钙基吸收剂CCCR法脱除CO_2的固定床过程实验研究

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。

Experimental study on CCCR method with Ca-based absorbent to CO2 capture in the fixed bed process

In order to systematic study the combined effects of CO2 partial pressure in the calcination atmosphere,calcination temperature,water vapor and the number of cycles,and explore the dominant factor which make the concersion rate decrease in different conditions,though self-built 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 CO2 partial pressure is high.When calcination temperature is close to Tammann temperature sintering effect will be the dominat factor which makes X decline,CO2 has 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 temperature has little effect.The presence of water vapor in the calcination atmosphere could improve the conversion rate X.