Dynamic determination system and determination method for performance of phosphate fire-resistant oil

Abstract

The invention relates to the technical field of phosphate fire-resistant oil production, in particular to a dynamic determination system and method for the performance of phosphate fire-resistant oil. The system comprises a fuel oxidation resistant module, a circular flow module, a working condition simulation module and a control detection module. The fuel oxidation resistant module comprises an oil tank and a catalysis unit and a heating unit which are arranged in the oil tank, the circulating flow module comprises a first circulating loop and a circulating oil pump, and the working condition simulation module comprises a second circulating loop, an oil pump assembly and a throttling assembly. The oil pump assembly and the throttling assembly are used for simulating the working pressure and the flowing speed of the steam turbine speed regulating system. The control detection module comprises an electrical control unit, an on-line monitoring unit and a sampling unit, and is used for obtaining performance indexes of to-be-detected fire-resistant oil in the oil tank in the aging process. According to the method, the index change condition of the phosphate fire-resistant oil in the aging process under the simulated field working condition can be comprehensively tracked and obtained, so that the performance of the fire-resistant oil can be accurately evaluated.

Description

Technical Field

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

[0002] Phosphate ester fire-resistant oil has excellent flame retardant properties. As a fire-resistant hydraulic oil, it is widely used in the electro-hydraulic control system of generator sets, effectively reducing the fire accidents caused by the leakage of hydraulic oil in the generator set control system to the surface of high-temperature objects. However, since phosphate ester fire-resistant oil is an ester-based synthetic oil, its main component is triaryl phosphate. During use, it is easily affected by comprehensive factors such as heat, oxygen, water, chemical media, and mechanical forces, resulting in aging and deterioration. Its chemical composition and molecular structure will change, and its physical and chemical properties will also change accordingly, thus affecting its use performance.

[0003] The deterioration of the performance of phosphate ester fire-resistant oil is mainly manifested as the deepening of the oil color, the increase of acid value, the decrease of resistivity, the increase of air release value and foam characteristics. In severe cases, sludge and paint film will be generated. The increase of acid value and the decrease of resistance will cause corrosion of the components in the fire-resistant oil system, affecting the stability and safety of the system; the increase of air release value and foam characteristics will cause bubbles to be carried in the fire-resistant oil, resulting in unstable system pressure or vibration of equipment and pipelines; when the sludge and paint film generated by oil aging adhere to the filter screen in the fire-resistant oil system, it will cause the filter screen to be blocked, and in severe cases, it will lead to insufficient oil supply by the oil pump and a decrease in oil pressure; when the sludge precipitates, it will also cause the oil particle size to be unqualified, and in severe cases, it will cause servo valve jamming and system refusal to operate. When the performance indicators of the fire-resistant oil are unqualified, it is necessary to restore the oil quality by means of supplementing new oil, replacing old oil or regeneration treatment to ensure the normal operation of the system. However, using the above methods to restore the oil quality will cause oil loss and increase the operation and maintenance costs. Therefore, by scientifically and effectively screening out the phosphate ester fire-resistant oil with the best anti-aging performance, the safety, stability and economy of the operation of the fire-resistant oil system can be effectively improved.

[0004] At present, the evaluation methods for the anti-aging performance of phosphate ester fire-resistant oil mainly include DL / T 1705-2017 "Closed Cup Aging Determination Method for Phosphate Ester Fire-Resistant Oil", DL / T 429.6-2015 "Open Cup Aging Determination Method for Electric Power Oils", and DL / T 1654-2016 "Test Method for Oxidation Stability and Corrosion of Phosphate Ester Fire-Resistant Oil". The above three evaluation methods are all to accelerate the aging of phosphate ester fire-resistant oil in a closed environment, an open environment and a pure oxygen environment respectively under certain temperature and the presence of a catalyst, and judge its aging situation by measuring the changes in acid value, sludge or the mass of metal test pieces before and after oil aging. The smaller the increase in acid value, the smaller the amount of sludge precipitation or the smaller the change in the mass of metal test pieces, the better the anti-aging performance of the phosphate ester fire-resistant oil.

[0005] However, the above three evaluation methods all belong to static tests, and the oil products are in a steady-state working condition during the tests, which is very different from the actual operating conditions of phosphate ester fire-resistant oil as a hydraulic working medium. They cannot effectively reflect the aging situation of the fire-resistant oil under actual conditions and the impact of the oil product aging process on the entire regulating system. In addition, the above three evaluation methods can only detect the samples at the end of the test and cannot monitor the entire process of the change in the performance of the oil product. At the same time, due to the small amount of samples and single detection items, the change situation of various performance indicators during the aging process of the oil product cannot be fully reflected. Summary of the Invention

[0006] The technical problem to be solved by the embodiments of the present invention is to provide a dynamic determination system and method for the performance of phosphate ester fire-resistant oil to solve the problem that the existing tests of phosphate ester fire-resistant oil cannot effectively reflect various performance indicators under actual conditions.

[0007] The present invention discloses a dynamic determination system for the performance of phosphate ester fire-resistant oil, including: An anti-fire-resistant oil oxidation module, including an oil tank and a catalytic unit and a heating unit arranged in the oil tank. An anti-fire-resistant oil injection port and an air communication port are respectively arranged on the oil tank; A circulating flow module, including a first circulation loop and a circulation oil pump. The liquid inlet end of the first circulation loop is connected to the bottom of the oil tank, and the liquid outlet end of the first circulation loop is connected to the top of the oil tank. The circulation oil pump is arranged on the first circulation loop; A working condition simulation module, including a second circulation loop, a pump assembly and a throttling assembly. The liquid inlet end of the second circulation loop is connected to the bottom of the oil tank, and the liquid outlet end of the second circulation loop is connected to the top of the oil tank. The pump assembly and the throttling assembly are both arranged on the second circulation loop, and are used to simulate the working pressure and flow velocity of the steam turbine governing system, and the pressure output by the circulation oil pump is lower than the pressure output by the pump assembly; A control and detection module, including an electrical control unit, an on-line monitoring unit and a sampling unit. The electrical control unit is respectively electrically connected to the heating unit, the circulation oil pump, the pump assembly and the throttling assembly, and the electrical control unit performs data interaction with a remote server. The on-line monitoring unit is connected to the oil tank and is used to on-line obtain the performance indicators during the aging process of the anti-fire-resistant oil to be tested in the oil tank. The sampling unit is connected to the oil tank and is used to sample and analyze the anti-fire-resistant oil to be tested in the oil tank during the aging process at different stages.

