A combustion aid suitable for methanol fuel, its preparation method and application

Abstract

This invention belongs to the field of combustion aid preparation technology, specifically relating to a combustion aid suitable for methanol fuel, its preparation method, and its application. By mass parts, the combustion aid of this invention comprises the following raw materials: 40-65 parts polyetheramine, 5-10 parts biomass oil, 1-3 parts glycerol, 3-6 parts diethyl ether, 3-6 parts dibutyl oxalate, and 1-2 parts n-butanol; the biomass oil is prepared from modified coconut shell powder, Chlorella powder, and Schizochytrium powder; by mixing the above core components, the inherent defects in the methanol fuel combustion process are systematically solved; that is, the combustion aid provided by this invention not only has good stability but also effectively improves the corrosion resistance of methanol fuel, enhances the combustion performance of methanol fuel, and makes methanol fuel more environmentally friendly and practical.

Description

Technical Field

[0001] This invention belongs to the field of combustion aid preparation technology, specifically relating to a combustion aid suitable for methanol fuel, its preparation method, and its application. Background Technology

[0002] Methanol fuel refers to a liquid fuel system that uses methanol as the main component, blended with gasoline, diesel, or other hydrocarbon fuels in a certain proportion, or used directly as pure methanol. Although methanol fuel has significant advantages such as wide availability and controllable cost, its extremely low cetane number (only about 3-5) leads to an excessively long ignition delay and difficulty in ignition in compression ignition engines. Furthermore, its insufficient energy density directly restricts vehicle power output and driving range. Additionally, methanol's high latent heat of vaporization and slow laminar flame propagation speed result in poor low-temperature starting performance and a prolonged combustion duration, easily leading to incomplete combustion, reduced efficiency, and even worsened emissions.

[0003] Existing technologies often improve the combustion performance of methanol fuel by preparing beneficial additives. For example, Chinese patent CN 118725923 A describes an environmentally friendly methanol fuel and its preparation method, which mixes methanol, ammonia, low-carbon alcohols, hydrogen peroxide, composite nanoparticles, antifreeze, preservatives, ethylene glycol monobutyl ether, ethyl tert-butyl ether, sweet orange peel oil, catechol, and bifunctional additives to ensure more complete combustion of the methanol fuel during use, resulting in good stability, octane rating, antioxidant properties, and lubricity. Another example is Chinese patent CN 105647596 A, which discloses a methanol-coal-based blended fuel to improve the calorific value of methanol fuel. Specifically, it blends methanol, medium- and low-temperature coal tar, light and heavy tar, and fuel additives, using coal-based byproducts and methanol as raw materials to produce new methanol-coal-based fuel products of different specifications, achieving efficient fuel utilization and improving the storage and transportation hazards of existing fuels. However, there are currently no reports on improving the combustion performance of methanol fuel by preparing combustion aids. Summary of the Invention

[0004] The purpose of this invention is to provide a combustion aid suitable for methanol fuel, its preparation method and application. The preparation method is simple and can improve the combustion performance of methanol fuel.

[0005] This invention provides a combustion aid suitable for methanol fuel, comprising the following raw materials in parts by weight: 40-65 parts of polyetheramine, 5-10 parts of biomass oil, 1-3 parts of glycerol, 3-6 parts of diethyl ether, 3-6 parts of dibutyl oxalate, and 1-2 parts of n-butanol. The biomass oil is prepared from modified coconut shell powder, Chlorella powder, and Schizochytrium powder.

[0006] Preferably, the mass ratio of the modified coconut shell powder, Chlorella powder, and Schizochytrium powder is 40-50:10-20:3-5.

[0007] Preferably, by weight, it comprises the following raw materials: 50 parts polyetheramine, 10 parts biomass oil, 2 parts glycerol, 3 parts diethyl ether, 4 parts dibutyl oxalate, and 1 part n-butanol. When preparing biomass oil, the mass ratio of the modified coconut shell powder, Chlorella powder, and Schizochytrium powder is 40:10:5.

