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首页> 外文期刊>Fuel Processing Technology >Enrichment of inorganic trace pollutants in re-circulated water streams from a wet limestone flue gas desulphurisation system in two coal power plants
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Enrichment of inorganic trace pollutants in re-circulated water streams from a wet limestone flue gas desulphurisation system in two coal power plants

机译：两个燃煤电厂湿石灰石烟气脱硫系统的再循环水流中富集无机痕量污染物

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摘要

The enrichment of inorganic trace pollutants in re-circulated water streams was studied at two power plants equipped with wet limestone Flue Gas Desulphurisation (FGD) system from the first re-circulation cycle of water up to the start of sampling campaigns. To elucidate the enrichment of inorganic trace pollutants as result of water re-circulation, a partial and total mass balances were undertaken. A t-Student analysis was performed to ascertain whether the mean contribution of filtered water affected the balance of elements and the enrichment of this water stream. The t-Student revealed the mean contribution of filtered water to total mass balance was statistically significant (p<0.05) for Na, Mg, Cl, B, Mn, Se, Cd, Mo, and U at first plant, and Na, Cl, K, Mg, Hg, Li, B, F, Ni, Zn, Mn, Co Sc, Ge, Se, at the second one. High levels of inorganic trace pollutants in filtered water could be affected by limestone purity, electrostatic precipitator gas temperature, use of additives, fluoride and/or sulphate complexes, and the S/F and S/Cl ratios in the scrubber, which may reduce the gaseous retention efficiencies in FGD and increase the emission of metals by entraining and/or evaporation of droplets as particulate matter from gypsum slurry.
机译：在两个装有湿式石灰石烟气脱硫（FGD）系统的发电厂中，研究了从循环水到第一次采样的过程中，循环水流中无机痕量污染物的富集情况。为了阐明由于水再循环而导致的无机痕量污染物的富集，进行了部分和全部质量平衡。进行了t-学生分析，以确定滤过水的平均贡献是否影响元素平衡和水流的富集。该t-学生发现第一工厂的Na，Mg，Cl，B，Mn，Se，Cd，Mo和U以及Na，Cl的过滤水对总质量平衡的平均贡献具有统计学意义（p <0.05） ，K，Mg，Hg，Li，B，F，Ni，Zn，Mn，Co Sc，Ge，Se。过滤水中高含量的无机痕量污染物可能会受到石灰石纯度，静电除尘器气体温度，添加剂的使用，氟化物和/或硫酸盐络合物的使用以及洗涤塔中S / F和S / Cl的比率的影响，这可能会降低烟气脱硫中的气态保留效率，并通过从石膏浆料中夹带和/或蒸发液滴（作为颗粒物）来增加金属的排放。

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