System for accelerating deterioration of diesel storage state and method for preparing deteriorated diesel

Abstract

The application provides a system for accelerating deterioration of diesel oil in a storage state and a method for preparing deteriorated diesel oil, and relates to the technical field of fuel property detection for internal combustion engines. The system for accelerating deterioration of diesel oil in a storage state comprises a reaction kettle, an internal space of the reaction kettle is formed as a containing cavity, the containing cavity is configured to contain diesel oil, a catalyst wire mesh is installed at the upper part of the reaction kettle and located in the containing cavity, and is suitable for accelerating the speed of the deterioration reaction of the diesel oil; and a supply unit is configured to respectively supply oxygen and inert gas to the containing cavity according to preset delivery pressure and delivery flow rate, the oxygen is suitable for the deterioration reaction with the diesel oil in the atmosphere of the inert gas, and the time for preparing the deteriorated diesel oil can be shortened.

Description

Technical Field

[0001] This invention relates to the technical field of fuel characteristic testing for internal combustion engines, and more specifically, to a system for accelerating the deterioration of diesel fuel storage conditions and a method for preparing deteriorated diesel fuel. Background Technology

[0002] Compression-ignition internal combustion engines (diesel engines) that run on diesel fuel are widely used in medium and heavy-duty passenger and freight vehicles or off-road construction machinery due to their advantages such as high thermal efficiency, strong power, and durability. However, before diesel fuel is added to diesel vehicles or construction machinery, it needs to undergo a storage and transportation process, and some diesel fuel may undergo this process for a long time. For example, the standby diesel generator sets in nuclear power plants are in a standby state for a long time due to the high reliability of nuclear power units, and the diesel fuel in their tanks is difficult to consume even after many years. As a complex mixture of hydrocarbon organic compounds, even under good storage conditions, with the extension of storage time, the unsaturated bonds in components such as alkenes and alkynes in diesel fuel gradually react with oxidants to undergo oxidation-oligopolymerization reactions, resulting in the continuous generation of various impurities such as gums. Under the influence of different impurities, the viscosity, rheological properties, distillation range, and other physicochemical properties and combustion reaction characteristics of diesel fuel deteriorate, causing the performance of diesel engines that run on this deteriorated diesel fuel to deteriorate in terms of power output and combustion stability.

[0003] When the quality of diesel fuel deteriorates to the point where it is detrimental to the operating condition of a diesel engine, it needs to be replaced. Determining whether long-term stored diesel fuel has become ineffective requires establishing a method for judging when to replace it. Changes in certain physicochemical and combustion characteristics of diesel fuel after deterioration can serve as a basis for judging whether long-term stored diesel fuel has become ineffective. However, diesel engine tests are needed on samples of long-term stored diesel fuel with different degrees of deterioration to calibrate the limits of these physicochemical and combustion characteristics in determining the timing of fuel replacement and to verify the reliability of the method for judging the timing of fuel replacement. Diesel fuel samples with different degrees of deterioration under specific storage conditions are simply diesel fuel samples stored for different durations under specific storage conditions. However, under normal storage conditions, diesel fuel needs to be stored for several years or even decades before it deteriorates to the point where it is detrimental to the combustion condition of a diesel engine. Therefore, simply relying on extending the storage time to prepare diesel fuel samples with different degrees of deterioration requires too much time and cannot meet the requirements of oil performance evaluation technology for diesel fuel sample preparation time. Summary of the Invention

[0004] To address at least one of the technical problems in the prior art, embodiments of the present invention provide a system for accelerating the deterioration of diesel storage conditions and a method for preparing deteriorated diesel, which can shorten the time required to prepare deteriorated diesel.

[0005] The present invention provides a system for accelerating the deterioration of diesel fuel storage conditions, comprising: a reaction vessel, the interior of which forms a containment cavity configured to contain diesel fuel; a catalyst mesh installed on the upper part of the reaction vessel and located within the containment cavity, suitable for accelerating the deterioration reaction rate of the diesel fuel; and a supply unit configured to supply oxygen and an inert gas into the containment cavity according to a preset supply pressure and supply flow rate, wherein the oxygen is suitable for reacting with the diesel fuel in the atmosphere of the inert gas to induce a deterioration reaction.

[0006] Optionally, the above-mentioned reactor includes: a body; a cover body, which is disposed on the body body, and a groove is formed radially on the cover body, and one end of the catalyst mesh is installed in the groove, such that the catalyst mesh is at least partially immersed in the diesel oil.

[0007] Optionally, the supply unit includes: an oxygen supply mechanism configured to supply oxygen to the containment cavity according to a first supply pressure and a first supply flow rate; an inert gas supply mechanism configured to supply inert gas to the containment cavity according to a second supply pressure and a second supply flow rate, wherein the second supply pressure is the same as the first supply pressure and the second supply flow rate is not less than the first supply flow rate; and a gas check valve, wherein the inlet of the gas check valve is connected to the output end of the oxygen supply mechanism and the output end of the inert gas supply mechanism, and the outlet of the gas check valve is connected to the inlet end of the reactor to prevent the oxygen and inert gas supplied to the containment cavity from flowing back.

[0008] Optionally, the system for accelerating the deterioration of diesel storage conditions further includes: a heating jacket fitted over the outside of the main body to heat the diesel fuel in the receiving cavity using the main body; and a temperature controller electrically connected to the heating jacket and configured to adjust the heating temperature of the heating jacket.

