A high-temperature and high-pressure feed water pump hydraulic test system and test method

Abstract

A hydraulic testing system and method for a high-temperature, high-pressure feedwater pump includes a main circulation loop system, a steam heating system, a makeup water system, and a cooling water system. The main circulation loop system includes an integrated water tank. The outlet of the integrated water tank is sequentially connected to an inlet shut-off valve, an inlet regulating valve, and the inlet of the high-temperature, high-pressure feedwater pump. The outlet of the high-temperature, high-pressure feedwater pump is sequentially connected to an outlet regulating valve, a flow meter, a first shut-off valve, and a heat exchanger before returning to the inlet of the integrated water tank. The steam heating system is connected to the inside of the integrated water tank for heating the medium. The makeup water system is connected to the integrated water tank for automatically replenishing the medium loss. The cooling water system is connected to the heat exchanger for cooling the circulating medium. The system features a compact structure, high degree of automation, precise parameter adjustment, and safe and stable operation.

Description

Technical Field

[0001] This invention relates to the field of water pump equipment testing system technology, and in particular to a high-temperature and high-pressure water pump hydraulic testing system and testing method. Background Technology

[0002] Boiler feedwater pumps and nuclear power plant feedwater pumps typically have high feedwater head and temperature (e.g., feedwater temperature exceeding 100℃ and head exceeding 1000m). As key equipment for boiler feedwater, feedwater pumps generally require factory hydraulic performance testing. Due to the special characteristics of feedwater pumps—high head and high water temperature—the hydraulic performance testing system for feedwater pumps is more complex than that for general pumps, with higher technical parameter requirements, larger investment costs, more operating personnel required, and higher operational safety risks. Therefore, it is essential to design a dedicated high-temperature and high-pressure feedwater pump hydraulic testing system that is compact, has precise system parameter adjustment, a high degree of automation, and strong safety features. Summary of the Invention

[0003] To address the shortcomings of existing production technologies, the applicant provides a high-temperature, high-pressure water pump hydraulic testing system and method, which features a compact structure, high degree of automation, precise parameter adjustment, and safe and stable operation.

[0004] The technical solution adopted in this invention is as follows: A high-temperature and high-pressure feedwater pump hydraulic testing system includes a main circulation loop system, a steam heating system, a water replenishment system, and a cooling water system. The main circulation loop system includes an integrated water tank, an inlet shut-off valve, an inlet regulating valve, an inlet temperature sensor, an inlet pressure sensor, a high-temperature and high-pressure feedwater pump, an outlet pressure sensor, an outlet temperature sensor, an outlet regulating valve, a flow meter, a first shut-off valve, and a heat exchanger. The outlet of the integrated water tank is sequentially connected to the inlet shut-off valve, the inlet regulating valve, and the inlet of the high-temperature and high-pressure feedwater pump. The outlet of the high-temperature and high-pressure feedwater pump is sequentially connected to the outlet regulating valve, the flow meter, the first shut-off valve, and the heat exchanger before returning to the inlet of the integrated water tank. The steam heating system is connected to the inside of the integrated water tank and is used to heat the medium; The water replenishment system is connected to an integrated water tank for automatically replenishing media losses; The cooling water system is connected to the heat exchanger and is used to cool the circulating medium.

[0005] Its further technical solution lies in: The steam heating system includes a second shut-off valve, a steam inlet regulating valve, a first safety valve, and a first control cabinet. The steam source is connected to the heating coil inside the integrated water tank via the second shut-off valve and the steam inlet regulating valve. The first control cabinet is signal-connected to the steam inlet regulating valve and controls the opening degree of the steam inlet regulating valve according to the temperature deviation.

[0006] The water replenishment system includes a demineralized water tank, a water replenishment pump, a regulating valve, a secondary control cabinet, and a filter. The demineralized water tank is connected to an integrated water tank via the water replenishment pump, the regulating valve, and the filter. The secondary control cabinet is signal-connected to the regulating valve and controls the start and stop of the water replenishment pump and the opening degree of the regulating valve according to the liquid level deviation.

