On-line measuring device for fineness of pulverized coal in pulverized coal pipe of coal-fired power plant

Abstract

The invention provides a coal-fired power plant powder pipe pulverized coal fineness on-line measuring device, and relates to the field of thermotechnical testing devices.The coal-fired power plant powder pipe pulverized coal fineness on-line measuring device comprises a first mounting ring and a second mounting ring, the first mounting ring and the second mounting ring are mounted on a pulverized coal pipeline at an interval, and a sampling mechanism is arranged in the pulverized coal pipeline through the first mounting ring; the measuring mechanism is fixedly mounted on the pulverized coal pipeline through a mounting plate, the sampling mechanism is communicated with the measuring mechanism through a conveying pipeline, the discharging pipeline is communicated with the pulverized coal pipeline through a second mounting ring, and a feeding port of the discharging pipeline is communicated with the measuring mechanism. Pulverized coal in the pulverized coal pipeline is conveyed to the measuring mechanism through the material conveying pipeline by the sampling mechanism for online detection of the fineness of the pulverized coal, and then the pulverized coal in the measuring mechanism is blown into the pulverized coal pipeline through the discharging pipeline, so that the fineness of the pulverized coal can be measured in real time; and the included angle of the separator or the material level of the coal mill is adjusted according to the measurement result to obtain the optimal pulverized coal fineness, so that the combustion of the boiler is stabilized, and the efficiency of the boiler is improved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal testing devices, and in particular to an online measuring device for the fineness of pulverized coal in a pulverized pipe of a coal-fired power plant. Background Art

[0002] As an important indicator of coal-fired power plants, coal powder fineness not only determines whether the furnace combustion is stable, but also affects the boiler efficiency. In recent years, coal-fired power plants have increased the proportion of low-quality coal blending, which has caused a significant change in the actual coal quality compared with the verified coal quality, and the coal powder fineness has also changed accordingly. In order to more intuitively monitor the coal powder fineness of the coal entering the furnace, making combustion adjustments for different coal powder finenesses is the key to improving boiler efficiency and smooth operation.

[0003] At present, the coal powder fineness measurement method of coal-fired power plants is basically to adopt the sampling method. After taking out the coal powder sample from the coal powder pipeline with an isokinetic sampling tube, the particle size of the coal powder is obtained by screening method in the laboratory. This measurement method takes a long time and has a large amount of operation. In fact, it is impossible to control the material level of the coal mill and the operation of the coal powder separator at any time to obtain the optimal coal powder particle size for combustion. Secondly, for the online detection of coal powder fineness, the spatial distribution of coal powder is uneven during the flow of the powder pipe, and the distribution changes with time, making it difficult to find the law of flow. At the same time, the high-speed scouring of coal powder will wear the measuring device, and the high temperature of the coal powder itself will also affect the life of the online measuring device. Therefore, it is urgent to design an online measuring device for the fineness of coal powder in the powder pipe of a coal-fired power plant to solve the above problems. Summary of the invention

[0004] The present invention provides an online measuring device for fineness of pulverized coal in a pulverized pipe of a coal-fired power plant, which is used to solve at least one of the problems raised by the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention discloses an online measurement device for the fineness of coal powder in a powder pipe of a coal-fired power plant, comprising a first mounting ring and a second mounting ring, the first mounting ring and the second mounting ring being installed on the coal powder pipeline at a distance, a sampling mechanism being arranged in the coal powder pipeline through the first mounting ring, a measuring mechanism being fixedly installed on the coal powder pipeline through a mounting plate, the sampling mechanism being connected to the measuring mechanism through a feeding pipeline, a discharging pipeline being connected to the coal powder pipeline through the second mounting ring, and a feeding port of the discharging pipeline being connected to the measuring mechanism.

[0006] Preferably, the sampling mechanism includes a connecting elbow, one end of the connecting elbow is connected to the feed port of the feed pipeline, and a sampling tube is fixedly installed on the other end of the connecting elbow. The side wall of the sampling tube is provided with a plurality of through holes, a flow valve 1 is fixedly connected to the feed pipeline, and a flow valve 2 is fixedly connected to the discharge pipeline.

[0007] Preferably, it also includes a mounting seat, which is fixedly mounted on the side wall of the pulverized coal pipeline, and the cylinder is fixedly mounted on the mounting seat, and the telescopic end of the cylinder is fixedly connected to an air blowing pipe, and one end of the air blowing pipe slides through the side wall of the pulverized coal pipeline and is fixedly connected to a sealing head, and the air blowing pipe is fixedly connected to a valve, and a blowing port is provided at the valve.

