A simultaneous period multi-tube pulverized coal integrated sampling device

Abstract

This invention provides a simultaneous multi-pipe integrated pulverized coal sampling device, belonging to the field of pulverized coal pipe sampling technology. It can at least partially solve the problems of existing manual sampling, which cannot guarantee that the sampling gun travels at a variable speed along a constant circular curve, and cannot adjust the sampling pressure in real time according to changes in the primary air duct pressure; and the inability to obtain complete samples at the same time and in the same cross-section when using a single sampling point or step-by-step sampling mode. This invention includes a pulverized coal sampling module, a sealing module, a gas-solid separation module, and a differential pressure adjustment module. By arranging multiple sets of pulverized coal sampling components on multiple primary air pulverized coal pipes and sampling simultaneously, this invention avoids the error caused by the operating condition changes brought about by traditional pipe-by-pipe and time-by-time sampling, and makes the pulverized coal distribution data between different pipelines more comparable and representative.

Description

Technical Field

[0001] This invention belongs to the field of coal powder tube sampling technology, specifically relating to a multi-tube integrated coal powder sampling device for simultaneous sampling. Background Technology

[0002] Pulverized coal fineness is a core parameter for adjusting the combustion of power plant boilers, directly affecting combustion efficiency, pulverizing energy consumption, and equipment safety. Accurate sampling is a prerequisite for effective monitoring of pulverized coal parameters. Currently, most major thermal power units in China adopt direct-fired pulverizing systems, whose positive pressure operation significantly increases the difficulty of pulverized coal sampling.

[0003] Traditional manual sampling requires operators to manually advance the sampling device, which cannot guarantee that the sampling gun travels at varying speeds along a constant circular curve, nor can it adjust the sampling pressure in real time according to changes in the primary air duct pressure. Furthermore, most devices use a single sampling point or a step-by-step sampling mode. Horizontal linear motion sampling requires sampling at multiple locations within the pipeline sequentially, making it impossible to obtain a complete sample at the same time and cross-section. In addition, existing samplers have fixed dimensions and cannot be adapted to primary air pulverized coal ducts of different diameters, requiring frequent equipment replacements. Therefore, we propose a simultaneous multi-duct pulverized coal integrated sampling device. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art, and to provide a multi-tube integrated coal powder sampling device for simultaneous sampling.

[0005] This invention provides a multi-tube integrated coal powder sampling device for simultaneous sampling, comprising: The pulverized coal sampling module includes multiple sets of pulverized coal sampling components for sampling the conveying working medium in the primary air pulverized coal pipe; A sealing module is provided on the pulverized coal sampling assembly and is in contact with the primary air pulverized coal pipe during operation to prevent pulverized coal leakage from the primary air pulverized coal pipe using the pressure of compressed air. The gas-solid separation module includes a hose connected to each of the coal powder sampling components, a separator connected to one end of the hose, and a coal powder storage box disposed at the solid outlet of the separator; and The differential pressure regulation module includes a pressure transmission pipe that is connected to the primary air pulverized coal pipe and the pulverized coal sampling component respectively during operation, a pressure sensor connected to the pressure transmission pipe for real-time acquisition of the air pressure difference between the primary air pulverized coal pipe and the pulverized coal sampling component, a control unit electrically connected to the pressure sensor, and a pressure regulating unit that is connected to the primary air pulverized coal pipe and electrically connected to the control unit during operation.

[0006] Furthermore, the pulverized coal sampling assembly includes a telescopic sampling rod for inserting into the primary air pulverized coal pipe during operation, and a sampling nozzle disposed at one end of the telescopic sampling rod for receiving pulverized coal from the primary air pulverized coal pipe. The sampling nozzle is connected to the end of the telescopic sampling rod via a detachable structure.

[0007] Specifically, the insertion depth of the telescopic sampling rod is adjustable from 50mm to 600mm, and the diameter of the sampling nozzle is adjustable from 5mm to 20mm.

[0008] Specifically, the separator is a cyclone separator, and the powder storage box has a built-in metering module for weighing pulverized coal.

[0009] Preferably, the differential pressure regulation module further includes a differential pressure display electrically connected to the pressure sensor.

