Abstract
For decades, four-stroke compression ignition engines prove to be indispensable in major sectors of transport, agriculture, etc., and it will be very difficult to completely replace these heavy-duty workhorses in upcoming days. However, the present situation of four-stroke compression ignition engines is miserable and the future of these engines highly relies on meeting the emission norms that are being imposed every year. In this regard, renewable liquid fuels are capable of solving the problem of energy supply in a decentralized fashion and these fuels can simultaneously help in achieving environmental sustainability. In order to find a feasible solution to these issues, an endeavor has been made in this work to investigate the engine performance, emission, noise and vibration characteristics of Compression Ignition (CI) engine fuelled with biogas as a secondary fuel and diesel as primary fuel. In this work, the secondary and primary fuels are used to power the kirloskar single cylinder four stroke naturally aspirated water cooled diesel engine. The secondary fuel (biogas) at various quantities was mixed with air and fed into the intake manifold of the engine. Also, the supply of biogas to the engine is precisely controlled by electronic flow control valve. The different flow rates of the biogas are allowed to flow inside the engine with the air intake ratio of 0.075gm/s,0.1gm/s,0.125gm/s,0.15gm/s and the analysis is done on each ratio. From the experimental results it was noted that at 0.125 gm/s, biogas operation significantly reduces noise and vibration. Overall, from the experimental results it is concluded that the usage of biogas in dual fuel mode produces comparable engine performance and reduces noise and vibrations.
Highlights
In recent days, the depletion of accessible fossil fuel reserves and automotive emissions form the basis for investigation using alternative fuels
In this work an endeavor has been made to compare the performance, emission, noise and vibration characteristics of Compression Ignition (CI) engine when operated with neat diesel and biogas-diesel dual fuel
The variation of brake thermal efficiency (%) with load (%) for diesel and biogas-diesel dual fuel is shown in figure 2
Summary
The depletion of accessible fossil fuel reserves and automotive emissions form the basis for investigation using alternative fuels. The current energy situation throughout the world clearly indicates that renewable energy sources are eco-friendly and more feasible than non-renewable energy sources. In this regard, an importance is given worldwide to investigate the viability of renewable energy sources such as solar energy, wind energy, hydro energy and biogas [1]. The generation of biogas concept of anaerobic digestion is called as biological gasification [4]. It is a naturally occurring, microbial process that converts organic matter to methane and carbon dioxide. Due to the presence of oxygen, calorific value of biogas becomes low [4]
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