[0007] The cooling water system includes a temperature control valve and a third control cabinet; the cooling water source is connected to the cooling water inlet of the heat exchanger via the temperature control valve; the third control cabinet is connected to the cooling water source via the temperature control valve signal, and controls the opening degree of the temperature control valve according to the temperature deviation.

[0008] The integrated water tank includes a tank body, a level gauge, a temperature sensor, a pressure sensor, a water inlet sprayer, a porous baffle, an anti-vortex cross plate, a heating coil, and a water pump suction port. The water inlet sprayer is installed on the upper part of the tank body and connected to the heat exchanger outlet. The porous baffle is installed horizontally in the middle of the tank body. The anti-vortex cross plate is located above the water pump suction port. The heating coil is installed on the lower part of the tank body. The water pump suction port is located at the bottom of the tank body and connected to the water inlet shut-off valve.

[0009] The porous baffle is configured in three layers to break up rising bubbles, homogenize water temperature, and stabilize liquid flow.

[0010] The water inlet sprayer has a porous structure and is used to evenly disperse and spray the return water into the tank, eliminating the impact kinetic energy of the water flow and releasing undissolved gases in the water.

[0011] The inlet water temperature sensor and the outlet water temperature sensor are respectively connected to the No. 1 control cabinet of the steam heating system and the No. 3 control cabinet of the cooling water system to form a closed-loop temperature control system.

[0012] The integrated water tank is also equipped with a drain valve, a vent valve, a safety valve, and a manhole; the drain valve is installed at the bottom of the tank body, the vent valve and the safety valve are installed at the top of the tank body, and the manhole is located on the side of the tank body.

[0013] A hydraulic testing system and method for high-temperature and high-pressure feed water pumps. Includes the following steps: Step 1: Close the drain valve, open the vent valve, and inject demineralized water into the integrated water tank through the water replenishment system until the set liquid level is reached; Step 2: Start the steam heating system, adjust the opening of the steam inlet regulating valve according to the feedback of the inlet water temperature sensor, so that the heating coil preheats the medium in the tank to the starting temperature required for the test, and close the vent valve. Step 3: Open the inlet shut-off valve and the No. 1 shut-off valve, start the high temperature and high pressure water pump, and adjust the outlet regulating valve to make the medium circulate in the circuit. Step 4: Set target parameters according to test requirements, control the flow rate by adjusting the outlet water regulating valve, control the medium temperature by coordinating the steam heating system and cooling water system, and automatically maintain a stable liquid level by the water replenishment system; Step 5: After the operating conditions stabilize, collect data through each sensor and calculate the water pump performance parameters; Step 6: After completing the multi-condition test by repeating steps 4 and 5, stop the high-temperature and high-pressure water pump, close the inlet shut-off valve and the No. 1 shut-off valve, open the vent valve to release pressure, and open the drain valve to drain the medium.

[0014] The beneficial effects of this invention are as follows: (i) The invention features a highly integrated design and a compact structure: This invention integrates multiple functions such as steam heating, bubble elimination, release of insoluble gases, prevention of vortex, temperature monitoring, and pressure monitoring into a single water tank. This avoids the problems of large footprint, complex piping, and large energy loss caused by the dispersed arrangement of multiple independent devices in traditional testing systems. The overall structure is compact and has a high space utilization rate.

[0015] (ii) The present invention has stable flow and high testing accuracy: The integrated water tank is equipped with an inlet sprayer, three layers of porous baffles and an anti-vortex cross plate; the inlet sprayer evenly disperses the return water, effectively eliminating the impact kinetic energy of the water flow on the liquid surface and maintaining the stability of the liquid surface. The porous baffle further breaks up rising air bubbles, releases insoluble gases in the water, and homogenizes the water temperature. The anti-vortex cross plate prevents vortices from forming at the suction port, avoids gas from being carried into the pump, and ensures stable flow at the pump inlet, thereby significantly improving the repeatability and accuracy of hydraulic performance testing.

