Coal powder particle size detection device and coal mill

Abstract

This disclosure relates to a pulverized coal particle size detection device and a coal mill. The pulverized coal particle size detection device includes a connecting pipe and a detection component. The connecting pipe is used to connect to the outlet pipe of the coal mill. The interior of the connecting pipe has a channel for pulverized coal to pass through, and an opening communicating with the channel is formed on the side wall of the connecting pipe. The detection component includes a particle size detection device and a sealing plate. The particle size detection device is mounted on the sealing plate, and the sealing plate detachably covers the opening. The particle size detection device is connected to the connecting pipe and is used to cover the opening, and the particle size detection device is located inside the channel. Through the above technical solution, by connecting the connecting pipe to the outlet pipe of the coal mill, the particle size detection device can directly detect the pulverized coal entering the channel of the connecting pipe. This allows for real-time acquisition of the particle size distribution of the pulverized coal entering the furnace, enabling operators to adjust the output and air volume of the coal mill in a timely manner based on real-time data, thereby achieving combustion optimization and energy saving and emission reduction.

Description

Technical Field

[0001] This disclosure relates to the field of coal powder particle size detection technology, specifically, to a coal powder particle size detection device. Background Technology

[0002] The particle size of pulverized coal in coal-fired power plants has a crucial impact on boiler combustion efficiency and pollutant emissions. Therefore, it is necessary to achieve online detection of pulverized coal particle size distribution. In related technologies, pulverized coal particle size detection in power plants mainly relies on pulverized coal sampling devices to periodically sample the pulverized coal entering the furnace at the pulverizer outlet, and then sending it to the coal quality analysis laboratory for sieving and calculation using a vibrating screen. This process is not only complex and operationally demanding, but also cannot obtain real-time information on the particle size distribution of the pulverized coal entering the furnace, making it difficult to accurately guide operators in adjusting combustion. Utility Model Content

[0003] The purpose of this disclosure is to provide a coal powder particle size detection device and a coal mill to at least partially solve the technical problems existing in the related art.

[0004] To achieve the above objectives, a first aspect of this disclosure provides a coal powder particle size detection device, comprising:

[0005] A connecting pipe is used to connect to the outlet pipe of a coal mill. The connecting pipe has an internal channel for coal powder to pass through, and an opening communicating with the channel is formed on the side wall of the connecting pipe.

[0006] The detection assembly includes a particle size detection device and a sealing plate. The particle size detection device is disposed on the sealing plate, and the sealing plate detachably covers the opening. The particle size detection device is connected to the connecting pipe and is used to cover the opening. The particle size detection device is located within the channel.

[0007] Optionally, the sealing plate includes a plate body, a first connector, and a first fastener. The first connector is connected to the outer wall of the plate body. A first through hole is formed on the first connector, extending along its own thickness direction. A second through hole is formed on the connecting tube. The first fastener is fastened to the first through hole and the second through hole.

[0008] Optionally, the plate body includes an inner plate and an outer plate, the inner plate is connected to the middle of the outer plate, the size of the inner plate is smaller than the size of the opening, the size of the outer plate is larger than the size of the opening, the inner plate is embedded in the opening, and the edge of the outer plate is fitted to the outer wall of the connecting pipe.

[0009] Optionally, the side of the inner plate closest to the channel is flush with the side wall of the channel.

[0010] Optionally, the particle size detection device includes a processor and an acoustic wave conduction sensor, the acoustic wave conduction sensor being signal-connected to the processor and disposed within the channel.

[0011] Optionally, the particle size detection device further includes an electrostatic sensor, the processor is signal-connected to the electrostatic sensor, the electrostatic sensor is located in the channel and is used to measure the static electricity carried by the coal powder particles flowing through the channel.

[0012] Optionally, the coal powder particle size detection device further includes a first flange and a second flange, wherein the first flange is fixedly connected to the first open end of the connecting pipe, and the second flange is fixedly connected to the second open end of the connecting pipe.

