In this study, diesel-water emulsion fuels were generated using emulsifiers with modified HLB values. Next, diesel-ammonia aqueous emulsion fuels were generated using diesel and ammonia aqueous. An ultrasonic homogenizer was used for the generation. Next, combustion experiments were conducted using the generated fuel. A single cylinder diesel engine was used in the experiments. The engine speed was set at 2400 rpm and the engine load varied from 30, 50, and 70% based on 12.8 Nm. The cylinder pressure also increased when ammonia aqueous was used. It was confirmed that ammonia affects combustion characteristics. Diesel-water emulsion fuels and diesel-ammonia aqueous emulsion fuels reduced NO emissions compared to diesel. However, diesel-ammonia aqueous emulsion fuels sometimes increased NO emissions compared to diesel-water emulsion fuels. In addition, diesel-ammonia aqueous emulsion fuels decreased CO emissions compared to diesel-water emulsion fuels. The results showed that the combustion performance was improved by setting the HLB value to 12. In addition, combustion of ammonia occurred, suggesting that combustion was improved.
Tanaka et al. (Wed,) studied this question.