A sugar processing plant requires 150,000 kg/h of steam at 200 bars and 240C superheat from water entering the economizer at 60C below saturation and leaves at 10C below saturation. Air is fed at a rate of 1.5105 kg/h to be preheated from 25 to 250C. There is no steam reheat cycle available. The coal used has ultimate analysis of a bituminous coal: Moisture - 2.7, Carbon - 73.6, Hydrogen - 4.6, Sulphur-2.5, Nitrogen - 1.3, Ash - 8.4 and