Influence of Mico Fuels on Engine Performance, Exhaust Emissions, and Performance.

The influence of Micronized Coal-in-Oil MICO fuels on engine performance and exhaust emissions was experimentally studied in a single-cylinder Hatz diesel engine. One of these fuels, which contained 20 wt coal, was also examined for its effects on engine endurance and wear in a four-cylinder Mercedes diesel engine. The performance and emissions tests were conducted at twelve different steady-state conditions covering the operating speed-load range of the engine. In each test, the exhaust emissions including particulates, sulfates, and smoke, crankcase blowby, and temperatures were measured, and brake thermal efficiency and air-fuel ratio was calculated. The results obtained with the single-cylinder engine indicate that the coal in MICO fuel hinders the combustion of the diesel component and decreases the overall brake thermal efficiency of the engine. Although the coal reduces the consumption of diesel fuel component, the total energy consumption is higher.