Fuel long storage environment multi-factor comprehensive simulation test method

Abstract

The invention relates to a fuel long storage environment multi-factor comprehensive simulation test method, and belongs to the technical field of simulation tests. In order to overcome the defect that in the prior art, environment multi-factor comprehensive simulation tests can not be loaded at the same time, the environment multi-factor comprehensive simulation test method comprises the following steps that 1, a test sample is loaded into a storage tank of a test device; step 2, applying various environmental factors to the test sample in the storage tank in the step 1; step 3, regularly detecting the test sample to which the environmental factors are applied in the step 2; and 4, analyzing the quality stability of the stored fuel in various storage environments according to a detection result in the step 3. The simulation test method can realize storage acceleration test or environment multi-factor comprehensive simulation, and is used for testing, measuring and monitoring the quality stability of the fuel stored in the storage tank under various storage environments.

Description

Technical Field

[0001] The invention relates to an environmental multi-factor comprehensive simulation test method for long-term storage of fuel, and belongs to the technical field of simulation tests. Background Art

[0002] The role of fuel on aircraft is mainly reflected in providing power and energy to support the normal operation of aircraft and complete missions. Fuel is generally stored in aircraft tanks for several years. In addition to the warehouse, the storage environment also includes the external natural environment, which has characteristics such as high and low temperature differences, a certain humidity, and pressure differences, which have a certain impact on the relevant quality indicators of the fuel. In order to ensure the quality of fuel during long-term storage, natural environment tests are usually used. The test results obtained are true and reliable, but the test time is generally measured in years, which takes a long time, and multiple tests need to be carried out in different environments. Existing tests for simulating long-term storage of fuel mainly include high and low temperature tests, and there is a lack of comprehensive simulation test technology that can load multiple environmental factors at the same time. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiency in the prior art of lacking the ability to simultaneously load environmental multi-factor comprehensive simulation tests, and to provide an environmental multi-factor comprehensive simulation test method for long-term fuel storage. The simulation test method can realize storage acceleration test or environmental multi-factor comprehensive simulation, and is used to test and measure the quality stability of fuel stored in storage tanks under various storage environments.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A multi-factor comprehensive simulation test method for long-term fuel storage environment, which is special in that it includes the following steps: Step 1: Place the test sample into the storage tank of the test device; Step 2, applying various environmental factors to the test sample in the storage tank in step 1; Step 3, regularly testing the test samples subjected to environmental factors in step 2; Step 4: Analyze the quality stability of the stored fuel under various storage environments according to the test results of step 3; Furthermore, the test sample in step 1 is jet fuel or other liquid fuels such as gasoline, kerosene, diesel, etc.; Furthermore, the multiple environmental factors described in step 2 include any two or a combination of three of air pressure, temperature, and humidity. Furthermore, the air pressure range in step 2 is 0MPa to 0.45MPa; the temperature range is -25°C to 120°C and is lower than the boiling point of the fuel; when the temperature is 25°C, the humidity range is 0 RH% to 100 RH%; Furthermore, in step 2, when the test temperature is higher than 100° C., two environmental factors, namely, air pressure and temperature, are applied simultaneously; Furthermore, the environmental factor value applied in step 2 changes cyclically, and each cycle is a test cycle; the length of the test cycle is generally measured in hours; the test cycle should be converted to the corresponding test cycle according to the storage time required to be simulated and the temperature acceleration test formula corresponding to the sample category; Furthermore, the temperature acceleration test formula is: T=x×t （x-20） / 10 ÷24÷365 Where: T—corresponds to the storage time at 20℃, in years; x—accelerated test temperature, in °C; t—accelerated time, in h; Furthermore, the regular testing in step 3 is to take the sample out of the storage tank for quality index analysis and testing after the determined test cycle is completed; Furthermore, the analysis and detection in step 3 is specifically as follows: stop loading system parameters such as temperature and humidity, turn off the system power supply when the storage tank is depressurized and restored to normal pressure, extract a certain amount of samples, immediately test the relevant quality indicators one by one according to the national standard method, and keep good test records; Furthermore, step 4 is specifically as follows: according to the test records of step 3, various indicators of technical quality requirements specified for the fuel, such as density, flash point, etc., are analyzed according to the respective national standard methods, and a judgment conclusion on whether it is qualified is given according to the quantity limit requirements, and finally a comprehensive analysis is made on the quality stability of the fuel.

