Dynamic modelling and analysis of post-combustion CO2 chemical absorption process for coal-fired power plants
Dynamic modelling and analysis of post-combustion CO2 chemical absorption process for coal-fired power plants
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DOI：
10.1016/j.fuel.2010.05.030
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发表时间：
2010-10-01
期刊：
影响因子：
7.4
通讯作者：
Yeung, H.
中科院分区：
文献类型：
--
作者：
Lawal, A.;Wang, M.;Yeung, H.
使用MEA溶剂通过化学吸收的燃烧后捕集仍然是用于燃煤电厂的大规模CO2捕集的唯一商业技术。本文提出了一种燃烧后的CO2捕集装置的动态响应的建模和仿真研究。这种装置主要由吸收器（化学吸收CO2）和再生器（再生化学溶剂）组成。模型的开发和验证，然后动态分析的吸收塔和再生塔连接在一起，再循环。gPROMS（Process Systems Enterprise Ltd.）先进的工艺建模环境已被用于实施拟议的工作。该研究深入了解了吸收器-再生器组合的操作以及与发电厂集成操作可能产生的干扰。结果表明，吸收器的性能是更敏感的摩尔L/G比的液体溶剂和烟气的实际流量。此外，适当的水平衡的重要性，在吸收塔显示。再沸器负荷的阶跃变化指示缓慢的响应。研究了涉及两种基本CO2捕集技术（炉内部分富氧燃烧模式和燃烧后溶剂洗涤）的组合的情况。改变烟道气组成以模拟用组合观察到的烟道气组成。有一个最初的急剧下降，在CO2吸收水平，这可能不会被观察到在稳态模拟。(C)2010爱思唯尔有限公司保留所有权利。
Post-combustion capture by chemical absorption using MEA solvent remains the only commercial technology for large scale CO2 capture for coal-fired power plants. This paper presents a study of the dynamic responses of a post-combustion CO2 capture plant by modelling and simulation. Such a plant consists mainly of the absorber (where CO2 is chemically absorbed) and the regenerator (where the chemical solvent is regenerated). Model development and validation are described followed by dynamic analysis of the absorber and regenerator columns linked together with recycle. The gPROMS (Process Systems Enterprise Ltd.) advanced process modelling environment has been used to implement the proposed work. The study gives insights into the operation of the absorber-regenerator combination with possible disturbances arising from integrated operation with a power generation plant. It is shown that the performance of the absorber is more sensitive to the molar L/G ratio than the actual flow rates of the liquid solvent and flue gas. In addition, the importance of appropriate water balance in the absorber column is shown. A step change of the reboiler duty indicates a slow response. A case involving the combination of two fundamental CO2 capture technologies (the partial oxyfuel mode in the furnace and the post-combustion solvent scrubbing) is studied. The flue gas composition was altered to mimic that observed with the combination. There was an initial sharp decrease in CO2 absorption level which may not be observed in steady-state simulations. (C) 2010 Elsevier Ltd. All rights reserved.