Phosphate fire-resistant oil operation working condition simulation system and working condition simulation method

Abstract

The invention relates to the technical field of phosphate fire-resistant oil production, in particular to a phosphate fire-resistant oil operation condition simulation system and a phosphate fire-resistant oil operation condition simulation method. The system comprises a working condition simulation module, a servo working module, a sensing monitoring module and an oil product detection module. The working condition simulation module comprises a first circulation loop, an oil tank, a constant-pressure variable displacement piston pump and a throttling valve. And the constant-pressure variable displacement piston pump and the throttle valve respectively simulate the working pressure and the flow speed of the steam turbine speed regulating system. The servo working module comprises a servo valve and a leather bag type energy accumulator, the sensing monitoring module comprises a first pressure sensor and a flow sensor, and the oil product detection module is in butt joint with an oil tank and is used for detecting and analyzing performance indexes of fire-resistant oil to be detected in the oil tank. The working pressure and the flowing speed of a steam turbine speed regulating system are simulated, the performance change process of the fire-resistant oil under the actual working condition is effectively reflected, and the reliability of the fire-resistant oil in use is evaluated by tracking the influence on the action of the servo valve after the fire-resistant oil to be tested is gradually aged.

Description

Technical Field

[0001] The present invention relates to the technical field of phosphate ester fire-resistant oil production, in particular to a phosphate ester fire-resistant oil operation condition simulation system and a condition simulation method. Background Art

[0002] Phosphate ester fire-resistant oil has excellent flame retardancy and is widely used as a flame-retardant hydraulic fluid in the electro-hydraulic control systems of generator sets, effectively reducing fires caused by hydraulic oil leaking onto hot surfaces. However, because phosphate ester fire-resistant oil is a synthetic ester oil, primarily composed of triaryl phosphates, it is susceptible to aging and deterioration during use due to a combination of factors, including heat, oxygen, water, chemical media, and mechanical forces. This can alter its chemical composition and molecular structure, and its physical and chemical properties, thus affecting its performance.

[0003] The main signs of deteriorating performance of phosphate ester fire-resistant oils are darkening of the oil, increasing acidity, decreasing resistivity, and increasing air release and foaming properties. In severe cases, this can lead to the formation of sludge and varnish. Increased acidity and decreased resistivity can lead to corrosion of fire-resistant oil system components, compromising system stability and safety. Increased air release and foaming properties can cause bubbles to be carried within the fire-resistant oil, leading to unstable system pressure and vibration in equipment and piping. Sludge and varnish formed by oil aging can clog filters in the fire-resistant oil system, leading to insufficient oil supply from the pump and a drop in oil pressure. Sludge precipitation can also result in substandard oil particle size, which can cause servo valves to stick and the system to malfunction. When fire-resistant oil performance indicators fail to meet standards, oil quality must be restored through replenishment, replacement of old oil, or regeneration to ensure proper system operation. However, all of these methods result in oil loss and increased operating and maintenance costs. Therefore, scientifically and effectively identifying phosphate ester fire-resistant oils with the best anti-aging properties can effectively improve the safety, stability, and economic efficiency of fire-resistant oil systems.

[0004] Currently, the main evaluation methods for the anti-aging properties of phosphate ester fire-resistant oils include DL / T 1705-2017 "Closed Cup Aging Test Method for Phosphate Ester Fire-Resistant Oils", DL / T 429.6-2015 "Open Cup Aging Test Method for Power Oils", and DL / T 1654-2016 "Test Method for Oxidative Stability and Corrosion of Phosphate Ester Fire-Resistant Oils". All three evaluation methods involve accelerated aging of phosphate ester fire-resistant oils in closed, open, and pure oxygen environments under certain temperature and catalyst conditions. The aging condition is determined by measuring the changes in acid value, sludge, or metal test piece mass before and after aging. The smaller the increase in acid value, the less sludge precipitation, or the smaller the change in metal test piece mass, the better the anti-aging properties of the phosphate ester fire-resistant oil.

[0005] However, the above three evaluation methods are all static tests, and the oil is in a steady-state condition during the test, which is far from the actual operating conditions of phosphate ester fire-resistant oil as a hydraulic working medium. They cannot effectively reflect the aging of the fire-resistant oil under actual working conditions and the impact of the oil aging process on the entire regulation system. Summary of the Invention

[0006] The technical problem to be solved by the embodiments of the present invention is to provide a phosphate ester fire-resistant oil operating condition simulation system and operating condition simulation method to solve the problem that the phosphate ester fire-resistant oil test in the prior art cannot effectively reflect the various performance indicators of the phosphate ester fire-resistant oil in actual working conditions.

[0007] The present invention discloses a phosphate ester fire-resistant oil operating condition simulation system, comprising: The operating condition simulation module includes a first circulation loop, and an oil tank, a constant-pressure variable piston pump, and a throttle valve connected in sequence through the first circulation loop, wherein the liquid inlet end of the first circulation loop is connected to the bottom of the oil tank, and the liquid return end of the first circulation loop is connected to the top of the oil tank. The drive input end of the constant-pressure variable piston pump is connected to a variable-frequency motor, so that the constant-pressure variable piston pump and the throttle valve respectively simulate the working pressure and flow rate of the steam turbine speed control system; A servo working module, comprising a servo valve and a bladder accumulator, wherein the servo valve is located between the constant-pressure variable-displacement plunger pump and the throttle valve and is arranged on the first circulation loop; and the bladder accumulator is located between the constant-pressure variable-displacement plunger pump and the servo valve and is arranged on the first circulation loop; A sensing monitoring module, comprising a first pressure sensor and a flow sensor, wherein the first pressure sensor is located on the liquid outlet side of the constant pressure variable displacement plunger pump and is arranged on the first circulation loop, and the flow sensor is located on the liquid outlet side of the throttle valve and is arranged on the first circulation loop; The oil quality detection module is connected to the oil tank and is used for quantitatively detecting and analyzing the performance index data of the fire-resistant oil to be tested in the oil tank.

