Coaly alcohol-based fuel as well as preparation method and application thereof
By preparing coal-quality alcohol-based fuel, the problems of fossil energy depletion and environmental pollution are solved, and a renewable fuel alternative is provided, with good fuel economy and emission performance, suitable for ignition internal combustion engines.
Patent Information
- Application Number
- CN202510759045.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-09
- Publication Date
- 2025-09-02
AI Technical Summary
The excessive dependence of fossil energy in the prior art leads to resource depletion and environmental pollution, and the fuel of ignition internal combustion engines mainly relies on oil, emits a large amount of pollutants, and lacks alternatives to renewable fuels.
It provides a coal-quality alcohol-based fuel consisting of methanol, polyol light components, coal tar hydrogenated gasoline component oil, isooctane and cracked gasoline light components. It is prepared through a specific process and meets the national standard standards and is suitable for ignition internal combustion engines.
The fuel has good fuel economy, reduces fuel consumption per unit mileage, reduces exhaust emissions, can completely replace gasoline, and exhibits good cold start performance in high-altitude and low-pressure environments, widening the use scenarios for cracked gasoline.
Smart Images
Figure CN120574615A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of fuel technology, and in particular to a coal-based alcohol fuel and a preparation method and application thereof. Background Art
[0002] Fossil energy is a non-renewable resource. As extraction increases, it gradually becomes depleted. Over-reliance on fossil energy can lead to energy shortages. Using only petroleum cannot fully utilize my country's abundant coal and limited oil resources. Currently, the primary fuel for spark-ignition internal combustion engines in China is petroleum. The combustion of fossil energy releases large amounts of pollutants such as carbon dioxide and sulfur oxides, leading to air pollution, acid rain, and the greenhouse effect, seriously impacting the ecological environment and human health. Existing oil refining processes, addressing high emissions of carbon, sulfur, and other substances, have long faced technical bottlenecks and have not achieved significant technical results. Furthermore, the increasing number of vehicles, particularly those with spark-ignition engines, has further increased gasoline consumption and exhaust emissions.
[0003] In response to the above problems, it is necessary to leverage my country's advantage of abundant coal resources and conduct research and development of related fuels. Summary of the Invention
[0004] The present invention addresses the deficiencies of the prior art by providing a coal-based alcohol fuel, a preparation method, and applications thereof. Through a rational formulation design, the coal-based alcohol fuel achieves key performance indicators superior to national gasoline standards, exhibits excellent fuel economy, reduces fuel consumption per mileage, and reduces tail gas emissions. It can completely replace gasoline and is compatible with national standard refined oil products without requiring any vehicle modifications. It also addresses the issue of pyrolysis gasoline being unable to be directly used as engine fuel, broadening the application scenarios for pyrolysis gasoline.
[0005] To achieve the above objectives, in a first aspect, the present invention provides a coal-based alcohol fuel, which comprises: 15%-23% methanol, 5%-9% polyol light components, 12%-20% coal tar hydrogenated gasoline component oil, 17%-28% isooctane and 32%-45% pyrolysis gasoline light components.
[0006] Preferably, the coal-based alcohol fuel comprises: 18% methanol, 7.5% polyol light components, 15% coal tar hydrogenated gasoline component oil, 22% isooctane and 37.5% pyrolysis gasoline light components.
[0007] Preferably, the purity of the methanol and isooctane is not less than 99.5%, the light component of the polyol is a C4-C8 mixed alcohol, the coal tar hydrogenated gasoline component oil is a component oil with a dry point below 130°C obtained by a hydrogenation process of coal tar; and the light component of pyrolysis gasoline is a component of pyrolysis gasoline with a dry point below 120°C.
