A test device for pulverized coal boiler pulverizing system

Abstract

The present invention relates to the field of boilers, and discloses a test device for a pulverized coal boiler pulverizing system, comprising a coal mill forming a primary air circulation loop, an adjustable shrinkage structure, a dust collector, a fan with adjustable air volume and a heater, and also comprising a powder storage bin, a regulating valve group, a powder dropping valve, a primary wind speed measuring component, a temperature sensor and a pulverized coal quantity measuring component. The test device for a pulverized coal boiler pulverizing system of the present invention can simulate the operation of a pulverized coal boiler pulverizing system to monitor the primary wind speed during the operation of the pulverized coal boiler pulverizing system, and can study the pulverized coal concentration, pulverized coal fineness, the best measurement method of the primary wind speed and the influencing factors under the premise of eliminating external interference factors; at the same time, the test device for a pulverized coal boiler pulverizing system can also be used as a verification system for the primary wind measurement method; the test device for a pulverized coal boiler pulverizing system has the advantages of small footprint, low energy consumption, high similarity with the actual pulverized coal boiler pulverizing system, and reduced test and research costs.

Description

Technical Field

[0001] The invention relates to the field of boilers, and in particular to a test device for a pulverized coal boiler pulverizing system. Background Art

[0002] A boiler is an energy conversion device that converts the thermal energy generated by coal into steam kinetic energy. It is also an important production equipment for power generation companies. Whether it can operate stably and efficiently will directly affect the safety and economy of coal-fired power plants.

[0003] In order to better meet production and practical needs, the equipment needs to be continuously improved in practical applications. There is no test system in the prior art that can be used to measure parameters such as coal powder fineness, coal powder concentration deviation, primary wind speed, etc., and there is no test system for studying coal mill power field test, distributor uniformity test and shrinkage linear test.

[0004] If the coal powder fineness, coal powder concentration and primary wind speed are directly measured on the actual operating equipment, the parameter measurement will be inaccurate due to the influence of various interference factors, which is not conducive to the research and experiment of coal powder fineness measurement method, coal powder concentration measurement method and primary wind speed measurement method, and is not conducive to the study of the relationship between related parameters and structures, such as the relationship between primary wind speed, wind pressure, coal powder fineness, coal powder concentration and the structure of the coal mill, distributor and coal mill wind ring. Moreover, if some structures in the pulverizing system are improved or the measurement methods of related parameters are improved, and they are directly applied to actual application equipment without experimental research through the test system, the cost and risk are also high.

[0005] Therefore, there is an urgent need for a pulverized coal boiler pulverizing system test device to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide a test device for a pulverized coal boiler pulverizing system, which can study the influence between relevant parameters and structures of the pulverized coal boiler pulverizing system and the measurement method of relevant parameters.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] A test device for a pulverized coal boiler pulverizing system includes a coal mill forming a primary air circulation loop, an adjustable shrinkage structure, a dust collector, a fan with adjustable air volume, and a heater, and also includes:

[0009] A powder storage bin is arranged below the dust collector and above the coal mill;

[0010] A regulating valve group, wherein the regulating valve group is capable of disconnecting at least one of the coal powder conveying port at the bottom of the dust collector and the coal powder inlet at the top of the powder storage bin, and the coal powder conveying port at the bottom of the dust collector and the coal powder inlet of the coal mill;

[0011] A powder dropping valve, which can selectively connect or disconnect the coal powder outlet at the bottom of the coal powder storage bin with the coal powder inlet of the coal mill;

[0012] A primary wind speed measuring component, wherein a primary wind speed measuring point is provided on the primary wind circulation loop, and the primary wind speed measuring component is used to measure the primary wind speed at the primary wind speed measuring point, and the coal mill, the primary wind speed measuring point and the dust collector are arranged in sequence along the primary wind flow direction;

[0013] A temperature sensor, wherein the temperature sensor is arranged at the air and powder outlet of the coal mill;

[0014] The pulverized coal quantity measuring component is used to measure the amount of pulverized coal delivered into the coal mill via the pulverized coal storage bin.

