Utilization of Poor Biogas as Fuel for Hybrid
Biogas-Diesel Dual Fuel Stationary Engine
Bui Van Ga*‡, Nguyen Viet Hai*, Bui Thi Minh Tu**, Bui Van Hung*
* Department of Transport Mechanical Engineering, University of Science and Technology-The University of Danang
** Department of Electronic and Telecommunication, University of Science and Technology-The University of Danang
‡Corresponding Author: Bui Van Ga, 41 Le Duan Street, Danang, Vietnam, Tel. +84 913 402 278
Email: buivanga@dongcobiogas.com
Abstract: An experimental investigation was conducted to examine the effect of combustion of biogas on the performance of hybrid biogas-diesel dual fuel engine converted from a diesel engine. Effects of biogas composition, equivalence ratio, engine speed and pilot injection on engine performance were taken into consideration. The tests were carried out on the AVL engine test bed with APA204 dynamometer. The results show that peak of cylinder pressure and indicated engine cycle work decrease as decreasing CH4 concentration in biogas or/and as increasing engine speed. To ensure the original rated output power as the hybrid biogas-diesel dual fuel engine fueled with diesel alone, pilot injection must increase up to 30% of rated injection as the engine fueled with raw biogas containing 60% CH4.With rich biogas, diesel injection is needed only for ignition purpose, about 10% of rated injection. As the dual fuel engine fueled with biogas containing 70% CH4, maximum output power is higher than diesel rated output power but lower than diesel maximum brake power. With biogas containing 80% CH4, maximum output power of dual engine is close to diesel maximum brake power. Indicated efficiency of the engine decreases as increasing engine speed. Indicated engine cycle work of hybrid biogas-diesel dual fuel engine fueled with biogas containing from 60% to 80% CH4 reaches its maximum value at equivalence ratio in range from 1.10 to 1.02. In case of shortfall of biogas supply, the engine can be switched automatically to diesel operation. The new concept of hybrid biogas-diesel dual fuel engine fueled with poor biogas is very useful in rural area. It can operate and save fossil fuel at any biogas supply conditions.
Keywords:energy; renewable energy; green energy; energy saving
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