[0008] In a second aspect, the present invention provides a method for preparing the coal-based alcohol fuel described in any one of the first aspects above, the preparation method comprising:
[0009] A certain proportion of pH regulating liquid is added to the polyol according to the acidity, and then the first distillation is performed to obtain the light component of the polyol;
[0010] Mixing the polyol light component and coal tar hydrogenated gasoline component oil, and performing azeotropic dehydration treatment to obtain a first product;
[0011] Performing a second distillation cut on the pyrolysis gasoline to obtain a light component of the pyrolysis gasoline;
[0012] At normal temperature and pressure, the first product and methanol are sequentially added to a reactor, stirred for a first time, and then the pyrolysis gasoline light component is added and stirred for a second time. Finally, isooctane is added and stirred for a third time, and the mixture is allowed to stand for a fourth time. After filtering, the coal-based alcohol-based fuel is obtained. The coal-based alcohol-based fuel comprises: 15%-23% of methanol, 5%-9% of polyol light components, 12%-20% of coal tar hydrogenated gasoline component oil, 17%-28% of isooctane, and 32%-45% of pyrolysis gasoline light components.
[0013] Preferably, the distillation range of the first distillation cut is less than 150°C.
[0014] Preferably, the conditions of the azeotropic dehydration treatment are: temperature 88° C.-95° C., time 100 min-150 min.
[0015] Preferably, the distillation range of the second distillation cut is less than 130°C.
[0016] Preferably, the first time is 10 min to 20 min, the second time is 10 min to 20 min, the third time is 20 min to 40 min, and the fourth time is 36 hours to 72 hours.
[0017] Preferably, the filter cloth size is 10000 mesh.
[0018] In a third aspect, the present invention provides a use of the coal-based alcohol-based fuel described in any one of the first aspects or the coal-based alcohol-based fuel prepared by the preparation method described in any one of the second aspects, wherein the coal-based alcohol-based fuel is used in a spark-ignition internal combustion engine.
[0019] The coal-based alcohol fuel provided by the embodiment of the present invention, wherein the light component of the polyol and methanol can be prepared using biomass materials, has renewable conditions, can reduce the resource consumption of oil and gas, improves the traditional energy structure, and enhances energy security. The component oil of coal tar hydrogenated gasoline comes from coal chemical products, and has fewer carbon atoms per unit mass than petrochemical products, which reduces carbon emissions, and has a lower sulfur content, which can reduce sulfide emissions, thereby reducing environmental pollution. Moreover, through reasonable formula design, the key indicators of the coal-based alcohol fuel are better than the national standards for gasoline, have good fuel economy, reduce fuel consumption per unit mileage, reduce tail gas emissions, can completely replace gasoline, and can also be used in conjunction with national standard refined oil without any modification to the vehicle. It also solves the problem that pyrolysis gasoline cannot be directly used as engine fuel, and broadens the application scenarios of pyrolysis gasoline. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a flow chart of a method for preparing a coal-based alcohol-based fuel provided by an embodiment of the present invention. DETAILED DESCRIPTION
[0021] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the embodiments described are only some, not all, of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.
[0022] The technical solution of the present invention is further described in detail below through accompanying drawings and examples. The coal-based alcohol fuel provided by the present invention comprises: 15%-23% methanol, 5%-9% polyol light components, 12%-20% coal tar hydrogenated gasoline component oil, 17%-28% isooctane, and 32%-45% pyrolysis gasoline light components. Preferably, the fuel comprises: 18% methanol, 7.5% polyol light components, 15% coal tar hydrogenated gasoline component oil, 22% isooctane, and 37.5% pyrolysis gasoline light components.
[0023] Among them, the purity of methanol and isooctane is not less than 99.5%, the light component of polyol is specifically C4-C8 mixed alcohol, the coal tar hydrogenated gasoline component oil is the component oil with a dry point below 130°C obtained by coal tar through a hydrogenation process; the light component of pyrolysis gasoline is the component of pyrolysis gasoline with a dry point below 120°C.
[0024] Methanol, as a solvent, helps dissolve other ingredients. As a fuel additive, it can improve combustion efficiency, enhance anti-knock performance, and reduce carbon emissions. The light component of polyols primarily addresses the incompatibility and stratification issues between polar substances like methanol and non-polar hydrocarbons. It strengthens the embedding reaction and has a co-solvent effect. It also has the function of supporting combustion with oxygen to enhance anti-knock performance. Isooctane is a standard component for determining anti-knock performance. 100% pure isooctane has an octane number equal to that of a spark-ignition internal combustion engine fuel #100, which can enhance the product's anti-knock performance. The function of coal tar hydrogenated gasoline component oil is to bridge the distillation range gaps of each component, allowing the entropy and enthalpy of the components to fully dissolve and interconnect. In spark-ignition internal combustion engine applications, there will be no problems with starting acceleration or other issues caused by dissimilar chemical structures and non-progressive distillation ranges.
