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首页> 外文会议>Air Waste Management Association's annual conference exhibition >Predicting the Impact of Wet FGD Scrubbing on Hg Emissions from Coal-Fired Power Stations
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Predicting the Impact of Wet FGD Scrubbing on Hg Emissions from Coal-Fired Power Stations

机译：预测湿法FGD擦洗对燃煤发电站HG排放的影响

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This paper introduces a predictive capability for Hg retention in any Ca-based wet FGD, given Hg speciation at the FGD inlet, the flue gas composition, and the SO2 capture efficiency. An analysis of data from 17 full-scale wet FGDs based on thermochemical equilibrium yields highly accurate predictions for total Hg retention with no parameter adjustments. For the most reliable data, the predictions were within measurement uncertainties for both limestone and Mg/lime systems operating in both forced and natural oxidation mode. With the ICR database, the quantitative performance was almost as good for the most modern FGDs, which probably conform to the very high SO2 absorption efficiencies assumed in the calculations. The large discrepancies for older FGDs are tentatively attributed to the unspecified SO2 capture efficiencies and operating temperatures and to the possible elimination of HCl in prescrubbers. The predicted Hg retention is most sensitive to inlet HCl and O2 levels and the FGD temperature; weakly dependent on SO2 capture efficiency; and insensitive to HgCl2, NO, Ca/S ratio, and slurry dilution level in limestone FGDs, and to MgSO3 levels in Mg/lime systems. Consequently, FGDs will retain less Hg from flue gases derived from subbituminous coals than from typical hv bituminous coals, even when the levels of oxidized Hg at the FGD inlet are the same. Also, systems with prescrubbers to eliminate HCl probably retain less Hg than fully integrated FGDs. The analysis also predicts re-emission of Hg0, but only for inlet O2 levels that are much lower than those in full-scale FGDs.
机译：本文介绍了在FGD入口，烟道气组合物和SO2捕获效率下给予任何CA基湿法FGD的HG湿FGD的预测能力。基于热化学均衡的17个全型湿法FGDS的数据分析，可以高度准确的预测，对于总HG保留，没有参数调整。对于最可靠的数据，预测是在强制和天然氧化模式下操作的石灰石和MG /石灰系统的测量不确定性。通过ICR数据库，定量性能几乎与最现代的FGDS一样好，这可能符合计算中假设的非常高的SO2吸收效率。较旧的FGDS的巨大差异暂时归因于未指定的SO2捕获效率和工作温度以及可能的消除PCL中的HCL。预测的汞潴留对入口HCl和O2水平和FGD温度最敏感;弱依赖于SO2捕获效率;对石灰石FGDS的HGCl2，NO，Ca / S比和浆料稀释水平的不敏感，并对Mg /石灰系统中的MgSO 3水平进行不敏感。因此，即使FGD入口处的氧化Hg水平相同，FGDS将从衍生自亚烟煤中衍生的烟气的烟道气体保持较少的Hg。此外，具有消除HCL的具有预校长的系统可能保留比完全集成的FGDS更少的HG。该分析还预测HG0的重新发射，但仅适用于远低于全规模FGDS的I2水平。

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