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Studies on biogas-fuelled compression ignition engine under dual fuel mode

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Abstract

Experimental investigation has been carried out to utilize biogas as an alternative source of energy in compression ignition (CI) engine under dual fuel operational mode. Biogas was inducted into the inlet manifold at different flow rates along with fresh air through inlet manifold and diesel was injected as a pilot fuel to initiate combustion under dual fuel mode. The engine performance and emission characteristics of dual fuel operational mode were analyzed at different biogas flow rates and compared with baseline conventional diesel fuel. Based upon the improved performance and lower emission characteristics under the dual fuel operation, the optimum flow rate of biogas was observed to be 2.2 kg/h. The lower brake thermal efficiency (BTE) and higher brake-specific energy consumption (BSEC) were noticed with biogas-diesel fuel under dual fuel mode when compared with neat diesel operation. Test results showed reduced NO x emissions and smoke opacity level in the exhaust tailpipe emissions. However, higher hydrocarbon (HC) and carbon monoxide (CO) emissions were noticed under dual fuel mode at entire engine loads when compared with baseline fossil petro-diesel. Hence, the use of low-cost gaseous fuel such as biogas would be an economically viable proposition to address the current and future problems of energy scarcity and associated environmental concerns.

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Abbreviations

NO x :

Oxides of nitrogen

PM:

Particulate matter

rpm:

Revolutions per minute

CO2 :

Carbon dioxide

CO:

Carbon monoxide

O2 :

Oxygen

HC:

Hydrocarbon

BTDC:

Before top dead center

CI:

Compression ignition

BTE:

Brake thermal efficiency

BSEC:

Brake-specific energy consumption

HRT:

Hydraulic retention time

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Funding

The research work reported here is the part of DST-SERB sponsored fast track project entitled “Studies on combustion, performance and emission characteristics of diesel engine fuelled with Biodiesel and Biogas” (SB/FTP/ETA-306/2013). The financial support extended in the project is gratefully acknowledged.

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Correspondence to Sunil Kumar Mahla.

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Responsible editor: Santiago V. Luis

Highlights

• Biogas is a potential alternative fuel for CI engine under dual fuel mode (DFM)

• Lower BTE and higher BSEC found with biogas under DFM

• Drastic reduction in NO x -smoke opacity with biogas under DFM

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Mahla, S.K., Singla, V., Sandhu, S.S. et al. Studies on biogas-fuelled compression ignition engine under dual fuel mode. Environ Sci Pollut Res 25, 9722–9729 (2018). https://doi.org/10.1007/s11356-018-1247-4

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  • DOI: https://doi.org/10.1007/s11356-018-1247-4

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