[0008] Preferably, the measuring mechanism includes a box body, which is fixedly mounted on the side wall of the pulverized coal pipeline through a mounting plate, and the top of the box body is connected with a first collecting trough and a second collecting trough at intervals on the left and right sides, the discharge port of the feed pipeline is connected with the first collecting trough, and a material guide pipe 1 is fixedly connected to the top of the first collecting trough, and a material guide pipe 2 is fixedly installed on the top of the second collecting trough, the tops of the material guide pipe 1 and the material guide pipe 2 are respectively connected to the feed pipeline, and a first screen and a second screen are respectively embedded in the upper and lower inner walls of one side of the feed pipeline, and the air inlet of the air pipe is connected with the top of the box body.

[0009] Preferably, an exhaust pipe is connected to the top of the feeding pipe, one end of the exhaust pipe is fixedly connected to a nozzle, one end of the spiral feeding rod is rotatably connected to the inner wall of the feeding pipe, and the other end of the spiral feeding pipe is rotated to the side wall that passes through the feeding pipe and is fixedly installed with a fan blade, and the nozzle is located above the fan blade.

[0010] Preferably, the box body is provided with a first induction electrode and a second induction electrode, the first induction electrode and the second induction electrode are respectively embedded on the side wall of the box body with a distance therebetween, and two guide plates are fixedly mounted on the inner walls on the left and right sides of the box body;

[0011] The first sensing electrode comprises a first metal electrode, the first metal electrode is fixedly mounted on the inner wall of the box body through a fixing seat 1, the outer wall of the first metal electrode is provided with a first insulating protective layer, and the first electrode terminal is fixedly connected to one end of the first metal electrode through a first insulating block;

[0012] The second sensing electrode includes a second metal electrode, which is fixedly mounted on the inner wall of the box through a second fixing seat, an outer wall of the second metal electrode is provided with a second insulating protective layer, and a second electrode terminal is fixedly connected to one end of the second metal electrode through a second insulating block.

[0013] Preferably, it also includes a shell, which is fixedly mounted on the outer wall of the box body, the signal acquisition unit is located in the shell, and the signal acquisition unit is fixedly mounted on the side wall of the box body, the signal operation analysis unit is fixedly mounted on the inner wall of the shell, and the first electrode terminal, the second electrode terminal, the signal acquisition unit and the signal operation analysis unit are electrically connected.

[0014] Preferably, the invention also includes a coal powder concentration detection device, which is used for real-time detection of the concentration of the transported coal powder in the process of detecting the fineness of the coal powder inside the coal powder pipeline by the coal-fired power plant powder pipe coal powder fineness online measurement device, and the coal powder concentration detection device includes:

[0015] Electromagnetic wave transmission flowmeter, used to detect the amount of pulverized coal supplied in the pulverized coal pipeline per unit time;

[0016] A temperature sensor is used to detect the temperature inside the pulverized coal pipeline when conveying pulverized coal;

[0017] A pressure sensor is used to detect the internal pressure of the pulverized coal pipeline when conveying pulverized coal;

[0018] Gas density sensor, used to detect the density of air inside the pulverized coal pipeline;

[0019] A controller and an alarm, wherein the controller is electrically connected to an electromagnetic wave transmission flow meter, a temperature sensor, a pressure sensor, a gas density sensor and an alarm, and the controller controls the operation of the alarm based on the electromagnetic wave transmission flow meter, the temperature sensor, the pressure sensor and the gas density sensor.

[0020] Preferably, the controller controls the alarm based on the electromagnetic wave transmission flowmeter, temperature sensor, pressure sensor and gas density sensor to work, including:

[0021] According to the formula and the detection values ​​obtained by the electromagnetic wave transmission flowmeter, temperature sensor, pressure sensor and gas density sensor, the concentration of the coal powder transported by the online measurement device for coal powder fineness of the coal-fired power plant during the detection of the coal powder fineness inside the coal powder pipeline is calculated. The controller compares the concentration C of the coal powder transported during the current coal powder fineness detection process inside the coal powder pipeline with the preset concentration range of the coal powder transported inside the coal powder pipeline. If the concentration C of the coal powder transported during the current coal powder fineness detection process inside the coal powder pipeline is not within the preset concentration range of the coal powder transported inside the coal powder pipeline, the controller controls the alarm to sound an alarm:

[0022]

[0023] Among them, C is the concentration of the coal powder transported during the coal powder fineness detection process inside the coal powder pipeline, Q is the detection value of the electromagnetic wave transmission flowmeter on the powder supply amount of the coal powder pipeline per unit time, d is the diameter of the coal powder pipeline, k is the proportional coefficient of the flow rate of the coal powder pipeline when transporting coal powder and the pipeline pressure, T is the detection value of the internal temperature of the coal powder pipeline when transporting coal powder by the temperature sensor, P is the detection value of the internal pressure of the coal powder pipeline when transporting coal powder by the pressure sensor, and θ is the detection value of the air density inside the coal powder pipeline by the gas density sensor.

