FIELD: process engineering.
SUBSTANCE: invention is intended for cleaning flue gases of harmful admixtures. Proposed method comprises mixing flue gases with ozone-air mix and oxidising nitrogen oxide (NO) to nitrogen dioxide (NO2) in pre-oxidising chamber, feeding acid condensate for cleaning of acid components into heat recovery unit first chamber operated in cold conditions, separating solution of hydrogen nitrate solution (HNO3·3H2O) and forcing it in hydrogen nitrate storage tank. It comprises also adding hot air flow to blow air prior to feeding it into processing zone for cooling flue gases, parallel feed of purified flue gases into heat recovery unit second chamber wherein stepwise ice defrosting occurs during regeneration by purified flue gases that are forced from heat recovery unit into atmosphere. Finally, cold air is directed into second chamber, while purified flue gases are directed in first chamber to repeat abode described cycle. Proposed device comprises processing zone including the chamber of pre-oxidising with distributor of ozone-air mix, heat exchange-condensation and absorption-condensation sections with separate trays, pump, heat recovery unit consisting of two identical chambers with trays wherein inclined slot-like shelves are staggered.
EFFECT: higher efficiency of flue gas cleaning of nitrogen oxides.
2 dwg
