The objective of the present invention is to remove ash, soot, and the like accumulated by combustion gas flow on the front surface of a waste heat boiler furnace wall which generates hot water or high temperature steam by using waste heat generated after combustion in a waste incinerator A waste heat boiler furnace wall front surface cleaning device.;(3), a solenoid valve (2), and an air pressure regulator (4) installed at the upper end of the compressed air storage tank (1) in constituting the waste heat boiler furnace wall front surface cleaning device of a waste incinerator, The heat sink 6 and the drain plug 7 and the injection nozzle 8 and the cooling air supply pipe 5 constitute a single unit which is operated sequentially and periodically in the same direction as the combustion gas flow.
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