[0010] Specifically, the pressure regulating unit is a negative pressure vacuum pump.

[0011] Furthermore, the differential pressure regulating module, the separator, and the powder storage box are housed inside the housing, which is a corrosion-resistant alloy housing.

[0012] Furthermore, the sealing module is connected to a pressure monitoring unit for real-time monitoring of the compressed air pressure in the sealing module.

[0013] Furthermore, the simultaneous multi-tube coal powder integrated sampling device also includes a data acquisition and storage module electrically connected to the coal powder sampling module, the sealing module, the gas-solid separation module, and the differential pressure regulation module.

[0014] Specifically, the sealing module is a dynamic air seal pipe seat that is connected to compressed air. The sealing module is provided with an annular compressed air injection channel to form a dynamic seal between the coal powder sampling component and the sealing module by utilizing the dynamic pressure of the compressed air.

[0015] The beneficial effects of this invention are as follows: By arranging multiple sets of coal powder sampling components on multiple primary air coal powder pipes and sampling simultaneously, the error caused by the change in operating conditions brought about by traditional pipe-by-pipe and time-segmented sampling is avoided, making the coal powder distribution data between different pipelines more comparable and representative. The differential pressure regulation module sends the pressure of the primary air coal powder pipe and the coal powder sampling components to the pressure sensor through the pressure transmission pipe. The control unit adjusts the working state of the pressure regulating unit according to the real-time differential pressure, forming a closed-loop control, which can stabilize the differential pressure between the sampling channel and the original pipeline within the set range, which is conducive to ensuring near-isokinetic sampling conditions. Attached Figure Description

[0016] Figure 1This is a structural connection diagram of a multi-tube integrated coal powder sampling device for a specific embodiment of the present invention.

[0017] The components include: 1. Primary air pulverized coal pipe; 2. Pulverized coal sampling module; 3. Sealing module; 4. Hoses; 5. Separator; 6. Differential pressure regulating module; 7. Pressure transmission pipe; 8. Differential pressure display; 9. Pressure regulating unit; 10. Housing; 11. Pressure monitoring module; and 12. Data acquisition and storage module. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1 As shown in the figure, a multi-tube integrated coal powder sampling device for simultaneous sampling provided by a specific embodiment of the present invention includes: The coal powder sampling module 2 includes multiple coal powder sampling components for sampling the conveying working medium in the primary air coal powder pipe 1; the sealing module 3 is installed on the coal powder sampling components and fits against the primary air coal powder pipe 1 during operation to prevent coal powder leakage in the primary air coal powder pipe 1 using compressed air pressure; the gas-solid separation module includes a hose 4 connected to each coal powder sampling component, a separator 5 connected to one end of the hose 4, and a powder storage box installed at the solid outlet of the separator 5; and the differential pressure regulating module 6 includes a pressure transmitting pipe 7 connected to the primary air coal powder pipe 1 and the coal powder sampling components during operation, a pressure sensor connected to the pressure transmitting pipe 7 for real-time acquisition of the air pressure difference between the primary air coal powder pipe 1 and the coal powder sampling components, a control unit electrically connected to the pressure sensor, and a pressure regulating unit 9 connected to the primary air coal powder pipe 1 and electrically connected to the control unit during operation.

[0020] Specifically, multiple sampling components are arranged on the primary air pulverized coal pipe 1 of the boiler, with each component corresponding to one primary air pulverized coal pipe 1. During operation, the pulverized coal sampling component is inserted into the primary air pulverized coal pipe 1 and intercepts a portion of the mixture in the pulverized coal and primary air gas-solid two-phase flow flowing inside the pipe. The intercepted pulverized coal and gas mixture flows through the sampling component and is then sent to the gas-solid separation module at the rear end through the hose 4.

[0021] Furthermore, the rear end of each sampling component is connected to a separator 5 via a hose 4; after the collected coal powder and gas mixture enters the separator 5, the gas and solid phases are separated, and the gas is discharged from the gas outlet of the separator 5; the coal powder falls from the solid outlet into the powder storage box below; the metering module in the powder storage box records the amount of coal powder, realizing the measurement of the sampling amount of each pipeline.

