Controlling combustion and exhaust emissions in a direct-injection diesel engine dual-fueled with natural gas

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:264525

Daisho, Yasuhiro; Takahashi, Kou; Iwashiro, Yuki; Nakayama, Shigeki; Kihara, Ryoji; Saito, Takeshi ^[1]

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1. Waseda Univ., Tokyo (Japan)

An experimental study was conducted to determine combustion and exhaust emissions characteristics in an automotive direct-injection diesel engine dual-fueled with natural gas with the objective of improving exhaust emissions and thermal efficiency. Dual-fuel operation can yield a high thermal efficiency almost comparable to the diesel operation and very low smoke at higher loads. However, NOx cannot be reduced by dual-fueling. On the other hand, at lower loads, a dual-fueled engine inevitably suffers from lower thermal efficiency and higher unburned fuel. To resolve these problems, the effects of exhaust gas recirculation (EGR) were investigated. The results show that in dual-fuel operation, hot EGR can improve thermal efficiency and reduce unburned fuel emission at lower loads, while cooled EGR can considerably reduce NOx at higher loads. A Pt oxidation catalyst can be used for additional reduction in unburned fuel emitted due to dual-fueling.

• OSTI ID: 264525
• Report Number(s): CONF-9510144--; ISBN 1-56091-699-0
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
33 ADVANCED PROPULSION SYSTEMS
AIR POLLUTION CONTROL
CATALYTIC CONVERTERS
CATALYTIC EFFECTS
COMBUSTION CONTROL
DIESEL FUELS
DUAL-FUEL ENGINES
EXHAUST GASES
EXPERIMENTAL DATA
FUEL INJECTION SYSTEMS
HYDROCARBONS
MEASURING INSTRUMENTS
NATURAL GAS
NITROGEN OXIDES
PLATINUM
RECYCLING
SPECIFICATIONS
THERMAL EFFICIENCY