Multi-channel coal quality characteristic on-line detection device for coal powder pipe

Abstract

The utility model discloses a kind of multi-channel coal quality characteristic on-line detection devices for coal powder pipe, device includes control center, sample sending mechanism and detection mechanism, sample sending mechanism includes multiple coal powder pipes, detection mechanism includes laser, spectrometer, lens assembly, optical path switch and measuring chamber, optical path switch is located between laser and measuring chamber;Lens assembly includes total reflection mirror, focusing lens group and light-receiving lens group, each optical path switch is equipped with one total reflection mirror, one focusing lens group is arranged in the side of measuring chamber, focusing lens group is between total reflection mirror and measuring chamber, light-receiving lens group is arranged in the other side of each measuring chamber, and spectrometer is connected with light-receiving lens group by optical fiber.In completion detection, control center analysis obtains test result.The utility model carries out detection to the coal powder in multiple coal powder pipes in shorter time, realizes the purpose that real-time grasps the coal quality change of multiple coal powder, effectively improves detection efficiency and reduces detection cost.

Description

Technical Field

[0001] This utility model belongs to the field of physical testing technology, specifically relating to a multi-channel online coal quality characteristic testing device for pulverized coal pipes. Background Technology

[0002] Pulverized coal testing is a core component in ensuring pulverized coal combustion efficiency and safe production. Coal quality analysis of the coal fed into the furnace is a complex and systematic task, including elemental analysis such as carbon, hydrogen, oxygen, nitrogen, and sulfur, as well as industrial analysis such as moisture, volatile matter, ash content, fixed carbon, and calorific value determination. Real-time acquisition of coal quality data is a key means to achieve digital management of coal-fired power units and an important support for further improving the low-carbon, clean, flexible, and safe operation of these units.

[0003] Currently, the automation level of coal quality analysis in coal-fired power plants is low. It typically relies on manual sampling followed by offline laboratory testing. This method is time-sensitive and makes it difficult to monitor changes in coal powder characteristics in real time. More advanced methods exist, such as using a sampling system to extract coal powder and then separating it into solid and gas phases via a cyclone separator. The solid phase, consisting of coal powder, is then analyzed online using thermogravimetric analysis. Alternatively, coal powder can be compressed into tablets and analyzed using laser-induced breakdown spectroscopy (LIBS). However, both of these methods are complex and difficult to adapt to industrial environments. Furthermore, cyclone separators screen coal particles by quality, which may not meet the representativeness requirements of the analysis.

[0004] In addition, the coal powder produced by different coal mills in coal-fired power plants varies greatly in quality. Even with automated analysis devices, different analysis devices are difficult to use together, and the problem of lagging test results remains unresolved. Moreover, the overall testing cost is also high.

[0005] Based on this, this utility model proposes a novel multi-channel online coal quality characteristic detection system and method to solve the above problems. Utility Model Content

[0006] To address the aforementioned technical problems, the purpose of this utility model is to provide a multi-channel online coal quality characteristic detection device for pulverized coal pipes. This device can detect pulverized coal in multiple pulverized coal pipes in a short time, achieving real-time monitoring of changes in the quality of pulverized coal in multiple channels, effectively improving detection efficiency and reducing detection costs.

[0007] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0008] This utility model proposes a multi-channel online coal quality characteristic detection device for pulverized coal pipes, comprising:

[0009] Control center;

[0010] The sample delivery mechanism includes a compressed air source, a pressure regulating valve group, and multiple pulverized coal pipes. The compressed air source is connected to the pressure regulating valve group, which is connected to the control center.

[0011] The testing mechanism includes a laser, a spectrometer, a lens assembly, an optical path switcher, and a measuring chamber. The number of the multiple measuring chambers is the same as the number of multiple coal powder tubes, and each coal powder tube is connected to each measuring chamber. The multiple optical path switchers are arranged between the laser and the multiple measuring chambers, and each optical path switcher corresponds to a measuring chamber.

[0012] Along the optical path from which the laser beam is emitted, a plurality of optical path switchers are arranged from front to back;

[0013] The lens assembly includes a total reflection lens, a focusing lens group, and a light-collecting lens group. Each optical path switcher is equipped with a total reflection lens. Each measurement chamber has a focusing lens group on its side, which is located between the total reflection lens and the measurement chamber. Each measurement chamber also has a light-collecting lens group on its other side. The spectrometer is connected to the light-collecting lens group via an optical fiber.

