Effects of Steam on Simultaneous Calcination and Sulfation of Limestone under O2/CO2 Conditions

doi:10.3969/j.issn.1000-7229.2016.01.015

Abstract

Abstract:

To further discuss the effect of steam on the sulfation characteristics under oxygen-enriched atmosphere, this paper implements the simultaneous calcination and sulfation experiment for limestone in oxygen-enriched combustion with using isothermal thermogravimetric experiment device, and studies the influences of steam concentration, temperature, particle size and limestone type on the simultaneous calcination/sulfation characteristics of limestone. The calcination rate is increased by the presence of H₂O, which results in a shorter time needed for the complete decomposing of limestone. There is an obvious promotion by H₂O in the diffusion controlled stage；however the influence is hardly detected in the dynamic controlled stage. The influence of steam is highlighted with the increase of temperature (within experimental range) under oxygen-enriched atmosphere, and the finally calcium conversion rate increases with the temperature increasing. The effect of particle size is significant, and the ultimate calcium conversion rate increases significantly with the decrease of limestone particle size. The influences of steam on the simultaneous calcination/sulfation characteristics of different types of limestone are basically the same.

Key words: O₂/CO₂ atmosphere, limestone, calcination/sulfation, steam

CLC Number:

TM 621.2

GUO Taicheng, DENG Fei, ZOU Chan, WANG Chunbo. Effects of Steam on Simultaneous Calcination and Sulfation of Limestone under O₂/CO₂ Conditions[J]. Electric Power Construction, 2016, 37(1): 97-102.

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Effects of Steam on Simultaneous Calcination and Sulfation of Limestone under O₂/CO₂ Conditions

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