氨水吸收CO2的吸收热预测模型

doi:10.3969/j.issn.0438-1157.2013.09.001

化工学报 ›› 2013, Vol. 64 ›› Issue (9): 3079-3087.DOI: 10.3969/j.issn.0438-1157.2013.09.001

氨水吸收CO₂的吸收热预测模型

齐国杰¹, 王淑娟¹, YU Hai², 刘今朝¹, 陈昌和¹

1. 热科学与动力工程教育部重点实验室, 二氧化碳资源化利用与减排技术北京市重点实验室, 清华大学热能工程系, 北京 100084;
2. CSIRO Energy Centre, 10 Murray Dwyer Circuit, Mayfield West, NSW 2304, Australia

收稿日期:2013-01-08 修回日期:2013-02-04 出版日期:2013-09-05 发布日期:2013-09-05
通讯作者: 王淑娟
作者简介:齐国杰(1983- ),男,博士研究生。
基金资助:
国家自然科学基金项目(50876051);欧盟框架项目(241393)。

Prediction model of absorption heat for CO₂ capture using aqueous ammonia

QI Guojie¹, WANG Shujuan¹, YU Hai², LIU Jinzhao¹, CHEN Changhe¹

1. Department of Thermal Engineering, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory for CO₂ Utilization and Reduction Technology, Tsinghua University, Beijing 100084, China;
2. CSIRO Energy Centre, 10 Murray Dwyer Circuit, Mayfield West, NSW 2304, Australia

Received:2013-01-08 Revised:2013-02-04 Online:2013-09-05 Published:2013-09-05
Supported by:
supported by the National Natural Science Foundation of China(50876051)and the EU Framework Programme(241393).

摘要/Abstract

摘要： 基于e-NRTL模型,利用Aspen Plus软件建立了氨水吸收CO₂的吸收热预测模型,验证了NH₃-CO₂-H₂O体系的汽液平衡、液相组成形态并与前人的实验数据做了对比,进而结合负载CO₂的氨水溶液中各离子及分子的变化特征,对CO₂吸收过程的反应热随着CO₂负载量的变化规律进行了预测并与已发表的数据进行了比较。结果表明,该吸收热模型能够准确地实现氨水吸收CO₂过程中汽液平衡、液相反应以及吸收热的计算。氨水吸收CO₂的反应热主要受H₂O的电离、NH₃的电离、NH₂COO^-的生成与水解、CO₂的溶解等反应过程的影响,H₂O的电离过程受NH₃的电离过程的抑制,对于总吸收热的贡献最大, NH₂COO^-的反应则随着CO₂负载量的增加先放热再吸热。随着温度的升高,总吸收热有所降低,当温度为80℃时,在较低的CO₂负载区间[0.2～0.5 mol CO₂·(mol NH₃)^-1],总吸收热约为70.5 kJ·(mol CO₂)^-1。

关键词: 氨法脱碳, 二氧化碳, 模型, 再生能耗, 吸收热

Abstract: A model for the heat of absorption of CO₂ using ammonia was established in the Aspen Plus software based on the e-NRTL model.The vapor liquid equilibrium and speciation of the NH₃-CO₂-H₂O system were validated with the experimental data in literature.The heat of CO₂ absorption was predicted and compared with the experimental data,combined with the analysis of liquid composition in the CO₂ loaded aqueous ammonia.The results show that the model built in this paper can accurately calculate the vapor liquid equilibrium,speciation,as well as the heat of CO₂ absorption in the ammonia based CO₂ capture process.The heat of CO₂ absorption is mainly affected by the dissociation of H₂O and NH₃,formation and hydrolysis of NH₂COO^- and dissolution of CO₂ in the aqueous ammonia.The heat of H₂O dissociation has the largest proportion in the overall heat of CO₂ absorption,which is in restraint of the dissociation of NH₃.The reaction related to NH₂COO^- is exothermic first and then endothermic with the increase of CO₂ loading.As the temperature increases,the heat of CO₂ absorption decreases.The average heat of CO₂ absorption is 70.5 kJ·(mol CO₂)^-1,when the CO₂ loading is between 0.2—0.5 mol CO₂·(mol NH₃)^-1 and temperature is 80℃.

Key words: aqueous ammonia, carbon dioxide, modelling, heat of regeneration, heat of absorption

中图分类号:

TK09

齐国杰, 王淑娟, YU Hai, 刘今朝, 陈昌和. 氨水吸收CO₂的吸收热预测模型[J]. 化工学报, 2013, 64(9): 3079-3087.

QI Guojie, WANG Shujuan, YU Hai, LIU Jinzhao, CHEN Changhe. Prediction model of absorption heat for CO₂ capture using aqueous ammonia[J]. CIESC Journal, 2013, 64(9): 3079-3087.

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氨水吸收CO₂的吸收热预测模型

Prediction model of absorption heat for CO₂ capture using aqueous ammonia

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