Composite biological diesel engine fuel and preparation method thereof

Abstract

The invention provides a composite bio-diesel engine fuel and a preparation method thereof, the composite bio-diesel engine fuel comprises the following raw materials by weight: 10-15 parts of mixed oil, 30-50 parts of straw bio-fuel oil, 20-30 parts of microalgae bio-oil, 4-6 parts of a polyester phosphorus polymer, and 0.5-1 part of an antioxidant. The composite biological diesel engine fuel is prepared from mixed oil, straw biological fuel oil, microalgae biological oil, a polyester phosphorus polymer and an antioxidant as raw materials and has the advantages of being good in combustion performance, good in low-temperature fluidity and the like, the raw materials have reproducibility and environmental friendliness, energy pressure can be effectively relieved, and pollution to the environment and greenhouse gas emission are reduced.

Description

Technical Field

[0001] The present invention relates to the field of fuels, and particularly to a composite biodiesel fuel and a preparation method thereof. Background Art

[0002] With the continuous development of the global economy and the continuous growth of the population, the demand for energy shows a rapid growth trend. Whether it is industrial production, transportation, or daily life, energy plays an indispensable role. Among the many energy consumption fields, the energy demand in the transportation industry is particularly prominent. Diesel, as an important transportation fuel, is widely used in various diesel engine vehicles, ships, and agricultural machinery and other equipment. However, the current global energy supply structure still highly depends on traditional fossil fuels such as oil, coal, and natural gas. According to the statistical data of the International Energy Agency (IEA), in the past few decades, fossil fuels have always dominated the global energy consumption structure. Although the development speed of renewable energy has accelerated in recent years, up to now, the proportion of fossil fuels is still over 80%.

[0003] Traditional diesel will produce a large amount of pollutants during the combustion process, causing serious harm to the environment and human health. The main pollutants produced by diesel combustion include particulate matter (PM), nitrogen oxides (NOx), sulfur oxides (SOx), and hydrocarbons (HC), etc. These pollutants will trigger a series of environmental problems such as acid rain and ozone layer depletion. In order to address the environmental and energy problems brought by traditional diesel, biofuels, as a renewable and environmentally friendly alternative energy, have received extensive attention and research. Biofuels refer to fuels produced through biological pathways, mainly including biodiesel, bioethanol, biomethanol, etc. The raw material sources of biofuels are extensive, including vegetable oils, animal fats, waste oils, crop straws, microalgae, etc.

[0004] Biodiesel is a renewable fuel prepared from animal and vegetable oils through processes such as transesterification reaction. Compared with traditional diesel, biodiesel has the advantages of being renewable, environmentally friendly, and having good lubricity. In the combustion emissions of biodiesel, the contents of particulate matter, sulfur oxides, and hydrocarbons are significantly reduced. At the same time, in the production and use process of biodiesel, its carbon cycle is basically in a balanced state, which can effectively reduce greenhouse gas emissions. However, biodiesel also has some deficiencies, such as poor low-temperature fluidity and low oxidation stability. In a low-temperature environment, biodiesel is prone to crystallization, solidification and other phenomena, affecting its normal use in the engine. In addition, the unsaturated fatty acid esters in biodiesel are easily oxidized with the oxygen in the air, resulting in the deterioration of the oil product and reducing its use performance.

[0005] Bioethanol is another common biofuel, which is usually made from crops such as corn and sugarcane through fermentation and other processes. Bioethanol has the advantages of high octane number and low pollution, and can be mixed with gasoline to reduce gasoline consumption and pollutant emissions. However, the production of bioethanol requires a large amount of food resources, which may cause food security problems. In addition, bioethanol has a low energy density. Compared with gasoline, the same volume of bioethanol can provide less energy, which also limits its widespread application in the transportation field.

[0006] In recent years, with the continuous development of biotechnology, microalgae biofuel, as a new type of biofuel, has gradually become a research hotspot. Microalgae is a type of single-cell or multi-cell aquatic plant with the advantages of fast growth, high oil content, and strong environmental adaptability. Microalgae can use solar energy, carbon dioxide and water for photosynthesis to synthesize a large amount of organic substances such as oils and carbohydrates. By cultivating, harvesting and processing microalgae, microalgae bio-oil can be prepared, and then through a series of conversion processes, it can be prepared into biodiesel, bioethanol and other biofuels. Microalgae biofuel not only has the advantages of being renewable and environmentally friendly, but also its production process does not occupy arable land resources and will not pose a threat to food security.