[0008] Optionally, the servo working module further includes a three-way valve, a servo main line and a servo bypass; The liquid outlet end of the constant pressure variable piston pump is connected to the liquid inlet end of the three-way valve, one of the liquid outlet ends of the three-way valve is connected to the liquid inlet end of the throttle valve through the servo main line, and the other liquid outlet end of the three-way valve is connected to the liquid inlet end of the throttle valve through the servo bypass, and the servo valve is arranged on the servo main line.

[0009] Optionally, the operating condition simulation module also includes a filtering unit, which includes a primary filter, a secondary filter and a tertiary filter. The primary filter is located in the oil tank and connected to the liquid inlet end of the first circulation loop. The secondary filter is located between the first pressure sensor and the bladder accumulator and is arranged on the first circulation loop. The tertiary filter is located between the flow sensor and the oil tank and is arranged on the first circulation loop.

[0010] Optionally, the phosphate ester fire-resistant oil operating condition simulation system also includes an electrical control module, which includes a main control unit, and an Internet of Things unit and a touch display unit electrically connected to the main control unit, respectively. The main control unit is electrically connected to the constant pressure variable piston pump, the first pressure sensor and the flow sensor, respectively, and the Internet of Things unit interacts with the remote server through wireless transmission.

[0011] Optionally, the operating condition simulation module also includes a radiator, which is located between the flow sensor and the oil tank and is arranged on the first circulation loop. The sensor monitoring module also includes a second pressure sensor, which is located between the radiator and the oil tank and is arranged on the first circulation loop. The radiator and the second pressure sensor are electrically connected to the main control unit respectively.

[0012] Optionally, the operating condition simulation module also includes a first vacuum gauge and a one-way valve, the first vacuum gauge is located on the liquid inlet side of the constant pressure variable piston pump and is arranged on the first circulation loop, and the first vacuum gauge is electrically connected to the main control unit, and the one-way valve is located on the liquid outlet side of the constant pressure variable piston pump and is arranged on the first circulation loop.

[0013] Optionally, the top of the fuel tank is provided with a fuel filling port and an atmospheric communication port, a respirator is provided in the atmospheric communication port, the respirator has a built-in color-changing silica gel core, a heater is provided in the fuel tank, and a catalyst unit is provided in the fuel tank at a position corresponding to the atmospheric communication port; The sensing monitoring module further includes a liquid level sensor disposed on the outer side wall of the oil tank and a temperature sensor disposed inside the oil tank. The liquid level sensor, the temperature sensor and the heater are electrically connected to the main control unit respectively.

[0014] Optionally, a partition with an open top and an open bottom plate is vertically arranged in the oil tank, and the internal space of the oil tank located on one side of the partition is an oil return space, and the internal space located on the other side of the partition is an oil outlet space; The temperature sensor and the heater are both arranged in the oil outlet space, and the liquid inlet end of the first circulation loop is connected to the bottom of the oil outlet space. The catalyst unit is arranged in the oil return space, and the liquid return end of the first circulation loop is connected to the top gap and the bottom opening of the oil return space.

[0015] Optionally, the oil detection module includes an online monitoring unit and a sampling unit; The online monitoring unit includes a second circulation loop, a metering pump, and an online monitor. The liquid inlet end of the second circulation loop is connected to the bottom of the oil tank, and the liquid return end of the second circulation loop is connected to the top of the oil tank. The metering pump is arranged on the second circulation loop, and the online monitor is located on the liquid outlet side of the metering pump and connected to the second circulation loop, so that the online monitor performs online detection of performance indicators of the passing oil according to preset standards. The sampling unit includes a sampling pipeline and a sampling valve. The liquid inlet end of the sampling pipeline is connected to the bottom of the oil tank, and the sampling valve is arranged on the sampling pipeline.

[0016] The present invention also provides a working condition simulation method, which uses the above-mentioned phosphate ester fire-resistant oil operating condition simulation system, characterized in that the working condition simulation method includes: The variable frequency motor is set to manual mode, the variable frequency motor is set to drive the constant pressure variable displacement piston pump to operate at a first output power, and the throttle valve is adjusted to a first opening, so as to control the anti-fire oil to be tested in the oil tank to flow along the first circulation loop, and the work done by the constant pressure variable displacement piston pump to increase the oil temperature; When the temperature of the anti-oil to be tested rises to a preset temperature, the variable frequency motor is set to an automatic mode, and according to the working pressure of the steam turbine speed control system, the variable frequency motor is set to drive the constant pressure variable piston pump to operate at a second output power, and according to the flow speed of the steam turbine speed control system, the opening of the throttle valve is reduced to a second opening; The servo valve is started to observe the influence of the flow aging of the fire-resistant oil to be tested on the servo valve, and the performance index data of the fire-resistant oil to be tested during the aging process is tracked and detected by the oil detection module.

