Enhanced weathering to capture atmospheric carbon dioxide: Modeling of a trickle-bed reactor
Enhanced weathering to capture atmospheric carbon dioxide: Modeling of a trickle-bed reactor
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增强风化以捕获大气中的二氧化碳：滴流床反应器的建模
DOI：
10.1002/aic.17202
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发表时间：
2021
期刊：
影响因子：
3.7
通讯作者：
Xing L
中科院分区：
文献类型：
--
作者：
Xing L
碱性矿物的强化风化（EW）有可能从大气中捕获十亿吨规模的二氧化碳，但反应器设计提出了巨大的挑战。我们用淡水在 1-10mm 方解石颗粒的逆流滴流填充床中模拟 EW。风化动力学与 CO2 的传质相结合，并通过化学反应增强传质。为了避免洪水，必须降低流速，因为颗粒因电波而收缩。捕获率主要受到二氧化碳从气体到液体的缓慢转移的限制，尽管方解石的缓慢溶解在某些情况下也可以发挥作用。床层高度至少需要 7-8 m，才能提供足够的停留时间。结果强调需要提高捕获率并减少能源和水的消耗，可能通过在进料中富含二氧化碳和进一步化学加速传质来实现。
Enhanced weathering (EW) of alkaline minerals can potentially capture CO2from the atmosphere at gigaton scale, but the reactor design presents great challenges. We model EW with fresh water in a counter‐current trickle flow packed bed batch of 1–10 mm calcite particles. Weathering kinetics are integrated with the mass transfer of CO2incorporating transfer enhancement by chemical reaction. To avoid flooding, flow rates must be reduced as the particles shrink due to EW. The capture rate is mainly limited by slow transfer of CO2from gas to liquid although slow dissolution of calcite can also play a role in certain circumstances. A bed height of at least 7–8 m is required to provide sufficient residence time. The results highlight the need to improve capture rate and reduce energy and water consumption, possibly through enriching the feed with CO2and further chemical acceleration of the mass transfer.