[0008] Optionally, the working condition simulation module further includes a servo working unit, and the servo working unit includes a three-way valve and a servo valve; The liquid outlet end of the oil pump assembly is connected to the liquid inlet end of the three-way valve. One liquid outlet end of the three-way valve is connected to the liquid inlet end of the throttling assembly through the servo main path, and the other liquid outlet end of the three-way valve is connected to the liquid inlet end of the throttling assembly through the servo bypass. The servo valve is arranged on the servo main path.

[0009] Optionally, the oil pump assembly includes a variable-frequency motor and a constant-pressure variable plunger pump. The constant-pressure variable plunger pump is arranged on the second circulation loop, and the output end of the variable-frequency motor is mechanically connected to the constant-pressure variable plunger pump; The working condition simulation module further includes a first vacuum gauge and a first pressure sensor. The first vacuum gauge is arranged inside the liquid inlet end of the second circulation loop. The first pressure sensor is arranged on the second circulation loop on the liquid outlet side of the constant-pressure variable plunger pump. The first vacuum gauge, the first pressure sensor, the variable-frequency motor, and the constant-pressure variable plunger pump are respectively electrically connected to the electrical control unit.

[0010] Optionally, the throttling assembly includes a throttle valve and a flow sensor. The throttle valve is arranged on the second circulation loop on the liquid outlet side of the constant-pressure variable plunger pump. The flow sensor is electrically connected to the electrical control unit.

[0011] Optionally, the circulation flow module further includes a second vacuum gauge and a second pressure sensor. The second vacuum gauge is arranged inside the liquid inlet end of the first circulation loop. The second pressure sensor is arranged on the first circulation loop on the liquid outlet side of the circulation oil pump. The second vacuum gauge, the second pressure sensor, and the circulation oil pump are respectively electrically connected to the electrical control unit.

[0012] Optionally, the circulation flow module further includes a filter and a radiator. The filter is arranged on the first circulation loop on the liquid outlet side of the circulation oil pump. The radiator is arranged on the first circulation loop on the liquid outlet side of the filter. The radiator is electrically connected to the electrical control unit.

[0013] Optionally, the anti-fuel-oil oxidation module further includes a liquid level sensor and a breather. The liquid level sensor is arranged on the fuel tank. The breather is arranged at the atmospheric communication port, and a discoloring silica gel core is arranged inside the breather. The liquid level sensor is electrically connected to the electrical control unit.

[0014] Optionally, a partition is arranged inside the fuel tank, and the internal space of the fuel tank is separated into an oil outlet chamber and an oil return chamber by the partition. The oil outlet chamber and the oil return chamber are communicated through the gap at the top of the partition and the openings arranged on the bottom plate body; The liquid inlet end of the first circulation loop is connected to the bottom of the oil outlet chamber, and the liquid outlet end of the first circulation loop is connected to the top of the oil outlet chamber. The heating unit includes a temperature sensor and a heater disposed in the oil outlet chamber; The liquid inlet end of the second circulation loop is connected to the bottom of the oil outlet chamber, and the liquid outlet end of the second circulation loop is connected to the top of the oil return chamber. The catalytic unit is disposed in the oil return chamber.

[0015] Optionally, the on-line monitoring unit includes a monitoring loop, a metering pump, and an on-line monitor. The liquid inlet end of the monitoring loop is connected to the bottom of the oil return chamber, and the liquid outlet end of the monitoring loop is connected to the top of the oil return chamber. The metering pump is disposed on the monitoring loop, and the on-line monitor is located on the liquid outlet side of the metering pump and connected to the monitoring loop, so that the on-line monitor performs on-line detection on the performance indexes of the oil passing through according to a preset standard; 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 return chamber, and the sampling valve is disposed on the sampling pipeline.

[0016] The present invention also provides a determination method, which adopts the above-mentioned dynamic determination system for the performance of phosphate ester fire-resistant oil. The determination method includes: Inject the fire-resistant oil to be tested into the fuel tank, start the first circulation loop, and after the fire-resistant oil to be tested flows sufficiently, start the heating unit to raise the temperature of the fire-resistant oil to be tested; When the temperature of the fire-resistant oil to be tested rises to the allowable operating temperature of the oil pump assembly, turn off the heating unit and start the second circulation loop, and continue to raise the temperature of the fire-resistant oil to be tested by the work done by the oil pump assembly; When the oil temperature of the fire-resistant oil to be tested rises to a preset temperature, adjust the power of the oil pump assembly and the opening degree of the throttle assembly to simulate the working pressure and flow velocity of the steam turbine governing system; While the fire-resistant oil to be tested continuously oxidizes along the second circulation loop and returns to the fuel tank, obtain the key performance index data of the fire-resistant oil to be tested in the fuel tank through the on-line monitoring unit, and regularly sample the fire-resistant oil to be tested in the fuel tank through the sampling unit, and measure all the performance indexes of the sampled fire-resistant oil.

