高浓度CO_(2)气氛下水泥生料分解过程的试验和特性评估  

Experiments and characteristic evaluation of decomposition process of cement raw meals in high CO_(2) atmosphere

作　　者：徐越[1] 钟文琪[1] 周冠文[1] 陈曦[1] 赵小亮 辛美静 陈翼 朱永长 Xu Yue;Zhong Wenqi;Zhou Guanwen;Chen Xi;Zhao Xiaoliang;Xin Meijing;Chen Yi;Zhu Yongchang(Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing 210096,China;Sinoma International(Nanjing)Engineering Co.,Ltd.,Nanjing 211106,China)

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,南京210096 [2]中国中材国际工程股份有限公司(南京),南京211106

出　　处：《东南大学学报（自然科学版）》2022年第3期433-445,共13页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金山西联合基金资助项目(U1910214).

摘　　要：为掌握水泥生料在高浓度CO_(2)气氛中的分解特性并给出最佳操作建议,构建了水泥生料分解试验和分解特性评价系统,研究了不同反应气氛、反应温度、水泥生料质量分数对分解特性的影响,并采用非线性拟合方法进行特性评估.基于试验数据开展了水泥生料分解特性评估.结果表明,CO_(2)生成曲线峰值、排放总量和分解时间都随氧气体积分数的增加而增大,当气氛由21%O_(2)/79%CO_(2)转变为25%O_(2)/75%CO_(2)时较为明显.较高的分解温度和煤粉含量延长了水泥生料分解的时间,有助于提高CO_(2)的生成率和总量,增加分解产物中CaO的质量分数至71%以上.水泥生料在30%O_(2)/70%CO_(2)气氛下分解特性最佳,且较有利于CO_(2)捕集.当温度为1005℃时水泥生料分解特性评价指数最佳.水泥生料质量分数为94%时,燃料用量和分解特性处于最优平衡状态.To obtain the decomposition characteristics of cement raw meal in high CO_(2) atmosphere and give the best operation suggestion,an experimental evaluation system for the decomposition of cement raw meal in high CO_(2) atmosphere was developed.Effects of the reaction atmosphere,the reaction temperature,and the mass fraction of cement raw meals on decomposition characteristics were systematically studied,and characteristics were evaluated by a nonlinear fitting method.Based on the experimental data,the decomposition characteristics of cement raw meals were evaluated.The results show that the emission peak of CO_(2),the total amount of CO_(2) and the total decomposition time all increase with oxygen volume fraction.This is more obvious when the atmosphere changes from 21%O_(2)/79%CO_(2) to 25%O_(2)/75%CO_(2).Besides,the higher decomposition temperature and the higher proportion of coal prolong the time of cement raw meal decomposition process,thus improving high generation rate,total amount of CO_(2),and increasing the CaO mass fraction of the decomposition products to over 71%.The decomposition characteristics of cement raw meals at 30%O_(2)/70%CO_(2) are the best and favorable for CO_(2) capture during the experiment.The best evaluation index of decomposition characteristics of cement raw meals are achieved at a temperature of 1005℃.When the mass fraction of cement raw meals is 94%,both the coal consumption and the decomposition characteristics are in optimum equilibrium.

关 键 词：CO_(2)减排 水泥生料 分解特性 评估体系 

分 类 号：TQ172[化学工程—水泥工业]