Determination method for diesel oil burning resistance test

Abstract

The invention discloses a determination method for a diesel oil burning resistance test. The determination method comprises the following steps: a, performing composition analysis on diesel oil: a1, separating components of a diesel oil sample; a2, performing chromatographic analysis; and b, performing a diesel oil bench test on the rest diesel oil after the test analysis is completed, namely measuring the diesel oil fuel consumption per hundred kilometers under five working conditions. Diesel oil is subjected to composition analysis, after composition analysis is completed, the remaining diesel oil is analyzed through a diesel oil bench test, and a report about the influence of different compositions of the diesel oil on a diesel oil engine is obtained; therefore, the best composition proportion with the lowest diesel oil consumption is obtained, then the composition proportion required by the crude oil is deduced and used for guiding the blending work of the crude oil required in oil refining production, and the economic benefit and the diesel oil burning resistance are improved.

Description

Technical Field

[0001] The invention relates to the technical field of diesel burning resistance detection, and in particular to a method for testing diesel burning resistance. Background Art

[0002] In the field of diesel performance testing, the focus is on evaluating the effectiveness of diesel engine fuel-saving technologies, but not on the impact of the content of different molecular components of diesel (linear alkanes, cycloalkanes, total aromatics, polycyclic aromatic hydrocarbons, etc.) on diesel engines. In addition, existing measurement methods have the following deficiencies:

[0003] 1. Single operating condition simulation: Traditional bench tests mostly focus on a single operating condition (such as steady-state load), which makes it difficult to cover the complex operating conditions in actual driving (such as urban areas, inter-city areas, expressways, etc.), resulting in deviations between test results and actual usage scenarios.

[0004] 2. Insufficient data collection accuracy: Some test equipment relies on manual operation or simple sensors, and the real-time collection accuracy of parameters such as temperature, pressure, and fuel consumption is low, and there is a lack of multi-parameter collaborative analysis capabilities.

[0005] 3. Low degree of automation: Equipment parameters need to be adjusted frequently and manually during the test, which is inefficient. Human intervention can easily introduce errors and cannot meet the requirements of long-term reliable operation.

[0006] 4. Insufficient safety assurance: For high-power engine tests, there is a lack of a comprehensive multi-level alarm and emergency protection mechanism, which poses a risk of equipment damage and safety accidents.

[0007] As the country's diesel standards become increasingly stringent, although the country has issued standards for automotive diesel, the diesel raw materials produced on the market are uneven. Although the indicators of the produced diesel meet the national standards, the fuel consumption of diesel engines fluctuates. There is an urgent need for a diesel burning resistance measurement method that can accurately simulate actual working conditions, realize high-precision data collection and automatic control, to judge the performance of diesel and provide a scientific basis for the optimization of diesel composition. Summary of the Invention

[0008] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a method for measuring the burning resistance of diesel.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A method for measuring the burning resistance of diesel fuel comprises the following steps:

[0011] a. Analyze the composition of diesel:

[0012] a1. Separation of diesel sample components:

[0013] Saturated hydrocarbon washing liquid and aromatic hydrocarbon washing liquid are separated from diesel sample by solid phase extraction, and saturated hydrocarbon sample solution and aromatic hydrocarbon sample solution are prepared respectively;

[0014] a2. Chromatographic analysis:

[0015] An online workstation using gas chromatography and mass spectrometry was used to test the composition of saturated hydrocarbon and aromatic hydrocarbon sample solutions, archive the results, and select the spectrum on an offline workstation to view the content report of each diesel component and determine the composition structure of the diesel.

[0016] b. Diesel bench test:

[0017] b1. Test system construction

[0018] Select the test vehicle model and build a test bench platform, including subsystems such as the test bench measurement and control system, data acquisition system, environmental assurance system, and auxiliary equipment;

[0019] b2. Test preparation stage

[0020] Including equipment inspection and sensor calibration;

[0021] b3. Test operation stage

[0022] ① After the experimental preparation is completed, turn on the frequency conversion cabinet, frequency conversion controller, test preparation, circulating water pump, cooling fan, air intake and exhaust system, air intake air conditioner, refrigeration unit, fuel consumption meter, exhaust gas analyzer, and control computer in sequence;

[0023] ② Check the water inlet and outlet pressures of the engine intercooler temperature control device, engine coolant temperature control device, and engine oil temperature control device;

[0024] ③Add test diesel sample;

[0025] ④ Turn on the control computer, open the workstation, start the fuel consumption meter, and eliminate fuel bubbles to make the fuel consumption meter enter a stable state;

[0026] ⑤ Start the engine and conduct a test preheat. After idling for 15 minutes, gradually increase the speed to the target vehicle speed. After stabilizing for 3 minutes, start data collection. Maintain each torque test point for 2 minutes to ensure parameter stability.

