Analytical first-principles-based model for sprays-based CO2 capture
Analytical first-principles-based model for sprays-based CO2 capture
复制标题
基于第一原理的喷雾二氧化碳捕集分析模型
DOI：
10.1016/j.ijggc.2023.103969
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发表时间：
2023
影响因子：
3.9
通讯作者：
Bahadur, Vaibhav
中科院分区：
文献类型：
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作者：
Bhati, Awan;Bilyaz, Serhat;Bahadur, Vaibhav
从烟道气或空气中去除CO2与溶剂和气流之间的总接触面积成正比。喷雾溶剂提供了由小尺寸的溶剂液滴产生的大面积/体积比的可能性。总传质（KGAv）是系统性能的重要指标，它表示在给定工作压力下每单位体积的总CO2捕集率。喷雾捕集系统的最大捕集速率为608 kmol/m3·hr。通过计算KGAv和捕集效率，建立了一个预测喷雾捕集系统中CO2传质的解析模型。使用两个实验研究的范围内的液体流速，入口溶剂负载，不同的喷嘴类型，和入口二氧化碳分压的模型预测进行验证。研究了CO2平衡分压（P*）与胺反应的相对重要性。结果表明，在高液速和低溶剂负荷条件下，CO2捕集率较高时，其对KGAv的影响较为突出。最后，研究了KGAv、总传质系数（KG）、有效面积（Av）、溶剂负载量（α）和气流中CO2摩尔分数（X C O 2）等关键参数沿着通道高度的变化，为特定操作条件下通道高度的优化提供了见解。
CO 2 removal from flue gases or air is directly proportional to the overall contact area between the solvent and gas flow. Spraying the solvent offers possibilities for large area/volume ratios resulting from the small size of solvent droplets. The overall mass transfer (K G A v) is a crucial indicator of the performance of the system and indicates the overall CO 2 capture rate per unit volume at given working pressure. The maximum capture rate of spray systems considered in this study is 608 kmol/m 3-hr. This study develops an analytical model to predict mass transfer in spray-based systems for CO 2 capture by evaluating K G A v and capture efficiency. Model predictions are validated using two experimental studies for a range of liquid flow rate, inlet solvent loading, different nozzle types, and inlet CO 2 partial pressure. The relative importance of the incorporation of equilibrium partial pressure of CO 2 (P*) into amine with respect to CO 2 partial pressure is also studied. It is found that its effect on K G A v is prominent in high liquid flow rate and low solvent loading regimes where the overall CO 2 capture is high. Finally, the variation of key parameters such as K G A v, total mass transfer coefficient (K G), effective area (A v), solvent loading (α), and mole fraction of CO 2 in the gas stream (X C O 2) along the channel height is studied, which gives insights on optimization of the channel height for specified operating conditions.