[0015] The present invention also provides a test device for a pulverized coal boiler pulverizing system, comprising a coal mill forming a primary air circulation loop, an adjustable shrinkage structure, a dust collector, a fan with adjustable air volume, and a heater, and further comprising:

[0016] A powder storage bin is arranged below the dust collector and above the coal mill;

[0017] A regulating valve group, wherein the regulating valve group can disconnect at least one of the coal powder conveying port at the bottom of the dust collector and the coal powder inlet at the top of the powder storage bin, and the horizontal pipe connecting the air powder outlet of the coal mill and the primary air powder pipe of the dust collector and the coal powder conveying port at the bottom of the dust collector;

[0018] A powder dropping valve, which can selectively connect or disconnect the coal powder outlet at the bottom of the coal powder storage bin with the coal powder inlet of the coal mill;

[0019] A primary wind speed measuring component, wherein a primary wind speed measuring point is provided on the primary wind circulation loop, and the primary wind speed measuring component is used to measure the primary wind speed at the primary wind speed measuring point, and the coal mill, the primary wind speed measuring point and the dust collector are arranged in sequence along the primary wind flow direction;

[0020] A temperature sensor, wherein the temperature sensor is arranged at the air and powder outlet of the coal mill;

[0021] The pulverized coal quantity measuring component is used to measure the amount of pulverized coal delivered into the coal mill via the pulverized coal storage bin.

[0022] As an optimal technical solution for the above-mentioned pulverized coal boiler pulverizing system test device, it also includes a coal powder fineness measuring component. A coal powder fineness measuring point is provided on the primary air circulation loop. The coal powder fineness measuring component is used to measure the coal powder fineness at the coal powder fineness measuring point. The pulverizer, the coal powder fineness measuring point and the dust collector are arranged in sequence along the primary air flow direction.

[0023] As a preferred technical solution of the above-mentioned pulverized coal boiler pulverizing system test device, the pulverized coal fineness measuring point is arranged on a vertically arranged pipeline.

[0024] As a preferred technical solution for the above-mentioned pulverized coal boiler pulverizing system test device, the primary wind speed measuring point is arranged on a horizontally arranged pipeline.

[0025] As an optimal technical solution for the above-mentioned pulverized coal boiler pulverizing system test device, it also includes a distributor arranged at the air-powder outlet on the coal mill, and the air-powder outlet of the distributor is arranged in a one-to-one correspondence with the adjustable shrinkage hole structure and the primary wind speed measurement component. Each air-powder outlet of the distributor delivers the air-powder mixture to the same dust collector through the corresponding primary air-powder pipe.

[0026] As a preferred technical solution of the above-mentioned pulverized coal boiler pulverizing system test device, it also includes an air ring arranged at the primary air inlet of the pulverizer, and a pulverized coal concentration measurement component;

[0027] A coal powder concentration measuring point is provided on the primary air circulation loop, and the coal powder concentration measuring component is used to measure the coal powder concentration at the coal powder concentration measuring point. The coal mill, the coal powder concentration measuring point and the dust collector are arranged in sequence along the primary air flow direction.

[0028] As a preferred technical solution of the above-mentioned pulverized coal boiler pulverizing system test device, the pulverized coal concentration measuring point is set on a vertically arranged pipeline.

[0029] As an optimal technical solution for the above-mentioned pulverized coal boiler pulverizing system test device, it also includes a power field test component installed in the coal mill, and the inner wall of the cylinder of the coal mill is provided with multiple wind-powder velocity measuring points, and the power field test component is used to measure the wind-powder velocity at each of the wind-powder velocity measuring points.

[0030] As a preferred technical solution of the above-mentioned pulverized coal boiler pulverizing system test device, it also includes a wind speed measurement component for measuring the outlet wind speed of the adjustable shrinkage hole structure.

[0031] Beneficial effects of the invention: The invention provides a pulverized coal boiler pulverizing system test device, which simulates the operation of the pulverized coal boiler pulverizing system, thereby monitoring the primary wind speed during the operation of the pulverized coal boiler pulverizing system, and can eliminate external interference factors. At the same time, the above-mentioned pulverized coal boiler pulverizing system test device can also be used as a test system for the primary wind measurement method; the pulverized coal boiler pulverizing system test device provided by the invention has the advantages of small footprint, low energy consumption, high similarity with the actual pulverized coal boiler pulverizing system, and reduced testing and research costs.

[0032] When the pulverized coal boiler pulverizing system test device provided by the present invention is used to conduct hot pulverized coal test research, since the entire test device does not involve a combustion system, no pollutants are generated and the environmental protection performance is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0034] Figure 1 It is a structural schematic diagram of a powder boiler powder making system test device provided in the first embodiment of the present invention;

[0035] Figure 2 It is a structural schematic diagram of a powder boiler powder making system test device provided in Example 2 of the present invention.

