Desulphurisation and denitrification of waste gas - using granular carbonaceous adsorbent in two beds moving downwards, with addn. of ammonia before second

摘要

Removal of SOx and NOx from waste gas also contg. O2 and steam is carried out with addn. of NH3 at 110-180 degrees C by passing the gas across a bed of granular carbonaceous adsorbent, opt. contg. catalyst, moving downwards in a reactor. Much (20-80%) of the SOx is adsorbed in a first bed, whilst NOx is reduced catalytically to N2 and more SOx is sepd. in a second bed after dosed addn. of NH3 (0.4-1.5 mole/mole NO). Process is useful for treating furnace waste gas and smoke. It operates at low temp., which favours removal of NOx and minimises amt. of NH3 required.