Spray ignition mechanism simulation test device and test method

Abstract

This invention provides a simulation test apparatus and method for the mechanism of oil mist ignition. The test apparatus includes: an ignition unit comprising a combustion chamber and an ignition source, the ignition source being movably disposed within the combustion chamber; a liquid supply unit comprising a liquid storage tank and a spray assembly, the liquid storage tank storing fuel and the spray assembly being disposed at the inlet of the combustion chamber for spraying oil mist onto the ignition source; a heating unit comprising a first heater and a second heater, the first heater heating the fuel at a first preset temperature and the second heater heating the ignition source at a second preset temperature; a pressure unit connected to the liquid storage tank and the spray assembly, delivering fuel from the liquid storage tank to the spray assembly at a preset pressure; and a moving unit connected to the ignition source, moving the ignition source to a preset position based on a preset distance. The test apparatus of this invention can conduct multiple ignition tests under varying fuel temperature, ignition source temperature, fuel pressure, and ignition source position to reliably study the mechanism of oil mist ignition heat source.

Description

Technical Field

[0001] This invention relates to the field of experimental equipment technology, and in particular to an experimental device and method for simulating the mechanism of spray ignition. Background Technology

[0002] Oil products are widely used in transportation, construction, aerospace, and other fields. Pipeline transportation is the primary method for transporting oil products. During transportation, as the transportation time increases, the pipeline's anti-corrosion layer gradually ages and deteriorates. Additionally, factors such as soil stress, natural disasters, or human damage can cause damage to the pipeline, leading to oil leaks. Under certain pressure, the leaked oil atomizes and sprays, forming suspended liquid particles. When these particles encounter high-temperature heat sources or equipment surfaces, they can ignite accidentally. Therefore, researching the spray ignition mechanism is crucial for effectively preventing and controlling oil spray fires and reducing the probability of accidental pipeline fires. Fuel atomizing burners are devices that atomize liquid fuel into fine droplets for complete combustion. They feature good atomization and ignition discharge characteristics and are used in experiments simulating accidental fires caused by pipeline leaks.

[0003] In the existing technology, the ignition methods of fuel atomizing burners mainly include direct injection ignition and compression ignition. The principle of direct injection ignition is to inject fuel directly into the cylinder, guide the airflow to form a combustible mixture with the air, and ignite the mixture through the spark plug. The principle of compression ignition is to rely on the high-pressure oil pump and the fuel injector to spray the fuel into the cylinder in a mist form, so that it can automatically ignite when it encounters the hot air.

[0004] Fuel atomizing burners with in-cylinder direct injection ignition and compression ignition ignition have certain guiding significance for the study of flame combustion mechanism, but they cannot realistically simulate the process of accidental ignition due to pipeline leakage, and cannot reliably study the influence of multiple factors such as fuel temperature, fuel pressure, heat source temperature and heat source location on the ignition mechanism. Summary of the Invention

[0005] This invention provides a spray ignition mechanism simulation test device and test method to solve the problem that existing test devices cannot reliably study the influencing factors of the ignition mechanism of oil spray.

[0006] In a first aspect, the present invention provides a spray ignition mechanism simulation test device, comprising:

[0007] An ignition unit includes a combustion chamber and an ignition source, wherein the ignition source is movably disposed within the combustion chamber;

[0008] The liquid supply unit includes a liquid storage tank and a spray assembly. The liquid storage tank is used to store fuel, and the spray assembly is located at the inlet of the combustion chamber and is used to spray oil mist onto the ignition source.

[0009] The heating unit includes a first heater and a second heater. The first heater is located in the liquid storage tank and is used to heat fuel based on a first preset temperature. The second heater is located in the combustion chamber and is used to heat the ignition source based on a second preset temperature.

[0010] A pressure unit, connected to the liquid storage tank and the spray assembly, is used to deliver fuel in the liquid storage tank to the spray assembly based on a preset pressure;

[0011] A movable unit is movably disposed in the combustion chamber. The movable unit is connected to the ignition source and is used to move the ignition source to a preset position based on a preset distance.

[0012] According to the present invention, a spray ignition mechanism simulation test device is provided, wherein the pressure unit includes a frequency converter, a drive motor and a high-pressure pump;

[0013] The variable frequency drive is connected to the drive motor, the drive motor is connected to the high-pressure pump, the suction port of the high-pressure pump is connected to the liquid storage tank, and the discharge port of the high-pressure pump is connected to the spray assembly.

[0014] According to the present invention, a spray ignition mechanism simulation test device is provided, wherein the moving unit includes a driving component and a connecting component;

[0015] The driving component has a driving end and a driven end. The driving end is located at the top of the combustion chamber, and the driven end is connected to the connecting component. A portion of the connecting component extends into the combustion chamber and is connected to the edge of the ignition source.

[0016] The spray ignition mechanism simulation test device provided by the present invention further includes a first temperature sensor, a second temperature sensor, and a controller;

[0017] Both the first temperature sensor and the second temperature sensor are connected to the controller. The first temperature sensor is used to detect the temperature of the fuel in the liquid storage tank, and the second temperature sensor is used to detect the temperature of the ignition source. The controller controls the opening and closing of the first heater based on the first temperature signal from the first temperature sensor, and controls the opening and closing of the second heater based on the second temperature signal from the second temperature sensor.

[0018] According to the spray ignition mechanism simulation test device provided by the present invention, the ignition source is a heating plate and the second heater is an electric heating tube;

[0019] The plurality of heating plates and the plurality of electric heating tubes are staggered in a direction perpendicular to the extension direction of the combustion chamber, and the electric heating tubes are used to heat the heating plates.

[0020] Secondly, the present invention provides a method for simulating the mechanism of spray ignition, based on the aforementioned device for simulating the mechanism of spray ignition, comprising:

[0021] The fuel is heated based on a first preset temperature, the ignition source is heated based on a second preset temperature, the fuel is pressurized based on a preset pressure, and the ignition source is moved to a preset position based on a preset distance.

