Optimisation of coal fineness in pulverised-fuel boilers

A method for choosing the optimum fineness of coal in pulverised-fuel boilers is presented. This method is based on economic criteria and takes into account variations of the power unit load as well as the durability and the output of pulverisers. Calculations are performed for short periods of time (e.g. 1 h), provided that it is possible to change the fineness of the coal by controlling the angle of the classifier guide vanes. Therefore, the...