[0009] Optionally, the system for accelerating the deterioration of diesel fuel storage conditions further includes: a stirring sub-body disposed at the bottom of the aforementioned containment cavity; a plurality of magnetic blocks installed at the ends of the stirring sub-body; and a magnetic actuator disposed on the outside of the aforementioned reactor, configured to change the polarity of the two ends of the magnetic actuator by means of an external power supply device, and to drive the stirring sub-body to rotate axially around the aforementioned containment cavity by means of the magnetic force between the two ends of the magnetic actuator and the plurality of magnetic blocks, so as to stir the aforementioned diesel fuel.

[0010] According to another aspect of the present invention, a method for preparing degraded diesel fuel using the above-described system for accelerating the deterioration of diesel fuel storage conditions is also provided, comprising: injecting diesel fuel into a containment cavity of a reactor equipped with a catalyst mesh; adjusting an oxygen supply mechanism to supply oxygen into the containment cavity at a first delivery pressure and a first delivery flow rate, while simultaneously adjusting an inert gas supply mechanism to supply inert gas into the containment cavity at a second delivery pressure and a second delivery flow rate, wherein the second delivery pressure is the same as the first delivery pressure and the second delivery flow rate is not less than the first delivery flow rate; adjusting the temperature of a heating jacket fitted outside the reactor using a temperature controller; and stirring the diesel fuel in the containment cavity by a magnetic actuator, thereby causing the diesel fuel to undergo a deterioration reaction to obtain degraded diesel fuel, wherein the deterioration reaction time is 50h to 200h.

[0011] Optionally, the catalyst mesh is made of platinum or palladium, and the density of the catalyst mesh is 20 mesh to 80 mesh.

[0012] Optionally, the first conveying pressure and the second conveying pressure are 0.2MPa to 2MPa, and the second conveying flow rate is 1 to 10 times the first conveying flow rate.

[0013] Optionally, the temperature of the heating jacket is 50℃~100℃.

[0014] Optionally, the rotational speed of the above-mentioned stirrer body is 5 r / s to 50 r / s.

[0015] According to an embodiment of the present invention, a system for accelerating the deterioration of diesel fuel storage conditions and a method for preparing deteriorated diesel fuel are provided. A containment cavity is formed inside a reaction vessel, configured to contain diesel fuel. A catalyst mesh is installed on the upper part of the reaction vessel and located within the containment cavity. The catalyst mesh is suitable for accelerating the deterioration reaction of diesel fuel. A supply unit is configured to supply oxygen and inert gas to the containment cavity according to preset delivery pressure and delivery flow rate, respectively. Oxygen is suitable for reacting with diesel fuel in an inert gas atmosphere to accelerate the deterioration reaction. Increasing the oxygen content in the diesel fuel can accelerate the deterioration reaction. Simultaneously, by combining the catalyst mesh with the accelerated deterioration reaction, the time required to prepare deteriorated diesel fuel can be shortened. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of a system for accelerating the deterioration of diesel storage conditions according to an embodiment of the present invention;

[0017] Figure 2 This is a side view of a catalyst mesh according to an embodiment of the present invention;

[0018] Figure 3This is a flowchart of a method for preparing degraded diesel fuel according to an embodiment of the present invention.

[0019] In the accompanying drawings, the meanings of the reference numerals are as follows:

[0020] 1. Reactor;

[0021] 10. Ontology;

[0022] 11. Cover;

[0023] 110. Groove;

[0024] 12. Receiving cavity;

[0025] 13. Sealing gasket;

[0026] 14. Fasteners;

[0027] 15. Air intake end;

[0028] 16. Exhaust end;

[0029] 2. Catalyst mesh;

[0030] 20. Supporting framework;

[0031] 21. Precious metal wire;

[0032] 3. Supply unit;

[0033] 30. Oxygen supply facilities;

[0034] 300. Oxygen source;

[0035] 301. First pressure reducing valve;

[0036] 302. First flow meter;

[0037] 31. Inert gas supply mechanism;

[0038] 310. Inert gas source;

[0039] 311. Second pressure reducing valve;

[0040] 312. Second flow meter;

[0041] 32. Gas check valve;

[0042] 33. T-connector;

[0043] 4. Heating jacket;

[0044] 5. Temperature controller;

[0045] 6. Stirrer body;

[0046] 7. Magnetic actuator;

[0047] 8. Gas-liquid separator;

[0048] 9. Gas vent. Detailed Implementation

[0049] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the invention for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0050] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0051] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0052] When using expressions such as "at least one of A, B, and C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.). When using expressions such as "at least one of A, B, or C," the expression should generally be interpreted in accordance with the meaning commonly understood by a person skilled in the art (e.g., "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.).

[0053] To meet the requirements of diesel sample preparation time in oil performance evaluation technology, according to one aspect of the invention, a containment cavity is formed inside the reaction vessel to contain diesel fuel. A catalyst mesh is installed on the upper part of the reaction vessel and located inside the containment cavity. The catalyst mesh is suitable for accelerating the degradation reaction of diesel fuel. The supply unit is configured to supply oxygen and inert gas into the containment cavity according to a preset delivery pressure and delivery flow rate, respectively. Oxygen is suitable for reacting with diesel fuel in an inert gas atmosphere to accelerate the degradation reaction. Increasing the oxygen content in the diesel fuel can accelerate the degradation reaction. At the same time, combined with the catalyst mesh accelerating the degradation reaction, the time for preparing degraded diesel fuel can be shortened.

[0054] Figure 1 This is a cross-sectional view of a system for accelerating the deterioration of diesel storage conditions according to an embodiment of the present invention.

