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Technical Brief

Experimental study of operation stability of an SI engine fueled with coal bed gas

[+] Author and Article Information
Lei CHEN

Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System, Shenyang Aerospace University, Shenyang 110136School of Energy and Power Engineering, Dalian University of Technology, Dalian 116023
cl_officer1981@hotmail.com

Peng SONG

School of Energy and Power Engineering, Dalian University of Technology, Dalian 116023College of Mechanical and Electronic Engineering, Dalian Nationalities University, Dalian 116600
20143625@qq.com

Wuqiang LONG

School of Energy and Power Engineering, Dalian University of Technology, Dalian 116023
longwq@dlut.edu.cn

Liyan FENG

School of Energy and Power Engineering, Dalian University of Technology, Dalian 116023
fengli@dlut.edu.cn

Jing ZHANG

Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System, Shenyang Aerospace University, Shenyang 110136
37843399@qq.com

Yang WANG

School of Energy and Power Engineering, Dalian University of Technology, Dalian 116023
1243069411@qq.com

1Corresponding author.

ASME doi:10.1115/1.4035427 History: Received May 06, 2016; Revised August 26, 2016

Abstract

Experimental research has been performed on a single cylinder naturally aspirated spark ignition engine that was modified to operate with coal-bed gas fuel to investigate methods of improving the stability of operation and lean burn limit. Various fuel compositions, with methane concentrations from 30% to 100% and CO2 volumetric fractions from 0 to 0.7, were employed to simulate coal-bed methane. Hydrogen was then used to improve the operational stability and lean burn limit. The results show that a stable operating range of the engine was obtained with most of the fuel compositions. In addition to operating beyond the lean burn limit, unstable operation with COVIMEP>10% only occurred at the lean burn limit with a CO2 volumetric fraction of 0.7 at each equivalence ratio. The lean burn limit was significantly reduced from the equivalence ratio of 0.6 to 0.4 by adding hydrogen. Stable operation with COVIMEP<5% at an equivalence ratio of 0.4 was also obtained with some high hydrogen concentration conditions. Hydrogen addition induced the reduction of both CO and THC emissions at all the tested equivalence ratios, especially with equivalence ratios of 0.4 and 0.6. However, a high CO2 volumetric fraction will lead to unstable operation, which worsens CO and THC emissions. Hydrogen addition improves the operation stability and enlarges the lean burn limit of coal-bed gas engines, and this addition could have a significant practical impact on the improvement and application of coal-bed gas engine technology.

Copyright (c) 2016 by ASME
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