[0017] Compared with the prior art, the beneficial effects of the dynamic determination system and determination method for the performance of phosphate ester fire-resistant oil provided by the embodiments of the present invention are as follows: An anti - fuel - oil oxidation module, a circulating flow module, a working condition simulation module, and a control and detection module are set up. The circulating flow module is used to make the anti - fuel - oil to be tested in the fuel tank flow along the first circulation loop to ensure the fluidity of the anti - fuel - oil to be tested in the fuel tank. By controlling the high - pressure oil pump assembly and the throttling assembly in the working condition simulation module to simulate the working pressure and flow velocity of the steam turbine governing system, when the anti - fuel - oil to be tested in the fuel tank flows along the second circulation loop, it can truly and accurately reflect the performance change process of the anti - fuel - oil under actual working conditions. With the setting of the catalytic unit in the fuel tank, the aging reaction rate of the anti - fuel - oil to be tested in the fuel tank with oxygen can be accelerated, and the oil temperature of the anti - fuel - oil to be tested is controlled by the heating unit and the work done by the high - pressure oil pump assembly. And the change data of various indexes during the aging process of the anti - fuel - oil in the fuel tank are obtained through two ways: online monitoring and sampling analysis at different stages, which can provide full - process tracking of the anti - fuel - oil aging process to comprehensively obtain the index change situation of the phosphate anti - fuel - oil during the aging process under simulated on - site working conditions, so as to accurately evaluate the performance of the anti - fuel - oil and guide the research and development of the anti - fuel - oil and the improvement direction of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The technical solutions of the present invention will be further described in detail below in conjunction with the drawings and embodiments. In the drawings: Figure 1 is the overall structural schematic diagram of the dynamic determination system for the performance of phosphate anti - fuel - oil provided by the embodiment of the present invention; Figure 2 is the comparative trend chart of the acid value change of different phosphate anti - fuel - oils during the determination process provided by the embodiment of the present invention; Figure 3 is the comparative trend chart of the resistivity change of different phosphate anti - fuel - oils during the determination process provided by the embodiment of the present invention.

[0019] The reference signs in the drawings are as follows: 1. Anti - fuel - oil oxidation module; 11. Fuel tank; 12. Catalytic unit; 13. Heating unit; 131. Temperature sensor; 132. Heater; 14. Liquid - level sensor; 15. Breather; 16. Partition board; 2. Circulating flow module; 21. First circulation loop; 22. Circulation oil pump; 23. Second vacuum gauge; 24. Second pressure sensor; 25. Filter; 26. Radiator; 3. Working condition simulation module; 31. Second circulation loop; 32. Oil pump assembly; 33. Throttling assembly; 331. Throttle valve; 332. Flow sensor; 34. Three - way valve; 35. Servo valve; 36. Servo main circuit; 37. Servo bypass; 38. First vacuum gauge; 39. First pressure sensor; 4. Electrical control unit; 5. Online monitoring unit; 51. Monitoring loop; 52. Metering pump; 53. Online monitor; 6. Sampling unit; 61. Sampling pipeline; 62. Sampling valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments 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 dynamic determination system for the performance of phosphate ester fire-resistant oil, as Figure 1 shown, which includes a fire-resistant oil oxidation module 1, a circulating flow module 2, a working condition simulation module 3, and a control and detection module. The fire-resistant oil oxidation module 1 includes an oil tank 11, a catalytic unit 12 and a heating unit 13 arranged in the oil tank 11. An injection port for fire-resistant oil and an air communication port are respectively arranged on the oil tank 11. The circulating flow module 2 includes a first circulation loop 21 and a circulation oil pump 22. The liquid inlet end of the first circulation loop 21 is connected to the bottom of the oil tank 11, and the liquid outlet end of the first circulation loop 21 is connected to the top of the oil tank 11. The circulation oil pump 22 is arranged on the first circulation loop 21. The working condition simulation module 3 includes a second circulation loop 31, a pump assembly 32 and a throttling assembly 33. The liquid inlet end of the second circulation loop 31 is connected to the bottom of the oil tank 11, and the liquid outlet end of the second circulation loop 31 is connected to the top of the oil tank 11. Both the pump assembly 32 and the throttling assembly 33 are arranged on the second circulation loop 31 and are used to simulate the working pressure and flow velocity of the steam turbine governing system, and the pressure output by the circulation oil pump 22 is lower than the pressure output by the pump assembly 32. The control and detection module includes an electrical control unit 4, an on-line monitoring unit 5 and a sampling unit 6. The electrical control unit 4 is respectively electrically connected to the heating unit 13, the circulation oil pump 22, the pump assembly 32 and the throttling assembly 33, and the electrical control unit 4 conducts data interaction with a remote server. The on-line monitoring unit 5 is connected to the oil tank 11 and is used to on-line obtain key performance indicators during the aging process of the fire-resistant oil to be measured in the oil tank 11. The sampling unit 6 is connected to the oil tank 11 and is used to sample and analyze the fire-resistant oil to be measured in the oil tank 11 during the aging process at different stages.

[0022] Through the implementation of the above embodiments of the dynamic determination system for the performance of phosphate ester fire-resistant oil, by using the fire-resistant oil injection port and the atmospheric connection port on the oil tank 11, a quantitative amount of the fire-resistant oil to be tested can be injected into the oil tank 11, and air can be introduced to enable the fire-resistant oil to be tested to come into contact with oxygen and undergo an aging reaction, so as to promote the aging process of the fire-resistant oil to be tested. And through the setting of the catalytic unit 12 in the oil tank 11, the catalytic unit 12 is preferably a catalyst that promotes the reaction between the fire-resistant oil to be tested and oxygen, such as copper. Among them, the dosage of the active ingredient of the catalyst is 0.02% - 0.05% of the mass of the fire-resistant oil to be injected, and it can be reused after cleaning and activation, saving costs, so as to accelerate the aging reaction rate between the fire-resistant oil and oxygen in the oil tank 11. And the oil temperature of the fire-resistant oil to be tested is controlled by the heating unit 13, and the operating temperature of the oil product is controlled at 60 - 90 °C, which can further promote the reaction rate, so as to shorten the aging time of the fire-resistant oil to be tested in the oil tank 11, thereby shortening the test time and saving costs. Preferably, the catalytic unit 12 needs to be well protected to prevent oxidation failure, and the interval between putting the catalytic unit 12 into the oil tank 11 and injecting the fire-resistant oil to be tested into the oil tank 11 shall not exceed sixty minutes.

