O2/CO2气氛下水蒸气对石灰石同时煅烧/硫化的影响

为进一步探讨富氧气氛下水分对硫化特性的影响，利用等温热重实验装置，进行了富氧燃烧石灰石同时煅烧/硫化实验，研究了水蒸气浓度、温度、石灰石粒径以及种类等对石灰石同时煅烧/硫化特性的影响。水蒸气提高了石灰石煅烧速率，石灰石完全分解时间缩短；在硫化反应动力学控制阶段水蒸气的影响不明显，而到扩散控制阶段促进作用变得显著。富氧气氛下水蒸气的影响随温度（实验范围）升高而突出，温度越高最终的钙转化率越高。粒径效应显著，随石灰石粒径的减小最终钙转化率明显提高。水蒸气对不同种类石灰石的同时煅烧/硫化特性影响趋势基本一致。

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

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.