[0027] ⑥ Switch the operating conditions in sequence according to urban, inter-city and rapid operation modes, and record the real-time data under each operating condition (sampling frequency ≥ 20Hz);

[0028] b4. The speed is calculated as follows:

[0029] n=i0×i k ×v / (0.377×r) formula (1)

[0030] In the above formula (1):

[0031] n is the engine speed in revolutions per minute (r / min);

[0032] i0 is the main transmission ratio;

[0033] i k The highest or second highest gear ratio of the transmission;

[0034] r is the wheel rolling radius, in meters (m);

[0035] v is the vehicle speed in kilometers per hour (km / h);

[0036] b5. Data processing and calculation

[0037] Fuel consumption per 100 kilometers is calculated as follows:

[0038] Q=G f / v*100 / ρ formula (2)

[0039] Q is the diesel fuel consumption per 100 kilometers, in liters per 100 kilometers (L / 100km);

[0040] G f The integrated mean of the engine's hourly fuel consumption, in kilograms per hour (kg / h);

[0041] v is the vehicle speed, in kilometers per hour (km / h);

[0042] ρ is the standard density of fuel, in kilograms per liter (kg / L);

[0043] Refer to formula (2) and calculate the fuel consumption per 100 kilometers in urban area, inter-city and expressway respectively.

[0044] b6. End of the experiment.

[0045] Preferably, a1 includes the following steps:

[0046] ① Add 0.5 mL of n-pentane to the solid phase extraction column;

[0047] ② After n-pentane is completely adsorbed by the stationary phase, use a 0.25mL syringe to draw about 0.1mL of diesel sample and drop it onto the sieve plate in the solid phase extraction column;

[0048] ③ Place a 25mL conical flask at the lower end of the sample outlet of the solid phase extraction column and rinse the stationary phase with 2mL of n-pentane and 0.5mL of a mixed solution of dichloromethane and ethanol with a volume ratio of 5:1 in sequence to elute the adsorbed saturated hydrocarbon fraction. The eluate of the saturated hydrocarbon fraction is collected in this 25mL conical flask;

[0049] ④ When the added 0.5 mL of the mixed solution of dichloromethane and ethanol (volume ratio: 5:1) has just completely entered the stationary phase, replace the flask with another 25 mL conical flask and rinse the stationary phase with 2 mL of the mixed solution of dichloromethane and ethanol (volume ratio: 5:1) to elute the adsorbed aromatic fraction. The aromatic fraction eluate is collected in this 25 mL conical flask.

[0050] ⑤ Use a pipette to accurately add 1.00 mL of internal standard solution to the 25 mL conical flasks containing the saturated hydrocarbon and aromatic hydrocarbon flushing solutions, respectively, and shake well to obtain the saturated hydrocarbon sample solution and aromatic hydrocarbon sample solution respectively;

[0051] ⑥ Transfer to ampoules and label them.

[0052] Preferably, a2 includes the following steps:

[0053] ① First, turn on the helium gas and adjust the partial pressure to 0.5MPa. Turn on the nitrogen gas and adjust the partial pressure to 0.5MPa.

[0054] ② Turn on the helium purifier switch (parallel to the filter), turn on the mass spectrometer switch, start vacuuming, press the inner door of the mass spectrometer with your hand for at least 1 minute, and then close the outer door of the instrument;

[0055] ③ Simultaneously turn on the gas chromatograph, turn on the workstation, call the method, and the instrument automatically heats up;

[0056] ④Put the sample bottles in the corresponding numbers, open the online workstation, edit the sequence, and enter the sequence number, method name, sample name, sample type, sample mass, and solvent mass;

[0057] ⑤ After the sequence run is completed, open the offline workstation, select the spectrum to view the content report of each component of diesel, and determine the composition structure of diesel.