[0017] Compared with the prior art, the phosphate ester fire-resistant oil operating condition simulation system and operating condition simulation method provided by the embodiments of the present invention have the following advantages: The system is equipped with an operating condition simulation module, a servo operation module, a sensor monitoring module, and an oil quality testing module. A variable-frequency motor drives a constant-pressure variable displacement piston pump, allowing different rated operating pressures to be set according to test requirements. The throttle valve is configured to control the flow rate through the first circulation loop to a preset flow rate by adjusting the throttle valve opening. Real-time data acquisition from the first pressure sensor and flow sensor simulates the operating pressure and flow rate of the turbine speed control system, thereby accurately simulating the operating environment of the fire-resistant oil under actual operating conditions. Furthermore, the servo valve, a core precision component in the steam turbine speed control system, tracks the impact of performance degradation caused by fire-resistant oil aging, such as increased acidity, decreased resistivity, and sludge deposition, on servo valve operation, thereby facilitating the reliability assessment of the fire-resistant oil during operation. The oil quality testing module then quantitatively detects and analyzes performance indicators of the fire-resistant oil in the tank, providing comprehensive tracking of the fire-resistant oil aging process, enabling a comprehensive understanding of the aging process of phosphate ester fire-resistant oil and effectively reflecting the various performance indicators of phosphate ester fire-resistant oil under actual operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments, in which: Figure 1 A schematic diagram of the overall structure of a phosphate ester fire-resistant oil operating condition simulation system provided by an embodiment of the present invention; Figure 2 A comparative trend chart showing the changes in acid values ​​of different phosphate fire-resistant oils during the measurement process provided in an embodiment of the present invention; Figure 3 This is a comparative trend chart of the resistivity changes of different phosphate fire-resistant oils during the measurement process provided by an embodiment of the present invention.

[0019] The reference numerals in the figures are: 1. Working condition simulation module; 11. First circulation loop; 12. Fuel tank; 121. Breather; 122. Heater; 123. Catalyst unit; 124. Partition; 13. Constant pressure variable piston pump; 14. Throttle valve; 15. Frequency conversion motor; 17. Radiator; 18. First vacuum gauge; 19. Check valve; 2. Servo working module; 21. Servo valve; 22. Bladder accumulator; 23. Three-way valve; 24. Servo main line; 25. Servo side; 3. Sensor monitoring module; 31. First pressure sensor; 32. Flow sensor; 33. Second pressure sensor; 34. Liquid level sensor; 35. Temperature sensor; 4. Oil quality detection module; 41. Second circulation loop; 42. Metering pump; 43. Online monitor; 44. Sampling line; 45. Sampling valve; 5. Primary filter; 6. Secondary filter; 7. Tertiary filter; 8. Electrical control module. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. Now, in conjunction with the accompanying drawings, the preferred embodiments of the present invention will be described in detail.

[0021] The present invention discloses a phosphate ester fire-resistant oil operation condition simulation system, such as Figure 1 As shown, the system comprises an operating condition simulation module 1, a servo operating module 2, a sensor monitoring module 3, and an oil quality detection module 4. The operating condition simulation module 1 includes a first circulation loop 11, and a fuel tank 12, a constant pressure variable piston pump 13, and a throttle valve 14, which are sequentially connected through the first circulation loop 11. The liquid inlet of the first circulation loop 11 is connected to the bottom of the fuel tank 12, and the liquid return of the first circulation loop 11 is connected to the top of the fuel tank 12. The drive input of the constant pressure variable piston pump 13 is connected to a variable frequency motor 15, so that the constant pressure variable piston pump 13 and the throttle valve 14 simulate the operating pressure and flow rate of the steam turbine speed control system, respectively. The servo operating module 2 includes a servo valve 21 and a bladder accumulator 22. The servo valve 21 is located between the constant pressure variable piston pump 13 and the throttle valve 14 on the first circulation loop 11. The bladder accumulator 22 is located between the constant pressure variable piston pump 13 and the servo valve 21 on the first circulation loop 11. The sensing and monitoring module 3 includes a first pressure sensor 31 and a flow sensor 32. The first pressure sensor 31 is located on the outlet side of the constant-pressure variable displacement piston pump 13 and is arranged on the first circulation loop 11. The flow sensor 32 is located on the outlet side of the throttle valve 14 and is arranged on the first circulation loop 11. The oil quality detection module 4 is connected to the fuel tank 12 and is used to quantitatively detect and analyze the performance indicators of the fire-resistant oil to be tested in the fuel tank 12.

