Abstract
In order to additionally supply LNG to a heavy-duty commercial diesel engine, a dual fuel system was installed; engine power and exhaust gas emissions while operating in the ‘ND-13 mode’, in accordance with the notice from the Ministry of Environment, were investigated. The feasibility of retrofitting the dual fuel system and plans based on mixture rate, power, and emission reduction to enable commercialization were evaluated. The engine power and torque values were within ±5% of the values for the existing engine; these were within the legal modification range. In case of exhaust gas emissions, the decrease in CO 2 emission due to the increase in load was apparent; it was reduced by 15.3%. NO X emission decreased by 58%; this could be attributed to the decrease in combustion temperature owing to water injection. THC and CO increased significantly, possibly due to the reduced combustibility of natural gas owing to bulk quenching, water injection, and the absence of catalysts. Additional research focused on modification of mapping values and installation of oxidation catalysts to improve the combustion performance of the system, is warranted.
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