[0022] Multiple ignition tests are conducted based on the first preset temperature to obtain the critical temperature at which the fuel is ignited by the ignition source.

[0023] Multiple ignition tests are conducted based on the second preset temperature to obtain the critical temperature at which the ignition source is ignited.

[0024] Multiple ignition tests are conducted based on the preset pressure to obtain the critical pressure at which the ignition source is ignited.

[0025] Multiple ignition tests are conducted based on the preset distance to obtain the ignition distance at which the ignition source is ignited.

[0026] According to the spray ignition mechanism simulation test method provided by the present invention, the critical temperature at which the fuel is ignited by the ignition source is obtained by conducting multiple ignition tests based on the first preset temperature. Specifically, this includes:

[0027] The second heater heats the ignition source to the second target temperature, and the moving unit moves the ignition source to the target position;

[0028] Multiple first temperatures are determined, a first heater heats the fuel to the first temperature, a pressure unit pumps the fuel at a target pressure to the spray assembly, and the spray assembly sprays fuel mist toward the ignition source;

[0029] Ignition tests are conducted based on each of the first temperatures, and the ignition source is observed to be ignited in the combustion chamber to determine the critical temperature at which the ignition source is ignited.

[0030] According to the spray ignition mechanism simulation test method provided by the present invention, the method involves conducting multiple ignition tests based on a second preset temperature to obtain the critical ignition temperature at which the ignition source is ignited. Specifically, this includes:

[0031] The first heater heats the fuel to a first target temperature, and the moving unit moves the ignition source to the target position;

[0032] Multiple second temperatures are determined, the second heater heats the ignition source to the second temperature, the pressure unit pumps fuel at a target pressure to the spray assembly, and the spray assembly sprays fuel mist onto the ignition source;

[0033] Ignition tests are conducted based on each of the second temperatures, and the ignition source is observed to be ignited in the combustion chamber to determine the critical ignition temperature at which the ignition source is ignited.

[0034] According to the spray ignition mechanism simulation test method provided by the present invention, the critical pressure of fuel ignited by the ignition source is obtained by conducting multiple ignition tests based on the preset pressure. Specifically, this includes:

[0035] The first heater heats the fuel to a first target temperature, the second heater heats the ignition source to a second target temperature, and the moving unit moves the ignition source to the target position;

[0036] Multiple fuel pressures are determined, the pressure unit pressurizes the fuel and pumps it to the spray assembly, and the spray assembly sprays fuel mist onto the ignition source;

[0037] Ignition tests are conducted based on each of the fuel pressures, and the ignition of the ignition source is observed through the combustion chamber to determine the critical fuel pressure at which the ignition source is ignited.

[0038] According to the spray ignition mechanism simulation test method provided by the present invention, the method involves conducting multiple ignition tests based on the preset distance to obtain the ignition distance at which the ignition source is ignited. Specifically, this includes:

[0039] The first heater heats the fuel to a first target temperature, and the second heater heats the ignition source to a second target temperature;

[0040] Multiple preset positions are determined, the moving unit moves the ignition source to the preset position, the pressure unit pumps fuel at the target pressure to the spray assembly, and the spray assembly sprays oil mist onto the ignition source;

[0041] Ignition tests are conducted at each of the preset positions, and the ignition source is observed to be ignited in the combustion chamber to determine the ignition distance at which the ignition source is ignited.

[0042] The spray ignition mechanism simulation test device and test method provided by this invention adjusts the fuel temperature and ignition source temperature through a heating unit, adjusts the fuel pressure through a pressure unit, and adjusts the ignition source position through a moving unit. Multiple ignition tests are conducted for multiple fuel temperatures, multiple ignition source temperatures, multiple fuel pressures, and multiple ignition source positions to reliably study the mechanism of oil mist ignition heat source. This provides guidance for the optimization of fuel pipeline transportation systems and the design of fire protection systems. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the structure of the spray ignition mechanism simulation test device provided by the present invention;

[0045] Figure 2 This is a partial cross-sectional schematic diagram of the spray ignition mechanism simulation test device provided by the present invention;

[0046] Figure 3 This is a connection diagram of the ignition source, the second heater, and the controller provided by the present invention;

[0047] Reference numerals: 1: Ignition unit; 11: Combustion chamber; 12: Ignition source; 121: Heating plate; 2: Liquid supply unit; 21: Liquid storage tank; 22: Spray assembly; 3: Pressure unit; 31: Variable frequency speed controller; 32: Drive motor; 33: High-pressure pump; 4: Moving unit; 41: Roller; 42: Roller shaft; 43: Guide screw; 44: Locking nut; 45: Support frame; 5: First heater; 6: Second heater; 7: Controller; 8: Liquid collection tank. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] The following is combined with Figures 1 to 3 This invention describes a spray ignition mechanism simulation test apparatus according to an embodiment of the present invention.

[0051] like Figure 1As shown, the spray ignition mechanism simulation test device provided in this embodiment of the invention includes: an ignition unit 1 including a combustion chamber 11 and an ignition source 12, the ignition source 12 being movably disposed within the combustion chamber 11; a liquid supply unit 2 including a liquid storage tank 21 and a spray assembly 22, the liquid storage tank 21 being used to store fuel, and the spray assembly 22 being disposed at the inlet of the combustion chamber 11 for spraying oil mist onto the ignition source 12; a heating unit including a first heater 5 and a second heater 6, the first heater 5 being disposed within the liquid storage tank 21 for heating fuel based on a first preset temperature, and the second heater 6 being disposed within the combustion chamber 11 for heating the ignition source 12 based on a second preset temperature; a pressure unit 3 connected to the liquid storage tank 21 and the spray assembly 22 for conveying fuel from the liquid storage tank 21 to the spray assembly 22 based on a preset pressure; and a moving unit 4 movably disposed within the combustion chamber 11, the moving unit 4 being connected to the ignition source 12 for moving the ignition source 12 to a preset position based on a preset distance.