[0016] (III) The parameters of this invention are precisely adjustable, and the degree of automation in control is high: The system uses multiple sensors (temperature, pressure, liquid level, flow rate) to provide real-time feedback, and works with independent control cabinets for each subsystem to achieve fully closed-loop automatic control. The inlet water temperature is precisely regulated through the linkage of the steam heating system and the cooling water system. The liquid level is automatically maintained constant by the water replenishment system. The flow rate and pressure are precisely controlled by regulating valves. This can significantly reduce manual intervention, reduce the labor intensity of operators, and improve testing efficiency and system response speed.

[0017] (iv) This invention is safe, reliable, and highly adaptable in operation: The system features multiple safety protection designs. The integrated water tank is equipped with a safety valve, pressure sensor, and vent valve to monitor the pressure inside the tank in real time and automatically release pressure in case of overpressure. The water replenishment system is equipped with a filter to ensure the quality of the replenished water and prevent impurities from entering the circulation system and damaging the pump unit. All valves and control systems work together to adapt to the testing requirements of high-temperature and high-pressure feedwater pumps of different models and under different operating conditions, including harsh conditions such as boiler feedwater pumps and nuclear power plant feedwater pumps.

[0018] (v) This invention is energy-saving and environmentally friendly, with high media utilization: The closed-loop design allows for the recycling of the test medium (demineralized water), reducing water waste. The steam heating system and cooling water system work together to achieve high thermal efficiency and avoid excessive energy loss. The water replenishment system only replenishes losses from evaporation and leakage, resulting in high medium utilization and low operating costs.

[0019] In summary, this invention has significant advantages in terms of structural design, control precision, operational stability, and safety. It can meet the stringent hydraulic performance testing requirements of high-temperature and high-pressure water pumps and has good prospects for industrial application and promotion value. Attached Figure Description

[0020] Figure 1 This is a system structure diagram of the present invention.

[0021] Figure 2 This is a schematic diagram of the main circulation loop system of the present invention.

[0022] Figure 3 This is a schematic diagram of the steam heating system of the present invention.

[0023] Figure 4 This is a schematic diagram of the water replenishment system of the present invention.

[0024] Figure 5 This is a schematic diagram of the cooling water system of the present invention.

[0025] Figure 6 This is a schematic diagram of the integrated water tank of the present invention.

[0026] The system includes: 1. Main circulation loop system; 2. Steam heating system; 3. Water supply system; 4. Cooling water system; 5. Integrated water tank; 6. Inlet shut-off valve; 7. Inlet regulating valve; 8. Inlet water temperature sensor; 9. Inlet water pressure sensor; 10. High-temperature and high-pressure feed water pump; 11. Outlet water pressure sensor; 12. Outlet water temperature sensor; 13. Outlet water regulating valve; 14. Flow meter; 15. No. 1 shut-off valve; 16. Heat exchanger; 17. No. 2 shut-off valve; 18. Steam inlet regulating valve; 19. No. 1 safety valve. 20. Full valve; 21. Control cabinet No. 1; 22. Demineralized water tank; 23. Make-up water pump; 24. Regulating valve; 25. Control cabinet No. 2; 26. Filter; 27. Temperature control valve; 28. Control cabinet No. 3; 29. ​​Tank body; 30. Level gauge; 31. Temperature sensor; 32. Pressure sensor; 33. Inlet sprayer; 34. Perforated baffle; 35. Anti-vortex cross plate; 36. Heating coil; 37. Water pump suction port; 38. Drain valve; 39. Vent valve; 40. Safety valve No. 2; 41. Manhole. Detailed Implementation

[0027] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0028] like Figures 1-6 As shown, the high-temperature and high-pressure water pump hydraulic testing system of this embodiment includes a main circulation loop system 1, a steam heating system 2, a water replenishment system 3, and a cooling water system 4. The main circulation loop system 1 includes an integrated water tank 5, an inlet shut-off valve 6, an inlet regulating valve 7, an inlet temperature sensor 8, an inlet pressure sensor 9, a high-temperature and high-pressure water pump 10, an outlet pressure sensor 11, an outlet temperature sensor 12, an outlet regulating valve 13, a flow meter 14, a first shut-off valve 15, and a heat exchanger 16. The outlet of the integrated water tank 5 is sequentially connected to the inlet shut-off valve 6, the inlet regulating valve 7, and the inlet of the high-temperature and high-pressure water pump 10. The outlet of the high-temperature and high-pressure water pump 10 is sequentially connected to the outlet regulating valve 13, the flow meter 14, the first shut-off valve 15, and the heat exchanger 16 before returning to the inlet of the integrated water tank 5. The steam heating system 2 is connected to the interior of the integrated water tank 5 and is used to heat the medium; The water replenishment system 3 is connected to the integrated water tank 5 for automatically replenishing the lost medium. Cooling water system 4 is connected to heat exchanger 16 for cooling the circulating medium.

