Dynamic analysis of the main components of the absorption process of capturing CO2 with Mg(OH)2 slurry

doi:10.16085/j.issn.1000-6613.2017-0586

Abstract

Abstract: In order to explore the principle of CO₂ capturing by Mg(OH)₂ slurry in bubble column,experiments and theoretical simulation were selected to analyze the component concentration dynamic variation in Mg(OH)₂-CO₂-H₂O system.The research revealed that there are three stages on the basis of the reaction products in absorption process, namely, CO₂ reacting with dissolved Mg(OH)₂ in the slurry to generate Mg(HCO₃)₂ in the first stage, Mg(OH)₂ particles continueously dissolving and being carbonized into MgCO₃ in the second stage,CO₂ being captured by MgCO₃ in the third stage. With CO₂ concentration enrichment,the second stage disappeares in high CO₂ concentration(volume fraction is 20%-30%)absorption process. When CO₂ partial pressure is constant,reaction time of the first stage almost has noting to do with Mg(OH)₂ concentrtion,reaction time of the second and third stage and MgCO₃ solid content at quilibrium are proportional to Mg(OH)₂ concentrtion. Reaction time of the first stage varies inversely to temperature(20-50℃). Reaction time of the second and third stage are shortened with temperature increasing at low temperature zone(20-35℃),while it is exactly the opposite at high temperature zone(35-50℃). The shortest time it took to reach the quilibrium state occurs around 35℃.

Key words: bubble column, magnesium hydroxide, carbon dioxide, absorption

摘要： 为了探究Mg（OH）₂浆液在鼓泡塔中吸收CO₂的过程原理，采用实验和理论计算对Mg（OH）₂-CO₂-H₂O吸收体系进行了组分浓度动态分析。研究结果表明：该吸收过程依据反应产物可分为3个阶段，第一阶段为Mg（OH）₂与CO₂反应生成Mg（HCO₃）₂的过程，第二阶段为Mg（OH）₂将CO₂固定为MgCO₃的过程，第三阶段为MgCO₃对CO₂的吸收过程；随着气相CO₂浓度升高，可发现高浓度（体积分数20%～30%）吸收过程会出现第二阶段消失的特殊现象；当CO₂分压一定时，第一阶段反应时间长度几乎不随Mg（OH）₂浓度而变化，第二阶段和第三阶段反应时间长度则与Mg（OH）₂浓度成正比，平衡时生成的MgCO₃固体含量与浆液初始浓度成正比；20～50℃，第一阶段反应时间长度与温度成反比，低温区间（20～35℃），第二阶段和第三阶段反应时间长度随温度升高而缩短，高温区间（35～50℃）则相反，35℃左右，吸收达到平衡时间最短。

关键词: 鼓泡塔, 氢氧化镁, 二氧化碳, 吸收

CLC Number:

X131.1

HE Zhicheng, LI Liqing, XIE Pengfei, WANG Chunhao, MO Yamian. Dynamic analysis of the main components of the absorption process of capturing CO₂ with Mg(OH)₂ slurry[J]. Chemical Industry and Engineering Progress, 2017, 36(12): 4664-4671.

何志成, 李立清, 谢鹏飞, 汪椿皓, 莫雅绵. Mg(OH)₂浆液吸收脱碳过程的组分动态分析[J]. 化工进展, 2017, 36(12): 4664-4671.

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Dynamic analysis of the main components of the absorption process of capturing CO₂ with Mg(OH)₂ slurry

Mg(OH)₂浆液吸收脱碳过程的组分动态分析

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