[0022] Through the implementation of the above-described embodiment of the phosphate ester fire-resistant oil operating condition simulation system, a variable-frequency motor 15 drives a constant-pressure variable-displacement piston pump 13, allowing different rated operating pressures to be set according to test requirements. The throttle valve 14 is configured and its opening is adjusted to control the flow rate of the fire-resistant oil under test through the first circulation loop 11 to the operating flow rate. The first pressure sensor 31 collects the operating pressure at the outlet of the constant-pressure variable-displacement piston pump 13, and the flow rate at the outlet of the throttle valve 14 is collected in real time by the flow sensor 32. This allows for precise control of the rated operating pressure of the constant-pressure variable-displacement piston pump 13 and the opening of the throttle valve 14, thereby accurately simulating the operating pressure and flow rate of the steam turbine speed control system. As the fire-resistant oil under test in the fuel tank 12 flows through the first circulation loop 11, it gradually ages under the influence of the simulated operating conditions, effectively and accurately reflecting the performance changes of the fire-resistant oil under actual operating conditions. Simultaneously, the servo valve 21 on the first circulation loop 11 simulates the speed control component at the heart of the steam turbine's speed control system. The fire-resistant oil to be tested in the oil tank 12 flows through the servo valve 21 along the first circulation loop 11. By starting the servo valve 21 and adjusting its operating state, the servo valve 21 can be periodically or continuously tested throughout the entire operating condition simulation process. By tracking the impact of performance degradation caused by aging of the fire-resistant oil, such as increased acidity, decreased resistivity, and sludge deposition, on the servo valve's operation, the reliability of the fire-resistant oil during use can be assessed. Preferably, after the test, the servo valve 21 can be disassembled to inspect its internal corrosion and sludge deposition.

[0023] Among them, the use of a constant pressure variable plunger pump 13 can reduce the system pressure shock during the adjustment process of the servo valve 21, which is beneficial to the stable operation of the equipment. However, since the variable frequency motor 15 drives the constant pressure variable plunger pump 13 to output high-pressure pulse oil, the setting of the bladder accumulator 22 is used to further absorb the pulse oil pressure output by the constant pressure variable plunger pump 13, reduce pipeline vibration, and ensure the stability of the system pressure. After the fire-resistant oil to be tested in the oil tank 12 passes through the working condition simulation module 1 and returns to the oil tank 12, the performance index data of the fire-resistant oil to be tested in the oil tank 12 is quantitatively detected and analyzed by the oil quality detection module 4, which can provide full tracking of the fire-resistant oil aging process, and then fully understand the aging process of phosphate ester fire-resistant oil, and can effectively reflect the various performance indicators of phosphate ester fire-resistant oil in actual working conditions.

[0024] Furthermore, the servo working module 2 further includes a three-way valve 23, a servo main line 24 and a servo bypass line 25; The liquid outlet of the constant pressure variable piston pump 13 is connected to the liquid inlet of the three-way valve 23. One liquid outlet of the three-way valve 23 is connected to the liquid inlet of the throttle valve 14 through the servo main line 24, and the other liquid outlet of the three-way valve 23 is connected to the liquid inlet of the throttle valve 14 through the servo bypass line 25. The servo valve 21 is set on the servo main line 24.

[0025] Through the implementation of the above-described embodiment of the phosphate ester fire-resistant oil operating condition simulation system, due to the relatively high cost of servo valve 21, it is sufficient to only periodically test and observe its operation throughout the operating condition simulation. When servo valve 21 is not being tested, the three-way valve 23 is controlled to switch the servo bypass line 25 open, allowing the oil at the outlet of the constant-pressure variable displacement piston pump 13 to flow directly along the servo bypass line 25 into the throttle valve 14, completing the operating condition simulation.

[0026] Furthermore, the operating condition simulation module 1 also includes a filtering unit, which includes a primary filter 5, a secondary filter 6 and a tertiary filter 7. The primary filter 5 is located in the oil tank 12 and connected to the liquid inlet end of the first circulation loop 11. The secondary filter 6 is located between the first pressure sensor 31 and the bladder accumulator 22 and is arranged on the first circulation loop 11. The tertiary filter 7 is located between the flow sensor 32 and the oil tank 12 and is arranged on the first circulation loop 11.

[0027] Through the implementation of the above-described embodiment of the phosphate ester fire-resistant fuel oil operating condition simulation system, the primary filter 5, secondary filter 6, and tertiary filter 7 are preferably high-precision, high-flow precision filtration instruments. Utilizing this multi-stage filtration setup, the primary filter 5 performs primary filtration of the fire-resistant fuel oil entering the first circulation loop 11 from the fuel tank 12, preventing particulate matter from damaging subsequent equipment. The secondary filter 6 performs secondary filtration of the fire-resistant fuel oil output from the constant-pressure variable piston pump 13 and entering the servo valve 21 or throttle valve 14, thereby improving the cleanliness of the fire-resistant fuel oil. The tertiary filter 7 further filters the fire-resistant fuel oil flowing out of the throttle valve 14 and back into the fuel tank 12, further ensuring the cleanliness of the fire-resistant fuel oil and preventing particulate matter from settling at the bottom of the fuel tank 12 and affecting its quality, ensuring that the oil meets the required test specifications. This three-stage filtration provides comprehensive protection for the operating condition simulation system and the fire-resistant fuel oil testing, ensuring stable operation and long-term reliability of the system.

[0028] Furthermore, the phosphate ester fire-resistant oil operating condition simulation system also includes an electrical control module 8, which includes a main control unit, an Internet of Things unit and a touch display unit electrically connected to the main control unit. The main control unit is electrically connected to the constant pressure variable piston pump 13, the first pressure sensor 31 and the flow sensor 32 respectively, and the Internet of Things unit interacts with the remote server through wireless transmission.