[0014] The laser, the spectrometer, and the optical path switch are all connected to the control center.

[0015] Preferably, multiple total reflection mirrors are arranged in parallel to each other.

[0016] More preferably, the incident angle of the laser on each of the multiple total reflection mirrors is 45°.

[0017] Preferably, for the same measurement chamber, the light-collecting lens group is located on one side of the focusing lens group.

[0018] More preferably, the light-collecting lens group is arranged adjacent to the focusing lens group.

[0019] Preferably, a delivery pipe and a return pipe are provided between each of the pulverized coal pipes and the corresponding measuring chamber, wherein a sampling injector is provided on the delivery pipe, and the air inlet of the sampling injector is connected to the pressure regulating valve group.

[0020] Preferably, a first valve is provided between the pulverized coal pipe and the sampling injector, and a second valve is provided on the return pipe.

[0021] More preferably, a third valve is provided between the sampling injector and the measuring chamber.

[0022] Preferably, a return sample injector is provided at the connection between the measuring chamber and the return sample tube, and the return sample injector is connected to the pressure regulating valve group.

[0023] Preferably, the first valve, the second valve, and the third valve are all automatic valves and are all connected to the control center.

[0024] Beneficial effects:

[0025] The sampling mechanism of this invention enables multi-channel flow sampling and return, with the sampling and return channels operating in a constant flow state, effectively reducing sampling pipeline blockage. Simultaneously, the detection mechanism automatically detects coal powder in different channels. Since this invention uses laser-induced breakdown spectroscopy for coal powder detection, the detection speed is fast. Through the cooperation of multiple optical path switchers within the detection mechanism, this invention can detect coal powder in multiple coal powder tubes in a short time, achieving real-time monitoring of coal quality changes across multiple channels, effectively improving detection efficiency and reducing detection costs. Attached Figure Description

[0026] Figure 1 The diagram shown is a schematic of the testing mechanism of this utility model;

[0027] Figure 2 The diagram shows two different testing states in a testing facility.

[0028] Figure 3 The diagram shown is a schematic of the sample delivery mechanism of this utility model.

[0029] Figure label:

[0030] 1-Control Center;

[0031] 2-Testing facility, 21-Laser, 22-Spectrometer, 23-Measuring room, 24-Optical path switcher, 25-Total reflection mirror, 26-Focusing lens group, 27-Light collecting lens group, 28-Fiber optic cable, 29-Sample return ejector;

[0032] 3-Sampling mechanism, 31-Compressed air source, 32-Pressure regulating valve group, 33-Pulverized coal pipe, 34-Conveying pipe, 35-Return pipe, 36-Sampling injector, 37-First valve, 38-Third valve, 39-Second valve. Detailed Implementation

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0034] like Figure 1-3As shown, this utility model proposes a multi-channel online coal quality characteristic detection device for pulverized coal pipelines, including a control center 1, a sample delivery mechanism 3, and a detection mechanism 2. The control center 1 is connected to both the sample delivery mechanism 3 and the detection mechanism 2. After the detection is completed, the control center 1 analyzes and obtains the test results. The sample delivery mechanism 3 is connected to the detection mechanism 2 to realize automatic sample delivery and automatic detection. The technical solution of this utility model is described in detail below with specific structural features.

[0035] The structure of testing unit 2 is as follows Figure 1 As shown, the detection mechanism 2 includes a laser 21, a spectrometer 22, a lens assembly, an optical path switcher 24, and a measurement chamber 23. Multiple measurement chambers 23 are connected to the sample delivery mechanism 3. Multiple optical path switchers 24 are arranged between the laser 21 and the multiple measurement chambers 23, and each optical path switcher 24 corresponds to a measurement chamber 23.

