Abstract
With the development of the second generation pressurized fluidized-bed combustion combined cycle (PFBC-CC), integrated gasification combined cycle (IGCC) and the technology of staged combustion for lower emission of NOx, limestone desulphurization under a reducing atmosphere is gradually becoming a very important problem. This paper presents static tests of limestone desulphurization reaction under a reducing atmosphere. The experiment was done by an atmospheric thermogravimetric analyzer (TG-DTG8110, made in Japan). The sorbent is limestone from Nanjing, China. Its CaCO3 percentage is 93·75% and particle mean diameter is 0·63mm. Mixed gas concentrations are as follows. (N2+H2S) mixed gas: [H2S] is 1·366E4, 2·277E4 and 2·73E4mg(Nm3)−1; (O2+N2) mixed gas: [O2] is 3, 5, 7 and 100%. Test temperatures are 920–930°C and 835–845°C. The optimal reaction conditions were obtained from the experiment. Sulphidation reaction at about 925°C and oxidation reaction at about 848°C are carried out easily. Through numerical handling, the dynamic equations of sulphidation and oxidation reactions are also obtained. Copyright © 1999 John Wiley & Sons, Ltd.
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