[0007] Although biofuels have many advantages, a single biofuel often fails to meet the comprehensive requirements of modern transportation industry for fuel performance. For example, biodiesel has poor low-temperature fluidity, which limits its use in cold regions; bioethanol has low energy density, which affects the vehicle's range. Therefore, it is of great practical significance to develop a composite biodiesel fuel with excellent performance and comprehensive utilization of the advantages of multiple biofuels.

[0008] In view of the problems existing in the prior art, the present application aims to solve the problems of poor low-temperature fluidity, poor fuel performance, and serious environmental pollution of biodiesel. Summary of the invention

[0009] Purpose of the invention: The purpose of the present invention is to provide a composite biodiesel fuel and a preparation method thereof, so as to solve the problems of poor low-temperature fluidity, poor fuel performance, and serious environmental pollution of biodiesel.

[0010] The technical solution of the present invention:

[0011] The invention provides a composite biodiesel fuel. The raw materials for preparing the composite biodiesel fuel include, by weight, 10-15 parts of mixed oil, 30-50 parts of straw biofuel, 20-30 parts of microalgae biooil, 4-6 parts of polyester phosphorus polymer and 0.5-1 part of antioxidant.

[0012] Furthermore, the mixed oil is a mixture of one or more of animal oil and rapeseed oil.

[0013] Furthermore, the straw-based biofuel raw material is plant straw; the plant straw is one or more mixtures of corn straw, wheat straw, and rice straw.

[0014] Furthermore, the method for preparing the microalgae bio-oil includes the following steps:

[0015] S1: Dry and crush the microalgae, then put them into a microwave pyrolysis reactor, use silicon carbide as a microwave absorber, and set the microwave power, pyrolysis temperature, and pyrolysis time;

[0016] S2: After the pyrolysis in step S1 is completed, separate the pyrolysis product gas and solid, and cool and condense the bio-oil vapor into a liquid through a condensing device to obtain the microalgae bio-oil.

[0017] Furthermore, the microalgae is one or more mixtures of Chlorella vulgaris, Chlamydomonas reinhardtii, and Scenedesmus obliquus; the moisture content of the microalgae is 0 - 5%.

[0018] Furthermore, the particle size of the microalgae is 1 - 3 mm.

[0019] Furthermore, in step S1, the microwave power is 50 - 100 W, the pyrolysis temperature is 450 - 550 °C, and the pyrolysis time is 10 - 30 min.

[0020] Furthermore, the method for preparing the polyester phosphorus polymer includes the following steps:

[0021] SS1: Dissolve polymethacrylate in a reaction flask containing N,N-dimethylformamide, then add soybean phospholipid and stir evenly;

[0022] SS2: Add azobisisobutyronitrile in step S1, raise the temperature of the reaction flask to 50 - 80 °C, the stirring speed is 100 - 300 r / min, and then keep the temperature constant for reaction for 6 - 12 hours;

[0023] SS3: After the reaction is completed, turn off the heating device, let the reaction flask cool naturally to room temperature, open the reaction kettle, add ethanol, then filter and collect the solid to obtain the polyester phosphorus polymer.

[0024] Furthermore, the mass ratio of polymethacrylate to soybean phospholipid is 3 - 5:1.

[0025] Furthermore, the antioxidant is one or more mixtures of N,N'-diphenyl-p-phenylenediamine, 2,6-di-tert-butyl-p-cresol, and 6-tert-butyl-2,4-dimethylphenol.

[0026] This application also provides a method for preparing a composite biodiesel fuel, which is characterized by including the following steps:

[0027] Step (1): Add the mixed oil, straw-based biofuel, and microalgae bio-oil into a mixing container equipped with a stirring device. At room temperature, stir at a speed of 100 - 150 r / min for 20 - 30 minutes to preliminarily mix the three oils evenly. Slowly add the polyester phosphorus polymer and antioxidant into the above mixing container, increase the stirring speed to 150 - 200 r / min, and continue to stir for 30 - 40 minutes to fully mix all the raw materials evenly to form a uniform mixed material.

[0028] Step (2): Slowly feed the mixed material obtained in step (1) into the high-temperature pyrolysis reactor through the feeding device. During the feeding process, preheat the material, and control the preheating temperature at 100 - 150 °C. After the material enters the high-temperature pyrolysis zone, quickly raise the temperature to the pyrolysis temperature, where the pyrolysis temperature is 400 - 600 °C, and pyrolyze for 10 - 30 minutes.