[0023] The circulating oil pump 22 is a low-pressure pump, which generates a relatively low pressure and provides a relatively high rotational speed for transporting a large amount of oil. The circulating oil pump 22 provides power for the fire-resistant oil to be tested in the oil tank 11, so that the fire-resistant oil to be tested in the oil tank 11 can flow fully along the first circulation loop 21. The oil pump assembly 32 is composed of a high-pressure pump, which generates a relatively high pressure and provides a relatively low rotational speed for transporting a quantitative amount of oil. Therefore, by controlling the oil pump assembly 32 and the throttle assembly 33 in the working condition simulation module 3 to simulate the working pressure and flow velocity of the steam turbine governing system, different rated working pressures can be set according to the test requirements to simulate the working conditions of different fire-resistant oil systems. When the fire-resistant oil to be tested in the oil tank 11 flows along the second circulation loop 31, it can truly and accurately reflect the performance change process of the fire-resistant oil under actual working conditions. Therefore, by using the online monitoring unit 5 and the sampling unit 6, the change data of various indicators during the aging process of the fire-resistant oil in the oil tank 11 can be obtained through two methods: online monitoring and sampling analysis at different stages, which can provide full tracking of the aging process of the fire-resistant oil, so as to comprehensively understand the aging process of the phosphate ester fire-resistant oil, and comprehensively obtain the change of indicators during the aging process of the phosphate ester fire-resistant oil under simulated on-site working conditions, thereby accurately evaluating the performance of the fire-resistant oil to guide the research and development of the fire-resistant oil and the improvement direction of the production process. Preferably, in addition to controlling the operation of each component, the electrical control unit 4 can also collect the data of each component in real time, compare it with the set value and adjust it to ensure that the entire determination process is carried out under the set conditions, and automatically stop when necessary to ensure safety.

[0024] Furthermore, the working condition simulation module 3 further includes a servo working unit, and the servo working unit includes a three-way valve 34 and a servo valve 35. The liquid outlet end of the oil pump assembly 32 is connected to the liquid inlet end of the three-way valve 34. One liquid outlet end of the three-way valve 34 is connected to the liquid inlet end of the throttling assembly 33 through a servo main path 36, and the other liquid outlet end of the three-way valve 34 is connected to the liquid inlet end of the throttling assembly 33 through a servo bypass 37. The servo valve 35 is arranged on the servo main path 36.

[0025] Through the implementation of the above embodiments of the dynamic determination system for the performance of phosphate ester fire-resistant oil, the servo valve 35 is arranged. By using the servo valve 35 as a core precision component in the steam turbine governing system, when the fire-resistant oil to be tested in the second circulation loop 31 passes through the servo valve 35, the influence of the oil quality of the fire-resistant oil to be tested on the working state of the servo valve 35 can be observed. That is, during the whole determination process, the servo valve 35 can be periodically or continuously tested for its operation, so as to observe the influence of the increase in acid value, the decrease in resistivity, the sludge deposition, etc. caused by the aging of the fire-resistant oil to be tested on the operation of the servo valve 35, so as to further evaluate the stability and reliability of the operation of the servo valve 35 affected by the aging of the fire-resistant oil. In addition, after the determination is completed, the servo valve 35 can be disassembled to check the internal corrosion and sludge deposition conditions of the servo valve 35. When the servo valve 35 is not being tested, the three-way valve 34 can be controlled to switch to the servo bypass 37 to continue the performance determination of the fire-resistant oil to be tested.

[0026] Furthermore, the oil pump assembly 32 includes a variable-frequency motor and a constant-pressure variable plunger pump. The constant-pressure variable plunger pump is arranged on the second circulation loop 31, and the output end of the variable-frequency motor is mechanically connected to the constant-pressure variable plunger pump. The working condition simulation module 3 further includes a first vacuum gauge 38 and a first pressure sensor 39. The first vacuum gauge 38 is arranged inside the liquid inlet end of the second circulation loop 31, and the first pressure sensor 39 is located on the liquid outlet side of the constant-pressure variable plunger pump and arranged on the second circulation loop 31. The first vacuum gauge 38, the first pressure sensor 39, the variable-frequency motor, and the constant-pressure variable plunger pump are respectively electrically connected to the electrical control unit 4.

[0027] Through the implementation of the above embodiments of the dynamic determination system for the performance of phosphate ester fire-resistant oil, in the oil pump assembly 32, a constant-pressure variable plunger pump is selected, which can reduce the system pressure shock during the action test of the servo valve 35 and is beneficial to the stable operation of the equipment. By using a variable-frequency motor to drive the constant-pressure variable plunger pump, different rated working pressures can be set according to the test requirements to simulate the working conditions of different fire-resistant oil systems. Preferably, the pressure adjustable range of the constant-pressure variable plunger pump is 0 Mpa to 25 Mpa. The setting of the first vacuum gauge 38 allows setting a specific vacuum value according to the test requirements and can obtain the vacuum value inside the liquid inlet end of the second circulation loop 31 and transmit it to the electrical control unit 4. This set value is usually used to define the normal operating conditions of the constant-pressure variable plunger pump, and when the vacuum value inside the second circulation loop 31 is lower than the set value, the corresponding protection or alarm mechanism can be triggered. Thus, a certain degree of vacuum is maintained in the second circulation loop 31 as a protection parameter for the operation of the constant-pressure variable plunger pump to promote the flow of the fire-resistant oil to be tested in the second circulation loop 31. The setting of the first pressure sensor 39 is used to monitor the pressure of the oil discharged from the outlet of the constant-pressure variable plunger pump and transmit the data to the electrical control unit 4 to facilitate adjusting the constant-pressure variable plunger pump to keep the inside of the second circulation loop 31 operating at the rated working pressure.

