Water turbine passing sediment characteristic online monitoring test platform and test method

Abstract

The invention discloses an online monitoring test platform for sediment characteristics of a water turbine passing through a machine, belongs to the technical field of monitoring of sediment of a hydroelectric generating set passing through the machine, provides circulating water flows with different flow velocities and sediment contents, and can be used for testing different types of sediment characteristic online monitoring systems or sensors. The applicability and the accuracy of the system or the sensor under different flow velocity conditions and different sediment concentrations can be checked, and the method can be used for development and calibration of a sediment characteristic on-line monitoring system.

Description

Technical Field

[0001] The invention belongs to the technical field of monitoring sediment passing through a hydropower unit, and specifically relates to an online monitoring test platform and a test method for sediment passing through a turbine. Background Art

[0002] High-speed water flow carrying sand will cause abrasion and wear on the surface of key flow-through parts of turbines, resulting in reduced unit operating efficiency and even threatening the safe operation of turbines. Strengthening the precise online monitoring of sediment concentration in power generation water bodies and the prediction of sediment wear is of great significance to the scientific dispatch of power stations.

[0003] At present, the monitoring methods for the concentration and gradation of sediment passing through turbines are not mature enough. The installation position of the sensor, the range of the sensor, the applicable water flow velocity of the sensor, etc. are all related to the measurement accuracy. In order to ensure the applicability and accuracy of the online monitoring sensor for sediment characteristics applied to the real machine, it is necessary to test the applicable conditions of the sensor through experimental methods. Summary of the invention

[0004] The invention provides an online monitoring test platform and test method for sediment characteristics of a water turbine, which solves the problems in the background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: An online monitoring test platform for sediment characteristics of a hydraulic turbine, comprising: Sand and water circulation system: used to provide circulating water with different flow rates and sand contents; Circulation system automation components: used to monitor the operating parameters of the sand and water circulation system; Electrical control cabinet: used to provide power to the sand and water circulation system and the circulation system automation components; Computer monitoring platform: electrically connected to the electrical control cabinet, used to collect parameters in the circulation system automation components, control the operating parameters of the sand-water circulation system, and display the sediment concentration value in real time; The sand and water circulation system includes a water pool, which is connected to a water outlet pipe and a water inlet pipe, and the water inlet pipe and the water outlet pipe are commonly connected to a variable frequency water pump. The water outlet pipe is sequentially provided with an electromagnetic flowmeter, a sensor installation section, an observation section and an expansion joint, and the expansion joint is close to the variable frequency water pump. An agitator mounting bracket is provided on the top of the water pool, and an agitator is connected to the agitator mounting bracket. The agitator extends into the water pool, and a sampling port is provided on the water outlet pipe. A sediment content monitoring sensor is installed on the sensor installation section.

[0006] The pool is also provided with a drain valve and a water supply valve.

[0007] The circulation system automation components include a pressure sensor, a pressure gauge and a liquid level gauge. The liquid level gauge is arranged in the water pool, and the pressure sensor and the pressure gauge are arranged on the water outlet pipe. The sediment content monitoring sensor is an optical sensing sensor. The sensor is provided with a sealing structure and is connected by a flange. After installation, its sensing end is located on the inner wall of the sensor installation section.

[0008] The variable frequency water pump adopts a vertical structure, and stop valves are installed before and after the variable frequency water pump, and stop valves are also installed at the water inlet pipe and the water outlet pipe of the pool.

[0009] The bottom of the pool is provided with a first sand guide plate and a second sand guide plate, and the outlet pipe entering the pool is provided with an elbow to introduce water flow into the pool, and the elbow angle is 30-60 degrees.

[0010] The stirrer bracket is welded to the side wall of the pool, the stirrer is evenly installed on the bracket, and the height of the stirrer blade is adjustable.

[0011] The electrical control cabinet is equipped with a touch screen and built-in control software. The operating power of the variable frequency water pump is changed by setting the frequency of the variable frequency water pump motor, the circulating water flow test flow is adjusted, and the speed of the agitator is adjusted by setting the frequency of the agitator motor.

