Straatman Paul J T, van Sark Wilfried G J H M
Indorama Ventures Europe B.V., Markweg 201, Harbour number 63473198, NB Europoort, the Netherlands.
Utrecht University, Copernicus Institute of Sustainable Development, Princetonlaan 8a, 3584 CB Utrecht, the Netherlands.
iScience. 2021 Jun 19;24(7):102754. doi: 10.1016/j.isci.2021.102754. eCollection 2021 Jul 23.
In this paper, we propose a low-cost method to capture and purify CO from ocean water indirectly from the atmosphere. Atmospheric CO dissolves in seawater following Henry's law. In open-cycle ocean thermal energy conversion (OC-OTEC), being a heat engine, large quantities of water are used to generate electricity from temperature differences in the ocean. CO and other gases dissolved in seawater are extracted from seawater by a vacuum compressor, being essential for heat transfer in OC-OTEC. Non-condensable gases containing CO from OC-OTEC are currently considered a waste gas stream. Based on literature, we calculate cold water non-condensables containing up to 14% CO. These non-condensables can be refined further to 80-90% purity with a water absorption process, inspired by those as used in the biogas industry. Levelized CO capture and purification costs were estimated to be 15-35 euro per ton, as only refinement costs are allocated of a waste gas stream of OC-OTEC.
在本文中，我们提出了一种低成本方法，用于从大气中间接捕获和净化海水中的一氧化碳。大气中的一氧化碳根据亨利定律溶解于海水中。在开式循环海洋热能转换（OC-OTEC）中，作为一种热机，大量海水被用于利用海洋中的温差发电。溶解在海水中的一氧化碳和其他气体通过真空压缩机从海水中提取出来，这对于OC-OTEC中的热传递至关重要。目前，OC-OTEC产生的含一氧化碳的不可冷凝气体被视为废气流。根据文献，我们计算出冷水不可冷凝物中一氧化碳含量高达14%。受沼气行业所用方法的启发，通过吸水过程，这些不可冷凝物可进一步提纯至纯度80-90%。由于仅分配了OC-OTEC废气流的提纯成本，因此平准化一氧化碳捕获和净化成本估计为每吨15-35欧元。
