Coal powder sampling and wind speed measurement device
By designing a rotatable rotary gripper and a backflush pipeline for pulverized coal sampling and wind speed measurement, the problems of poor sample representativeness and clogging in traditional pulverized coal sampling devices have been solved, achieving accuracy and anti-clogging effects, and improving combustion efficiency and equipment operation stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 中电华创(苏州)电力技术研究有限公司
- Filing Date
- 2025-06-26
- Publication Date
- 2026-06-02
AI Technical Summary
Traditional coal powder sampling devices suffer from poor sample representativeness and easy clogging of sampling tubes, affecting sampling accuracy and equipment operating efficiency.
A device comprising a sampling unit, a flow rate measurement unit, and an air compression unit was designed. It achieves isokinetic sampling through a rotatable gripper and is equipped with a backflush pipeline for cleaning, ensuring sampling accuracy and preventing blockage.
This improved the accuracy of pulverized coal sampling and prevented clogging of the sampling tube, ensuring the integrity of pulverized coal combustion and the stable operation of the equipment.
Smart Images
Figure CN224317379U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the technical field of industrial pulverized coal boilers, specifically, it relates to a pulverized coal sampling and wind speed measuring device. Background Technology
[0002] With the continuous development of coal-fired power plants and the increasing severity of fuel costs and environmental pressures, people have higher and higher requirements for boiler combustion. Therefore, improving fuel combustion efficiency, comprehensive energy utilization, and reducing pollutant emissions have become the mainstream development trends. For specific coal types and boiler equipment, controlling the fineness of the pulverized coal entering the furnace within an appropriate range ensures complete combustion while reducing power consumption and equipment wear in the pulverizing system. Accurately measuring the fineness of the pulverized coal is crucial for purposeful and planned control and adjustment of boiler combustion, achieving optimal boiler operation and thus realizing energy-saving goals.
[0003] Traditional pulverized coal sampling devices generally have two drawbacks: First, the sample representativeness is poor. They rely solely on the negative pressure created by compressed air to extract pulverized coal from the tube. This often results in samples that are too fine or too coarse, lacking representativeness, and the sampling point is singular, leading to insufficient accuracy. Second, they are prone to clogging. Differences in air humidity and coal type in different regions can cause pulverized coal to adhere and clog the sampling tube, making subsequent sampling difficult.
[0004] This shows that traditional pulverized coal sampling has significant room for improvement in terms of sampling accuracy and anti-clogging. Utility Model Content
[0005] The technical problem addressed in this application is: how to improve the accuracy of pulverized coal sampling and prevent clogging of the sampling tube.
[0006] This application provides a coal powder sampling and wind speed measuring device, the device comprising:
[0007] The sampling unit includes a sampling tube, a coal powder sampling gripper, an electrically controlled rotating device, and a cyclone separator. The coal powder sampling gripper is rotatably mounted on one end of the sampling tube and is connected to the interior of the sampling tube. The electrically controlled rotating device is used to control the rotation of the coal powder sampling gripper. The cyclone separator is installed on the other end of the sampling tube.
[0008] A flow velocity measurement unit, comprising a backrest tube, a thermocouple, a powder tube temperature measuring device, and a powder tube wind speed measuring device, wherein the thermocouple is located inside the backrest tube, the powder tube temperature measuring device is connected to the thermocouple, and the powder tube wind speed measuring device is connected to the backrest tube;
[0009] An air compression unit includes a negative pressure pipeline and a backflush pipeline. The negative pressure pipeline is connected to the cyclone separator. Compressed air is introduced into one end of the negative pressure pipeline and discharged from the other end to generate negative pressure in the cyclone separator. The negative pressure pipeline is used to adjust the air velocity according to the dust velocity measured by the velocity measurement unit. The backflush pipeline is connected to the cyclone separator.
[0010] Optionally, the sampling unit further includes a heating device, which is wrapped around the outer wall of the sampling tube.
[0011] Optionally, the flow rate measuring unit further includes an automatic feeding device for adjusting the length of the backrest tube extending into the pulverized coal pipeline.
[0012] Optionally, the negative pressure pipeline includes a ventilation pipe and a safety valve, a moisture filter, a solenoid valve, a flow rate detection device, a one-way check valve, and a tail filter installed sequentially along the airflow direction. The side wall of the ventilation pipe has a first opening, the cyclone separator is connected to the first opening, and the first opening is located between the flow rate detection device and the one-way check valve. The solenoid valve is used to adjust the opening degree according to the dust flow rate.
[0013] Optionally, the side wall of the ventilation pipe is provided with a second opening, which is located between the safety valve and the moisture filtration device; the two ends of the backflush pipe are respectively connected to the second opening and the first opening.
[0014] Optionally, the backflush line includes a backflush air pipe and a control valve installed in the backflush air pipe.