[0012] The sampling port is used for manual sampling and analysis of the concentration and gradation of water and sediment flow, and is connected to the sampling system of other sediment online monitoring systems to test the accuracy of sediment online monitoring system products under different working conditions.

[0013] An online monitoring test method for sediment characteristics of a hydraulic turbine, comprising: Install the sediment sensor on the sensor installation section, add test sand into the pool, connect the electrical control cabinet and computer monitoring platform, set the water pump start frequency to the frequency of the first working condition through the electrical control cabinet or computer monitoring platform, then the water system starts to circulate, the sediment sensor senses the water flow in the outlet pipe to obtain sediment concentration data, turn on the agitator to mix the sediment in the pool, monitor the sediment sensor data, and when the data is stable, take out the first group of water samples from the sampling port with a sampling cup, read the flow rate and sediment sensor data at this time, and complete the first working condition test. Test, adjust the starting frequency of the variable frequency water pump to the second operating condition frequency, and conduct the second operating condition test in the same way. After completing all the tests, use the drying method or specific gravity method to measure the total weight / volume, dry the sediment and weigh the dry sand of each group of water samples, calculate the average sediment concentration of each group, compare the sampling concentration with the average concentration collected by the sensor, and obtain the sensor error under operating condition 1. Use the same method to obtain the sensor error under other flow rate conditions, change the sediment concentration of the pool, repeat the above test, and obtain the sensor error under the new concentration.

[0014] Preferably, the method further includes connecting the sampling port to the sampling interface of the sediment online monitoring system product to calibrate the sediment online monitoring system product, specifically including: Connect the electrical control cabinet and computer monitoring platform, set the variable frequency water pump start frequency to the predetermined working frequency, start the water system circulation, turn on the agitator, stir the sediment in the pool, monitor the sediment online monitoring system product data, and when the data is stable, take out the water sample from the sampling port, read the flow rate and sediment online monitoring system product data at this time, adjust the variable frequency water pump start frequency to the next working frequency, repeat the above steps to conduct the next working condition test, and after completing all the tests, use the drying method or specific gravity method to measure the total weight / volume, sediment sediment drying, and dry sand weighing for each group of water samples, calculate the average sediment concentration of each group, compare the sampled concentration with the average concentration collected by the sensor, and obtain the concentration error of the sediment online monitoring system product under each working condition. At the same time, each group of water samples is tested for sediment gradation on a standard laser particle size analyzer to obtain the gradation error of the sediment online monitoring system product under each working condition.

[0015] Compared with the prior art, the present invention has the following beneficial effects: the present invention provides an online monitoring test platform for sediment characteristics passing through a turbine, provides circulating water flows with different flow rates and sediment contents, can test different types of online monitoring systems or sensors for sediment characteristics, and verify the applicability and accuracy of the systems or sensors under different flow rate conditions and different sediment concentrations, and can be used for the development and calibration of online monitoring systems for sediment characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a plan view of the layout of the on-line monitoring test platform for sediment characteristics of a hydraulic turbine according to the present invention; Figure 2 It is a left view of the plan layout of the on-line monitoring test platform for sediment characteristics passing through a water turbine according to the present invention; Figure 3 It is a top view of the plane layout of the on-line monitoring test platform for sediment characteristics passing through a water turbine according to the present invention; Figure 4 This is a system diagram of an online monitoring test platform for sediment characteristics passing through a water turbine according to the present invention; Figure 5 This is a schematic diagram of the installation of the sediment sensor of the present invention; Figure 6 This is a sampling diagram for the test of the present invention.

[0017] In the figure: 1-water tank; 2-water outlet pipe; 3-water inlet pipe; 4-observation section; 5-frequency conversion water pump; 6-sensor installation section; 7-electromagnetic flowmeter; 8-drain valve; 9-water supply valve; 10-stop valve; 11-expansion joint; 12-agitator; 13-agitator mounting bracket; 14-pressure sensor; 15-pressure gauge; 16-liquid level sensor; 17-large sand guide plate; 18-small sand guide plate; 19-electrical control cabinet; 20-computer monitoring platform; 21-sediment content monitoring sensor; 22-sampling cup; 23-sediment online monitoring system product, 24-sampling port, 25-power supply. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0021] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply 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 a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0022] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 connection 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.

