柴油/甲醇双燃料发动机耦合后处理系统的排放性能研究

陈旨明; 刘军恒; 孙平; 嵇乾; 黄河

doi:10.7652/xjtuxb202212002

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柴油/甲醇双燃料发动机耦合后处理系统的排放性能研究

专题新型燃料与燃烧过程优化 | 更新时间：2025-07-09

- 柴油/甲醇双燃料发动机耦合后处理系统的排放性能研究
- Experimental Study on Emission Characteristics of Diesel/Methanol Dual-Fuel Engine Coupled with an After-Treatment System
- 西安交通大学学报 2022年56卷第12期页码：12-22
- 作者机构：
  
  1. 江苏大学汽车与交通工程学院,江苏,镇江,212013
  2. 南京工业职业技术大学交通工程学院,南京,210046
- 作者简介：
  
  : 2022-04-25。作者简介: 陈旨明(1998—),男,硕士生
  刘军恒(通信作者),男,副教授。基金项目: 国家自然科学基金资助项目(51806086)
- 基金信息：
  
  : 2022-04-25。作者简介: 陈旨明(1998—),男,硕士生;刘军恒(通信作者),男,副教授。基金项目: 国家自然科学基金资助项目(51806086);江苏省自然科学基金资助项目(BK20200142);江苏省高等学校自然科学研究项目(21KJD 470002)
- DOI：10.7652/xjtuxb202212002
  中图分类号： TK421+.5
- 网络首发：2022-12-10，
  
  纸质出版：2022
- 稿件说明：
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陈旨明, 刘军恒, 孙平, 等. 柴油/甲醇双燃料发动机耦合后处理系统的排放性能研究[J]. 西安交通大学学报, 2022,56(12):12-22.

CHEN Zhiming, LIU Junheng, SUN Ping, et al. Experimental Study on Emission Characteristics of Diesel/Methanol Dual-Fuel Engine Coupled with an After-Treatment System[J]. 2022, 56(12): 12-22.
陈旨明, 刘军恒, 孙平, 等. 柴油/甲醇双燃料发动机耦合后处理系统的排放性能研究[J]. 西安交通大学学报, 2022,56(12):12-22. DOI： 10.7652/xjtuxb202212002.

CHEN Zhiming, LIU Junheng, SUN Ping, et al. Experimental Study on Emission Characteristics of Diesel/Methanol Dual-Fuel Engine Coupled with an After-Treatment System[J]. 2022, 56(12): 12-22. DOI： 10.7652/xjtuxb202212002.

摘要

为了实现压燃式发动机污染物的超低排放

在一台高压共轨柴油机上进行柴油/甲醇双燃料燃烧模式耦合后处理系统的排放特性研究。通过调节不同负荷下进气预混甲醇比例

分析了氧化催化转化器(DOC)、催化型颗粒物捕集器(CDPF)和选择性催化还原催化器(SCR)对柴油/甲醇双燃料发动机污染物排放的影响规律。结果表明:双燃料模式的排气温度降低

有效热效率在中低负荷时降低

在高负荷时增加; 随着甲醇比例的增加

排气中CO、HC、NO

和HCHO的体积分数增加

n(NO

)/n(NO

)显著提高

和碳烟的排放量明显降低。后处理系统工作特性受发动机负荷影响较大:在中低负荷时排气温度低

后处理系统对CO、HC和HCHO转换效率较低; 在高负荷时排气温度高

系统催化活性增强

各种排放物转换效率也大幅提高。双燃料模式下

DOC后端氧化升温明显

n(NO

)/n(NO

)经DOC后显著降低

而纯柴油模式下则呈相反趋势。在不同负荷下:CDPF对碳烟的平均捕集效率超过90%; SCR催化反应降低NO

的同时会导致N

O排放增加

甲醇的加入可在一定程度上减少N

O生成。研究结果可为实现双燃料燃烧模式的排放控制提供基础数据。

Abstract

This paper investigates the emission characteristics of a high-pressure common-rail diesel engine coupled with an aftertreatment system in the diesel/methanol dual-fuel combustion mode

aiming to achieve ultra-low emissions of compression-ignition engines. The effects of the diesel oxidation catalyst(DOC)

catalytic diesel particulate filter(CDPF)and selective

catalytic reduction(SCR)on pollutant emissions of the diesel/methanol dual-fuel engine are studied by adjusting the ratio of inlet premixed methanol under different loads. According to the results

the exhaust temperature drops in the dual-fuel mode and the effective thermal efficiency decreases under low and medium loads and increases under high loads. With the increase of methanol ratio

the volume fractions of CO

and HCHO in exhaust gas increases together with the n(NO

)/n(NO

)ratio while NO

and soot emissions significantly decrease. The after-treatment system is greatly affected by engine loads: Under low and medium loads

the exhaust temperature is low so is the efficiency in the conversion of CO

HC and HCHO; under high loads

the exhaust temperature increases and the catalytic activity in the system is enhanced

leading to remarkable increase in the conversion efficiency of various emissions. In the diesel/methanol dual-fuel combustion mode

there is significant temperature increase at the back end of the DOC and a remarkable drop of the n(NO

)/n(NO

)ratio. However

the opposite trend was observed in the diesel combustion mode. The average soot capture efficiency of CDPF is higher than 90% under different loads. The catalytic reaction of SCR leads to the decrease in NO

and increase in N

O emissions. However

adding methanol can reduce the formation of N

O to a certain extent. The research results may provide useful data for realizing emission control in the dual-fuel combustion mode.

关键词

Keywords

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