[0025] The coal-based alcohol fuel provided by the embodiment of the present invention, wherein the light component of the polyol and methanol can be prepared using biomass materials, has renewable conditions, can reduce the resource consumption of oil and gas, improves the traditional energy structure, and enhances energy security. The component oil of coal tar hydrogenated gasoline comes from coal chemical products, and has fewer carbon atoms per unit mass than petrochemical products, which reduces carbon emissions, and has a lower sulfur content, which can reduce sulfide emissions, thereby reducing environmental pollution. Moreover, through reasonable formula design, the key indicators of the coal-based alcohol fuel are better than the national standards for gasoline, have good fuel economy, reduce fuel consumption per unit mileage, reduce tail gas emissions, can completely replace gasoline, and can also be used in conjunction with national standard refined oil without any modification to the vehicle. It also solves the problem that pyrolysis gasoline cannot be directly used as engine fuel, and broadens the application scenarios of pyrolysis gasoline.
[0026] In addition, the coal-based alcohol fuel of the embodiment of the present invention can not only provide a better combustion-supporting effect for combustion, improve combustion completeness and thermal efficiency, but also save fuel, have better cold start performance in high-altitude, low-pressure cold environments, and significantly improve power. In addition, the raw materials of the coal-based alcohol fuel are mostly coal chemical products, which are economical and affordable. There are a large number of coal chemical products that can be used as raw materials, which effectively controls factory costs and has better economic benefits.
[0027] The present invention also provides a method for preparing a coal-based alcohol fuel. It should be noted that the sources, components and functions of the various substances in the coal-based alcohol fuel involved in this embodiment are the same as those described above and will not be repeated. The process of the preparation method is as follows: Figure 1 As shown, the following steps are included:
[0028] Step 110, adding a certain proportion of pH regulating liquid to the polyol according to the acidity, and then performing a first distillation cut to obtain a light component of the polyol;
[0029] Specifically, the certain proportion can be 0.2%. The pH adjusting liquid can be sodium hydroxide and / or potassium hydroxide. The pH value after adjustment is neutral or weakly acidic. An industrial distillation tower is used for distillation cutting, and the components with a distillation range of less than 150°C are condensed and collected to obtain the light components of the polyol.
[0030] Step 120: mixing the light component of the polyol and the coal tar hydrogenated gasoline component oil, and performing azeotropic dehydration treatment to obtain a first product;
[0031] Specifically, the mixing of the polyol light component and the coal tar hydrogenated gasoline component can be carried out in a reactor. Azeotropic dehydration can be carried out in an azeotropic dehydration apparatus under the following conditions: a temperature of 88°C-95°C, preferably 90°C, and a time of 100-150 minutes, preferably 120 minutes. The azeotropic dehydration process is completed when the amount of water in the moisture collector does not increase for 15 minutes. The first product is a mixture of the polyol light component and the coal tar hydrogenated gasoline component after water has been removed.
[0032] As a preferred solution, 0.002% by weight of polyetheramine and 0.03% by weight of diethanolamine can be added to the mixture of the polyol light component and the coal tar hydrogenated gasoline component oil. The polyetheramine can reduce the formation of colloid in the product, and the diethanolamine can reduce the odor of the polyol light component.
[0033] Step 130, performing a second distillation on the pyrolysis gasoline to obtain a light component of the pyrolysis gasoline;
[0034] Specifically, the distillation range of the second distillation cut is less than 130°C.
[0035] Step 140: adding the first product and methanol to a reactor in sequence at room temperature and pressure, stirring for a first time, adding the light fraction of pyrolysis gasoline, stirring for a second time, and finally adding isooctane, stirring for a third time, allowing to stand for a fourth time, and filtering to obtain a coal-based alcohol fuel;
[0036] Stirring can be achieved using an electric stirrer at a speed of 200-300 rpm. The first stirring time can be 10-20 minutes, preferably 15 minutes. The second stirring time can be 10-20 minutes, preferably 15 minutes. The third stirring time can be 20-40 minutes, preferably 30 minutes. The fourth stirring time can be 36-72 hours, preferably 48 hours. The purpose of the static stirring is to allow solid particles or flocculent impurities contained in the raw materials to settle to the bottom by gravity, facilitating the subsequent filtration. The filter cloth size can be 10,000 mesh, primarily to remove solid particles or flocculent impurities introduced into the product from the raw materials and various production equipment. The coal-based alcohol fuel specifically comprises: 15%-23% methanol, 5%-9% light components of polyols, 12%-20% coal tar hydrogenated gasoline component oil, 17%-28% isooctane, and 32%-45% light components of pyrolysis gasoline.
