Removing acidic gases from combustion gases - comprises feeding gases through vortex reactor contg. dispersed ground chalk, passing hot gases through heat exchanger and electrostatic particle separator

摘要

Removal of acidic gases (esp. SO2 and SO3) from combustion gases comprises feeding the gases through a vortex reactor (3) in which finely ground chalk (mean particle size 0.2 mm) is dispersed, at 800-900 deg.C. The hot gases are passed through heat exchangers and then an electrostatic particle separator (2) and the solids are pptd. according to size. Particles of dia. up to 0.005-0.010 mm are washed out with water sprays, coarser particles (contg. CaO) are recycled, and a mixt. of CaSO3 and CaSO4 is recovered. USE - The process avoids atmospheric pollution with acidic gases