[0028] Furthermore, the throttling assembly 33 includes a throttle valve 331 and a flow sensor 332. The throttle valve 331 is arranged on the liquid outlet side of the constant-pressure variable plunger pump and is set on the second circulation loop 31. The flow sensor 332 is electrically connected to the electrical control unit 4.

[0029] Through the implementation of the above embodiments of the dynamic determination system for the performance of phosphate ester fire-resistant oil, by using the setting of the throttle valve 331, the flow rate passing through the second circulation loop 31 can be controlled to a preset flow rate by configuring the opening degree of the throttle valve 331 to simulate the flow rate of the steam turbine governing system. At the same time, the flow rate of the oil discharged from the outlet of the throttle valve 331 is monitored by using the flow sensor 332 and the data is transmitted to the electrical control unit 4 to facilitate adjusting the throttle valve 331 to keep the inside of the second circulation loop 31 operating at the preset flow rate.

[0030] Furthermore, the circulating flow module 2 further includes a second vacuum gauge 23 and a second pressure sensor 24. The second vacuum gauge 23 is arranged inside the liquid inlet end of the first circulation loop 21. The second pressure sensor 24 is located on the liquid outlet side of the circulating oil pump 22 and is set on the first circulation loop 21. The second vacuum gauge 23, the second pressure sensor 24, and the circulating oil pump 22 are respectively electrically connected to the electrical control unit 4.

[0031] Through the implementation of the above-described embodiment of the dynamic determination system for the performance of phosphate ester fire-resistant oil, the setting of the second vacuum gauge 23 allows for setting a specific vacuum value according to test requirements and can obtain the vacuum value inside the liquid inlet end of the first circulation loop 21 and transmit it to the electrical control unit 4. This set value is usually used to define the normal operating conditions of the circulation oil pump 22, and when the vacuum value inside the first circulation loop 21 is lower than the set value, it can trigger corresponding protection or alarm mechanisms. Thus, a certain degree of vacuum is maintained in the first circulation loop 21 as a protection parameter for the operation of the circulation oil pump 22 to promote the flow of the fire-resistant oil to be tested in the first circulation loop 21. The setting of the second pressure sensor 24 is used to monitor the pressure of the oil discharged from the outlet of the circulation oil pump 22 and transmit the data to the electrical control unit 4 to facilitate the adjustment of the circulation oil pump 22 to keep the inside of the first circulation loop 21 operating at a low pressure.

[0032] Further, the circulation flow module 2 further includes a filter 25 and a radiator 26. The filter 25 is disposed on the liquid outlet side of the circulation oil pump 22 and is arranged on the first circulation loop 21. The radiator 26 is disposed on the liquid outlet side of the filter 25 and is arranged on the first circulation loop 21. The radiator 26 is electrically connected to the electrical control unit 4.

[0033] Through the implementation of the above-described embodiment of the dynamic determination system for the performance of phosphate ester fire-resistant oil, by means of the setting of the filter 25, the filter 25 is preferably a high-precision and large-flow precision filtering instrument, which is used to ensure the cleanliness of the fire-resistant oil to be tested in the first circulation loop 21, so that it meets the index requirements of the operating fire-resistant oil and prevents the circulation oil pump 22 from being worn. By means of the radiator 26 being arranged immediately after the filter 25, when the oil temperature of the fire-resistant oil to be tested in the first circulation loop 21 exceeds the test set value, the fire-resistant oil to be tested can be cooled in a timely manner to reduce the heating rate of the fire-resistant oil to be tested.

[0034] Further, the fire-resistant oil oxidation module 1 further includes a liquid level sensor 14 and a breather 15. The liquid level sensor 14 is arranged on the fuel tank 11. The breather 15 is arranged at the air communication port, and a discoloring silica gel core is arranged inside the breather 15. The liquid level sensor 14 is electrically connected to the electrical control unit 4.

[0035] Through the implementation of the above-described embodiment of the dynamic determination system for the performance of phosphate ester fire-resistant oil, by means of the setting of the liquid level sensor 14, the liquid level of the fire-resistant oil to be tested in the fuel tank 11 can be collected and displayed in real time, so as to accurately control the injection amount of the fire-resistant oil to be tested in the fuel tank 11, which helps to evaluate the subsequent determination of the performance of the fire-resistant oil to be tested. By means of the breather 15 with a built-in discoloring silica gel core arranged at the air communication port, while ensuring the air communication between the fuel tank 11 and the atmosphere, the moisture in the air can be effectively removed to avoid affecting the aging reaction and performance determination of the fire-resistant oil to be tested in the fuel tank 11.

[0036] Furthermore, a partition 16 is provided inside the fuel tank 11, and the internal space of the fuel tank 11 is separated into an oil outlet chamber and an oil return chamber by the partition 16. The oil outlet chamber and the oil return chamber are connected through the gap at the top of the partition 16 and the openings provided on the bottom plate. The liquid inlet end of the first circulation loop 21 is connected to the bottom of the oil outlet chamber, and the liquid outlet end of the first circulation loop 21 is connected to the top of the oil outlet chamber. The heating unit 13 includes a temperature sensor 131 and a heater 132 provided in the oil outlet chamber. The liquid inlet end of the second circulation loop 31 is connected to the bottom of the oil outlet chamber, and the liquid outlet end of the second circulation loop 31 is connected to the top of the oil return chamber. The catalytic unit 12 is provided in the oil return chamber.

