Supercritical kerosene pretreatment system

Abstract

The supercritical kerosene pretreatment system comprises a high-pressure gas source, a first-stage heater, a second-stage heater and a detection supply device which are sequentially connected and communicated, the high-pressure gas source is used for outputting high-pressure gas to the primary heater; the first-stage heater comprises a heat preservation oil storage tank and a heating part. The input end of the heat-preservation oil storage tank is communicated with the gas outlet end of the high-pressure gas source, and the output end of the heat-preservation oil storage tank is communicated with the input end of the secondary heater; the heating part is used for heating the temperature in the heat preservation oil storage tank to be below the coking temperature of kerosene; the secondary heater is of a structure for performing heat exchange heating by using molten salt; the detection supply device comprises a standard conveying pipeline and a non-standard conveying pipeline which are opposite in opening and closing state. When the detection supply device detects that the temperature of the kerosene output by the secondary heater reaches the standard, the standard conveying pipeline is controlled to output the kerosene, and otherwise, the non-standard conveying pipeline is controlled to output the kerosene; therefore, accurate temperature regulation and control of high-flow kerosene are realized.

Description

Technical Field

[0001] This invention relates to the technical field of kerosene pretreatment, and particularly to a supercritical kerosene pretreatment system. Background Technology

[0002] For advanced aero engines such as rotating detonation engines, the average temperature of the inner wall surface in the core area of ​​the combustion chamber is higher than 2000K, and in some places it may even exceed 2500K. After long-term operation, it is very easy for ablation to occur.

[0003] Regenerative cooling technology is one of the key technologies for thermal protection of hypersonic power plants. To avoid introducing additional coolant and increasing the overall weight, the engine's own liquid hydrocarbon fuel is used to cool the engine walls. Meanwhile, to meet the engine's fuel supply and atomization requirements, future engine fuel injection pressures are expected to reach 5 MPa.

[0004] RP-3 aviation kerosene, a commonly used fuel for aircraft, has a critical pressure between 2.2 and 2.4 MPa and a critical temperature between 630 and 660 K, both lower than the operating temperature of rotating detonation engines. This indicates that future rotating detonation engines will operate in supercritical conditions, where both temperature and pressure exceed the fuel's thermodynamic critical temperature. In this case, the principles of conventional subcritical combustion no longer apply. Therefore, understanding the characteristics of supercritical kerosene is one of the key issues urgently needing to be addressed in the field of high-performance aerospace propulsion research.

[0005] Currently, kerosene heating systems are widely used in supercritical kerosene research, but their flow rates are mostly small, and the research focuses primarily on the physical properties of kerosene. However, practical engineering applications require a large flow rate of supercritical kerosene, and designs based on existing technologies are prone to problems such as insufficient and uneven heat exchange.

[0006] Existing heating systems mostly use single-stage heating. For hydrocarbon fuels such as aerospace kerosene, coking and other problems are prone to occur at high temperatures. Single-stage heating results in kerosene remaining in a high-temperature environment for a long time, which can easily lead to prolonged excessively high kerosene temperatures and coking. This may cause damage to downstream ball valves, blockage of fuel injection rings, and other problems, affecting the normal operation of the engine.

[0007] Existing heating methods mainly include gas generator heating and electric heating. High-temperature gas flows into the heat exchange chamber through the gas generator nozzle and exchanges heat with kerosene through the heat exchange tubes, thereby heating the kerosene. However, this existing heating technology is combustion heating, which requires precise control of the kerosene temperature, and the hot kerosene experiences significant temperature loss during its flow.

[0008] In one study, supercritical kerosene was prepared using a two-stage electric heating device. The first-stage heater can heat kerosene at a flow rate of 15 g / s to 520 K, with negligible coking deposition; the second-stage heater can rapidly heat the kerosene to 760 K within 1 second; furthermore, a heating belt with a limiting temperature of 600 °C is used to compensate for heat loss between the heater outlet and the nozzle inlet. However, this method consumes a large amount of electricity under high flow conditions, and the temperature compensation area is limited, making it difficult to precisely control the final injection temperature of the kerosene.

[0009] In another study, kerosene was heated by using resistance wires spaced around the outside of the kerosene fuel pipeline, reaching a maximum temperature of 1200℃. However, this method of directly heating the threaded pipe with resistance wires resulted in low heat exchange and did not meet the requirements for large-flow kerosene production.