[0029] The steam heating system 2 includes a second shut-off valve 17, a steam inlet regulating valve 18, a first safety valve 19, and a first control cabinet 20. The steam source is connected to the heating coil 35 inside the integrated water tank 5 via the second shut-off valve 17 and the steam inlet regulating valve 18. The first control cabinet 20 is signal-connected to the steam inlet regulating valve 18 and controls the opening degree of the steam inlet regulating valve 18 according to the temperature deviation.

[0030] The water replenishment system 3 includes a demineralized water tank 21, a water replenishment pump 22, a regulating valve 23, a second control cabinet 24, and a filter 25. The demineralized water tank 21 is connected to the integrated water tank 5 via the water replenishment pump 22, the regulating valve 23, and the filter 25. The second control cabinet 24 is connected to the regulating valve 23 by signal, and controls the start and stop of the water replenishment pump 22 and the opening degree of the regulating valve 23 according to the liquid level deviation.

[0031] The cooling water system 4 includes a temperature control valve 26 and a third control cabinet 27; the cooling water source is connected to the cooling water inlet of the heat exchanger 16 via the temperature control valve 26; the third control cabinet 27 is connected to the cooling water source via the temperature control valve 26 and controls the opening of the temperature control valve 26 according to the temperature deviation.

[0032] The integrated water tank 5 includes a tank body 28, a level gauge 29, a temperature sensor 30, a pressure sensor 31, a water inlet sprayer 32, a porous baffle 33, an anti-vortex cross plate 34, a heating coil 35, and a water pump suction port 36. The water inlet sprayer 32 is installed on the upper part of the tank body 28 and connected to the outlet of the heat exchanger 16. The porous baffle 33 is horizontally installed in the middle of the tank body 28. The anti-vortex cross plate 34 is located above the water pump suction port 36. The heating coil 35 is installed on the lower part of the tank body 28. The water pump suction port 36 is located at the bottom of the tank body 28 and connected to the water inlet shut-off valve 6.

[0033] The porous baffle 33 is configured in three layers to break up rising bubbles, homogenize water temperature, and stabilize liquid flow.

[0034] The water inlet sprayer 32 has a porous structure, which is used to evenly disperse and spray the return water into the tank, eliminate the impact kinetic energy of the water flow, and release undissolved gases in the water.

[0035] The inlet water temperature sensor 8 and the outlet water temperature sensor 12 are respectively connected to the No. 1 control cabinet 20 of the steam heating system 2 and the No. 3 control cabinet 27 of the cooling water system 4 to form a closed-loop temperature control system.

[0036] The integrated water tank 5 is also equipped with a drain valve 37, a vent valve 38, a safety valve 39, and a manhole 40; the drain valve 37 is installed at the bottom of the tank body 28, the vent valve 38 and the safety valve 39 are installed at the top of the tank body 28, and the manhole 40 is located on the side of the tank body 28.

[0037] The high-temperature and high-pressure water pump hydraulic testing system and testing method described in this embodiment Includes the following steps: Step 1: Close the drain valve 37, open the vent valve 38, and inject demineralized water into the integrated water tank 5 through the water replenishment system 3 until the set liquid level is reached; Step 2: Start the steam heating system 2, adjust the opening of the steam inlet regulating valve 18 according to the feedback of the inlet water temperature sensor 8, so that the heating coil 35 preheats the medium in the tank to the initial temperature required for the test, and close the vent valve 38. Step 3: Open the inlet shut-off valve 6 and the first shut-off valve 15, start the high temperature and high pressure water pump 10, and adjust the outlet regulating valve 13 to make the medium circulate in the circuit. Step 4: Set the target parameters according to the test requirements, control the flow rate by adjusting the outlet water regulating valve 13, control the medium temperature by coordinating the steam heating system 2 and the cooling water system 4, and automatically maintain the liquid level stability by the water replenishment system 3. Step 5: After the operating conditions stabilize, collect data through each sensor and calculate the water pump performance parameters; Step 6: After completing the multi-condition test by repeating steps 4 and 5, stop the high-temperature and high-pressure water pump 10, close the inlet shut-off valve 6 and the first shut-off valve 15, open the vent valve 38 to release pressure, and open the drain valve 37 to drain the medium.

