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research-article

Emissions Characteristics of Marine Diesel Engine Intaking Exhaust Gas of Lean Burn Gas Engine

[+] Author and Article Information
Yoshifuru Nitta

National Institute of Maritime, Port and Aviation Technology, 6-38-1, Shinkawa, Mitaka, Tokyo, 181-004, Japan
nitta@nmri.go.jp

Dong-Hoon Yoo

National Institute of Maritime, Port and Aviation Technology (Former), 6-38-1, Shinkawa, Mitaka, Tokyo, 181-004, Japan
komorebi023@gmail.com

Sumito Nishio

National Institute of Maritime, Port and Aviation Technology, 6-38-1, Shinkawa, Mitaka, Tokyo, 181-004, Japan
nishio@nmri.go.jp

Yasuhisa Ichikawa

National Institute of Maritime, Port and Aviation Technology, 6-38-1, Shinkawa, Mitaka, Tokyo, 181-004, Japan
ichikawa@nmri.go.jp

Koichi Hirata

National Institute of Maritime, Port and Aviation Technology, 6-38-1, Shinkawa, Mitaka, Tokyo, 181-004, Japan
khirata@nmri.go.jp

Yudai Yamasaki

Department of Mechanical Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyou-ku, Tokyo, 113-8656, Japan
yudai_y@fiv.t.u-tokyo.ac.jp

1Corresponding author.

ASME doi:10.1115/1.4037868 History: Received December 11, 2016; Revised July 21, 2017

Abstract

The need for reductions of nitrogen oxides (NOx), sulfur oxides (SOx) and carbon dioxide (CO2) emissions have been acknowledged on the global level. However, it is difficult to meet the strengthened emissions regulations using the conventional marine diesel engines. Therefore lean burn gas engines have been recently attracting attention in the maritime industry. Because they use natural gas as fuel and can simultaneously reduce both NOx and CO2 emissions. On the other hand, since methane is the main component of natural gas, the slipped methane, which is the unburned methane emitted from the lean burn gas engines might have a potential impact on global warming. The authors have proposed a combined exhaust gas recirculation (C-EGR) system to reduce the slipped methane from the gas engines and NOx from marine diesel engines by providing the exhaust gas from lean burn gas engine to the intake manifold of the marine diesel engine using a blower. Since the exhaust gas from the gas engine includes slipped methane, this system could reduce both the NOx from the marine diesel engine and the slipped methane from the lean burn gas engine. This paper introduces the details of the proposed C-EGR system, and presents the experimental results of emissions characteristics on the C-EGR system. As a result, it was confirmed that the C-EGR system attained more than 75 % reduction of the slipped methane in the intake gas. Additionally, the NOx emission from the diesel engine decreased with the effect of the EGR.

Copyright (c) 2017 by ASME
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