[0037] Through the implementation of the above embodiments of the dynamic determination system for the performance of phosphate ester fire-resistant oil, the fuel tank 11 is preferably made of stainless steel. The internal space of the fuel tank 11 is separated into an oil outlet chamber and an oil return chamber by the partition 16, so that the fire-resistant oil to be tested in the fuel tank 11 flows into the first circulation loop 21 and the second circulation loop 31 respectively in the oil outlet chamber, so as to realize low-pressure circulation and high-pressure circulation of the oil outlet. Since the fire-resistant oil to be tested in the first circulation loop 21 only needs to keep flowing, it circulates back to the oil outlet chamber. And the fire-resistant oil to be tested in the second circulation loop 31 is used for aging detection, so it returns to the oil return chamber. At this time, the fire-resistant oil to be tested that returns to the oil return chamber promotes the aging rate of the fire-resistant oil to be tested in the oil return chamber by the catalytic unit 12, so that the entrained bubbles, impact bubbles, etc. doped in it can be fully released in the oil return chamber, and then flow into the oil outlet chamber through the gap at the top of the partition 16 and the openings provided on the bottom plate, so as to repeat low-pressure circulation and high-pressure circulation, which can effectively improve the stability of the oil supply in the oil outlet chamber. Preferably, the temperature sensor 131 is a thermocouple or a thermal resistance sensor, which is used to collect the oil temperature of the fire-resistant oil in the fuel tank 11 and transmit it to the electrical control unit 4. The heater 132 is an electric heater or an infrared heater, which is used to heat the phosphate ester fire-resistant oil in the fuel tank 11 in a low-temperature state to improve the fluidity to facilitate the normal operation of the circulation oil pump 22 and the constant-pressure variable plunger pump.

[0038] Furthermore, the on-line monitoring unit 5 includes a monitoring loop 51, a metering pump 52 and an on-line monitor 53. The liquid inlet end of the monitoring loop 51 is connected to the bottom of the oil return chamber, and the liquid outlet end of the monitoring loop 51 is connected to the top of the oil return chamber. The metering pump 52 is provided on the monitoring loop 51, and the on-line monitor 53 is located on the liquid outlet side of the metering pump 52 and is connected to the monitoring loop 51, so that the on-line monitor 53 can perform on-line detection on the performance indexes of the oil passing through according to the preset standards. The sampling unit 6 includes a sampling pipeline 61 and a sampling valve 62. The liquid inlet end of the sampling pipeline 61 is connected to the bottom of the oil return chamber, and the sampling valve 62 is provided on the sampling pipeline 61.

[0039] Through the implementation of the above-mentioned embodiment of the dynamic determination system for the performance of phosphate ester fire-resistant oil, two detection methods, namely the on-line monitoring unit 5 and the sampling unit 6, are used in cooperation. When the fire-resistant oil to be tested in the fuel tank 11 undergoes high-pressure circulation along the second circulation loop 31, the metering pump 52 is turned on to accurately control the quantitative circulation of the fire-resistant oil to be tested in the fuel tank 11 along the monitoring loop 51 according to the preset flow rate, and the on-line monitor 53 is used to detect in real time the change data of various indicators during the aging process of the fire-resistant oil. Among them, the on-line monitor 53 is preferably a multi-functional oil quality detection device, which can provide on-line real-time monitoring of the oil quality and send the monitoring data to the electrical control unit 4 for recording and analysis. It is mainly used for on-line detection of three key performance indicators, such as particle size, acid value, moisture, resistivity, etc., and takes them as reference values to track the entire aging process of the fire-resistant oil. When the data of a certain key performance indicator changes, the sampling valve 62 can be opened when the fire-resistant oil to be tested in the fuel tank 11 is in different aging stages to take samples regularly, and the sampled samples are sent for inspection to further analyze the comprehensive performance indicators of the fire-resistant oil to be tested. Preferably, it can include the full analysis indicators specified in DL / T 571-2024 "Operation and Maintenance Guide for Phosphate Ester Fire-Resistant Oil Used in Power Plants", such as particle size, acid value, moisture, resistivity, flash point, auto-ignition point, density, kinematic viscosity, foam characteristics, and air release value, etc., to more comprehensively analyze the performance changes during the aging process of the phosphate ester fire-resistant oil. The setting of the on-line monitoring unit 5 can monitor the change of the oil quality throughout the process, effectively avoiding the missing of test data caused by untimely sampling or sudden change of the oil quality.

[0040] The present invention also provides a determination method, which adopts the above-mentioned dynamic determination system for the performance of phosphate ester fire-resistant oil. The determination method includes: Inject the fire-resistant oil to be tested into the fuel tank, turn on the first circulation loop 21, and after the fire-resistant oil to be tested flows fully, start the heating unit 13 to raise the temperature of the fire-resistant oil to be tested; When the temperature of the fire-resistant oil to be tested rises to the allowable operating temperature of the oil pump assembly 32, turn off the heating unit 13 and turn on the second circulation loop 31, and continue to raise the temperature of the fire-resistant oil to be tested by the work of the oil pump assembly 32; When the oil temperature of the fire-resistant oil to be tested rises to the preset temperature, adjust the power of the oil pump assembly 32 and the opening of the throttle assembly 33 to simulate the working pressure and flow velocity of the steam turbine governing system; While the fire-resistant oil to be tested returns to the fuel tank 11 along the second circulation loop 31 and continues to oxidize, obtain the key performance indicator data of the fire-resistant oil to be tested in the fuel tank 11 through the on-line monitoring unit 5, and regularly take samples of the fire-resistant oil to be tested in the fuel tank 11 through the sampling unit 6, and measure the full performance indicators of the sampled fire-resistant oil.