[0029] In the implementation of the above-described phosphate ester fire-resistant oil operating condition simulation system, the main control unit is preferably a PLC (Programmable Logic Controller) or a single-chip microcomputer, electrically connected to the constant-pressure variable displacement piston pump 13, the first pressure sensor 31, and the flow sensor 32 via a digital I / O interface. The main control unit is configured to acquire data collected by the first pressure sensor 31, the flow sensor 32, and other sensors in real time, compare the collected data with set values, and, based on the comparison results, control and adjust the output of the constant-pressure variable displacement piston pump 13 and the throttle valve 14 to reach the set values, ensuring that the entire test process is carried out within the set conditions. Automatic shutdown is also performed when necessary to ensure safety. The touch display unit is preferably an HMI (Human-Machine Interface) touch screen, connected to the main control unit via a serial interface (such as RS-485 or RS-232), allowing operators to operate the system via touchscreen. The Internet of Things unit is preferably a Wi-Fi module (Wireless Fidelity) or a cellular module, which exchanges data with a remote server via a wireless interface, allowing remote operators to query data on the client at any time.

[0030] Furthermore, the operating condition simulation module 1 also includes a radiator 17, which is located between the flow sensor 32 and the fuel tank 12 and is arranged on the first circulation loop 11. The sensor monitoring module 3 also includes a second pressure sensor 33, which is located between the radiator 17 and the fuel tank 12 and is arranged on the first circulation loop 11. The radiator 17 and the second pressure sensor 33 are respectively electrically connected to the main control unit.

[0031] Through the implementation of the above-described embodiment of the phosphate ester fire-resistant oil operating condition simulation system, the radiator 17 is preferably air-cooled, eliminating the need for cooling water. This provides advantages such as safety, compact size, and convenient deployment. It is used to cool the fire-resistant oil under test within the first circulation loop 11, thereby reducing the rate of temperature rise caused by the work of the constant-pressure variable displacement piston pump 13. The second pressure sensor 33 is configured to monitor the return oil pressure in real time. Preferably, the second pressure sensor 33 is positioned on the oil inlet side of the tertiary filter 7 to prevent insufficient oil pressure entering the filter, thereby ensuring proper operation of the filter.

[0032] Furthermore, the operating condition simulation module 1 also includes a first vacuum gauge 18 and a one-way valve 19. The first vacuum gauge 18 is located on the liquid inlet side of the constant pressure variable piston pump 13 and is arranged on the first circulation loop 11. The first vacuum gauge 18 is electrically connected to the main control unit, and the one-way valve 19 is located on the liquid outlet side of the constant pressure variable piston pump 13 and is arranged on the first circulation loop 11.

[0033] Through the implementation of the above-described embodiment of the phosphate ester fire-resistant oil operating condition simulation system, the configuration of the first vacuum gauge 18 allows for a specific vacuum value to be set according to test requirements, and can also obtain the vacuum value at the liquid inlet end of the first circulation loop 11 and transmit it to the main control unit. This set value is generally used to define the normal operating conditions of the constant-pressure variable piston pump 13. When the vacuum value within the first circulation loop 11 falls below the set value, a corresponding protection or alarm mechanism can be triggered. This maintains a certain vacuum level within the first circulation loop 11, serving as a protective parameter for the operation of the constant-pressure variable piston pump 13 and promoting the flow of the fire-resistant oil to be tested within the first circulation loop 11. Preferably, the pressure of the constant-pressure variable piston pump 13 can be adjusted within a range of 0 MPa to 25 MPa. In addition, a one-way valve 19 is provided to prevent the fire-resistant oil to be tested from flowing back within the first circulation loop 11 and damaging the constant-pressure variable piston pump 13 when the constant-pressure variable piston pump 13 stops.

[0034] Furthermore, the top of the fuel tank 12 is provided with a fuel filling port and an atmospheric communication port, a respirator 121 is provided in the atmospheric communication port, and the respirator 121 has a color-changing silica gel core built in. A heater 122 is provided in the fuel tank 12, and a catalyst unit 123 is provided in the position corresponding to the atmospheric communication port in the fuel tank 12; The sensing monitoring module 3 further includes a liquid level sensor 34 disposed on the outer wall of the oil tank 12 and a temperature sensor 35 disposed inside the oil tank 12 . The liquid level sensor 34 , the temperature sensor 35 and the heater 122 are electrically connected to the main control unit respectively.

[0035] Through the implementation of the above-described embodiment of the phosphate ester fire-resistant oil operating condition simulation system, the liquid level sensor 34 can be used to collect and display the liquid level of the fire-resistant oil to be tested within the fuel tank 12 in real time, allowing for precise control of the injection volume of the fire-resistant oil to be tested within the fuel tank 12 and facilitating subsequent quantitative evaluation of the fire-resistant oil's performance. An atmospheric connection port is provided to connect the fuel tank 12 to the atmosphere, thereby causing oxidation and aging of the fire-resistant oil to be tested within the fuel tank 12, thereby promoting changes in the fire-resistant oil's performance. A respirator 121 with a built-in color-changing silicone core is provided at the atmospheric connection port. This ensures that the fuel tank 12 is connected to the atmosphere while effectively removing moisture from the air, thereby preventing it from affecting the aging reaction and performance measurement of the fire-resistant oil to be tested within the fuel tank 12.

