Potential of enhanced weathering of calcite in packed bubble columns with seawater for carbon dioxide removal
Potential of enhanced weathering of calcite in packed bubble columns with seawater for carbon dioxide removal
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DOI：
10.1016/j.cej.2021.134096
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发表时间：
2021-12
影响因子：
15.1
通讯作者：
Lei Xing;H. Pullin;L. Bullock;P. Renforth;R. Darton;A. Yang
中科院分区：
文献类型：
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作者：
Lei Xing;H. Pullin;L. Bullock;P. Renforth;R. Darton;A. Yang
增强矿物的风化作用是从大气中去除二氧化碳以帮助应对气候变化的一种选择。在这项工作中，我们考虑的方解石与海水的风化反应器中使用的空气富含二氧化碳。建立了填料鼓泡塔反应器的数学模型，并对模型中的关键传质和化学反应组分进行了实验验证。连续过程的建模结果揭示了在比能耗和CO2捕集率方面的性能，其受包括颗粒尺寸、气体和液体的表观速度、反应器床层高度和进料CO2浓度的参数的影响。主要的能源需求是用于泵送液体和压缩气体，以及用于CO2浓缩;供应固体颗粒（采矿作业、运输和粉碎）所需的能源相对较少。地面面积要求（由CO2捕获率决定）和能源要求之间可能存在权衡。为了在反应器中捕获1吨CO2，最佳设计预计消耗2.1-2.3 GJ的电力，并占用1.8-5.2 m2年的空间，这取决于进料CO2浓度。考虑到海洋中风化产物的脱气作用，每吨捕获的CO2将增加到5.7-8.2 GJ和7.1-13.1 m2年。这种增加的能源强度仍然在之前报告的二氧化碳去除方案的范围内，而空间需求量化为该计划未来的可行性评估提供了重要信息。
Enhanced weathering of minerals is one option being considered for removing CO2from the atmosphere to help combat climate change. In this work, we consider the weathering of calcite with seawater in a reactor using air enriched with CO2. A mathematical model of the packed bubble column reactor was constructed with the key mass transfer and chemical reaction components validated with experimental data. The modelling results for a continuous process reveal the performance in terms of the specific energy consumption and the CO2capture rate, which are affected by parameters including particle size, superficial velocities of gas and liquid, reactor bed height and feed CO2concentration. The major energy requirements are for pumping liquid and compressing gas, and for CO2enrichment; energy needed for supplying solid particles (mining operations, transport and comminution) was found to be comparatively minor. A trade-off was possible between ground area requirement (determined by CO2capture rate) and energy requirement. To capture 1 tonne of CO2at the reactor, optimal designs were predicted to consume 2.1–2.3 GJ of electricity and occupy 1.8–5.2 m2year of space, depending on the feed CO2concentration. These would increase to 5.7–8.2 GJ and 7.1–13.1 m2year per tonne of CO2captured, after allowing for degassing of the weathering product in the ocean. This increased energy intensity is still within the range of the CO2removal options previously reported, while the space requirement quantification provides essential information for future feasibility assessment of this scheme.