[0052] Specifically, the ignition unit 1 includes a combustion chamber 11 and an ignition source 12. The combustion chamber 11 is made of a transparent, corrosion-resistant, high-temperature resistant, and high-pressure resistant material, such as transparent quartz glass, to facilitate observation of fuel atomization, flow, and ignition of the ignition source 12 within the combustion chamber 11. The cross-sectional shape of the combustion chamber 11 is not specifically limited; for example, it can be cylindrical, square, etc. Both ends of the combustion chamber 11 are open along its extension direction. The combustion chamber 11 is horizontally positioned, and the ignition source 12 is installed within it. The ignition source 12 is parallel to the cross-section of the combustion chamber 11 and can move within it along its extension direction, defined as the length direction.

[0053] The fuel supply unit 2 is located near the ignition unit 1. The fuel supply unit 2 includes a fuel storage tank 21 and a spray assembly 22. The size of the fuel storage tank 21 is determined according to requirements. The fuel storage tank 21 is made of corrosion-resistant steel plate and is connected to the spray assembly 22 via a delivery pipeline. The spray assembly 22 is installed at the inlet of the combustion chamber 11 and is used to atomize the fuel delivered by the delivery pipeline to form an oil mist of a preset particle size. The oil mist can be sprayed horizontally onto the surface of the ignition source 12. The fuel stored in the fuel storage tank 21 in this invention includes gasoline, diesel, kerosene, lubricating oil, hydraulic oil, and edible oil, etc. The ignition mechanism of these oils is studied using an experimental device.

[0054] A fuel inlet is provided on the top plate of the reservoir 21. A filter can be installed at the fuel inlet of the reservoir 21 to remove impurities from the fuel. A display screen can be installed on the side wall of the reservoir 21 to display parameters such as fuel level, fuel pressure, and fuel temperature. The spray assembly 22 includes a nozzle, a safety valve, and a pressure relief valve. The nozzle can be a single-hole nozzle and is installed at the inlet of the combustion chamber 11. The safety valve and the pressure relief valve are sequentially located on the delivery pipeline connecting the nozzle and the reservoir 21.

[0055] The heating unit includes a first heater 5 and a second heater 6. The first heater 5 is installed inside the liquid storage tank 21 and is used to heat the fuel inside the tank 21 to a first preset temperature according to test requirements. The fuel can be heated to the first preset temperature by controlling parameters such as the heating duration and heating power of the first heater 5. The second heater 6 is installed inside the combustion chamber 11 and is connected to the ignition source 12 to heat the ignition source 12 to a second preset temperature according to test requirements. The ignition source 12 can also be heated to the second preset temperature by controlling parameters such as the heating duration and heating power of the second heater 6.

[0056] The pressure unit 3 is connected to the liquid storage tank 21 and the spray assembly 22 through two delivery pipelines respectively. The pressure unit 3 is used to pressurize the fuel in the liquid storage tank 21 and pump the fuel at the preset pressure to the spray assembly 22, which then sprays the atomized oil mist onto the surface of the ignition source 12.

[0057] The moving unit 4 can be installed on the top of the combustion chamber 11 or on the side of the combustion chamber 11. For example, the moving unit 4 can be installed on the top surface of the combustion chamber 11. The moving unit 4 has a driving end and a driven end. The driven end extends into the combustion chamber 11 and is connected to the ignition source 12. The driving end moves along the length of the combustion chamber 11, driving the ignition source 12 to a preset position. At this time, the distance between the ignition source 12 and the entrance of the combustion chamber 11 is a preset distance.

[0058] The fuel in the storage tank 21 is heated to a first preset temperature range by the first heater 5. The first preset temperature range includes multiple first temperatures, which are the fuel temperatures, and these multiple first temperatures exhibit an increasing or decreasing trend. The temperature of the ignition source 12, the fuel pressure, and the distance between the ignition source 12 and the inlet of the combustion chamber 11 are all adjusted to a fixed value, and an ignition test is performed for each first temperature. The reaction process after the ignition source 12 comes into contact with the oil mist is observed visually or captured by an image acquisition unit. This allows for the study and analysis of the ignition process of the fuel temperature on the oil mist ignition heat source.

[0059] The ignition source 12 in the combustion chamber 11 is heated to a second preset temperature by the second heater 6. This second preset temperature includes multiple second temperatures, which are the ignition source temperatures, and these temperatures exhibit an increasing or decreasing trend. The fuel temperature, fuel pressure, and distance between the ignition source 12 and the inlet of the combustion chamber 11 are all adjusted to constant values. An ignition test is conducted for each second temperature. The reaction process after the ignition source 12 comes into contact with the oil mist is observed visually or captured by an image acquisition unit. This allows for the study and analysis of the ignition process of the ignition source temperature affecting the oil mist ignition heat source.

[0060] The fuel in the storage tank 21 is adjusted to a preset pressure via pressure unit 3. This preset pressure includes multiple fuel pressure values, which exhibit an increasing or decreasing trend. The fuel temperature, the ignition source 12 temperature, and the distance between the ignition source 12 and the inlet of the combustion chamber 11 are all adjusted to a fixed value. An ignition test is conducted for each fuel pressure value. The reaction process after the ignition source 12 comes into contact with the oil mist is observed visually or captured by an image acquisition unit. This allows for the study and analysis of the ignition process of fuel pressure igniting the oil mist heat source.

