高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (1): 100.

• 论文 • 上一篇    下一篇

复合钙硅固硫剂的固硫反应动力学研究

郭锋1,2, 武增华1,2, 崔爱莉1, 王立新2   

  1. 1. 清华大学化学系, 北京 100084;
    2. 清华大学深圳研究生院, 深圳 518057
  • 收稿日期:2001-11-28 出版日期:2003-01-24 发布日期:2003-01-24
  • 通讯作者: 郭　锋(1978年出生),男,硕士研究生,从事煤的催化燃烧和脱硫研究.E-mail:flyinfire97@mails.tsinghua.edu.cn E-mail:flyinfire97@mails.tsinghua.edu.cn
  • 基金资助:

    国家基础研究规划项目(批准号:G1999022205);清华大学基础研究基金(批准号:JC1999051)资助

Desulfurization and Kinetic Studies on CaCO3-SiO2 Complex Desulfurization Reagent

GUO Feng1,2, WU Zeng-Hua1,2, CUI Ai-Li1, WANG Li-Xin2   

  1. 1. Department of Chemistry, Tsinghua University, Beijing 100084, China;
    2. Shenzhen Graduate School of Tsinghua University, Shenzhen 518057, China
  • Received:2001-11-28 Online:2003-01-24 Published:2003-01-24

PDF (PC)

被引次数

21

摘要： 用机械混合法、沉淀法及溶胶-凝胶法制备了Ca-Si系列复合固硫剂,并用热分析法分别研究其固硫性能和固硫过程,用等效粒子模型对固硫反应的动力学过程进行表征,计算了各固硫反应的动力学参数.研究结果表明,氧化钙固硫动力学参数活化能与指前因子之间存在着耦合现象,即反应活化能Ea下降时,指前因子k0相应下降,反之,活化能增加时,指前因子相应增加.用不同方法制备的Ca-Si复合固硫剂的固硫性能和固硫过程有明显差别,但其固硫率都高于纯CaCO3,其中溶胶-凝胶法效果最好;Ca-Si系列复合固硫剂对固硫反应的影响表现为在反应初期(即化学反应控制阶段),其反应速率较纯CaCO3的低;而到反应后期(即产物层扩散控制阶段),其反应速率显著增加,固硫反应温度越高,这种影响越明显,与固硫转化率的实验结果非常吻合.

关键词: 钙硅复合固硫剂, 固硫反应, 动力学, 耦合

Abstract: In this paper, Ca-Si complex desulfurization reagent was prepared by precipitation, sol-gel and mixing method. Then the effect on desulfurization among differet samples was studied. The grain model of the reaction kinetic was used. It is shown that this model can describe the course of desulfurization. Different samples have different effects on the kinetic parameter such as Ea and k0, which couple to each other(the accretion of Ea always accompanies the accretion of k0 and vice versa). The sol-gel-Ca-Si reagent gives the best performance on desulfurization. At the beginning of the reaction, the complex Ca-Si reagent shows the slow rate, but in the end, it is obviously faster, further more, the higher the temperature of the reactions, the greater the effect.

Key words: Ca-Si complex desulfurization reagent, Desulfurization, Kinetic, Coupling

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