[0013] Optionally, the coal powder particle size detection device further includes a spare sealing plate, which is movably connected to the connecting pipe and is used to selectively cover the opening.

[0014] Optionally, the coal powder particle size detection device further includes an arc-shaped slide rail, which is axially arranged around the connecting pipe on the outer wall of the connecting pipe. The spare sealing plate is slidably connected to the arc-shaped slide rail on the side near the connecting pipe and can slide above the opening to cover the opening.

[0015] A second aspect of this disclosure provides a coal mill, including a body, an outlet pipe, and a coal powder particle size detection device as described above, wherein the coal powder outlet end of the body is connected to the outlet pipe, and the end of the outlet pipe opposite to the body is connected to the connecting pipe.

[0016] The above technical solution connects the pulverizer to the outlet pipe of the coal mill via a connecting pipe, enabling the particle size detection device to directly detect the pulverized coal entering the connecting pipe channel. This allows for real-time acquisition of the particle size distribution of the pulverized coal entering the furnace, allowing operators to adjust the pulverizer output and air supply volume based on real-time data, thereby optimizing combustion and achieving energy conservation and emission reduction.

[0017] During the testing process, since the structure of the device involved in this disclosure is relatively simple, after the connecting pipe is connected to the coal mill outlet pipe, the particle size detection device can directly perform the test in the connecting pipe channel without the need for a cumbersome sampling and sample delivery process. Therefore, the operation process can be greatly simplified and the manpower and time costs can be reduced.

[0018] Furthermore, the sealing plate of the detection component can be detachably covered to seal the opening of the connecting pipe. This design makes the installation and disassembly of the particle size detection device very convenient. During installation, simply cover the opening with the sealing plate to complete the installation of the particle size detection device; when the particle size detection device malfunctions or needs calibration or replacement, the sealing plate can be easily removed for maintenance or replacement operations without affecting the normal operation of the coal mill.

[0019] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a perspective view of a coal powder particle size detection device provided in an exemplary embodiment of the present disclosure, wherein the detection components are in a disassembled state;

[0022] Figure 2 This is a perspective view of a coal powder particle size detection device provided in an exemplary embodiment of the present disclosure, wherein the detection component is covered on the opening;

[0023] Figure 3 This is a perspective view of a coal powder particle size detection device provided in an exemplary embodiment of this disclosure from another angle;

[0024] Figure 4 This is a perspective view of a coal powder particle size detection device provided in an exemplary embodiment of the present disclosure, wherein a spare sealing plate covers the opening.

[0025] Explanation of reference numerals in the attached figures

[0026] 1-Particle size detection device for pulverized coal; 10-Connecting pipe; 100-Channel; 11-Opening; 12-Second through hole; 20-Detection component; 21-Particle size detection device; 210-Processor; 211-Acoustic wave conduction sensor; 212-Electrostatic sensor; 22-Sealing plate; 220-Plate body; 2201-Inner plate; 2202-Outer plate; 221-First connector; 2210-First through hole; 222-First fastener; 30-First flange; 40-Second flange; 50-Spare sealing plate; 51-Handle; 52-Second connector; 520-Third through hole; 53-Sealing plate body; 60-Arc-shaped slide rail. Detailed Implementation

[0027] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0028] In this disclosure, unless otherwise stated, directional terms such as "up," "down," "left," and "right" are used to indicate orientation or positional relationships only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or a specific orientation structure and operation, and therefore should not be construed as a limitation of this disclosure. The terms "inner" and "outer" refer to the inner and outer contours of the corresponding structures.

[0029] Additionally, it should be noted that the terms used, such as "first" and "second," are used to distinguish one element from another and do not indicate sequence or importance. Furthermore, in the description referring to the accompanying drawings, the same reference numerals in different drawings denote the same element.