[0036] Along the optical path from the laser 21, multiple optical path switchers 24 are arranged from front to back. The lens assembly includes a total reflection lens 25, a focusing lens group 26, and a light-collecting lens group 27. Each optical path switcher 24 is equipped with a total reflection lens 25. A focusing lens group 26 is located on the side of each measurement chamber 23, positioned between the total reflection lens 25 and the measurement chamber 23. A light-collecting lens group 27 is also located on the other side of each measurement chamber 23. A spectrometer 22 is connected to the light-collecting lens group 27 via an optical fiber 28. The laser 21, spectrometer 22, and optical path switchers 24 are all connected to the control center 1. To avoid external interference, the measurement chamber, except for the location of the light-collecting lens group 27, is non-transparent. For example, the measurement chamber may be made of metal, with a location for the light-collecting lens group 27, while the rest blocks external light.

[0037] like Figure 1-2 As shown, for the same measuring chamber 23, the light-collecting lens group 27 is located on one side of the focusing lens group 26. Preferably, the light-collecting lens group 27 is adjacent to the focusing lens group 26. The light-collecting lens group 27 does not overlap with the focusing lens group 26 or is not located on the opposite side of the focusing lens group 26 to avoid direct laser irradiation.

[0038] The control center 1 of this invention is a conventional computer or other equipment that can issue commands and process experimental data, which will not be described in detail below.

[0039] The function of the optical path switcher 24 is to change the position of the total reflection mirror 25. Position 1 is defined as the position of the total reflection mirror 25 on the optical path switcher 24 when it enters the optical path from which the laser is emitted, and position 0 is defined as the position of the total reflection mirror 25 on the optical path switcher 24 when it leaves the optical path. It is easy to understand that for multiple optical path switches 24 with the total reflection mirror 25 in position 1, only the total reflection mirror 25 in the optical path switcher 24 at the very front can reflect the laser. Therefore, the optical path switcher 24 corresponding to the coal dust measuring chamber 23 needs to control the total reflection mirror 25 to enter the laser optical path, and at this time, the total reflection mirror 25 is located at the very front in the laser optical path. The positions of the other total reflection mirrors 25 located behind this total reflection mirror 25 are not restricted.

[0040] Based on the above-mentioned multi-channel online coal quality characteristic detection system, this utility model also proposes a multi-channel online coal quality characteristic detection method, as follows:

[0041] S1. The sample delivery mechanism 3 delivers coal powder to all measuring chambers 23 in the testing mechanism 2, and a coal powder flow stream is formed in each measuring chamber 23.

[0042] S2. The optical path switcher 24 corresponding to the measurement chamber 23 that needs to be tested controls the total reflection mirror 25 to enter the laser optical path, and the other total reflection mirrors 25 in front of the total reflection mirror 25 to leave the laser optical path.

[0043] S3. Laser 21 emits a laser beam, which is reflected and focused by focusing lens group 26 onto the coal powder stream in the center of the corresponding measuring chamber 23. Plasma is generated at the focusing position. The plasma light signal is focused by light-receiving lens group 27 on the other side of the measuring chamber 23 onto the end face of optical fiber 28. The optical fiber 28 transmits the light signal to spectrometer 22 for photoelectric conversion. The data converted by spectrometer 22 is transmitted to control center 1 for data analysis to obtain coal quality characteristic data of coal powder in the corresponding measuring chamber 23.

[0044] S4. After completing step S3, if it is necessary to continue detecting coal dust in other measuring chambers 23, repeat steps S2-S3; if it is not necessary to detect coal dust anymore, all total reflection mirrors 25 leave the laser optical path and the detection mechanism 2 stops detecting.

[0045] by Figure 2Taking the three optical path switchers 24 as an example, the corresponding measurement chambers 23 are channels A, B, and C, respectively. When the total reflection mirrors 25 of the three optical path switchers 24 are all in position 1, only the total reflection mirror 25 located in front and closest to the laser 21 will reflect the laser. At this time, the measurement state is in channel A. After reflection, the laser is focused by the focusing lens group 26 onto the coal powder stream in the center of the corresponding measurement chamber A. Plasma is generated at the focusing position. The plasma light signal is focused by the light receiving lens group 27 on the other side of the measurement chamber 23 onto the end face of the optical fiber 28. The optical fiber 28 transmits the light signal to the spectrometer 22 for photoelectric conversion. The data after conversion by the spectrometer 22 is transmitted to the control center 1 for data analysis, and finally the coal quality characteristics data of the coal powder in the corresponding measurement chamber A are obtained. When it is necessary to measure the coal powder and coal quality characteristics in channel B, the optical path switcher 24 corresponding to channel A switches the total reflection mirror 25 to position 0. This total reflection mirror 25 leaves the laser optical path, and the total reflection mirror 25 corresponding to channel B is now within the laser optical path, allowing for the detection of coal powder in channel B. Similarly, when it is necessary to measure the coal powder and coal quality characteristics in channel C, the total reflection mirrors 25 corresponding to channels A and B both leave the laser optical path.

