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Review of the Role of Aqueous Chemistry in Mercury Removal by Acid Gas Scrubbers on Incinerator Systems

机译：水化学在焚化炉系统上的酸性气体洗涤塔脱除汞中的作用综述

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摘要

Incinerators that process mercury-containing feedstocks need to remove mercury from the flue gas with sufficient efficiency to meet regulations for mercury emissions from the stack. Equipment designed to remove other pollutants, such as acid gases and particulate matter, can remove mercury as well, under certain conditions. Acid gas scrubbers, designed to remove compounds such as HC1 and SO_2, can remove mercury, when the latter is found in the flue gas in an oxidized form. There is a growing body of evidence that mercury, once absorbed into the scrubbing solution, can be reduced back to the nonsoluble elemental form, resulting in little net capture of mercury. Dissolved sulfur compounds in the scrubbing solution play an important role in the reduction of absorbed mercury. In this paper, the mechanisms for mercury capture and release in scrubbing solutions are presented. Conditions that promote or inhibit retention of mercury in scrubbers are discussed, as well as the use of additives to improve mercury retention in scrubbers.
机译：处理含汞原料的焚化炉需要以足够的效率从烟道气中除去汞，以满足烟囱中汞排放的规定。在某些条件下，旨在去除酸性气体和颗粒物等其他污染物的设备也可以去除汞。当在烟道气中以氧化形式发现汞时，设计用于去除HCl和SO_2等化合物的酸性气体洗涤塔可以去除汞。越来越多的证据表明，一旦汞被吸收到洗涤液中，就可以还原为不溶性元素形式，从而导致汞的净捕集很少。洗涤溶液中溶解的硫化合物在减少吸收的汞中起重要作用。本文介绍了洗涤溶液中汞的捕获和释放机理。讨论了促进或抑制洗涤塔中汞保留的条件，以及使用添加剂改善洗涤塔中汞的保留。

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