Optimisation of coal fineness in pulverised-fuel boilers

The analysis of the impact of the composition of the mineral part of the Polish hard coal to the abrasion of mills was made. Based on the measurements carried out and the actual periods between overhauls of mills, which were determined during the operation, a correlation was found to determine the abrasive wear rate of the elements of ring-ball mills with nominal output of 33 t/h (type MKM 33). Exemplary calculations of optimum value of R0.09 were also performed.