[0022] Furthermore, the pressure transmission pipe 7 is connected to the primary air pulverized coal pipe 1 and the pulverized coal sampling assembly respectively, and the air pressure signals from the two locations are led to the pressure sensor; the pressure sensor collects the pressure difference between the primary air duct and the sampling channel in real time and sends the signal to the control unit; the control unit adjusts the working state of the pressure regulating unit 9 according to the set target pressure difference and real-time data: when the pressure difference is too large or too small, the negative pressure is adjusted to keep the pressure difference between the sampling channel and the original pipe within a reasonable range; in this way, stable sampling of multiple pipes simultaneously under uniform conditions can be achieved.

[0023] Based on the above basic implementation method, the coal powder sampling assembly includes a telescopic sampling rod for inserting into the primary air coal powder pipe 1 during operation and a sampling nozzle disposed at one end of the telescopic sampling rod for receiving coal powder in the primary air coal powder pipe 1. The sampling nozzle is connected to the end of the telescopic sampling rod through a detachable structure. The insertion depth of the telescopic sampling rod is adjustable from 50mm to 600mm, and the diameter of the sampling nozzle is adjustable from 5mm to 20mm.

[0024] Specifically, the telescopic sampling rod can be inserted into the primary air pulverized coal pipe 1 in a radial or specific direction, with an adjustable insertion depth ranging from 50 mm to 600 mm; the sampling nozzle is installed at the front end of the telescopic sampling rod with a diameter ranging from 5 mm to 20 mm, and is connected to the rod body through a detachable structure, which facilitates the replacement of different diameters or maintenance and cleaning, and ensures accurate sampling according to the equal annular area sampling method. Working process: The operator adjusts the insertion depth of the telescopic sampling rod according to the sampling location, such as different radii or angles on the pipe cross-section, so that the sampling nozzle is at the target flow field position; when the primary air-coal powder mixture flows through the sampling nozzle, under the negative pressure or pressure difference generated by the differential pressure regulating module, the mixture is "drawn" into the sampling channel by the sampling nozzle; the sampling nozzle diameter can be selected according to the flow velocity in the pipe, the coal powder concentration, and the desired sampling amount: a small diameter is suitable for working conditions with higher flow velocities or higher powder concentrations to avoid excessive sampling; a large diameter is suitable for working conditions with lower flow velocities or lower powder concentrations to ensure sufficient sampling amount; when the telescopic sampling rod is withdrawn or the insertion depth is changed, the air seal structure of the sealing module can still maintain the seal at the perforation without leakage; if maintenance or replacement of the sampling nozzle is required, simply remove the sampling nozzle from the rod end through the disassembly and assembly structure and replace it with the appropriate specification.

[0025] In one specific embodiment, the separator 5 is a cyclone separator, and the powder storage box has a built-in metering module for weighing coal powder; the differential pressure regulating module 6 also includes a differential pressure display 8 electrically connected to the pressure sensor.

[0026] In this embodiment, the cyclone separator has no moving parts, making it suitable for high-temperature, dusty coal powder conditions. It has a simple structure, is wear-resistant, and requires minimal maintenance. It has high separation efficiency for coal powder, a solid with a relatively concentrated particle size range and high density. The powder storage box has a built-in metering module, which can directly weigh the collected coal powder. There is no need to transfer the coal powder to an external weighing device, reducing sample loss and errors. It can achieve rapid metering with near-online, continuous, or multiple-cycle sampling.

[0027] Furthermore, the differential pressure display 8 allows operators to directly observe the pressure difference between the primary air duct and the sampling channel, facilitating on-site observation and operation. If the pressure difference deviates from the set value, such as the pressure difference required to ensure approximately isokinetic sampling, the parameters of the pressure regulating unit can be promptly detected and adjusted. Multiple pipelines have their own differential pressure displays, ensuring consistent sampling conditions for each pipeline and facilitating comparison and optimization of pulverized coal distribution for each burner.

[0028] In another specific embodiment, the pressure regulating unit 9 is a negative pressure vacuum pump.