[0008] Preferably, the modified coconut shell powder is prepared by mixing crushed coconut shell, *Procambarus chrysospora* and water in a mass ratio of 10:0.3-0.5:10-15 and then performing aerobic fermentation and drying to obtain modified coconut shell powder.

[0009] Preferably, the temperature for aerobic fermentation is 30-35℃, and the time is 2-3 days; The effective viable count of *Phanerochaete chrysosporium* is ≥1×10⁻⁶. 8 cfu / g; The modified coconut shell powder has a moisture content of 5%-8%.

[0010] This invention provides a method for preparing the combustion aid described in the above technical solution, comprising the following steps: (1) Modified coconut shell powder, Chlorella powder and Schizochytrium powder were mixed and then freeze-dried and modified at high temperature to obtain pretreated raw materials; (2) The pretreated raw materials are pyrolyzed, cooled and hydrogenated to obtain biomass oil; (3) Mix polyetheramine, biomass oil, glycerol, ether, dibutyl oxalate and n-butanol evenly to obtain a combustion aid.

[0011] Preferably, in step (1), the freeze-drying temperature is -20 to -10°C and the time is 1-2 hours; The high-temperature modification is performed at a temperature of 80-100℃ for 10-30 minutes.

[0012] Preferably, in step (2), pyrolysis is carried out under nitrogen conditions, and the pyrolysis temperature is 220-250℃ and the time is 3-5h; When cooling, cool to 25-30℃.

[0013] Preferably, in step (2), the temperature of hydrogenation is 350-450℃ and the pressure is 10-13MPa.

[0014] The present invention provides the application of the combustion aid described in the above technical solution in reducing the combustion rate and / or increasing the calorific value of fuel.

[0015] Beneficial effects: This invention provides a combustion aid suitable for methanol fuel, comprising, by mass parts: 40-65 parts of polyetheramine, 5-10 parts of biomass oil, 1-3 parts of glycerol, 3-6 parts of diethyl ether, 3-6 parts of dibutyl oxalate, and 1-2 parts of n-butanol; wherein the biomass oil is prepared from modified coconut shell powder, Chlorella powder, and Schizochytrium powder.

[0016] This invention systematically solves the inherent defects in the combustion process of methanol fuel and significantly improves its overall performance by mixing components such as polyetheramine, biomass oil, glycerol, diethyl ether, dibutyl oxalate, and n-butanol. After fermentation pretreatment, the lignin structure of coconut shell powder is directionally degraded, significantly increasing the carbon-to-oxygen ratio, reducing heavy components in the pyrolysis oil, and enhancing its miscibility with methanol. Chlorella powder is rich in triglycerides, while Schizochytrium powder is mainly composed of high-purity DHA oil. The biomass oil prepared by combining these two has a high calorific value and good fluidity, effectively compensating for the insufficient calorific value of methanol and improving the power output during combustion. Diethyl ether and n-butanol, as co-solvents, not only significantly improve the miscibility between components and prevent system stratification, but also lower the flash point of methanol and improve ignition performance at low temperatures. Dibutyl oxalate and glycerol work synergistically; the former can suppress knocking during combustion and stabilize the flame morphology, while the latter can regulate the combustion rate, buffer the impact of violent combustion, and reduce the formation of corrosive products at high temperatures. Polyetheramine, as a detergent and dispersant, can effectively inhibit the formation of carbon deposits on fuel injectors, maintain smooth fuel flow, and reduce pollutant emissions caused by incomplete combustion. Therefore, the combustion aid prepared in this invention not only improves the corrosion resistance of methanol fuel but also exhibits good stability, giving methanol fuel superior environmental friendliness and practicality. Detailed Implementation

[0017] Unless otherwise specified, all raw materials used in this invention are conventionally purchased.