[0055] According to embodiments of the present invention, a system for accelerating the deterioration of diesel fuel storage conditions is provided, such as... Figure 1 As shown, the system includes a reaction vessel 1, a catalyst mesh 2, and a supply unit 3. The interior of the reaction vessel 1 forms a receiving cavity 12, which is configured to contain diesel fuel. The catalyst mesh 2 is installed on the upper part of the reaction vessel 1 and located within the receiving cavity 12. The catalyst mesh 2 is designed to accelerate the degradation reaction of the diesel fuel. The supply unit 3 is configured to supply oxygen and inert gas to the receiving cavity 12 according to preset delivery pressure and flow rate. The oxygen is suitable for reacting with the diesel fuel in an inert gas atmosphere to induce a degradation reaction.

[0056] Figure 2 This is a side view of a catalyst mesh according to an embodiment of the present invention.

[0057] According to embodiments of the present invention, such as Figure 2 As shown, the catalyst mesh 2 includes a support frame 20 and multiple precious metal wires 21. A portion of the multiple precious metal wires 21 are arranged parallel to each other at intervals along a first direction within the support frame 20, and another portion of the multiple precious metal wires 21 are arranged parallel to each other at intervals along a second direction within the support frame 20. The first direction and the second direction form an angle. included angle The range is 20° to 150°. For example, the included angle can be 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140°, or 150°.

[0058] According to an embodiment of the present invention, the material of the support frame 20 may be metal.

[0059] According to an embodiment of the present invention, a containment cavity 12 is formed inside the reactor 1. The containment cavity 12 is configured to contain diesel fuel. A catalyst mesh 2 is installed on the upper part of the reactor 1 and located inside the containment cavity 12. The catalyst mesh 2 is suitable for accelerating the degradation reaction of diesel fuel. The supply unit 3 is configured to supply oxygen and inert gas into the containment cavity 12 according to a preset delivery pressure and delivery flow rate. Oxygen is suitable for reacting with diesel fuel in an inert gas atmosphere to accelerate the degradation reaction of diesel fuel. Increasing the oxygen content in diesel fuel can accelerate the degradation reaction of diesel fuel. At the same time, combined with the catalyst mesh 2 to accelerate the degradation reaction of diesel fuel, the time for preparing degraded diesel fuel can be shortened.

[0060] According to an embodiment of the present invention, the reactor 1 includes a body 10 and a cover 11. The cover 11 is disposed on the body 10, and a groove 110 is formed radially on the cover 11. One end of the catalyst mesh 2 is installed in the groove 110, such that the catalyst mesh 2 is at least partially immersed in diesel oil.

[0061] According to an embodiment of the present invention, the receiving cavity 12 is constructed as a column, and a groove 110 is provided on the side of the cover 11 facing the receiving cavity 12, and an exhaust end 16 of the reaction vessel 1 is provided on the other side of the cover 11 away from the receiving cavity 12. The groove 110 is opened radially along the cover 11, and the length of the groove 110 is the same as the inner diameter of the receiving cavity 12, and the width of the groove 110 is the same as the thickness of the support frame 20.

[0062] In one illustrative embodiment, the depth of the groove 110 is the same as the width d of the support frame 20.

[0063] According to an embodiment of the present invention, the thickness of the support frame 20 is 3mm to 5mm, and the width d of the support frame 20 is 2mm to 4mm.

[0064] According to an embodiment of the present invention, the reactor 1 further includes a sealing gasket 13, which is disposed between the body 10 and the cover 11 to ensure the sealing of the diesel fuel in the containment cavity 12 when a deterioration reaction occurs.

[0065] According to an embodiment of the present invention, a flange portion is formed on the side of the body 10 near the cover 11, extending radially outward along the body 10. A plurality of first through holes are spaced apart on the flange portion. A plurality of second through holes are respectively formed on the cover 11 at positions facing the plurality of first through holes on the flange portion, allowing the fasteners 14 to pass through. The cover 11, the sealing gasket 13, and the body 10 are fixed together by the plurality of fasteners 14, which may be, for example, bolts.

[0066] According to an embodiment of the present invention, the system for accelerating the deterioration of diesel fuel storage conditions further includes a gas-liquid separator 8. The inlet of the gas-liquid separator 8 is connected to the exhaust end 16 of the reaction vessel 1. The deteriorated diesel fuel separated by the gas-liquid separation is stored at the bottom of the gas-liquid separator 8. After the deteriorated diesel fuel preparation process is completed, the deteriorated diesel fuel stored in the gas-liquid separator 8 is poured into a waste liquid tank, while the oxygen and inert gas separated by the gas-liquid separation are connected to the gas vent 9 through the gas outlet of the gas-liquid separator 8. The gas-liquid separator 8 is suitable for preventing the diesel fuel (especially the light components in the diesel fuel) in the containment chamber 12 from being carried away by the oxygen and inert gas remaining from the deterioration reaction and released into the atmosphere through the gas vent 9, thus polluting the environment.

[0067] According to an embodiment of the present invention, the supply unit 3 includes an oxygen supply mechanism 30, an inert gas supply mechanism 31, and a gas check valve 32. The oxygen supply mechanism 30 is configured to supply oxygen to the receiving cavity 12 at a first supply pressure and a first supply flow rate. The inert gas supply mechanism 31 is configured to supply inert gas to the receiving cavity 12 at a second supply pressure and a second supply flow rate, wherein the second supply pressure is the same as the first supply pressure, and the second supply flow rate is not less than the first supply flow rate. The inlet of the gas check valve 32 is connected to the output ends of the oxygen supply mechanism 30 and the inert gas supply mechanism 31, and the outlet of the gas check valve 32 is connected to the inlet end 15 of the reaction vessel 1 to prevent the backflow of oxygen and inert gas supplied to the receiving cavity 12.