[0030] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "connect," "link," and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0031] refer to Figures 1 to 4 As shown, the first aspect of this disclosure provides a coal powder particle size detection device 1, including a connecting pipe 10 and a detection component 20. The connecting pipe 10 is used to connect to the outlet pipe of a coal mill. The interior of the connecting pipe 10 has a channel 100 for coal powder to pass through. An opening 11 communicating with the channel 100 is formed on the side wall of the connecting pipe 10. The detection component 20 includes a particle size detection device 21 and a sealing plate 22. The particle size detection device 21 is disposed on the sealing plate 22. The sealing plate 22 detachably covers the opening 11. The particle size detection device 21 is connected to the connecting pipe 10 and is used to cover the opening 11. The particle size detection device 21 is located inside the channel 100.

[0032] Through the above technical solution, the connecting pipe 10 is connected to the coal mill outlet pipe, enabling the particle size detection device 21 to directly detect the pulverized coal entering the channel 100 of the connecting pipe 10. This allows for real-time acquisition of the particle size distribution of the pulverized coal entering the furnace, enabling operators to adjust the coal mill output and air supply in a timely manner based on real-time data, thereby achieving combustion optimization and energy conservation and emission reduction.

[0033] During the testing process, since the structure of the device involved in this disclosure is relatively simple, after the connecting pipe 10 is connected to the coal mill outlet pipe, the particle size detection device 21 directly performs the test in the channel 100 of the connecting pipe 10, without the need for a cumbersome sampling and sample delivery process. Therefore, the operation process can be greatly simplified and the manpower and time costs can be reduced.

[0034] Furthermore, the sealing plate 22 of the detection component 20 can be detachably covered by the opening 11 of the connecting pipe 10. This design makes the installation and disassembly of the particle size detection device 21 very convenient. During installation, the particle size detection device 21 can be installed simply by covering the opening 11 with the sealing plate 22. When the particle size detection device 21 malfunctions or needs to be calibrated or replaced, the sealing plate 22 can be easily removed to perform maintenance or replacement operations without affecting the normal operation of the coal mill.

[0035] Compared with related technologies, the particle size detection device 21 is located in the channel 100 of the connecting pipe 10, which can directly detect the passing coal powder. This avoids the influence of factors such as insufficient sample representativeness during the sampling process and errors in the sieving calculation process on the detection results. The direct detection method makes the detection results more realistically reflect the actual particle size distribution of the coal powder entering the furnace, reduces measurement errors, and provides more accurate data for combustion adjustment.

[0036] It should be noted that during the above detection process, the particle size detection device 21 can only detect the particle size of the coal powder flowing in the channel 100 that is close to the detection component 20, rather than detecting the particle size of all coal powder particles flowing through the channel 100. Detecting only the particle size of some coal powder particles can also comprehensively reflect the particle size distribution of the coal powder particles.

[0037] To minimize changes to the overall structure of the connecting pipe 10, the aforementioned sealing plate 22 can be formed as an arc-shaped plate, such as... Figures 1 to 2 As shown, the curvature of the arc plate is consistent with the curvature of the opening 11, so that when the sealing plate 22 covers the opening 11, it can form the channel 100 together with the connecting pipe 10.

[0038] This disclosure does not limit the specific location of the particle size detection device 21. For example, the particle size detection device 21 can be located on the side wall of the connecting pipe 10, or on the bottom wall of the connecting pipe 10. Alternatively, the particle size detection device 21 can extend to the middle of the channel 100. Or, the particle size detection device 21 can detect the coal powder flowing through the channel 100 from multiple locations. Specifically, the particle size detection device 21 can be located on the side, top, bottom, and middle of the connecting pipe 10, thereby further improving the accuracy of measuring the particle size of the coal powder.

[0039] This disclosure does not limit the specific connection relationship between the sealing plate 22 and the connecting pipe 10 mentioned above. For example, in an exemplary embodiment provided in this disclosure, the sealing plate 22 can be connected to the connecting pipe 10 by means of fasteners. Specifically, as shown in the example... Figures 1 to 2As shown, the sealing plate 22 includes a plate body 220, a first connector 221, and a first fastener 222. The first connector 221 is connected to the outer wall of the plate body 220. A first through hole 2210 is formed on the first connector 221, extending along its own thickness direction. A second through hole 12 is formed on the connecting pipe 10. The first fastener 222 is fastened to the first through hole 2210 and the second through hole 12. The sealing plate 22 is connected to the connecting pipe 10 through the first connector 221 and the first fastener 222. The first through hole 2210 on the first connector 221 and the second through hole 12 on the connecting pipe 10 cooperate, and the first fastener 222 is fastened to them, ensuring a firm connection between the sealing plate 22 and the connecting pipe 10, effectively preventing coal powder leakage, and ensuring the stability and accuracy of the detection process.

