烟气调质过程中天然碱的碳酸化特性  

Carbonation Behavior of Trona During Flue Gas Conditioning Process

作　　者：罗浩东[1] 张淑慧[1] 张立强[1] 王志强[1] 崔琳[1] 董勇[1] Luo Haodong;Zhang Shuhui;Zhang Liqiang;Wang Zhiqiang;Cui Lin;Dong Yong(National Engineering Laboratory for Coal-Fired Pollutants Emission Reduction;Key Laboratory of Energy Carbon Reduction and Resource Utilization of Shandong Province,Shandong University,Jinan 250061,China)

机构地区：[1]山东大学燃煤污染物减排国家工程实验室,山东省能源碳减排技术与资源化利用重点实验室,济南250061

出　　处：《燃烧科学与技术》2017年第2期147-152,共6页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51206097)

摘　　要：在常压固定床反应实验台上,研究了烟气调质天然碱过程中天然碱的碳酸化特性,考察反应前后天然碱表面形态的变化以及反应温度、CO_2和水分体积分数对天然碱碳酸化反应的影响,并借助失活模型对天然碱的碳酸化过程进行了反应动力学模拟.结果表明:碳酸化反应后天然碱表面形态发生明显变化,反应后天然碱结构疏松,内部孔隙增多;反应温度的降低提高了天然碱碳酸化的反应速率常数,使得天然碱的碳酸化反应加快,反应温度分别为50℃、60℃和70℃时,天然碱的转化率分别为50%、31%,和24%;随着水分体积分数的增加天然碱的转化率迅速增加,当水分体积分数为4%时,天然碱的最高转化率仅为10%,而当水分体积分数为20%时,最高转化率可达52%;CO_2体积分数的增加也显著提高了反应速率常数,促进碳酸化反应的进行;失活模型均能较好地模拟天然碱的碳酸化过程,其相关系数均大于95%.The carbonation behavior of trona during flue gas conditioning process was evaluated in a fixed-bedreactor.The effect of temperature,CO2and H2O on the conversion reaction was investigated,and the structuralchange of trona particles was also considered.The results show that the structure varies as the carbonation reactionproceeds.Trona particle is initially nonporous and then begins to crack.The conversion of trona to NaHCO3increaseswith the decrease of reaction temperature.In the case of50,℃,60,℃and70,℃,the carbonation conversionof trona is50%,,31%,and24%,,respectively.The conversion of trona increases with the increase of watervapor.In the case of4%,water content,the conversion is10%,,while in the case of20%,water content,the reactionconversion reaches52%,.The CO2content has the same effect on carbonation reaction.The deactivation modelwas used to explain the kinetics of the carbonation of trona.The model showed good agreement with the experimentaldata obtained from the conversion reaction of trona to NaHCO3,with the average correlation coefficient of0.95.

关 键 词：天然碱 烟气 CO2 碳酸化 失活模型 

分 类 号：TQ531.9[化学工程—煤化学工程]