This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Reduction of Methane Slip from Gas Engines by O 2 Concentration Control using Gas Permeation Membrane
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 14, 2013 by SAE International in United States
Annotation ability available
With progression of so-called shale gas revolution, gas engines are expected as a strong substitute for diesel engines in marine fields, where strict emission regulations have been recently introduced. Thanks to the sulphur-free and low-carbon features of natural gas, gas engines emit much less CO2 and particulate matter than marine diesels burning heavy fuel oil. The premixed lean-burn gas engines, however, suffer two massive flaws. One is abnormal combustion called knocking and the other is a methane slip, which substantially means the unburned methane emitted into exhaust ports.
One of the methane slip sources is thought to be flame quenching inside dead volumes around a combustion chamber or inside a boundary layer near a cylinder wall. Only supportive measures like cutdown of crevice volume have been conducted against the unburned methane. The present study proposes novel and essential methane slip reduction for the first time using a gas permeation membrane, of which permeability to oxygen molecules excels the one to nitrogen molecules. The membrane inserted between a main compressor and a charge cooler helps to form uneven oxygen gradient inside a combustion chamber. After the feasibility check of the complicated charging system based on a one-dimensional engine simulator, the potential of the methane slip reduction is successfully examined through CFD simulation with detailed chemical analysis.
CitationTajima, H. and Tsuru, D., "Reduction of Methane Slip from Gas Engines by O2 Concentration Control using Gas Permeation Membrane," SAE Technical Paper 2013-01-2618, 2013, https://doi.org/10.4271/2013-01-2618.
- Fujita Katsuya et al. Development of Selective Catalytic Reduction for Low-speed Marine Diesel Engines -Super-clean marine Diesel R&D project for the IMO NOx Tier III Regulations - MITSUBISHI Heavy Industries technical review 2010 47 3
- Kondo Shigeo et al. Effect of Pressure and Oxygen Concentration on Quenching Distances Flammable Gases Nippon Kagaku Kaishi 7 1992 788 792
- Heywood , John E. Internal Combustion Engine Fundamentals l McGraw-Hill Education 1989 930 978-0071004992
- Paolo and Carter Skipton Andy , Bergen Emissions - The way ahead. Tremuli CIMAC Congress 2010 2010 Paper no.:132
- OHNO Hirokazu Development of a Nitrogen-enrichment /Humidification Membrane System For NOx Emission reduction For Marine Diesel Engines 2011 ISME C6-3
- Gamma Technologies A GT-SUITETM Application for Engine Performance, Acoustics, and Control Simulation Gamma Technologies, Inc. GT-POWER USER'S MANUALHalstead 2006
- REACTION DESIGN CHEMKIN: LEADING SOLUTIONS FOR THE RAPID SIMULATION OF COMPLEX CHEMISTRY Reaction Design, Inc. San Diego Manual 2010 2010