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research-article

Diesel fuel multiple injection effects on emission characteristics of diesel engine mixed ammonia gas into intake air

[+] Author and Article Information
Yoichi Niki

Chief researcher, Power and Energy System Research Group, Marine Environment and Engine System Department, National Institute of Maritime, Port and Aviation Technology, Mitaka, Tokyo, 1810004, Japan
niki@nmri.go.jp

Yoshifuru Nitta

Researcher, Member of ASME, Power and Energy System Research Group, Marine Environment and Engine System Department, National Institute of Maritime, Port and Aviation Technology, Mitaka, Tokyo, 1810004, Japan
nitta@nmri.go.jp

Hidenori Sekiguchi

Senior researcher, Power and Energy System Research Group, Marine Environment and Engine System Department, National Institute of Maritime, Port and Aviation Technology, Mitaka, Tokyo, 1810004, Japan
sekiguchi@nmri.go.jp

Koichi Hirata

Group leader, Power and Energy System Research Group, Marine Environment and Engine System Department, National Institute of Maritime, Port and Aviation Technology, Mitaka, Tokyo, 1810004, Japan
khirata@nmri.go.jp

1Corresponding author.

ASME doi:10.1115/1.4042507 History: Received February 07, 2017; Revised January 11, 2019

Abstract

The use of NH3 as an alternative fuel for internal combustion engines has been focused, because NH3 is known as a H2 carrier and its combustion does not produce CO2 causing global warming. There are some reports that unburned NH3 and N2O appear in exhaust gas, when NH3 is used as a fuel internal combustion engines. NH3 has toxic and N2O is one of the greenhouse gases. These emissions should be reduced. It has been also pointed out that exhaust gas after treatments and/or injection strategies can be effective to reduce these emissions. In this study, NH3 combustion processes in the diesel engine were investigated from the experimental results. Based on the investigations, a pilot or post injection was conducted to reduce emissions of NH3 and N2O. In this paper, it is shown firstly the experimental results of the combustion and exhaust emission characteristics on the conventional diesel engine mixed NH3 gas into intake air. NH3 and N2O emissions are then verified by analyzing the exhaust gas. Next, NH3 combustion processes in the diesel engine are considered from the experimental results. It reports on the effects of a pilot and post diesel fuel injection on NH3 and N2O production processes. Finally, the experimental results suggest that the multiple injections can be one of the methods to reduce NH3 emissions without N2O production as side effect.

Copyright (c) 2019 by ASME
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