[0010] Currently, supercritical kerosene pretreatment systems are mainly designed for small-flow kerosene, and existing designs cannot meet the requirements of large flow rates. The main heating methods are gas generator heating and electric heating, but both methods are difficult to control the kerosene outlet temperature. Using a single-stage heating method, the kerosene stays in the high-temperature region for a long time, which easily leads to coking problems.

[0011] In summary, the disadvantages of existing supercritical kerosene pretreatment systems are as follows: 1. The flow rate is too low to meet the needs of actual engineering applications.

[0012] 2. Combustion heating makes it difficult to precisely control the temperature of kerosene.

[0013] 3. Kerosene is prone to coking when exposed to high temperatures for extended periods.

[0014] 4. Electric heating consumes a large amount of electricity and has high power supply requirements.

[0015] 5. The heater is located under high temperature and pressure, which is quite dangerous.

[0016] Therefore, how to solve the above problems has become a research focus for those skilled in the art. Summary of the Invention

[0017] The purpose of this invention is to provide a supercritical kerosene pretreatment system to achieve precise temperature control of large-flow kerosene.

[0018] To address the aforementioned technical problems, this invention provides a supercritical kerosene pretreatment system, comprising a high-pressure gas source, a primary heater, a secondary heater, and a detection and supply device connected sequentially. The high-pressure gas source outputs high-pressure gas to the primary heater. The primary heater includes an insulated oil storage tank and a heating element. The input end of the insulated oil storage tank is connected to the outlet end of the high-pressure gas source, and the output end of the insulated oil storage tank is connected to the input end of the secondary heater. The heating element heats the temperature inside the insulated oil storage tank to below the coking temperature of the kerosene. The secondary heater utilizes molten salt for heat exchange heating. The detection and supply device includes a standard delivery pipeline and a non-standard delivery pipeline with opposite open / closed states. When the detection and supply device detects that the kerosene temperature output from the secondary heater meets the standard, it controls the standard delivery pipeline to output kerosene; conversely, it controls the non-standard delivery pipeline to output kerosene.

[0019] In one embodiment, the high-pressure gas source includes a high-pressure gas cylinder and a gas source pressure reducing valve; the outlet of the high-pressure gas cylinder is connected to the input of the gas source pressure reducing valve; and the output of the gas source pressure reducing valve is connected to the input of the insulated oil storage tank.

[0020] In one embodiment, the heating element is used to heat the temperature inside the insulated oil storage tank to 190°C-210°C.

[0021] In one embodiment, the heating element is an electric blanket, which is wrapped around the insulated oil storage tank.

[0022] In one embodiment, a filter, a high-temperature ball valve, a flow meter, and a kerosene check valve are sequentially installed on the passage connecting the insulated oil storage tank and the secondary heater; the insulated oil storage tank is connected to a temperature and pressure detection device, which is used to monitor the internal temperature and pressure of the insulated oil storage tank.

[0023] In one embodiment, the secondary heater includes a heating kiln, a molten salt storage container, and a spiral tube; the heating kiln surrounds the molten salt storage container and is used to heat the internal temperature of the molten salt storage container to a set value; the molten salt storage container is filled with molten salt; the spiral tube is immersed in the molten salt, the input end of the spiral tube is connected to the output end of the heat-insulating oil storage tank, and the output end of the spiral tube is connected to the input end of the detection and supply device.

[0024] In one embodiment, the detection supply device further includes a control pipeline, the input end of which is connected to the output end of the secondary heater, and the output end of which is connected to the compliant delivery pipeline and the non-standard delivery pipeline, respectively. The control pipeline is provided with a pressure sensor and a temperature sensor arranged sequentially along its delivery direction.

[0025] In one embodiment, the compliant delivery pipeline is provided with a first ball valve and a temperature compensation section arranged sequentially along its delivery direction, the temperature compensation section being a pipe section with heating regulation function; the non-standard delivery pipeline is provided with a second ball valve and a condenser arranged sequentially along its delivery direction.

[0026] In one embodiment, the input end of the secondary heater is connected to a purging device for purging residues within the secondary heater.

[0027] In one embodiment, the purging device includes a nitrogen cylinder, a purging pressure reducing valve, and a purging check valve; the outlet of the nitrogen cylinder is connected to the input of the purging pressure reducing valve; the output of the purging pressure reducing valve is connected to the input of the purging check valve; and the output of the purging check valve is connected to the input of the secondary heater.

