Predicting the Performance and Emissions Characteristics of a Medium Duty Engine Retrofitted with Compressed Natural Gas System Using 1-Dimensional Software

Ahmad Jais Alimin; Muhammad Yusri Ismail; Shahrul Azmir Osman

doi:10.4028/www.scientific.net/AMM.660.468

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 660Predicting the Performance and Emissions...

Predicting the Performance and Emissions Characteristics of a Medium Duty Engine Retrofitted with Compressed Natural Gas System Using 1-Dimensional Software

Abstract:

The rise of crude oil price and the implications of exhaust emissions to the environment from combustion application call for a new reliable alternative fuel. A potential alternative fuel for compression ignition (C.I.) engine is the compressed natural gas (CNG). For C.I. engines to operate using CNG, or to be converted as a retrofitted CNG engine, further modifications are required. Previous works reported loss in brake power (BP) and increase in hydrocarbon (HC) emission for C.I. engine retrofitted with CNG fuelling. Verification of performance characteristics for CNG retrofitted engine through experimental analysis requires high cost and is very time consuming. Thus, a 1-Dimensional simulation software, GT-Power, was introduced in this study to reduce the experimental process and setup. A 4-cylinder medium duty C.I. engine (DE) and CNG retrofitted engine (RE) GT-Power models were used in this simulation work over various operational conditions: low, medium and high load conditions. As compared with DE model, results from RE model showed that RE model achieved an average 4.9% improvement for brake specific fuel consumption (BSFC) and loss in BP by 37.3%. For nitrogen oxides (NO_X) and carbon dioxides (CO₂) RE model predicted reduction of 48.1% (engine mode 1-9) and 33.4% (all engine modes), respectively. Moreover, RE produced 72.4% more carbon monoxide (CO) and 90.3% more HC emission.

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Periodical:

Applied Mechanics and Materials (Volume 660)

Pages:

468-473

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.660.468

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Online since:

October 2014

Authors:

Ahmad Jais Alimin*, Muhammad Yusri Ismail, Shahrul Azmir Osman

Keywords:

Compress Natural Gas, Diesel Engine, GT-Power, Retrofit Engine

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