[0068] According to an embodiment of the present invention, the oxygen supply mechanism 30 includes an oxygen source 300, a first pressure reducing valve 301, and a first flow meter 302. The oxygen source 300 is configured to supply oxygen. A first port of the first pressure reducing valve 301 is connected to the outlet of the oxygen source 300, and a second port of the first pressure reducing valve 301 is connected to the inlet of the first flow meter 302. The first pressure reducing valve 301 is adapted to reduce the pressure of the oxygen from the oxygen source 300, so that the oxygen is delivered into the receiving cavity 12 at a first delivery pressure. The first flow meter 302 is adapted to regulate the delivery flow rate of the oxygen delivered to the receiving cavity 12, so that the oxygen is delivered into the receiving cavity 12 at the first delivery flow rate.

[0069] According to an embodiment of the present invention, the inert gas supply mechanism 31 includes an inert gas source 310, a second pressure reducing valve 311, and a second flow meter 312. The inert gas source 310 is configured to provide inert gas. A third port of the second pressure reducing valve 311 is connected to the outlet of the inert gas source 310, and a fourth port of the second pressure reducing valve 311 is connected to the inlet of the second flow meter 312. The second pressure reducing valve 311 is adapted to reduce the pressure of the inert gas from the inert gas source 310, so that the inert gas is delivered into the receiving cavity 12 at a second delivery pressure. The second flow meter 312 is adapted to regulate the delivery flow rate of the inert gas to the receiving cavity 12, so that the inert gas is delivered into the receiving cavity 12 at a second delivery flow rate. The second delivery pressure is the same as the first delivery pressure, and the second delivery flow rate is not less than the first delivery flow rate.

[0070] According to an embodiment of the present invention, the supply unit 3 further includes a three-way connector 33. The first air inlet of the three-way connector 33 is connected to the air outlet of the first flow meter 302, the second air inlet of the three-way connector 33 is connected to the air outlet of the second flow meter 312, and the air outlet of the three-way connector 33 is connected to the air inlet of the gas check valve 32. The three-way connector 33 can combine oxygen and inert gas and deliver them to the receiving cavity 12 of the reactor 1.

[0071] According to an embodiment of the present invention, the air inlet 15 of the reactor 1 is located at the bottom of the body 10. Oxygen and inert gas are mixed and transported to the receiving cavity 12 through the air inlet 15. The mixed oxygen and inert gas react with diesel fuel in an oxidation reaction, which is a crucial stage leading to diesel fuel degradation. Adding inert gas simulates the oxidation of diesel fuel in air, and also prevents excessively high oxygen concentrations, improving the safety of the oxidation reaction. Furthermore, adding inert gas to the oxygen pre-disperses the oxygen, increasing its dispersion in the diesel fuel. The dispersed oxygen forms smaller, faster-moving, and more uniformly dispersed oxygen bubbles in the diesel fuel.

[0072] According to an embodiment of the present invention, the system for accelerating the deterioration of diesel fuel storage conditions further includes a heating jacket 4 and a temperature controller 5. The heating jacket 4 is fitted over the outside of the body 10 to heat the diesel fuel within the receiving cavity 12 using the body 10. The temperature controller 5 is electrically connected to the heating jacket 4 and is configured to regulate the heating temperature of the heating jacket 4.

[0073] According to an embodiment of the present invention, the diesel fuel in the receiving cavity 12 can be heated by the heating jacket 4 using the body 10, thereby increasing the storage temperature of the diesel fuel.

[0074] According to an embodiment of the present invention, the system for accelerating the deterioration of diesel fuel storage conditions further includes a stirrer body 6, a plurality of magnetic blocks, and a magnetic actuator 7. The stirrer body 6 is disposed at the bottom of the receiving cavity 12. The plurality of magnetic blocks are mounted at the ends of the stirrer body 6. The magnetic actuator 7 is disposed on the outside of the reactor 1, and the magnetic actuator 7 is configured to change the polarity of its two ends by means of an external power supply. Utilizing the magnetic force between the two ends of the magnetic actuator 7 and the plurality of magnetic blocks, the stirrer body 6 is driven to rotate axially around the receiving cavity 12 to stir the diesel fuel and accelerate its flow.

[0075] According to an embodiment of the present invention, the magnetic force between the two ends of the magnetic actuator 7 and multiple magnetic blocks causes the stirring body 6 to overcome gravity and suspend above the bottom of the receiving cavity 12. The magnetic force drives the stirring body 6 to rotate around the axial direction of the receiving cavity 12 to stir the diesel fuel. During the stirring of the diesel fuel, the stirring body 6 can avoid contact with the bottom of the receiving cavity 12, and prevent wear between the stirring body 6 and the inner wall of the receiving cavity 12 due to rotation.

[0076] In one illustrative embodiment, each magnetic block comprises an iron block and fluororubber, with the iron block covered and encased in fluororubber. Fluororubber has good corrosion resistance and swelling resistance, and due to its high elasticity, it can cushion the impact when the stirrer body 6 comes into contact with the inner wall of the receiving cavity 12, and also protect the iron block from diesel corrosion.

[0077] According to an embodiment of the present invention, by changing the current of the external power supply device, the magnetic force between the two ends of the magnetic actuator 7 and the multiple magnetic blocks can be changed, thereby adjusting the rotation speed of the stirring body 6.

