Concept of twining injector system for spark-ignition engine fueled with syngas-biogas-hydrogen operating in solar-biomass hybrid energy system

Abstract

This paper presents the research results on an innovative concept of a twining injector system to supply a flexible syngas-biogas-hydrogen blend for engines working in a hybrid solar-biomass renewable energy system. The effects of nozzle diameter, injection pressure and nozzle location were considered. Simulation results showed that the twining injector system, including 2 injectors with a nozzle diameter of 5 mm located close to the inlet port and 1-bar injection pressure is suitable for Honda GX200 engine fueled with syngas-biogas-hydrogen. At engine speed of 3000 rpm, for syngas-biogas blend, the injection duration of the first injector is reduced from 120 CA to 23 CA while the second injector keeps the injection duration stable at 120 CA to 50% biogas, then reduced to 74 CA for full biogas injection. For syngas-hydrogen blend, the first injector keeps the stable injection duration of 120 CA to 50% hydrogen, then gradually decreases to 44 CA, corresponding to 100% hydrogen; the injection duration of the second injector decreases from 120 CA to 24 CA and then keeps constant until hydrogen content reaches 70%. The injection duration of each injector for syngas-biogas-hydrogen blend is within the limits between the injection duration of the syngas-biogas and that of the syngas-hydrogen blends. The mixture of syngas-biogas-hydrogen blend and air in the combustion chamber created by twining injector system was more homogeneous than that created by traditional port fuel injection system.