METHOD AND APPARATUS FOR IGNITION AND SUSTAINING COMBUSTION OF PULVERIZED COAL

摘要

A method and an apparatus for the ignition of pulverized coal to furnish energy for warming-up or low load operation of a coal burning furnace, the method comprising forming a fuel stream consisting of a mixture of pulverized coal and air, in a pipe (16), the fuel stream having an air-to-coal ratio and/or a flow velocity which fluctuates. The fluctuating fuel stream is introduced into a combustion area where the coal is ignited by an energy source (23). The fluctuation of the air-to-coal ratio and/or the fluctuation of the flow speed provide for the air-to-coal ratio and or the flow speed to be swept through a range of values which include the optimum conditions for ignition.