[0038] like Figures 1-6 As shown, the specific structure and function of the high-temperature and high-pressure water pump hydraulic testing system of the present invention are as follows: It includes the main circulation loop system 1, the steam heating system 2, the water replenishment system 3, and the cooling water system 4.

[0039] Among them, the main circulation loop system 1 constitutes a closed-loop test loop, using demineralized water as the test medium.

[0040] Among them, the steam heating system 2 is used to preheat the medium and maintain the temperature during the test process.

[0041] The cooling water system 4 is used to cool the medium and works in conjunction with the steam heating system 2 to maintain a constant medium temperature.

[0042] The water replenishment system 3 is used to automatically replenish the medium loss caused by evaporation, leakage, etc. during the test process, and to keep the liquid level in the integrated water tank 5 stable.

[0043] like Figure 2As shown, the main circulation loop system 1 includes an integrated water tank 5, a water pump inlet shut-off valve 6, an inlet regulating valve 7, an inlet water temperature sensor 8, an inlet water pressure sensor 9, a high-temperature and high-pressure water pump 10, an outlet water pressure sensor 11, an outlet water temperature sensor 12, an outlet water regulating valve 13, a flow meter 14, a first shut-off valve 15, and a heat exchanger 16. The components are connected sequentially via pipes. Specifically, the water pump suction port 36 of the integrated water tank 5 is connected to the inlet of the high-temperature and high-pressure water pump 10 via a pipe, on which the water pump inlet shut-off valve 6 and the inlet regulating valve 7 are sequentially installed. The inlet water temperature sensor 8 and the inlet water pressure sensor 9 are installed on the inlet pipe of the high-temperature and high-pressure water pump 10. The outlet of the high-temperature and high-pressure water pump 10 is connected to the inlet of the heat exchanger 16 via a pipe, on which the outlet water regulating valve 13, the flow meter 14, and the first shut-off valve 15 are sequentially installed. The outlet water pressure sensor 11 and the outlet water temperature sensor 12 are installed on the outlet pipe of the high-temperature and high-pressure water pump 10. The outlet of heat exchanger 16 is connected to the inlet of water sprayer 32 of integrated water tank 5 through a pipe, forming a complete circulation loop.

[0044] like Figure 3 As shown, the steam heating system 2 includes a second shut-off valve 17, a steam inlet regulating valve 18, a first safety valve 19, and a first control cabinet 20. The steam source is connected via pipelines through the second shut-off valve 17 and the steam inlet regulating valve 18 to the inlet of the heating coil 35 inside the integrated water tank 5. The outlet of the heating coil 35 is connected to a drain device. The first safety valve 19 is installed on the steam pipeline for overpressure protection. The first control cabinet 20 is connected to the inlet water temperature sensor 8 and controls the opening of the steam inlet regulating valve 18 based on the deviation between the set temperature and the measured temperature.

[0045] like Figure 4 As shown, the water replenishment system 3 includes a demineralized water tank 21, a water replenishment pump 22, a regulating valve 23, a secondary control cabinet 24, and a filter 25. The outlet of the demineralized water tank 21 is connected to the inlet of the water replenishment pump 22 via a pipe. The outlet of the water replenishment pump 22 is connected to the water replenishment port of the integrated water tank 5 (which can be located on the upper part of the tank) via the regulating valve 23 and the filter 25. The secondary control cabinet 24 is connected to the level gauge 29 and controls the start and stop of the water replenishment pump 22 and the opening degree of the regulating valve 23 according to the deviation between the set level and the measured level.