[0058] Preferably, b1 includes the following steps:

[0059] The Shaanxi Heavy Duty Truck Delong New M3000 375 HP 6X4 tractor (SX4250MB4) equipped with a Weichai WP12.375 engine was used as the test vehicle. A bench test platform was constructed that included the following subsystems:

[0060] Test bench measurement and control system: It consists of a control computer, measurement and control software, throttle actuator, etc., and supports automatic control of speed and torque and mode switching (such as M / n and n / P control modes);

[0061] Data acquisition system: integrated temperature sensor (PT100, K-type thermocouple), pressure sensor (accuracy ±0.25% FS), atmospheric pressure and temperature and humidity measurement unit, real-time collection of engine speed, torque, fuel consumption, exhaust temperature and other parameters;

[0062] Environmental assurance system: including fuel temperature control (accuracy ±1°C), coolant temperature control (accuracy ±2°C), intake air conditioning (temperature 20-30°C ±0.5°C, humidity 30-60% ±3%) and exhaust back pressure adjustment device to accurately control test environment parameters;

[0063] Auxiliary equipment: fuel supply system, air intake and exhaust system, exhaust gas treatment system (including opacimeter and five-component exhaust gas analyzer) to ensure stable test conditions.

[0064] Preferably, b2 includes the following steps:

[0065] Equipment inspection: Confirm that the antifreeze, engine oil, and circulating water levels are normal, the air intake air conditioning filter is not blocked, and the switches of each circulation system are in the initial state;

[0066] Sensor calibration: The torque sensor is calibrated using standard weights, and the environmental measurement unit is calibrated using a temperature and humidity calibrator to ensure that the sensor accuracy meets the requirements.

[0067] Preferably, the fuel consumption per 100 kilometers in urban area of ​​B5 is calculated as follows:

[0068] Q urban area = Q1*0.33+Q2*0.51+Q3*0.16 (2-1)

[0069] Q1 is the diesel fuel consumption per 100 kilometers when v1 = 30 km, in liters per 100 kilometers (L / 100km);

[0070] Q2 is the diesel fuel consumption per 100 kilometers when v2 = 45 km, in liters per 100 kilometers (L / 100 km);

[0071] Q3 is the diesel fuel consumption per 100 kilometers when v3 = 60 km, in liters per 100 kilometers (L / 100km);

[0072] 0.33 is the weighting coefficient of Q1;

[0073] 0.51 is the weighting coefficient of Q2;

[0074] 0.16 is the weighting coefficient of Q3.

[0075] Preferably, the fuel consumption per 100 kilometers of inter-city running in B5 is calculated as follows:

[0076] Q between cities = Q1*0.04+Q2*0.33+Q3*0.41+Q4*0.18+Q5*0.04 (2-2)

[0077] Q1 is the diesel fuel consumption per 100 kilometers when v1 = 30 km, in liters per 100 kilometers (L / 100km);

[0078] Q2 is the diesel fuel consumption per 100 kilometers when v2 = 45 km, in liters per 100 kilometers (L / 100 km);

[0079] Q3 is the diesel fuel consumption per 100 kilometers when v3 = 60 km, in liters per 100 kilometers (L / 100km);

[0080] Q4 is the diesel fuel consumption per 100 kilometers when v4 = 75 km, in liters per 100 kilometers (L / 100 km);

[0081] Q5 is the diesel fuel consumption per 100 kilometers when v5 = 90 km, in liters per 100 kilometers (L / 100km);

[0082] 0.04 is the weighting coefficient of Q1;

[0083] 0.33 is the weighting coefficient of Q2;

[0084] 0.41 is the weighting coefficient of Q3;

[0085] 0.18 is the weighting coefficient of Q4;

[0086] 0.04 is the weighting coefficient of Q5.

[0087] Preferably, the fuel consumption per 100 kilometers of fast running in b5 is calculated as follows:

[0088] Q fast = Q5*1 formula (2-3)

[0089] Q5 is the diesel fuel consumption per 100 kilometers when v5 = 90 km, in liters per 100 kilometers (L / 100km);

[0090] 1 is the weighting coefficient of Q5.

[0091] Preferably, b6 includes the following steps:

[0092] ① Equipment shutdown: shut down the engine, refrigeration unit, measurement and control software in sequence, discharge residual fuel from the system, and clean the test bench;

[0093] ②Data archiving: Store the test data (including original curves and calculation results) in the database and automatically generate a PDF report.

[0094] Compared with the prior art, the present invention has the following beneficial effects:

[0095] 1. The present invention uses solid-phase extraction-chromatography technology to accurately separate the paraffin, cycloparaffin, and aromatic components in diesel, quantitatively analyze their proportions, and establish a component database. Combined with bench tests, fuel consumption is measured under simulated real-world operating conditions (urban / inter-city / express), achieving a quantitative correlation between diesel chemical composition and combustion performance, breaking through the limitations of traditional empirical reconciliation and realizing multi-dimensional correlation analysis.