[0024] The present invention provides an online measurement device for the fineness of pulverized coal in a pulverized pipe of a coal-fired power plant. Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The sampling mechanism and measuring mechanism set on the coal powder pipeline effectively avoids the operator from using the screening method to measure the coal powder fineness after extracting the coal powder through the sampling tube, which greatly shortens the time of coal powder fineness measurement. Secondly, it reduces the impact of the uneven spatial distribution of coal powder in the powder pipe flow process and the change of distribution over time, which makes it difficult to find the flow law. At the same time, it avoids the high-speed erosion of coal powder on the online measuring device, and also reduces the high temperature of the coal powder itself and the harsh environment that affect the service life of the online measuring device.

[0026] 2. By setting the online measurement device for coal powder fineness in the pulverized coal pipe of a coal-fired power plant in the vertical or horizontal section, the coal powder fineness inside the coal powder pipeline can be measured in real time, and the separator angle or coal mill material level can be adjusted according to the measurement results to obtain the optimal coal powder fineness, which not only stabilizes the combustion of the boiler but also improves the efficiency of the boiler; at the same time, during the online measurement of coal powder fineness, when the coal quality changes, the operating personnel can understand the changes in coal powder fineness in real time and make corresponding combustion adjustments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic structural diagram of an online device for measuring fineness of pulverized coal in a pulverized pipe of a coal-fired power plant provided by an embodiment of the present invention;

[0029] Figure 2 for Figure 1 A schematic diagram of the structure with a partial enlargement at the center;

[0030] Figure 3 A schematic diagram of the structure inside a measuring mechanism in an online measuring device for fineness of pulverized coal in a pulverized pipe of a coal-fired power plant provided in an embodiment of the present invention.

[0031] Reference numerals:

[0032] 1. First mounting ring; 2. Second mounting ring; 3. Pulverized coal pipeline; 4. Sampling mechanism; 5. Measuring mechanism; 6. Feed pipeline; 7. Discharge pipeline; 8. Connecting elbow; 9. Sampling tube; 91. Through hole; 10. Flow valve 1; 11. Flow valve 2; 12. Mounting seat; 13. Cylinder; 14. Air blowing pipe; 15. Sealing head; 16. Valve; 17. Air blowing port; 18. Box; 19. Mounting plate; 20. First collecting tank; 21. Second collecting tank; 22. Material guide pipe 1; 23. Material guide pipe 2; 24. Feeding pipeline; 2 5. The first screen; 26. The second screen; 27. The air pipe; 28. The exhaust pipe; 29. ​​The nozzle; 30. The spiral feed rod; 31. The fan blade; 32. The guide plate; 33. The first metal electrode; 34. The first fixing seat; 35. The first insulating protective layer; 36. The first insulating block; 37. The first electrode terminal; 38. The second metal electrode; 39. The second fixing seat; 40. The second insulating protective layer; 41. The second insulating block; 42. The second electrode terminal; 43. The shell; 44. The signal acquisition unit; 45. The signal operation analysis unit. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The present invention provides the following embodiments

[0035] Example 1

[0036] The embodiment of the present invention provides an online measurement device for fineness of pulverized coal in a pulverized pipe of a coal-fired power plant, such as Figure 1 As shown, it includes a first mounting ring 1 and a second mounting ring 2, the first mounting ring 1 and the second mounting ring 2 are installed on the pulverized coal pipeline 3 at a distance, a sampling mechanism 4 is arranged in the pulverized coal pipeline 3 through the first mounting ring 1, and a measuring mechanism 5 is fixedly installed on the pulverized coal pipeline 3 through a mounting plate 19, the sampling mechanism 4 is connected with the measuring mechanism 5 through a feeding pipeline 6, and a discharge pipeline 7 is connected with the pulverized coal pipeline 3 through the second mounting ring 2, and a feed port of the discharge pipeline 7 is connected with the measuring mechanism 5.

[0037] Preferably, the sampling mechanism 4 includes a connecting elbow 8, one end of the connecting elbow 8 is connected to the feed port of the feed pipeline 6, and the other end of the connecting elbow 8 is fixedly installed with a sampling tube 9, and the side wall of the sampling tube 9 is provided with a plurality of through holes 91, the feed pipeline 6 is fixedly connected with a flow valve 10, and the discharge pipeline 7 is fixedly connected with a flow valve 2 11.