[0046] like Figure 5 As shown, the cooling water system 4 includes a temperature control valve 26 and a third control cabinet 27. The cooling water source is connected to the cooling water inlet of the heat exchanger 16 via a pipe through the temperature control valve 26, and the cooling water outlet of the heat exchanger 16 is connected to the return water system. The third control cabinet 27 is connected to the inlet water temperature sensor 8 and controls the opening of the temperature control valve 26 according to the deviation between the set temperature and the measured temperature to adjust the cooling water flow rate.

[0047] like Figure 6As shown, the integrated water tank 5 includes a tank body 28, a level gauge 29, a temperature sensor 30, a pressure sensor 31, an inlet sprayer 32, a porous baffle 33, an anti-vortex cross plate 34, a heating coil 35, a water pump suction port 36, a drain valve 37, a vent valve 38, a second safety valve 39, and a manhole 40. The inlet sprayer 32 is installed on the upper part of the tank body 28, with its inlet connected to the outlet of the heat exchanger 16. It is used to evenly spray return water into the tank, eliminating the impact kinetic energy of the water flow and releasing undissolved gases in the water. The porous baffle 33 is configured in three layers, horizontally installed in the middle of the tank, used to break up rising air bubbles, homogenize water temperature, and stabilize the liquid flow. The anti-vortex cross plate 34 is located above the water pump suction port 36, with a cross-shaped structure, to prevent vortices from being generated during pumping and bringing gas into the pump. The heating coil 35 is installed at the lower part of the tank body 28 for heating the medium. Temperature sensor 30 is installed in the middle of the tank to measure the temperature of the medium inside the tank; pressure sensor 31 is installed at the top of the tank to monitor the pressure inside the tank; level gauge 29 is installed on the side of the tank, using a magnetic float level gauge, with local display and remote signal output functions. Water pump suction port 36 is located at the bottom of the tank and is connected to water pump inlet shut-off valve 6 via a pipe. Drain valve 37 is installed at the lowest point of the tank bottom to empty the medium inside the tank; vent valve 38 is installed at the top of the tank to release gas inside the tank or to manually release pressure in case of overpressure; safety valve 39 is installed at the top of the tank for automatic pressure release in case of overpressure; manhole 40 is located on the side of the tank for easy maintenance.

[0048] In actual work, the testing method includes the following steps: Step 1: System Preparation and Warm-up Close the drain valve 37 and open the vent valve 38. Inject demineralized water into the integrated water tank 5 through the water replenishment system 3 until the set liquid level is reached. Start the steam heating system 2 and open the second shut-off valve 17. Based on the feedback from the inlet water temperature sensor 8, the first control cabinet 20 adjusts the opening of the steam inlet regulating valve 18 to allow steam to enter the heating coil 35 to preheat the medium in the tank until the medium temperature reaches the initial temperature required for testing (e.g., 120°C). During the preheating process, non-condensable gases in the tank are discharged through the vent valve 38.

[0049] Step 2: Start the main loop: Close the vent valve 38, open the water pump inlet shut-off valve 6 and the first shut-off valve 15, and start the high-temperature and high-pressure feed water pump 10. Adjust the outlet regulating valve 13 to the appropriate opening degree through the control cabinet to allow the medium to begin circulating in the circuit. At this time, the medium flows out from the integrated water tank 5, is pressurized by the high-temperature and high-pressure feed water pump 10, and is cooled by the heat exchanger 16 (if cooling is required) before returning to the water tank.

[0050] Step 3: Parameter Adjustment and Stabilization Parameters such as target flow rate, inlet pressure, and medium temperature are set according to test requirements. The pump flow rate is changed by adjusting the opening of the outlet regulating valve 13, and the pump inlet pressure is fine-tuned by the inlet regulating valve 7 (or by adjusting the system back pressure). Simultaneously, the temperature control system operates automatically: the inlet water temperature sensor 8 monitors the temperature in real time, and control cabinets 1 and 3 adjust the steam regulating valve 18 and temperature control valve 26 respectively according to the deviation, achieving a dynamic balance between heating and cooling, and stabilizing the medium temperature within the set value ± allowable error range. The level gauge 29 monitors the liquid level in real time, and control cabinet 24 controls the water replenishment pump 22 and regulating valve 23 to automatically replenish water according to the deviation, maintaining a constant liquid level.