[0018] Purchased from an online store (Shanghai Biotechnology Network); To further illustrate the present invention, the solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0019] Example 1 A method for preparing a combustion aid suitable for methanol fuel, comprising the following steps: (1) Modified coconut shell powder Crushed coconut shells (particle size <0.1cm), *Phanerochaete chrysosporium* (… Phanerochaete chrysosporium, The effective viable bacteria count is 1×10 8The mixture of CFU / g and water was prepared at a mass ratio of 10:0.3:10 and fermented aerobically at 35°C for 3 days to obtain the fermented product. The fermented product was then dried at 35°C to obtain modified coconut shell powder with a moisture content of 5%. (2) Biomass oil The modified coconut shell powder, Chlorella powder and Schizochytrium powder were mixed evenly at a mass ratio of 40:10:5. The mixed powder was freeze-dried at -10℃ for 1 hour and then modified at 80℃ for 10 minutes to obtain the pretreated raw material. Under nitrogen atmosphere, the pretreated raw material was pyrolyzed at 220°C for 5 hours and then cooled to 30°C. The cooled raw material was then subjected to hydrogenation at 350°C and 10MPa to obtain biomass oil. (3) Mix 50 parts of polyetheramine, 10 parts of the above-mentioned biomass oil, 2 parts of glycerol, 3 parts of ether, 4 parts of dibutyl oxalate and 1 part of n-butanol by mass to obtain a combustion aid.

[0020] Example 2 A method for preparing a combustion aid suitable for methanol fuel, comprising the following steps: (1) Modified coconut shell powder Crushed coconut shells (particle size <0.1cm), *Phanerochaete chrysosporium* (… Phanerochaete chrysosporium, The effective viable bacteria count is 1×10 8 The mixture of CFU / g and water was prepared at a mass ratio of 10:0.3:15 and fermented aerobically at 35°C for 3 days to obtain the fermented product. The fermented product was then dried at 35°C to obtain modified coconut shell powder with a moisture content of 8%. (2) Biomass oil The modified coconut shell powder, Chlorella powder and Schizochytrium powder were mixed evenly at a mass ratio of 50:10:5. The mixed powder was freeze-dried at -10℃ for 1 hour, and then modified at 80℃ for 10 minutes to obtain the pretreated raw material. Under nitrogen atmosphere, the pretreated raw material was pyrolyzed at 220°C for 5 hours and then cooled to 30°C. The cooled raw material was then subjected to hydrogenation at 350°C and 10MPa to obtain biomass oil. (3) Mix 65 parts of polyetheramine, 5 parts of biomass oil, 3 parts of glycerol, 6 parts of ether, 6 parts of dibutyl oxalate and 2 parts of n-butanol by mass to obtain a combustion aid.

[0021] Comparative Example 1 A method for preparing a combustion aid suitable for methanol fuel, comprising the following steps: (1) Biomass oil Coconut shell powder, Chlorella powder and Schizochytrium powder were mixed evenly in a mass ratio of 40:10:5. The mixed powder was freeze-dried at -10℃ for 1 hour and then modified at 80℃ for 10 minutes to obtain the pretreated raw material. Under nitrogen atmosphere, the pretreated raw material was pyrolyzed at 220°C for 5 hours and then cooled to 30°C. The cooled raw material was then subjected to hydrogenation at 350°C and 10MPa to obtain biomass oil. (2) Same as step (3) in Example 1.

[0022] Comparative Example 2 A method for preparing a combustion aid suitable for methanol fuel, comprising the following steps: (1) Modified coconut shell powder: prepared using the same method as in Example 1; (2) Biomass oil Modified coconut shell powder was freeze-dried at -10℃ for 1 hour, and then modified at 80℃ for 10 minutes to obtain the pretreated raw material. Under nitrogen atmosphere, the pretreated raw material was pyrolyzed at 220°C for 5 hours and then cooled to 30°C. The cooled raw material was then subjected to hydrogenation at 350°C and 10MPa to obtain biomass oil. (3) is the same as step (3) in Example 1.

