Abstract
In previous study, the cellulosic liquefaction fuel (CLF) was made from woods by the direct liquefaction process and the wood tar was used as a solvent, however CLF was not ignited by the compression ignition and was not mixed with diesel fuel. In practical use of CLF, fatty acid methyl ester was used to mix with diesel fuel stably and completely. Therefore, the solubility of CLF with diesel fuel should be improved. In this study, CLF was liquefied by using the mineral oil as a solvent and polypropylene was mixed with wood in order to improve the solubility to the diesel fuel. In experiments, the weight mixing ratio of CLF to diesel fuel was varied until 20 wt.% by every 5 wt.%. In ordinary engine performance test, the compression ignition and combustion characteristics were almost similar to those of diesel fuel and the engine performances were not influenced by mixing ratio of CLF. THC was decreased as the weight mixing ratio of CLF increased, because CLF included oxygen atoms in its molecule. In high load condition, CO and smoke concentrations were also decreased, however S0_2 concentration increased. When 5 wt.% of CLF was mixed to diesel fuel, the diesel engine could be continuously and stably operating for 3 hours without any bad influence on ignition characteristics and engine performance. Therefore, CLF can be practically used as alternative fuel for diesel engines.