[0096] 2. This invention uses an environmental control system (accuracy ±0.5°C) and multi-sensor real-time data collection (sampling frequency ≥20Hz) to ensure the data reliability of the bench test design, and has created an original working condition weighted fuel consumption algorithm (Equations 2-1 to 2-3), integrating urban / inter-city / express multi-mode energy consumption to better suit actual transportation scenarios. Automated data archiving (PDF report generation) improves results and traceability.

[0097] 3. The testing method of the present invention can clearly reveal the optimal composition ratio of low-fuel-consumption diesel. By reversing the crude oil blending ratio, it can directly and accurately guide refineries to optimize the raw material ratio, provide quantitative indicators for refineries, avoid energy waste caused by blind blending, improve diesel combustion resistance and reduce production costs.

[0098] 4. The present invention establishes a quantitative model of diesel component-fuel consumption and utilizes a closed-loop correlation study of component separation-chromatographic analysis-bench testing-data calculation to significantly improve detection efficiency and provide a basis for precise control of oil refining production. While ensuring the burning resistance of diesel, it significantly reduces energy consumption costs, combining technological advancement with industrial applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0099] Figure 1 This is a chromatogram of the aromatic hydrocarbon sample liquid of the diesel sample of Example 1 of the present invention;

[0100] Figure 2 This is a chromatogram of the saturated hydrocarbon sample liquid of the diesel sample of Example 1 of the present invention;

[0101] Figure 3 This is a chromatogram of the aromatic hydrocarbon sample liquid of the diesel sample of Example 2 of the present invention;

[0102] Figure 4 This is a chromatogram of the saturated hydrocarbon sample liquid of the diesel sample of Example 2 of the present invention;

[0103] Figure 5 This is a chromatogram of the aromatic hydrocarbon sample liquid of the diesel sample of Example 3 of the present invention;

[0104] Figure 6 This is a chromatogram of the saturated hydrocarbon sample liquid of the diesel sample of Example 3 of the present invention;

[0105] Figure 7 This is a chromatogram of the aromatic hydrocarbon sample liquid of the diesel sample of Example 4 of the present invention;

[0106] Figure 8 This is a chromatogram of the saturated hydrocarbon sample liquid of the diesel sample of Example 4 of the present invention;

[0107] Figure 9 This is a chromatogram of the aromatic hydrocarbon sample liquid of the diesel sample of Example 5 of the present invention;

[0108] Figure 10 This is a chromatographic analysis chart of the saturated hydrocarbon sample liquid of the diesel sample in Example 5 of the present invention. DETAILED DESCRIPTION

[0109] The technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the existing known technologies. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0110] 1. Determination method

[0111] A method for measuring the burning resistance of diesel fuel comprises the following steps:

[0112] a. Analyze the composition of diesel:

[0113] a1. Separation of diesel sample components:

[0114] ① Add 0.5 mL of n-pentane to the solid phase extraction column.

[0115] ② After n-pentane is completely adsorbed by the stationary phase, use a 0.25mL syringe to draw about 0.1mL of diesel sample and drop it onto the sieve plate in the solid phase extraction column.

[0116] ③ Place a 25mL conical flask at the lower end of the sample outlet of the solid phase extraction column, and rinse the stationary phase with 2mL of n-pentane and 0.5mL of a mixed solution of dichloromethane and ethanol with a volume ratio of 5:1 in sequence to elute the adsorbed saturated hydrocarbon fraction. The eluate of the saturated hydrocarbon fraction is collected in this 25mL conical flask.

[0117] ④ When the added 0.5 mL of the mixed solution of dichloromethane and ethanol in a volume ratio of 5:1 has just completely entered the stationary phase, replace it with another 25 mL conical flask and rinse the stationary phase with 2 mL of the mixed solution of dichloromethane and ethanol in a volume ratio of 5:1 to elute the adsorbed aromatic fraction. The aromatic component eluate is collected in this 25 mL conical flask.

[0118] ⑤ Use a pipette to accurately add 1.00 mL of internal standard solution to the 25 mL conical flasks containing the saturated hydrocarbon and aromatic hydrocarbon flushing solutions, shake well, and prepare the saturated hydrocarbon sample solution and aromatic hydrocarbon sample solution respectively.

[0119] ⑥ Transfer to ampoules and label them.

