Advances in calcium carbonate thermal decomposition

doi:10.11949/j.issn.0438-1157.20150670

Abstract

Abstract:

The reaction of thermal decomposition of CaCO₃ to produce CaO and CO₂ is an important reaction during the Ca-looping process. The Ca-looping process has great potential in environmental and energy application, such as flue gas decarbonization, H₂ production from a reactive sorption enhanced reforming process and sun heat energy storage. One essential criterion to evaluate the properties of CaCO₃ thermal decomposition is the decomposition temperature and the decomposition rate. From the decomposition mechanism, thermodynamics and kinetics, this paper analyses the effect of the selected factors on the decomposition temperature and rate, including particle size, microstructure and composition, heating rate, decomposition atmosphere and pressure. The summarization of the research above is to provide reference methods for accelerating the thermal decomposition and reducing the energy consumption in decomposition during the industrial applications.

Key words: calcium carbonate, decomposition temperature, thermodynamics, microstructure, reaction kinetics

摘要：

CaCO₃热分解产生CaO与CO₂的反应,是钙循环过程中CaCO₃再生的重要反应。钙循环过程在烟气脱碳、反应吸附强化甲烷蒸气重整制氢以及太阳热能储存等过程中都有重要应用。评价CaCO₃热分解的重要性能是分解温度和分解速率。本文从CaCO₃分解机理、热力学和反应动力学方面,分析了颗粒粒径、结构和组成以及加热速率、分解气氛和分解压力等变量对CaCO₃分解温度和分解速率的影响,为工业应用时降低CaCO₃分解温度、提高分解速率、减少分解能耗的研究提供了参考。

关键词: 碳酸钙, 分解温度, 热力学, 显微结构, 反应动力学

CLC Number:

TQ031.3

LU Shangqing, WU Sufang. Advances in calcium carbonate thermal decomposition[J]. CIESC Journal, 2015, 66(8): 2895-2902.

卢尚青, 吴素芳. 碳酸钙热分解进展[J]. 化工学报, 2015, 66(8): 2895-2902.

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