[0038] Preferably, it also includes a mounting seat 12, which is fixedly mounted on the side wall of the pulverized coal pipeline 3, and a cylinder 13 is fixedly mounted on the mounting seat 12, and the telescopic end of the cylinder 13 is fixedly connected to a blowing pipe 14, and one end of the blowing pipe 14 slides through the side wall of the pulverized coal pipeline 3 and is fixedly connected to a sealing head 15, and a valve 16 is fixedly connected to the blowing pipe 14, and a blowing port 17 is provided at the valve 16.

[0039] The working principle and beneficial effects of the above technical solution are:

[0040] The present invention discloses an online measuring device for the fineness of coal powder in a powder tube of a coal-fired power plant, which mainly comprises a first mounting ring 1, a second mounting ring 2, a sampling mechanism 4 and a measuring mechanism 5. A feeding pipeline 6 is connected to the coal powder pipeline 3 through the first mounting ring 1. The coal powder to be tested is transported to the testing mechanism through the feeding pipeline by the sampling mechanism 4 arranged in the coal powder pipeline 3 for testing the fineness of the coal powder. A discharging pipeline 7 connected to the measuring mechanism 5 can transport the tested coal powder to the coal powder pipeline 3 again. The first mounting ring 1 and the second mounting ring 2 can realize the quick installation and disassembly of the feeding pipeline 6 and the discharging pipeline 7, and are also convenient for subsequent disassembly and assembly from the coal powder pipeline 3 when the online measuring device for the fineness of coal powder in a powder tube of a coal-fired power plant is repaired and maintained.

[0041] Secondly, when the sampling mechanism 4 is sampling, the flow valve 10 on the feeding pipe 6 is first opened, and the coal powder to be detected in the coal powder pipe 3 continuously enters the sampling pipe 9 from the through hole 91 of the sampling pipe 9, and the coal powder to be detected is transported to the feeding pipe 6 through the connecting elbow 8 connected to the sampling pipe 9. At this time, the feeding pipe 6 transports the coal powder to the measuring mechanism 5 to complete the detection; when the detection is completed, the cylinder 13 fixedly installed on the outer wall of the coal powder pipe 3 by the mounting seat 12 is driven by the expansion and contraction of the cylinder 13 to move the fixedly connected blowing pipe 14 to the left. At this time, the sealing head 15 connected to the air outlet of the blowing pipe 14 is connected to the bottom of the sampling pipe 9, and the valve 16 set on the blowing pipe 14 is opened, and then air is blown from the blowing port 17, so that the coal powder inside the sampling mechanism 4 is cleared, and the coal powder to be detected inside the measuring mechanism 5 can also be screened and the detection is completed.

[0042] The above-mentioned coal-fired power plant powder pipe coal powder fineness online measurement device effectively avoids the operator from using the screening method to measure the coal powder fineness after extracting the coal powder through the sampling tube 9 through the sampling mechanism 4 and the measuring mechanism 5 arranged on the coal powder pipeline 3, which greatly shortens the time for measuring the coal powder fineness. Secondly, it reduces the impact of the uneven spatial distribution of coal powder in the powder pipe flow process and the change of distribution over time, making it difficult to find the flow law. At the same time, it avoids the high-speed erosion of coal powder to wear the online measurement device, and also reduces the high temperature of the coal powder itself and the harsh environment that affect the service life of the online measurement device.

[0043] Example 2

[0044] On the basis of Example 1, Figure 1-Figure 3 As shown, the measuring mechanism 5 includes a box body 18, and the box body 18 is fixedly installed on the side wall of the pulverized coal pipeline 3 through a mounting plate 19. The top of the box body 18 is connected with a first collecting tank 20 and a second collecting tank 21 at intervals on the left and right. The discharge port of the feed pipeline 6 is connected with the first collecting tank 20, and the top of the first collecting tank 20 is fixedly connected with a material guide pipe 1 22, and the top of the second collecting tank 21 is fixedly installed with a material guide pipe 23. The tops of the material guide pipe 1 22 and the material guide pipe 23 are respectively connected with the feeding pipeline 24, and the inner wall of one side of the feeding pipeline 24 is respectively embedded with a first screen 25 and a second screen 26, and the air inlet of the air pipe 27 is connected with the top of the box body 18.