[0036] The catalyst unit 123 is preferably a catalyst that promotes the reaction between the fire-resistant oil to be tested and oxygen, such as copper. The amount of the active component of the catalyst is 0.02% to 0.05% of the mass of the fire-resistant oil to be tested. It can be reused after cleaning and activation to save costs and accelerate the reaction rate of the fire-resistant oil to be tested in the fuel tank 12 with the oxygen to undergo oxidation aging. The catalyst unit 123 must be well protected to prevent oxidation failure, and the interval between placing the catalyst unit 123 in the fuel tank 12 and injecting the fire-resistant oil to be tested into the fuel tank 12 must not exceed sixty minutes. The temperature sensor 35 is preferably a thermocouple or a thermistor sensor, which is used to collect the oil temperature of the fire-resistant oil to be tested in the fuel tank 12. The heater 122 is preferably an electric heating or infrared heating mode, which is used to heat the phosphate fire-resistant oil in the fuel tank 12 at low temperatures to improve fluidity and facilitate the normal operation of the constant pressure variable piston pump 13. The heater 122 controls the oil operating temperature to be between 60° C. and 80° C., which can further promote the reaction rate and shorten the aging time of the fire-resistant oil to be tested in the oil tank 12 , thereby shortening the test time and saving costs.

[0037] Furthermore, a partition plate 124 with an open top and an opening at the bottom is vertically provided in the oil tank 12. The internal space of the oil tank 12 on one side of the partition plate 124 is an oil return space, and on the other side of the partition plate 124 is an oil outlet space. The temperature sensor 35 and the heater 122 are both arranged in the oil outlet space, and the liquid inlet end of the first circulation loop 11 is connected to the bottom of the oil outlet space. The catalyst unit 123 is arranged in the return oil space, and the return liquid end of the first circulation loop 11 is connected to the top gap and the bottom opening of the return oil space.

[0038] Through the implementation of the above-described embodiment of the phosphate ester fire-resistant oil operating condition simulation system, the fuel tank 12 is preferably made of stainless steel. When the fire-resistant oil to be tested within the first circulation loop 11 returns to the return oil space, the catalyst unit 123 accelerates the rate of oxygen aging of the fire-resistant oil to be tested, which may contain entrained bubbles, impact bubbles, etc. The provision of the partition 124 allows the entrained bubbles, impact bubbles, etc. contained in the return oil to be fully released within the return oil space, then flow through the top of the partition 124 into the oil outlet space, and then re-enter the first circulation loop 11 for circulation, thereby effectively improving the stability of the oil supply within the oil outlet chamber.

[0039] Furthermore, the oil detection module 4 includes an online monitoring unit and a sampling unit; The online monitoring unit includes a second circulation loop 41, a metering pump 42, and an online monitor 43. The liquid inlet end of the second circulation loop 41 is connected to the bottom of the oil tank 12, and the liquid return end of the second circulation loop 41 is connected to the top of the oil tank 12. The metering pump 42 is arranged on the second circulation loop 41, and the online monitor 43 is located on the liquid outlet side of the metering pump 42 and connected to the second circulation loop 41, so that the online monitor 43 can perform online detection of the performance indicators of the passing oil according to preset standards; The sampling unit includes a sampling pipeline 44 and a sampling valve 45 . The liquid inlet end of the sampling pipeline 44 is connected to the bottom of the oil tank 12 , and the sampling valve 45 is provided on the sampling pipeline 44 .

[0040] Through the implementation of the above-described embodiment of the phosphate ester fire-resistant oil operating condition simulation system, two detection methods, an online monitoring unit and a sampling unit, are used in synergy. When the fire-resistant oil to be tested in the fuel tank 12 flows along the first circulation loop 11, the metering pump 42 is activated to precisely control the flow of the fire-resistant oil to be tested in the fuel tank 12 along the second circulation loop 41 according to a preset flow rate. The online monitor 43 then monitors the changes in various indicators of the fire-resistant oil during the aging process in real time. The online monitor 43 is preferably a multifunctional oil quality testing device that can provide real-time online monitoring and analysis of oil quality. It is primarily used for online detection of three key performance indicators, such as particle size, moisture content, and resistivity, and uses these as reference values ​​to track the entire fire-resistant oil aging process. At the same time, sampling valve 45 can be periodically opened to sample the fire-resistant oil in tank 12 at different stages of aging. These samples are then sent for testing to further comprehensively analyze the performance of the fire-resistant oil. Preferably, the sixteen performance indicators specified in DL / T 571-2024, "Guidelines for the Operation and Maintenance of Phosphate Ester Fire-Resistant Oils for Power Plants," such as particle size, acid value, moisture content, resistivity, flash point, autoignition point, density, and kinematic viscosity, can be included to more comprehensively analyze the performance changes of the phosphate ester fire-resistant oil during aging. The provision of an online monitoring unit allows for full monitoring of oil quality changes, effectively preventing test data loss due to untimely sampling or sudden changes in oil quality.

[0041] The present invention also provides a working condition simulation method, which uses the above-mentioned phosphate ester fire-resistant oil operating condition simulation system, characterized in that the working condition simulation method includes: The variable frequency motor 15 is set to manual mode, and the variable frequency motor 15 is set to drive the constant pressure variable piston pump 13 to operate at a first output power, and the throttle valve 14 is adjusted to a first opening, so that the fire-resistant oil to be tested in the oil tank 12 flows along the first circulation loop 11, and the work done by the constant pressure variable piston pump 13 increases the oil temperature; When the temperature of the anti-oil to be tested rises to a preset temperature, the variable frequency motor 15 is set to automatic mode. According to the working pressure of the steam turbine speed control system, the variable frequency motor 15 is set to drive the constant pressure variable displacement plunger pump 13 to operate at the second output power, and according to the flow speed of the steam turbine speed control system, the opening of the throttle valve 14 is reduced to the second opening. The servo valve 21 is started to observe the influence of the flow aging of the fire-resistant oil under test on the servo valve 21 , and the performance index data of the fire-resistant oil under test during the aging process is tracked and detected by the oil quality detection module 4 .

