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Research Papers: Internal Combustion Engines

Evaluation of Emissions Characteristics of Marine Diesel Engine Intake of 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 181-0004, Japan
e-mail: nitta@nmri.go.jp

Dong-Hoon Yoo

National Institute of Maritime,
Port and Aviation Technology,
6-38-1, Shinkawa, Mitaka,
Tokyo 181-0004, Japan
e-mail: komorebi023@gmail.com

Sumito Nishio

National Institute of Maritime,
Port and Aviation Technology,
6-38-1, Shinkawa, Mitaka,
Tokyo 181-0004, Japan
e-mail: nishio@nmri.go.jp

Yasuhisa Ichikawa

National Institute of Maritime,
Port and Aviation Technology,
6-38-1, Shinkawa, Mitaka,
Tokyo 181-0004, Japan
e-mail: ichikawa@nmri.go.jp

Koichi Hirata

National Institute of Maritime,
Port and Aviation Technology,
6-38-1, Shinkawa, Mitaka,
Tokyo 181-0004, Japan
e-mail: khirata@nmri.go.jp

Yudai Yamasaki

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

1Corresponding author.

Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received December 11, 2016; final manuscript received July 21, 2017; published online October 10, 2017. Assoc. Editor: Eric Petersen.

J. Eng. Gas Turbines Power 140(2), 022802 (Oct 10, 2017) (8 pages) Paper No: GTP-16-1581; doi: 10.1115/1.4037868 History: Received December 11, 2016; Revised July 21, 2017

The need for reductions of nitrogen oxides (NOx), sulfur oxides (SOx), and carbon dioxide (CO2) emissions has been acknowledged on the global level. However, it is difficult to meet the strengthened emissions regulations by 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 simultaneously. 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 exhaust gas recirculation (EGR) system.

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Figures

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Fig. 1

Schematic diagram of C-EGR system

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Fig. 2

Schematic diagram of exhaust gas flow in C-EGR system

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Fig. 3

Relationship between measured and calculated CO2 concentration in merged exhaust gas. The diagonal line means calculated volume flow rate is equal to measured volume flow rate.

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Fig. 4

Relationships among EGR rate, cylinder pressure, fuel injection pressure, and HRR histories. Premixed phase is dominant at low load and diffusion combustion phase becomes dominant at high load, and midload exhibits the shift. The premixed and diffusion combustion phases thus shift with engine load.

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Fig. 5

Relationships between EGR rate, O2, and CO2 concentration in the intake manifold of the diesel engine. O2 concentration is decreased and CO2 concentration is increased with increasing EGR rate.

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Fig. 6

Relationships among EGR rate, NOx emission rate, CO emission rate, and FSN from the diesel engine. With increasing EGR rate, NOx reduction and particle as well as CO emission are tradeoff on each load condition.

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Fig. 7

Relationships among EGR rate, methane quantity including the intake gas and exhaust gas, and methane reduction rate of diesel engine. With increasing EGR, methane quantity including the intake gas and exhaust gas was increased, but methane reduction was increased on each load condition. With increasing load condition, methane reduction was decreased.

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Fig. 8

Relationship between the unburned methane emission per cycle and EGR rate on each load condition. The unburned methane emission per cycle is increased with increased load and EGR rate.

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