[0078] According to embodiments of the present invention, the core of the diesel fuel degradation process is the oxidation reaction of unsaturated bonds. Therefore, increasing the oxygen content in diesel fuel can accelerate the degradation reaction. Increasing the temperature of the degradation reaction can also accelerate the process. Under low-temperature conditions (below 100°C), the oxidation rate of unsaturated bonds can be increased by approximately two times for every 10°C increase in temperature. On the other hand, due to the limitations of mass transfer rate and catalytic activity in low-temperature liquid reaction systems, precious metal catalysts (precious metal wire 21) are generally used in gaseous catalytic reaction systems and liquid catalytic reaction systems under medium-high temperature conditions (above 150°C), but are almost never used in liquid catalytic reaction systems below 100°C. However, in order to simulate the low-speed reaction characteristics of the natural degradation process of diesel fuel, even in the process of forcibly accelerating the degradation reaction, the degradation rate of diesel fuel must be limited, requiring tens to hundreds of hours to complete the enhanced degradation process. Since excessively high mass transfer and catalytic reaction rates are not required, precious metal catalysts (precious metal wire 21) can also be used to further appropriately increase the degradation reaction rate of diesel fuel during the enhanced degradation process. Furthermore, appropriate stirring can further enhance the effects of measures such as increasing the storage temperature of diesel fuel, increasing the oxygen content in diesel fuel, and setting up catalyst mesh 2 to intensify the degradation reaction. Therefore, by adopting necessary intensification measures, the degradation reaction rate of diesel fuel molecules can be accelerated, enabling the rapid preparation of degraded diesel fuel samples.

[0079] Figure 3 This is a flowchart of a method for preparing degraded diesel fuel according to an embodiment of the present invention.

[0080] According to another embodiment of the present invention, a method for preparing degraded diesel fuel using the above-described system for accelerating the deterioration of diesel fuel storage conditions is provided, such as... Figure 1 , Figure 2 and Figure 3 As shown, it includes the following steps S1 to S4.

[0081] Step S1: Inject diesel fuel into the containment cavity 12 of the reactor 1, which is equipped with catalyst mesh 2.

[0082] According to an embodiment of the present invention, the length of the catalyst mesh 2 located in the receiving cavity 12 in the radial direction differs from the inner diameter of the receiving cavity 12 by 2 mm to 10 mm, and the distance between the lowest end of the catalyst mesh 2 located in the receiving cavity 12 and the bottom of the receiving cavity 12 is 2 to 5 times the diameter of the circle formed after the stirrer body 6 is rotated.

[0083] According to an embodiment of the present invention, the material of the catalyst mesh 2 is platinum (Pt) or palladium (Pd), and the density of the noble metal wires 21 of the catalyst mesh 2 is 20 mesh to 80 mesh.

[0084] According to an embodiment of the present invention, the density of the precious metal wire 21 can be 20 mesh, 40 mesh, 60 mesh, 80 mesh, or a range consisting of any two of the above values.

[0085] According to an embodiment of the present invention, the diameter of the noble metal wire 21 of the catalyst mesh 2 is 0.1 mm to 0.2 mm.

[0086] According to embodiments of the present invention, precious metal materials, represented by platinum and palladium, have a catalytic effect on the degradation reaction of hydrocarbon fuels, and the larger the contact area between the precious metal material and the hydrocarbon fuel, the stronger the catalytic effect of the precious metal material on the degradation reaction of hydrocarbon fuels. The smaller the diameter of the precious metal wire 21, the larger the contact surface area of ​​the same mass of precious metal material, which is more conducive to catalyzing the degradation reaction. However, excessively thin precious metal wires 21 have low mechanical strength and high processing costs. Considering the catalytic effect, mechanical strength, and cost, a catalyst mesh 2 woven from precious metal wires 21 with a diameter of 0.1 mm to 0.2 mm is selected as the catalyst for the degradation reaction.

[0087] According to an embodiment of the present invention, the injected diesel fuel is 50% to 80% of the total volume of the receiving cavity 12 of the reactor 1.

[0088] According to an embodiment of the present invention, after diesel fuel is injected into the receiving cavity 12, the cover 11, the sealing gasket 13 and the body 10 are fixed together by a plurality of fasteners 14.

[0089] Step S2: Adjust the oxygen supply mechanism 30 to deliver oxygen into the receiving cavity 12 at the first delivery pressure and the first delivery flow rate, and at the same time adjust the inert gas supply mechanism 31 to deliver inert gas into the receiving cavity 12 at the second delivery pressure and the second delivery flow rate.

[0090] According to an embodiment of the present invention, the second conveying pressure is the same as the first conveying pressure, and the second conveying flow rate is not less than the first conveying flow rate.

[0091] According to an embodiment of the present invention, the first conveying pressure and the second conveying pressure are 0.2MPa to 2MPa, and the second conveying flow rate is 1 to 10 times the first conveying flow rate.

[0092] According to an embodiment of the present invention, the first delivery flow rate is 1 ml / min to 10 ml / min.

[0093] According to embodiments of the present invention, adding an inert gas to oxygen can prevent excessively high oxygen concentration and improve the safety of the oxidation reaction between oxygen and diesel. Furthermore, adding an inert gas to oxygen can pre-disperse the oxygen, increasing its dispersion in diesel. The dispersed oxygen forms smaller, faster-moving, and more uniformly dispersed oxygen bubbles in the diesel.

[0094] Step S3: Use temperature controller 5 to adjust the temperature of heating jacket 4 that is fitted on the outside of reactor 1.

[0095] According to an embodiment of the present invention, the temperature of the heating jacket 4 is 50°C to 100°C.

[0096] Step S4: The magnetic actuator 7 drives the stirrer body 6 in the receiving cavity 12 to stir the diesel fuel, causing the diesel fuel to undergo a deterioration reaction, and the deterioration reaction time is 50h~200h.

[0097] According to an embodiment of the present invention, the rotational speed of the stirrer body 6 is 5 r / s to 50 r / s.