[0015] The pulverized coal sampling and wind speed measuring device provided in this application has the following technical advantages:
[0016] The device uses a rotatable gripper to sample from different locations. By adjusting the airflow velocity in the negative pressure pipeline, it achieves isokinetic sampling, improving sampling accuracy. Additionally, a backflush pipeline is installed to clean the sampling tube after sampling, preventing blockage. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the usage state of a coal powder sampling and wind speed measuring device according to one or more embodiments. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0019] Before describing the various embodiments of this application in detail, the technical concept of this application is first briefly described: Current coal powder sampling devices suffer from problems such as inaccurate sampling and easy clogging of the sampling tube. To address this, the coal powder sampling and wind speed measuring device provided in this application mainly includes a sampling unit, a flow velocity measuring unit, and an air compression unit. The sampling unit has a rotatable gripper for sampling at different locations. By adjusting the air flow velocity in the negative pressure pipeline in a linked manner, it is kept consistent with the wind velocity in the coal powder pipe to achieve isokinetic sampling and improve sampling accuracy. Furthermore, by setting up a backflush pipeline, the sampling tube is backflushed and cleaned after sampling to prevent clogging. The specific principle of the coal powder sampling and wind speed measuring device of this application will be described below with reference to more embodiments.
[0020] Specifically, such as Figure 1 As shown, the coal powder sampling and wind speed measurement device of this embodiment includes a sampling unit, a flow rate measurement unit, and an air compression unit. The sampling unit includes a sampling tube 11, a coal powder sampling gripper 12, an electrically controlled rotating device 13, and a cyclone separator 14. The coal powder sampling gripper 12 is rotatably mounted on one end of the sampling tube 11 and is internally connected to the sampling tube 11. The electrically controlled rotating device 13 controls the rotation of the coal powder sampling gripper 12. The cyclone separator 14 is installed on the other end of the sampling tube 11. The flow rate measurement unit includes a backing tube 21, a thermocouple 22, a coal powder tube temperature measuring device 23, and a coal powder tube wind speed measuring device 24. The thermocouple 22 is located inside the backing tube 21, the coal powder tube temperature measuring device 23 is connected to the thermocouple 22, and the coal powder tube wind speed measuring device 23 is connected to the backing tube 21. The air compression unit includes a negative pressure pipeline and a backflush pipeline. The negative pressure pipeline is connected to the cyclone separator, with compressed air entering at one end and exiting at the other to generate negative pressure in the cyclone separator 14. The negative pressure pipeline is also used to adjust the airflow velocity based on the dust velocity measured by the flow velocity meter. The backflush pipeline is also connected to the cyclone separator 14. The coal powder sampling gripper consists of inner and outer rings. When the outer ring rotates clockwise, the inner ring rotates counter-clockwise (or vice versa). The rotation control device 13 drives the internal gears to rotate. The rotation controller can be driven by a small motor and can rotate clockwise or counter-clockwise.
[0021] In this system, after the dust temperature is measured by the dust pipe temperature measuring device 23 and the wind speed is measured by the flow velocity measuring unit, the flow velocity in the dust pipe is calculated collaboratively using the Bernoulli equation. In one or more embodiments, the flow velocity measuring unit further includes an automatic feeding device 25, which is used to adjust the length of the backrest pipe 21 extending into the pulverized coal pipe to accommodate pulverized coal pipes of different diameters. The automatic feeding device 25 contains a slide and gears, is driven by a small motor, and allows manual input of the pulverized coal pipe diameter, achieving horizontal feeding measurement using the Chebyshev measurement method.
[0022] In one or more embodiments, the negative pressure pipeline includes a ventilation pipe 31 and, sequentially installed along the airflow direction, a safety valve 32, a moisture filter 33, a solenoid valve 34, a flow rate detection device 35, a one-way check valve 36, and a tail filter 37. A first opening 31a is provided on the side wall of the ventilation pipe 31, and a cyclone separator 14 communicates with the first opening 31a. The first opening 31a is located between the flow rate detection device 35 and the one-way check valve 36. The solenoid valve 34 is used to adjust its opening according to the dust flow rate. Exemplarily, the dust pipe temperature measuring device 23 and the dust pipe wind speed measuring device 24 collaboratively calculate the dust pipe flow rate using Bernoulli's equation. The flow rate detection device 35 calculates the sampling gun speed using Bernoulli's principle. By comparing the two speeds, the opening of the solenoid valve 34 is controlled to achieve equality between the dust pipe flow rate and the sampling gun flow rate, thus achieving wind speed sampling.
[0023] External compressed air passes through safety valve 32 and then through moisture filter 33 to remove moisture. It then passes through solenoid valve 34 and flow rate detection device 35, followed by one-way check valve 36, and finally through tail filter 37 before being discharged into the air system. The flow of compressed air creates negative pressure at the first opening 31a (behind cyclone separator 14), thereby extracting pulverized coal from the pulverized coal pipeline. The pulverized coal airflow passes through pulverized coal sampling gripper 12 and sampling pipe 11, and is then extracted to cyclone separator 14. The cyclone separator 14 then collects the pulverized coal, thus achieving pulverized coal sampling. During the sampling operation, the electrically controlled rotating device 13 drives the lowered pulverized coal sampling gripper 12 to rotate, achieving uniform sampling around the circumference of the pulverized coal pipeline. A sealing device, using a sampling flange or plug installed in the power plant, prevents pulverized coal ejection.