[0028] The beneficial effects of this invention are as follows: 1. To achieve high-flow-rate kerosene heating, molten salt is used for heat storage. Molten salt has the advantages of high operating temperature and high specific heat capacity, and can be used as a heat exchange medium to achieve rapid heating of high-flow-rate kerosene.

[0029] For example, the initial crystallization / solidification temperature of binary solar molten salt is 245 / 220℃, and its usable temperature range is 260-600℃. Its specific heat capacity increases with temperature, which gradually enhances its heat storage capacity in the high-temperature range, making it suitable for energy storage in high-temperature environments.

[0030] Meanwhile, the secondary heater is internally equipped with spiral tubes, such as three spiral tubes with an outer diameter of 8mm and an inner diameter of 6mm, made of stainless steel. It can withstand pressures up to 20MPa at room temperature and up to 10MPa at high temperatures, meeting experimental requirements. Furthermore, the larger diameter of the spiral tubes effectively reduces kerosene flow losses, increases the contact area with the heat exchange medium, and enhances the heater's heat exchange capacity.

[0031] 2. To precisely control the kerosene temperature, a temperature compensation section at the outlet is used to precisely control the outlet temperature. Molten salt has a high specific heat capacity and a high convective heat transfer coefficient, resulting in minimal temperature changes during the experiment. Compared to heat exchange media such as graphite sand, molten salt is liquid with low viscosity and good fluidity, leading to more uniform heat distribution and eliminating localized overheating or undercooling during the experiment. During the experiment, the kerosene outlet temperature will slightly decrease over time, becoming slightly lower than the molten salt temperature. At this point, the temperature compensation section at the outlet regulates the kerosene temperature, achieving precise temperature control. When the temperature does not meet the experimental requirements, the kerosene is cooled by a condenser before being discharged. Once the required temperature is reached, the oil circuit is switched to ensure that the kerosene entering the engine reaches the required temperature.

[0032] 3. To reduce coking products, a two-stage heating system is employed. For example, the primary heater first heats the kerosene to 200°C using an insulated oil storage tank and maintains this temperature. This temperature is below the kerosene coking temperature and falls within the normal operating temperature range of the flow meter. The secondary heater uses molten salt heat exchange for rapid heating, ensuring the kerosene flows through the heat exchanger for less than 3 seconds. This reduces the time the kerosene spends in the high-temperature region, preventing excessive coking products from forming before the kerosene is discharged from the heater. To prevent coking products from damaging the experimental specimens, a filter is installed between the primary and secondary heaters to remove coking products. After the experiment, the secondary heater is immediately purged using a purging device to prevent residual kerosene from coking and clogging the heat exchanger.

[0033] 4. To reduce instantaneous power consumption and equipment power requirements, molten salt is used as a heat storage medium to heat kerosene, eliminating the need for high-power electrical energy during experiments. The heat storage medium has a high specific heat capacity, allowing for multiple experiments to be conducted in a short period after reaching the target temperature.

[0034] 5. To reduce the operational risks of the kerosene heater and minimize the requirements for equipment pressure resistance and thermal protection, molten salt at atmospheric pressure is used as the heat exchange medium. During operation, it experiences localized high temperature and pressure without the need for high-voltage electricity, ensuring good safety and stability. After the experiment, the heater is purged with high-pressure nitrogen to prevent kerosene ignition. The spiral tube inside the secondary heater is made of 8mm stainless steel, offering high strength, and is connected using welding technology, eliminating the risk of leakage.

[0035] 6. Electric blankets and heating kilns are commonly used heat exchange systems in industry, with mature technology, low failure rate, and low cost. Molten salt, as a widely used heat exchange medium, has excellent performance and strong plasticity. Attached Figure Description

[0036] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure provided in an embodiment of the present invention; Figure 2 This is an experimental data graph provided in an embodiment of the present invention.