[0120] a2. Chromatographic analysis:

[0121] ① First, turn on the helium gas and adjust the partial pressure to 0.5 MPa. Then turn on the nitrogen gas and adjust the partial pressure to 0.5 MPa.

[0122] ② Turn on the helium purifier switch (parallel to the filter), turn on the mass spectrometer switch, start vacuuming, press the inner door of the mass spectrometer by hand for at least 1 minute, and then close the outer door of the instrument after it is sucked.

[0123] ③ Simultaneously, turn on the gas chromatograph and the workstation, call the method, and the instrument will automatically heat up.

[0124] ④ Place the sample bottles with corresponding numbers, open the online workstation, edit the sequence, and enter the serial number, method name, sample name, sample type, sample mass, and solvent mass.

[0125] ⑤ After the sequence run is completed, open the offline workstation, select the spectrum to view the content report of each component of diesel, and determine the composition structure of diesel.

[0126] b. Carry out diesel bench test on the remaining diesel after the test analysis:

[0127] b1. Test system construction

[0128] The Shaanxi Heavy Duty Truck Delong New M3000 375 HP 6X4 tractor (SX4250MB4) equipped with a Weichai WP12.375 engine was used as the test vehicle. A bench test platform was constructed that included the following subsystems:

[0129] Test bench measurement and control system: It consists of a control computer, measurement and control software, throttle actuator, etc., and supports automatic control of speed and torque and mode switching (such as M / n and n / P control modes).

[0130] Data acquisition system: Integrates temperature sensors (PT100, K-type thermocouple), pressure sensors (accuracy ±0.25% FS), atmospheric pressure and temperature and humidity measurement units to collect parameters such as engine speed, torque, fuel consumption, and exhaust temperature in real time.

[0131] Environmental assurance system: includes fuel temperature control (accuracy ±1°C), coolant temperature control (accuracy ±2°C), intake air conditioning (temperature 20-30°C ±0.5°C, humidity 30-60% ±3%) and exhaust back pressure adjustment device to accurately control test environment parameters.

[0132] Auxiliary equipment: fuel supply system, air intake and exhaust system, exhaust gas treatment system (including opacimeter and five-component exhaust gas analyzer) to ensure stable test conditions.

[0133] b2. Test preparation stage

[0134] Equipment inspection: Confirm that the antifreeze, engine oil, and circulating water levels are normal, the air intake air conditioning filter is not blocked, and the switches of each circulation system are in the initial state.

[0135] Sensor calibration: The torque sensor is calibrated using standard weights, and the environmental measurement unit is calibrated using a temperature and humidity calibrator to ensure that the sensor accuracy meets the requirements.

[0136] b3. Test operation stage

[0137] ① After the experimental preparation is completed, turn on the frequency conversion cabinet, frequency conversion controller, test preparation, circulating water pump, cooling fan, air intake and exhaust system, air intake air conditioner, refrigeration unit, fuel consumption meter, exhaust gas analyzer, and control computer in sequence.

[0138] ② Check the inlet and outlet pressures of the engine intercooler temperature control device, engine coolant temperature control device, and engine oil temperature control device.

[0139] ③Add test diesel sample.

[0140] ④ Turn on the control computer, open the workstation, start the fuel consumption meter, eliminate fuel bubbles and make the fuel consumption meter enter a stable state.

[0141] ⑤ Start the engine and preheat the test. After idling for 15 minutes, gradually increase the speed to the target vehicle speed. After stabilizing for 3 minutes, begin data collection. Maintain each torque test point for 2 minutes to ensure parameter stability.

[0142] ⑥ Switch the operating conditions in sequence according to urban, inter-city and rapid operation modes, and record the real-time data under each operating condition (sampling frequency ≥ 20Hz).

[0143] b4. The speed is calculated as follows:

[0144] n=i0×i k ×v / (0.377×r) formula (1)

[0145] In the above formula (1):

[0146] n is the engine speed in revolutions per minute (r / min);

[0147] i0 is the main transmission ratio;

[0148] i k The highest or second highest gear ratio of the transmission;

[0149] r is the wheel rolling radius, in meters (m);

[0150] v is the vehicle speed in kilometers per hour (km / h);

[0151] b5. Data processing and calculation

[0152] ① Fuel consumption per 100 kilometers is calculated as follows:

[0153] Q=G f / v*100 / ρ formula (2)

[0154] Q is the diesel fuel consumption per 100 kilometers, in liters per 100 kilometers (L / 100km);