[0024] In one or more embodiments, a second opening 31b is provided on the side wall of the ventilation pipe 31, located between the safety valve and the moisture filter device 33; the two ends of the backflush pipe are connected to the second opening 31b and the first opening 31a, respectively. The backflush pipe includes a backflush air pipe 38 and a control valve 39 installed on the backflush air pipe 38. During coal dust extraction, the control valve 39 is closed. To ensure isokinetic sampling, the calculated coal dust flow rate is synchronized to the flow rate detection device 35, coordinating with the opening of the solenoid valve 34 to ensure that the coal dust extraction speed is consistent with the air velocity in the coal dust pipe. After coal dust extraction is completed, the control valve 39 is opened, and the solenoid valve 34 and the one-way check valve 36 are closed in conjunction. At this time, compressed air flows through the safety valve 1 and the moisture filter device 33, through the control valve 39, through the sampling pipe 11, and out through the coal dust sampling gripper 12, realizing the backflush cleaning of coal dust.
[0025] In one or more embodiments, the sampling unit further includes a heating device 15, which covers the outer wall of the sampling tube 11. Simultaneously, during backflushing cleaning, the heating device 15 on the outer wall of the sampling tube 11 is activated, and the temperature of the heating device 15 is consistent with the measurement data of the powder tube temperature measuring device 23.
[0026] The coal powder sampling and wind speed measuring device of this embodiment has the following advantages:
[0027] (1) This device is equipped with an automatic feeding wind speed measurement module, which can measure the wind speed of the powder pipe in real time.
[0028] (2) This device can change the speed of compressed air in real time through linkage adjustment to keep it consistent with the wind speed of the powder pipe, so as to achieve isokinetic sampling.
[0029] (3) This device can be adapted to different powder pipe diameters through four adjustable length rotating grippers.
[0030] (4) This device can control the compressed air and the circumferential heating of the sampling gun through valves to achieve backflushing cleaning.
[0031] (5) This device is equipped with a safety valve and a filter to ensure safe operation and prevent environmental pollution.
[0032] The specific embodiments of this application have been described in detail above. Although some embodiments have been shown and described, those skilled in the art should understand that modifications and improvements can be made to these embodiments without departing from the principles and spirit of this application as defined by the claims and their equivalents, and such modifications and improvements should also be within the protection scope of this application.
Claims
1. A coal powder sampling and wind speed measuring device, characterized in that, The device includes: The sampling unit includes a sampling tube, a coal powder sampling gripper, an electrically controlled rotating device, and a cyclone separator. The coal powder sampling gripper is rotatably mounted on one end of the sampling tube and is connected to the interior of the sampling tube. The electrically controlled rotating device is used to control the rotation of the coal powder sampling gripper. The cyclone separator is installed on the other end of the sampling tube. A flow velocity measurement unit, comprising a backrest tube, a thermocouple, a powder tube temperature measuring device, and a powder tube wind speed measuring device, wherein the thermocouple is located inside the backrest tube, the powder tube temperature measuring device is connected to the thermocouple, and the powder tube wind speed measuring device is connected to the backrest tube; An air compression unit includes a negative pressure pipeline and a backflush pipeline. The negative pressure pipeline is connected to the cyclone separator. Compressed air is introduced into one end of the negative pressure pipeline and discharged from the other end to generate negative pressure in the cyclone separator. The negative pressure pipeline is used to adjust the air velocity according to the dust velocity measured by the velocity measurement unit. The backflush pipeline is connected to the cyclone separator.
2. The coal powder sampling and wind speed measuring device according to claim 1, characterized in that, The sampling unit also includes a heating device, which is wrapped around the outer wall of the sampling tube.
3. The coal powder sampling and wind speed measuring device according to claim 1, characterized in that, The flow rate measurement unit also includes an automatic feeding device, which is used to adjust the length of the backrest tube extending into the pulverized coal pipeline.
4. The coal powder sampling and wind speed measuring device according to claim 1, characterized in that, The negative pressure pipeline includes a ventilation pipe and a safety valve, a moisture filter, a solenoid valve, a flow rate detection device, a one-way check valve, and a tail filter installed sequentially along the airflow direction. The side wall of the ventilation pipe has a first opening, the cyclone separator is connected to the first opening, and the first opening is located between the flow rate detection device and the one-way check valve. The solenoid valve is used to adjust the opening degree according to the dust flow rate.
5. The coal powder sampling and wind speed measuring device according to claim 4, characterized in that, The side wall of the ventilation pipe has a second opening, which is located between the safety valve and the moisture filtration device; the two ends of the backflush pipe are respectively connected to the second opening and the first opening.
6. The coal powder sampling and wind speed measuring device according to claim 5, characterized in that, The backflush line includes a backflush air pipe and a control valve installed on the backflush air pipe.