[0040] Furthermore, the fastener connection method allows for easy and quick operation when the detection component 20 needs to be disassembled, maintained, or replaced, simply by loosening the first fastener 222.

[0041] In this disclosure, the first through hole 2210 and the second through hole 12 can both be threaded holes, and the first fastener 222 can be a fastening screw.

[0042] To improve the sealing effect of the sealing plate 22 on the connecting pipe 10, such as Figures 1 to 2 As shown, there can be multiple first connectors 221. Multiple first connectors 221 are connected to the plate 220 and spaced apart. Each first connector 221 has a first through hole 2210. In this way, multiple first fasteners 222 can be used to achieve a sealed connection between the plate 220 and the connecting pipe 10 in different ways.

[0043] Alternatively, in another exemplary embodiment provided in this disclosure, the sealing plate 22 can also be connected to the connecting pipe 10 by means of snap-fit, threaded connection, etc., and this disclosure does not limit this.

[0044] Optionally, such as Figure 1 As shown, the plate 220 includes an inner plate 2201 and an outer plate 2202. The inner plate 2201 is connected to the middle of the outer plate 2202. The size of the inner plate 2201 is smaller than the size of the opening 11, and the size of the outer plate 2202 is larger than the size of the opening 11. The inner plate 2201 is embedded in the opening 11, and the edge of the outer plate 2202 is fitted against the outer wall of the connecting pipe 10. Thus, in the actual assembly process, the inner plate 2201 is filled into the opening 11, while the outer plate 2202 covers the outer periphery of the opening 11, thereby achieving a better sealing effect.

[0045] In one embodiment provided in this disclosure, the inner plate 2201 and the outer plate 2202 can be manufactured as a single piece. On the one hand, this facilitates the production of the plate 220. On the other hand, it can reduce the connection structure between the outer plate 2202 and the inner plate 2201, and make the plate 220 have higher structural strength. This avoids the problem of coal powder leakage caused by deformation or twisting of the plate 220 during the flow of coal powder particles in the channel 100 of the connecting pipe 10.

[0046] Optionally, the inner plate 2201 is flush with the side wall of the channel 100 on the side closest to the channel 100. On the one hand, since the inner plate 2201 is embedded in the opening 11, the combined action of the inner plate 2201 and the outer plate 2202 can achieve a double seal on the opening 11, further improving the sealing effect of the opening 11. On the other hand, since the inner plate 2201 is flush with the side wall of the channel 100 on the side closest to the channel 100, the arrangement of the inner plate 2201 can also avoid affecting the coal powder particles flowing in the channel 100, minimizing the impact of the sealing plate 22 on the coal powder transmission.

[0047] It should be noted that the particle size detection device 21 mentioned above can also be embedded in the sealing plate 22 and flush with the side of the sealing plate 22 near the channel 100, so that the particle size detection device 21 is flush with the inner wall of the connecting pipe 10, so as to avoid the particle size detection device 21 affecting the transmission of coal powder particles in the channel 100.

[0048] This disclosure does not limit the specific detection method and detection structure of the particle size detection device 21 described above. Coal powder particles of the same size have different effects on sound waves; smaller particles may cause greater sound wave attenuation, while larger particles may alter the propagation speed and frequency characteristics of the sound waves. Based on this, in one embodiment provided in this disclosure, such as... Figures 1 to 2 As shown, the particle size detection device 21 may include an acoustic wave transmission sensor 211, which is signal-connected to the processor 210 and is disposed within the channel 100. Thus, during the multi-functional coal powder particle separation process, the acoustic wave transmission sensor 211 disposed within the channel 100 can collect acoustic wave information of the coal powder and transmit it to the processor 210. Based on the information measured by the acoustic wave transmission sensor 211, the processor 210 can deduce the particle size by analyzing the propagation characteristics of the acoustic waves in the coal powder.