[0023] Comparative Example 3 A method for preparing a combustion aid suitable for methanol fuel, comprising the following steps: (1) Biomass oil Chlorella powder and Schizochytrium powder were mixed evenly at a mass ratio of 2:1, and the mixed powder was freeze-dried at -10℃ for 1 hour, and then modified at 80℃ for 10 minutes to obtain the pretreated raw material. Under nitrogen atmosphere, the pretreated raw material was pyrolyzed at 220°C for 5 hours and then cooled to 30°C. The cooled raw material was then subjected to hydrogenation at 350°C and 10MPa to obtain biomass oil. (2) Same as step (3) in Example 1.

[0024] Comparative Example 4 A method for preparing a combustion aid suitable for methanol fuel, comprising the following steps: (1) Modified coconut shell powder: prepared using the same method as in Example 1; (2) Biomass oil The modified coconut shell powder, Chlorella powder and Schizochytrium powder were mixed evenly in a mass ratio of 40:10:5. The mixture was pyrolyzed at 220°C for 5 hours under nitrogen atmosphere and cooled to 30°C. The cooled mixture was then subjected to hydrogenation at 350°C and 10MPa to obtain biomass oil. (3) is the same as step (3) in Example 1.

[0025] Comparative Example 5 A method for preparing a combustion aid suitable for methanol fuel, comprising the following steps: (1) Modified coconut shell powder: prepared using the same method as in Example 1; (2) Biomass oil The modified coconut shell powder, Chlorella powder and Schizochytrium powder were mixed evenly in a mass ratio of 10:10:20. The mixed powder was freeze-dried at -10℃ for 1 hour and then modified at 80℃ for 10 minutes to obtain the pretreated raw material. Under nitrogen atmosphere, the pretreated raw material was pyrolyzed at 220°C for 5 hours and then cooled to 30°C. The cooled raw material was then subjected to hydrogenation at 350°C and 10MPa to obtain biomass oil. (3) is the same as step (3) in Example 1.

[0026] Comparative Example 6 A method for preparing a combustion aid suitable for methanol fuel, comprising the following steps: The only difference from Example 1 is that in Comparative Example 6, rice straw powder was used instead of coconut shell powder in Example 1.

[0027] Comparative Example 7 A method for preparing a combustion aid suitable for methanol fuel, comprising the following steps: (1) Modified coconut shell powder: Same as step (1) in Example 1; (2) Biomass oil: Same as step (2) in Example 1; (3) Mix 30 parts of polyetheramine, 20 parts of the above-mentioned biomass oil, 2 parts of glycerol, 3 parts of ether, 4 parts of dibutyl oxalate and 1 part of n-butanol by mass to obtain a combustion aid.

[0028] Stability verification The combustion aids prepared in Examples 1-2 and Comparative Examples 1-7 were stored at 25°C to observe the stability of each product.

[0029] The results showed that the combustion aids prepared in Examples 1-2 and Comparative Examples 1-7 did not separate into layers when stored at 25°C for 24 months.

[0030] Cleanliness performance verification Referring to the method in GB / T 37322-2019 "Evaluation of Gasoline Detergents: Simulation Test Method for Gasoline Engine Intake Valve Deposits", the cleaning performance of the combustion aids prepared in Examples 1-2 and Comparative Examples 1-7 was tested: 300 mL of methanol gasoline M15 was taken as the test sample, and the above-mentioned combustion aids were added at an addition amount of 500 mg / L. The oil sample without added combustion aids was used as a blank control. The temperature of the deposit collector was 180℃. The cleaning performance evaluation results are shown in Table 1.

[0031] Table 1. Cleaning performance results of different combustion aids

[0032] As can be seen from the data in Table 1, compared with the comparative example, the combustion aid prepared in the example has a lower deposit quality, which indicates that it can make methanol gasoline M15 burn more completely, the fuel system cleaner, extend engine life, and reduce environmental pollution.

[0033] Corrosion and exhaust gas content test Based on the data in Table 1, the combustion aids prepared in Examples 1-2 and Comparative Examples 3-5 were selected for testing. Specifically, each of the above combustion aids was added to methanol gasoline M15 at an addition amount of 500 mg / L as methanol fuel (and each methanol fuel was labeled according to the combustion aid as Example 1-2 and Comparative Examples 3-5). The above methanol fuels were used in cars of the same model. Each methanol fuel was a treatment, and each treatment was repeated 5 times in parallel. Each car was driven for 50,000 kilometers under the same conditions, and the corrosion status of the fuel system and engine was observed and statistically analyzed. The results are shown in Table 2.