[0029] Specifically, the vacuum pump can provide adjustable negative pressure, and the operating parameters can be adjusted by the control unit to achieve precise control of the sampling channel pressure. By adjusting the negative pressure, the flow velocity at the sampling nozzle is made close to the mainstream velocity in the primary air duct, reducing sampling deviation and improving the representativeness of coal powder concentration measurement. The entire sampling channel is under negative pressure, so even if there is a slight defect in the seal at a certain point, it will be manifested as outside air being drawn in rather than coal powder being blown out, reducing dust and safety hazards. The negative pressure ensures that coal powder flows along the hose to the separator, making it less likely to accumulate or block in the pipeline, which is conducive to the long-term stable operation of the system.

[0030] In one specific embodiment, the differential pressure regulating module 6, the separator 5, and the powder storage box are disposed inside the housing 10, which is a corrosion-resistant alloy housing; the sealing module 3 is connected to a pressure monitoring unit 11 for real-time monitoring of the compressed air pressure in the sealing module.

[0031] In this embodiment, the differential pressure regulating module 6, separator 5, and powder storage box are housed in a corrosion-resistant alloy enclosure. The main purpose is to centrally arrange key functional modules within a single enclosure 10, enabling standardized complete sets of equipment. On-site installation only requires piping and wiring, facilitating installation and relocation. Power plants or industrial sites often experience high levels of dust and potentially corrosive gases; the corrosion-resistant alloy enclosure protects internal precision instruments, sensors, vacuum pumps, etc., extending their service life. The enclosure also reduces the impact of external temperature fluctuations and windblown dust on the metering module and differential pressure measurement, improving measurement stability and repeatability. Furthermore, enclosing complex pipelines, pumps, and instruments within the enclosure 10 prevents accidental contact, burns, noise, and maintains a cleaner appearance.

[0032] Specifically, the pressure monitoring module 11 monitors the pressure of compressed air in the sealing module 3; it ensures the sealing effect. If the compressed air pressure is too low, the air seal is unreliable, which may cause coal powder to leak from the sampling hole; if it is too high, it may create resistance to the movement of the sampling rod or backflow into the pipe; it facilitates debugging and alarms. Through real-time monitoring and display, upper and lower limits can be set. Once the pressure is abnormal, an alarm can be triggered or the control unit can be adjusted; it helps optimize energy consumption. Under the premise of meeting the sealing effect, the compressed air pressure is controlled within a reasonable range to avoid unnecessary compressed air consumption.

[0033] In another specific embodiment, the simultaneous multi-tube coal powder integrated sampling device also includes a data acquisition and storage module 12 electrically connected to the coal powder sampling module 2, the sealing module 3, the gas-solid separation module, and the differential pressure regulation module 6; the sealing module 3 is a dynamic air seal pipe seat connected to compressed air, and the sealing module 3 is provided with an annular compressed air injection channel to use the dynamic pressure of compressed air to form a dynamic seal between the coal powder sampling component and the sealing module.

[0034] Furthermore, the data acquisition and storage module 12 is connected to the pulverized coal sampling module 2, the sealing module 3, the gas-solid separation module, and the differential pressure regulation module 6. The acquired data includes: differential pressure data of each pipeline, vacuum pump operating parameters; compressed air pressure of the sealing module 3; weighing data of each pulverized coal storage box; and corresponding time information, operating parameters, etc. The function of this module is to form a historical database: to provide a basis for subsequent analysis of furnace combustion, primary and secondary air ratio, pulverized coal distribution when output changes, etc.; to facilitate remote monitoring and automated control: the data can be uploaded to the DCS or host computer to realize remote monitoring and automatic adjustment of multi-pipe sampling status; once problems such as uneven combustion or coking occur, the pulverized coal distribution at that time can be traced back to provide evidence for fault diagnosis.