[0036] In the figure:

[0037] 1. Coal mill; 2. Adjustable shrinkage structure; 3. Dust collector; 4. Fan; 5. Heater; 6. Powder storage bin; 7. Regulating valve group; 8. Powder dropping valve; 9. Coal powder fineness measuring point; 10. Primary wind speed measuring point. DETAILED DESCRIPTION

[0038] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further explained below in conjunction with the accompanying drawings and through specific implementation methods. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the sake of ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all. For example: a plurality of primary air and powder pipes arranged in parallel are provided between the air and powder outlet of the coal mill and the inlet of the dust collector to simulate different types of powder making systems. To avoid overly complex graphics, the specification is attached. Figure 1 And the instruction manual Figure 2 Only one pipeline is used in the illustration.

[0039] Embodiment 1

[0040] The present embodiment provides a test device for a pulverized coal boiler pulverizing system. The present embodiment takes a direct-blowing pulverizing system as an example to explain in detail the test device for a pulverized coal boiler pulverizing system.

[0041] Figure 1 Schematic diagram of the structure of the powder boiler powder making system test device provided in this embodiment. Figure 1 As shown, the pulverized coal boiler pulverizing system test device includes a coal mill 1 forming a primary air circulation loop, an adjustable shrinkage structure 2, a dust collector 3, a fan 4 with adjustable air volume, and a heater 5. The primary air sent into the coal mill 1 is heated by the heater 5, and the air-powder mixture flowing out of the air-powder outlet of the coal mill 1 is filtered by the dust collector 3, and the filtered primary air is sent back into the coal mill 1 through the fan 4. Preferably, the air-powder outlet of the coal mill 1 is arranged at the top of the coal mill 1.

[0042] The above-mentioned pulverized coal boiler pulverizing system test device also includes a pulverized coal storage bin 6, a regulating valve group 7 and a pulverized coal valve 8, wherein the pulverized coal storage bin 6 is arranged below the dust collector 3 and above the coal mill 1; the regulating valve group 7 can make the pulverized coal conveying port at the bottom of the dust collector 3 and at least one of the pulverized coal inlet at the top of the pulverized coal storage bin 6 and the pulverized coal inlet of the coal mill 1 in a disconnected state; the pulverized coal valve 8 can make the pulverized coal outlet at the bottom of the pulverized coal storage bin 6 selectively connected or disconnected with the pulverized coal inlet of the coal mill 1. In this embodiment, the pulverized coal inlet of the coal mill 1 is provided with a pulverized coal main pipe with one end extending into the coal mill 1, and the end of the pulverized coal main pipe extending out of the coal mill 1 is connected with a first pulverized coal branch pipe and a second pulverized coal branch pipe, wherein the first pulverized coal branch pipe is connected with the pulverized coal outlet at the bottom of the pulverized coal storage bin 6, the pulverized coal valve 8 is arranged on the first pulverized coal branch pipe, and the second pulverized coal branch pipe is connected with the pulverized coal conveying port at the bottom of the dust collector 3. Preferably, the pulverized coal inlet of the coal mill 1 is arranged at the top of the coal mill 1.

[0043] In this embodiment, the regulating valve group 7 is a reversing valve. In other embodiments, the regulating valve group 7 may be two switch valves.

[0044] During the operation of the pulverized coal boiler pulverizing system test device, in order to prevent the air-powder circulation from affecting the pulverized coal falling into the coal mill 1 through the pulverizing main pipe, in this embodiment, an air lock is provided in the pulverizing main pipe to prevent the air-powder mixture from flowing out of the coal mill 1 through the pulverizing main pipe, thereby affecting the pulverized coal falling into the coal mill 1 through the pulverizing main pipe. The structure of the air lock is prior art and will not be described in detail here.

[0045] In the cold state, the motor of the coal mill 1 is running, but the primary air inlet and the air-powder outlet of the coal mill 1 are both open; the dust collector 3 and the heater 5 are both powered off and do not work; the coal powder conveying port at the bottom of the dust collector 3 is disconnected from the coal powder inlet at the top of the powder storage bin 6 and the coal powder inlet of the coal mill 1 through the regulating valve group 7; the coal powder outlet at the bottom of the powder storage bin 6 is disconnected from the coal powder inlet of the coal mill 1 through the powder dropping valve 8; the fan 4 is working, and the primary air circulates in the above-mentioned primary air circulation loop.

