Flue gas desulfurisation is a prerequisite for successful CO₂ capture in coal‐fired power stations utilising aqueous amine absorbents. For nations like Australia, where there is nonexistence of mandatory flue gas desulfurisation, this increases the cost for power plants retrofitting CO₂ capture. The CSIRO's CS‐Cap process, a potentially low cost method for combined CO₂ and SO₂ capture, provides an alternate sulfur management solution to such plants. The CS‐Cap process, however, results in high sulfur‐loaded amines that require continuous regeneration to retain cost benefits. Reactive crystallisation by KOH addition is shown to be successful in removing the bulk of the sulfate from aqueous amines without any additional heating or cooling requirements. Increasing initial sulfate loading by amine recycling initially improves sulfate removal efficiency, up to the postsaturation level where the systems ionic strength determines further sulfate solubility. Oxidative amine degradation had no significant effect on the precipitation efficiency or purity of K₂SO₄ crystals apart from their slight discoloration. The behaviour of the residual potassium in these regenerated aqueous amines needs further investigation as it could lead to unwanted precipitation inside the absorber column and other parts of the process.

中文翻译：

---

通过反应性结晶再生富硫酸盐的燃烧后捕获胺

烟气脱硫是使用胺类吸收剂的燃煤电厂成功捕获CO ₂的前提。对于像澳大利亚这样不存在强制性烟气脱硫的国家，这会增加电厂改造CO ₂捕集的成本。CSIRO的CS-Cap工艺是将CO ₂和SO ₂混合使用的潜在低成本方法捕集，为此类工厂提供了另一种硫磺管理解决方案。但是，CS-Cap工艺会产生高硫含量的胺，需要连续再生才能保持成本优势。已证明通过添加KOH进行反应性结晶可成功地从胺水溶液中去除大部分硫酸盐，而无需任何其他加热或冷却要求。通过胺再循环增加初始硫酸盐负载量最初会提高硫酸盐去除效率，直至达到系统饱和后的离子强度决定系统进一步溶解硫酸盐的水平。氧化胺的降解对K ₂ SO ₄的沉淀效率或纯度没有明显影响晶体除轻微变色外。这些再生的胺水溶液中残留钾的行为需要进一步研究，因为它可能导致吸收塔内以及过程中其他部分产生不希望的沉淀。