摘要
为了系统研究煅烧气氛中CO2分压力、煅烧温度、水蒸汽及循环次数对碳酸化转化率X的综合影响,探究在不同工况下使转化率衰减的主导因素,通过自建固定床反应实验台,在多工况下进行了实验研究,并用氮吸附法测量吸收剂煅烧产物微观结构进行分析。结果表明:850℃以上随煅烧温度的提高,碳酸化转化率X逐渐下降,高CO2气氛下,此下降趋势将被减缓;煅烧温度接近窗口温度时,烧结作用为X下降主导因素,CO2则影响不大;多次循环过程中,高CO2分压气氛下,CO2作为烧结媒介,在转化率下降过程中起主要作用,煅烧温度影响不大;煅烧气氛中水蒸汽的存在可在一定程度上使碳酸化转化率提高。
In order to systematic study the combined effects of CO2partial pressure in the calcination atmosphere, calci- nation temperature, water vapor and the number of cycles, and explore the dominant factor which make the concersion rate decrease in different conditions, though self-buih bench, carry out experimental study in different conditions, and analyze the microstructure of the calcined product of the absorbent by nitrogen adsorption method. Results illustrate that above 850 ℃ carbonation conversion rate X decreases gradually with calcination temperature increases, this downward trend will be slow down when the CO2partial pressure is high. When calcination temperature is close to Tammann temper- ature sintering effect will be the dominat factor which makes X decline, CO2has little effect. In the cyclic process, when the CO2 partial pressure is high, as sintering media, CO2 plays a major role in X reduction process, calcination tempera- ture has little effect. The presence of water vapor in the calcination atmosphere could improve the conversion rate X.
出处
《华北电力大学学报（自然科学版）》
CAS
北大核心
2012年第5期77-81,共5页
Journal of North China Electric Power University：Natural Science Edition
基金
国家自然科学基金资助项目(50876030)
中央高校基本科研业务费专项资金资助(11MG46)
关键词
钙基吸收剂
煅烧
碳酸化
CO2分压力
水蒸汽
Ca-based absorbent
calcination
carbonation
CO2 partial pressure
water vapor
