Calcium sulfide oxidation method

Abstract

CaS oxidation has CaS particles oxidized into CaSO,completely as far as to the interior of the particle. The interior of an oxidation apparatus,is partially partitioned by a partition,to thereby form a first fluidized bed,on the inner side, a second fluidized bed,on the outer side and a space portion,thereabove. A heat exchanger,having a baffle plate is disposed on the inner side of the partition,and an in-bed heat exchanger,is disposed on the outer side of same. A desulfurizing product-containing fine powder,and coarse powder,and a mixture gas,of nitrogen, oxygen and steam are supplied into the second fluidized bed,. Also, coal,and coal char,are supplied into the first fluidized bed,from below. Of the particles,oxidized in the second fluidized bed,and supplied into the first fluidized bed,from below with the flow of a mixture gas,, the fine powder entrains into the space portion,as entrained particles,and a major part thereof falls down into the second fluidized bed,as particles,. The completely oxidized particles are discharged as discharged ash,and entrained ash