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REACTION OF H2S AND SULFUR WITH LIMESTONE PARTICLES
Citation:
Borgwardt, R. AND N. Roache. REACTION OF H2S AND SULFUR WITH LIMESTONE PARTICLES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-84/300 (NTIS PB85203180), 1984.
Description:
The paper gives results of a study of the direct-displacement reaction of limestone with hydrogen sulfide (H2S) over the temperature range 570-850 C in a differential reactor. It is one of several possible mechanisms of sulfur capture in limestone-injection multistage burners which are being developed to minimize pollution from coal combustion. Measurements with particles ranging in size from 1.6 to 100 micrometers showed that the reaction rate is proportional to the superficial surface area of the limestone. The reaction is inhibited by H2 and CaCl2. Sintering og CaCO3, dissociation of H2S, and product layer diffusion limit the rate of CaS formation at temperatures above 750 C. Limestone also reacts with elemental sulfur, but the rate and activation energy are significantly lower than those of the H2S reaction.