.

[0004] Traditional coal-fired boilers in thermal power plants and cement plants generally use pulverized coal suspension combustion. Therefore, the fineness of the pulverized coal entering the boiler is a routine monitoring item, requiring the collection and testing of pulverized coal samples from the pulverized coal pipeline to monitor the operation of the boiler's pulverized coal system. Currently, sampling is typically performed using a sampling head and associated extraction devices, a gas-powder separation device, a sample collection bottle, and necessary pipeline valves. During sampling, the sampling head is inserted into the pulverized coal pipeline, the obtained pulverized coal sample enters the sample collection bottle, and then the sample collection bottle is removed and tested in a laboratory.

[0005] The method of taking samples from pulverized coal pipelines using a sampling head has the following disadvantages:

[0006] 1. Coal pulverizer pipelines contain a solid-gas two-phase fluid. Sampling heads (or sampling guns, sampling tubes, etc.) need to be inserted into the pipeline to collect coal samples, which affects the solid-gas two-phase fluid. However, in online coal consumption measurement systems, the actual volume of combusted coal pulverizer needs to be measured in real time through the solid-gas two-phase flow. The influence of the sampling head on the solid-gas two-phase fluid will lead to inaccurate coal pulverizer volume measurements. Therefore, the sampling method using sampling heads is not suitable for online coal consumption measurement systems.

[0007] 2. The obtained coal powder samples need to be sent to the laboratory for testing. This measurement is not performed in real time, and the timeliness of the test results is insufficient. However, the coal consumption online measurement system needs to measure the coal powder indicators in real time. Therefore, the sampling method of the sampling head cannot meet the real-time requirements of the coal consumption online measurement system.

[0008] 3. After the coal powder in the sample collection bottle is tested in the laboratory, it is generally discarded and not returned to the coal powder pipeline. Improper handling may cause leakage, resulting in pollution and safety hazards, and will also cause waste. Summary of the Invention

[0009] To address the aforementioned technical problems, this invention provides an automatic sampling and return system for online inspection of pulverized coal pipelines. This invention automatically samples and returns samples, avoiding pollution and safety hazards caused by sample leakage, preventing waste, and ensuring that the sampling does not affect the solid-gas two-phase fluid in the pulverized coal pipeline. It enables on-site, real-time online inspection of pulverized coal samples, saving time and labor costs.

[0010] The technical solution provided by this invention is as follows:

[0011] An automatic sampling and return system for online inspection of pulverized coal pipelines includes a sampling pipeline, a return pipeline, and a return gas pipeline installed on the pulverized coal pipeline, wherein:

[0012] The inlet of the sampling pipeline is connected to the pulverized coal pipeline, and the outlet of the sampling pipeline is connected to the inlet of the cyclone separator. A sampling valve and a jet pump are sequentially installed on the sampling pipeline from the inlet to the outlet. The jet pump is equipped with an air inlet.

[0013] A sampling and detection mechanism is provided at the lower end of the solid particulate matter outlet of the cyclone separator. The sampling and detection mechanism includes a support plate and a sampling plate that is closely attached to the upper surface of the support plate. An online coal powder detection device is provided above the support plate. A coal sampling port is provided on the sampling plate. A through hole is provided on the support plate directly below the solid particulate matter outlet of the cyclone separator. The sampling plate can move horizontally relative to the support plate. The coal sampling port can move between directly above the through hole and below the online coal powder detection device.

[0014] The solid particulate outlet of the cyclone separator is in sealed contact with the upper surface of the sampling plate, the lower surface of the sampling plate is in sealed contact with the upper surface of the support plate, the inlet of the return pipe is in sealed connection with the lower surface of the support plate, the outlet of the return pipe is connected to the pulverized coal pipe, and a return valve is provided on the return pipe.

[0015] The inlet of the return gas pipeline is connected to the gas outlet of the cyclone separator, and the outlet of the return gas pipeline is connected to the pulverized coal pipeline. The return gas pipeline is equipped with a return gas valve and a return gas pump.

[0016] Furthermore, the support plate is provided with a linear slide rail, the sampling plate is installed on the linear slide rail, the sampling plate is connected to a linear power device, and the online coal powder detection device is located above the translational trajectory of the coal intake port.

