Abstract
Because hydrogen can be produced by renewable electricity and the combustion products from hydrogen mixture don’t include carbon monoxide or dioxide and unburned hydrocarbon components, we applied hydrogen to diesel dual fuel (DDF) engine and validated the method to improve combustion performance. H2 DDF operation could improve CO2, CO, THC and smoke emission that includes carbon without degradation of thermal efficiency, however, NOx emission gets worse than conventional diesel combustion. In addition, the operation was restricted by abnormal combustion occurred under high load and H2 ratio condition. For the reduction of NOx emission, combustion with advanced diesel fuel injection timing and EGR were effective methods. On the other hand, it is supposed that several percent of input energy was lost by unburned hydrogen remaining in the center of cavity and squish area and discharged from H2 DDF engine.