[0029] Step (3): After high-temperature pyrolysis, separate the gaseous and liquid substances in the gas-liquid separator, and distill, extract, and filter the collected liquid substances to obtain the composite biodiesel fuel.

[0030] Beneficial effects:

[0031] The present invention provides a composite biodiesel fuel. The composite biodiesel fuel of the present invention is prepared by high-temperature pyrolysis of mixed oil, straw-based biofuel, microalgae bio-oil, etc. and then formulated through a certain process. It has the advantages of good combustion performance and good low-temperature fluidity. The raw materials have regenerability and environmental protection, can effectively relieve the energy pressure, and reduce environmental pollution and greenhouse gas emissions. Specific embodiments

[0032] The following will illustrate the present invention in combination with specific implementation schemes. It should be noted that the following examples are examples of the present invention, only used to illustrate the present invention, rather than to limit the present invention. Other combinations and various improvements within the concept of the present invention can be made without departing from the main idea or scope of the present invention.

[0033] Other chemical reagents used in the present invention are all ordinary commercially available analytical pure without special instructions.

[0034] The polymethacrylate is purchased from Evonik Specialties (Shanghai) Co., Ltd., model: VISCOPLEX 10-310; the soybean phospholipid is purchased from Hebei Hongtao Bioengineering Co., Ltd.

[0035] Preparation of straw-based biofuel A:

[0036] S1: Add 2 kg of corn straw, 60 g of copper oxide catalyst, and 500 mL of 1 mol / L sodium hydroxide solution to a hydrothermal reactor, and then seal the reactor well.

[0037] S2: Turn on the heating device of the reactor in step S1, gradually increase the temperature inside the reactor to 230 °C, and the heating rate can be controlled at 8 °C per minute. After reaching the reaction temperature, maintain a constant temperature reaction for 1.5 hours.

[0038] S3: After the reaction is completed, turn off the heating device, let the reactor cool naturally to room temperature, open the reactor, take out the reaction mixture, filter to separate the solid residue from the liquid product, and distill and extract the liquid product to finally obtain straw-based biofuel A.

[0039] Preparation of straw-based biofuel B:

[0040] S1: Add 1 kg of corn straw, 0.5 kg of wheat straw, 0.5 kg of rice straw, 60 g of copper oxide catalyst, and 500 mL of 1 mol / L sodium hydroxide solution to a hydrothermal reactor, and then seal the reactor well.

[0041] S2: Turn on the heating device of the reactor in step S1, gradually increase the temperature inside the reactor to 230 °C, and the heating rate can be controlled at 8 °C per minute. After reaching the reaction temperature, maintain a constant temperature reaction for 1.5 hours.

[0042] S3: After the reaction is completed, turn off the heating device, let the reactor cool naturally to room temperature, open the reactor, take out the reaction mixture, filter to separate the solid residue from the liquid product, and distill and extract the liquid product to finally obtain straw-based biofuel B.

[0043] Preparation of microalgae bio-oil A:

[0044] S1: Crush 0.5 kg of Chlorella with a water content of 5% into a particle size of 2 mm, and then put it into a microwave pyrolysis reactor in 10 batches. Take 1.5 kg of silicon carbide as a microwave absorber, set the microwave power to 50 W, the pyrolysis temperature to 450 °C, and the pyrolysis time to 25 min.

[0045] S2: After the pyrolysis in step S1 is completed, separate the pyrolysis product gas and solid, cool and condense the bio-oil vapor into a liquid through a condensation device to obtain the microalgae bio-oil A, and the yield of the microalgae bio-oil is 52.8%.

[0046] Preparation of microalgae bio-oil B:

[0047] S1: Respectively crush 0.25 kg of Chlorella and Chlamydomonas reinhardtii with a water content of 5% into particles with a particle size of 2 mm, and then put them into a microwave pyrolysis reactor in 10 batches. Take 1.5 kg of silicon carbide as a microwave absorber, set the microwave power to 50 W, the pyrolysis temperature to 450 °C, and the pyrolysis time to 25 min;

[0048] S2: After the pyrolysis in step S1 is completed, separate the pyrolysis product gas and solid. Cool and condense the bio-oil vapor into a liquid through a condensation device to obtain the microalgae bio-oil B, and the yield of the microalgae bio-oil is 50.2%.

