Abstract
The present experimental study aims to examine the combustion and emission characteristics of a single cylinder four stroke direct injection diesel engine operated in dual fuel mode using dairy scum oil methyl ester (DiSOME) and its blend (B20)—producer gas combination with and without addition of hydrogen. DiSOME/B20-producer gas combination without hydrogen addition exhibited inferior performance with increased hydrocarbon and carbon monoxide emissions owing to poor physic-chemical properties of both biodiesel and inducted low calorific value gas (producer gas) compared to the same fuel combination with hydrogen. Producer gas was inducted along with air, and hydrogen was allowed to mix with air-producer gas combination in the intake manifold. Experimental investigations were conducted at all load conditions and at constant flow rate of hydrogen (8 lpm). It was noticed that that B20-hydrogen enriched producer gas combination with optimum parameters resulted in amplified thermal efficiency with reduced emission levels compared to the operation with B20/DiSOME-producer gas combination. However, investigation showed that diesel-producer gas combination with hydrogen addition provided amplified brake thermal efficiency by 3.8%, 16.4% and 13.2% compared to the diesel/DiSOME/B20—producer gas combinations, respectively, at 80% load. Hydrogen addition provided enhanced cylinder pressure and heat release rate with reduced emission levels except nitric oxide emissions. It can be concluded that the deprived combustion associated with DiSOME/B20-producer gas combination can be improved with hydrogen addition. The combination of DiSOME-producer gas operation with hydrogen addition is uniqueness of this present work.
Highlights
Diesel engines are more accepted for power generation applications due to its greater thermal efficiency with reduced HC and CO emissions caused by the greater compression ratio, lower fuel consumption and lower pumping losses
The outcome for the dairy scum oil methyl ester (DiSOME)-producer gas derived from biodiesel treated biomass, with and without hydrogen addition was distinguished and compared to the base line diesel based dual fuel operation and the same was demonstrated in the successive paragraphs
Utilization of dairy scum, vegetable oil and municipal solid waste (MSW) derived fuels (DiSOME/B20-producer gas combination) in a diesel engine operating on dual fuel mode with and without hydrogen has been investigated
Summary
Diesel engines are more accepted for power generation applications due to its greater thermal efficiency with reduced HC and CO emissions caused by the greater compression ratio, lower fuel consumption and lower pumping losses. Diesel engines can operate on wide variety of fuels. In order to comprehensively utilize renewable fuels such as gaseous fuels in diesel engines, a dual fuel concept was developed. Combustion of conventional fuels in internal combustion (IC) engines have brought decreased fossil fuel reserve in the earth crust and increased green house gas (GHG), this in turn contribute to global warming. Use of renewable fuels for internal combustion engine (IC) applications provide several solutions for the issues such as energy crises, depleting reserves and environmental
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