[0037] The present invention provides a method for preparing a coal-based alcohol fuel by using a continuous physical embedding reaction at room temperature and pressure. The method has a simple process, reduces production safety risks, saves energy, reduces enterprise costs, and is easy to scale up, with broad prospects for promotion and application.
[0038] The coal-based alcohol fuel provided by the present invention can be used in spark-ignition internal combustion engines.
[0039] To better understand the technical solution provided by the present invention, the following uses a number of specific examples to illustrate the specific process of preparing coal-based alcohol-based fuel using the method provided by the above embodiment of the present invention, as well as the properties of the prepared coal-based alcohol-based fuel.
[0040] Example 1
[0041] Step 1: Add 0.2% pH adjusting liquid to the polyol according to the acidity, then perform the first distillation and cut, and collect the components with a distillation range of less than 150° C., which are the light components of the polyol.
[0042] Step 2: Mix the light component of the polyol and the coal tar hydrogenated gasoline component oil, add 0.002% of polyetheramine and 0.03% of diethanolamine, mix well, and perform azeotropic dehydration treatment at 90° C. for 120 minutes to obtain the first product.
[0043] Step 3: Perform a second distillation on the pyrolysis gasoline, and collect the components with a distillation range of less than 130° C., which are the light components of the pyrolysis gasoline.
[0044] Step 4: Add the first product and methanol sequentially to a reactor at room temperature and pressure, stir at 250 rpm using an electric stirrer for 15 minutes, then add the pyrolysis gasoline light component and continue stirring for 15 minutes. Finally, add isooctane and continue stirring for 30 minutes. The mixture is allowed to stand for 48 hours and filtered through a 10,000-mesh filter cloth to obtain a coal-based alcohol fuel. The coal-based alcohol fuel specifically comprises: 7.5% of a light component of a polyol, 15% of a coal tar hydrogenated gasoline component oil, 18% of methanol, 22% of isooctane, and 37.5% of a light component of pyrolysis gasoline.
[0045] Example 2
[0046] Step 1: Add 0.2% pH adjusting liquid to the polyol according to the acidity, then perform the first distillation and cut, and collect the components with a distillation range of less than 150° C., which are the light components of the polyol.
[0047] Step 2: Mix the light component of the polyol and the coal tar hydrogenated gasoline component oil, add 0.002% of polyetheramine and 0.03% of diethanolamine, mix well, and perform azeotropic dehydration treatment at 88° C. for 150 minutes to obtain the first product.
[0048] Step 3: Perform a second distillation on the pyrolysis gasoline, and collect the components with a distillation range of less than 130° C., which are the light components of the pyrolysis gasoline.
[0049] Step 4: Add the first product and methanol sequentially to a reactor at room temperature and pressure, stir at 200 rpm using an electric stirrer for 20 minutes, then add the pyrolysis gasoline light component and continue stirring for 20 minutes. Finally, add isooctane and continue stirring for 40 minutes. The mixture is allowed to stand for 36 hours and filtered through a 10,000-mesh filter cloth to obtain a coal-based alcohol fuel. The coal-based alcohol fuel specifically comprises: 9% polyol light component, 12% coal tar hydrogenated gasoline component oil, 23% methanol, 20% isooctane, and 36% pyrolysis gasoline light component.
[0050] Example 3
[0051] Step 1: Add 0.2% pH adjusting liquid to the polyol according to the acidity, then perform the first distillation and cut, and collect the components with a distillation range of less than 150° C., which are the light components of the polyol.
[0052] Step 2: Mix the light component of the polyol and the coal tar hydrogenated gasoline component oil, add 0.002% of polyetheramine and 0.03% of diethanolamine, mix well, and perform azeotropic dehydration treatment at 90° C. for 120 minutes to obtain the first product.