[0061] The distance between the ignition source 12 and the inlet of the combustion chamber 11 is adjusted to a preset distance using the moving unit 4. This preset distance includes multiple ignition source positions. The fuel temperature, the temperature of the ignition source 12, and the fuel pressure are all adjusted to fixed values. An ignition test is conducted for each ignition source position. The reaction process after the ignition source 12 comes into contact with the oil mist is observed visually or captured by an image acquisition unit. This allows for the study and analysis of the ignition process of the ignition source position igniting the heat source of the oil mist.

[0062] The aforementioned experimental setup, considering four factors—fuel temperature, fuel pressure, ignition source temperature, and ignition source location—adjusts three of them to constant values, leaving the remaining factor as a variable. Multiple experiments are conducted on this variable to determine the impact of fuel temperature, fuel pressure, ignition source temperature, and ignition source location on the ignition source of oil mist. This allows for the study and analysis of the mechanism of oil mist ignition heat sources, accurately simulating the accidental ignition process in pipelines and providing guidance for the optimization of fuel pipeline transportation systems and the design of fire protection systems.

[0063] In this embodiment of the invention, the fuel temperature and ignition source temperature are adjusted by the heating unit, the fuel pressure is adjusted by the pressure unit 3, and the ignition source position is adjusted by the moving unit 4. Multiple ignition tests are conducted for multiple fuel temperatures, multiple ignition source temperatures, multiple fuel pressures, and multiple ignition source positions to reliably study the mechanism of oil mist ignition heat source, which has a guiding role in the optimization of fuel pipeline transportation systems and the design of fire protection systems.

[0064] like Figure 1 As shown, in an optional embodiment, the pressure unit 3 includes a frequency converter 31, a drive motor 32, and a high-pressure pump 33; the frequency converter 31 is connected to the drive motor 32, the drive motor 32 is connected to the high-pressure pump 33, the suction port of the high-pressure pump 33 is connected to the liquid storage tank 21, and the discharge port of the high-pressure pump 33 is connected to the spray assembly 22.

[0065] Specifically, the speed of the drive motor 32 is adjusted by the variable frequency drive 31, thereby achieving speed regulation of the drive motor 32, which in turn drives the high-pressure pump 33. The suction port of the high-pressure pump 33 is connected to the bottom of the liquid storage tank 21 through a first delivery pipeline, and the discharge port of the high-pressure pump 33 is connected to the spray assembly 22 through a second delivery pipeline. The operation of the high-pressure pump 33 pressurizes the intake fuel, and the high-pressure fuel flows along the second delivery pipeline to the spray assembly 22, where the spray assembly 22 atomizes the high-pressure fuel. The variable frequency drive 31 can be a voltage-type frequency converter, including a rectifier, a filter, and an inverter.

[0066] The fuel pressure can be easily adjusted by the variable frequency speed controller 31, drive motor 32 and high pressure pump 33, which helps to improve test efficiency when conducting multiple ignition tests based on fuel pressure.

[0067] In an optional embodiment, the moving unit 4 includes a driving member and a connecting member; the driving member has a driving end and a driven end, the driving end is located at the top of the combustion chamber 11, the driven end is connected to the connecting member, and a portion of the connecting member extends into the combustion chamber 11 and is connected to the edge of the ignition source 12.

[0068] Specifically, the moving unit 4 is located at the top of the combustion chamber 11. The moving unit 4 can be a screw drive mechanism, a gear and rack drive mechanism, a crank and slider mechanism, an electric push rod mechanism, or a cylinder, etc., which can drive the ignition source 12 to move along the extension direction of the combustion chamber 11.

[0069] like Figure 2As shown, the moving unit 4 has a driving end and a driven end. For example, the moving unit 4 includes rollers 41 and roller shafts 42. The two rollers 41 are spaced apart along the width direction of the combustion chamber 11, and the two ends of the roller shaft 42 are respectively connected to the two rollers 41 one by one. The connecting parts include a guide screw 43, a locking nut 44, and a support frame 45. The guide screw 43 is sleeved on the roller shaft 42. The support frame 45 includes a horizontal plate and a vertical plate. The horizontal plate is threadedly connected to the guide screw 43 and locked by the locking nut 44. One end of the vertical plate is connected to the horizontal plate, and the other end of the vertical plate passes through the combustion chamber 11 and connects to the top of the ignition source 12. Thus, the rollers 41 roll along the length direction of the combustion chamber 11, which can drive the ignition source 12 to move, and the position of the ignition source 12 can be easily adjusted.

[0070] The position of the ignition source 12 can be easily adjusted by moving unit 4, which helps to improve the efficiency of multiple ignition tests at the ignition source position.

[0071] In an optional embodiment, the test apparatus further includes a first temperature sensor, a second temperature sensor, and a controller 7; both the first and second temperature sensors are connected to the controller 7, the first temperature sensor is used to detect the temperature of the fuel in the storage tank 21, and the second temperature sensor is used to detect the temperature of the ignition source 12; the controller 7 controls the opening and closing of the first heater 5 based on the first temperature signal from the first temperature sensor, and controls the opening and closing of the second heater 6 based on the second temperature signal from the second temperature sensor.

[0072] like Figure 1 As shown, specifically, the first temperature sensor is used to detect the temperature of the fuel in the storage tank 21, and the first heater 5 heats the fuel in the storage tank 21. The first temperature sensor detects the fuel temperature in real time. The controller 7 is communicatively connected to the first temperature sensor and is also connected to the first heater 5. The controller 7 controls the working time of the first heater 5 according to the first temperature signal, so that the fuel temperature reaches the temperature required for the test.

[0073] The second temperature sensor is used to detect the temperature of the ignition source 12 inside the combustion chamber 11. The second heater heats the ignition source 12 inside the combustion chamber 11. The second temperature sensor detects the temperature of the ignition source 12 in real time. The controller 7 is communicatively connected to the second temperature sensor and is also connected to the second heater 6. The controller 7 controls the working time of the second heater according to the second temperature signal so that the ignition source temperature reaches the temperature required for the test.