[0046] In the hot state, the coal mill 1, the dust collector 3 and the heater 5 are all working, and the primary air inlet and the air-powder outlet of the coal mill 1 are all open; the coal powder conveying port at the bottom of the dust collector 3 is disconnected from the coal powder inlet at the top of the powder storage bin 6 through the regulating valve group 7, and is connected to the coal powder inlet of the coal mill 1; the coal powder outlet at the bottom of the powder storage bin 6 is connected to the coal powder inlet of the coal mill 1 through the powder dropping valve 8, and the coal powder in the powder storage bin 6 enters the coal mill 1 through the coal powder outlet at the bottom thereof and the coal powder inlet of the coal mill 1. At the same time, the fan 4 is working, so that the primary air-powder mixture flows out through the air-powder outlet of the coal mill 1, and the coal powder in the air-powder mixture is filtered through the dust collector 3, and the filtered coal powder is sent back to the coal powder inlet of the coal mill 1 through the coal powder conveying port at the bottom of the dust collector 3, and the filtered primary air is sent to the heater 5 through the fan 4 for heating, and then sent back to the coal mill 1 through the primary air inlet of the coal mill 1.

[0047] Before the coal mill 1 stops working, the coal powder outlet at the bottom of the powder storage bin 6 is disconnected from the coal powder inlet of the coal mill 1 through the powder falling valve 8, and the coal powder conveying port at the bottom of the dust collector 3 is connected to the coal powder inlet at the top of the powder storage bin 6 through the regulating valve group 7, and is disconnected from the coal powder inlet of the coal mill 1. Through the continuous circulation of the primary air, the coal powder is continuously passed through the dust collector 3 and falls back into the powder storage bin 6, so as to avoid the residual coal powder in the coal mill 1 and the dust collector 3 affecting the reuse after the coal mill 1 and the dust collector 3 stop working.

[0048] In order to measure the primary wind speed in the primary air-powder pipe connected to the air-powder outlet of the coal mill, the coal-powder boiler pulverizing system test device provided in this embodiment also includes a primary wind speed measurement component, a primary wind speed measurement point 10 is provided on the primary air circulation loop, and the primary wind speed measurement component is used to measure the primary wind speed of the primary wind speed measurement point 10. The coal mill 1, the primary wind speed measurement point 10 and the dust collector 3 are sequentially arranged along the primary air flow direction. Preferably, the primary wind speed measurement point 10 is arranged on a horizontally arranged pipeline. It is found through experiments that the accuracy of the measurement can be improved by arranging the primary wind speed measurement point 10 on a horizontally arranged pipeline.

[0049] In order to study the relationship between the primary air speed and the primary air temperature, the pulverized coal boiler pulverizing system test device provided in this embodiment also includes a temperature sensor, which is arranged on the primary air pulverizing pipe connected to the air pulverizing outlet of the coal mill 1.

[0050] The pulverized coal boiler pulverizing system test device provided in this embodiment further includes a pulverized coal measuring component, which is used to measure the amount of pulverized coal fed into the coal mill 1 via the pulverized coal storage bin 6. The pulverized coal measuring component can use a weight sensor to measure the amount of pulverized coal flowing out of the pulverized coal outlet of the pulverized coal storage bin 6. Since the shape and volume of the pulverized coal storage bin 6 are determined, the amount of pulverized coal can also be calculated based on the height of the pulverized coal falling in the pulverized coal storage bin 6, which is not limited here.

[0051] Furthermore, the air-powder outlet of the coal mill 1 is provided with a distributor, and the air-powder outlet of the distributor corresponds to the adjustable shrinkage hole structure 2 and the primary wind speed measurement component one by one, and each air-powder outlet of the distributor respectively delivers the air-powder mixture to the same dust collector 3 through the corresponding primary air-powder pipe. As for the specific structures of the adjustable shrinkage hole structure 2 and the distributor, they are all prior arts and will not be described here.

[0052] The process of using the above-mentioned pulverized coal boiler pulverizing system test device to perform the next wind speed leveling in the cold state is as follows:

[0053] The primary wind speed of the corresponding primary wind speed measuring point 10 is measured by the primary wind speed measuring component, and the average of the primary wind speeds in all primary wind powder tubes is obtained, which is recorded as the cold average primary wind speed. It is required that the difference between the primary wind speed of any primary wind speed measuring point 10 on the primary wind powder tube in the cold state and the cold average primary wind speed is within the allowable error range, and the allowable error range can be set to ±5% or other values. The primary wind speed of each primary wind speed measuring point 10 can be adjusted to meet the requirements by adjusting the adjustable shrinkage structure 2, and the primary wind speed leveling under different air volumes can be simulated by adjusting the rotation speed of the fan 4.