[0098] According to an embodiment of the present invention, after obtaining the degraded diesel fuel, the temperature controller 5 is turned off to stop heating, and the first pressure reducing valve 301, the second pressure reducing valve 311, the first flow meter 302, the second flow meter 312, the oxygen source 300, and the inert gas source 310 are turned off. Finally, the magnetic actuator 7 is turned off. The fixing component 14, the cover 11 of the reaction vessel 1, and the sealing gasket 13 are disassembled, and the diesel fuel in the receiving cavity 12 is taken out, which is the enhanced degraded diesel fuel sample.

[0099] According to embodiments of the present invention, since the enhanced degradation reaction of diesel does not require excessively high mass transfer rates and catalyst activity, the present invention applies a precious metal catalyst (precious metal wire 21) primarily used in medium- and high-temperature liquid catalytic reaction systems to the diesel degradation reaction in low-temperature liquid catalytic reaction systems, achieving a moderate increase in the diesel degradation reaction rate. Through the synergistic effect of multiple degradation reaction enhancement methods (increasing the diesel storage temperature, setting the catalyst wire mesh 2, increasing the oxygen content in the diesel, and appropriate stirring intensity), the degradation reaction of diesel in its storage state is accelerated, shortening the time for preparing degraded diesel. Simultaneously, by adjusting the duration of the degradation reaction, diesel with different degrees of degradation in different storage states can be obtained. Diesel with different degrees of degradation in different storage states, with an equivalent storage period of several years to more than ten years, can be prepared in just 50 to 200 hours. This provides a rapid method for preparing calibration and verification test diesel samples for constructing a method for determining the timing of oil changes for long-term stored diesel.

[0100] Example 1

[0101] 3.6L of diesel fuel is added to the receiving cavity 12 of a reactor 1 with an inner diameter of 200mm and a depth of 150mm. An 80-mesh catalyst mesh 2 with a radial length of 198mm and an axial height of 130mm is installed on a groove 110 on the cover 11 of the reactor 1 with an inner diameter of 200mm. The precious metal wire 21 in the catalyst mesh 2 is a platinum wire with a diameter of 0.1mm. The support frame 20 has a width of 2mm and a thickness of 3mm. A stir bar body 6 with a diameter of 10mm is added to the receiving cavity 12. The reactor body 10, the sealing gasket 13, and the cover 11 of the reactor 1 are fixed with fasteners 14.

[0102] Turn on the oxygen source 300 and the inert gas source 310, and adjust the first delivery pressure of the first pressure reducing valve 301 and the second delivery pressure of the second pressure reducing valve 311 to 0.2 MPa. Adjust the first delivery flow rate of the first flow meter 302 to 4 ml / min and the second delivery flow rate of the second flow meter 312 to 40 ml / min.

[0103] Turn on the temperature controller 5 and adjust the heating temperature to 50℃. Start the magnetic drive 7 and adjust the rotation speed of the stirrer body 6 to 5 r / s.

[0104] After the diesel storage condition deterioration reaction continues for 200 hours, the temperature controller 5 is turned off to stop heating, the first pressure reducing valve 301, the second pressure reducing valve 311, the first flow meter 302, the second flow meter 312, the oxygen source 300 and the inert gas source 310 are turned off, and finally the magnetic actuator 7 is turned off.

[0105] Disassemble the fastener 14, the cover 11 of the reactor 1, and the sealing gasket 13, and take out the diesel fuel in the containment cavity 12 to obtain the diesel fuel sample after 200 hours of enhanced degradation.

[0106] Physicochemical property testing showed that the viscosity of the diesel sample in Example 1 at 40°C was 5.25 mm. 2 / s, viscosity change rate is 25.0%, and gum content is 11.3mg / kg.

[0107] Example 2

[0108] 2.5L of diesel fuel is added to the receiving cavity 12 of a reactor 1 with an inner diameter of 200mm and a depth of 150mm. A 20-mesh catalyst mesh 2 with a radial length of 190mm and an axial height of 100mm is installed on a groove 110 on the cover 11 of the reactor 1 with an inner diameter of 200mm. The precious metal wire 21 in the catalyst mesh 2 is palladium wire with a diameter of 0.2mm. The support frame 20 has a width of 3mm and a thickness of 4mm. A stir bar body 6 with a diameter of 10mm is added to the receiving cavity 12. The reactor body 10, the sealing gasket 13, and the cover 11 of the reactor 1 are fixed with fasteners 14.

[0109] Turn on the oxygen source 300 and the inert gas source 310, and adjust the first delivery pressure of the first pressure reducing valve 301 and the second delivery pressure of the second pressure reducing valve 311 to 2 MPa. Adjust the first delivery flow rate of the first flow meter 302 to 25 ml / min, and adjust the second delivery flow rate of the second flow meter 312 to 25 ml / min.

[0110] Turn on the temperature controller 5 and adjust the heating temperature to 100℃. Start the magnetic drive 7 and adjust the rotation speed of the stirrer body 6 to 50 r / s.

[0111] After the diesel storage condition deterioration reaction continues for 50 hours, turn off the temperature controller 5 to stop heating, and turn off the first pressure reducing valve 301, the second pressure reducing valve 311, the first flow meter 302, the second flow meter 312, the oxygen source 300 and the inert gas source 310. Finally, turn off the magnetic actuator 7.

[0112] Disassemble the fastener 14, the cover 11 of the reactor 1, and the sealing gasket 13, and take out the diesel fuel in the receiving cavity 12 to obtain the diesel fuel sample after 50 hours of enhanced degradation.

[0113] Physicochemical property testing showed that the viscosity of the diesel sample in Example 2 at 40°C was 5.48 mm. 2 / s, viscosity change rate is 30.5%, and gum content is 13.3mg / kg.