[0041] By implementing the embodiments of the above measurement method, before injecting the fuel oil to be tested, phosphate ester fuel oil for flushing is first injected into the fuel tank 11. The first circulation loop 21 and the second circulation loop 31 are respectively opened for flushing, and the flushing fuel oil is discharged after flushing. The phosphate ester fuel oil for flushing is the same as the fuel oil to be tested, and the amount of the phosphate ester fuel oil for flushing is not less than 25% of the amount of the fuel oil to be tested. After the flushing is completed, the flushing oil is tested, and all indicators need to be basically the same as those of the fuel oil to be tested. The injection amount of the fuel oil to be tested is preferably 350 ± 10 L, not exceeding 70% of the effective volume of the fuel tank 11. The temperature for starting the heating unit 13 to increase the temperature is preferably not lower than 30°C. The output power of starting the oil pump assembly 32 to heat the fuel oil to be tested is preferably set at 50%, and the opening degree of the throttle valve 331 is adjusted to 75% at this time. The allowable operating temperature of the oil pump assembly 32 is preferably not lower than 30°C, and the working set temperature to which the fuel oil to be tested is increased by the work of the oil pump assembly 32 is preferably 60 - 90°C. The working pressure set value of simulating the steam turbine governing system is preferably 11.2 Mpa or 14.5 Mpa, and the flow rate set value of simulating the steam turbine governing system is preferably 25 ± 0.5 L / min.

[0042] Specifically, by using the above dynamic measurement system and measurement method for the performance of phosphate ester fuel oil, combined with the changes of two typical indicators, acid value and resistivity, during the test process of domestic fuel oil (fuel oil A) and imported fuel oil (fuel oil B), a comprehensive tracking test is taken as an example to illustrate: Set the injection amount of the fuel oil to be 350 L, the output power of the high-pressure oil pump assembly to be set at 65%, the amount of copper catalyst to be 0.02% of the mass of the fuel oil to be tested, the working set temperature to be 80°C, the working pressure set value to be set at 14.5 Mpa, and the flow rate to be set at 25 L / min. According to the above conditions, tests are respectively carried out on fuel oil A and fuel oil B.

[0043] During the test, the changes of two typical indicators, acid value and resistivity, are as Figure 2 and Figure 3 shown. As can be seen from Figure 2 , at the beginning of the test, the acid value of fuel oil A is 0.017 mgKOH / g, and at the 40th day of operation, the acid value is 0.084 mgKOH / g, and the increase in acid value is 0.067 mgKOH / g. At the beginning of the test, the acid value of fuel oil B is 0.040 mgKOH / g, and at the 40th day of operation, the acid value is 0.145 mgKOH / g, and the increase in acid value is 0.105 mgKOH / g. The acid value increase rate of fuel oil B is significantly higher than that of fuel oil A, indicating that its aging speed is faster than that of fuel oil A.

[0044] As can be seen from Figure 3 , the resistivity of fuel oil A is 9.2×10 10, on the 40th day of operation, the acid value is and the resistivity is 1.3×10 10 . At the beginning of the test, the resistivity of the fire-resistant oil B was 5.6×10 10 , and on the 40th day of operation, the resistivity was 8×10 9 , which is lower than that of the fire-resistant oil A.

[0045] As described above, the full analysis results of the fire-resistant oil A and the fire-resistant oil B at the beginning and end of the performance evaluation test are shown in Table 1 and Table 2.

[0046] Table 1 Full analysis results of the fire-resistant oil A at the beginning and end of the performance evaluation test A dynamic determination system and method for the performance of a phosphate fire-resistant oil

[0047] Table 2 Full analysis results of the fire-resistant oil B at the beginning and end of the performance evaluation test

[0048] From Table 1, among the oil quality indicators of the fire-resistant oil A before and after the performance evaluation, except for the acid value and resistivity that are more sensitive to the aging process, the other indicators have not shown obvious deterioration. From Table 2, among the oil quality indicators of the fire-resistant oil B before and after the performance evaluation, in addition to the obvious deterioration of the acid value and resistivity, other key indicators such as the foam characteristics and air release value have also shown obvious deterioration.

[0049] Combined with Figure 2 and Figure 3 the changing trends of the acid value and resistivity, and the full analysis results in Table 1 and Table 2, it can be obtained that the performance dynamic evaluation test of the fire-resistant oil A is better than that of the fire-resistant oil B, and its anti-aging performance is better than that of the fire-resistant oil B.

[0050] 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. For those skilled in the art, the technical solutions recorded in the above embodiments can be modified, or some of the technical features can be equivalently replaced; and all such modifications and replacements should fall within the protection scope of the present invention.

Claims

1. A dynamic determination system for the performance of phosphate ester fire-resistant oil, characterized in that, The dynamic measurement system for the performance of phosphate ester fire-resistant oil includes: The fire-resistant oil oxidation module, including an oil tank and a catalytic unit and a heating unit arranged in the oil tank, wherein an injection port for fire-resistant oil and an air communication port are respectively arranged on the oil tank; The circulating flow module, including a first circulation loop and a circulation oil pump, the liquid inlet end of the first circulation loop is connected to the bottom of the oil tank, and the liquid outlet end of the first circulation loop is connected to the top of the oil tank, and the circulation oil pump is arranged on the first circulation loop; The working condition simulation module, including a second circulation loop, an oil pump assembly and a throttling assembly, the liquid inlet end of the second circulation loop is connected to the bottom of the oil tank, and the liquid outlet end of the second circulation loop is connected to the top of the oil tank, and the oil pump assembly and the throttling assembly are both arranged on the second circulation loop, used to simulate the working pressure and flow velocity of the steam turbine governing system, and the pressure output by the circulation oil pump is lower than the pressure output by the oil pump assembly; The control and detection module, including an electrical control unit, an on-line monitoring unit and a sampling unit, the electrical control unit is respectively electrically connected to the heating unit, the circulation oil pump, the oil pump assembly and the throttling assembly, and the electrical control unit conducts data interaction with a remote server, the on-line monitoring unit is connected to the oil tank, used to on-line obtain the performance indexes during the aging process of the fire-resistant oil to be measured in the oil tank, and the sampling unit is connected to the oil tank, used to sample and analyze the fire-resistant oil to be measured in the oil tank during the aging process at different stages.