[0046] This invention can detect coal dust in a single measuring chamber 23, or it can perform cyclic detection, sequentially measuring the coal quality characteristics of coal dust in multiple measuring chambers 23. The cyclic detection method can be varied. For example, along the laser beam path, the optical path switcher 24 can be controlled from front to back, causing multiple total reflection mirrors 25 to enter or leave the optical path in a regular manner. After completing the coal dust detection in the last measuring chamber 23, the detection can be performed again in the order from front to back in the first measuring chamber 23. Alternatively, after completing the coal dust detection in the last measuring chamber 23, multiple measuring chambers 23 can be directly detected in the order from back to front.

[0047] by Figure 1 Taking the three optical path switchers 24 as an example, one cycle can be in the order of ABC to detect coal dust in measurement chambers A, B, and C in sequence. After the coal dust detection in measurement chamber C is completed, the total reflection mirrors 25 corresponding to measurement chambers A and B re-enter the optical path and are detected again in the order from front to back. Alternatively, one cycle can be in the order of ABCBA to detect coal dust in measurement chambers A, B, and C in sequence. After the coal dust detection in measurement chamber C is completed in the order of ABC, the total reflection mirror 25 corresponding to measurement chamber B enters the optical path to detect coal dust in measurement chamber B again. Then, the total reflection mirror 25 corresponding to measurement chamber A enters the optical path to detect coal dust in measurement chamber A again.

[0048] In this invention, the incident angle of the laser beam into the total internal reflection mirror 25 can be different. Since the laser beam needs to be focused into the corresponding measuring chamber 23 after reflection, the arrangement of the total internal reflection mirror 25 is related to the arrangement position of the measuring chamber 23. Preferably, the multiple total internal reflection mirrors 25 are arranged parallel to each other, and the incident angle of the laser beam on the multiple total internal reflection mirrors 25 can be acute or right angle. More preferably, the incident angle of the laser beam on the multiple total internal reflection mirrors 25 is 45°.

[0049] In this invention, the optical path switcher 24 changes the position of the total reflection mirror 25. This invention does not impose specific limitations on the structure of the optical path switcher 24. For example, the optical path switcher 24 can be a lead screw device, and the total reflection mirror 25 is mounted on the lead screw device. The lead screw device controls the linear movement of the total reflection mirror 25.

[0050] The structure of sample delivery mechanism 3 is as follows Figure 3 As shown, the sampling mechanism 3 includes a compressed air source 31, a pressure regulating valve group 32, and a pulverized coal pipe 33. The compressed air source 31 is connected to the pressure regulating valve group 32, which is connected to the control center 1. The number of pulverized coal pipes 33 is the same as that of the measuring chambers 23, and each pulverized coal pipe 33 is connected to the corresponding measuring chamber 23 by a conveying pipe 34 and a return pipe 35. The pulverized coal particles output from the pulverized coal pipe 33 enter the corresponding measuring chamber 23 along the conveying pipe 34, and the pulverized coal particles in the measuring chamber 23 return to the pulverized coal pipe 33 along the return pipe 35. A sampling injector 36 is installed on the conveying pipe 34, and the air inlet of the sampling injector 36 is connected to the pressure regulating valve group 32. The compressed air source 31 is generally independently controlled, which is easy to understand. However, the compressed air source 31 can also be controlled by the control center 1, and can be set according to the actual situation.

[0051] Compressed air source 31 inputs compressed air into sampling injector 36 through pressure regulating valve group 32, creating negative pressure in sampling injector 36, which extracts coal powder particles from coal powder pipe 33 and inputs them into measuring chamber 23 along conveying pipe 34. Since coal powder pipe 33, conveying pipe 34, measuring chamber 23 and return pipe 35 form a connected pipeline, high-pressure air drives coal powder particles to move along this path. After the test is completed, the coal powder particles return to coal powder pipe 33.