[0049] It should be noted that the particle size detection device 21 mentioned above may include multiple acoustic wave transmission sensors 211, thereby further improving the acoustic wave detection efficiency, reducing the detection dead zone, and improving the detection accuracy.

[0050] To facilitate understanding of this solution, the specific principle of the acoustic wave conduction sensor 211 in measuring the particle size of pulverized coal is explained here:

[0051] The acoustic wave conduction sensor 211 detects the particle size of pulverized coal primarily based on the fact that the propagation characteristics of sound waves in a medium containing pulverized coal particles are affected by these particles. The particle size is detected by analyzing these changes. When sound waves encounter pulverized coal particles, they change their propagation direction and scatter in various directions. The degree of scattering is related to factors such as the size, shape, and number of pulverized coal particles, as well as the frequency of the sound wave. Generally, the larger the particle size, the more significant the scattering effect on the sound wave. The pulverized coal particles absorb the energy of the sound wave and convert it into other forms of energy, such as heat. The degree of absorption is also related to the characteristics of the particles and the frequency of the sound wave.

[0052] The acoustic wave conduction sensor 211 typically consists of a transmitter and a receiver. The transmitter emits sound waves of a certain frequency and intensity into a medium containing coal powder particles, while the receiver receives the sound wave signal after it has propagated through the medium. By comparing the difference between the transmitted and received signals, changes in the sound wave propagation characteristics can be detected, mainly including the following two aspects:

[0053] Sound attenuation: Due to scattering and absorption, the energy of sound waves gradually attenuates during propagation. Different particle sizes result in different degrees of sound wave energy attenuation; larger particles lead to greater sound wave attenuation. By measuring the change in sound wave intensity before and after propagation, the sound attenuation coefficient can be obtained. This coefficient is related to the particle size and concentration of coal powder.

[0054] To determine the particle size of pulverized coal by observing changes in sound wave propagation characteristics, a quantitative model of the relationship between the two is needed. This typically requires extensive experimental research, using pulverized coal samples with known particle size distributions to measure parameters such as the attenuation coefficient and sound velocity changes at different particle sizes. Then, mathematical methods (such as regression analysis and neural networks) are used to fit the functional relationship between particle size and these parameters.

[0055] In actual testing, the acoustic wave transmission sensor 211 measures the propagation characteristics of the acoustic wave (acoustic attenuation coefficient and sound velocity, etc.) in real time. The processor 210 substitutes the measured parameters into the previously established relational model to calculate the particle size of the coal powder particles.

[0056] Sound velocity variation: The presence of coal dust particles alters the equivalent elasticity and density of the medium, thus changing the propagation speed of sound waves within it. Differences in particle size and concentration cause varying degrees of change in sound velocity. By accurately measuring the propagation time and distance of the sound waves, the sound velocity can be calculated, and the particle size information can then be analyzed. The sound wave conduction sensor 211 may include a transmitter, a receiver, and a signal processor 210. The sensor typically includes a sound wave transmitter to generate a sound wave signal, a receiver to detect changes in the sound wave after passing through the coal dust medium, and the sensor processes the received sound wave signal to analyze parameters such as propagation time, frequency change, and attenuation.

[0057] Furthermore, such as Figure 1 As shown, the particle size detection device 21 may further include a processor 210 and an electrostatic sensor 212. The processor 210 is signal-connected to the electrostatic sensor 212, which is located inside the channel 100 and is used to measure the static electricity carried by the coal powder particles flowing through the channel 100. Thus, the electrostatic sensor 212 can measure the static electricity carried by the coal powder particles flowing through the channel 100 and transmit the coal powder particle size signal carried by different coal powder particles to the processor 210. The processor 210 then analyzes the signal to calculate the particle size and particle size distribution of the coal powder. In this way, the electrostatic sensor 212 continuously measures the static electricity signal of the coal powder particles flowing through the channel 100, and the processor 210 analyzes the coal powder particle size in real time based on the static electricity signal, thereby achieving real-time measurement of the coal powder particle size within the channel 100.