[0017] Furthermore, the sampling plate is mounted on the support plate via a rotary bearing, the sampling plate is connected to a rotary power device, and the online coal powder detection device is located above the rotation trajectory of the coal intake port.

[0018] Furthermore, there are multiple coal extraction ports, which are distributed along a fixed radius of the rotation center.

[0019] Furthermore, the solid particulate outlet of the cyclone separator is in sealed contact with the upper surface of the sampling plate through a first soft sealing ring and a first hard sealing ring, wherein the first soft sealing ring is located above the first hard sealing ring and the first soft sealing ring is in a compressed state;

[0020] The lower surface of the sampling plate and the upper surface of the support plate are in sealed contact through a second soft sealing ring and a second hard sealing ring. The second soft sealing ring is located below the second hard sealing ring and is in a compressed state.

[0021] The inlet of the return pipeline is sealed to the lower surface of the support plate by a sealing ring.

[0022] Furthermore, the cross-sections of the first soft sealing ring and the second soft sealing ring are both circular, while the cross-sections of the first hard sealing ring and the second hard sealing ring are both rectangular.

[0023] Furthermore, a safety pipeline is provided between the cyclone separator and the pulverized coal pipeline, and a safety valve is installed on the safety pipeline.

[0024] Furthermore, the return gas valve and the return gas pump are sequentially arranged from the inlet to the outlet on the return gas pipeline, the inlet of the safety pipeline is connected to the cyclone separator, and the outlet of the safety pipeline is connected to the return gas pipeline between the return gas pump and the pulverized coal pipeline.

[0025] Furthermore, the return sampling pipeline, the sampling pipeline, and the return gas pipeline are arranged sequentially from bottom to top on the pulverized coal pipeline along the pulverized coal conveying direction.

[0026] Furthermore, the online coal powder detection device includes an online X-ray monitoring device and / or an online infrared detection device.

[0027] The present invention has the following beneficial effects:

[0028] This invention automatically samples coal powder from inside the coal powder pipeline, automatically completes online real-time detection, and automatically returns the detected coal powder to the pipeline, preventing any coal powder from remaining outside the system. This invention achieves both sampling and sample return, avoiding sample leakage that could cause pollution and safety hazards, and preventing waste. Furthermore, no device extends into the coal powder pipeline, so it does not affect the solid-gas two-phase fluid flow, making it particularly suitable for sampling and detection in online coal consumption measurement systems. This invention performs on-site online real-time detection of the sampled coal powder, saving time and labor costs and meeting the real-time requirements of online coal consumption measurement systems. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the automatic sampling and re-sampling system for online detection of pulverized coal pipelines according to the present invention;

[0030] Figure 2 This is a schematic diagram of a sampling and testing facility, example one.

[0031] Figure 3 This is a schematic diagram of the sampling plate in Example 1;

[0032] Figure 4 This is a schematic diagram of Example 2 of a sampling and testing facility;

[0033] Figure 5 This is a schematic diagram of the sampling plate in Example 2;

[0034] Figure 6 This is a schematic diagram of the installation and sealing structure between the sampling plate, support plate, cyclone separator, and return pipeline. Detailed Implementation

[0035] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0036] This invention provides an automatic sampling and resampling system for online inspection of pulverized coal pipelines, such as... Figure 1-6 As shown, it includes a sampling pipeline 2, a return sampling pipeline 3, and a return gas pipeline 4 installed on the pulverized coal pipeline 1, wherein:

[0037] The inlet of sampling pipeline 2 is connected to pulverized coal pipeline 1, and the outlet of sampling pipeline 2 is connected to the inlet of cyclone separator 5. Sampling valve 6 and jet pump 7 are installed sequentially from the inlet to the outlet on sampling pipeline 2. Jet pump 7 has an air inlet 8. The air inlet 8 of jet pump 7 is connected to the gas source at the working site, and the outlet of jet pump 7 is connected to the gas inlet of cyclone separator 5.

[0038] A sampling and detection mechanism 9 is provided at the lower end of the solid particulate matter outlet of the cyclone separator 5. The sampling and detection mechanism 9 includes a support plate 10 and a sampling plate 11 that is closely attached to the upper surface of the support plate 10. The support plate 10 and the sampling plate 11 are perpendicular to the solid particulate matter outlet of the cyclone separator 5 and the inlet of the return sample pipeline 3.

