Modeling Mercury Capture within ESPs: Continuing Development and Validation
Efforts to reduce anthropogenic mercury emissions worldwide have recently focused on a variety of sources, including mercury emitted during coal combustion. Toward that end, much research has been ongoing seeking to develop new processes for reducing coal combustion mercury emissions. Among air pollution control processes that can be applied to coal-fired boilers,electrostatic precipitators (ESPs) are by far the most common, both on a global scale and among the principle countries of India,China, and the USA that burn coal for electric power generation. A previously reported theoretical model of in-flight mercury capture within ESPs is herein validated against data from a number of full-scale tests of activated carbon injection for mercury emissions control, resulting in the first validated model of mercury capture within ESPs. By using the established particle size distribution of the activated carbon and actual or estimated values of its equilibrium mercury adsorption capacity, the incremental reduction in mercury concentration across each ESP can be predicted and compared to experimental results. Because the model does not incorporate kinetics associated with gas-phase mercury transformation or surface adsorption, the model predictions represent the mass-transfer-limited performance. Comparing field data to model results reveals many facilities performing at or near the predicted mass-transfer-limited maximum, particularly at low rates of sorbent injection. Where agreement is poor between field data and model predictions, additional chemical or physical phenomena may be responsible for reducing mercury removal efficiencies.
mercury capture ESP model prediction sorbent injection
Herek L.Clack
Department of Mechanical,Materials and Aerospace Engineering,Illinois Institute of Technology 10 West 32nd Street,Chicago,Illinois 60616,USA
国际会议
11th International Conference on Electrostatic Precipitation(第11届国际电除尘学术会议)
杭州
英文
37-44
2008-10-15（万方平台首次上网日期，不代表论文的发表时间）