Water production through CO2 capture in coal‐fired power plants
Water production through CO2 capture in coal‐fired power plants
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DOI：
10.1002/ese3.179
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发表时间：
2017-10
影响因子：
3.8
通讯作者：
P. Feron;R. Thiruvenkatachari;A. Cousins
中科院分区：
文献类型：
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作者：
P. Feron;R. Thiruvenkatachari;A. Cousins
提出了一种新型的基于液体吸收剂的CO2捕集和脱盐集成工艺。它是基于使用正渗透操作来代替捕获过程中的微调冷却器。该冷却器控制吸收器的吸收液体入口温度。在正向渗透操作中，水从盐溶液转移到吸收液体。它可以通过两种方式回收：通过解吸塔的塔顶冷凝器或通过在真空下闪蒸吸收液体的中间冷却操作，然后冷凝产生的水蒸气。在这两种情况下，水生产过程的能量需求被认为是可以忽略的，因为它是捕获过程的能量需求的一部分。产出水的量及其质量使得其可用作烟道气脱硫的补充和/或冷却塔补充。因此，它可以为现有燃煤发电站CO2捕集改造导致的特定冷却水需求增加提供解决方案。在本研究中，将单乙醇胺和甘氨酸钠溶液作为吸收液进行评价。由于高渗透压和低蒸汽压，氨基酸盐溶液是优选的，为高水质提供了最佳选择。
A novel integrated liquid absorbent‐based CO2 capture and desalination process is proposed. It is based on the use of a forward osmosis operation replacing the trim cooler in the capture process. This cooler controls the absorption liquid inlet temperature to the absorber. In the forward osmosis operation water is transferred from a saline solution to the absorption liquid. It can be recovered in two ways: via the overhead condenser of the desorber or via an intercooling operation by flashing the absorption liquid under vacuum, followed by condensation of the water vapor produced. In both cases the energy requirement for the water production process is considered negligible as it is part of the energy requirement of the capture process. The amount of produced water and its quality is such that it can be used as makeup for flue gas desulphurization and/or cooling tower makeup. Thus, it can provide a resolution for the increase in specific cooling water requirement as a result of a CO2 capture retrofit to an existing coal‐fired power station. Monoethanolamine and sodium glycinate solutions were evaluated as absorption liquids in this study. Amino acid salt solutions are preferred because of the high osmotic pressure and low vapor pressure, providing the best option for high water quality.