Dynamic Modeling to Minimize Energy Use for CO2 Capture in Power Plants by Aqueous Monoethanolamine
Dynamic Modeling to Minimize Energy Use for CO2 Capture in Power Plants by Aqueous Monoethanolamine
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DOI：
10.1021/ie801385q
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发表时间：
2009-02
影响因子：
4.2
通讯作者：
Sepideh Ziaii;G. Rochelle;T. Edgar
中科院分区：
文献类型：
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作者：
Sepideh Ziaii;G. Rochelle;T. Edgar
建立了含30wt%单乙醇胺(MEA)的燃煤电厂CO2捕集过程的动态速率模型。该模型是在Aspen Custom Modeler的流程图中创建的，基于液体和汽相的膜理论。它考虑了平衡反应对传质、热力学非理想性和规整填料水力学的影响。利用该模型对汽提塔进行了稳态分析，以了解倾斜负荷和填料高度对总等效功的影响，从而找到使电厂损失功最小的最佳操作条件。提出了两种具有控制结构的动态策略，使汽提塔在电力高峰负荷和电价期间灵活运行。开环响应显示了所提出的动态策略在动态行为和稳态值方面的一些差异。其中一种方法是在还原碳源的基础上提高1%的脱碳率。
A dynamic rate-based model was developed for stripping in CO2 capture from coal-fired power plants with 30 wt % monoethanolamine (MEA). The model, created in a flow sheet of Aspen Custom Modeler, was based on the film theory for liquid and vapor phases. It takes into account the impact of equilibrium reactions on the mass transfer, thermodynamic nonidealities, and the hydraulics of the structured packing. With this model, steady state analyses were carried out for the stripper to understand the effect of the lean loading and the height of the packing on total equivalent work and find optimum operating conditions that minimize power plant lost work. Two dynamic strategies with control configurations are proposed to run the stripper in a flexible operation during the period of electricity peak load and prices. Open loop responses demonstrated some differences in dynamic behavior and steady state values for proposed dynamic strategies. One of the approaches increased the CO2 removal by 1% at the reduced stea...