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0025] like Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides an online monitoring test platform for sediment characteristics of a hydraulic turbine, comprising: Sand and water circulation system: used to provide circulating water with different flow rates and sand contents; Circulation system automation components: used to monitor the operating parameters of the sand and water circulation system; Electrical control cabinet 19: used to provide power to the sand and water circulation system and the circulation system automation components; Computer monitoring platform 20: connected to the electrical control cabinet 19, used to collect parameters in the circulation system automation components, control the operating parameters of the sand-water circulation system, and display the sediment concentration value in real time; The sand-water circulation system comprises a water pool 1, to which an outlet pipe 2 and an inlet pipe 3 are connected, and a variable frequency water pump 5 is commonly connected to the inlet pipe 3 and the outlet pipe 2. An electromagnetic flowmeter 7, a sensor installation section 6, an observation section 4 and a telescopic joint 11 are sequentially arranged on the outlet pipe 2, and the telescopic joint 11 is close to one side of the variable frequency water pump 5. An agitator mounting bracket 13 is arranged on the top of the water pool 1, and an agitator 12 is connected to the agitator mounting bracket 13, and the agitator 12 extends into the water pool, and a sampling port 24 is arranged on the outlet pipe 2.

[0026] The pool 1 is also provided with a drain valve 8 and a water supply valve 9. The circulation system automation components include a pressure sensor 14 , a pressure gauge 15 and a liquid level gauge 16 . The liquid level gauge 16 is arranged in the water pool 1 , and the pressure sensor 14 and the pressure gauge 15 are arranged on the water outlet pipe 2 .

[0027] The variable frequency water pump 5 adopts a vertical structure, and a stop valve 10 is installed before and after the variable frequency water pump 5. The stop valve 10 is also installed at the water inlet pipe 3 and the water outlet pipe 2 of the pool.

[0028] A first sand guide plate 18 and a second sand guide plate 17 are installed at the bottom of the pool. The outlet pipe 2 entering the pool 1 is provided with an elbow to introduce water flow into the pool. The elbow angle is 30-60°.

[0029] The stirrer bracket 13 is welded to the side wall of the pool 1, and the stirrer 12 is evenly installed on the bracket 13. The height of the stirrer 12 blade is adjustable.

[0030] The electrical control cabinet 19 is equipped with a touch screen and built-in control software. The operating power of the variable frequency water pump 5 is changed by setting the motor frequency of the variable frequency water pump 5, the circulating water flow test flow is adjusted, and the speed of the agitator 12 is adjusted by setting the motor frequency of the agitator 12.

[0031] The sampling port 24 is used for manual sampling and analysis of the concentration and gradation of the water-sediment flow, and is connected to the sampling system of other online sediment monitoring systems to test the accuracy of the online sediment monitoring system products under different working conditions.

[0032] Functions and workflow of the online monitoring test platform for sediment characteristics passing through turbines: Install the sediment sensor 21 on the sensor installation section 6, add test sand into the water pool, connect the electrical control cabinet 19 and the computer monitoring platform 20, set the water pump start frequency to the frequency of the first working condition through the electrical control cabinet 19 or the computer monitoring platform 20, then the water system starts to circulate, the sediment sensor 21 senses the water flow in the outlet pipe 2 to obtain the sediment concentration data, turn on the stirrer 12, stir the sediment in the water pool 1, monitor the sediment sensor 21 data, and when the data is stable, take out the first group of water samples from the sampling port with a sampling cup, read the flow rate and sediment sensor 21 data at this time According to the data, complete the first working condition test, adjust the starting frequency of the variable frequency water pump 5 to the second working condition frequency, and conduct the second working condition test in the same way. After completing all the tests, use the drying method or specific gravity method to measure the total weight / volume, dry the sediment and weigh the dry sand of each group of water samples, calculate the average sediment concentration of each group, compare the sampling concentration with the average concentration collected by the sensor, and obtain the sensor error under working condition 1. Use the same method to obtain the sensor error under other flow rate conditions, change the sediment concentration of pool 1, repeat the above test, and obtain the sensor error under the new concentration.