[0074] Furthermore, pressure unit 3 is connected to controller 7. Controller 7 sets the fuel pressure and adjusts the fuel pressure through pressure unit 3 to ensure that the fuel pressure meets the test pressure requirements. Moving unit 4 is connected to controller 7. Controller 7 sets the ignition source position and adjusts the ignition source position through moving unit 4 to ensure that the distance to the ignition source position meets the test distance requirements.

[0075] In this embodiment of the invention, the controller 7 controls the working time of the first heater 5 according to the first temperature signal of the first temperature sensor, and controls the working time of the second heater 6 according to the second temperature signal of the second temperature sensor, so as to ensure that the fuel temperature and ignition source temperature meet the test temperature requirements, thereby helping to ensure the reliability of the test results.

[0076] like Figure 3 As shown, in an optional embodiment, the ignition source 12 is a heating plate 121, and the second heater 6 is an electric heating tube; multiple heating plates 121 and multiple electric heating tubes are staggered in a direction perpendicular to the extension direction of the combustion chamber 11, and the electric heating tubes are used to heat the heating plate 121.

[0077] Specifically, the ignition source 12 is a heating plate 121. The material of the heating plate 121 is not specifically limited. For example, the heating plate 121 can be made of stainless steel, cast aluminum, cast iron, cast copper, silicon carbide, or ceramic. The heating plate 121 is elongated, and its length matches the width of the combustion chamber 11.

[0078] The second heater 6 is an electric heating element, the length of which matches the width of the combustion chamber 11. Multiple heating plates 121 and multiple electric heating elements are staggered along the height of the combustion chamber 11. When multiple electric heating elements are energized, they generate heat and transfer it to multiple heating plates 121. By controlling the energizing time and current of the electric heating elements, the temperature of the ignition source 12 can be easily adjusted. At the same time, the heating plate 121 has a plate-like structure, and the oil mist sprayed by the spray assembly 22 can make full surface contact with the surface of the heating plate 121, maximizing the simulation of the actual working condition of oil mist from pipeline leakage contacting the heat source.

[0079] Furthermore, such as Figure 1 As shown, the test apparatus also includes a collection tank 8, which is spaced apart from the storage tank 21. The distance between the collection tank 8 and the storage tank 21 matches the length of the combustion chamber 11. The collection tank 8 is open, and its top is aligned with the end of the combustion chamber 11 away from the spray assembly 22, for collecting waste oil flowing out of the combustion chamber 11.

[0080] In this embodiment of the invention, multiple heating plates 121 and multiple electric heating tubes are staggered along the height direction of the combustion chamber 11, which is beneficial for quickly adjusting the temperature of the ignition source 12, and at the same time, it simulates the actual working condition of oil mist from pipeline leakage coming into contact with the heat source to the greatest extent, thus ensuring the reliability of the test results.

[0081] This invention also provides a method for simulating the spray ignition mechanism, based on the above-mentioned spray ignition mechanism simulation test device, the test method including:

[0082] The fuel is heated based on a first preset temperature, the ignition source 12 is heated based on a second preset temperature, the fuel is pressurized based on a preset pressure, and the ignition source 12 is moved to a preset position based on a preset distance.

[0083] Multiple ignition tests were conducted based on the first preset temperature to obtain the critical temperature of the fuel ignited by the ignition source 12.

[0084] Multiple ignition tests were conducted based on the second preset temperature to obtain the critical temperature at which the ignition source 12 was ignited.

[0085] Multiple ignition tests were conducted based on a preset pressure to obtain the critical pressure of the fuel ignited by ignition source 12.

[0086] Multiple ignition tests were conducted based on a preset distance to obtain the ignition distance at which the ignition source 12 was ignited.

[0087] Specifically, referring to the description above, the test apparatus includes an ignition unit 1, a fuel supply unit 2, a heating unit, a pressure unit 3, and a moving unit 4. The ignition unit 1 includes a combustion chamber 11 and an ignition source 12 disposed within the combustion chamber 11. The moving unit 4 is movably connected to the combustion chamber 11 and can move along the length of the combustion chamber 11, driving the ignition source 12 to move. A spray assembly 22 is installed at the inlet of the combustion chamber 11, and the spray direction of the spray assembly 22 is consistent with the length of the combustion chamber 11. The pressure unit 3 is connected to a fuel storage tank 21 via a first delivery pipeline and to a nozzle assembly via a second delivery pipeline. The pressure unit 3 is used to pressurize the fuel. The heating unit includes a first heater 5 and a second heater 6. The first heater 5 is installed in the fuel storage tank 21 and is used to heat the fuel. The second heater 6 is installed in the combustion chamber 11 and is used to heat the ignition source 12.

[0088] Several factors are required for the oil mist to ignite the ignition source 12. For example, the temperature of the fuel, the temperature of the ignition source 12, the pressure of the fuel, and the distance between the ignition source 12 and the oil mist all affect whether the oil mist can ignite the ignition source 12.

[0089] Multiple ignition tests are conducted within a first preset temperature range of 10–50 degrees Celsius. The reaction process after the ignition source 12 comes into contact with the oil mist is observed visually or captured by an image acquisition unit. Based on the results of multiple ignition tests, the ignition process of the fuel temperature on the oil mist ignition heat source can be studied and analyzed. At the same time, the fuel critical temperature can be obtained from the fuel temperature set when the ignition source 12 is initially ignited.

[0090] Multiple ignition tests were conducted within a second preset temperature range of 50–750 degrees Celsius. The reaction process after the ignition source 12 came into contact with the oil mist was observed visually or captured by an image acquisition unit. Based on the results of the multiple ignition tests, the ignition process of the ignition source temperature on the oil mist ignition heat source could be studied and analyzed. At the same time, the critical temperature of the ignition source could be obtained from the ignition source temperature set when the ignition source 12 was initially ignited.