[0035] Furthermore, the working process of the sealing module 3 is as follows: external compressed air is introduced into the sealing module 3 and enters the internal annular injection channel through the interface; the compressed air is evenly distributed in the annular channel and ejected at high speed from the annular nozzle, aiming at the annular gap between the sampling rod and the module; these high-speed ejected compressed air forms an air curtain or air barrier in the gap area, using the superposition of dynamic pressure and a certain static pressure to prevent primary air coal dust from leaking out of the pipe along the outer surface of the sampling rod; because it is a dynamic air seal, even when the sampling rod is inserted or withdrawn, or swings within a small range, the annular injection still adheres tightly to the circumference of the rod body, maintaining the sealing effect; the pressure monitoring module 11 monitors the compressed air pressure in real time, and if the pressure drops, it will send a signal to prompt the operator to adjust the air source or perform maintenance; if the pressure is too high, it can also prevent unnecessary impact through pressure adjustment and alarm; The working process of the device is as follows: Preliminary preparation: Adjust the telescopic length of the coal powder sampling module 2 and replace the appropriate sampling nozzle according to the inner diameter of the primary air coal powder pipe 1; install the sealing module 3 at the sampling point, connect compressed air, and the pressure monitoring module 11 confirms that the seal is qualified. System startup: The device is turned on via the operation panel on the housing 10, the voltage regulating unit 9 is started, and the PLC controller initializes its parameters; Simultaneous sampling: Each coal powder sampling component simultaneously draws air from the corresponding primary air coal powder pipe 1 and the gas enters the cyclone separator 5 through the hose 4; Automatic adjustment: The pressure sensor collects the air pressure difference through the pressure transmission tube 7. The PLC controller drives the electric actuator to adjust the differential pressure adjustment module 6, so that the reading of the differential pressure display 8 is stable at 0, ensuring constant speed sampling. At the same time, the pressure regulating unit 9 automatically adjusts the power according to the pressure in the tube to maintain a stable negative pressure. Separation and storage: After being separated by cyclone separator 5, coal powder falls into the powder storage box and is automatically metered and sampled. Exhaust gas is discharged to the environment through hose 4 by pressure regulating unit 9; data acquisition and storage module 12 records various parameters in real time. Abnormal handling: If the pressure of the sealing module 3 is insufficient, the pressure monitoring module 11 will trigger an alarm and stop sampling.

[0036] Sampling complete: After sampling is completed, the system automatically shuts off the vacuum pump, the powder storage box can be removed, and the data can be exported or uploaded through the data acquisition and storage module 12.

[0037] To aid in a better understanding of the present invention, a more comprehensive and specific embodiment is described, in which the present invention provides a simultaneous multi-tube integrated coal powder sampling device, comprising: The coal powder sampling module 2 includes multiple coal powder sampling components for sampling the conveying working medium in the primary air coal powder pipe 1; the sealing module 3 is installed on the coal powder sampling components and fits against the primary air coal powder pipe 1 during operation to prevent coal powder leakage in the primary air coal powder pipe 1 using compressed air pressure; the gas-solid separation module includes a hose 4 connected to each coal powder sampling component, a separator 5 connected to one end of the hose 4, and a powder storage box installed at the solid outlet of the separator 5; and the differential pressure regulating module 6 includes a pressure transmitting pipe 7 connected to the primary air coal powder pipe 1 and the coal powder sampling components during operation, a pressure sensor connected to the pressure transmitting pipe 7 for real-time acquisition of the air pressure difference between the primary air coal powder pipe 1 and the coal powder sampling components, a control unit electrically connected to the pressure sensor, and a pressure regulating unit 9 connected to the primary air coal powder pipe 1 and electrically connected to the control unit.

[0038] In this embodiment, the pulverized coal sampling assembly includes a telescopic sampling rod for inserting into the primary air pulverized coal pipe 1 during operation, and a sampling nozzle disposed at one end of the telescopic sampling rod for receiving pulverized coal from the primary air pulverized coal pipe 1. The sampling nozzle is connected to the end of the telescopic sampling rod via a detachable structure. The insertion depth of the telescopic sampling rod is adjustable from 50mm to 600mm, and the diameter of the sampling nozzle is adjustable from 5mm to 20mm. The separator 5 is a cyclone separator, and the pulverized coal storage box contains a metering module for weighing pulverized coal. The differential pressure regulating module 6 also includes a differential pressure display 8 electrically connected to a pressure sensor. The pressure regulating unit 9 is a negative pressure vacuum pump. The differential pressure regulating module 6, the separator 5, and the pulverized coal storage box are disposed within a housing 10, which is a corrosion-resistant alloy housing. The sealing module 3 is connected to a pressure monitoring unit 11 for real-time monitoring of the compressed air pressure in the sealing module.