[0155] G f is the integrated mean of the engine's hourly fuel consumption, in kilograms per hour (kg / h); v is the vehicle speed, in kilometers per hour (km / h);

[0156] ρ is the standard density of fuel, in kilograms per liter (kg / L);

[0157] ② The fuel consumption per 100 kilometers in urban areas is calculated as follows:

[0158] Q urban area = Q1*0.33+Q2*0.51+Q3*0.16 (2-1)

[0159] Q1 is the diesel fuel consumption per 100 kilometers when v1 = 30 km, in liters per 100 kilometers (L / 100km);

[0160] Q2 is the diesel fuel consumption per 100 kilometers when v2 = 45 km, in liters per 100 kilometers (L / 100 km);

[0161] Q3 is the diesel fuel consumption per 100 kilometers when v3 = 60 km, in liters per 100 kilometers (L / 100km);

[0162] 0.33 is the weighting coefficient of Q1;

[0163] 0.51 is the weighting coefficient of Q2;

[0164] 0.16 is the weighting coefficient of Q3;

[0165] ③ The fuel consumption per 100 kilometers of inter-city driving is calculated as follows:

[0166] Q between cities = Q1*0.04+Q2*0.33+Q3*0.41+Q4*0.18+Q5*0.04 (2-2)

[0167] Q1 is the diesel fuel consumption per 100 kilometers when v1 = 30 km, in liters per 100 kilometers (L / 100km);

[0168] Q2 is the diesel fuel consumption per 100 kilometers when v2 = 45 km, in liters per 100 kilometers (L / 100 km);

[0169] Q3 is the diesel fuel consumption per 100 kilometers when v3 = 60 km, in liters per 100 kilometers (L / 100km);

[0170] Q4 is the diesel fuel consumption per 100 kilometers when v4 = 75 km, in liters per 100 kilometers (L / 100 km);

[0171] Q5 is the diesel fuel consumption per 100 kilometers when v5 = 90 km, in liters per 100 kilometers (L / 100km);

[0172] 0.04 is the weighting coefficient of Q1;

[0173] 0.33 is the weighting coefficient of Q2;

[0174] 0.41 is the weighting coefficient of Q3;

[0175] 0.18 is the weighting coefficient of Q4;

[0176] 0.04 is the weighting coefficient of Q5;

[0177] ④ The fuel consumption per 100 kilometers of fast running is calculated as follows:

[0178] Q fast = Q5*1 formula (2-3)

[0179] Q5 is the diesel fuel consumption per 100 kilometers when v5 = 90 km, in liters per 100 kilometers (L / 100km);

[0180] 1 is the weighting coefficient of Q5;

[0181] b6. End of the trial

[0182] ① Equipment shutdown: shut down the engine, refrigeration unit, and measurement and control software in sequence, discharge residual fuel from the system, and clean the test bench.

[0183] ②Data archiving: Store the test data (including original curves and calculation results) in the database and automatically generate a PDF report.

[0184] 2. Sample Selection

[0185] According to a test method, five groups of samples were selected as Example 1, Example 2, Example 3, Example 4 and Example 5, and the spectra were obtained on the chromatographic analysis workstation. Figure 1-10 , Figure 1-10 The curves in the figure include dynamic mass spectrometry, dynamic gas chromatography and static component analysis graph from top to bottom;

[0186] The fuel consumption calculation is shown in Table 1 below:

[0187] Table 1. Composition and fuel consumption of diesel samples in various examples

[0188]

[0189] Through the above method, the optimal composition ratio of diesel for low fuel consumption can be comprehensively and accurately evaluated, and the required composition ratio of crude oil can be deduced to guide the crude oil blending work required in refining production, thereby improving economic benefits and diesel burning resistance.

[0190] The present invention provides a method for measuring diesel burn resistance. The technical solution comprises the following steps: a) analyzing the diesel composition; a1) separating the diesel sample components; a2) performing chromatographic analysis; b) subjecting the remaining diesel after the analysis to a diesel bench test, which measures diesel fuel consumption per 100 kilometers under five operating conditions. The present invention analyzes the diesel composition and then uses the diesel bench test to analyze the remaining diesel after the analysis, producing a report on the effects of different diesel compositions on the diesel engine. This method determines the optimal diesel composition ratio for lowest fuel consumption, which can then be inferred from the required crude oil composition ratio. This is used to guide crude oil blending in oil refining operations, improving economic efficiency and diesel burn resistance.