[0039] A coal powder online detection device 12 is installed above the support plate 10, and a coal intake port 13 is installed on the sampling plate 11. A through hole 14 is provided on the support plate 10 directly below the solid particulate matter outlet of the cyclone separator 5. The sampling plate 11 can move horizontally relative to the support plate 10, and the coal intake port 13 moves between directly above the through hole 14 and below the coal powder online detection device 12. That is, the sampling plate 11 moves horizontally perpendicular to the return pipe, and the coal powder online detection device 12 is installed in the direction of movement.

[0040] The solid particulate outlet of the cyclone separator 5 is in sealed contact with the upper surface of the sampling plate 11, the lower surface of the sampling plate 11 is in sealed contact with the upper surface of the support plate 10, the inlet of the return pipe 3 is in sealed connection with the lower surface of the support plate 10, the outlet of the return pipe 3 is connected to the pulverized coal pipe 1, and a return valve 15 is installed on the return pipe 3.

[0041] A short section of pipe can also be installed at the lower end of the cyclone separator 5, spaced a distance from the return sampling pipe 3, to facilitate the installation of the sampling plate 11 and the support plate 10. The sampling plate 11 is a flat plate with an opening (i.e., a coal intake 13, which is a through hole) matching the inner diameter of the return sampling pipe, and is inserted laterally into the aforementioned spaced-out section. During sampling, the coal intake 13 of the sampling plate 11 is filled with coal powder, which is carried out by the moving sampling plate 11 to the online coal powder detection device for detection.

[0042] The support plate 10 is also a flat plate, providing support and constraint for the sampling plate 11. The support plate 10 also has through holes 14 matching the inner diameter of the return sampling pipeline, and it is tightly fitted below the sampling plate 11. The support plate 10 is designed to be larger than the sampling plate 11 to ensure that the coal intake port 13 on the sampling plate 11 does not move outside the support plate 10 during horizontal movement. In this way, the coal dust inside the coal intake port 13 of the sampling plate 11 can be carried out by the sampling plate 11 to the online coal dust detection device or returned to its original position.

[0043] During installation, the coal intake port 13 of the sampling plate 11 is positioned concentrically with the return sampling pipeline in its initial state. The support plate 10 is fixed together with the return sampling pipeline, and the through hole of the support plate 10 is also concentric with the return sampling pipeline. At this time, although the sampling plate 11 and the support plate 10 are inserted between the return sampling pipeline and the cyclone separator, the return sampling pipeline and the cyclone separator are still complete and interconnected due to the openings on the sampling plate 11 and the support plate 10. The sampling plate 11 is moved horizontally on the support plate 10 by an electric drive device, which moves the coal powder in the coal intake port 13 of the sampling plate 11 to various detection positions or back to the initial position.

[0044] The inlet of the return gas pipeline 4 is connected to the gas outlet at the upper end of the cyclone separator 5, and the outlet of the return gas pipeline 4 is connected to the pulverized coal pipeline 1. The return gas pipeline 4 is equipped with a return gas valve 16 and a return gas pump 17.

[0045] The aforementioned sampling valve, return valve, return gas valve, return gas pump, jet pump, etc., all use known electric valves connected to control circuits to control the opening and closing of each valve and pump.

[0046] The working process of this invention is as follows:

[0047] 1. Sampling process:

[0048] With sampling plate 11 in its initial position, sampling valve 6 and return gas valve 16 are opened, return gas pump 17 is opened, and return sampling valve 15 is closed. Simultaneously, air is introduced through the air source at the inlet 8 of jet pump 7. The pressure of the air source is greater than the pressure inside the pulverized coal pipeline 1. At this time, jet pump 7 draws the solid-gas two-phase pulverized coal gas mixture from the pulverized coal pipeline 1 and sends it to cyclone separator 5. The solid-gas two-phase pulverized coal gas mixture is separated into gas (inevitably, fine pulverized coal particles are also mixed in the gas. This is related to the separation efficiency of cyclone separator 5) and solid pulverized coal particles in cyclone separator 5. The gas (and the unseparated pulverized coal particles) enters the return gas pipeline 4 from the gas outlet end of cyclone separator 5 and is pumped back into pulverized coal pipeline 1 by return gas pump 17. Solid pulverized coal particles fall downwards due to gravity into the solid particle outlet at the lower end of cyclone separator 5 and then enter the return sampling pipeline 3 through sampling and detection mechanism 9. At this time, because the return valve 15 is closed, coal powder accumulates in the pipeline between the return valve 15 and the cyclone separator 5.