[0054] The process of using the above-mentioned pulverized coal boiler pulverizing system test device to perform the next wind speed leveling in the hot state is as follows:

[0055] The coal mill 1, the dust collector 3 and the heater 5 are all working, and the primary air inlet and the air-powder outlet of the coal mill 1 are both open; after the primary air temperature measured by the temperature sensor reaches the first preset temperature, the coal powder conveying port at the bottom of the dust collector 3 is disconnected from the coal powder inlet at the top of the powder storage bin 6 through the regulating valve group 7, and is connected to the coal powder inlet of the coal mill 1; the coal powder outlet at the bottom of the powder storage bin 6 is connected to the coal powder inlet of the coal mill 1 through the powder dropping valve 8, and the coal powder in the powder storage bin 6 enters the coal mill 1 through the coal powder outlet at the bottom thereof and the coal powder inlet of the coal mill 1, and at the same time, the fan 4 works, so that the primary air-powder mixture flows out through the air-powder outlet of the coal mill 1, and the coal powder in the air-powder mixture is filtered through the dust collector 3, and the filtered coal powder is sent to the coal powder inlet of the coal mill 1 again through the coal powder conveying port at the bottom of the dust collector 3, and the filtered primary air is sent to the heater 5 through the fan 4 for heating, and then sent to the coal mill 1 again through the primary air inlet of the coal mill 1.

[0056] In this process, the air volume provided by the fan 4 and the amount of pulverized coal delivered to the coal mill 1 by the pulverized coal storage bin 6 are required to meet the proportional requirements. After the above-mentioned hot primary air circulation process is stable, the average value of the primary wind speed in all primary air powder pipes is obtained, which is recorded as the hot average primary wind speed. It is required that the difference between the primary wind speed of any primary wind speed measuring point 10 on the primary air powder pipe in the hot state and the hot average primary wind speed is within the allowable error range, and the allowable error range can be set to ±10% or other values. The adjustable shrinkage structure 2 can be adjusted to make the primary wind speed of each primary wind speed measuring point 10 meet the requirements, and the primary wind speed leveling under different air volumes can be simulated by adjusting the rotation speed of the fan 4.

[0057] The above-mentioned pulverized coal boiler pulverizing system test device can also be used as a test system for a primary wind speed measurement method, and can also be used for teaching and training.

[0058] In order to measure the fineness of coal powder, the coal powder boiler pulverizing system test device provided in this embodiment also includes a coal powder fineness measuring component, a coal powder fineness measuring point 9 is provided on the primary air circulation loop, and the coal powder fineness measuring component is used to measure the coal powder fineness at the coal powder fineness measuring point 9. The coal mill 1, the coal powder fineness measuring point 9 and the dust collector 3 are sequentially arranged along the primary air flow direction. As for the specific structure of the coal powder fineness measuring component and how to measure the coal powder fineness through the coal powder fineness measuring component, they are all existing technologies and will not be described in detail here.

[0059] Preferably, the coal powder fineness measuring point 9 is arranged on a vertically arranged pipeline. It is found through experiments that arranging the coal powder fineness measuring point 9 on a vertically arranged pipeline can improve the measurement accuracy.

[0060] The specific process of measuring the fineness of variable coal powder using the above-mentioned pulverized coal boiler pulverizing system test device is as follows: in the hot state, after the above-mentioned hot primary air circulation process is stable, record the measurement data such as coal powder fineness, primary air speed, and primary air temperature. Then, the coal powder outlet at the bottom of the powder storage bin 6 is disconnected from the coal powder inlet of the coal mill 1 through the powder dropping valve 8, and the coal powder stops entering the coal mill 1. At the same time, the coal powder conveying port at the bottom of the dust collector 3 is connected to the coal powder inlet at the top of the powder storage bin 6 through the regulating valve group 7, and is disconnected from the coal powder inlet of the coal mill 1. After time t, all the coal powder in the primary air circulation system is collected in the powder storage bin 6. Then, replace the powder storage bin 6 with coal powder of different fineness, or clean the coal powder in the powder storage bin 6, load coal powder of different fineness, and repeat the above test process.

[0061] The above-mentioned pulverized coal boiler pulverizing system test device can also be used as a test system for the pulverized coal fineness measurement method.

[0062] In order to measure the pulverized coal concentration, the pulverized coal boiler pulverizing system test device provided in this embodiment also includes an air ring arranged at the primary air inlet of the coal mill 1, and a pulverized coal concentration measuring component; a pulverized coal concentration measuring point is arranged on the primary air circulation loop, and the pulverized coal concentration measuring component is used to measure the pulverized coal concentration at the pulverized coal concentration measuring point, and the coal mill 1, the pulverized coal concentration measuring point and the dust collector 3 are arranged in sequence along the primary air flow direction. As for the specific structure of the pulverized coal concentration measuring component and how to measure the pulverized coal concentration through the pulverized coal concentration measuring component, they are all prior art and will not be described in detail here.