[0191] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for measuring the burning resistance of diesel fuel, characterized in that: The following steps are involved: a. Analyze the composition of diesel: a1. Separation of diesel sample components: Saturated hydrocarbon washing liquid and aromatic hydrocarbon washing liquid are separated from diesel sample by solid phase extraction, and saturated hydrocarbon sample solution and aromatic hydrocarbon sample solution are prepared respectively; a2. Chromatographic analysis: An online workstation using gas chromatography and mass spectrometry was used to test the composition of saturated hydrocarbon and aromatic hydrocarbon sample solutions, archive the results, and select the spectrum on an offline workstation to view the content report of each diesel component and determine the composition structure of the diesel. b. Diesel bench test: b1. Test system construction Select the test vehicle model and build a test bench platform, including the test bench measurement and control system, data acquisition system, environmental assurance system and auxiliary equipment; b2. Test preparation stage Including equipment inspection and sensor calibration; b3. Trial operation stage ① After the experimental preparation is completed, turn on the frequency conversion cabinet, frequency conversion controller, test preparation, circulating water pump, cooling fan, air intake and exhaust system, air intake air conditioner, refrigeration unit, fuel consumption meter, exhaust gas analyzer, and control computer in sequence; ② Check the water inlet and outlet pressures of the engine intercooler temperature control device, engine coolant temperature control device, and engine oil temperature control device; ③Add test diesel sample; ④ Turn on the control computer, open the workstation, start the fuel consumption meter, and eliminate fuel bubbles to make the fuel consumption meter enter a stable state; ⑤ Start the engine and conduct a test preheating. After idling for 15 minutes, gradually load the engine to the target speed. After stabilizing for 3 minutes, start data collection. Maintain each torque test point for 2 minutes to ensure parameter stability. ⑥Switch the operating conditions in sequence according to urban, inter-city and rapid operation modes, and record the real-time data under each operating condition; b4. The speed is calculated as follows: n=i0×i k ×v / (0.377×r) Formula (1) In the above formula (1): n is the engine speed in revolutions per minute; i0 is the main transmission ratio; i k The highest or second highest gear ratio of the transmission; r is the wheel rolling radius, in meters; v is the vehicle speed in kilometers per hour; b5. Data processing and calculation Fuel consumption per 100 kilometers is calculated as follows: Q=G f / v*100 / ρ Formula (2) Q is the diesel fuel consumption per 100 kilometers, in liters per 100 kilometers; G f The integrated mean value of the engine's hourly fuel consumption, in kilograms per hour; v is the vehicle speed, in kilometers per hour; ρ is the standard density of fuel, in kilograms per liter; Refer to formula (2) and calculate the fuel consumption per 100 kilometers in urban area, inter-city and expressway respectively. b6. End of the experiment.

2. The method for measuring the burning resistance of diesel according to claim 1, characterized in that: The a1 includes the following steps: ① Add 0.5 mL of n-pentane to the solid phase extraction column; ② After n-pentane is completely adsorbed by the stationary phase, use a 0.25mL syringe to draw about 0.1mL of diesel sample and drop it onto the sieve plate in the solid phase extraction column; ③ Place a 25mL conical flask at the lower end of the sample outlet of the solid phase extraction column and rinse the stationary phase with 2mL of n-pentane and 0.5mL of a mixed solution of dichloromethane and ethanol with a volume ratio of 5:1 in sequence to elute the adsorbed saturated hydrocarbon fraction. The eluate of the saturated hydrocarbon fraction is collected in this 25mL conical flask; ④ When the added 0.5 mL of the mixed solution of dichloromethane and ethanol (volume ratio: 5:1) has just completely entered the stationary phase, replace the flask with another 25 mL conical flask and rinse the stationary phase with 2 mL of the mixed solution of dichloromethane and ethanol (volume ratio: 5:1) to elute the adsorbed aromatic fraction. The aromatic fraction eluate is collected in this 25 mL conical flask. ⑤ Use a pipette to accurately add 1.00 mL of internal standard solution to the 25 mL conical flasks containing the saturated hydrocarbon and aromatic hydrocarbon flushing solutions, respectively, and shake well to obtain the saturated hydrocarbon sample solution and aromatic hydrocarbon sample solution respectively; ⑥ Transfer to ampoules and label them.

