FIELD: gas cleaning methods. SUBSTANCE: gaseous waste are delivered for heat exchange with other medium with immovable or circulating accumulating masses consisting partially of catalytic material. Reducing agent is supplied from hot surface of accumulating masses so that it does not come in contact with other heating surfaces and outcoming gases. Reducing agent is fed to certain depth till it reaches catalyzer heating surface without getting on heating surface of heat-exchanger positioned under accumulating masses. For this purpose device is provided with hoods. One of hoods contains tube with at least one branch pipe fitted with nozzle. EFFECT: environment is not contaminated with waste saturated with ammonia. 6 cl, 4 dwg