[0058] To facilitate understanding of this solution, the specific principle of the electrostatic sensor 212 in measuring the particle size of pulverized coal is explained here:

[0059] When coal powder particles flow in channel 100, they will interact with the inner wall of channel 100 and other coal powder particles through friction and collision. According to the principle of triboelectricity, the atoms of different substances have different binding abilities to electrons. During the process of coal powder particles coming into contact with and separating from other object surfaces, electrons will be transferred, thereby causing the coal powder particles to become statically charged.

[0060] Generally, under the same conditions (such as the same material, movement speed, and environment), the larger the particle size of coal powder, the larger its surface area and mass. During friction and collision, it can transfer a relatively large number of electrons, thus carrying a greater charge. The electrostatic signal intensity detected by the electrostatic sensor 212 is proportional to the charge carried by the particle. By analyzing the intensity and frequency of the electrostatic signal, the particle size distribution can be estimated. Therefore, the particle size of coal powder can be measured by establishing a quantitative relationship between the electrostatic signal intensity and the coal powder particle size.

[0061] The electrical signal output by the electrostatic sensor 212 is typically a complex signal containing information about multiple particles, requiring a series of signal processing steps, such as filtering, amplification, and noise reduction, to extract useful particle size information. Then, by substituting the processed signal into the previously established mathematical model, the particle size of the coal powder can be calculated. Furthermore, the particle size distribution of the coal powder can be analyzed based on the statistical characteristics of the signal.

[0062] In this design, the electrostatic sensor 212 is installed in the internal channel 100 of the connecting pipe 10. When charged coal powder particles flow within the channel 100, an electrostatic field is generated around them. The electrostatic sensor 212 can sense changes in this electrostatic field and convert them into electrical signals (such as voltage or current signals) for output. The magnitude and characteristics of this electrical signal are related to the charge, velocity, and distribution of the coal powder particles, and can then be used to measure the flow rate and relative concentration of the coal powder particles based on analysis.

[0063] To further improve the accuracy of coal powder particle size testing, in one exemplary embodiment provided in this disclosure, the particle size detection device 21 may include multiple electrostatic sensors 212 and multiple acoustic wave conduction sensors 211, thereby further improving electrostatic detection efficiency, reducing detection dead zones, and improving detection accuracy.

[0064] In this way, with the combined action of the acoustic wave transmission sensor 211 and the electrostatic sensor 212, parameters such as the average particle size and particle size distribution of the coal powder particles can be obtained, thereby making a more accurate judgment on the state of the coal powder particles.

[0065] In addition, such as Figures 1 to 3 As shown, the processor 210 can be set outside the channel 100 and transmit the analyzed data to a computer or mobile device via wired or wireless means for operators to observe.

[0066] For the embodiment of the sealing plate 22 including the outer plate 2202 and the inner plate 2201, such as Figure 1 As shown, the electrostatic sensor 212 is mounted on the inner plate 2201.

[0067] In another embodiment provided in this disclosure, image processing technology can also be used to measure the particle size of coal powder particles. Specifically, the particle size detection device 21 may include an imaging device (such as a camera) and an image processor 210. When a photograph is taken of the coal powder particles, light shines onto the particles, and after reflection and refraction, an image of the particles is formed on the photosensitive element of the imaging device. The projected size of the particles in the image has a certain proportional relationship with the actual particle size. By analyzing and processing the image, the size of the particles in the image is measured, and then combined with the known imaging ratio (i.e., the conversion relationship between the size on the image and the actual size), the actual particle size of the coal powder particles can be calculated.

