Control of mercury emissions from coal-fired in electric utility boilers
Control of mercury emissions from coal-fired in electric utility boilers
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DOI：
10.1021/es062639u
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发表时间：
2006-03-01
影响因子：
11.4
通讯作者：
Staudt, J
中科院分区：
文献类型：
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作者：
Srivastava, RK;Hutson, N;Staudt, J
（一）.大气汞是一个全球性问题，有许多自然和人为排放源。美国燃煤发电厂的发电能力超过300 GW，是国内汞排放的主要人为来源（2），尽管它仅占全球年汞排放量的约1%（1）。美国环保署最近颁布了《清洁空气汞规则》（CAMR），以永久限制和减少这些工厂的汞排放（3）。这一规定使美国成为世界上第一个对燃煤电厂汞排放进行监管的国家。CAMR将分两个阶段实施。最初，到2010年将达到38吨的国家年度上限，减少排放量主要是控制其他空气污染物的技术的共同效益。第二阶段设定了到2018年15吨的国家年度上限。第二阶段的削减可能需要使用专门的汞控制技术。实施CAMR的时间框架将为进一步开发和测试这些技术留出更多的时间。EPA最近还颁布了清洁空气州际规则（CAIR），要求进一步减少美国燃煤电厂的NOx和SO2。因此，预计将安装额外的NOx控制和烟气脱硫系统。到2020年，美国一半以上的燃煤发电能力预计将配备选择性催化还原（SCR）和FGD
(1). Atmospheric mercury is a global problem with many natural and anthropogenic emission sources. The US fleet of coal-fired power plants, with generating capacity of> 300 GW, is known to be the major anthropogenic source of domestic mercury emissions (2), although it contributes only~ 1% of worldwide annual mercury emissions (1). The US EPA recently promulgated the Clean Air Mercury Rule (CAMR) to permanently cap and reduce emissions of mercury from these plants (3). This rule makes the US the first country in the world to regulate mercury emissions from coal-fired power plants. CAMR will be implemented in two phases. Initially, a national annual cap of 38 tons (t) is to be reached by 2010, with emission reductions coming primarily as a cobenefit of technologies that control other air pollutants. The second phase sets a national annual cap of 15 t by 2018. The second-phase reductions will likely require use of dedicated mercury-control technologies. The time frame of CAMR implementation will allow added time for further development and testing of these technologies. EPA has also recently promulgated the Clean Air Interstate Rule (CAIR), which requires further reductions of NOx and SO2 from US coal-fired power plants. As a result, additional NOx control and fluegas desulfurization (FGD) systems are expected to be installed. By 2020, more than half of the US coalfired generating capacity is projected to be equipped with selective catalytic reduction (SCR) and FGD