[0049] After a certain period of accumulation, when the pipeline between the return sampling valve 15 and the cyclone separator 5 is filled with coal powder, the air intake port 8 is stopped, and the sampling valve 6, the return air valve 16, and the return air pump 17 are closed. At this time, the coal intake port 13 of the sampling plate 11 is also filled with coal powder, just like the return sampling pipeline 3, and the sampling process is completed.

[0050] 2. Sampling and testing process:

[0051] The power unit controls the movement of the sampling plate 11. When the coal powder in the coal inlet 13 on the sampling plate 11 reaches the detection position of the online coal powder detection device, the movement stops for online detection. After the detection is completed, the sampling plate 11 is driven back to its initial position. The principle of this process is to intercept a section of coal powder from the return sampling pipeline, move it out of the pipeline for detection, and then return it after the detection is completed.

[0052] 3. Sample return process:

[0053] Open the return sampling valve 15 and simultaneously control the air inlet 8 to allow air in. Since the sampling valve 6 is closed at this time, the jet pump 7 cannot extract the solid-gas two-phase coal powder mixture from the coal powder pipeline 1; it merely functions as an air pump. The pressurized gas entering the sampling pipeline through the air inlet 8 will pump the coal powder accumulated in the return sampling pipeline through the return sampling valve 15 into the coal powder pipeline 1. Once the coal powder in the pipeline has been blown out, stop supplying air to the air inlet 8 and then close the return sampling valve 15. This completes the entire automatic sampling and return sampling process.

[0054] This invention automatically samples coal powder from inside the coal powder pipeline, automatically completes online real-time detection, and automatically returns the detected coal powder to the pipeline, preventing any coal powder from remaining outside the system. This invention achieves both sampling and sample return, avoiding sample leakage that could cause pollution and safety hazards, and preventing waste. Furthermore, no device extends into the coal powder pipeline, so it does not affect the solid-gas two-phase fluid flow, making it particularly suitable for sampling and detection in online coal consumption measurement systems. This invention performs on-site online real-time detection of the sampled coal powder, saving time and labor costs and meeting the real-time requirements of online coal consumption measurement systems.

[0055] This invention is particularly suitable for sampling and testing in online coal consumption measurement systems. Of course, it can also be applied to sampling and testing in conventional monitoring projects such as thermal power plants.

[0056] This invention does not limit the specific implementation of the sampling and detection mechanism 9, as long as the sampling plate can move horizontally on the support plate. Two examples are given below for illustration.

[0057] Example 1:

[0058] like Figure 1 , 2 As shown in Figures 3 and 6, a linear slide rail 18 is provided on the support plate 10, a sampling plate 11 is installed on the linear slide rail 18, the sampling plate 11 is connected to a linear power device, and the online coal powder detection device 12 is located above the translation trajectory of the coal intake port 13.

[0059] The aforementioned linear power device can be a linear motor, cylinder, etc., driven by known electricity and controlled by a control circuit. The linear slide rail 18 provides support and restriction for the translation of the sampling plate 11. Driven by the linear power device, the sampling plate 11 reciprocates linearly on the support plate 10, and the movement trajectory of the coal intake port 13 is a straight line.

[0060] In this example, the sampling plate 11 is preferably a rectangular plate, and the coal intake port 13 is located at one end of the rectangular plate.

[0061] Example 2:

[0062] like Figure 4 , 5 As shown, the sampling plate 11 is mounted on the support plate 10 via a rotary bearing 19. The sampling plate 11 is connected to a rotary power device, and the online coal powder detection device 12 is located above the rotation trajectory of the coal intake port 13.