[0114] Example 3

[0115] 12.5L of diesel fuel is added to the receiving cavity 12 of a reactor 1 with an inner diameter of 300mm and a depth of 300mm. A 40-mesh catalyst mesh 2 with a radial length of 295mm and an axial height of 240mm is installed on a groove 110 on the cover 11 of the reactor 1 with an inner diameter of 300mm. The precious metal wire 21 in the catalyst mesh 2 is a platinum wire with a diameter of 0.1mm. The support frame 20 has a width of 4mm and a thickness of 5mm. A stir bar body 6 with a diameter of 20mm is added to the receiving cavity 12. The reactor body 10, the sealing gasket 13, and the cover 11 of the reactor 1 are fixed with fasteners 14.

[0116] Turn on the oxygen source 300 and the inert gas source 310, and adjust the first delivery pressure of the first pressure reducing valve 301 and the second delivery pressure of the second pressure reducing valve 311 to 1 MPa. Adjust the first delivery flow rate of the first flow meter 302 to 50 ml / min and the second delivery flow rate of the second flow meter 312 to 200 ml / min.

[0117] Turn on the temperature controller 5 and adjust the heating temperature to 80℃. Start the magnetic drive 7 and adjust the rotation speed of the stirrer body 6 to 30r / s.

[0118] After the diesel storage condition deterioration reaction continues for 100 hours, the temperature controller 5 is turned off to stop heating, the first pressure reducing valve 301, the second pressure reducing valve 311, the first flow meter 302, the second flow meter 312, the oxygen source 300 and the inert gas source 310 are turned off, and finally the magnetic actuator 7 is turned off.

[0119] Disassemble the fastener 14, the cover 11 of the reactor 1, and the sealing gasket 13, and take out the diesel fuel in the receiving cavity 12 to obtain the diesel fuel sample after 100 hours of enhanced degradation.

[0120] Physicochemical property testing showed that the viscosity of the diesel sample in Example 3 at 40°C was 5.64 mm. 2 / s, viscosity change rate is 34.3%, and gum content is 14.0mg / kg.

[0121] Example 4

[0122] 3.6L of diesel fuel is added to the containment cavity 12 of a reactor 1 with an inner diameter of 200mm and a depth of 150mm. A stir bar 6 with a diameter of 10mm is added to the containment cavity 12.

[0123] Turn on the temperature controller 5 and adjust the heating temperature to 50℃. Start the magnetic drive 7 and adjust the rotation speed of the stirrer body 6 to 5 r / s.

[0124] After the diesel storage condition deteriorates for 200 hours, the temperature controller 5 is turned off to stop heating, and finally the magnetic actuator 7 is turned off.

[0125] The diesel fuel removed from the containment chamber 12 is the diesel fuel sample after 200 hours of enhanced degradation.

[0126] Physicochemical property testing showed that the viscosity of the diesel sample in Example 4 at 40°C was 4.52 mm. 2 / s, viscosity change rate 7.6%, and gum content 4.1mg / kg.

[0127] Example 5

[0128] 3.6L of diesel fuel is added to the containment cavity 12 of a reactor 1 with an inner diameter of 200mm and a depth of 150mm. A stirrer body 6 with a diameter of 10mm is added to the containment cavity 12, and the body 10, sealing gasket 13, and cover 11 of the reactor 1 are fixed with fasteners 14.

[0129] Turn on the oxygen source 300 and the inert gas source 310, and adjust the first delivery pressure of the first pressure reducing valve 301 and the second delivery pressure of the second pressure reducing valve 311 to 0.2 MPa. Adjust the first delivery flow rate of the first flow meter 302 to 4 ml / min and the second delivery flow rate of the second flow meter 312 to 40 ml / min.

[0130] Turn on the temperature controller 5 and adjust the heating temperature to 50℃. Start the magnetic drive 7 and adjust the rotation speed of the stirrer body 6 to 5 r / s.

[0131] After the diesel storage condition deterioration reaction continues for 200 hours, the temperature controller 5 is turned off to stop heating, the first pressure reducing valve 301, the second pressure reducing valve 311, the first flow meter 302, the second flow meter 312, the oxygen source 300 and the inert gas source 310 are turned off, and finally the magnetic actuator 7 is turned off.

[0132] Disassemble the fastener 14, the cover 11 of the reactor 1, and the sealing gasket 13, and take out the diesel fuel in the containment cavity 12 to obtain the diesel fuel sample after 200 hours of enhanced degradation.

[0133] Physicochemical property testing showed that the viscosity of the diesel sample in Example 5 at 40°C was 4.95 mm. 2 / s, viscosity change rate is 17.9%, and gum content is 8.9mg / kg.

[0134] Examples 1, 2, and 3, through the rational matching of degradation reaction conditions, fully leverage the synergistic accelerating effect of four degradation reaction acceleration measures—stirring, heating, oxygenation, and catalysis—on the diesel fuel degradation reaction. Within the reaction time periods set in each example, degraded diesel fuel samples reaching or exceeding the degradation level required for oil change (viscosity change rate at 40℃ not less than 25.0%, gum content not less than 10.0 mg / kg) were prepared, achieving the functional objectives of the rapid preparation method of this invention.