[0039] Specifically, the multi-tube integrated coal powder sampling device also includes a data acquisition and storage module 12 that is electrically connected to the coal powder sampling module 2, the sealing module 3, the gas-solid separation module, and the differential pressure regulation module 6. The sealing module 3 is a dynamic air seal pipe seat that is connected to compressed air. The sealing module 3 is provided with an annular compressed air injection channel to form a dynamic seal between the coal powder sampling component and the sealing module using the dynamic pressure of compressed air.

[0040] In summary, the embodiments disclosed herein have at least the following technical effects: By arranging multiple sets of coal powder sampling components on multiple primary air coal powder pipes 1 and sampling at the same time, the error caused by the change of operating conditions caused by traditional pipe-by-pipe and time-by-time sampling is avoided, and the coal powder distribution data between different pipelines has higher comparability and representativeness. Each module is integrated into a single system to achieve synchronous measurement of pulverized coal concentration and conveying volume across multiple tubes, providing complete and unified data support for boiler combustion adjustment; The sealing module 3 adopts a dynamic air seal pipe seat that is connected to compressed air. It has an internal annular compressed air injection channel. The dynamic pressure of compressed air forms a gas barrier at the gap between the sampling component and the pipe seat, which effectively prevents primary air coal powder from leaking from the pipe wall perforation, avoiding dust escape and wear on the pipe wall. The dynamic air seal structure achieves a highly reliable seal while not restricting the insertion, removal, and extension of the telescopic sampling rod, thus solving the contradiction of traditional mechanical seals that require both tight fit and difficult movement, and significantly improving the reliability and service life of the device. The sealing module 3 is connected to the pressure monitoring unit 11, which can monitor the compressed air pressure in real time, detect abnormalities in the sealing air source in a timely manner, prevent coal powder leakage and environmental pollution caused by sealing failure, and at the same time help optimize the amount of compressed air used and reduce operating costs. The insertion depth of the telescopic sampling rod is adjustable within the range of 50mm to 600mm, allowing sampling at different radius positions on the cross-section of the primary air pulverized coal pipe. This facilitates the study and understanding of the pulverized coal concentration distribution characteristics within the cross-section and improves the representativeness of the sampling results. The sampling nozzle diameter is selectable in the range of 5mm to 20mm and can be connected to the telescopic sampling rod through a detachable structure. It can be flexibly configured according to different primary air flow rates, coal powder concentrations and desired sampling amounts to adapt to various unit and operating conditions. The combination of adjustable insertion depth and variable diameter facilitates matching the local flow velocity of the sampling nozzle with the mainstream velocity in the pipe according to the principle of approximately isokinetic sampling, thereby reducing sampling deviation and improving the accuracy of coal powder concentration measurement. At the same time, the sampling nozzle can be quickly disassembled and installed, making it easy to clean and replace, and reducing maintenance workload. The gas-solid separation module adopts a cyclone separator structure with no moving parts, making it suitable for high-temperature and high-dust working conditions. It has high separation efficiency, low pressure drop, and good wear resistance, which is conducive to long-term stable operation. The powder storage box has a built-in metering module that can weigh the separated coal powder online, avoiding sample loss and additional errors caused by transferring the sample to an external weighing device in the traditional method, thus improving measurement accuracy. Each primary air pulverized coal pipe 1 corresponds to an independent separator and a pulverized coal storage box with a metering module, which can directly obtain the pulverized coal conveying volume of each pipe, and realize rapid diagnosis and quantitative analysis of uneven pulverized coal distribution in the burner. The differential pressure regulating module 6 sends the pressure of the primary air pulverized coal pipe 1 and the pulverized coal sampling component to the pressure sensor through the pressure transmission pipe 7. The control unit adjusts the working state of the pressure regulating unit according to the real-time differential pressure, forming a closed-loop control. This can stabilize the differential pressure between the sampling channel and the original pipeline within the set range, which is beneficial to ensure near-isokinetic sampling conditions. The pressure regulating unit 9 uses a negative pressure vacuum pump, which can provide adjustable and stable negative pressure, so that the entire sampling channel is in a negative pressure state. This not only facilitates the smooth delivery of coal powder to the separator and reduces pipeline blockage, but also prevents coal powder from leaking outward, thereby improving system safety and environmental friendliness. The differential pressure display 8 will display the real-time differential pressure intuitively, which will facilitate on-site personnel to monitor the operating conditions of each sampling channel, make timely adjustments and troubleshoot anomalies, thereby ensuring the uniformity of sampling conditions for multiple pulverized coal pipes and improving the reliability of multi-pipe data comparison.