[0063] Preferably, the coal powder concentration measuring point is arranged on a vertically arranged pipeline. It is found through experiments that arranging the coal powder concentration measuring point on a vertically arranged pipeline can improve the measurement accuracy.

[0064] The specific process of measuring the pulverized coal concentration using the above-mentioned pulverized coal boiler pulverizing system test device is as follows: in the hot state, after the above-mentioned primary air circulation process is stable, sampling and measurement are performed at the pulverized coal concentration measuring point through the pulverized coal concentration measurement component, so that the online test of the pulverized coal concentration can be realized.

[0065] The above-mentioned pulverized coal boiler pulverizing system test device can also be used as a test system for the pulverized coal concentration measurement method.

[0066] In order to test the segregation wind speed of the primary wind under a certain wind-powder concentration, this embodiment can test the segregation wind speed of the pulverizing system. Specifically, after establishing the hot-state pulverized coal cycle, record the amount of coal powder input, measure the primary wind speed and coal powder concentration as the reference value. Reduce the primary wind speed to a certain value, repeat the primary wind speed and coal powder concentration, and compare them with the reference coal powder concentration. The wind speed when the deviation between the two reaches the segregation degree is the critical segregation wind speed.

[0067] The above-mentioned pulverized coal boiler pulverizing system test device can be used to carry out a uniformity test of the distributor. The specific process is as follows: in the hot state, after the primary air circulation process is stable, the primary wind speed, coal powder concentration, and coal powder fineness in the primary air-powder pipe are measured. By analyzing the measured data, it can be determined whether the air-powder mixture discharged from each air-powder outlet of the distributor is uniform. In addition, the relevant data is measured after changing parameters such as the primary wind speed and primary air temperature to understand the relationship between the uniformity of the distributor and parameters such as the primary wind speed, coal powder concentration, and primary air temperature.

[0068] The above-mentioned pulverized coal boiler pulverizing system test device can also be used as a test system for improving the distributor structure to improve the structure of the distributor and improve the uniformity of the distributor.

[0069] In order to conduct experimental research on the power field of the coal mill 1, the above-mentioned pulverized coal boiler pulverizing system test device also includes a power field test component installed in the coal mill 1. The inner wall of the cylinder of the coal mill 1 is provided with multiple air-powder velocity measuring points, and the power field test component is used to measure the air-powder velocity at each air-powder velocity measuring point.

[0070] The specific process of conducting the power field test of the coal mill 1 using the above-mentioned pulverized coal boiler pulverizing system test device is as follows:

[0071] In the cold state, after a wind circulation process is stable, the wind and powder speed at each wind and powder speed measuring point is measured by the power field test component. In the hot state, after a wind circulation process is stable, the wind and powder speed at each wind and powder speed measuring point is measured by the power field test component.

[0072] After repeated tests, the relationship between the position of the air-powder velocity measuring point and the air-powder velocity can be analyzed based on the measured data. The above-mentioned pulverized coal boiler pulverizing system test device can also be used as a test system for improving the structure of the coal mill 1 to improve the structure of the coal mill 1 and improve the power field performance or other performance of the coal mill 1.

[0073] In order to conduct a linear test on shrinkage, the above-mentioned pulverized coal boiler pulverizing system test device further includes a wind speed measuring component for measuring the outlet wind speed of the adjustable shrinkage structure 2. The above-mentioned wind speed measuring component is a backrest tube wind speed measuring device, and its specific structure is prior art and can be obtained through external purchase, and is not specifically limited here.

[0074] The specific process of the shrinkage linear test using the above-mentioned pulverized coal boiler pulverizing system test device is as follows: in the cold state, after the cold primary air circulation process is stable, the static pressure in front of the shrinkage structure 2 is maintained unchanged, and the outlet wind speed of the adjustable shrinkage structure 2 at different openings is measured. In the hot state, after the hot primary air circulation process is stable, the outlet wind speed of the adjustable shrinkage structure 2 at different openings is measured by the wind speed measurement component.

[0075] The linear relationship between the opening size of the adjustable shrinkage structure 2 and the outlet wind speed can be analyzed through the above shrinkage linear test data. The outlet wind speed of the adjustable shrinkage structure 2 under different wind volumes, wind pressures or coal powder concentrations can also be measured by the wind speed measurement component in cold and hot states to study the relationship between the adjustment performance of the adjustable shrinkage structure 2 and the wind volume, wind speed and coal powder concentration.

[0076] The above-mentioned pulverized coal boiler pulverizing system test device can also be used as a test system for improving the adjustable shrinkage structure 2 to improve the adjustable shrinkage structure 2 and improve the linear relationship between the opening size of the adjustable shrinkage structure 2 and its outlet wind speed.

