In an ultra-clean power plant, the mercury and other trace metal contaminants in coal must be removed from the exhaust gas to near zero levels. To achieve near zero levels, these pollutants are currently cleaned from gasification processes at cool temperatures. A process that removes them in one integrated process, at higher temperatures, would increase the efficiency of the cleanup process, and therefore reduce the cost of electricity in an ultra-clean gasification-based power plant. The objectives of this project are to develop a coal syngas cleanup system effective in removing Hg, As, Se and Cd at temperatures between 300° to 700°F, under typical gasification conditions, in a single, integrated sorbent device, called a monolith. The cleanup system will be developed to reach the following maximum contaminant levels after cleanup: 5 ppbw Hg, 5 ppb As, 0.2 ppm Se, and 30 ppb Cd. Corning, Inc. will produce the monoliths at their facility in Corning, New York; the monoliths will be tested at the University of North Dakota Energy and Environmental Research Center test facility.
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