[0045] Preferably, an exhaust pipe 28 is connected to the top of the feeding pipe 24, one end of the exhaust pipe 28 is fixedly connected to a nozzle 29, one end of a spiral feeding rod 30 is rotatably connected to the inner wall of the feeding pipe 24, and the other end of the spiral feeding pipe is rotated to the side wall that passes through the feeding pipe 24 and a fan blade 31 is fixedly installed, and the nozzle 29 is located above the fan blade 31.

[0046] Preferably, the box 18 is provided with a first sensing electrode and a second sensing electrode, the first sensing electrode and the second sensing electrode are respectively embedded on the side wall of the box 18 at a distance from each other, and two guide plates 32 are fixedly mounted on the inner walls on the left and right sides of the box 18;

[0047] The first sensing electrode includes a first metal electrode 33, which is fixedly mounted on the inner wall of the box body 18 through a fixing seat 34, and an outer wall of the first metal electrode 33 is provided with a first insulating protective layer 35, and a first electrode terminal 37 is fixedly connected to one end of the first metal electrode 33 through a first insulating block 36;

[0048] The second sensing electrode includes a second metal electrode 38, which is fixedly mounted on the inner wall of the box body 18 through a second fixing seat 39, and an outer side wall of the second metal electrode 38 is provided with a second insulating protective layer 40, and a second electrode terminal 42 is fixedly connected to one end of the second metal electrode 38 through a second insulating block 41.

[0049] Preferably, it also includes a shell 43, which is fixedly mounted on the outer wall of the box body 18, and a signal acquisition unit 44 is located in the shell 43, and the signal acquisition unit 44 is fixedly mounted on the side wall of the box body 18, and a signal operation analysis unit 45 is fixedly mounted on the inner wall of the shell 43, and the first electrode terminal 37, the second electrode terminal 42, the signal acquisition unit 44 and the signal operation analysis unit 45 are electrically connected.

[0050] The working principle and beneficial effects of the above technical solution are:

[0051] The first collecting tank 20 and the second collecting tank 21 are provided on the measuring mechanism 5. When the sampling mechanism 4 conveys the coal powder to be detected to the first collecting tank 20, the coal powder to be detected is conveyed to the feeding pipe 24 through the guide pipe 1 22. After being screened by the first screen 25, the larger particles of coal powder contained in the coal powder are filtered out and then conveyed to the box 18 through the guide pipe 1 22 for detection. After being screened by the first screen 25, the coal powder enters the feeding pipe 24. At this time, the air blowing pipe 14 in the sampling mechanism 4 blows air, so that the coal powder passes through the second screen 26. The pulverized coal in the feed pipe 24 falls into the feed pipe 24, and the air outlet of the exhaust pipe 28 is oriented to the fan blades 31 through the connected nozzle 29 to exhaust the air. At this time, the spiral feed rod 30 fixedly connected to the fan blades 31 is driven to rotate, so that the pulverized coal in the feed pipe 24 enters the second collecting tank 21 through the guide pipe 23, and is thus transported to the measuring mechanism 5 through the second collecting tank 21 to complete the coal powder fineness detection of smaller particles. The above-mentioned mechanism can screen the coal powder to be detected and complete the preliminary fineness classification, thereby improving the accuracy and efficiency of the online detection device for coal powder fineness.

[0052] The first sensing electrode and the second sensing electrode arranged in the box 18 cooperate with the signal acquisition unit 44 and the signal operation analysis unit 45 to complete the detection of the fineness of the coal powder by the electric induction method; wherein, the electric induction method is also called the Coulter resistance particle size analysis method (hereinafter referred to as the Coulter method), and its working principle is relatively simple. When the coal powder particles pass through the two electrodes, the change in the resistance between the electrodes is proportional to the cross-sectional area of ​​the particles, and the particle size can be measured by converting it into a corresponding voltage amplitude output. The resistance measured by the first metal electrode 33, the first insulating protective layer 35 and the first electrode terminal 37 set by the first sensing electrode is compared with the voltage amplitude change between the resistance measured by the second metal electrode 38, the second insulating protective layer 40 and the second electrode terminal 42 set by the second sensing electrode, so that the fineness of the coal powder transported by the coal powder pipeline 3 is measured by the signal acquisition unit 44 and the signal operation analysis unit 45; at the same time, the electric induction method used by the measuring mechanism 5 in the invention can also realize the online measurement of the fineness of the coal powder by the electrostatic method or the capacitance method.