[0042] Through the implementation of the above-mentioned working condition simulation method embodiment, the first output power of the constant pressure variable piston pump 13 is preferably set at 50%, and the opening of the throttle valve 14 is adjusted to 75%. The allowable operating temperature of the constant pressure variable piston pump 13 is preferably not less than 30°C, and the working set temperature to which the anti-fuel oil to be tested is raised by the constant pressure variable piston pump 13 is preferably 60-90°C. The variable frequency motor 15 is controlled to drive the constant pressure variable piston pump 13 at the second output power to operate the simulated steam turbine speed control system. The working pressure setting value is preferably 11.2Mpa or 14.5Mpa, and the opening of the throttle valve 14 is adjusted to reduce the flow rate of the steam turbine speed control system, so that the flow setting value under the simulated working condition is preferably 25±0.5L / min.

[0043] Specifically, the above-mentioned phosphate ester fire-resistant oil operating condition simulation system and operating condition simulation method are used to conduct a comprehensive tracking test based on the changes in two typical indicators, acid value and resistivity, during the test of brand A fire-resistant oil and brand B fire-resistant oil. The following examples are provided: The injection volume of the fire-resistant oil was set at 350L, the output power of the high-pressure oil pump assembly was set at 65%, the copper catalyst dosage was set at 0.02% of the mass of the fire-resistant oil to be tested, the operating temperature was set at 80°C, the operating pressure was set at 14.5 MPa, and the flow rate was set at 25.0 L / min. Under these conditions, tests were conducted on Brand A and Brand B fire-resistant oils.

[0044] The changes of two typical indicators, acid value and resistivity, during the test are as follows: Figure 2 and Figure 3 As shown. Figure 2 As can be seen in the figure, the acid value of fire-resistant oil A was 0.018 mgKOH / g at the beginning of the test, and reached 0.126 mgKOH / g by the 50th day, with an increase of 0.108 mgKOH / g. The acid value of fire-resistant oil B was 0.037 mgKOH / g at the beginning of the test, and reached 0.102 mgKOH / g by the 50th day, with an increase of 0.65 mgKOH / g. The rate of increase in the acid value of fire-resistant oil A was significantly higher than that of fire-resistant oil B, indicating that it aged faster than fire-resistant oil B.

[0045] from Figure 3 It can be seen that the resistivity of fire-resistant fuel A is 7.1×10 10 On the 50th day of operation, the acid value and resistivity were 9×10 9 At the beginning of the test, the resistivity of fire-resistant oil B was 5.4×10 10 , the resistivity was 1.2×10 10 , higher than the resistivity of fire-resistant fuel A.

[0046] pass Figure 2 and Figure 3 From the data, it can be found that in terms of acid value and resistivity, the performance indicators of fire-resistant oil B are better than those of fire-resistant oil A, and the anti-aging performance of fire-resistant oil B is better than that of fire-resistant oil A.

[0047] Specifically, the operating condition parameters can be flexibly set according to the evaluation requirements of phosphate ester fire-resistant oil: The injection volume of the fire-resistant oil is set to 330L, the output power of the high-pressure oil pump assembly is set to 60%, the amount of copper catalyst is 0.05% of the mass of the injected fire-resistant oil to be tested, the working set temperature is 70℃, the working pressure set value is set to 11.2Mpa, and the flow rate is set to 24.5L / min.

[0048] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Those skilled in the art may modify the technical solutions described in the above embodiments, or replace some of the technical features therein with equivalents; and all these modifications and replacements should fall within the scope of protection of the present invention.

Claims

1. A phosphate ester fire-resistant oil operating condition simulation system, characterized in that: The phosphate ester fire-resistant oil operation condition simulation system includes: The operating condition simulation module includes a first circulation loop, and an oil tank, a constant-pressure variable piston pump, and a throttle valve connected in sequence through the first circulation loop, wherein the liquid inlet end of the first circulation loop is connected to the bottom of the oil tank, and the liquid return end of the first circulation loop is connected to the top of the oil tank. The drive input end of the constant-pressure variable piston pump is connected to a variable-frequency motor, so that the constant-pressure variable piston pump and the throttle valve respectively simulate the working pressure and flow rate of the steam turbine speed control system; A servo working module, comprising a servo valve and a bladder accumulator, wherein the servo valve is located between the constant-pressure variable-displacement plunger pump and the throttle valve and is arranged on the first circulation loop; and the bladder accumulator is located between the constant-pressure variable-displacement plunger pump and the servo valve and is arranged on the first circulation loop; A sensing monitoring module, comprising a first pressure sensor and a flow sensor, wherein the first pressure sensor is located on the liquid outlet side of the constant pressure variable displacement plunger pump and is arranged on the first circulation loop, and the flow sensor is located on the liquid outlet side of the throttle valve and is arranged on the first circulation loop; The oil quality detection module is connected to the oil tank and is used for quantitatively detecting and analyzing the performance index data of the fire-resistant oil to be tested in the oil tank.

