Conducting continuous monitoring and possessing relevant data trf menmry emissions from thermal power plants, is the foundation of setting mercury reduction target and determining process routine. There arc three widely used methods for onsite sampling of gaseous mercury in flue gas: Ontario Hdm Method, continuous analyzer (llg CKMS) and Sorbe.nl Trap (ST) method. The principle, cost, application of these three methods, and the corresponding analysis methods were included, can he a reference for project selection. Hg CEMS offer results in minuies. Hut require significantly higher cost: thus can be used for continuous merrury monitoring. Sorbenl trap systems are simpler to carry and operate, and fit for initial judgment of mercury emission fmm power plants. In addition, the U.S. Mercury emission control situation of thermal power plants was introduced, including mercury control regulations, field installation and operation of flue gas sampling devices, etc.%进行燃煤电厂大气汞排放在线监测,以掌握燃煤电厂大气汞排放的数据,是我国制定汞减排目标和确定工艺路线的基础.目前电厂气态汞的现场采样方法中应用较广泛的有3种:安大略法,连续分析仪和吸附管法.主要讨论了3种烟气采样方法的原理、费用和适用范围,以及相应的分析手段,供工程选择参考.连续分析仪可提供实时监测数据,但价格较高,适用于电厂长期监测:吸附管法便携性强且操作简单,适合对电厂汞排放初步摸底时使用.还介绍了美国对电厂汞排放的控制情况包括汞控制法规及烟气采样设备的安装和使用情况.
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