[0077] It should be pointed out that the amount of pulverized coal in this embodiment refers to the mass of the pulverized coal.

[0078] The pulverized coal boiler pulverizing system test device provided in this embodiment can simulate the operation of the pulverized coal boiler pulverizing system, so as to monitor the primary wind speed, coal powder fineness and coal powder concentration during the operation of the pulverized coal boiler pulverizing system, and can study the relationship between the primary wind speed and the primary wind temperature, coal powder concentration, coal powder fineness and other parameters under the premise of eliminating external interference factors; at the same time, the above-mentioned pulverized coal boiler pulverizing system test device can also be used as a test system for the primary wind measurement method, coal powder concentration measurement method and coal powder fineness measurement method; the above-mentioned pulverized coal boiler pulverizing system test device can also be used to carry out a wind speed leveling test to simulate a primary wind speed leveling test under different wind volumes. The secondary wind speed can be leveled; the uniformity of the distributor can also be studied to study the relationship between the uniformity of the distributor and parameters such as the primary wind speed and the primary wind temperature, and to improve the structure of the distributor; a coal mill power field test can also be carried out to improve the structure of the coal mill 1; a shrinkage linear test can also be carried out to study the linear relationship between the opening size of the adjustable shrinkage structure 2 and its outlet wind speed, and in cold and hot states, the wind speed at the air-powder outlet of the adjustable shrinkage structure 2 under different air volumes or different wind pressures or different coal powder concentrations is measured by a wind speed measuring component to study the relationship between the adjustment performance of the adjustable shrinkage structure 2 and the air volume, wind speed and coal powder concentration.

[0079] When the above-mentioned pulverized coal boiler pulverizing system test device is used to conduct hot pulverized coal test research, since the entire test device does not involve a combustion system, no pollutants will be generated, which is energy-saving and environmentally friendly.

[0080] The pulverized coal boiler pulverizing system test device provided in this embodiment has the advantages of small footprint, low energy consumption, and high similarity to the actual pulverized coal boiler pulverizing system, thereby greatly reducing the cost of testing and research, and improving the reliability of various parameter measurements, structural improvements, parameter measurement methods and other experimental research.

[0081] Embodiment 2

[0082] The difference between this embodiment and the first embodiment is that this embodiment takes the intermediate storage type pulverizing system in the prior art as an example to provide a test device for a pulverized coal boiler pulverizing system. Figure 2 is a schematic diagram of the structure of the test device for the pulverized coal boiler pulverizing system provided in this embodiment. Specifically, Figure 2As shown, a distributor outlet is provided at the top of the coal mill 1, and the distributor outlet is connected to a primary air powder pipe. The primary air powder pipe includes a vertical pipe connected to the air powder outlet of the coal mill 1, a horizontal pipe connected to the vertical pipe at one end, and a connecting pipe connecting the horizontal pipe and the dust collector 3. The coal powder outlet at the bottom of the dust collector 3 is connected to the horizontal pipe through a second powder falling branch pipe. A detachable first powder distributor is provided at the connection between the second powder falling branch pipe and the horizontal pipe to evenly send the coal powder falling through the second powder falling branch pipe into each primary air powder pipe to participate in the primary air circulation; one end of the first powder falling branch pipe is connected to the coal powder outlet at the bottom of the powder storage bin 6, and the other end is connected to a second powder distributor. The second powder distributor is provided with a plurality of outlets corresponding to the primary air powder pipes one by one, and each outlet is respectively connected to a vertical pipe of a primary air powder pipe to send the coal powder into the coal mill 1 through the vertical pipe. The structures of the above-mentioned first powder distributor and the second powder distributor are both prior art, and will not be described here.

[0083] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

[0084] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0085] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A test device for a pulverized coal boiler pulverizing system, characterized in that: The invention comprises a coal mill (1) forming a primary air circulation loop, an adjustable shrinkage structure (2), a dust collector (3), a fan (4) with adjustable air volume, and a heater (5), and further comprises: A powder storage bin (6) is arranged below the dust collector (3) and above the coal mill (1); a regulating valve group (7), wherein the regulating valve group (7) is capable of disconnecting at least one of the coal powder conveying port at the bottom of the dust collector (3) and the coal powder inlet at the top of the powder storage bin (6), and the coal powder conveying port at the bottom of the dust collector (3) and the coal powder inlet of the coal mill (1); a powder dropping valve (8), wherein the powder dropping valve (8) is capable of selectively connecting or disconnecting the coal powder outlet at the bottom of the coal powder storage bin (6) with the coal powder inlet of the coal mill (1); A primary wind speed measuring component, wherein a primary wind speed measuring point (10) is provided on the primary wind circulation loop, and the primary wind speed measuring component is used to measure the primary wind speed at the primary wind speed measuring point (10), and the coal mill (1), the primary wind speed measuring point (10) and the dust collector (3) are arranged in sequence along the primary wind flow direction; a temperature sensor, the temperature sensor being arranged at an air and powder outlet of the coal mill (1); A pulverized coal quantity measuring component is used to measure the quantity of pulverized coal fed into the coal mill (1) via the pulverized coal storage bin (6).