[0049] Preparation of microalgae bio-oil C:

[0050] S1: Crush 0.5 kg of Chlorella with a water content of 5% into particles with a particle size of 2 mm, and then put them into a microwave pyrolysis reactor in 10 batches. Take 1 kg of silicon carbide as a microwave absorber, set the microwave power to 33 W, the pyrolysis temperature to 660 °C, and the pyrolysis time to 25 min;

[0051] S2: After the pyrolysis in step S1 is completed, separate the pyrolysis product gas and solid. Cool and condense the bio-oil vapor into a liquid through a condensation device to obtain the microalgae bio-oil C, and the yield of the microalgae bio-oil is 30.2%.

[0052] Preparation of polyester phosphorus polymer A:

[0053] SS1: Dissolve 50 g of polymethacrylate in a reaction flask containing 300 mL of N,N-dimethylformamide, and then add 10 g of soybean phospholipid and stir evenly;

[0054] SS2: Add 0.3 g of azobisisobutyronitrile in step S1, raise the temperature of the reaction flask to 65 °C, and the stirring speed is 200 r / min, and then keep the constant temperature reaction for 8 hours;

[0055] SS3: After the reaction is completed, turn off the heating device, let the reaction flask cool naturally to room temperature, open the reaction kettle, add 500 mL of ethanol, and then filter and collect the solid to obtain polyester phosphorus polymer A.

[0056] Preparation of polyester phosphorus polymer B:

[0057] SS1: Dissolve 45 g of polymethacrylate in a reaction flask containing 300 mL of N,N-dimethylformamide, and then add 15 g of soybean phospholipid and stir evenly;

[0058] SS2: Add 0.3 g of azobisisobutyronitrile in step S1, raise the temperature of the reaction flask to 65 °C, and the stirring speed is 200 r / min, and then keep the constant temperature reaction for 8 hours;

[0059] SS3: After the reaction is completed, turn off the heating device, let the reaction flask cool naturally to room temperature, open the reaction kettle, add 500 mL of ethanol, then filter to collect the solid, and obtain polyester phosphorus polymer B.

[0060] Preparation of polyester phosphorus polymer C:

[0061] SS1: Dissolve 30 g of polymethacrylate in a reaction flask containing 300 mL of N,N-dimethylformamide, then add 30 g of soy lecithin and stir evenly.

[0062] SS2: Add 0.3 g of azobisisobutyronitrile in step S1, raise the temperature of the reaction flask to 65 °C, the stirring speed is 200 r / min, and then keep the temperature constant for 8 hours.

[0063] SS3: After the reaction is completed, turn off the heating device, let the reaction flask cool naturally to room temperature, open the reaction kettle, add 500 mL of ethanol, then filter to collect the solid, and obtain polyester phosphorus polymer C.

[0064] Example 1

[0065] Step (1): Add 4 parts of lard, 2 parts of fish oil, 2 parts of rapeseed oil, 2 parts of palm oil, 30 parts of straw-based biofuel A, and 30 parts of microalgae bio-oil A to a mixing container with a stirring device. At room temperature, stir at a stirring speed of 150 r / min for 20 minutes to preliminarily mix the three oils evenly. Slowly add 4 parts of polyester phosphorus polymer A and 0.5 part of N,N'-diphenyl-p-phenylenediamine to the above mixing container, increase the stirring speed to 200 r / min, and continue to stir for 30 minutes to fully mix all the raw materials evenly to form a uniform mixed material.

[0066] Step (2): Slowly feed the mixed material mixed in step (1) into the high-temperature pyrolysis reactor through the feeding device. During the feeding process, preheat the material to 150 °C, and then after feeding the material into the high-temperature pyrolysis zone, quickly raise the temperature to 600 °C and pyrolyze for 20 minutes.

[0067] Step (3): After high-temperature pyrolysis, separate the gaseous and liquid substances in the gas-liquid separator, and distill, extract, and filter the collected liquid substances to obtain a composite biodiesel fuel.