[0033] The step of connecting the sampling port 24 to the sampling interface of the sediment online monitoring system product and calibrating the sediment online monitoring system product specifically includes: Connect the electrical control cabinet 19 and the computer monitoring platform 20, set the starting frequency of the variable frequency water pump 5 to the predetermined working frequency, start the water system circulation, turn on the agitator 12, stir the sediment in the pool 1, monitor the sediment online monitoring system product data, and when the data is stable, take out the water sample from the sampling port 24, read the flow rate and sediment online monitoring system product data at this time, adjust the starting frequency of the variable frequency water pump 5 to the next working frequency, repeat the above steps to perform the next working test, and after completing all the tests, perform the total weight weighing / volume measurement, sediment precipitation drying, and dry sand weighing on each group of water samples by drying method or specific gravity method, calculate the average sediment concentration of each group, compare the sampled concentration with the average concentration collected by the sensor, and obtain the concentration error of the sediment online monitoring system product under each working condition. At the same time, perform the sediment gradation test on each group of water samples on the standard laser particle size analyzer to obtain the gradation error of the sediment online monitoring system product under each working condition.

[0034] Example 1: The preferred solution is Figures 1 to 4 As shown in the figure, an online monitoring test platform for sediment characteristics of a turbine is designed, including a sand-water circulation system, circulation system automation components, an electrical control cabinet, a computer monitoring platform, and a sediment monitoring sensor. Among them, the sand-water circulation system includes a water pool 1, an outlet pipe 2, an inlet pipe 3, an observation section 4, a telescopic joint 11, a variable frequency water pump 5, a sensor installation section 6, an electromagnetic flowmeter 7, a water supply valve 9, a vent valve 8, a sampling port 24, a stop valve 10, an agitator 12, and an agitator bracket 13. The design size of the water pool 1 is 2250 mm long, 2000 mm wide, and 1500 mm high. The water pump adopts a wear-resistant vertical sewage pump with a water pump power of 11 kW. The inlet pipe adopts a DN200 stainless steel pipe, the outlet pipe adopts a DN150 stainless steel pipe, the observation section 4 adopts a transparent organic glass material, and the sensor installation section 6 is designed with 2 sensor installation flange joints. Five agitators 12 are designed and installed in groups on two brackets. The entire sand and water circulation system is approximately 7500mm long and 2500mm wide.

[0035] The circulation system automation components include pressure sensor 14, mechanical pressure gauge 15, liquid level gauge 16 and the like.

[0036] The electrical control cabinet 19 includes a PLC controller, a frequency converter, a data acquisition module, etc.

[0037] The computer monitoring platform 20 communicates with the PLC in the electrical control cabinet 19 through a network cable. The computer is equipped with measurement and control software, which can control the frequency of the water pump motor, control the flow of the circulation system, and collect and store the online data collected by the sediment sensor 6. The real-time sediment concentration value can be displayed on the computer display.

[0038] The electrical control cabinet is connected to 380V, 220V power interfaces and 24V power supply, which can provide power to the water pump 5, the agitator 12, and various sensors.

[0039] The sediment sensor 21 is installed on the sensor mounting tube 6. The sensor is generally cylindrical and fixed to the mounting tube sleeve through a flange. The sensing end face of the sensor is flush with the inner wall of the pipeline. It is used to measure parameters such as sediment concentration of pressurized pipe water flow. The sensor is connected to the electrical control cabinet through a cable to realize power supply and data transmission.

[0040] The variable frequency water pump 5 adopts a vertical structure, the inlet end of the water pump is connected to the water inlet pipe, the outlet end is connected to the water outlet pipe, and the water pump is installed on the concrete foundation through anchor bolts.

