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首页> 外文会议>Lime: Building on the 100-year legacy of the ASTM Committee C07 >Manganese Levels in Limestone: Operational Issues in Wet Limestone Flue Gas Scrubbing Technologies
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Manganese Levels in Limestone: Operational Issues in Wet Limestone Flue Gas Scrubbing Technologies

机译：石灰石中的锰含量：湿石灰石烟气洗涤技术的操作问题

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Wet flue gas desulfurization (WFGD) systems have been operating in electric utility coal-fired boiler plants since sulfur dioxide emissions became regulated with a series of amendments to the Clean Air Act from 1971-1977. Since that time, significant improvements have been made in these system designs in terms of scrubbing performance; but scaling and the associated corrosion in limestone forced oxidation (LSFO) based WFGD towers continues to be a concern with scrubber operations. Scaling in a WFGD system is most often caused by operational factors; however, scaling can also form through undesirable side reactions. The formation of MnO_x has been observed in the cooling water systems of power plants for a number of decades. MnO_x scale deposition is understood through two oxidation mechanisms-one chemical and one biological. MnO_x scale can be formed through chemical oxidation with halogens or biocides. Biological oxidation of manganese (Mn) is the result of naturally occurring bacteria from fresh water sources. Understanding how MnO_x scale is formed is important; however, the associated corrosion is the deeper issue. Most research on industrial Mn scaling and corrosion has focused on the water source as the leading contributor; however, for WFGD systems, reagent limestone has been found to be a notable contributor of soluble Mn. The proper selection of limestone is important to reducing levels of soluble Mn in the system. This presentation will review several examples of the scaling and corrosion problems and what can be done to mitigate these problems in terms of limestone quality and operational conditions.
机译：自从1971年至1977年通过对《清洁空气法》进行的一系列修订对二氧化硫的排放量进行管制以来，湿法烟气脱硫（WFGD）系统一直在电力公用事业的燃煤锅炉工厂中运行。从那时起，这些系统的设计在洗涤性能方面已取得了显着改进；但是在洗涤器操作中，基于石灰石强制氧化（LSFO）的WFGD塔的结垢和相关腐蚀仍然是一个问题。 WFGD系统中的扩展通常是由操作因素引起的。但是，结垢也会通过不良的副反应形成。数十年来，在电厂冷却水系统中观察到了MnO_x的形成。 MnO_x垢沉积是通过两种氧化机理来理解的：一种是化学的，一种是生物的。 MnO_x水垢可通过用卤素或杀菌剂进行化学氧化形成。锰（Mn）的生物氧化是淡水来源的天然细菌的结果。了解MnO_x结垢的形成方式很重要。但是，相关的腐蚀是更深的问题。关于工业锰垢和腐蚀的大多数研究都集中在水作为主要贡献者。然而，对于WFGD系统，已发现试剂石灰石是可溶性Mn的显着贡献者。正确选择石灰石对于降低系统中的可溶性Mn含量很重要。本演讲将回顾结垢和腐蚀问题的几个示例，以及如何在石灰石质量和操作条件方面缓解这些问题。

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