[0068] Example 2

[0069] It is different from the composite biodiesel fuel prepared in Example 1 in that: in step (1), 4 parts of lard, 2 parts of fish oil, 2 parts of rapeseed oil, 2 parts of palm oil, 30 parts of straw-based biofuel A, 30 parts of microalgae bio-oil A, 4 parts of polyester phosphorus polymer A, and 0.5 part of N,N'-diphenyl-p-phenylenediamine are replaced with 10 parts of lard, 50 parts of straw-based biofuel B, 20 parts of microalgae bio-oil B, 6 parts of polyester phosphorus polymer A, 0.5 part of N,N'-diphenyl-p-phenylenediamine, and 0.5 part of 2,6-di-tert-butyl-p-cresol.

[0070] Example 3

[0071] It is different from the composite biodiesel fuel prepared in Example 1 in that: in step (1), 4 parts of polyester phosphorus polymer A are replaced with 4 parts of polyester phosphorus polymer B.

[0072] Example 4

[0073] It is different from the composite biodiesel fuel prepared in Example 1 in that: in step (1), 4 parts of polyester phosphorus polymer A are replaced with 4 parts of polyester phosphorus polymer C.

[0074] Comparative Example 1:

[0075] It is different from the composite biodiesel fuel prepared in Example 1 in that: in step (1), straw-based biofuel A is not added.

[0076] Comparative Example 2:

[0077] It is different from the composite biodiesel fuel prepared in Example 1 in that: in step (1), microalgae bio-oil A is not added.

[0078] Comparative Example 3:

[0079] It is different from the composite biodiesel fuel prepared in Example 1 in that: in step (1), polyester phosphorus polymer A is not added.

[0080] The composite biodiesel fuels prepared in Examples 1-4 and Comparative Examples 1-3 were subjected to the following tests:

[0081] 1. Pour point: According to the standard GB / T 510-2018 "Petroleum Products - Determination of Pour Point", the pour points of the composite biodiesel fuels prepared in Examples 1-4 and Comparative Examples 1-3 were tested to judge the low-temperature fluidity of the fuels. The lower the pour point, the better the fluidity, and the standard requirement is <0°C.

[0082] 2. Flash point: According to the standard GB / T 261-2021 "Determination of Flash Point - Pensky-Martens Closed Cup Method", the flash points of the composite biodiesel fuels prepared in Examples 1-4 and Comparative Examples 1-3 were tested, and the standard requirement is ≥62°C.

[0083] 3. Density: The density of the composite biodiesel fuel prepared in Examples 1-4 and Comparative Examples 1-3 was tested in accordance with the standard GB / T 1884-2000, "Laboratory Determination of Density of Crude Oil and Liquid Petroleum Products (Hydrometer Method)". The standard requires ≥0.83 g / cm 3 .

[0084] 4. Sulfur content: The sulfur content of the composite biodiesel fuel prepared in Examples 1-4 and Comparative Examples 1-3 was tested in accordance with the standard SH / T 0689-2000, "Determination of Total Sulfur Content in Light Hydrocarbons, Engine Fuels and Other Petroleum Products (Ultraviolet Fluorescence Method)". The standard sulfur content is <10 mg / kg.

[0085] 5. Calorific value: The calorific value of the composite biodiesel fuel prepared in Examples 1-4 and Comparative Examples 1-3 was tested in accordance with the standard GB / T 384-1981, "Method for Determination of Calorific Value of Petroleum Products". The standard requires ≥10000 Kcal / kg.

[0086] Table 1: Performance test results table

[0087]

[0088] As can be seen from Table 1, the composite biodiesel fuel prepared by the present invention has a low pour point, low flash point, low density, high calorific value, and low sulfur content, and has the advantages of good combustion performance, good low-temperature fluidity, renewable and environmentally friendly raw materials, which can effectively relieve the energy pressure, reduce environmental pollution and greenhouse gas emissions. Specifically, as can be seen from the comparison between Example 4 and Example 1, when preparing the polyester phosphorus polymer, an unreasonable mass ratio of polymethacrylate to soybean phospholipid will cause the pour point of the composite biodiesel fuel to become higher, the flash point to become higher, and the calorific value to become lower. Although it meets the standard requirements, it does not reach the expected effect of the present invention; as can be seen from the comparison between Comparative Example 1 and Example 1, when no straw-based biofuel is added, it will cause the pour point of the composite biodiesel fuel to become higher, the flash point to become higher, the density to become larger, the calorific value to become lower, and the sulfur content to become higher. Although it meets the standard requirements, it does not reach the expected effect of the present invention; as can be seen from the comparison between Comparative Example 2 and Example 1, when no microalgae biooil is added, it will cause the pour point of the composite biodiesel fuel to become higher and the calorific value to become lower. Although it meets the standard requirements, it does not reach the expected effect of the present invention; as can be seen from the comparison between Comparative Example 3 and Example 1, when no polyester phosphorus polymer is added, it will cause the pour point of the composite biodiesel fuel to become higher, the flash point to become higher, the density to become larger, and the calorific value to become lower. Although it meets the standard requirements, it does not reach the expected effect of the present invention.