[0041] The outlet pipe 2 realizes the change of pipe diameter and elevation through elbows, reducers, etc., and is equipped with a pressure sensor 14 and a pressure gauge 15. The outlet pipe is also equipped with an observation section 4, a sensor installation section 6, an electromagnetic flowmeter 7, etc. Stop valves 10-3 and 10-2 are installed before and after the variable frequency water pump, and stop valves 10-1 and 10-4 are installed at the water inlet pipe and the water outlet pipe of the pool.

[0042] A small sand guide plate 18 and a large sand guide plate 17 are installed at the bottom of the pool to reduce the area after sediment sedimentation so that the agitator can achieve the best effect. The outlet pipe 2 entering the pool is provided with an elbow to introduce water flow into the pool, and the elbow angle is about 30-60°. The agitator bracket 13 is welded to the side wall of the pool 1, and the agitator 12 is evenly installed on the bracket 13. The agitator blade has an adjustable elevation and maintains a safe distance from the inclined plate at the bottom of the pool.

[0043] A touch screen is installed on the electrical control cabinet 19, and a control software is built in. The operating power of the water pump can be changed by setting the water pump motor frequency, and the circulating water flow test flow rate can be adjusted. The agitator speed can be adjusted by setting the agitator motor frequency.

[0044] Two sampling ports 24 are provided on the water-sediment circulation system. The sampling ports 24 can realize manual sampling and analysis of the concentration and gradation of the water-sediment flow. The sampling and analysis data can verify the accuracy of the concentration sensor in the sensor installation section. At the same time, the sampling ports can be connected to the sampling systems of other online sediment monitoring systems to verify the accuracy of the online sediment monitoring system products under different working conditions.

[0045] Functions and workflow of the online monitoring test platform for sediment characteristics passing through turbines: Function 1: Sediment concentration sensor calibration Workflow: 1. Install the sediment sensors 21 on the sensor installation sections 6 respectively; 2. Add test sand of a certain grade into the pool; 3. Connect the electrical control cabinet 19 and the computer monitoring platform 20, and set the water pump start frequency to the frequency of the first working condition through the electrical control cabinet or the computer monitoring platform. At this time, the water system starts to circulate, and the sensor can sense the water flow in the outlet pipe to obtain sediment concentration data; 4. Turn on the agitator system to mix the mud and sand in the pool; 5. Monitor the sediment concentration sensor data. When the data is basically stable, use a sampling cup to take out the first group of water samples from the sampling port 24. Each group of water samples can be 3-5 cups; 6. Read the flow rate Q1 and sediment concentration sensor data 3-5 groups at this time to complete the first working condition test; 7. Adjust the water pump starting frequency to the second operating condition frequency, and conduct the second operating condition test in a similar manner; 8. After completing all the tests, use the drying method or specific gravity method to measure the total weight / volume of each group of water samples, dry the sediment, and weigh the dry sand. Calculate the average sediment concentration of each group, compare the sample concentration with the average concentration collected by the sensor, and obtain the sensor error under working condition 1.

[0046] 9. Use the same method to obtain the sensor error under other flow rate conditions.

[0047] 10. Change the sediment concentration in the pool, repeat the above test, and obtain the sensor error at the new concentration.

[0048] 11. If two sensors are installed, they can be calibrated simultaneously and the accuracy of the two sensors can be compared.