[0038] The attached figures are labeled as follows: 100. High-pressure gas source; 110. High-pressure gas cylinder; 120. Gas source pressure reducing valve; 200. Primary heater; 210. Insulated oil storage tank; 220. Heating element; 230. Temperature and pressure detection device; 240. Filter; 250. High-temperature ball valve; 260. Flow meter; 270. Kerosene check valve; 300. Secondary heater; 310. Heating kiln; 320. Molten salt storage container; 330. Spiral tube; 400. Testing and supply device; 410. Standard delivery pipeline; 411. First ball valve; 412. Temperature compensation section; 420. Non-standard delivery pipeline; 421. Second ball valve; 422. Condenser; 430. Monitoring and control pipeline; 431. Pressure sensor; 432. Temperature sensor; 500. Purge device; 510. Nitrogen cylinder; 520. Purge pressure reducing valve; 530. Purge check valve. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0040] This invention provides a supercritical kerosene pretreatment system, such as... Figure 1 As shown, it includes a high-pressure gas source 100, a primary heater 200, a secondary heater 300, and a detection and supply device 400, which are connected in sequence.

[0041] Regarding the high-pressure gas source 100, as follows: Figure 1 As shown, in this embodiment, the high-pressure gas source 100 is configured to output high-pressure gas to the primary heater 200. At this time, the high-pressure gas source 100 includes a high-pressure gas cylinder 110 and a gas source pressure reducing valve 120. The outlet of the high-pressure gas cylinder 110 is connected to the input of the gas source pressure reducing valve 120. The output of the gas source pressure reducing valve 120 is connected to the input of the heat-insulating oil storage tank 210 of the primary heater 200.

[0042] After adopting the above setting method, the high-pressure gas stored in the high-pressure gas cylinder 110 can be reduced by the gas source pressure reducing valve 120, so that the pressure of the high-pressure gas can meet the application requirements, thus ensuring the pressure stability of the first-stage heater 200.

[0043] Regarding the primary heater 200, as Figure 1 As shown, in this embodiment, the primary heater 200 includes an insulated oil storage tank 210 and a heating element 220; the input end of the insulated oil storage tank 210 is connected to the outlet end of the high-pressure gas source 100, and the output end of the insulated oil storage tank 210 is connected to the input end of the secondary heater 300; the heating element 220 is used to heat the temperature inside the insulated oil storage tank 210 to below the coking temperature of kerosene.

[0044] In this embodiment, the insulated oil storage tank 210 is a cylindrical iron tank. The insulated oil storage tank 210 is connected to a temperature and pressure detection device 230, which is used to monitor the internal temperature and pressure of the insulated oil storage tank 210.

[0045] Furthermore, the insulated oil storage tank 210 is not directly connected to the secondary heater 300, such as... Figure 1 As shown, at this time, the passage connecting the insulated oil storage tank 210 and the secondary heater 300 is equipped with a filter 240, a high-temperature ball valve 250, a flow meter 260 and a kerosene check valve 270 in sequence.

[0046] The aforementioned filter 240 can be used to filter impurities in kerosene, preventing coking and damage to downstream equipment. Furthermore, the filter 240 can use a removable metal filter element, which not only meets the filtration requirements under high temperature and high pressure, but is also easy to replace.

[0047] The high-temperature ball valve 250 mentioned above is located after the filter 240. It needs to be ensured that it can still work normally under high temperature conditions, such as being able to start and stop normally at 200℃.

[0048] The flow meter 260 mentioned above is located after the high-temperature ball valve 250. The flow meter 260 can be a Coriolis mass flow meter to ensure that it can still work normally at a specific temperature, such as below 260°C.

[0049] The aforementioned kerosene check valve 270 is located between the flow meter 260 and the secondary heater 300 to prevent kerosene backflow from damaging the flow meter 260.

[0050] It should also be noted that, in order to reduce heat loss from the insulated oil storage tank 210, an insulation layer can be covered on the outside of the insulated oil storage tank 210.

[0051] In addition, the heating element 220 in this embodiment is used to heat the temperature inside the insulated oil storage tank 210 to below the coking temperature of kerosene. The selection criteria are to maximize the first heating temperature and ensure that coking is avoided. For example, it is preferable to set the heating element 220 to heat the temperature inside the insulated oil storage tank 210 to 190°C-210°C. Specifically, in this embodiment, the heating temperature is set to 200°C.

[0052] It should be noted that there are many options for the heating element 220, but in this embodiment, the heating element 220 is set as an electric blanket and wrapped around the heat-insulating oil storage tank 210. Its advantages are that the process is mature, the failure rate is low, and the cost is low.

