各種石灰石粒子から熱分解生成されたCaO粒子のSO2に対する反応性の比較

概要

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For the suitable selection of calcium-based sorbents of SO2 in FBC of coal, reactivities of CaO pellets prepared by calcination of various kinds of limestones were compared on the basis of the results from a TGA study within the range of reaction conditions : temperature, 700-1100°C and pellet diameter, 5-1000 μm. For ultra-fine pellets (5 μm), the chemical reaction rate controls the overall rate and there is hardly any variation in SO2 reactivity among the CaO pellets employed. For CaO pellets larger than 300 μm, the intrapellet pore volume decreases as the calcination temperature rises. Pellets prepared from Coral Reef Rock (CRR) have the largest value of pore volume among the CaO pellets employed. With increase in pellet diameter, the effect of intrapellet diffusion rate of SO2 on the overall rate becomes increasingly significant but depends largely upon the initial pore volume of the CaO pellet, i.e. calcination temperature and original limestone. As a result, the CaO pellets prepared from CRR have the largest value of SO2-saturation capacity.
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