摘要
利用微型流化床反应分析仪(MFBRA)和热重分析仪(TGA)分别测定了空气中碳酸钙的等温与非等温反应,并采用不同的数据处理方法对其分解动力学进行了对比研究.MFBRA增强了反应过程中传热传质以及有效消除气体外扩散对反应的影响,其测得的活化能(E=138.35 kJ·mol^(-1))和指前因子(A=1.58×10^(5) s^(-1))均低于TGA(E=209.95 kJ·mol^(-1),A=8.95×10^(7) s^(-1))获得的结果,但两者所测得的活化能均在文献报道的120~280 kJ·mol^(-1)范围内.此外,两种仪器得到的最概然机理函数模型均为收缩几何模型(圆柱形对称)G(x)=1-(1-x)^(1/2),表明了MFBRA在气固反应动力学表征方面的有效性和可靠性.
The isothermal and non-isothermal reactions of calcium carbonate decomposition were determined by micro fluidized bed reaction analyzer(MFBRA)and thermogravimetric analyzer(TGA),respectively,and different data processing methods were adopted to calculate the reaction kinetics.MFBRA enhances heat and mass transfer and effectively eliminates the effect of gas external diffusion on the reaction,resulting in lower obviously activation energy(E=138.35 kJ/mol)and pre-exponential factor(A=1.58×10^(5) s^(-1))than those obtained by TGA(E=209.95 kJ/mol,A=8.95×10^(7)s^(-1)),but both of activation energies are in the range of 120-280 kJ mol^(-1) reported in the literatures.In addition,the most suitable mechanism function model in both TGA and MFBRA follows the shrinking core model(cylindrical symmetry)G(x)=1-(1-x)^(1/2),revealing the reliability and effectiveness of MFBRA for kinetic characterization of gas-solid reaction kinetics.
作者
郝文倩
刘雪景
王可心
王樱澈
岳君容
丁茯
许光文
HAO Wenqian;LIU Xuejing;WANG Kexin;WANG Yingche;YUE Junrong;DING Fu;XU Guangwen(Shenyang University of Chemical Technology,Shenyang 110142,China;Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China)
出处
《沈阳化工大学学报》
CAS
2023年第1期1-7,共7页
Journal of Shenyang University of Chemical Technology
基金
科技部重点研发计划(2018YFF01011400)
国家自然科学基金(U1908201)。
关键词
微型流化床
动力学
气固反应
碳酸钙分解
micro fluidized bed
kinetics
gas-solids reaction
calcium carbonate decomposition