[0053] Regarding the secondary heater 300, as Figure 1 As shown, in this embodiment, the secondary heater 300 is configured to use molten salt for heat exchange heating. Specifically, the secondary heater 300 includes a heating furnace 310, a molten salt storage container 320, and a spiral tube 330. The heating furnace 310 surrounds the molten salt storage container 320 and is used to heat the internal temperature of the molten salt storage container 320 to a set value. The molten salt storage container 320 is filled with molten salt. The spiral tube 330 is immersed in the molten salt, and the input end of the spiral tube 330 is connected to the output end of the heat-insulating oil storage tank 210, while the output end of the spiral tube 330 is connected to the input end of the detection and supply device 400.

[0054] The aforementioned heating kiln 310 is heated by electric heating wires and is covered with heat insulation material, which enables precise temperature control. Furthermore, the inner and outer walls of the heating kiln 310 are equipped with K-type thermocouples with a range of 0-1300℃ and an accuracy of ±1℃.

[0055] The aforementioned molten salt storage container 320 is made of 2mm thick stainless steel to enclose the internal molten salt. The molten salt storage container 320 has an opening to release internal pressure.

[0056] The aforementioned molten salt is a binary molten salt, which can achieve temperature regulation from 240℃ to 550℃. It also has the advantages of high operating temperature, high thermal stability, high specific heat capacity, high convective heat transfer coefficient, low viscosity, low saturated vapor pressure, and low price, and can meet the heat exchange requirements under high flow rate.

[0057] The spiral tube 330 has an outer diameter of 8 mm and an inner diameter of 6 mm. It can guarantee strength and heat exchange requirements under 550℃ conditions, and the number of spiral tubes can be selected according to requirements. For example, in this embodiment, the spiral tube 330 is set to three layers.

[0058] like Figure 1As shown, this embodiment also has a purging device 500 connected to the input end of the secondary heater 300, which is used to remove residues inside the secondary heater 300.

[0059] Specifically, the purging device 500 includes a nitrogen cylinder 510, a purging pressure reducing valve 520, and a purging check valve 530; the outlet of the nitrogen cylinder 510 is connected to the input of the purging pressure reducing valve 520; the output of the purging pressure reducing valve 520 is connected to the input of the purging check valve 530; and the output of the purging check valve 530 is connected to the input of the secondary heater 300.

[0060] During application, nitrogen cylinder 510 is used to provide the high-pressure gas required for purging. The purging pressure is maintained at about 2.5 MPa through purging pressure reducing valve 520. The opening and closing of the purging ball valve is controlled by a program. Nitrogen gas is used for purging immediately after the experiment, and then enters the secondary heater 300 through purging check valve 530 to prevent hot kerosene from flowing back to the purging device 500.

[0061] Regarding the aforementioned detection supply device 400, such as Figure 1 As shown, in this embodiment, the detection and supply device 400 includes a standard delivery pipeline 410 and a non-standard delivery pipeline 420 with opposite open and closed states. When the detection and supply device 400 detects that the kerosene temperature output by the secondary heater 300 meets the standard, it controls the standard delivery pipeline 410 to output kerosene; otherwise, it controls the non-standard delivery pipeline 420 to output kerosene.

[0062] Specifically, the detection supply device 400 at this time also includes a detection and control pipeline 430. The input end of the detection and control pipeline 430 is connected to the output end of the secondary heater 300. The output end of the detection and control pipeline 430 is connected to the compliant delivery pipeline 410 and the non-standard delivery pipeline 420 respectively. The detection and control pipeline 430 is equipped with a pressure sensor 431 and a temperature sensor 432 arranged sequentially along its delivery direction.

[0063] Furthermore, a flange 433 is installed after the temperature sensor 432. Orifice plates with different apertures can be installed inside the flange 433, and flow control can be achieved by the upstream pressure of the orifice plate.

[0064] The aforementioned compliant delivery pipeline 410 is equipped with a first ball valve 411 and a temperature compensation section 412 arranged sequentially along its delivery direction. The temperature compensation section 412 is a pipe section with heating and regulation functions. At this time, the temperature compensation section 412 is essentially a pipeline structure, and a corresponding heating structure is set on the pipe wall to achieve kerosene temperature compensation by heating.

[0065] The aforementioned non-standard conveying pipeline 420 is equipped with a second ball valve 421 and a condenser 422 arranged sequentially along its conveying direction.