[0053] The above-mentioned online measurement device for the fineness of coal powder through the powder pipe of a coal-fired power plant is arranged at the vertical section or horizontal section of the coal powder pipeline 3. It can measure the fineness of coal powder inside the coal powder pipeline 3 in real time, and adjust the separator angle or the pulverizer material level according to the measurement result to obtain the optimal coal powder fineness, which not only stabilizes the combustion of the boiler, but also improves the efficiency of the boiler; at the same time, during the process of online measurement of coal powder fineness, when the coal quality changes, the operating personnel can understand the change of coal powder fineness in real time, so as to make corresponding combustion adjustments to the boiler.

[0054] Example 3

[0055] On the basis of Embodiment 1 or 2, the device for measuring the fineness of coal powder in a powder pipe of a coal-fired power plant further comprises a coal powder concentration detection device, which is used for real-time detection of the concentration of the transported coal powder in the process of detecting the fineness of the coal powder in the coal powder pipe 3 of the coal-fired power plant. The coal powder concentration detection device comprises:

[0056] The electromagnetic wave transmission flow meter is used to detect the amount of pulverized coal supplied in the pulverized coal pipeline 3 per unit time;

[0057] A temperature sensor is used to detect the temperature inside the pulverized coal pipeline 3 when conveying pulverized coal;

[0058] A pressure sensor is used to detect the pressure inside the pulverized coal pipeline 3 when conveying pulverized coal;

[0059] A gas density sensor, used to detect the density of the air inside the pulverized coal pipeline 3;

[0060] A controller and an alarm, wherein the controller is electrically connected to an electromagnetic wave transmission flow meter, a temperature sensor, a pressure sensor, a gas density sensor and an alarm, and the controller controls the operation of the alarm based on the electromagnetic wave transmission flow meter, the temperature sensor, the pressure sensor and the gas density sensor.

[0061] Preferably, the controller controls the alarm based on the electromagnetic wave transmission flowmeter, temperature sensor, pressure sensor and gas density sensor to work, including:

[0062] According to the formula and the detection values ​​obtained by the electromagnetic wave transmission flowmeter, temperature sensor, pressure sensor and gas density sensor, the concentration of the coal powder transported by the online measurement device for coal powder fineness of the coal-fired power plant during the detection of the coal powder fineness inside the coal powder pipeline 3 is calculated. The controller compares the concentration C of the coal powder transported during the current coal powder fineness detection process inside the coal powder pipeline 3 with the preset concentration range of the coal powder transported inside the coal powder pipeline 3. If the concentration C of the coal powder transported during the current coal powder fineness detection process inside the coal powder pipeline 3 is not within the preset concentration range of the coal powder transported inside the coal powder pipeline 3, the controller controls the alarm to sound an alarm:

[0063]

[0064] Wherein, C is the concentration of the coal powder transported during the coal powder fineness detection process inside the coal powder pipeline 3, Q is the detection value of the electromagnetic wave transmission flowmeter on the powder supply amount of the coal powder pipeline 3 per unit time (where the unit of the powder supply amount Q is t / h), d is the diameter of the coal powder pipeline 3, k is the proportional coefficient of the flow rate of the coal powder pipeline 3 when transporting coal powder and the pipeline pressure (usually taken as 0.84), T is the detection value of the internal temperature of the coal powder pipeline 3 when transporting coal powder by the temperature sensor, P is the detection value of the internal pressure of the coal powder pipeline 3 when transporting coal powder by the pressure sensor, and θ is the detection value of the air density inside the coal powder pipeline 3 by the gas density sensor (where the unit of the air density value θ is kg / m 3 ).

[0065] The beneficial effects of the above technical solution are as follows: according to the formula and the detection values ​​of the electromagnetic wave transmission flowmeter, the temperature sensor, the pressure sensor and the gas density sensor, the concentration of the coal powder transported by the online measuring device for the fineness of coal powder in the coal-fired power plant pulverized pipe is calculated during the detection of the fineness of coal powder inside the coal powder pipeline 3, and the calculation result is more accurate and reliable by comprehensively considering the amount of coal powder supplied per unit time in the coal powder pipeline 3, the diameter of the coal powder pipeline 3, the proportional coefficient of the flow rate of the coal powder pipeline 3 when transporting coal powder and the pipeline pressure, the temperature inside the coal powder pipeline 3 when transporting coal powder, the pressure inside the coal powder pipeline 3 when transporting coal powder, and the air density value inside the coal powder pipeline 3;

