摘要
在大功率碳管炉内模拟利用转炉余热闪速加热高温煅烧石灰石的工艺过程,研究煅烧温度（1200-1500℃）和石灰石粒径（4-27.5mm）对石灰石颗粒在高温热分解过程中CO2 逸出行为的影响.结果表明,石灰石粒径一定时,煅烧温度越高,CaCO3 分解初期逸出CO2 的速率越大,达到CO2 逸出速率最大值的时间也越短;煅烧温度一定时,石灰石粒径越小,CO2 逸出速率曲线峰值越高,到达曲线峰值的时间也越短.煅烧温度不超过1300℃时,随着石灰石粒径的增大,试样转化率和CO2 逸出速率的变化明显放缓;而煅烧温度达到1350℃后,粒径对CO2 逸出速率的影响较小.在1500℃煅烧温度下,经过400-445s,不同粒径石灰石颗粒的分解转化率均已接近100%.
The thermal decomposition process of limestone which was heated extremely quickly to calcination temperature by converter waste heat was simulated in a carbon tube furnace with high power.The influence of calcination temperature(1200~1500℃)and particle size(4~27.5mm)of limestone on the evolution behavior of CO_2 from the calcined limestone was analyzed.The results show that,when the particle size of limestone is constant,evolution rate of CO_2 during the early stage of CaCO_3 decomposition increases and the time to reach the maximum rate is reduced as the calcination temperature rises;at a given calcination temperature,the smaller the particle size of limestone is,the higher the CO_2 evolution rate and the shorter the time to reach the peak value of the rate curve would be.When calcination temperature is lower than 1300 ℃,the changes in CaCO_3 conversion rate and CO_2 evolution rate of the samples obviously slow down with the increase of limestone particle size,while the particle size has less effect on CO_2 evolution rate at higher calcination temperature(≥1350 ℃).All of the limestone samples possess the decomposition conversion rate of almost 100% when calcined at 1500 ℃for 400~445s.
出处
《武汉科技大学学报》
CAS
北大核心
2015年第6期419-423,共5页
Journal of Wuhan University of Science and Technology
基金
国家自然科学基金资助项目(51374160)
关键词
石灰石
高温煅烧
闪速加热
CO2
气体逸出
转炉炼钢
limestone
high temperature calcination
flash heating
CO2
gas evolution
converter steelmaking