[0089] The present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention. However, these corresponding changes and modifications should all fall within the protection scope of the appended claims of the present invention.

Claims

1. A composite biodiesel fuel, characterized in that: The raw materials for preparing the composite biodiesel fuel include, by weight, 10-15 parts of mixed oil, 30-50 parts of straw biofuel, 20-30 parts of microalgae biooil, 4-6 parts of polyester phosphorus polymer, and 0.5-1 part of antioxidant.

2. The composite biodiesel fuel according to claim 1, characterized in that: The mixed oil is a mixture of one or more of animal oil and rapeseed oil.

3. The composite biodiesel fuel according to claim 1, characterized in that: The straw-based biofuel raw material is plant straw; the plant straw is a mixture of one or more of corn straw, wheat straw and rice straw.

4. The composite biodiesel fuel according to claim 1, characterized in that: The method for preparing microalgae bio-oil comprises the following steps: S1: Dry and crush the microalgae, then put them into a microwave pyrolysis reactor, use silicon carbide as a microwave absorber, and set the microwave power, pyrolysis temperature, and pyrolysis time; S2: After the pyrolysis in step S1 is completed, the pyrolysis product gas and solid are separated, and the bio-oil vapor is cooled and condensed into a liquid state through a condensation device to obtain the microalgae bio-oil.

5. The composite biodiesel fuel according to claim 4, characterized in that: The microalgae is a mixture of one or more of Chlorella vulgaris, Chlamydomonas reinhardtii and Scenedesmus; the moisture content of the microalgae is 0-5%; and the particle size of the microalgae is 1-3 mm.

6. The composite biodiesel fuel according to claim 4, characterized in that: The microwave power in step S1 is 50-100 W, the pyrolysis temperature is 450-550° C., and the pyrolysis time is 10-30 min.

7. The composite biodiesel fuel according to claim 1, characterized in that: The preparation method of the polyester phosphorus polymer comprises the following steps: SS1: Dissolve polymethacrylate in a reaction bottle containing N,N-dimethylformamide, then add soybean lecithin and stir evenly; SS2: Add azobisisobutyronitrile in step S1, raise the temperature of the reaction bottle to 50-80°C, stir at a speed of 100-300 r / min, and then keep the constant temperature for reaction for 6-12 hours; SS3: After the reaction is completed, turn off the heating device, let the reaction bottle cool naturally to room temperature, open the reactor, add ethanol, and then filter and collect the solid to obtain a polyester phosphorus polymer.

8. The composite biodiesel fuel according to claim 7, characterized in that: The mass ratio of the polymethacrylate to soybean lecithin is 3-5:

1.

9. The composite biodiesel fuel according to claim 8, characterized in that: The antioxidant is a mixture of one or more of N,N'-diphenyl-p-phenylenediamine, di-tert-butyl-p-cresol, and 6-tert-butyl-2,4-dimethylphenol.

10. The method for preparing the composite biodiesel fuel according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step (1): adding the mixed oil, straw-based biofuel and microalgae biofuel into a mixing container equipped with a stirring device, stirring at a stirring speed of 100-150 r / min for 20-30 minutes at room temperature to preliminarily mix the three oils, slowly adding the polyester phosphorus polymer and the antioxidant into the mixing container, increasing the stirring speed to 150-200 r / min, and continuing to stir for 30-40 minutes to fully mix all the raw materials to form a uniform mixture; Step (2): slowly feeding the mixed material mixed in step (1) into a high-temperature cracking reactor through a feeding device. During the feeding process, the material is preheated, and the preheating temperature is controlled at 100-150° C. After the material enters the high-temperature cracking zone, the temperature is rapidly raised to the cracking temperature, the cracking temperature is 400-600° C., and the cracking is carried out for 10-30 minutes; Step (3): After high-temperature pyrolysis, the gaseous substance and the liquid substance are separated in a gas-liquid separator, and the collected liquid substance is distilled, extracted, and filtered to obtain a composite biodiesel fuel.

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