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在一台缸径×行程＝250×250mm的中速柴油机上进行了燃用水－重油乳化燃料的运转试验，以查明发动机性能和减少NOx排放的效果。考虑到目前燃用较少加水率的乳化燃料取得减少约30％NOx排放的技术已经实用化，但进一步增大加水率却受到燃料十六烷值降低、着火性恶化、发动机难以正常运转的限制，为此，作者开发了采用A重油的引导喷射燃烧技术，取得了燃料加水率达150％时仍能正常运转的效果。试验表明，A重油的引导喷射率为7％，燃料加水率为110％时，柴油机约可降低90％的NOx排放量。
A running test of a fuel-water-heavy oil emulsion fuel was carried out on a medium-speed diesel engine with a bore × stroke = 250 × 250 mm to find out the engine performance and the effect of reducing NOx emissions. Considering that at present, technologies to reduce NOx emissions by about 30% with the use of emulsified fuels with lower water rates have been put into practical use, further increases in water rates are limited by a decrease in the cetane number of the fuel, a deterioration in ignitability and an inability of the engine to operate normally To this end, the author developed pilot-injection combustion technology using A heavy oil and achieved the effect that the fuel can still operate normally when the water addition rate reaches 150%. Tests showed that when the pilot injection rate of heavy oil A is 7% and the fuel water addition rate is 110%, the diesel engine can reduce the NOx emission by about 90%.