STACK GAS DESULPHURIZATION PROCESS

PURPOSE:To obtain an adsorbent having high adsorptivity for SO2 and high strength and to perform desulphurization of stack gas with low production cost of the adsorbent and low operation cost by using an adsorbent prepd. by kneading pulverized coal with a binder and water, molding the kneaded product and calcining it at a specified high temp. range in the presence of steam. CONSTITUTION:A part of coal supplied to a boiler 2 is pulverized by a crusher 8; the crushed product is kneaded with a binder and water in a kneader 9 and molded in a molding machine 10 under pressure. The molded coal material is heated in a calcination furnace 11 at 800-1,000 deg.C with combustion waste gas contg. steam. The used adsorbent is sent from the calcination furnace 11 to a regenerator 13. The adsorbent having adsorbed SO2 by contacting with the waste gas in an adsorber 4 is fed to the regenerator 13 where it is regenerated by heating in inert gas atmosphere and regenerated adsorbent is fed back to the adsorber 4 and used circulatorily.