Coal-fueled diesel engines: Analytical evaluations of ignition options
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An engine cycle simulation was developed to investigate the ignition and combustion characteristics of coal-water slurry fuels in a reciprocating, internal combustion engine. The simulation includes models for fuel and air mixing, wall heat transfer, solid coal particle combustion, coal devolatilization, and liquid evaporation and combustion. These models together with a thermodynamic analysis of the cylinder gas yield instantaneous cylinder conditions and overall indicated engine performance. The engine parameters and operating conditions were selected to be representative of a locomotive engine operating at 1000 RPM. Engine and fuel parameters investigated include engine inlet conditions (temperature and pressure), coal particle sizes and size distributions, fuel additives, and coal properties. Increases in the initial (at BDC) gas temperature or pressure, or the addition of small amounts of diesel oil improved the ignition characteristics. Slurries with smaller particle sizes exhibited better ignition qualities and resulted in higher peak indicated thermal efficiencies than slurries with larger particle sizes. Results obtained using monosize sauter mean diameter particles agreed well with results obtained for the corresponding distribution. Finally, ignition was achieved at lower initial gas temperatures for higher reactivity coals. 1988 Combustion Institute.