[0063] The aforementioned rotary power device can be a rotary motor or the like, driven by known electricity and controlled by a control circuit. Driven by the rotary power device, the sampling plate 11 rotates on the support plate 10, and the movement trajectory of the coal intake port 13 is circular.

[0064] In this example, the sampling plate 11 is preferably a circular plate, and the coal intake 13 is located on the circular plate and at a certain radius from the center of rotation.

[0065] In this example, there can be one or more coal intake ports 13. When there are multiple coal intake ports 13, they are distributed along a fixed radius along the rotation center. During installation, ensure that one coal intake port is directly opposite the lower end of the cyclone separator 5.

[0066] In this example, the online coal powder detection device is arranged on the rotation trajectory of the coal intake port and corresponds to other coal intake ports when the circular sampling plate is sampling. This ensures that when coal powder is being taken, the coal powder obtained in the previous batch can be detected, thus improving work efficiency.

[0067] The sampling plate of this invention moves horizontally, and it is necessary to maintain a seal between the upper and lower surfaces of the sampling plate and the lower end of the cyclone separator and the upper surface of the support plate, respectively, throughout the movement. To achieve a better sealing effect, such as... Figure 6 As shown, the solid particulate outlet of the cyclone separator 5 is in sealed contact with the upper surface of the sampling plate 11 through the first soft sealing ring 20 and the first hard sealing ring 21. The first soft sealing ring 20 is located above the first hard sealing ring 21 and is in a compressed state.

[0068] The first hard sealing ring 21 contacts the upper surface of the sampling plate 11, and the compressed first soft sealing ring 20 is pressed tightly against the upper surface of the sampling plate 11. This ensures a seal, and when the sliding contact surface of the first hard sealing ring is worn, the compressed first soft sealing ring 20 can elastically recover and expand, providing compensation to ensure the sealing effect.

[0069] The lower surface of the sampling plate 11 is in sealed contact with the upper surface of the support plate 10 through the second soft sealing ring 22 and the second hard sealing ring 23. The second soft sealing ring 22 is located below the second hard sealing ring 23 and is in a compressed state.

[0070] The sealing principle of the second soft sealing ring 22 and the second hard sealing ring 23 is the same as that of the first soft sealing ring 20 and the first hard sealing ring 21.

[0071] This invention does not limit the specific structural form of the aforementioned sealing rings. Preferably, the cross-section of the first soft sealing ring 20 and the second soft sealing ring 22 are both circular, i.e., O-rings. The cross-section of the first hard sealing ring 21 and the second hard sealing ring 23 are both rectangular, i.e., annular sealing rings. The rectangular cross-section allows the first hard sealing ring 21 and the second hard sealing ring 23 to contact the sampling plate through a plane, resulting in a better sealing effect.

[0072] The first soft sealing ring 20 and the first hard sealing ring 21 are located inside the flange at the solid particulate outlet of the cyclone separator 5 (or inside the flange on a short section of pipe below the solid particulate outlet of the cyclone separator 5), and the second soft sealing ring 22 and the second hard sealing ring 23 are located in the groove on the upper surface of the through hole 14 of the support plate 10.

[0073] The inlet of the return sample line 3 is sealed to the lower surface of the support plate 10 by a sealing ring 24. Since there is no relative movement between the lower surface of the support plate 10 and the return sample line, a standard sealing ring 24 can be used to provide a seal on the flange at the top of the lower return sample line. This sealing ring 24 is preferably an O-ring.

[0074] The present invention provides a safety pipeline 25 between the cyclone separator 5 and the pulverized coal pipeline 1, and a safety valve 26 is provided on the safety pipeline 25.

[0075] During normal operation, safety valve 26 is closed and does not activate, thus not affecting the normal operation process. Safety valve 26 only opens to release pressure and eliminate safety hazards when pipeline blockage leads to excessively high pressure within the pipeline, especially during sample return, exceeding the preset safety limit. This ensures the safe operation of the system.

[0076] The aforementioned return gas valve 16 and return gas pump 17 are sequentially arranged from the inlet to the outlet on the return gas pipeline 4. The inlet of the safety pipeline 25 is connected to the cyclone separator 5, and the outlet of the safety pipeline 25 is connected to the return gas pipeline 4 between the return gas pump 17 and the pulverized coal pipeline 1.

