In 2010 CPS Energy started up Spruce Unit 2, the fourth coal-fired unit at the Calaveras Lake Power Plant. Spruce 2 is an 800-MW pulverized coal unit equipped with SCR, a reverse-gas fabric filter, and a limestone forced oxidation wet FGD. When the unit was permitted, it was expected that co-benefit mercury (Hg) capture would achieve the permit limit, which is based on a 12-month rolling average. However, after startup the stack Hg CEMS indicated that emissions might exceed the limit over the first 12 months. CPS Energy began a project to determine what limitedHg capture, test alternatives to improve Hg capture, and implement a solution. This paper presents the findings of this project, including existing limitations on Hg capture, the performance of two add-on technologies (activated carbon injection and KNX), and plans to implement the selected solution. Both brominated activated carbon and KNX proved very effective for this plant configuration.
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机译：2010年，CPS能量启动云杉单元2，Calaveras Lake Power Plant的第四个燃煤单位。 Spruce 2是一个配备有SCR，反向气体织物过滤器和石灰石强制氧化湿FGD的800 MW粉煤机。当允许该单位时，预计会有共效汞（HG）捕获将达到许可限额，该限额基于12个月的轧制平均值。但是，在启动后，堆栈HG CEM表明排放可能超过前12个月的限制。 CPS Energy开始项目以确定有什么限制的捕获，测试替代方案以改善HG捕获，并实施解决方案。本文介绍了该项目的调查结果，包括对HG捕获的现有限制，两个附加技术的性能（激活的碳注入和KNX），并计划实施所选解决方案。溴化活性炭和KNX都证明了这种植物配置非常有效。
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