Chemical Reactions of Injection Desulfurization

Abstract

Understanding the behavior of sulfur capture reaction in boiler is very important for coal gasification and combustion which used injection desulfurization.
In this review, the knowledges which have been accumulated during the past 30years on sulfur capture reaction and reaction rate are surveyed.
Limestone and Dolomite are the most widely used sorbents as well as in fully or partially calcined conditions, and there are about 15 principal reactions occurring between these sorbents and the gaseous reactants H₂S, COS, SO₂, H₂O and CO₂. The major parameters that influnce tese reactions are sorbent type, particle size, temperature, pressure and gas atmosphere. Closure of pores is found to be a main reason for lowering the reactivity of the sorbent. On the other hand, gas atmosphere has the effect not only on reaction rate but also on the sintering of the solid reactant and product.