[0066] In this embodiment, the first ball valve 411 is normally closed, and the second ball valve 421 is normally open, controlled by the same relay to achieve simultaneous opening and closing. When the kerosene parameters measured by various sensors are substandard, the second ball valve 421 opens, and the kerosene is discharged after being cooled by the condenser 422. When the kerosene parameters measured by various sensors are up to standard, the first ball valve 411 opens, and the kerosene enters the engine through the temperature compensation section 412, completing the experiment.

[0067] Finally, from Figure 2 It can be seen that this embodiment can achieve kerosene supply at temperatures of 300-800℃, pressures of 1-5 MPa, and flow rates of 0-500 g / s.

[0068] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A supercritical kerosene pretreatment system, characterized in that, It includes a high-pressure gas source, a primary heater, a secondary heater, and a detection and supply device that are connected in sequence. The high-pressure gas source is used to output high-pressure gas to the first-stage heater; The primary heater includes an insulated oil storage tank and a heating element; the input end of the insulated oil storage tank is connected to the outlet end of the high-pressure gas source, and the output end of the insulated oil storage tank is connected to the input end of the secondary heater; the heating element is used to heat the temperature inside the insulated oil storage tank to below the coking temperature of kerosene. The secondary heater is a structure that uses molten salt for heat exchange heating; The detection and supply device includes a standard delivery pipeline and a non-standard delivery pipeline with opposite open and closed states; when the detection and supply device detects that the kerosene temperature output by the secondary heater meets the standard, it controls the standard delivery pipeline to output kerosene, and vice versa.

2. The supercritical kerosene pretreatment system according to claim 1, characterized in that, The high-pressure gas source includes a high-pressure gas cylinder and a gas source pressure reducing valve; The outlet of the high-pressure gas cylinder is connected to the input of the gas source pressure reducing valve; The output end of the gas source pressure reducing valve is connected to the input end of the insulated oil storage tank.

3. The supercritical kerosene pretreatment system according to claim 1, characterized in that, The heating element is used to heat the temperature inside the insulated oil storage tank to 190℃-210℃.

4. The supercritical kerosene pretreatment system according to claim 1, characterized in that, The heating element is an electric blanket, which is wrapped around the insulated oil storage tank.

5. The supercritical kerosene pretreatment system according to claim 1, characterized in that, The passage connecting the insulated oil storage tank and the secondary heater is sequentially equipped with a filter, a high-temperature ball valve, a flow meter, and a kerosene check valve. The insulated oil storage tank is connected to a temperature and pressure detection device, which is used to monitor the internal temperature and pressure of the insulated oil storage tank.

6. The supercritical kerosene pretreatment system according to claim 1, characterized in that, The secondary heater includes a heating kiln, a molten salt storage container, and a spiral tube; The heating furnace surrounds the molten salt storage container, and the heating furnace is used to heat the internal temperature of the molten salt storage container to a set value. The molten salt storage container is filled with molten salt. The spiral tube is immersed in the molten salt, the input end of the spiral tube is connected to the output end of the insulated oil storage tank, and the output end of the spiral tube is connected to the input end of the detection and supply device.

7. The supercritical kerosene pretreatment system according to claim 1, characterized in that, The testing and supply device also includes a control pipeline, the input end of which is connected to the output end of the secondary heater, and the output end of which is connected to the compliant delivery pipeline and the non-standard delivery pipeline respectively. The control pipeline is equipped with a pressure sensor and a temperature sensor arranged sequentially along its delivery direction.

8. The supercritical kerosene pretreatment system according to claim 1, characterized in that, The compliant delivery pipeline is equipped with a first ball valve and a temperature compensation section arranged sequentially along its delivery direction. The temperature compensation section is a pipe section with heating and regulation functions. The non-standard delivery pipeline is equipped with a second ball valve and a condenser arranged sequentially along its delivery direction.

9. The supercritical kerosene pretreatment system according to claim 1, characterized in that, The input end of the secondary heater is connected to a purging device, which is used to remove residues inside the secondary heater.

10. The supercritical kerosene pretreatment system according to claim 1, characterized in that, The purging device includes a nitrogen cylinder, a purging pressure reducing valve, and a purging check valve; The outlet of the nitrogen cylinder is connected to the input of the purging and pressure reducing valve; The output end of the purge pressure reducing valve is connected to the input end of the purge check valve; The output end of the purge check valve is connected to the input end of the secondary heater.

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