[0049] Function 2: Product calibration of sediment online monitoring system Workflow: 1. Connect sampling port 1 to the sampling interface of the sediment online monitoring system product; 2. Add test sand of a certain grade into the pool; 3. Connect the electrical control cabinet and computer monitoring platform, and set the water pump start frequency to the frequency of the first working condition through the electrical control cabinet or computer monitoring platform. At this time, the water system starts to circulate, and the sediment online monitoring system product can sense the water flow in the outlet pipe to obtain sediment concentration or gradation data; 4. Turn on the agitator system to mix the mud and sand in the pool; 5. Monitor the product data of the sediment online monitoring system. When the data is basically stable, use a sampling cup to take out the first group of water samples from the sampling port. Each group of water samples can be 3-5 cups; 6. Read the flow rate Q1 and 3-5 groups of sediment online monitoring system product data at this time to complete the first working condition test; 7. Adjust the water pump starting frequency to the second operating condition frequency, and conduct the second operating condition test in a similar manner; 8. After completing all the tests, use the drying method or specific gravity method to measure the total weight / volume of each group of water samples, dry the sediment and weigh the dry sand, and calculate the average sediment concentration of each group. Compare the sampling concentration with the average concentration of the sediment online monitoring system product to obtain the error of the sediment online monitoring system product under working condition 1.

[0050] 9. If the sediment online monitoring system product has the sediment grading function, take a group of dried sand samples and use a standard laser particle size analyzer to perform sediment grading test. Compare the test results with those of the sediment online monitoring system product to obtain its grading analysis error.

[0051] 10. Change the pump frequency according to the above method and conduct tests under the remaining flow rate conditions.

[0052] 11. Change the sediment concentration in the pool, repeat the above test, and obtain the error of the sediment online monitoring system product at the new concentration.

[0053] Although the embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments and application fields, and the above-mentioned specific embodiments are only illustrative and instructive, rather than restrictive. Under the guidance of the specification, a person skilled in the art can also make many forms without departing from the scope of protection of the claims of the present invention, all of which belong to the scope of protection of the present invention.

Claims

1. An online monitoring test platform for sediment characteristics of a hydraulic turbine, characterized in that: include: Sand and water circulation system: used to provide circulating water with different flow rates and sand contents; Circulation system automation components: used to monitor the operating parameters of the sand and water circulation system; Electrical control cabinet (19): used to provide power to the sand and water circulation system and the circulation system automation components; Computer monitoring platform (20): electrically connected to the electrical control cabinet (19), used to collect parameters in the circulation system automation components, control the operating parameters of the sand and water circulation system, and display the sediment concentration value in real time; The sand-water circulation system comprises a water pool (1), the water pool (1) is connected to a water outlet pipe (2) and a water inlet pipe (3), the water inlet pipe (3) and the water outlet pipe (2) are commonly connected to a variable frequency water pump (5), the water outlet pipe (2) is sequentially provided with an electromagnetic flowmeter (7), a sensor installation section (6), an observation section (4) and a telescopic joint (11), the telescopic joint (11) is close to a side of the variable frequency water pump (5), the top of the water pool (1) is provided with an agitator installation bracket (13), the agitator installation bracket (13) is connected to an agitator (12), the agitator (12) extends into the water pool, the water outlet pipe (2) is provided with a sampling port (24), and the sensor installation section (6) is provided with a sediment content monitoring sensor (21).

2. The on-line monitoring test platform for sediment characteristics of a hydraulic turbine according to claim 1 is characterized in that: The water pool (1) is also provided with a drain valve (8) and a water replenishment valve (9).

3. The on-line monitoring test platform for sediment characteristics of a hydraulic turbine according to claim 1 is characterized in that: The circulation system automation element comprises a pressure sensor (14), a pressure gauge (15) and a liquid level gauge (16); the liquid level gauge (16) is arranged in the water pool (1); the pressure sensor (14) and the pressure gauge (15) are arranged on the water outlet pipe (2); the sediment content monitoring sensor (21) is an optical sensing sensor; the sensor is provided with a sealing structure and is connected by a flange; after installation, its sensing end is located on the inner wall of the sensor installation section (6).

4. The on-line monitoring test platform for sediment characteristics of a hydraulic turbine according to claim 1 is characterized in that: The variable frequency water pump (5) adopts a vertical structure, and stop valves (10) are installed in front of and behind the variable frequency water pump (5). Stop valves (10) are also installed at the water inlet pipe (3) and the water outlet pipe (2) of the pool.

