Abstract A novel calcium-based sorbent was synthesized from calcium acetate and mesoporous silica through chemical impregnation method. The Brunauer-Emmett-Teller (BET) and scanning electron microscope (SEM) analysis revealed that the sorbent possessed a good surface structure as the calcium salt decomposed to calcium oxide (CaO) through multiple calcination steps. The mercury adsorption performance of the sorbent was investigated in a fixed bed system, the results showed that the sorbent has an obvious penetration behavior for gaseous element mercury (Hg0(g)) while completely adsorbed reactive gaseous mercury (Hg2+(g)) under the pure nitrogen and simulated flue gas atmosphere. On-site sampling test of the calcium-based sorbent traps was ultimately conducted on a 600 MW coal-fired power plant. The Ontario Hydra Method (OHM) was chosen as the reference method to evaluate the accuracy of the sorbent traps sampling results. The measured data obtained by sorbent traps was well consistent with OHM under the selected operational load and all the sorbent traps passed the QA/QC criteria, show that the sorbent traps performed with almost the same accuracy as OHM. The mercury emission and removal characteristics across the existing air pollution control devices (APCDs) were reported based on the sorbent traps sampling results. With the help of SCR for the Hg0 oxidation, ESP for the removal of Hg2+ and Hgp, and the good water solubility of Hg2+ in WFGD, the combination of SCR + ESP + WFGD achieved an excellent mercury removal efficiency with the value of 88.54%. The final mercury emissions from the exhaust were 3.75 μg/m3 and meet the emission requirements of China.

中文翻译：

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使用基于钙基吸附剂捕集器的 EPA 方法 30B 监测燃煤电厂的汞排放

摘要 以醋酸钙和介孔二氧化硅为原料，采用化学浸渍法合成了一种新型钙基吸附剂。Brunauer-Emmett-Teller (BET) 和扫描电子显微镜 (SEM) 分析表明，吸附剂具有良好的表面结构，因为钙盐通过多个煅烧步骤分解为氧化钙 (CaO)。在固定床系统中研究了吸附剂的汞吸附性能，结果表明吸附剂对气态元素汞（Hg0（g））具有明显的渗透行为，而在气态元素汞（Hg2+（g））下完全吸附活性气态汞（Hg2+（g））。纯氮气和模拟烟气气氛。钙基吸附剂捕集器的现场采样测试最终在一座 600 兆瓦的燃煤电厂上进行。选择 Ontario Hydra 方法 (OHM) 作为参考方法来评估吸附剂捕集阱采样结果的准确性。在选定的操作负载下，吸附剂捕集器获得的测量数据与 OHM 非常一致，并且所有吸附剂捕集器都通过了 QA/QC 标准，表明吸附剂捕集器的性能与 OHM 几乎相同。现有空气污染控制装置 (APCD) 的汞排放和去除特性是根据吸附剂捕集器采样结果报告的。借助SCR氧化Hg0，ESP去除Hg2+和Hgp，以及Hg2+在WFGD中良好的水溶性，SCR+ESP+WFGD组合实现了优异的除汞效率，达到88.54%。尾气中的最终汞排放量为 3。