Experimental Study of a Diesel Engine Using Pretreated Biogas on Dual Fuel Mode at Different Injection Timings

Abstract

Pretreatment improves the quantity of biogas produced. In this investigation, initially biogas was obtained from the co-digestion of cow dung (CD) and yard waste (YW) which were prepared at different proportions (i.e. 25:75, 50:50, 75:25 and 100% CD). The samples of feedstock were kept in different laboratory digestors. Sodium hydroxide (NaOH) at 6% by weight was added to all the samples for pretreatment. The obtained biogas from all the digestors were checked for their yield. The ratio with 75:25 CD and YW was found to be better in both yield and quality. Further, an experimental study was conducted on a single cylinder, four stroke, air cooled, direct injection (DI), diesel engine under dual fuel (diesel + biogas) mode at varying injection timings ranging from 20o to 26o crank angle (CA) before top dead centre (bTDC) in steps of 1.5oCA. The experimental results indicated the performance, emission and combustion analysis of the diesel engine in dual fuel mode.