[0005] The present invention provides an environmental multi-factor comprehensive simulation test method for long-term storage of fuel. First, according to the quality indicators that need to be monitored for long-term storage of different fuels and the actual storage environment, the environmental factors involved in the long-term storage of fuel are given, and an environmental multi-factor comprehensive simulation test method is designed to measure and monitor the quality stability of fuel stored in a storage tank under various storage environments. Compared with the natural environment storage test method, this test method can obtain test results more quickly and is particularly suitable for quality monitoring tests of long-term storage of fuel. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 is a flow chart of the present invention; Figure 2 This is a result analysis diagram of experiment (2) in Example 2. DETAILED DESCRIPTION

[0007] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0008] Example 1. A comprehensive simulation test method for long-term fuel storage environment with multiple factors, the specific process is as follows: Figure 1 As shown, the following steps are included: Step 1: Place the test sample into the storage tank of the test device; Step 2, applying various environmental factors to the test sample in the storage tank in step 1; Step 3, regularly testing the test samples subjected to environmental factors in step 2; Step 4: Analyze the quality stability of the stored fuel under various storage environments according to the test results of step 3; Wherein, the test sample in step 1 is jet fuel or other liquid fuels such as gasoline, kerosene, diesel, etc.; The multiple environmental factors in step 2 include any two or a combination of three of air pressure, temperature, and humidity. Wherein, the air pressure range in step 2 is 0MPa to 0.45MPa; the temperature range is -25°C to 120°C and is lower than the boiling point of the fuel; when the temperature is 25°C, the humidity range is 0 RH% to 100 RH%(); Wherein, in step 2, when the test temperature is higher than 100° C., two environmental factors, air pressure and temperature, are applied simultaneously; The environmental factor value applied in step 2 changes cyclically, and each cycle is a test cycle; the length of the test cycle is generally measured in hours; the test cycle should be converted to the corresponding test cycle according to the storage time required to be simulated and the temperature acceleration test formula corresponding to the sample category; The temperature acceleration test formula is: T = x × t （x-20） / 10 ÷24÷365 Where: T—corresponds to the storage time at 20℃, in years; x—accelerated test temperature, in °C; t—accelerated time, in h; Furthermore, the regular testing in step 3 is to take the sample out of the storage tank for quality index analysis and testing after the determined test cycle is completed; The analysis and testing in step 3 are as follows: stop loading system parameters such as temperature and humidity, turn off the system power supply when the tank is depressurized and restored to normal pressure, extract a certain amount of samples, and immediately test the relevant quality indicators one by one according to the national standard method, and keep good test records; Among them, the specific steps of step 4 are as follows: according to the test records of step 3, various indicators of technical quality requirements of the fuel, such as density, flash point, etc., are analyzed according to the respective national standard methods, and a judgment conclusion on whether it is qualified is given according to the quantity limit requirements, and finally a comprehensive analysis is made on the quality stability of the fuel.

[0009] Example 2. A jet fuel with a known anti-icing additive content is used as an example to illustrate the environmental multi-factor comprehensive simulation test of Example 1. The purpose of the test is to monitor the change of the anti-icing additive content during storage. The test includes test (1) and test (2).

[0010] The sample mainly refers to the fuel commonly used in aircraft, which is stored for about 10 years. Since the fuel is generally sealed in a tank of a certain volume in the aircraft, the changes in ambient temperature and humidity in the natural storage environment are mainly involved.

[0011] The main performance indicators of the environmental multi-factor comprehensive simulation test of fuel long-term storage are as follows: (1) The air pressure range is 0MPa~0.45MPa; (2) The temperature range is -25℃~120℃; (3) At 25°C, the humidity range is 0 RH% to 100 RH%; It is necessary to examine whether the content of anti-icing additives in jet fuel changes during storage. During the periodic measurement process, samples need to be taken regularly, tested and recorded.

[0012] Test (1): To simulate a 10-year storage period, the accelerated test cycle is designed to be 10, 20, 30, ... 180 hours in total according to the jet fuel temperature accelerated test formula as shown in formula (1); T=x×t （x-20） / 10 ÷24÷365, (1) Where: T—corresponding to storage time at 20°C (year); x—accelerated test temperature (℃); t—acceleration time (h).

[0013] Applying temperature as an environmental factor, as shown in Table 1, is one test cycle, and the total number of cycles is 18.

[0014] Table 1 24h cycle operation table , The natural storage (20°C) time corresponding to the accelerated test is shown in Table 2.

[0015] Table 2 Time table of accelerated test (110℃) corresponding to natural storage (20℃) , There is a total of 1 group of samples. The anti-icing additive content of the samples is measured and the original data is recorded; the samples are sucked into the storage tank of the test device.

[0016] Apply temperature environmental factors, the value of the applied temperature factor is 110℃, every 10 hours is one test cycle, and the test ends after 18 cycles in total.

[0017] Sampling is required during each test cycle to detect the content of anti-icing additives in the samples.

[0018] The steps are as follows: stop the system temperature loading, turn off the system power, and after the system cools down naturally, the tank pressure is relieved to normal pressure, and a certain amount of samples are extracted by a pump. After the sampling is completed, the conditions of each factor begin to be tested according to the conditions of the first cycle, and the total number of test cycles is accumulated; after a total of 18 test cycles are completed, the last group of samples are taken out and the machine is shut down; the anti-icing additive content of the taken samples is measured in time, the data is recorded and statistical analysis is performed.

