이중분사기가 장착된 디젤 엔진에서 목질계 열분해유의 적용 가능성에 관한 연구

Abstract

The vast stores of biomass available in the worldwide have the potential to displace significant amounts ofpetroleum fuels. Fast pyrolysis of biomass is one of several paths by which we can convert biomass to higher valueproducts. The wood pyrolysis oil (WPO) has been regarded as an alternative fuel for petroleum fuels to be used in dieselengine. However, the use of WPO in a diesel engine requires modifications due to low energy density, high watercontents, high acidity, high viscosity, and low cetane number of the WPO. One possible method by which theshortcomings may be circumvented is to co-fire WPO with other petroleum fuels. WPO has poor miscibility with lightpetroleum fuel oils; the most suitable candidates fuels for direct fuel mixing are methanol or ethanol. Early mixing withmethanol or ethanol has the added benefit of significantly improving the storage and handling properties of the WPO. For separate injection co-firing, a WPO-ethanol blended fuel can be fired through diesel pilot injection in adual-injection dieel engine. In this study, the performance and emission characteristics of a dual-injection diesel enginefuelled with diesel (pilot injection) and WPO-ethanol blend (main injection) were experimentally investigated. Resultsshowed that although stable engine operation was possible with separate injection co-firing, the fuel conversionefficiency was slightly decreased due to high water contents of WPO compare to diesel combustion.