[0053] Step 3: Perform a second distillation on the pyrolysis gasoline, and collect the components with a distillation range of less than 130° C., which are the light components of the pyrolysis gasoline.
[0054] Step 4: Add the first product and methanol sequentially to a reactor at room temperature and pressure, stir at 300 rpm for 10 minutes using an electric stirrer, then add the pyrolysis gasoline light component and continue stirring for 10 minutes. Finally, add isooctane and continue stirring for 20 minutes. The mixture is allowed to stand for 72 hours and filtered through a 10,000-mesh filter cloth to obtain a coal-based alcohol fuel. The coal-based alcohol fuel specifically comprises: 6% polyol light component, 18% coal tar hydrogenated gasoline component oil, 16% methanol, 28% isooctane, and 32% pyrolysis gasoline light component.
[0055] Example 4
[0056] Step 1: Add 0.2% pH adjusting liquid to the polyol according to the acidity, then perform the first distillation and cut, and collect the components with a distillation range of less than 150° C., which are the light components of the polyol.
[0057] Step 2: Mix the light component of the polyol and the coal tar hydrogenated gasoline component oil, add 0.002% of polyetheramine and 0.03% of diethanolamine, mix well, and perform azeotropic dehydration treatment at 90° C. for 120 minutes to obtain the first product.
[0058] Step 3: Perform a second distillation on the pyrolysis gasoline, and collect the components with a distillation range of less than 130° C., which are the light components of the pyrolysis gasoline.
[0059] Step 4: Add the first product and methanol sequentially to a reactor at room temperature and pressure, stir at 280 rpm using an electric stirrer for 18 minutes, then add the pyrolysis gasoline light component and continue stirring for 18 minutes. Finally, add isooctane and continue stirring for 35 minutes. The mixture is allowed to stand for 50 hours and filtered through a 10,000-mesh filter cloth to obtain a coal-based alcohol fuel. The coal-based alcohol fuel specifically comprises: 5% of a light component of a polyol, 18% of a coal tar hydrogenated gasoline component oil, 15% of methanol, 17% of isooctane, and 45% of a light component of pyrolysis gasoline.
[0060] First, the coal-based alcohol fuel prepared in Example 1 was tested according to the test method and quality indicators specified in the National VI B gasoline index test standard. The test results are shown in Table 1.
[0061] Table 1 shows the test results of the coal-based alcohol fuel prepared in Example 1 of the present invention.
[0062]
[0063] Table 1 It can be seen from Table 1 that the coal-based alcohol fuel prepared in Example 1 of the present invention meets the national gasoline standards and has a very low sulfur content, which can reduce pollution to the environment.
[0064] Then, the economic performance of the coal-based alcohol fuel prepared in Example 3 of the present invention, conventional gasoline (95#), and the coal-based alcohol fuel prepared in Example 3 and conventional gasoline was tested in different mixing ratios. The test vehicles were all Passats. Among them, the mixing ratios were all the mixing ratios between Example 3 and conventional gasoline, with mixing ratio 1 being 2:8, mixing ratio 2 being 4:6, mixing ratio 3 being 6:4, and mixing ratio 4 being 8:2.
[0065] Table 2 shows the economic performance test results of the coal-based alcohol-based fuel, conventional gasoline, and a mixture of the coal-based alcohol-based fuel and conventional gasoline prepared in Example 3 of the present invention.
[0066]
[0067] Table 2
[0068] As can be seen from Table 2, after multiple tests, the fuel consumption of the coal-based alcohol-based fuel prepared in Example 3 is lower than that of traditional gasoline under different road conditions, especially when driving on mountain roads, it can save 16% of fuel consumption, and the fuel consumption can also be reduced after mixing the coal-based alcohol-based fuel of the present application with traditional gasoline, indicating that the economic performance of the coal-based alcohol-based fuel of the present application is very good.
[0069] Table 3 shows the power performance test results of the coal-based alcohol fuels prepared in Examples 1-4 of the present invention and traditional gasoline.