2. The dynamic determination system for the performance of phosphate ester fire-resistant oil according to claim 1, wherein: The working condition simulation module further includes a servo working unit, and the servo working unit includes a three-way valve and a servo valve; The liquid outlet end of the oil pump assembly is connected to the liquid inlet end of the three-way valve, one liquid outlet end of the three-way valve is connected to the liquid inlet end of the throttling assembly through a servo main path, and the other liquid outlet end of the three-way valve is connected to the liquid inlet end of the throttling assembly through a servo bypass, and the servo valve is arranged on the servo main path.

3. The dynamic determination system for the performance of phosphate ester fire-resistant oil according to claim 1, wherein: The oil pump assembly includes a variable-frequency motor and a constant-pressure variable plunger pump, the constant-pressure variable plunger pump is arranged on the second circulation loop, and the output end of the variable-frequency motor is mechanically connected to the constant-pressure variable plunger pump; The working condition simulation module further includes a first vacuum gauge and a first pressure sensor, the first vacuum gauge is arranged in the liquid inlet end of the second circulation loop, the first pressure sensor is arranged on the second circulation loop on the liquid outlet side of the constant-pressure variable plunger pump, and the first vacuum gauge, the first pressure sensor, the variable-frequency motor and the constant-pressure variable plunger pump are respectively electrically connected to the electrical control unit.

4. The dynamic determination system for the performance of phosphate ester fire-resistant oil according to claim 3, wherein: The throttling assembly includes a throttle valve and a flow sensor, the throttle valve is arranged on the second circulation loop on the liquid outlet side of the constant-pressure variable plunger pump, and the flow sensor is electrically connected to the electrical control unit.

5. The dynamic determination system for the performance of phosphate ester fire-resistant oil according to claim 1, wherein: The circulating flow module further includes a second vacuum gauge and a second pressure sensor. The second vacuum gauge is disposed inside the liquid inlet end of the first circulation loop, and the second pressure sensor is located on the liquid outlet side of the circulating oil pump and disposed on the first circulation loop. The second vacuum gauge, the second pressure sensor, and the circulating oil pump are respectively electrically connected to the electrical control unit.

6. The dynamic determination system for the performance of phosphate ester fire-resistant oil according to claim 1, wherein: The circulating flow module further includes a filter and a radiator. The filter is located on the liquid outlet side of the circulating oil pump and disposed on the first circulation loop. The radiator is located on the liquid outlet side of the filter and disposed on the first circulation loop. The radiator is electrically connected to the electrical control unit.

7. The dynamic determination system for the performance of phosphate ester fire-resistant oil according to claim 1, wherein: The fire-resistant oil oxidation module further includes a liquid level sensor and a breather. The liquid level sensor is disposed on the fuel tank, and the breather is disposed at the atmosphere communication port. A discoloring silica gel core is disposed inside the breather. The liquid level sensor is electrically connected to the electrical control unit.

8. The dynamic determination system for the performance of phosphate ester fire-resistant oil according to claim 1, wherein: A partition is disposed inside the fuel tank, and the internal space of the fuel tank is separated into an oil outlet chamber and an oil return chamber by the partition. The oil outlet chamber and the oil return chamber are communicated through the gap at the top of the partition and the openings provided on the bottom plate. The liquid inlet end of the first circulation loop is connected to the bottom of the oil outlet chamber, and the liquid outlet end of the first circulation loop is connected to the top of the oil outlet chamber. The heating unit includes a temperature sensor and a heater disposed inside the oil outlet chamber. The liquid inlet end of the second circulation loop is connected to the bottom of the oil outlet chamber, and the liquid outlet end of the second circulation loop is connected to the top of the oil return chamber. The catalytic unit is disposed inside the oil return chamber.

9. The dynamic determination system for the performance of phosphate ester fire-resistant oil according to claim 8, wherein: The on-line monitoring unit includes a monitoring loop, a metering pump, and an on-line monitor. The liquid inlet end of the monitoring loop is connected to the bottom of the oil return chamber, and the liquid outlet end of the monitoring loop is connected to the top of the oil return chamber. The metering pump is disposed on the monitoring loop, and the on-line monitor is located on the liquid outlet side of the metering pump and connected to the monitoring loop, so that the on-line monitor can on-line detect the performance indexes of the oil passing through according to the 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 return chamber, and the sampling valve is disposed on the sampling pipeline.

10. A determination method, which uses the dynamic determination system for the performance of phosphate ester fire-resistant oil described in any one of claims 1-9, is characterized in that, The determination method includes: Inject the fire-resistant oil to be tested into the fuel tank, start the first circulation loop, and after the fire-resistant oil to be tested flows sufficiently, start the heating unit to raise the temperature of the fire-resistant oil to be tested. When the temperature of the fire-resistant oil to be tested rises to the allowable operating temperature of the oil pump assembly, turn off the heating unit and start the second circulation loop, and continue to raise the temperature of the fire-resistant oil to be tested by the work of the oil pump assembly. When the oil temperature of the fire-resistant oil to be tested rises to the preset temperature, adjust the power of the oil pump assembly and the opening degree of the throttling assembly to simulate the working pressure and flow velocity of the steam turbine governing system. While the fuel to be tested continues to oxidize as it returns to the fuel tank along the second circulation loop, key performance index data of the fuel to be tested in the fuel tank is obtained through the on-line monitoring unit, and the fuel to be tested in the fuel tank is sampled regularly by the sampling unit to measure all performance indexes of the sampled fuel.

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