[0135] On the other hand, Example 4 did not use artificial oxygenation or the addition of a catalyst, and Example 5 did not use the addition of a catalyst; all other degradation reaction conditions were the same as the corresponding degradation reaction conditions in Example 1. The diesel sample of Example 4 had a viscosity of 4.52 mm at 40°C. 2 The viscosity change rate was 7.6% per second, and the gum content was 4.1 mg / kg. The diesel sample in Example 5 had a viscosity of 4.95 mm at 40°C. 2 The viscosity change rate was 17.9% per second, and the gum content was 8.9 mg / kg. In contrast, the diesel sample in Example 1 had a viscosity of 5.25 mm² at 40°C. 2 The viscosity change rate was 25.0%, and the gum content was 11.3 mg / kg. Analysis of the above degradation reaction results shows that stirring, heating, oxygenation, and catalysis can all accelerate the diesel degradation process. Compared to the degradation reaction results of Example 4, the addition of oxygenation in Example 5 increased diesel viscosity by 9.5% and gum content by 4.8 mg / kg within a 200-hour reaction period. Compared to Example 4, the addition of catalysis in Example 1 increased diesel viscosity by 6.1% and gum content by 2.4 mg / kg. The above analysis shows that during the diesel degradation reaction, adding any one of the four accelerating measures (stirring, heating, oxygenation, and catalysis) further accelerates the increase in diesel viscosity and gum content. Meanwhile, under the degradation reaction conditions of Example 1 (heating temperature 50°C, stirring body rotation speed 5 r / s), without the synergistic effect of oxygenation and catalysis, the degree of diesel degradation to reach or exceed the required level for oil change (viscosity change rate at 40°C not less than 25.0%, gum content not less than 10.0 mg / kg) cannot be achieved within the maximum test period (200 h) specified in this invention. Therefore, to ensure the achievement of the required diesel degradation level (the degree of diesel degradation to reach or exceed the required level for oil change) within the degradation reaction conditions specified in this invention, the four diesel degradation acceleration measures—stirring, heating, oxygenation, and catalysis—are all indispensable.

[0136] The embodiments of the present invention have been described above. However, these embodiments are merely illustrative and not intended to limit the scope of the invention. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of the invention is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the invention, and all such substitutions and modifications should fall within the scope of the invention.

Claims

1. A system for accelerating the deterioration of diesel fuel storage conditions, characterized in that, include: A reaction vessel, the interior of which forms a containment cavity, the containment cavity being configured to contain diesel fuel; The catalyst mesh is installed on the upper part of the reactor and located inside the containment cavity, and is suitable for accelerating the deterioration reaction of the diesel fuel; The supply unit is configured to supply oxygen and inert gas to the containment cavity according to a preset delivery pressure and delivery flow rate, respectively, wherein the oxygen is suitable for reacting with the diesel fuel in the atmosphere of the inert gas to cause a deterioration reaction.

2. The system for accelerating the deterioration of diesel fuel storage conditions according to claim 1, characterized in that, The reaction vessel includes: ontology; A cover is provided on the main body, and a groove is provided on the cover in the radial direction. One end of the catalyst mesh is installed in the groove, such that the catalyst mesh is at least partially immersed in the diesel oil.

3. The system for accelerating the deterioration of diesel fuel storage conditions according to claim 1, characterized in that, The supply unit includes: An oxygen supply mechanism is configured to supply oxygen into the containment cavity according to a first delivery pressure and a first delivery flow rate; An inert gas supply mechanism is configured to supply the inert gas into the receiving cavity according to a second supply pressure and a second supply flow rate, wherein the second supply pressure is the same as the first supply pressure and the second supply flow rate is not less than the first supply flow rate; A gas check valve is provided, with its inlet connected to the output of the oxygen supply mechanism and the output of the inert gas supply mechanism, and its outlet connected to the inlet of the reactor, to prevent the oxygen and inert gas supplied to the containment cavity from flowing back.

4. The system for accelerating the deterioration of diesel fuel storage conditions according to claim 2, characterized in that, Also includes: A heating jacket is fitted over the outside of the main body to heat the diesel fuel inside the receiving cavity using the main body; A temperature controller, electrically connected to the heating jacket, is configured to adjust the heating temperature of the heating jacket.

5. The system for accelerating the deterioration of diesel fuel storage conditions according to claim 1, characterized in that, Also includes: The stirring body is disposed at the bottom of the receiving cavity; Multiple magnetic blocks are installed at the end of the stirring body; A magnetic actuator, located on the outside of the reactor, is configured to change the polarity of its two ends by an external power supply device. The magnetic force between the two ends of the magnetic actuator and the plurality of magnetic blocks drives the stirring body to rotate axially around the receiving cavity to stir the diesel fuel.

6. A method for preparing degraded diesel fuel using a system for accelerating the deterioration of diesel fuel storage conditions as described in any one of claims 1-5, characterized in that, include: Diesel fuel is injected into the containment chamber of the reactor equipped with a catalyst mesh; The oxygen supply mechanism is adjusted to deliver oxygen into the containment cavity at a first delivery pressure and a first delivery flow rate, while the inert gas supply mechanism is adjusted to deliver inert gas into the containment cavity at a second delivery pressure and a second delivery flow rate, wherein the second delivery pressure is the same as the first delivery pressure and the second delivery flow rate is not less than the first delivery flow rate. The temperature of the heating jacket fitted around the outside of the reactor is adjusted using a temperature controller; The diesel fuel is stirred by the stirring body in the containment cavity by a magnetic actuator, causing the diesel fuel to undergo a deterioration reaction to obtain deteriorated diesel fuel. The deterioration reaction takes 50h to 200h.

7. The method according to claim 6, characterized in that, The catalyst mesh is made of platinum or palladium, and the density of the catalyst mesh is 20 mesh to 80 mesh.

8. The method according to claim 6, characterized in that, The first conveying pressure and the second conveying pressure are 0.2MPa to 2MPa, and the second conveying flow rate is 1 to 10 times the first conveying flow rate.

9. The method according to claim 6, characterized in that, The temperature of the heating jacket is 50℃~100℃.

10. The method according to claim 6, characterized in that, The rotational speed of the stirrer body is 5 r / s to 50 r / s.

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