[0051] Step 4: Data Acquisition and Performance Calculation After the operating conditions stabilize, data is collected in real time by instruments such as inlet water temperature sensor 8, inlet water pressure sensor 9, outlet water pressure sensor 11, outlet water temperature sensor 12, and flow meter 14. The performance parameters of the water pump, such as head, efficiency, and shaft power, are calculated and the test results are recorded.

[0052] Step 5: Multi-condition testing: As needed, change the opening of the outlet regulating valve 13 to adjust to the next flow point, and repeat steps three and four until all test conditions are completed.

[0053] Step Six: System Shutdown and Draining: After the test is completed, gradually close the outlet regulating valve 13, stop the high-temperature and high-pressure water pump 10, and close the water pump inlet shut-off valve 6 and the first shut-off valve 15. Open the vent valve 38 to release pressure, and after the temperature and pressure inside the tank have dropped to a safe range, open the drain valve 37 to empty the medium inside the tank. Turn off the power to all control systems and perform equipment inspection and maintenance.

[0054] During testing, the steam heating system 2 and the cooling water system 4 work together to maintain a constant medium temperature. When the inlet water temperature sensor 8 detects that the temperature is lower than the set value, the first control cabinet 20 opens the steam inlet regulating valve 18 to increase the amount of heating steam; at the same time, the third control cabinet 27 closes the temperature control valve 26 to reduce the cooling water flow, and the two work together to raise the temperature. Conversely, when the temperature is higher than the set value, the amount of heating steam is reduced and the cooling water flow is increased to achieve rapid response and precise temperature control. The water replenishment system 3 is independent of the temperature control and always maintains a stable liquid level in the tank, ensuring sufficient net positive suction head at the pump inlet to prevent cavitation. The porous baffle 33 and anti-vortex cross plate 34 inside the integrated water tank 5 ensure that the medium flow into the water pump suction port 36 is uniform and stable, further improving the testing accuracy.

[0055] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A hydraulic testing system for a high-temperature, high-pressure water pump, characterized in that: The system includes a main circulation loop system (1), a steam heating system (2), a water replenishment system (3), and a cooling water system (4). The main circulation loop system (1) includes an integrated water tank (5), an inlet shut-off valve (6), an inlet regulating valve (7), an inlet temperature sensor (8), an inlet pressure sensor (9), a high-temperature and high-pressure water pump (10), an outlet pressure sensor (11), an outlet temperature sensor (12), an outlet regulating valve (13), a flow meter (14), a first shut-off valve (15), and a heat exchanger (16). The outlet of the integrated water tank (5) is connected in sequence to the inlet shut-off valve (6), the inlet regulating valve (7), and the inlet of the high-temperature and high-pressure water pump (10). The outlet of the high-temperature and high-pressure water pump (10) is connected in sequence to the outlet regulating valve (13), the flow meter (14), the first shut-off valve (15), and the heat exchanger (16) before returning to the inlet of the integrated water tank (5). The steam heating system (2) is connected to the interior of the integrated water tank (5) for heating the medium; The water replenishment system (3) is connected to the integrated water tank (5) for automatically replenishing the lost medium. The cooling water system (4) is connected to the heat exchanger (16) for cooling the circulating medium.

2. The high-temperature and high-pressure water pump hydraulic testing system as described in claim 1, characterized in that: The steam heating system (2) includes a second shut-off valve (17), a steam inlet regulating valve (18), a first safety valve (19), and a first control cabinet (20). The steam source is connected to the heating coil (35) inside the integrated water tank (5) via the second shut-off valve (17) and the steam inlet regulating valve (18). The first control cabinet (20) is connected to the steam inlet regulating valve (18) by signal and controls the opening degree of the steam inlet regulating valve (18) according to the temperature deviation.