2. A test device for a pulverized coal boiler pulverizing system, characterized in that: The invention comprises a coal mill (1) forming a primary air circulation loop, an adjustable shrinkage structure (2), a dust collector (3), a fan (4) with adjustable air volume, and a heater (5), and further comprises: A powder storage bin (6) is arranged below the dust collector (3) and above the coal mill (1); a regulating valve group (7), wherein the regulating valve group (7) is capable of disconnecting at least one of the coal powder conveying port at the bottom of the dust collector (3) and the coal powder inlet at the top of the powder storage bin (6), and the horizontal pipe connecting the air powder outlet of the coal mill (1) and the primary air powder pipe of the dust collector (3) and the coal powder conveying port at the bottom of the dust collector (3); a powder dropping valve (8), wherein the powder dropping valve (8) is capable of selectively connecting or disconnecting the coal powder outlet at the bottom of the coal powder storage bin (6) with the coal powder inlet of the coal mill (1); A primary wind speed measuring component, wherein a primary wind speed measuring point (10) is provided on the primary wind circulation loop, and the primary wind speed measuring component is used to measure the primary wind speed at the primary wind speed measuring point (10), and the coal mill (1), the primary wind speed measuring point (10) and the dust collector (3) are arranged in sequence along the primary wind flow direction; a temperature sensor, the temperature sensor being arranged at an air and powder outlet of the coal mill (1); A pulverized coal quantity measuring component is used to measure the quantity of pulverized coal fed into the coal mill (1) via the pulverized coal storage bin (6).

3. The pulverized coal boiler pulverizing system test device according to claim 1 or 2, characterized in that: It also comprises a coal powder fineness measuring component, wherein a coal powder fineness measuring point (9) is provided on the primary air circulation loop, and the coal powder fineness measuring component is used to measure the coal powder fineness at the coal powder fineness measuring point (9), and the coal mill (1), the coal powder fineness measuring point (9) and the dust collector (3) are arranged in sequence along the primary air flow direction.

4. The pulverized coal boiler pulverizing system testing device according to claim 3 is characterized in that: The coal powder fineness measuring point (9) is arranged on a vertically arranged pipeline.

5. The pulverized coal boiler pulverizing system testing device according to claim 1 or 2, characterized in that: The primary wind speed measuring point (10) is arranged on a horizontally arranged pipeline.

6. The pulverized coal boiler pulverizing system testing device according to claim 1 or 2, characterized in that: It also includes a distributor arranged at the air-powder outlet of the coal mill (1), the air-powder outlet of the distributor being arranged in one-to-one correspondence with the adjustable shrinkage hole structure (2) and the primary wind speed measurement component, and each air-powder outlet of the distributor respectively delivers the air-powder mixture to the same dust collector (3) through a corresponding primary air-powder pipe.

7. The pulverized coal boiler pulverizing system testing device according to claim 1 or 2, characterized in that: It also includes an air ring arranged at the primary air inlet of the coal mill (1), and a coal powder concentration measuring component; A coal powder concentration measuring point is provided on the primary air circulation loop, and the coal powder concentration measuring component is used to measure the coal powder concentration at the coal powder concentration measuring point. The coal mill (1), the coal powder concentration measuring point and the dust collector (3) are arranged in sequence along the primary air flow direction.

8. The pulverized coal boiler pulverizing system testing device according to claim 7, characterized in that: The coal powder concentration measuring point is arranged on a vertically arranged pipeline.

9. The pulverized coal boiler pulverizing system testing device according to claim 1 or 2, characterized in that: It also comprises a power field test component installed in the coal mill (1), the inner wall of the drum of the coal mill (1) is provided with a plurality of wind-powder velocity measuring points, and the power field test component is used to measure the wind-powder velocity at each of the wind-powder velocity measuring points.

10. The pulverized coal boiler pulverizing system testing device according to claim 1 or 2, characterized in that: It also comprises a wind speed measuring component, which is used to measure the outlet wind speed of the adjustable shrinkage hole structure (2).

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