Development of dry flue gas desulfurization process using absorbent made from flyash, lime and gypsum.

概要

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New dry flue gas desulfurization process have been developed. In this new process, flyash is utilized as a raw material of the SO2 absorbent. The reactions of this new absorbent with SO2 are very different from those which occur in the typical lime injection or semi-dry absorption processes. 90% SO2 removal efficiency was attained under the condition of 1.05-1.15 Ca/S molar ratio. The numerical simulations of SO2 removal in a cross current moving bed absorber are presented. The results are compared with those from a demonstration plant having a capacity of 50000 Nm3 of flue gas per hour. The reaction is supposed to proceed as follows: SO2 in the gaseous phase initially reacts on the surface of absorbent, a layer of product CaSO4 being formed. The SO2 absorption rate was determined to be dQ/dt=∅ {K1' (Qs-Q) +K2'Q}, where K1', K2', Qs and 1 are determined absorption curve of absorbent. dQ/dt depends on many factor, such as gas temperature and SO2, NO, O2, CO2 and H2O concentration. The numerical model is based on two equations of absorption rate and a mass balance for cross current moving bed absorber. Computed results agreed well with test data.
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