Abstract
In this paper the emission characteristics and performance of various bio diesel fuels (Tyre pyrolysis oil (TPO), Micro algae oil and Pig animal fat oil) were experimented. A single cylinder, water cooled diesel engine was modified in to homogeneous charge compression ignition engine (HCCI) with adopted port fuel injection (PFI) technique. The effects of air fuel ratio, intake temperature, injection pressure and EGR rate exhaust emissions were explained in a broad manner. The analysis of the exhaust emissions are integrated to oxides of Nitrogen (NOx), Carbon Monoxide (CO), unburned hydro carbons (UHC), smoke and soot. The performance analysis was also included on specific fuel consumption and break thermal efficiency. The basic requirements for HCCI engine is the homogeneous mixture preparation of air and fuel. This mixture formation was done by adopting port fuel injection technique and external devices were also used for bio diesel vaporization and mixture preparation. The combustion processes were measured with different EGR system. The experimental results of different bio diesel fuels with HCCI engine mode were recorded and evaluated. A small increase in CO and HC emissions were observed with increasing bio diesel content due to slow evaporation rate of bio diesel. A significant reduction in NOx emission was also observed with respect to difference in bio diesel blends. Micro algae oil was found more stable compared with other bio diesel fuels due to the property of fuel vaporization and low heat releasing.
Highlights
CAI combustion and analysed the Performance and analysis[3]
In 2008, Himabindu et al has performed on the homogeneous charge compression ignition engine (HCCI) combustion of diesel fuel with external mixture formation technique revealed that NOx emissions reduced by 45-95% with 0-30% EGR at 75% load compared to conventional diesel combustion
Major problems in homogeneous mixture preparation: it required high intake temperature of air for external mixture preparation, this paper proposed preparation of the homogeneous mixture with the external mixture formation to control the combustion and ignition by using the ECU
Summary
CAI combustion and analysed the Performance and analysis[3]. In 2003, Tsolakis et al, to performed on The HCCI engine has at a day’s many automobile industries are looking for alternative technology in Internal Combustion (IC) Engine. In an IC engine, HCCI combustion can be achieved by premixing the air-fuel mixture and compressing it until the temperature is high enough for auto ignition (just like in the CI engine). The major problem of modifying conventional diesel engine to HCCI mode engine is the controlling of the combustion and possible high emission of CO and HC [5]. In 2008, Himabindu et al has performed on the HCCI combustion of diesel fuel with external mixture formation technique revealed that NOx emissions reduced by 45-95% with 0-30% EGR at 75% load compared to conventional diesel combustion. In 2015 A.Avinash, et al, conducted experiment on Lean homogeneous combustion using external mixture formation technique used as an E-diesel fuel and performed emission analysis [15]. Exhaust gas recirculation was used up to 30 % to reduce the HC and CO of HCCI mode engine
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