A technique to control mercury from flue gas: The Thief Process |
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| Affiliation: | 1. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping 136000, PR China;2. Key Laboratory of Physics and Technology for Advanced Batteries, Ministry of Education, College of Physics, Jilin University, Changchun 130012, PR China;3. Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;4. University of Tennessee, Knoxville, TN 37930, USA;1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;2. Faculty of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;1. School of Energy Science and Engineering, Central South University, Changsha 410083, China;2. Department of Civil Engineering, The University of Hong Kong, Hong Kong, China;1. Boreskov Institute of Catalysis SB RAS, Novosibirsk 630090, Russian Federation;2. Novosibirsk State University, Novosibirsk 630090, Russian Federation;3. Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090, Russian Federation;4. Novosibirsk State Pedagogical University, Novosibirsk 630126, Russian Federation;1. College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China;2. College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, PR China;3. School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, PR China |
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| Abstract: | The Thief Process is a mercury removal process that may be applicable to a broad range of pulverized coal-fired combustion systems. This is one of several sorbent injection technologies under development by the U.S. Department of Energy for capturing mercury from coal-fired electric utility boilers. A unique feature of the Thief Process involves the production of a thermally activated sorbent in situ at the power plant. The sorbent is obtained by inserting a lance, or thief, into the combustor, in or near the flame, and extracting a mixture of partially combusted coal and gas. The partially combusted coal or sorbent has adsorptive properties suitable for the removal of vapor-phase mercury at flue gas temperatures that are typical downstream of a power plant preheater. One proposed scenario, similar to activated carbon injection (ACI), involves injecting the extracted sorbent into the downstream ductwork between the air preheater and the particulate collection device of the power plant. Initial laboratory-scale and pilot-scale testing, using an eastern bituminous coal, focused on the concept validation. Subsequent pilot-scale testing, using a Powder River Basin (PRB) coal, focused on the process development and optimization. The results of the experimental studies, as well as an independent experimental assessment, are detailed. In addition, the results of a preliminary economic analysis that documents the costs and the potential economic advantages of the Thief Process for mercury control are discussed. |
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