3. The high-temperature and high-pressure water pump hydraulic testing system as described in claim 1, characterized in that: The water replenishment system (3) includes a demineralized water tank (21), a water replenishment pump (22), a regulating valve (23), a second control cabinet (24), and a filter (25). The demineralized water tank (21) is connected to the integrated water tank (5) via the water replenishment pump (22), the regulating valve (23), and the filter (25). The second control cabinet (24) is signal-connected to the regulating valve (23) and controls the start and stop of the water replenishment pump (22) and the opening degree of the regulating valve (23) according to the liquid level deviation.

4. The high-temperature and high-pressure water pump hydraulic testing system as described in claim 1, characterized in that: The cooling water system (4) includes a temperature control valve (26) and a third control cabinet (27); the cooling water source is connected to the cooling water inlet of the heat exchanger (16) via the temperature control valve (26); the third control cabinet (27) is connected to the cooling water source via the temperature control valve (26) and controls the opening of the temperature control valve (26) according to the temperature deviation.

5. The high-temperature and high-pressure water pump hydraulic testing system as described in claim 1, characterized in that: The integrated water tank (5) includes a tank body (28), a level gauge (29), a temperature sensor (30), a pressure sensor (31), a water inlet sprayer (32), a porous baffle (33), an anti-vortex cross plate (34), a heating coil (35), and a water pump suction port (36). The water inlet sprayer (32) is installed on the upper part of the tank body (28) and connected to the outlet of the heat exchanger (16). The porous baffle (33) is installed horizontally in the middle of the tank body (28). The anti-vortex cross plate (34) is located above the water pump suction port (36). The heating coil (35) is installed on the lower part of the tank body (28). The water pump suction port (36) is located at the bottom of the tank body (28) and connected to the water inlet shut-off valve (6).

6. The high-temperature and high-pressure water pump hydraulic testing system as described in claim 5, characterized in that: The porous baffle (33) is configured in three layers to break up rising bubbles, homogenize water temperature and stabilize liquid flow.

7. The high-temperature and high-pressure water pump hydraulic testing system as described in claim 5, characterized in that: The water inlet sprayer (32) has a porous structure and is used to evenly disperse and spray the return water into the tank, eliminate the impact kinetic energy of the water flow and release the undissolved gas in the water.

8. The high-temperature and high-pressure water pump hydraulic testing system as described in claim 1, characterized in that: The inlet water temperature sensor (8) and outlet water temperature sensor (12) are respectively connected to the No. 1 control cabinet (20) of the steam heating system (2) and the No. 3 control cabinet (27) of the cooling water system (4) to form a temperature closed-loop control system.

9. The high-temperature and high-pressure water pump hydraulic testing system as described in claim 1, characterized in that: The integrated water tank (5) is also equipped with a drain valve (37), a vent valve (38), a safety valve (39) and a manhole (40); the drain valve (37) is installed at the bottom of the tank body (28), the vent valve (38) and the safety valve (39) are installed at the top of the tank body (28), and the manhole (40) is located on the side of the tank body (28).

10. A hydraulic testing system and method for a high-temperature, high-pressure feedwater pump as described in any one of claims 1-9, characterized in that: Includes the following steps: Step 1: Close the drain valve (37), open the vent valve (38), and inject demineralized water into the integrated water tank (5) through the water replenishment system (3) to the set level; Step 2: Start the steam heating system (2), adjust the opening of the steam regulating valve (18) according to the feedback of the inlet water temperature sensor (8), so that the heating coil (35) preheats the medium in the tank to the starting temperature required for the test, and close the vent valve (38). Step 3: Open the inlet shut-off valve (6) and the first shut-off valve (15), start the high temperature and high pressure water pump (10), and adjust the outlet regulating valve (13) to make the medium circulate in the circuit; Step 4: Set target parameters according to test requirements, control the flow rate by adjusting the outlet water regulating valve (13), control the medium temperature by coordinating the steam heating system (2) and the cooling water system (4), and automatically maintain the liquid level stability by the water replenishment system (3); Step 5: After the operating conditions stabilize, collect data through each sensor and calculate the water pump performance parameters; Step 6: After completing the multi-condition test by repeating steps 4 and 5, stop the high-temperature and high-pressure water pump (10), close the inlet shut-off valve (6) and the No. 1 shut-off valve (15), open the vent valve (38) to release pressure, and open the drain valve (37) to drain the medium.

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