To carry out a process for regulating individual factors or all factorsinfluencingcombustion on a furnace grate, a radar device (22) is provided primarily. Thisradar device(22) serves to detect the three-dimensional distribution of the fuel mass onat least onepreferred region of the grate. In addition, an infrared camera (23) isprovided for supplyinginformation on the burn-up behavior of the fuel located on the grate. By usingthe measuredquantities obtained from these two devices, control variables may be derivedwithin aregulating unit for influencing the grate speed, the charging device, theamount andcomposition of supplied primary air, the amount and composition of suppliedsecondary air,the speed of the ash roller and the temperature of the air preheating deviceso that the furnaceperformance can be adapted to the steam output requirement. In addition toimproving thefuel burn-up on the grate, it is also possible to influence the exhaust gas inan advantageousmanner, for instance, with respect to the formation of unburned gas componentsand nitrogenoxides.
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