[0091] Within a preset pressure range of 0–20 MPa, multiple ignition tests are conducted. The reaction process after the ignition source 12 comes into contact with the oil mist is observed visually or captured by an image acquisition unit. Based on the results of multiple ignition tests, the ignition process of the fuel pressure on the oil mist ignition heat source can be studied and analyzed. At the same time, the fuel critical pressure can be obtained from the fuel pressure set when the ignition source 12 is initially ignited.

[0092] Within a preset distance range of 100–3000 mm, multiple ignition tests are conducted. The reaction process after the ignition source 12 comes into contact with the oil mist is observed visually or captured by an image acquisition unit. Based on the results of multiple ignition tests, the ignition process of the ignition source position igniting the oil mist heat source can be studied and analyzed. At the same time, the ignition distance can be obtained from the ignition source position set when the ignition source 12 is initially ignited.

[0093] In this embodiment of the invention, the fuel temperature and ignition source temperature are adjusted by the heating unit, the fuel pressure is adjusted by the pressure unit 3, and the ignition source position is adjusted by the moving unit 4. Test parameters are set, and ignition tests are conducted for multiple fuel temperatures, multiple ignition source temperatures, multiple fuel pressures, and multiple ignition source positions. Oil mist is sprayed onto the ignition source 12 by the spray assembly 22. The reaction process after the ignition source 12 comes into contact with the oil mist is observed by the naked eye or captured by the image acquisition unit. This allows for the study and analysis of the ignition process of oil mist igniting the ignition source by fuel temperature, fuel pressure, ignition source temperature, and ignition source position, accurately simulating the accidental fire process in pipelines, and providing guidance for the optimization of fuel pipeline transportation systems and the design of fire protection systems.

[0094] In an optional embodiment, performing multiple ignition tests based on a first preset temperature to obtain the critical temperature at which the fuel ignited by the ignition source 12 is ignited specifically includes:

[0095] The second heater 6 heats the ignition source 12 to the second target temperature, and the moving unit 4 moves the ignition source 12 to the target position;

[0096] Multiple first temperatures are determined. The first heater 5 heats the fuel to the first temperature. The pressure unit 3 pumps the fuel at the target pressure to the spray assembly 22. The spray assembly 22 sprays fuel mist onto the ignition source 12.

[0097] Ignition tests are conducted based on each first temperature, and the ignition of the ignition source 12 is observed through the combustion chamber 11 to determine the critical temperature at which the ignition source 12 is ignited.

[0098] Specifically, both the first temperature sensor and the second temperature sensor are connected to the controller 7. The controller 7 sets the second target temperature of the ignition source 12, as well as the target pressure of the fuel and the target distance of the ignition source 12. The second target temperature, target pressure, and target distance are all constant values.

[0099] The ignition source 12 is heated to the second target temperature by the second heater 6, and the ignition source 12 is moved to the target position by the moving unit 4. Multiple first temperatures are determined based on a first preset temperature range, and these first temperatures increase in an ascending trend. An ignition test is performed for each first temperature. The controller 7 determines that the fuel temperature has reached the set first temperature and the ignition source 12 temperature has reached the target temperature based on the first temperature signal detected by the first temperature sensor and the second temperature signal detected by the second temperature sensor. Then, the frequency converter 31 and drive motor 32 are turned on, and the high-pressure pump 33 pumps fuel at the target pressure to the spray assembly 22. The spray assembly 22 sprays fuel mist onto the heating plate 121. The test process is observed through the transparent combustion chamber 11. After the atomized suspended liquid particles come into contact with the heating plate 121 at the target temperature, combustion may occur in the horizontally set combustion chamber 11.

[0100] After one ignition test is completed, the variable frequency drive 31 and drive motor 32 are turned off. The first heater 5 continues to heat the fuel according to the multiple fuel temperatures set by the controller 7 until the fuel temperature reaches the next set first temperature. The above steps are repeated to conduct the next ignition test.

[0101] Multiple ignition tests were conducted based on multiple first temperatures. Based on the results of these multiple ignition tests, the ignition process of the fuel temperature on the oil mist ignition heat source can be studied and analyzed. At the same time, the fuel critical temperature can be obtained from the fuel temperature set when the ignition source 12 is initially ignited.

[0102] In an optional embodiment, performing multiple ignition tests based on a second preset temperature to obtain the critical ignition temperature at which the ignition source 12 is ignited specifically includes:

[0103] The first heater 5 heats the fuel to the first target temperature, and the moving unit 4 moves the ignition source 12 to the target position;

[0104] Multiple second temperatures are determined, the second heater 6 heats the ignition source 12 to the second temperature, and the pressure unit 3 pumps fuel at the target pressure to the spray assembly 22, which sprays fuel mist onto the ignition source 12.

[0105] Ignition tests are conducted based on each second temperature, and the ignition source 12 is ignited by observing the combustion chamber 11 to determine the critical ignition temperature at which the ignition source 12 is ignited.

[0106] Specifically, the first target temperature of the fuel is set by the controller 7, and the target pressure of the fuel and the target distance of the ignition source 12 are also set. The first target temperature, target pressure and target distance are all constant values.

[0107] The fuel is heated to a first target temperature by the first heater 5, and the ignition source 12 is moved to the target position by the moving unit 4. Multiple second temperatures are determined based on a second preset temperature range, and these multiple second temperatures show an increasing trend. An ignition test is performed for each second temperature. The controller 7 determines that the fuel temperature has reached the first target temperature and the ignition source 12 temperature has reached the set second temperature based on the first temperature signal detected by the first temperature sensor and the second temperature signal detected by the second temperature sensor. The variable frequency drive 31 and the drive motor 32 are then turned on, and the high-pressure pump 33 pumps fuel at the target pressure to the spray assembly 22. The spray assembly 22 sprays fuel mist onto the heating plate 121. The test process is observed through the transparent combustion chamber 11. After the atomized suspended liquid particles come into contact with the heating plate 121 at the second temperature, combustion may occur in the horizontally set combustion chamber 11.