[0066] The controller controls the operation of the electromagnetic wave transmission flowmeter, the temperature sensor, the pressure sensor, the gas density sensor and the alarm. If the concentration of the coal powder transported during the coal powder fineness detection process inside the current coal powder pipeline 3 is not within the preset concentration range of the coal powder transported inside the conveying pipeline, the inside of the coal powder pipeline 3 is inspected, and the online measuring device for the fineness of coal powder in the powder pipe of the coal-fired power plant is maintained according to the actual inspection results to maintain the use requirements of the online detection device, while ensuring the normal working state of the online measuring device for the fineness of coal powder in the powder pipe of the coal-fired power plant and the conveying efficiency of the coal powder pipeline 3. rate, and effectively improved the service life of the online measurement device for the fineness of pulverized coal in the powder tube of a coal-fired power plant, further satisfying the combustion adjustment of the boiler of the thermal power plant according to different pulverized coal finenesses, thereby improving the key to the coal combustion efficiency and stable operation of the boiler. By real-time monitoring of the concentration of the pulverized coal pipeline 3 when conveying pulverized coal, it is possible not only to timely adjust the separator angle of the coal conveying equipment or the material level of the coal mill to obtain the optimal pulverized coal fineness, stabilize the combustion of the boiler, but also improve the efficiency of the boiler, and ensure that the online measurement device for the fineness of pulverized coal in the powder tube of a coal-fired power plant can be quickly discovered and replaced in time after a failure occurs.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An online measurement device for fineness of coal powder in a coal-fired power plant, characterized in that: The invention comprises a first mounting ring (1) and a second mounting ring (2), wherein the first mounting ring (1) and the second mounting ring (2) are mounted on a pulverized coal pipeline (3) at a distance from each other, a sampling mechanism (4) is arranged in the pulverized coal pipeline (3) through the first mounting ring (1), a measuring mechanism (5) is fixedly mounted on the pulverized coal pipeline (3) through a mounting plate (19), the sampling mechanism (4) is connected to the measuring mechanism (5) through a feeding pipeline (6), a discharging pipeline (7) is connected to the pulverized coal pipeline (3) through the second mounting ring (2), and a feeding port of the discharging pipeline (7) is connected to the measuring mechanism (5).

2. The device for online measuring fineness of pulverized coal in a coal-fired power plant according to claim 1, characterized in that: The sampling mechanism (4) comprises a connecting elbow (8), one end of the connecting elbow (8) is connected to the feed port of the feed pipeline (6), the other end of the connecting elbow (8) is fixedly mounted with a sampling tube (9), the side wall of the sampling tube (9) is provided with a plurality of through holes (91), a flow valve 1 (10) is fixedly connected to the feed pipeline (6), and a flow valve 2 (11) is fixedly connected to the discharge pipeline (7).

3. The device for online measuring fineness of pulverized coal in a pulverized pipe of a coal-fired power plant according to claim 2 is characterized in that: The invention also comprises a mounting seat (12), wherein the mounting seat (12) is fixedly mounted on the side wall of the pulverized coal pipeline (3), a cylinder (13) is fixedly mounted on the mounting seat (12), and a telescopic end of the cylinder (13) is fixedly connected to a blowing pipe (14), and one end of the blowing pipe (14) slides through the side wall of the pulverized coal pipeline (3) and is fixedly connected to a sealing head (15), and a valve (16) is fixedly connected to the blowing pipe (14), and a blowing port (17) is provided at the valve (16).

4. The device for online measuring fineness of pulverized coal in a coal-fired power plant according to claim 1, characterized in that: The measuring mechanism (5) comprises a box body (18), the box body (18) is fixedly mounted on the side wall of the pulverized coal pipeline (3) through a mounting plate (19), a first collecting trough (20) and a second collecting trough (21) are connected to the top of the box body (18) at intervals on the left and right, the discharge port of the feed pipeline (6) is connected to the first collecting trough (20), and a first guide pipe (22) is fixedly connected to the top of the first collecting trough (20), and a second guide pipe (23) is fixedly mounted to the top of the second collecting trough (21), the tops of the first guide pipe (22) and the second guide pipe (23) are respectively connected to the feed pipeline (24), a first screen (25) and a second screen (26) are respectively embedded in the upper and lower inner walls of one side of the feed pipeline (24), and an air inlet of an air pipe (27) is connected to the top of the box body (18).

5. The device for online measuring fineness of pulverized coal in a coal-fired power plant according to claim 4, characterized in that: The top of the feeding pipe (24) is connected to an exhaust pipe (28), one end of the exhaust pipe (28) is fixedly connected to a nozzle (29), one end of a spiral feeding rod (30) is rotatably connected to the inner wall of the feeding pipe (24), and the other end of the spiral feeding pipe is rotated to the side wall that passes through the feeding pipe (24) and is fixedly installed with a fan blade (31), and the nozzle (29) is located above the fan blade (31).

