Effects of Hydrogen-Rich Reformed Gas on the Combustion Reaction Process in a Natural Gas Engine

被引：0
|
作者：
Zhang H. [1 ]
Zhang Z. [1 ]
Long Y. [1 ]
Li G. [1 ]
机构：
[1] School of Energy and Power Engineering, Wuhan University of Technology, Wuhan
来源：
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2021年 / 55卷 / 09期
关键词：
Chemical kinetics analysis; Combustion reaction process; Natural gas engine; Reformed exhaust gas recirculation;
D O I：
10.7652/xjtuxb202109017
中图分类号：
学科分类号：
摘要：
To investigate the regulation mechanism of reformed exhaust gas recirculation (REGR) technology on the combustion and emission of natural gas engines, a numerical simulation study on the combustion process of the spark-ignition natural gas engine was conducted. The results show that the effects of hydrogen-rich reformed gas addition on the combustion process of natural gas engines are inverse to that of increasing excess air coefficient. Specifically, the ignition time of fuel advances by 1.42° and the combustion duration is shortened with the increase of the reformed gas addition rate(REGR rate). However, with the increase of excess air coefficient, the in-cylinder pressure and the heat release rate both decrease, and also, the ignition time is delayed by 2.24°. When REGR rate increases by 16%, the total hydrocarbon (THC) and NOx emission are reduced by 26.98% and 62.52%, respectively; but the engine power will be reduced by 9.52%. Thereout, the influences of REGR rate on the fuel combustion process and pollutant formation process of liquefied natural gas engines were further analyzed from the perspective of chemical kinetics. It shows that the proportion of OH radical participating in CH4 consumption reaction increases with the REGR rate. Consequently, the combustion phase is advanced by accelerating the elementary reaction rate, and the unburned HC emission is reduced as well. © 2021, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.
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页码：152 / 160
页数：8
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