FIELD: cleaning of flue gases. SUBSTANCE: method involves pre-treatment of carbamide aqueous solution by thermohydrolysis and evaporation and introduction of recovery mixture formed in the process into gases to be cleaned whose temperature is between 700 and 1200 C. Device has lined housing with fuel burners, combustion chamber, and flue, carbamide aqueous solution thermohydrolysis unit that also functions to evaporate this solution, and line for feeding recovery mixture formed in the process to gas flow which has set of injectors. EFFECT: enlarged functional capabilities. 9 cl, 3 dwg, 4 tbl
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