[0034] Table 2 Corrosion status of different treatments

[0035] The exhaust gas content of the above-mentioned cars was tested (average value), and the results are shown in Table 3.

[0036] Table 3. Exhaust gas content under different treatments

[0037] Based on the data in Table 3, the combustion aid prepared in the examples significantly improves the performance of methanol fuel. Specifically, the combustion aid effectively inhibits the formation of incomplete methanol oxidation products, reducing the risk of acidic substances corroding the engine. Simultaneously, the combustion aid optimizes combustion efficiency, resulting in more complete and stable combustion. Benzene and sulfur content are also significantly reduced, with sulfur content nearing zero, greatly reducing exhaust toxicity and minimizing damage to the three-way catalytic converter. Therefore, the combustion aid prepared in the examples improves the combustion efficiency of methanol fuel, reduces corrosiveness, and enhances the environmental friendliness and practicality of methanol fuel.

[0038] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. People can obtain other embodiments based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A combustion aid suitable for methanol fuel, characterized in that, The product comprises the following raw materials by weight: 40-65 parts polyetheramine, 5-10 parts biomass oil, 1-3 parts glycerol, 3-6 parts diethyl ether, 3-6 parts dibutyl oxalate, and 1-2 parts n-butanol. The biomass oil is prepared from modified coconut shell powder, Chlorella powder, and Schizochytrium powder.

2. The combustion aid according to claim 1, characterized in that, The mass ratio of the modified coconut shell powder, Chlorella powder, and Schizochytrium powder is 40-50:10-20:3-5.

3. The combustion aid according to claim 1 or 2, characterized in that, The ingredients, by weight, include the following: 50 parts polyetheramine, 10 parts biomass oil, 2 parts glycerol, 3 parts diethyl ether, 4 parts dibutyl oxalate, and 1 part n-butanol. When preparing biomass oil, the mass ratio of the modified coconut shell powder, Chlorella powder, and Schizochytrium powder is 40:10:

5.

4. The combustion aid according to claim 1 or 2, characterized in that, The modified coconut shell powder is prepared by mixing crushed coconut shell, *Procambarus chrysospora* and water in a mass ratio of 10:0.3-0.5:10-15, followed by aerobic fermentation and drying to obtain modified coconut shell powder.

5. The combustion aid according to claim 4, characterized in that, The temperature for aerobic fermentation is 30-35℃, and the time is 2-3 days. The effective viable count of *Phanerochaete chrysosporium* is ≥1×10⁻⁶. 8 cfu / g; The modified coconut shell powder has a moisture content of 5%-8%.

6. A method for preparing the combustion aid according to any one of claims 1-5, characterized in that, Includes the following steps: (1) Modified coconut shell powder, Chlorella powder and Schizochytrium powder were mixed and then freeze-dried and modified at high temperature to obtain pretreated raw materials; (2) The pretreated raw materials are pyrolyzed, cooled and hydrogenated to obtain biomass oil; (3) Mix polyetheramine, biomass oil, glycerol, ether, dibutyl oxalate and n-butanol evenly to obtain a combustion aid.

7. The preparation method according to claim 6, characterized in that, In step (1), the freeze-drying temperature is -20 to -10°C, and the time is 1-2 hours; The high-temperature modification is performed at a temperature of 80-100℃ for 10-30 minutes.

8. The preparation method according to claim 6, characterized in that, In step (2), pyrolysis is carried out under nitrogen atmosphere at a temperature of 220-250℃ for 3-5 hours. When cooling, cool to 25-30℃.

9. The preparation method according to claim 6, characterized in that, In step (2), the temperature for hydrogenation is 350-450℃ and the pressure is 10-13MPa.

10. The application of the combustion aid according to any one of claims 1-5 in improving the combustion performance of methanol fuel.

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