2. The phosphate ester fire-resistant oil operating condition simulation system according to claim 1, characterized in that: The servo working module also includes a three-way valve, a servo main circuit and a servo bypass; The liquid outlet end of the constant pressure variable piston pump is connected to the liquid inlet end of the three-way valve, one of the liquid outlet ends of the three-way valve is connected to the liquid inlet end of the throttle valve through the servo main line, and the other liquid outlet end of the three-way valve is connected to the liquid inlet end of the throttle valve through the servo bypass, and the servo valve is arranged on the servo main line.

3. The phosphate ester fire-resistant oil operating condition simulation system according to claim 1, characterized in that: The operating condition simulation module also includes a filtering unit, which includes a primary filter, a secondary filter and a tertiary filter. The primary filter is located in the oil tank and connected to the liquid inlet end of the first circulation loop. The secondary filter is located between the first pressure sensor and the bladder accumulator and is arranged on the first circulation loop. The tertiary filter is located between the flow sensor and the oil tank and is arranged on the first circulation loop.

4. The phosphate ester fire-resistant oil operating condition simulation system according to claim 1, characterized in that: The phosphate ester fire-resistant oil operating condition simulation system also includes an electrical control module, which includes a main control unit, and an Internet of Things unit and a touch display unit electrically connected to the main control unit respectively. The main control unit is electrically connected to the constant pressure variable piston pump, the first pressure sensor and the flow sensor respectively, and the Internet of Things unit interacts with the remote server through wireless transmission.

5. The phosphate ester fire-resistant oil operating condition simulation system according to claim 4, characterized in that: The operating condition simulation module also includes a radiator, which is located between the flow sensor and the oil tank and is arranged on the first circulation loop. The sensor monitoring module also includes a second pressure sensor, which is located between the radiator and the oil tank and is arranged on the first circulation loop. The radiator and the second pressure sensor are respectively electrically connected to the main control unit.

6. The phosphate ester fire-resistant oil operating condition simulation system according to claim 4, characterized in that: The operating condition simulation module also includes a first vacuum gauge and a one-way valve. The first vacuum gauge is located on the liquid inlet side of the constant pressure variable piston pump and is arranged on the first circulation loop. The first vacuum gauge is electrically connected to the main control unit. The one-way valve is located on the liquid outlet side of the constant pressure variable piston pump and is arranged on the first circulation loop.

7. The phosphate ester fire-resistant oil operating condition simulation system according to claim 4, characterized in that: The top of the fuel tank is provided with a fuel filling port and an atmospheric communication port, a respirator is provided in the atmospheric communication port, and a color-changing silica gel core is built into the respirator. A heater is provided in the fuel tank, and a catalyst unit is provided in the fuel tank at a position corresponding to the atmospheric communication port. The sensing monitoring module further includes a liquid level sensor disposed on the outer side wall of the oil tank and a temperature sensor disposed inside the oil tank. The liquid level sensor, the temperature sensor and the heater are electrically connected to the main control unit respectively.

8. The phosphate ester fire-resistant oil operating condition simulation system according to claim 7, characterized in that: A partition plate with an open top and an open bottom plate is vertically arranged in the oil tank, and the internal space of the oil tank is located on one side of the partition plate as an oil return space, and on the other side of the partition plate as an oil outlet space; The temperature sensor and the heater are both arranged in the oil outlet space, and the liquid inlet end of the first circulation loop is connected to the bottom of the oil outlet space. The catalyst unit is arranged in the oil return space, and the liquid return end of the first circulation loop is connected to the top gap and the bottom opening of the oil return space.

9. The phosphate ester fire-resistant oil operating condition simulation system according to claim 1, characterized in that: The oil product detection module includes an online monitoring unit and a sampling unit; The online monitoring unit includes a second circulation loop, a metering pump, and an online monitor. The liquid inlet end of the second circulation loop is connected to the bottom of the oil tank, and the liquid return end of the second circulation loop is connected to the top of the oil tank. The metering pump is arranged on the second circulation loop, and the online monitor is located on the liquid outlet side of the metering pump and connected to the second circulation loop, so that the online monitor performs online detection of performance indicators of the passing oil according to preset standards. The sampling unit includes a sampling pipeline and a sampling valve. The liquid inlet end of the sampling pipeline is connected to the bottom of the oil tank, and the sampling valve is arranged on the sampling pipeline.

10. A method for simulating working conditions, using the phosphate ester fire-resistant oil operating condition simulation system according to any one of claims 1 to 9, characterized in that: The working condition simulation method comprises: The variable frequency motor is set to manual mode, the variable frequency motor is set to drive the constant pressure variable displacement piston pump to operate at a first output power, and the throttle valve is adjusted to a first opening, so as to control the anti-fire oil to be tested in the oil tank to flow along the first circulation loop, and the work done by the constant pressure variable displacement piston pump to increase the oil temperature; When the temperature of the anti-oil to be tested rises to a preset temperature, the variable frequency motor is set to an automatic mode, and according to the working pressure of the steam turbine speed control system, the variable frequency motor is set to drive the constant pressure variable piston pump to operate at a second output power, and according to the flow speed of the steam turbine speed control system, the opening of the throttle valve is reduced to a second opening; The servo valve is started to observe the influence of the flow aging of the fire-resistant oil to be tested on the servo valve, and the performance index data of the fire-resistant oil to be tested during the aging process is tracked and detected by the oil detection module.

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