[0052] Figure 3 In this context, A', B', and C' refer to three pulverized coal pipes 33, and the pulverized coal pipes A', B', and C' correspond one-to-one with the measuring chambers A, B, and C.

[0053] It is easy to understand that, in order to prevent sampling interference, the connection between the return pipe 35 and the pulverized coal pipe 33 is located downstream of the connection between the sampling pipe and the pulverized coal pipe 33, along the flow direction of the pulverized coal inside the pulverized coal pipe 33.

[0054] Furthermore, a first valve 37 is provided between the pulverized coal pipe 33 and the sampling injector 36, a third valve 38 is provided between the sampling injector 36 and the measuring chamber 23, and a second valve 39 is provided on the return pipe 35. In this invention, the pulverized coal pipe 33 maintains a state of conveying pulverized coal, and the first valve 37, the second valve 39, and the third valve 38 are open, allowing the pulverized coal to enter the detection mechanism 2. It is easy to understand that closing the first valve 37 and the second valve 39 can isolate the pulverized coal pipe 33 from the measuring chamber 23.

[0055] It is easy to understand that the opening and closing status of the valves on each pulverized coal pipe 33 is related to the detection requirements. The pulverized coal pipe 33 is in a state of maintaining the flow of pulverized coal. When it is necessary to detect the pulverized coal in one of the pulverized coal pipes 33, the first valve 37, the third valve 38 and the second valve 39 corresponding to that pulverized coal pipe 33 are opened, so that the pulverized coal in that pulverized coal pipe 33 is input into the corresponding measuring chamber 23.

[0056] Combination Figure 3 It can be seen that, based on the valves installed on the conveying pipe 34 and the return pipe 35, the conveying mechanism has the following functions:

[0057] If one of the pulverized coal pipes 33 is in a suspended pulverized coal supply state, close the first valve 37 and the second valve 39 to disconnect the pulverized coal pipe 33 from the detection mechanism 2. It should be noted that the pulverized coal pipe 33 normally supplies pulverized coal to the detection device 2 for sampling, and generally will not stop supplying pulverized coal due to channel switching within the detection mechanism 2. This operating state allows the pulverized coal in the pulverized coal pipe 33 to flow continuously, helping to prevent blockage. However, in certain special circumstances, the pulverized coal pipe 33 may stop supplying pulverized coal, such as when combustion control requires stopping the supply. In this case, the corresponding pulverized coal pipe 33 also needs to stop sampling. There are multiple pulverized coal pipes 33; the first valve 37 and the second valve 39 corresponding to one or more of the pulverized coal pipes 33 can be closed, while the remaining pulverized coal pipes 33 remain normally connected to the detection mechanism 2.

[0058] When the delivery pipe 34 between the sampling injector 36 and the detection mechanism 2 is blocked, or the return pipe 35 is blocked, the first valve 37 is closed, the third valve 38 and the second valve 39 are opened, and high-pressure air is introduced into the sampling injector 36 to clear the delivery pipe 34.

[0059] When the delivery pipe 34 between the pulverized coal pipe 33 and the sampling injector 36 becomes blocked, close the third valve 38 and the second valve 39, open the first valve 37, and input high-pressure air into the sampling injector 36 to backflush into the pulverized coal pipe 33 to clear the blockage in that part of the delivery pipe 34.

[0060] Preferably, the first valve 37, the third valve 38, and the second valve 39 are all automatic valves, such as pneumatic ball valves or electric ball valves, and are all connected to the control center 1. The automatic valves are controlled by the control center 1.

[0061] Furthermore, a return sample injector 29 is installed at the connection between the measuring chamber 23 and the return sample tube 35, and the return sample injector 29 is connected to the pressure regulating valve assembly 32. The return sample injector 29 functions similarly to the sampling injector 36. Compressed air is introduced into the return sample injector 29, creating a negative pressure at the outlet of the measuring chamber 23, which draws out the coal powder from the measuring chamber 23 and transports it along the return sample tube 35 to the coal powder tube 33. The sampling injector 36 works in conjunction with the return sample injector 29 to allow the coal powder to enter and leave the measuring chamber 23.

