Effects of pilot diesel jet and fuel compositions on performance and emissions of dual fuel engine fueled with hydrogen enriched biogas
Abstract
In combustion of dual fuel engines fueled with biogas-hydrogen, NOx formation occurs mainly in the reaction area of gas mixture, soot formation is in diffusion combustion regions of diesel jet and CO formation is in combustion products with a high fuel concentration region. Hydrogen addition to biogas improves Wi, reduces CO emission, slightly affects soot concentration but leads to an increase in NOx concentration in exhaust gas. The influence tendency of CH4 in biogas on Wi and pollutant emissions is similar to that of hydrogen but with a different amplitude related to the difference in combustion speed. The increase in amount of diesel injection slightly affects Wi, but significantly affects CO and soot emissions. With a given operating condition and equivalence ratio, the spark ignition mode is more beneficial than the dual fuel ignition mode both in terms of performance and pollutant emission control.
Moraref