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Mercury Capture Within Coal-fired Power Plant Electrostatic Precipitators: Model Evaluation

机译：燃煤电厂静电除尘器中汞的捕集：模型评估

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摘要

Efforts to reduce anthropogenic mercury emissions worldwide have recently focused on a variety of sources, including mercury emitted during coal combustion. Toward that end, much research has been ongoing seeking to develop new processes for reducing coal combustion mercury emissions. Among air pollution control processes that can be applied to coal-fired boilers, electrostatic precipitators (ESPs) are by far the most common, both on a global scale and among the principal countries of India, China, and the U.S. that burn coal for electric power generation. A previously reported theoretical model of in-flight mercury capture within ESPs is herein evaluated against data from a number of full-scale tests of activated carbon injection for mercury emissions control. By using the established particle size distribution of the activated carbon and actual or estimated values of its equilibrium mercury adsorption capacity, the incremental reduction in mercury concentration across each ESP can be predicted and compared to experimental results. Because the model does not incorporate kinetics associated with gas-phase mercury transformation or surface adsorption, the model predictions represent the mass-transfer-limited performance. Comparing field data to model results reveals many facilities performing at or near the predicted mass-transfer-limited maximum, particularly at low rates of sorbent injection. Where agreement is poor between field data and model predictions, additional chemical or physical phenomena may be responsible for reducing mercury removal efficiencies.
机译：减少全球人为汞排放的努力最近集中在各种来源，包括煤燃烧过程中排放的汞。为此，正在进行大量研究以寻求开发减少煤燃烧汞排放的新方法。在可用于燃煤锅炉的空气污染控制过程中，静电除尘器（ESP）迄今为止最为普遍，无论是在全球范围内，还是在印度，中国和美国等主要燃煤发电的国家中发电。本文根据许多用于控制汞排放的活性炭注入的大规模测试数据，评估了先前报道的ESP中机上汞捕获的理论模型。通过使用已建立的活性炭粒径分布及其平衡汞吸附能力的实际或估计值，可以预测每个ESP中汞浓度的增量降低，并将其与实验结果进行比较。由于该模型未包含与气相汞转化或表面吸附相关的动力学，因此模型预测代表了传质受限的性能。将现场数据与模型结果进行比较，可以发现许多设施在达到或接近预期的传质限制最大值的情况下运行，特别是在低吸附剂注入速率下。如果现场数据与模型预测之间的一致性差，则可能会有其他化学或物理现象导致汞去除效率降低。

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  • 来源
    《Environmental Science & Technology》 |2009年第5期|1460-1466|共7页
  • 作者

    HEREK L. CLACK;

  • 作者单位

    Department of Mechanical, Materials and AerospacernEngineering Illinois Institute of Technologyrn10 West 32nd Street Chicago, Illinois 60616;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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