[0108] After one ignition test is completed, the variable frequency drive 31 and drive motor 32 are turned off. The second heater 6 continues to heat the ignition source 12 according to the multiple ignition source temperatures set by the controller 7 until the ignition source temperature reaches the next set second temperature. The above steps are repeated to conduct the next ignition test.

[0109] Multiple ignition tests were conducted based on multiple second temperatures. Based on the results of these multiple ignition tests, the ignition process of the ignition source temperature on the oil mist ignition heat source can be studied and analyzed. At the same time, the critical temperature of the ignition source can be obtained from the ignition source temperature set when the ignition source 12 is initially ignited.

[0110] In an optional embodiment, performing multiple ignition tests based on a preset pressure to obtain the critical pressure at which the fuel ignited by the ignition source 12 is ignited specifically includes:

[0111] The first heater 5 heats the fuel to the first target temperature, the second heater 6 heats the ignition source 12 to the second target temperature, and the moving unit 4 moves the ignition source 12 to the target position;

[0112] Multiple fuel pressures are determined, and the pressure unit 3 pressurizes the fuel and pumps it to the spray assembly 22. The spray assembly 22 sprays fuel mist onto the ignition source 12.

[0113] Ignition tests were conducted based on each fuel pressure, and the ignition of the ignition source 12 was observed through the combustion chamber 11 to determine the critical fuel pressure at which the ignition source 12 was ignited.

[0114] Specifically, the controller 7 sets the first target temperature of the fuel and the second target temperature of the ignition source 12, and at the same time sets the target distance of the ignition source 12. The first target temperature, the second target temperature and the target distance are all constant values.

[0115] The fuel is heated to a first target temperature by the first heater 5, and the ignition source 12 is heated to a second target temperature by the second heater 6. The ignition source 12 is then moved to the target position by the moving unit 4.

[0116] Multiple fuel pressures are determined based on a preset pressure range, and these fuel pressures show an increasing trend. An ignition test is performed for each fuel pressure. The controller 7 determines that the fuel temperature has reached the set first target temperature and the ignition source 12 temperature has reached the set second target temperature based on the first temperature signal detected by the first temperature sensor and the second temperature signal detected by the second temperature sensor. The variable frequency drive 31 and the drive motor 32 are turned on, and the speed of the variable frequency drive 31 is adjusted to the set speed. The high-pressure pump 33 pumps the fuel at the set fuel pressure to the spray assembly 22. The spray assembly 22 sprays oil mist onto the heating plate 121. The test process is observed through the transparent combustion chamber 11. After the atomized suspended liquid particles come into contact with the heating plate 121, combustion may occur in the horizontally set combustion chamber 11.

[0117] After one ignition test is completed, turn off the frequency converter 31 and the drive motor 32, and set the speed of the drive motor 32 to the next speed through the frequency converter 31. Repeat the above steps to perform the next ignition test.

[0118] Multiple ignition tests were conducted based on multiple fuel pressures. Based on the results of these tests, the ignition process of the fuel pressure on the oil mist ignition heat source can be studied and analyzed. At the same time, the critical fuel pressure can be obtained from the fuel pressure set when the ignition source 12 is initially ignited.

[0119] In an optional embodiment, performing multiple ignition tests based on a preset distance to obtain the ignition distance at which the ignition source 12 is ignited specifically includes:

[0120] The first heater 5 heats the fuel to the first target temperature, and the second heater 6 heats the ignition source 12 to the second target temperature;

[0121] Multiple preset positions are determined, the moving unit 4 moves the ignition source 12 to the preset position, and the pressure unit 3 pumps fuel at the target pressure to the spray assembly 22, and the spray assembly 22 sprays oil mist onto the ignition source 12.

[0122] Ignition tests are conducted at each preset location, and the ignition of the ignition source 12 is observed through the combustion chamber 11 to determine the ignition distance at which the ignition source 12 is ignited.

[0123] Specifically, the controller 7 sets the first target temperature of the fuel and the second target temperature of the ignition source 12, and simultaneously sets the target pressure of the fuel. The first target temperature, the second target temperature, and the target pressure are all constant values. The first heater 5 heats the fuel to the first target temperature, and the second heater 6 heats the ignition source 12 to the second target temperature.

[0124] Multiple preset positions of the ignition source are determined based on a preset distance range. The distance from the nozzle to each preset position increases progressively. An ignition test is performed at each preset position of the ignition source. The controller 7 determines that the fuel temperature has reached the set first target temperature and the ignition source 12 temperature has reached the set second target temperature based on the first temperature signal detected by the first temperature sensor and the second temperature signal detected by the second temperature sensor. The variable frequency drive 31 and the drive motor 32 are turned on, with the speed of the variable frequency drive 31 set to the target speed, so that the fuel pressure reaches the target pressure. The spray assembly 22 sprays oil mist onto the heating plate 121. The test process is observed through the transparent combustion chamber 11. After the atomized suspended liquid particles come into contact with the heating plate 121 at the second temperature, combustion may occur in the horizontally set combustion chamber 11.

[0125] After one ignition test is completed, the variable frequency speed controller 31 and drive motor 32 are turned off. The moving unit 4 moves the ignition source 12 to the next preset position according to the set ignition source distance. The above steps are repeated to conduct the next ignition test.

