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首页> 美国卫生研究院文献>other >Utilization of Water Utility Lime Sludge for Flue Gas Desulfurization in Coal-Fired Power Plants: Part II. Lime Sludge Characterization and Mercury Reemission
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Utilization of Water Utility Lime Sludge for Flue Gas Desulfurization in Coal-Fired Power Plants: Part II. Lime Sludge Characterization and Mercury Reemission

机译：石灰厂水污泥在燃煤电厂烟气脱硫中的应用：第二部分。石灰渣的表征和汞排放

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The feasibility of utilizing lime sludge in the flue gas desulfurization process of coal-fired power plants was evaluated through laboratory-scale studies. Eight lime sludge samples, collected from various water treatment plants, and a high-purity limestone sample were extensively characterized and tested for their ability to capture SO2 from a simulated flue gas, while investigating the mercury reemission profiles during the scrubbing process. The reactivity of lime sludge samples for acid neutralization was significantly higher than the reactivity of the tested limestone sample. At doses less than that of the limestone sample, the lime sludge materials reduced the SO2 concentration from 2,000 to <0.5 ppm. The residual lime, higher surface area, and more accessible pores in lime sludge samples were the major factors contributing to their higher reactivity. Concentrations of several elements including B, Mg, Mn, Fe, Cu, Zn, As, Sr, and Ba in some of the tested lime sludge samples were considerably higher than those elements in the limestone. However, no significant leaching of these elements into the scrubber solutions was observed. To investigate mercury reemission during the scrubbing process, ionic mercury was introduced into the simulated slurry and mercury reemission was monitored continuously. Results showed that compared with the limestone sample, the lime sludge samples tested had lower or similar cumulative mercury reemissions. However, different lime sludge samples showed different emission profiles. No conclusive correlation between the composition or trace element content of lime sludge samples and their mercury reemission could be identified. This result was likely due to the oxidative condition of the scrubbing process, which prohibited the reducing species from transforming the ionic mercury into elemental mercury.
机译：通过实验室规模的研究评估了在燃煤电厂烟气脱硫过程中利用石灰污泥的可行性。对八种从各种水处理厂收集的石灰污泥样品和高纯度石灰石样品进行了广泛表征，并测试了它们从模拟烟道气中捕获SO2的能力，同时研究了洗涤过程中的汞释放曲线。石灰污泥样品对酸中和的反应活性明显高于测试石灰石样品的反应活性。在小于石灰石样品剂量的情况下，石灰淤泥材料将SO2浓度从2,000 ppm降低至<0.5 ppm。石灰污泥样品中残留的石灰，较高的表面积和更易于接近的孔隙是造成其较高反应性的主要因素。在一些测试的石灰污泥样品中，包括B，Mg，Mn，Fe，Cu，Zn，As，Sr和Ba在内的几种元素的浓度明显高于石灰石中的那些元素。然而，没有观察到这些元素明显浸出到洗涤器溶液中。为了研究洗涤过程中的汞释放，将离子汞引入模拟浆料中，并连续监测汞释放。结果表明，与石灰石样品相比，所测试的石灰污泥样品的汞释放量更低或相似。但是，不同的石灰污泥样品显示出不同的排放曲线。在石灰污泥样品的组成或微量元素含量与汞的释放之间没有确定的相关性。该结果可能是由于洗涤过程的氧化条件所致，该氧化条件阻止了还原物种将离子汞转化为元素汞。

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