Particle size is a crucial property of fuels which effects combustion efficiency, combustion stability and pollutant formation of conventional energy generation systems. Present study investigates the relationship between fuel particle diameter and the main working parameters of a power plant boiler. The boiler of 600MW power plant was investigated through a numerical simulation with real dimensions and real working conditions. Also, Rosin-Rammler method was utilized for the distribution of fuel droplet diameter. Results show that by increasing droplet mean diameter, the maximum temperature of the boiler decreased, maximum temperature peak approached rear wall and combustion efficiency of the boiler decreased too. From environmental point of view, increase of droplet mean diameter resulted in decrease of NOx, soot and other pollutants but in order to maintain power plant working parameters like main steam temperature, fuel consumption must be increased that makes more pollutants.

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