Experimental Study on Removal of Nitrogen Oxides in Process of Recovering Krypton-85 from Spent Nuclear Fuel
The existence of nitrogen oxides in the dissolved exhaust gas of spent fuel will seriously affect the recovery of krypton-85,which needs to be removed to meet the recovery requirements.In addition,NOx emissions can have a significant impact on human health and the environment.In this study,NOx were removed by ammonia selective catalytic reduction method.The effects of reaction temperature,NOx concentration and space velocity on NOx removal rate were studied,and the accelerated aging test of catalyst was car-ried out.The results showed that the effect of reaction temperature and NOx concentration on NOx removal rate was not significant,while the effect of airspeed on NOx removal was significant.Using ammonia selective catalytic reduction method,when the reaction temperature was 350℃,the air speed was 2 000 h-1 and 10,000-40,000 ppm inlet Nox concentration,Nox removal rate was greater than 99%.The concentration of Nox can be reduced to 22 ppm,and the product was mainly nitrogen,without additional waste,which is very prom-ising in Kr-85 recovery process.
krypton-85nitrogen oxideselective catalytic reduction of ammonia
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