Research on the effect of EGR technology on the performance of biodiesel hybrid engine
In order to alleviate the problem of high NOx emissions caused by diesel mixed with biodiesel,a dual-fuel combustion chamber model was constructed by AVL_FIRE software on the basis of the 4190ZLC marine medium-speed diesel engine bench,and the accuracy of the model was verified.Four sets of variables of biodiesel mixing ratio 0～40％and EGR rate of 0～12.5％were set to analyze diesel engine combustion,performance and emissions.The results show that the mixing of an appropriate amount of biodiesel can reduce the temperature in the diesel engine cylinder and reduce the Soot emission,but at the same time,it will lead to a significant increase in NOx emission.The introduction of EGR enables low-temperature combustion and significantly reduces NOx emissions,but too high an EGR rate increases Soot emissions.The biodiesel blending ratio of B40 and EGR rate was 12.5％,the combined NO emission was reduced by 47.7％compared with the original unit,and the mass fraction of Soot emission was 98.13％lower than that of the original machine.The research results can provide a certain guiding basis for the low-temperature combustion of diesel/biodiesel/EGR in marine diesel engines.
dual fuel engineexhaust gas recirculationdiesel-biodiesel mixed fuellow temperature combustionperformance optimization
万方数据
维普