6. The device for online measuring fineness of pulverized coal in a coal-fired power plant according to claim 4, characterized in that: A first sensing electrode and a second sensing electrode are arranged in the box (18); the first sensing electrode and the second sensing electrode are respectively embedded in the side wall of the box (18) at a distance from each other; and two guide plates (32) are fixedly mounted on the inner walls on the left and right sides of the box (18); The first sensing electrode comprises a first metal electrode (33), the first metal electrode (33) is fixedly mounted on the inner wall of the box (18) via a fixing seat (34), the outer wall of the first metal electrode (33) is provided with a first insulating protective layer (35), and the first electrode terminal (37) is fixedly connected to one end of the first metal electrode (33) via a first insulating block (36); The second sensing electrode comprises a second metal electrode (38), the second metal electrode (38) being fixedly mounted on the inner wall of the box body (18) via a second fixing seat (39), the outer side wall of the second metal electrode (38) being provided with a second insulating protective layer (40), and the second electrode terminal (42) being fixedly connected to one end of the second metal electrode (38) via a second insulating block (41).

7. The device for online measuring fineness of pulverized coal in a pulverized pipe of a coal-fired power plant according to claim 6, characterized in that: The invention also comprises a shell (43), wherein the shell (43) is fixedly mounted on the outer wall of the box (18), a signal acquisition unit (44) is located in the shell (43), and the signal acquisition unit (44) is fixedly mounted on the side wall of the box (18), a signal operation analysis unit (45) is fixedly mounted on the inner wall of the shell (43), and the first electrode terminal (37), the second electrode terminal (42), the signal acquisition unit (44) and the signal operation analysis unit (45) are electrically connected.

8. The device for online measuring fineness of pulverized coal in a coal-fired power plant according to claim 1, characterized in that: The invention also comprises a coal powder concentration detection device, which is used for real-time detection of the concentration of the transported coal powder in the process of detecting the fineness of the coal powder inside the coal powder pipeline (3) by the coal-fired power plant powder pipe coal powder fineness online measurement device. The coal powder concentration detection device comprises: An electromagnetic wave transmission flow meter is used to detect the amount of pulverized coal supplied in a pulverized coal pipeline (3) per unit time; A temperature sensor for detecting the temperature inside the pulverized coal pipeline (3) when the pulverized coal is being transported; A pressure sensor for detecting the pressure inside the pulverized coal pipeline (3) when the pulverized coal is being transported; A gas density sensor for detecting the density of the air inside the pulverized coal pipeline (3); A controller and an alarm, wherein the controller is electrically connected to an electromagnetic wave transmission flow meter, a temperature sensor, a pressure sensor, a gas density sensor and an alarm, and the controller controls the operation of the alarm based on the electromagnetic wave transmission flow meter, the temperature sensor, the pressure sensor and the gas density sensor.

9. The device for online measuring fineness of pulverized coal in a pulverized pipe of a coal-fired power plant according to claim 8, characterized in that: The controller controls the alarm based on the electromagnetic wave transmission flowmeter, the temperature sensor, the pressure sensor and the gas density sensor to work as follows: According to the formula and the detection values ​​obtained by the electromagnetic wave transmission flowmeter, the temperature sensor, the pressure sensor and the gas density sensor, the concentration of the coal powder transported by the coal-fired power plant pulverized coal fineness online measurement device during the detection of the coal powder fineness inside the coal powder pipeline (3) is calculated, and the controller compares the concentration C of the coal powder transported during the current coal powder fineness detection process inside the coal powder pipeline (3) with the preset concentration range of the coal powder transported inside the coal powder pipeline (3). If the concentration C of the coal powder transported during the current coal powder fineness detection process inside the coal powder pipeline (3) is not within the preset concentration range of the coal powder transported inside the coal powder pipeline (3), the controller controls the alarm to sound an alarm: Wherein, C is the concentration of the coal powder transported during the coal powder fineness detection process inside the coal powder pipeline (3), Q is the detection value of the amount of coal powder supplied in the coal powder pipeline (3) per unit time by the electromagnetic wave transmission flowmeter, d is the diameter of the coal powder pipeline (3), k is the proportionality coefficient between the flow rate of the coal powder pipeline (3) when transporting coal powder and the pipeline pressure, T is the detection value of the internal temperature of the coal powder pipeline (3) when transporting coal powder by the temperature sensor, P is the detection value of the internal pressure of the coal powder pipeline (3) when transporting coal powder by the pressure sensor, and θ is the detection value of the air density inside the coal powder pipeline (3) by the gas density sensor.

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