Experimental Investigation of Applying Raw Fuel Injection Technique for Reducing Methane in Aftertreatment of Diesel Dual Fuel Engines Operating under Medium Load Conditions Kasetsart Univ

Format:

Conference/Event

Author/Creator:

Noipheng, Noipheng, author.

Contributor:

Aroonsrisopon, Tanet

Thummadetsak, Thummarat

Waitayapat, Napumee

Wannatong, Krisada

Wirojsakunchai, Ekathai

Conference Name:

SAE International Powertrains, Fuels and Lubricants Meeting (2011-08-30 : Kyoto, Japan)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2011

Summary:

Towards the effort of using natural gas as an alternative fuelfor a diesel engine, the concept of Diesel Dual Fuel (DDF) enginehas been shown as a strong candidate. Typically, DDF'sengine-out emission species such as soot and nitrogen oxides aredecreased while carbon monoxide and hydrocarbons are increased. Theaftertreatment system is required in order to reduce thesepollutant emissions from DDF engines. Additionally, DDF engineexhaust has a wide temperature span and is rich in oxygen, whichmakes HC emissions, especially methane (CH₄), difficult to treat.Until now, it is widely accepted that the key parameter influencingmethane oxidation in a catalytic converter is high exhausttemperature. However, a comprehensive understanding of whatvariables in real DDF engine exhausts most influencing a catalyticconverter performance are yet to be explored.In the current study, a technique, called raw fuel injection, isselected for heating up exhaust temperature via Diesel OxidationCatalyst (DOC) sufficient to treat methane. The benefits of usingthis technique can be seen in the lower power consumption withminimal complexity and costs in many diesel aftertreatmentoperations. The system is installed into the tailpipe of afour-cylinder turbocharged diesel engine which is converted into aDDF engine operating under premixed natural gas and direct dieselinjections. The injector introduces vaporized diesel fuel into theexhaust system in front of the first DOC. The second DOC isinstalled downstream of the first DOC in order to treat methane.Engine speed, lambda, engine-out exhaust temperature, and raw fuelinjection amounts are varied to investigate influences of raw fuelinjection characteristics on reducing methane.Results showed that the exhaust temperature of 230°C wassufficiently high for oxidizing diesel fuel in DOC. Once thiscondition was met, the key important parameter on reducing methaneis not only fuel injection amount (resulting in exhaust temperaturevariations), but also engine-out's lambda (oxygen concentrationin the exhaust) and exhaust species compositions. Fuel injectionamounts could be optimized with engine-out's exhausttemperature and CH₄ conversion efficiency. The modified exhaustcharacteristics via raw fuel injection demonstrated improvements inreducing methane emissions from DDF engines

Notes:

Vendor supplied data

Publisher Number:

2011-01-2093

Access Restriction:

Restricted for use by site license