Screening of flowsheet modifications for an efficient monoethanolamine (MEA) based post-combustion CO2 capture
Screening of flowsheet modifications for an efficient monoethanolamine (MEA) based post-combustion CO2 capture
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DOI：
10.1016/j.ijggc.2011.03.004
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发表时间：
2011-07
影响因子：
3.9
通讯作者：
Y. Moullec;M. Kanniche
中科院分区：
文献类型：
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作者：
Y. Moullec;M. Kanniche
本研究的目的是通过建模评估和比较文献中描述的大多数CO2捕集装置流程图修改。该过程的主要组成部分，吸收塔和汽提塔是专门围绕基于速率的模型与传质和化学动力学建模。用于研究的溶剂为单乙醇胺（MEA）。将不同的案例研究与在能耗方面表现出标准良好性能的参考案例进行比较（[公式：见正文]，1 atm）。它们对火力发电厂的影响也进行了简要的研究，以允许在工厂效率（电功率输出/煤的低热值）方面的性能比较。最好的单个简单修改是：在中等真空压力（约0.75巴）下操作的汽提塔，汽提塔的分级进料，贫溶剂蒸气压缩，塔顶汽提塔压缩。它们允许将效率损失降低4- 8%。一些其他的改进有助于该工艺的良好性能，例如：中间冷却器，改进的省煤器，锅炉冷凝水蒸汽压缩，效率损失降低约2%。这些单独的修改可以结合起来，以建立非常有效的过程，效率损失减少10%至25%。最后，一些大幅度的工艺改进可以非常显著地提高工艺性能，例如：先进的分流，效率损失减少约30%，或直接蒸汽汽提，效率损失减少27%。提出了工艺修改之间一对一相互作用的定性总结。这些工艺改进必须与新的溶剂和创新的发电厂热集成策略相结合，以显示基于胺的燃烧后捕获工艺的真正潜力。
The purpose of this study is to assess and compare most of the CO2capture unit flowsheet modifications described in the literature through modelling. The main component of the process, absorber and stripper were specifically modelled around a rate based model with mass transfer and chemical kinetics. The solvent used for the study is monoethanolamine (MEA). The different case studies are compared to a reference case presenting a standard good performance in term of energy consumption ( [Formula: see text] at 1atm). Their impact on the thermal power plant is also briefly studied in order to permit the performances comparison in term of plant efficiency (electric power output/coal lower heating value). The best individual simple modifications are: a stripper operating with moderate vaccum pressure (around 0.75bar), the staged feed of the stripper, the lean solvent vapour compression, the overhead stripper compression. They allow a decrease of efficiency penalty by 4–8%. Some other modifications contribute to the good performance of the process such as: intercooler, improved economizer, boiler condensate vapour compression, with a reduction of efficiency penalty around 2%. These individual modifications can be combined in order to build very efficient process with efficiency penalties reduction ranging from 10% to 25%. Finally, some drastic process modifications can improve very significantly the process performance such as: advanced split-flow with a reduction of efficiency penalty by around 30% or direct steam stripping with a reduction of efficiency penalty of 27%. A qualitative summary of one to one interaction between process modifications is proposed. These process modifications must be coupled with new solvents and innovative power plant heat integration strategies in order to show the true potential of the amine-based post-combustion capture processes.