5. The on-line monitoring test platform for sediment characteristics of a hydraulic turbine according to claim 1 is characterized in that: A first sand guide plate (18) and a second sand guide plate (17) are installed at the bottom of the pool, and a water outlet pipe (2) entering the pool (1) is provided with an elbow to guide water flow into the pool, and the angle of the elbow is 30-60 degrees.

6. The on-line monitoring test platform for sediment characteristics of a hydraulic turbine according to claim 1 is characterized in that: The stirrer bracket (13) is welded to the side wall of the water pool (1), the stirrer (12) is evenly mounted on the bracket (13), and the paddle height of the stirrer (12) is adjustable.

7. The on-line monitoring test platform for sediment characteristics of a hydraulic turbine according to claim 1 is characterized in that: The electrical control cabinet (19) is provided with a touch screen and built-in control software. The operating power of the variable frequency water pump (5) is changed by setting the motor frequency of the variable frequency water pump (5) to adjust the circulating water flow test flow rate. The rotation speed of the agitator (12) is adjusted by setting the motor frequency of the agitator (12).

8. The on-line monitoring test platform for sediment characteristics of a hydraulic turbine according to claim 1 is characterized in that: The sampling port (24) is used for manually sampling and analyzing the concentration and gradation of the water-sediment flow, and is connected to the sampling system of other sediment online monitoring systems to test the accuracy of sediment online monitoring system products under different working conditions.

9. An online monitoring test method for sediment characteristics of a hydraulic turbine, based on an online monitoring test platform for sediment characteristics of a hydraulic turbine as claimed in any one of claims 1 to 8, characterized in that: include: The sediment sensor (21) is installed on the sensor installation section (6), and test sand is added to the water pool. The electrical control cabinet (19) and the computer monitoring platform (20) are connected, and the water pump start frequency is set to the frequency of the first working condition through the electrical control cabinet (19) or the computer monitoring platform (20). At this time, the water system starts to circulate, and the sediment sensor (21) senses the water flow in the outlet pipe (2) to obtain sediment concentration data. The stirrer (12) is turned on to stir the sediment in the water pool (1) and monitor the sediment sensor (21) data. When the data is stable, the first group of water samples are taken from the sampling port using a sampling cup, and the flow rate and The sediment sensor (21) data is used to complete the first working condition test. The starting frequency of the variable frequency water pump (5) is adjusted to the second working condition frequency. The second working condition test is carried out in the same manner. After all the tests are completed, the water samples of each group are subjected to the drying method or specific gravity method to measure the total weight / volume, dry the sediment and weigh the dry sand. The average sediment concentration of each group is calculated. The sample concentration is compared with the average concentration collected by the sensor to obtain the sensor error under working condition 1. The sensor error under other flow rate conditions is obtained in the same manner. The sediment concentration of the water pool (1) is changed and the above test is repeated to obtain the sensor error under the new concentration.

10. The on-line monitoring test platform for sediment characteristics of a hydraulic turbine according to claim 9, characterized in that: The method also includes connecting the sampling port (24) to the sampling interface of the sediment online monitoring system product and calibrating the sediment online monitoring system product, which specifically includes: The electrical control cabinet (19) and the computer monitoring platform (20) are connected, the starting frequency of the variable frequency water pump (5) is set to a predetermined working condition frequency, the water system circulation is started, the agitator (12) is turned on, the sediment in the pool (1) is stirred evenly, the sediment online monitoring system product data is monitored, and when the data is stable, a water sample is taken from the sampling port (24), the flow rate and sediment online monitoring system product data at this time are read, the starting frequency of the variable frequency water pump (5) is adjusted to the next working condition frequency, and the above steps are repeated to perform the next working condition test. After all the tests are completed, the total weight / volume measurement, sediment drying, and dry sand weighing are performed on each group of water samples by drying method or specific gravity method, and the average sediment concentration of each group is calculated. The sample concentration is compared with the average concentration collected by the sensor to obtain the concentration error of the sediment online monitoring system product under each working condition, and at the same time, the sediment gradation test of each group of water samples is performed on a standard laser particle size analyzer to obtain the gradation error of the sediment online monitoring system product under each working condition.

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