[0068] To facilitate connection with the upstream equipment (coal mill) and downstream equipment (boiler) of the connecting pipe 10, in one embodiment provided in this disclosure, such as Figures 1 to 4 As shown, the pulverized coal particle size detection device 1 also includes a first flange 30 and a second flange 40. The first flange 30 is fixedly connected to the first open end of the connecting pipe 10, and the second flange 40 is fixedly connected to the second open end of the connecting pipe 10. Thus, the first flange 30 and the second flange 40 are respectively fixedly connected to both ends of the connecting pipe 10. This flange connection method facilitates the connection of the connecting pipe 10 to the coal mill outlet pipe and other pipes, making installation and disassembly convenient, improving the versatility and scalability of the device. Furthermore, the flange connection has good sealing performance, effectively preventing pulverized coal leakage and ensuring the sealing and safety of the entire pulverized coal conveying system.

[0069] Optionally, such as Figures 3 to 4 As shown, the coal powder particle size detection device 1 may also include a spare sealing plate 50, which is movably connected to the connecting pipe 10 and is used to selectively cover the opening 11. The spare sealing plate 50 is movably connected to the connecting pipe 10 and can selectively cover the opening 11. When the particle size detection device 21 needs to be disassembled for maintenance or malfunctions, the spare sealing plate 50 can be used to cover the opening 11 to prevent coal powder leakage, ensure the normal operation of the coal mill, and play an emergency protection role.

[0070] Similarly, such as Figures 3 to 4 As shown, the spare sealing plate 50 includes a sealing plate 22 body and a second connecting member 52.

[0071] It should be noted that the shape and size of the above-mentioned spare sealing plate 50 can be set to be the same as that of the sealing plate 22. In this way, when the spare sealing plate 50 is used to seal the opening 11, the same sealing effect as that of the sealing plate 22 can be achieved.

[0072] In addition, such as Figures 3 to 4As shown, the spare sealing plate 50 can also be detachably connected to the side of the connecting pipe 10 away from the hole 11 in the same way as the sealing plate 22, without affecting the detection of the particle size detection device 21. Furthermore, it is more convenient to quickly assemble the spare sealing plate 50 when the particle size detection device 21 needs to be inspected or maintained, so that when the spare sealing plate 50 covers the opening 11, it can share the first fastener 222 of the detection device and the second through hole 12 provided on the connecting pipe 10.

[0073] Optionally, such as Figures 1 to 4 As shown, the coal powder particle size detection device 1 may further include an arc-shaped slide rail 60, which is axially arranged around the connecting pipe 10 on the outer wall of the connecting pipe 10. The spare sealing plate 50 is slidably connected to the arc-shaped slide rail 60 on the side near the connecting pipe 10 and is slidably positioned above the opening 11 to cover the opening 11. In this way, when the detection device needs to be repaired, the spare sealing plate 50 can be directly pushed, thereby driving the spare sealing plate 50 to slide along the extension direction of the arc-shaped slide rail 60 arranged circumferentially around the connecting pipe 10 until the spare sealing plate 50 is above the opening 11. At this time, the first fastener 222 of the sealing plate 22, the third through hole 520 formed on the second connector 52 on the spare sealing plate 50, and the first through hole 2210 originally formed on the first connector 221 are used to seal the spare sealing plate 50 to the connecting pipe 10.

[0074] Similarly, after the inspection of the detection component 20 is completed, the first fastener 222 can be unscrewed, and the spare sealing plate 50 can be pushed in the opposite direction to slide along the extension direction of the arc-shaped slide rail 60 arranged around the circumference of the connecting pipe 10, so that the spare sealing plate 50 returns to the spare position and is fixed in place with the fastener. Then, through the cooperation between the first fastener 222 and the first through hole 2210 and the second through hole 12, the sealing plate 22 of the detection component 20 is resealed on the opening 11, making it easier to push the spare sealing plate 50 and facilitating the operation of the operator.

[0075] To facilitate the driving operation of the aforementioned spare sealing plate 50, such as Figures 1 to 4 As shown, a handle 51 is provided on the side of the sealing plate 22 and the spare sealing plate 50 away from the connecting pipe 10. The operator can apply force to the sealing plate 22 and the spare sealing plate 50 by grasping the handle 51, so as to drive the spare sealing plate 50 to slide along the arc-shaped slide rail 60.