[0070] fuel Average acceleration time of four tests (s) conventional gasoline 10.73 Example 1 10.12 Example 2 10.65 Example 3 10.32 Example 4 10.41
[0071] Table 3
[0072] As shown in Table 3, after four tests, each involving selecting a smooth, undisturbed road section, calculating the time required for the vehicle to accelerate from 0 km / h to 100 km / h after starting, and then calculating the average time after the four tests, the coal-based alcohol fuel prepared in the present invention has an average acceleration time that is shorter than that of conventional gasoline, indicating that its power performance is superior to that of conventional gasoline. Example 1 has the best power performance, achieving a 106% acceleration.
[0073] Table 4 shows the emission performance test results of the coal-based alcohol fuels prepared in Examples 1-4 of the present invention and traditional gasoline.
[0074]
[0075] Table 4
[0076] ASM5025 represents the control standard for exhaust pollutant emissions under steady-state conditions. 90, 0.5, and 700 represent the national standards for HC, CO, and NO, respectively. As shown in Table 4, the coal-based alcohol fuels prepared in Examples 1-4 of the present invention exhibit comparable CH, CO, and NO emissions to conventional gasoline, far exceeding national emission standards. This demonstrates that the coal-based alcohol fuels prepared in this application are environmentally friendly and can replace conventional gasoline.
[0077] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.
Claims
1. A coal-based alcohol fuel, characterized in that: The coal-based alcohol fuel comprises: 15%-23% methanol, 5%-9% polyol light components, 12%-20% coal tar hydrogenated gasoline component oil, 17%-28% isooctane and 32%-45% pyrolysis gasoline light components.
2. The coal-based alcohol fuel according to claim 1, characterized in that The coal-based alcohol fuel comprises: 18% methanol, 7.5% polyol light components, 15% coal tar hydrogenated gasoline component oil, 22% isooctane and 37.5% pyrolysis gasoline light components.
3. The coal-based alcohol fuel according to claim 1, characterized in that The purity of the methanol and isooctane is not less than 99.5%, the light component of the polyol is a C4-C8 mixed alcohol, the coal tar hydrogenated gasoline component oil is a component oil with a dry point below 130°C obtained by a hydrogenation process of coal tar; and the light component of the pyrolysis gasoline is a component of pyrolysis gasoline with a dry point below 120°C.
4. A method for preparing the coal-based alcohol fuel according to any one of claims 1 to 3, characterized in that: The preparation method comprises: A certain proportion of pH regulating liquid is added to the polyol according to the acidity, and then the first distillation is performed to obtain the light component of the polyol; Mixing the polyol light component and coal tar hydrogenated gasoline component oil, and performing azeotropic dehydration treatment to obtain a first product; Performing a second distillation cut on the pyrolysis gasoline to obtain a light component of the pyrolysis gasoline; At normal temperature and pressure, the first product and methanol are sequentially added to a reactor, stirred for a first time, and then the pyrolysis gasoline light component is added and stirred for a second time. Finally, isooctane is added and stirred for a third time, and the mixture is allowed to stand for a fourth time. After filtering, the coal-based alcohol-based fuel is obtained. The coal-based alcohol-based fuel comprises: 15%-23% of methanol, 5%-9% of polyol light components, 12%-20% of coal tar hydrogenated gasoline component oil, 17%-28% of isooctane, and 32%-45% of pyrolysis gasoline light components.
5. The preparation method according to claim 4, characterized in that The distillation range of the first distillation cut is less than 150°C.
6. The preparation method according to claim 4, characterized in that The conditions of the azeotropic dehydration treatment are specifically: temperature 88° C.-95° C., time 100 min-150 min.
7. The preparation method according to claim 4, characterized in that The distillation range of the second distillation cut is less than 130°C.
8. The preparation method according to claim 4, characterized in that The first time is 10 minutes to 20 minutes, the second time is 10 minutes to 20 minutes, the third time is 20 minutes to 40 minutes, and the fourth time is 36 hours to 72 hours.
9. The preparation method according to claim 4, characterized in that The filter cloth size is 10000 mesh.
10. Use of the coal-based alcohol fuel according to any one of claims 1 to 3 or the coal-based alcohol fuel prepared by the preparation method according to any one of claims 4 to 9, characterized in that: The coal-based alcohol fuel is used in spark-ignition internal combustion engines.