Experimental Study on Emission Characteristics of Diesel/Methanol Dual-Fuel Engine Coupled with an After-Treatment System

被引：0

作者：

Chen Z. ^{[1
]}

Liu J. ^{[1
]}

Sun P. ^{[1
]}

Ji Q. ^{[1
]}

Huang H. ^{[2
]}

机构：

[1] School of Automotive and Traffic Engineering, Jiangsu University, Jiangsu, Zhenjiang

[2] School of Traffic Engineering, Nanjing Vocational University of Industry Technology, Nanjing

来源：

Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2022年 / 56卷 / 12期

关键词：

aftertreatmcnt system; dual-fuel engine; emission characteristic; exhaust temperature; methanol fuel;

D O I：

10.7652/xjtuxb202212002

中图分类号：

学科分类号：

摘要：

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, HC, NO? and HCHO in exhaust gas increases together with the n(NO2)/n(NOx) 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(NO2)/n(NOx) 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 N2O emissions. However, adding methanol can reduce the formation of NzO to a certain extent. The research results may provide useful data for realizing emission control in the dual-fuel combustion mode. © 2022 Xi'an Jiaotong University. All rights reserved.

引用

页码：12 / 22

页数：10

共 26 条

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