Experimental Investigation of the Optimum Reaction Temperature of Flue Gas Desulfurization Reaction Involving CaO Particles

The desulfurization reaction of flue gases with CaO is subject to a comprehensive influence of the following factors: flue gas composition, reaction temperature and CaO particle inherent characteristics. Through an experimental study and on the basis of summing up the past experience of predecessors it has been proven that the optimum reaction temperature of CaO particles in the circulating fluidized bed of flue gas desulfurization is 800℃. At this temperature it is possible to basically avoid the competitive reaction of such compounds in flue gases as NO, CO_2, etc with respect to a desulfurization reaction and basically do away with the lowering of desulfurization reaction rate caused by the recrystallization process of CaO crystals. It is also possible to transform the main constituents of the desulfurization reaction products into CaSO_4. The pyrolysis temperature of the latter is relatively high and the stability of the desulfurization products relatively good, thus eliminating the possibility of secondary pollution.