[0126] Multiple ignition tests were conducted at multiple ignition source locations. Based on the results of these tests, the ignition process of the ignition source location igniting the oil mist heat source can be studied and analyzed. At the same time, the ignition distance at which the ignition source 12 is ignited can be obtained from the preset distance set when the ignition source 12 is initially ignited.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for simulating the mechanism of spray ignition, based on a device for simulating the mechanism of spray ignition, characterized in that, The spray ignition mechanism simulation test device includes: An ignition unit includes a combustion chamber and an ignition source, wherein the ignition source is movably disposed within the combustion chamber; the combustion chamber is arranged horizontally, and the ignition source is arranged parallel to the cross-section of the combustion chamber; The liquid supply unit includes a liquid storage tank and a spray assembly. The liquid storage tank is used to store fuel, and the spray assembly is located at the inlet of the combustion chamber and is used to spray oil mist horizontally toward the ignition source. The heating unit includes a first heater and a second heater. The first heater is located in the liquid storage tank and is used to heat fuel based on a first preset temperature. The second heater is located in the combustion chamber and is used to heat the ignition source based on a second preset temperature. A pressure unit, connected to the liquid storage tank and the spray assembly, is used to deliver fuel in the liquid storage tank to the spray assembly based on a preset pressure; A movable unit is movably disposed in the combustion chamber. The movable unit is connected to the ignition source and is used to drive the ignition source to move along the extension direction of the combustion chamber to a preset position within the combustion chamber based on a preset distance. The ignition source is a heating plate, and the second heater is an electric heating tube; The plurality of heating plates and the plurality of electric heating tubes are staggered in a direction perpendicular to the extension direction of the combustion chamber, and the electric heating tubes are used to heat the heating plates; The simulation test method for the spray ignition mechanism includes: The fuel is heated based on a first preset temperature, the ignition source is heated based on a second preset temperature, the fuel is pressurized based on a preset pressure, and the ignition source is moved to a preset position based on a preset distance. Multiple ignition tests are conducted based on the first preset temperature to obtain the critical temperature at which the fuel is ignited by the ignition source. Multiple ignition tests are conducted based on the second preset temperature to obtain the critical temperature at which the ignition source is ignited. Multiple ignition tests are conducted based on the preset pressure to obtain the critical pressure at which the ignition source is ignited. Multiple ignition tests are conducted based on the preset distance to obtain the ignition distance at which the ignition source is ignited.

2. The spray ignition mechanism simulation test method according to claim 1, characterized in that, The pressure unit includes a frequency converter, a drive motor, and a high-pressure pump; The variable frequency drive is connected to the drive motor, the drive motor is connected to the high-pressure pump, the suction port of the high-pressure pump is connected to the liquid storage tank, and the discharge port of the high-pressure pump is connected to the spray assembly.

3. The method for simulating the spray ignition mechanism according to claim 1, characterized in that, The moving unit includes a driving component and a connecting component; The driving component has a driving end and a driven end. The driving end is located at the top of the combustion chamber, and the driven end is connected to the connecting component. A portion of the connecting component extends into the combustion chamber and is connected to the edge of the ignition source.

4. The spray ignition mechanism simulation test method according to claim 1, characterized in that, It also includes a first temperature sensor, a second temperature sensor, and a controller; Both the first temperature sensor and the second temperature sensor are connected to the controller. The first temperature sensor is used to detect the temperature of the fuel in the liquid storage tank, and the second temperature sensor is used to detect the temperature of the ignition source. The controller controls the opening and closing of the first heater based on the first temperature signal from the first temperature sensor, and controls the opening and closing of the second heater based on the second temperature signal from the second temperature sensor.

5. The method for simulating the spray ignition mechanism according to claim 1, characterized in that, Based on the first preset temperature, multiple ignition tests are conducted to obtain the critical temperature at which the fuel is ignited by the ignition source. This specifically includes: The second heater heats the ignition source to the second target temperature, and the moving unit moves the ignition source to the target position; Multiple first temperatures are determined, a first heater heats the fuel to the first temperature, a pressure unit pumps the fuel at a target pressure to the spray assembly, and the spray assembly sprays fuel mist toward the ignition source; Ignition tests are conducted based on each of the first temperatures, and the ignition source is observed to be ignited in the combustion chamber to determine the critical temperature at which the ignition source is ignited.

6. The method for simulating the spray ignition mechanism according to claim 1, characterized in that, Based on the second preset temperature, multiple ignition tests are conducted to obtain the critical ignition temperature at which the ignition source is ignited. This specifically includes: The first heater heats the fuel to a first target temperature, and the moving unit moves the ignition source to the target position; Multiple second temperatures are determined, the second heater heats the ignition source to the second temperature, the pressure unit pumps fuel at a target pressure to the spray assembly, and the spray assembly sprays fuel mist onto the ignition source; Ignition tests are conducted based on each of the second temperatures, and the ignition source is observed to be ignited in the combustion chamber to determine the critical ignition temperature at which the ignition source is ignited.

7. The method for simulating the spray ignition mechanism according to claim 1, characterized in that, To obtain the critical pressure at which the ignition source is ignited by conducting multiple ignition tests based on the preset pressure, the specific steps include: The first heater heats the fuel to a first target temperature, the second heater heats the ignition source to a second target temperature, and the moving unit moves the ignition source to the target position; Multiple fuel pressures are determined, the pressure unit pressurizes the fuel and pumps it to the spray assembly, and the spray assembly sprays fuel mist onto the ignition source; Ignition tests are conducted based on each of the fuel pressures, and the ignition of the ignition source is observed through the combustion chamber to determine the critical fuel pressure at which the ignition source is ignited.

8. The method for simulating the spray ignition mechanism according to claim 1, characterized in that, To obtain the ignition distance at which the ignition source is ignited, multiple ignition tests are conducted based on the preset distance. Specifically, this includes: The first heater heats the fuel to a first target temperature, and the second heater heats the ignition source to a second target temperature; Multiple preset positions are determined, the moving unit moves the ignition source to the preset position, the pressure unit pumps fuel at the target pressure to the spray assembly, and the spray assembly sprays oil mist onto the ignition source; Ignition tests are conducted at each of the preset positions, and the ignition source is observed to be ignited in the combustion chamber to determine the ignition distance at which the ignition source is ignited.

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