化工学报2017，Vol.68Issue(12)：4615-4624,10.DOI:10.11949/j.issn.0438-1157.20170627
流化床锅炉内石灰石同时煅烧/硫化反应中煅烧动力学特性
Limestone calcination kinetics in simultaneous calcination and sulfation under CFB conditions
摘要
Abstract
The interaction of limestone calcination and sulfation in simultaneous calcination/sulfation under circulating fluidized bed furnace conditions was studied by constant-temperature thermogravimetric setup. The sulfation reaction took place simultaneously with calcination and CaSO4 was formed in the particles when SO2 was present. Compared to pure calcination condition, the mass loss rate of limestone calcined in the presence of SO2 was lower but the final mass was higher. Limestone calcination was slowed down by SO2 presence and the calcination rate decreased with increase of SO2 concentration within the range of 0—0.3％. A probable mechanism was proposed that CaSO4 formation by SO2 sulfation with CaO of limestone particles upon calcination may fill or plug pores in CaO layer, impede CO2 transfer, and hinder calcination reaction. The mechanism of SO2 inhibition on limestone calcination was supported by product pore structure analysis and calculation that some pores were plugged and effective CO2 diffusion coefficient in pores was reduced. However, the calcination rate of limestone was increased with particle size decreased from 0.4—0.45 mm to 0.2—0.25 mm, no matter whether there was SO2 or not. Temperature also largely affected calcination, SO2 impeding effect was less pronounced at 880℃ than at 850℃, which was probably due to reduced pore plug of CaSO4 at 880℃.关键词
煅烧/硫化/石灰石/反应动力学/循环流化床/扩散Key words
calcination/sulfation/limestone/reaction kinetics/circulating fluidized bed/diffusion分类
能源科技引用本文复制引用
陈亮,王子铭,王春波..流化床锅炉内石灰石同时煅烧/硫化反应中煅烧动力学特性[J].化工学报,2017,68(12):4615-4624,10.基金项目
国家重点研发计划项目(2016YFB0600701) （2016YFB0600701）
中央高校基本科研业务费专项资金项目(2016XS105). supported by the National Key Research and Development Program of China (2016YFB0600701) and the Fundamental Research Funds for the Central Universities (2016XS105). （2016XS105）