[0077] The present invention does not limit the position of the return sampling pipeline, the sampling pipeline and the return gas pipeline on the pulverized coal pipeline. Preferably, the return sampling pipeline 3, the sampling pipeline 2 and the return gas pipeline 4 are arranged sequentially from bottom to top on the pulverized coal pipeline 1 along the pulverized coal conveying direction.

[0078] The aforementioned online coal powder detection device 12 can be of any form, and in one example, it includes an online X-ray monitoring device 27 and / or an online infrared detection device 28.

[0079] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An automatic sampling and resampling system for online inspection of pulverized coal pipelines, characterized in that, This includes sampling pipelines, return sampling pipelines, and return gas pipelines installed on the pulverized coal pipeline, without any devices extending into the pulverized coal pipeline, wherein: The inlet of the sampling pipeline is connected to the pulverized coal pipeline, and the outlet of the sampling pipeline is connected to the inlet of the cyclone separator. A sampling valve and a jet pump are sequentially installed on the sampling pipeline from the inlet to the outlet. The jet pump is equipped with an air inlet. A sampling and detection mechanism is provided at the lower end of the solid particulate matter outlet of the cyclone separator. The sampling and detection mechanism includes a support plate and a sampling plate that is closely attached to the upper surface of the support plate. An online coal powder detection device is provided above the support plate. A coal sampling port is provided on the sampling plate. A through hole is provided on the support plate directly below the solid particulate matter outlet of the cyclone separator. The sampling plate can move horizontally relative to the support plate. The coal sampling port can move between directly above the through hole and below the online coal powder detection device. The solid particulate outlet of the cyclone separator is in sealed contact with the upper surface of the sampling plate, the lower surface of the sampling plate is in sealed contact with the upper surface of the support plate, the inlet of the return pipe is in sealed connection with the lower surface of the support plate, the outlet of the return pipe is connected to the pulverized coal pipe, and a return valve is provided on the return pipe. The inlet of the return gas pipeline is connected to the gas outlet of the cyclone separator, and the outlet of the return gas pipeline is connected to the pulverized coal pipeline. The return gas pipeline is equipped with a return gas valve and a return gas pump. A safety pipeline is provided between the cyclone separator and the pulverized coal pipeline, and a safety valve is installed on the safety pipeline; The return gas valve and the return gas pump are arranged sequentially from the inlet to the outlet on the return gas pipeline. The inlet of the safety pipeline is connected to the cyclone separator, and the outlet of the safety pipeline is connected to the return gas pipeline between the return gas pump and the pulverized coal pipeline. The sampling plate is mounted on the support plate via a rotary bearing, and the sampling plate is connected to a rotary power device. The online coal powder detection device is located above the rotation trajectory of the coal intake port. The number of coal extraction ports is multiple, and these ports are distributed along a fixed radius along the center of rotation.

2. The automatic sampling and re-sampling system for online detection of pulverized coal pipelines according to claim 1, characterized in that, The solid particulate outlet of the cyclone separator is in sealed contact with the upper surface of the sampling plate through a first soft sealing ring and a first hard sealing ring. The first soft sealing ring is located above the first hard sealing ring and is in a compressed state. The lower surface of the sampling plate and the upper surface of the support plate are in sealed contact through a second soft sealing ring and a second hard sealing ring. The second soft sealing ring is located below the second hard sealing ring and is in a compressed state. The inlet of the return pipeline is sealed to the lower surface of the support plate by a sealing ring.

3. The automatic sampling and re-sampling system for online detection of pulverized coal pipelines according to claim 2, characterized in that, The first soft sealing ring and the second soft sealing ring both have circular cross-sections, while the first hard sealing ring and the second hard sealing ring both have rectangular cross-sections.

4. The automatic sampling and re-sampling system for online detection of pulverized coal pipelines according to claim 2, characterized in that, The return sampling pipeline, the sampling pipeline, and the return gas pipeline are arranged sequentially from bottom to top on the pulverized coal pipeline along the pulverized coal conveying direction.

5. The automatic sampling and re-sampling system for online detection of pulverized coal pipelines according to claim 4, characterized in that, The online coal powder detection device includes an online X-ray monitoring device and / or an online infrared detection device.

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