用乙烯添加剂增强的生物气-柴油双燃料发动机的性能和排放分析
Menelik Walle1, Kumlachew Yeneneh1, Gadisa Sufe2
1Department of Motor Vehicle Engineering, College of Engineering, Ethiopian Defence University, P.O. Box 1041, Bishoftu 1041, Ethiopia.
ACS omega
|July 29, 2025
概括
这项研究提高了使用乙烯 (DEE) 作为燃烧增强剂的沼气-柴油双燃料发动机的性能. 通过2L/分钟的生物气流量和5%的DEE混合物获得了最佳结果,提高了效率并减少了排放.
科学领域:
- 可再生能源工程可再生能源工程
- 燃烧科学 燃烧科学
- 环境工程 环境工程
背景情况:
- 全球日益增长的能源需求和气候变化需要可持续的替代燃料.
- 来自有机废物的沼气提供碳中和能源,但具有诸如直接使用柴油发动机的低能量密度等局限性.
- 双燃料发动机为将生物气等可再生燃料融入现有基础设施提供了一个途径.
研究的目的:
- 研究在双燃料模式下运行的柴油发动机中使用沼气的可行性.
- 评估二甲基以太 (DEE) 作为燃烧增强剂对发动机性能和排放的影响.
- 优化生物气流量和DEE混合物以提高效率和减少环境影响.
主要方法:
- 发动机性能和排放量在双燃料运行下的四冲程单柴油发动机中进行了评估.
- 一个定制的Venturi风格的生物气空气混合器使用ANSYS Fluent CFD模拟进行了优化.
- 实验在每分钟1500转时进行,负载不同,生物气流速 (2,4,6 L/min) 和DEE混合比率 (5,10,15%) 不同.
主要成果:
- 生物气双燃料运行减少了NOx排放,但由于生物气的特性增加了HC和CO排放.
- 添加乙烯可以改善点火,燃烧效率和发动机整体性能.
- 最佳条件 (2L/分钟生物气,5%DEE) 产生了提高制动热效率 (BTE) 和降低制动特定燃油消耗 (BSFC) 的最佳平衡.
结论:
- 乙乙有效地提高了双燃料柴油发动机中的沼气燃烧.
- 优化的DEE-生物气-柴油混合物为交通和发电领域的可持续能源整合提供了可行的战略.
- 这种方法证明了在现有的柴油发动机技术中利用可再生生物气的实际途径.
相关概念视频
01:27Otto and Diesel Cycle
2.1K
An Otto engine is a four-stroke engine that uses a mixture of gasoline and air as the working fuel. The fuel is injected into the cylinder, and the piston is moved completely down so that the cylinder is at maximum volume. By moving the piston up, adiabatic compression takes place. The spark plug ignites the gasoline-air mixture, and the burning fuel adds heat to the system at a constant volume. The heated mixture expands adiabatically and gets further cooled by exhausting heat, and this cyclic...
2.1K
01:20Internal Combustion Engine
1.7K
The internal combustion engine is a heat engine that uses the byproducts of combustion as the working fluid instead of using a heat transfer medium to transfer heat. The combustion is done in a way that produces high-pressure combustion products that can be expanded through a turbine or piston to create work. Internal combustion engines can again be categorized into three kinds: (1) spark ignition gasoline engines, most commonly used in automobiles, (2) compression ignition diesel engines that...
1.7K
01:19Turnover Number and Catalytic Efficiency
10.7K
The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion....
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion....
10.7K