[0041] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A simultaneous multi-tube integrated coal powder sampling device, characterized in that, include: The pulverized coal sampling module includes multiple sets of pulverized coal sampling components for sampling the conveying working medium in the primary air pulverized coal pipe; A sealing module is provided on the pulverized coal sampling assembly and fits against the primary air pulverized coal pipe during operation to prevent pulverized coal leakage from the primary air pulverized coal pipe using the pressure of compressed air. The gas-solid separation module includes a hose connected to each of the coal powder sampling components, a separator connected to one end of the hose, and a powder storage box disposed at the solid outlet of the separator. as well as The differential pressure regulation module includes a pressure transmission pipe that is connected to the primary air pulverized coal pipe and the pulverized coal sampling component respectively during operation, a pressure sensor connected to the pressure transmission pipe for real-time acquisition of the air pressure difference between the primary air pulverized coal pipe and the pulverized coal sampling component, a control unit electrically connected to the pressure sensor, and a pressure regulating unit that is connected to the primary air pulverized coal pipe and electrically connected to the control unit during operation.

2. The simultaneous multi-tube integrated coal powder sampling device according to claim 1, characterized in that, The pulverized coal sampling assembly includes a telescopic sampling rod for inserting into the primary air pulverized coal pipe during operation, and a sampling nozzle disposed at one end of the telescopic sampling rod for receiving pulverized coal from the primary air pulverized coal pipe. The sampling nozzle is connected to the end of the telescopic sampling rod via a detachable structure.

3. The simultaneous multi-tube integrated coal powder sampling device according to claim 2, characterized in that, The insertion depth of the telescopic sampling rod is adjustable from 50mm to 600mm, and the diameter of the sampling nozzle is adjustable from 5mm to 20mm.

4. The simultaneous multi-tube integrated coal powder sampling device according to claim 1, characterized in that, The separator is a cyclone separator, and the powder storage box has a built-in metering module for weighing coal powder.

5. The simultaneous multi-tube integrated coal powder sampling device according to claim 1, characterized in that, The differential pressure regulation module also includes a differential pressure display electrically connected to the pressure sensor.

6. The simultaneous multi-tube integrated coal powder sampling device according to claim 1, characterized in that, The pressure regulating unit is a negative pressure vacuum pump.

7. The simultaneous multi-tube integrated coal powder sampling device according to claim 6, characterized in that, The differential pressure regulating module, the separator, and the powder storage box are housed inside the housing, which is a corrosion-resistant alloy housing.

8. The simultaneous multi-tube integrated coal powder sampling device according to claim 1, characterized in that, The sealing module is connected to a pressure monitoring unit for real-time monitoring of the compressed air pressure in the sealing module.

9. The simultaneous multi-tube integrated coal powder sampling device according to claim 1, characterized in that, The simultaneous multi-tube coal powder integrated sampling device also includes a data acquisition and storage module electrically connected to the coal powder sampling module, the sealing module, the gas-solid separation module, and the differential pressure regulation module.

10. The integrated multi-tube pulverized coal sampling device for the same period according to any one of claims 1 to 9, characterized in that, The sealing module is a dynamic air seal pipe seat that is connected to compressed air. The sealing module is provided with an annular compressed air injection channel to form a dynamic seal between the coal powder sampling component and the sealing module by utilizing the dynamic pressure of the compressed air.

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