[0076] The second aspect of this disclosure provides a coal mill, including a body, an outlet pipe, and a coal powder particle size detection device 1 as described above. The coal powder outlet end of the body is connected to the outlet pipe, and the end of the outlet pipe facing away from the body is connected to a connecting pipe 10. The coal mill with the connecting pipe 10 can generate a continuous particle size distribution curve through real-time online detection, facilitating the analysis of the change in coal powder particle size over time and providing more comprehensive data support for combustion optimization. Furthermore, by monitoring abnormal particle size distribution in real time (such as sudden coarsening or thinning), early warnings can be given for coal mill wear or air supply system malfunctions, avoiding sudden shutdowns.

[0077] Furthermore, compared to the coal dust that may be generated during the sampling and sieving process in related technologies, the particle size detection device 21 of this device comes into contact with the coal dust particles entirely within the channel 100, which can greatly reduce pollution during the sampling process.

[0078] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0079] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0080] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A coal powder particle size detection device, characterized in that, include: A connecting pipe is used to connect to the outlet pipe of a coal mill. The connecting pipe has an internal channel for coal powder to pass through, and an opening communicating with the channel is formed on the side wall of the connecting pipe. The detection assembly includes a particle size detection device and a sealing plate. The particle size detection device is disposed on the sealing plate, and the sealing plate detachably covers the opening. The particle size detection device is connected to the connecting pipe and is used to cover the opening. The particle size detection device is located within the channel.

2. The coal powder particle size detection device according to claim 1, characterized in that, The sealing plate includes a plate body, a first connector and a first fastener. The first connector is connected to the outer wall of the plate body. A first through hole is formed on the first connector along its own thickness direction. A second through hole is formed on the connecting tube. The first fastener is fastened in the first through hole and the second through hole.

3. The coal powder particle size detection device according to claim 2, characterized in that, The plate body includes an inner plate and an outer plate. The inner plate is connected to the middle of the outer plate. The size of the inner plate is smaller than the size of the opening, and the size of the outer plate is larger than the size of the opening. The inner plate is embedded in the opening, and the edge of the outer plate is fitted to the outer wall of the connecting pipe.

4. The coal powder particle size detection device according to claim 3, characterized in that, The inner plate is flush with the side wall of the channel on the side closest to the channel.

5. The coal powder particle size detection device according to any one of claims 1-4, characterized in that, The particle size detection device includes a processor and an acoustic wave conduction sensor. The acoustic wave conduction sensor is signal-connected to the processor and is disposed within the channel.

6. The coal powder particle size detection device according to claim 5, characterized in that, The particle size detection device also includes an electrostatic sensor. The processor is signal-connected to the electrostatic sensor, which is located in the channel and is used to measure the static electricity carried by the coal powder particles flowing through the channel.

7. The coal powder particle size detection device according to any one of claims 1-4, characterized in that, The coal powder particle size detection device also includes a first flange and a second flange. The first flange is fixedly connected to the first open end of the connecting pipe, and the second flange is fixedly connected to the second open end of the connecting pipe.

8. The coal powder particle size detection device according to any one of claims 1-4, characterized in that, The coal powder particle size detection device also includes a spare sealing plate, which is movably connected to the connecting pipe and is used to selectively seal the opening.

9. The coal powder particle size detection device according to claim 8, characterized in that, The coal powder particle size detection device also includes an arc-shaped slide rail, which is axially arranged around the connecting pipe on the outer wall of the connecting pipe. The spare sealing plate is slidably connected to the arc-shaped slide rail on the side near the connecting pipe and can slide above the opening to cover the opening.

10. A coal mill, characterized in that, The device includes a body, an outlet pipe, and a coal powder particle size detection device according to any one of claims 1-9, wherein the coal powder outlet end of the body is connected to the outlet pipe, and the end of the outlet pipe opposite to the body is connected to the connecting pipe.

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