[0019] Test results: The test time is taken as the horizontal axis and the anti-icing additive content is taken as the vertical axis. The trend of the results is subjected to regression analysis, as shown in formula (2): y = -0.5x + 0.1, (2) Where: y—anti-icing additive content (%); x—accelerated test time (h).

[0020] The test results show that the content of anti-icing additives in jet fuel in the accelerated storage test decreases slowly with the increase of storage time.

[0021] Test (2): To simulate the effect of temperature and humidity changes on the content of anti-icing additives in jet fuel under natural storage conditions, the test cycles were designed to be: cumulative 4 h, 8 h, 12 h, 16 h, 20 h, and 24 h.

[0022] The two environmental factors of temperature and humidity were applied simultaneously, as shown in Table 3, for one test cycle, and a total of 6 cycles were completed.

[0023] Table 3 4h cycle operation table , Sampling is required during each test cycle to detect the content of anti-icing additives in the samples.

[0024] The steps are as follows: stop system temperature loading, turn off humidity loading, release the pressure of the storage tank to normal pressure, turn off the system power, extract a certain amount of samples through the pump, and after the sampling is completed, each factor condition starts the test according to the conditions of the first cycle, and the total number of test cycles is accumulated. After the cumulative completion of 5 test cycles, take out the last set of samples and shut down.

[0025] Measure the anti-icing additive content of the samples taken out in time, record the data and conduct statistical analysis.

[0026] Test results: With the test time as the horizontal axis and the anti-icing additive as the vertical axis, the trend of the results was subjected to regression analysis. Figure 2 shown.

[0027] According to the test results Figure 2 It can be seen that during short-term storage, the content of anti-icing additives in the jet fuel sealed in the storage tank does not change basically with changes in ambient temperature and humidity.

[0028] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A comprehensive simulation test method for long-term fuel storage environment with multiple factors, characterized in that: The following steps are involved: Step 1: Place the test sample into the storage tank of the test device; Step 2, applying various environmental factors to the test sample in the storage tank in step 1; Step 3, regularly testing the test samples subjected to environmental factors in step 2; Step 4: Analyze the quality stability of the stored fuel under various storage environments based on the test results of step 3.

2. The method for comprehensive simulation test of environmental multi-factors for long-term fuel storage according to claim 1 is characterized in that: The test sample in step 1 is jet fuel or other liquid fuels such as gasoline, kerosene, diesel, etc.

3. The method for comprehensive simulation test of environmental multi-factors for long-term fuel storage according to claim 1 or 2, characterized in that: The multiple environmental factors described in step 2 include any two or a combination of three of air pressure, temperature, and humidity.

4. The method for comprehensive simulation test of environmental multi-factors for long-term fuel storage according to claim 3 is characterized in that: The air pressure range in step 2 is 0 MPa to 0.45 MPa; the temperature range is -25°C to 120°C and is lower than the boiling point of the fuel; when the temperature is 25°C, the humidity range is 0 RH% to 100 RH%.

5. The method for comprehensive simulation test of environmental multi-factors for long-term fuel storage according to claim 4 is characterized in that: In step 2, when the test temperature is higher than 100° C., two environmental factors, air pressure and temperature, are applied simultaneously.

6. The method for comprehensive simulation test of environmental multi-factors for long-term fuel storage according to claim 3 is characterized by: The environmental factor value applied in step 2 changes cyclically, and each cycle is a test cycle; the length of the test cycle is generally measured in hours; the test cycle should be converted into the corresponding test cycle according to the storage time required to be simulated and the temperature acceleration test formula corresponding to the sample category.

7. The method for comprehensive simulation test of environmental multi-factors for long-term fuel storage according to claim 6 is characterized by: The temperature acceleration test formula is: T = x × t （x-20） / 10 ÷24÷365, In the formula: T is the storage time at 20℃, in years; x is the temperature of the accelerated test, in ℃; t is the accelerated time, in hours.

8. The method for comprehensive simulation test of environmental multi-factors for long-term fuel storage according to claim 3 is characterized by: The regular inspection in step 3 is to take the samples out of the storage tank for analysis and inspection of quality indicators after the determined test cycle is completed.

9. The method for comprehensive simulation test of environmental multi-factors for long-term fuel storage according to claim 8 is characterized in that: The analysis and testing in step 3 are as follows: stop loading system parameters such as temperature and humidity, turn off the system power supply when the tank pressure is relieved and restored to normal pressure, draw a certain amount of samples, immediately test the relevant quality indicators one by one according to the national standard method, and keep good test records.

10. The method for comprehensive simulation test of environmental multi-factors for long-term fuel storage according to claim 9, characterized in that: The specific steps of step 4 are as follows: according to the test records of step 3, the various indicators of the technical quality requirements of the fuel are analyzed according to the respective national standard methods, and a judgment conclusion on whether the fuel is qualified is given according to the quantity limit requirements, and finally a comprehensive analysis of the quality stability of the fuel is made.

Images