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关于非公路甲醇/柴油双燃料发动机的性能和排放特征的实验研究,在满载时配备后处理系统

Yan Liu¹, Junheng Liu¹, Qian Ji¹

¹School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang, 212013, China.

Journal of environmental management

|February 10, 2025

概括

甲醇/柴油双燃料发动机的燃油效率提高了7%,但增加了碳化合物和一氧化碳. 后处理系统有效地减少氧化和颗粒物,尽管选择性催化降低效率随发动机转速而变化.

科学领域:

燃烧发动机的使用方法
其他替代燃料其他替代燃料
排放控制技术排放控制技术

背景情况:

农业发动机通常依赖柴油燃料,导致大量排放.
双燃料燃烧模式,如甲醇/柴油,提供了提高效率和减少特定污染物的潜力.
了解双燃料运行和废气后处理系统之间的相互作用对于减少排放至关重要.

研究的目的:

为了研究农业发动机中甲醇/柴油双燃料预混合模式的排放特性.
在双燃料运行下评估废气后处理系统 (DOC,CDPF,SCR) 的性能.
为了澄清发动机转速对排放元件和后处理系统效率的影响.

主要方法:

仅使用柴油和甲醇/柴油双燃料模式的排放特征的实验分析.
柴油氧化催化剂 (DOC),催化柴油颗粒过器 (CDPF) 和选择性催化减少 (SCR) 系统的性能评估.
在各种发动机转速时测量制动特定燃油消耗 (BSFC),碳化合物 (HC),一氧化碳 (CO),氧化 (NOx),颗粒物 (PM),甲,甲醇和二氧化 (N2O).

主要成果:

双燃料模式实现了7%较低的最大BSFC,与仅柴油模式相比.
在双燃料模式下,HC和CO排放量显著增加,随着发动机转速而升级.
在双燃料模式下,NOx和PM排放量分别减少了多达53%和57%.
甲和甲醇排放量随着发动机转速的增加而急剧增加.
对于CO和HC,DOC的效率超过95%;CDPF保持了超过98%的PM捕获效率.
随着发动机转速从2000rpm增加到2400rpm,SCR NOx转换效率从95.6%降至37.1%,而N2O排放量增加.

结论:

农业发动机的甲醇/柴油双燃料运行提供了燃油经济的好处,但需要仔细管理HC和CO排放.
现有的后处理系统在PM和CO/HC方面表现出高效率,但SCR性能对发动机转速高度敏感.
优化后处理系统协作控制对于在不同运行条件下有效减少甲醇/柴油双燃料发动机的排放至关重要.

关键词:

催化技术是一种催化技术.氧化二氧化物是什么甲甲排放的排放形式一致的充电压缩点火点火器.不完整的燃烧产品不完全的燃烧产品甲醇燃料是一种甲醇燃料.

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