3. The method for measuring the burning resistance of diesel according to claim 1, characterized in that: The a2 step includes the following steps: ① First, turn on the helium gas and adjust it to a partial pressure of 0.5 MPa; turn on the nitrogen gas and adjust it to a partial pressure of 0.5 MPa; ② Turn on the helium purifier switch, turn on the mass spectrometer switch, start vacuuming, press the inner door of the mass spectrometer with your hand for at least 1 minute, and then close the outer door of the instrument; ③ Simultaneously turn on the gas chromatograph, turn on the workstation, call the method, and the instrument automatically heats up; ④Put the sample bottles in the corresponding numbers, open the online workstation, edit the sequence, and enter the serial number, method name, sample name, sample type, sample mass, and solvent mass; ⑤ After the sequence run is completed, open the offline workstation, select the spectrum to view the content report of each component of diesel, and determine the composition structure of diesel.

4. The method for measuring the burning resistance of diesel according to claim 1, characterized in that: The b1 includes the following steps: The Shaanxi Heavy Duty Truck Delong New M3000 375 HP 6X4 tractor equipped with a Weichai WP12.375 engine was used as the test vehicle, and a bench test platform was constructed that included the following subsystems: Test bench measurement and control system: It consists of a control computer, measurement and control software, and a throttle actuator, and supports automatic control of speed and torque and mode switching; Data acquisition system: Integrates temperature sensor, pressure sensor, atmospheric pressure and temperature and humidity measurement unit to collect engine speed, torque, fuel consumption and exhaust temperature parameters in real time; Environmental assurance system: including fuel temperature control, coolant temperature control, intake air conditioning and exhaust back pressure adjustment devices to accurately control test environment parameters; Auxiliary equipment: fuel supply system, air intake and exhaust system, exhaust gas treatment system to ensure stable test conditions.

5. The method for measuring the burning resistance of diesel according to claim 1, characterized in that: The b2 includes the following steps: Equipment inspection: Confirm that the antifreeze, engine oil, and circulating water levels are normal, the air intake air conditioning filter is not blocked, and the switches of each circulation system are in the initial state; Sensor calibration: The torque sensor is calibrated using standard weights, and the environmental measurement unit is calibrated using a temperature and humidity calibrator to ensure that the sensor accuracy meets the requirements.

6. The method for measuring the burning resistance of diesel according to claim 1, characterized in that: The fuel consumption per 100 kilometers in urban area of ​​B5 is calculated as follows: Q urban area = Q1*0.33+Q2*0.51+Q3*0.16 (2-1) Q1 is the diesel fuel consumption per 100 km when v1 = 30 km, in liters per 100 km; Q2 is the diesel fuel consumption per 100 kilometers when v2 = 45 km, in liters per 100 kilometers; Q3 is the diesel fuel consumption per 100 kilometers when v3 = 60 km, in liters per 100 kilometers; 0.33 is the weighting coefficient of Q1; 0.51 is the weighting coefficient of Q2; 0.16 is the weighting coefficient of Q3.

7. The method for measuring the burning resistance of diesel according to claim 1, characterized in that: The fuel consumption per 100 kilometers of the B5 city trip is calculated as follows: Q between cities = Q1*0.04+Q2*0.33+Q3*0.41+Q4*0.18+Q5*0.04 (2-2) Q1 is the diesel fuel consumption per 100 kilometers when v1 = 30 km, in liters per 100 kilometers; Q2 is the diesel fuel consumption per 100 kilometers when v2 = 45 km, in liters per 100 kilometers; Q3 is the diesel fuel consumption per 100 kilometers when v3 = 60 km, in liters per 100 kilometers; Q4 is the diesel fuel consumption per 100 km when v4 = 75 km, in liters per 100 km; Q5 is the diesel fuel consumption per 100 kilometers when v5 = 90 km, in liters per 100 kilometers; 0.04 is the weighting coefficient of Q1; 0.33 is the weighting coefficient of Q2; 0.41 is the weighting coefficient of Q3; 0.18 is the weighting coefficient of Q4; 0.04 is the weighting coefficient of Q5.

8. The method for measuring the burning resistance of diesel according to claim 1, characterized in that: The fuel consumption of 100 kilometers in the fast running of B5 is calculated as follows: Q fast = Q5*1 formula (2-3) Q5 is the diesel fuel consumption per 100 kilometers when v5 = 90 km, in liters per 100 kilometers; 1 is the weighting coefficient of Q5.

9. The method for measuring the burning resistance of diesel according to claim 1, characterized in that: The b6 comprises the following steps: ① Equipment shutdown: shut down the engine, refrigeration unit, measurement and control software in sequence, discharge residual fuel from the system, and clean the test bench; ②Data archiving: Store test data in the database and automatically generate PDF reports.

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