Process optimization of Scleropyrum pentandrum biodiesel production and study the effect of blends on CI engine characteristics for variation of engine parameters

Abstract

Intense and continuous research from past decade efforts on biodiesel yield. Adding to this presently the Indian government has taken measures to introduce the biodiesel blends in transport sector which is attracting more research in biofuel’s field. This research article presents the influence of injection pressure, injection timing and compression ratio for different blend variation on performance, combustion, and emissions characteristics of diesel engine. The biodiesel yielded from Scleropyrum pentandrum seeds is subsequently optimized through response surface methodology (RSM). The optimized parameter levels temperature 65 °C, catalyst amount 1% (w/v oil), reaction time 91 min and methanol to oil ratio 37% (v/v oil) yielded biodiesel of 92.9%. B5(95% diesel + 5% biodiesel), B10(90% diesel + 10% biodiesel), B20(80% diesel + 20% biodiesel) & B30(70% diesel + 30% biodiesel) were four blends opted to study fuel characteristics on CI engine with variation of injection pressure, compression ratio and injection timing. The performance study reported higher brake specific fuel consumption and lower brake thermal efficiency in B5, B10, B20 & B30 blends in comparison to diesel. The carbon monoxide, unburnt hydrocarbons and Smoke emissions were comparatively less and same was true for rise in injection pressure to 220 & 240 bar from 200 bar. The increase of compression ratio to 20:1 and injection timing to 25.5°BTDC facilitated in control of carbon monoxide, unburnt hydrocarbons, and Smoke emissions other than NOx. The B20 blend with injection pressure 220 bar and maintaining the compression ratio and injection timing to standard setting is suggested to be the feasible blend considering the performance and emissions.