[0062] The sample feeding mechanism 3 of this invention can realize multi-channel automatic sample feeding, and the detection mechanism 2 can automatically detect coal powder in different channels. Since this invention is based on the laser-induced breakdown spectroscopy method to detect coal powder, the detection speed is fast. With the cooperation of multiple optical path switchers 24 in the detection mechanism 2, this invention can detect coal powder in multiple coal powder tubes 33 in a short time, realizing the purpose of real-time monitoring of coal powder quality changes in multiple channels, effectively improving detection efficiency and reducing detection costs.

[0063] The embodiments provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A multi-channel online coal quality characteristic detection device for pulverized coal pipes, characterized in that, include: Control Center (1); The sample delivery mechanism (3) includes a compressed air source (31), a pressure regulating valve group (32), and a coal powder pipe (33). The compressed air source (31) is connected to the pressure regulating valve group (32), and the pressure regulating valve group (32) is connected to the control center (1). The testing mechanism (2) includes a laser (21), a spectrometer (22), a lens assembly, an optical path switcher (24), and a measuring chamber (23). The number of the multiple measuring chambers (23) is the same as the number of multiple coal powder tubes (33), and each coal powder tube (33) is connected to each of the measuring chambers (23). The multiple optical path switchers (24) are arranged between the laser (21) and the multiple measuring chambers (23), and the optical path switchers (24) correspond one-to-one with the measuring chambers (23). Along the optical path from which the laser beam is emitted by the laser (21), a plurality of optical path switchers (24) are arranged from front to back; The lens assembly includes a total reflection lens (25), a focusing lens group (26), and a light-collecting lens group (27). Each optical path switcher (24) is provided with a total reflection lens (25). Each measurement chamber (23) is provided with a focusing lens group (26) on one side. The focusing lens group (26) is located between the total reflection lens (25) and the measurement chamber (23). Each measurement chamber (23) is also provided with a light-collecting lens group (27) on the other side. The spectrometer (22) is connected to the light-collecting lens group (27) through an optical fiber (28). The laser (21), the spectrometer (22), and the optical path switcher (24) are all connected to the control center (1).

2. The multi-channel online coal quality characteristic detection device for pulverized coal pipes according to claim 1, characterized in that, A delivery pipe (34) and a return pipe (35) are provided between each of the pulverized coal pipes (33) and the corresponding measuring chamber (23), wherein a sampling injector (36) is provided on the delivery pipe (34), and the air inlet of the sampling injector (36) is connected to the pressure regulating valve group (32).

3. The multi-channel online coal quality characteristic detection device for pulverized coal pipes according to claim 2, characterized in that, A return sample injector (29) is provided at the connection between the measuring chamber (23) and the return sample tube (35), and the return sample injector (29) is connected to the pressure regulating valve group (32).

4. The multi-channel online coal quality characteristic detection device for pulverized coal pipes according to any one of claims 1-3, characterized in that, Multiple total reflection mirrors (25) are arranged in parallel to each other.

5. The multi-channel online coal quality characteristic detection device for pulverized coal pipes according to claim 4, characterized in that, The incident angle of the laser on multiple total reflection mirrors (25) is 45°.

6. The multi-channel online coal quality characteristic detection device for pulverized coal pipes according to any one of claims 1-3, characterized in that, For the same measurement chamber (23), the light-collecting lens group (27) is located on one side of the focusing lens group (26).

7. The multi-channel online coal quality characteristic detection device for pulverized coal pipes according to claim 6, characterized in that, The light-collecting lens group (27) is arranged adjacent to the focusing lens group (26).

8. The multi-channel online coal quality characteristic detection device for pulverized coal pipes according to claim 2 or 3, characterized in that, A first valve (37) is provided between the pulverized coal pipe (33) and the sampling injector (36), and a second valve (39) is provided on the return pipe (35).

9. The multi-channel online coal quality characteristic detection device for pulverized coal pipes according to claim 8, characterized in that, A third valve (38) is provided between the sampling injector (36) and the measuring chamber (23).

10. The multi-channel online coal quality characteristic detection device for pulverized coal pipes according to claim 9, characterized in that, The first valve (37), the second valve (39) and the third valve (38) are all automatic valves and are all connected to the control center (1).

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