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Simulation of CO_2 capture using MEA scrubbing: a flowsheet decomposition method

机译：使用MEA洗涤模拟CO_2捕集：流程图分解方法

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Technically, the capture of CO_2 from the flue gas of natural gas/coal fired power plants, using a mono-ethanolamine (MEA) absorption process is a viable short to medium term strategy for mitigation of the atmospheric CO_2 emissions from large point sources. The costs, however, of such systems are currently perceived to be too high to be economically feasible. A practical research objective is the analysis of the CO_2 capture process with a view towards minimizing the cost of implementation. Because large scale CO_2 capture operations are expensive, process simulation and modelling have an important role to play in evaluation of the process alternatives. In the case of amine scrubbing, the convergence of the process flow sheet is a nontrivial exercise due to the highly nonlinear nature of the process and the large recycle stream involved. This paper presents a method of decomposing the flow sheet that assists in converging the process flow sheet and in optimizing key process operating variables, in particular the amine loadings and temperature of MEA entering the stripper. This method was applied to three different CO_2 concentrations (molar fraction, wet basis): 3% (to simulate flue gas from a gas turbine), 14% (flue gas from a coal plant) and 25% (flue gas from a cement plant). The decomposition method proved useful for investigation of the process parameters in both the absorber and the stripper. The results from the decoupled flow sheet provided good initial estimates for the convergence of the integrated flow sheet. The results from the decoupled and integrated flow sheets were similar. A minimum reboiler duty was found at a lean MEA loading of 0.25 for all CO_2 concentrations studied.
机译：从技术上讲，使用单乙醇胺（MEA）吸收过程从天然气/燃煤发电厂的烟气中捕获CO_2是缓解大型点源大气CO_2排放的可行的中短期策略。然而，目前认为这种系统的成本太高而在经济上不可行。一个实际的研究目标是对CO_2捕集过程的分析，以期将实施成本降至最低。由于大规模的CO_2捕集操作非常昂贵，因此过程模拟和建模在评估过程替代方案中起着重要作用。在胺洗涤的情况下，由于工艺的高度非线性性质和所涉及的大循环流，工艺流程图的收敛是不平凡的。本文介绍了一种分解流程图的方法，该方法有助于收敛过程流程图并优化关键的过程操作变量，特别是胺的负载量和进入汽提塔的MEA的温度。此方法应用于三种不同的CO_2浓度（摩尔分数，湿基）：3％（模拟来自燃气轮机的烟道气），14％（燃煤厂的烟道气）和25％（水泥厂的烟道气） ）。分解方法证明对研究吸收塔和汽提塔中的工艺参数很有用。解耦流程图的结果为集成流程图的收敛提供了很好的初始估计。解耦和集成流程图的结果是相似的。对于所有研究的CO_2浓度，在MEA贫油量为0.25时，发现了最小的再沸器负荷。

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