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Show achieved with a two-stage cooling process utilizing two heat recovery components: one simulating the convection bank, and the second simulating an air heater. In the convection bank, representative tube metal temperatures of 600 - 1100 F are achieved with a double-walled tube design separated with an air gap. Realistic ash deposition and fouling behavior can be studied in this manner. Cavities are provided in the convection pass tube banks to allow for future addition of SCR and SNCR systems for NO control, and lime/lime- x stone injection for S02 con-trol. The flue gas is cooled by a secondary air heater and supplementary flue gas cooler (cooling air exhausted to the atmosphere) to approximately 350 F. Flue gas recirculation (FGR) is incorporated into the ALLIANCE, 01.110 BABCOCK & WILCOX CEDF design for assessing its effects on NO abatement, and x simulating turbine exhaust gas for assessing combined cycles. Flue gas can be recirculated to the burner(s) from either the hot and/or cold side of the secondary air heater/flue gas cooler at rates up to 35%. The FGR temperature is controlled by mixing of the cooled and uncooled gases. The CEDF incorporates several back-end flue gas cleanup technologies for both satisfying EPA emissions limits for the facility, and as a test unit for research and development. These include a dry scrubber, baghouse, electrostatic precipitator, and slipstream wet scrubber. Flue gas finally exits the system through a 200-foot stack which is necessary for the facility to meet all pertinent local, state, and federal environmental air emissions regulations. The CEDF will serve B&W's customers in the following areas. It will facilitate development of new products to further reduce emissions from the combustion process. It will also be utilized to evaluate product developments which address new and unfamiliar fuels. It will also permit assessment of alterations to current products to facilitate their use in retrofitting existing units. Finally, additional process improvements in current post -combustion technologies will be developed. With a design that represents the combustion and emissions processes of a modern power plant, the clean environment development facility provides B&W with a unique capability for research, development, and demonstration of combustion and emission control systems at a scale of appropriate size. WASHINGTON, D.C. RESEARCH AND DEvaoPMENT I CONTRACT RESEARCH DIVISIONS 1562 BEESON SlREET L YNCIIBURG, VIRGINIA BABCOCK & WILCOX CONlRACT RESEARCH DIVISION 2220 LANGHORNE ROAD LYNCHBURO. VIRGINIA 24506-1435 (804) 9484712 BABCOCK & WILCOX CONlRACT RESEARCH DIVISION 1525 WILSON BOULEVARD, SUITE 100 ARLINGTON, VIRGINIA 22209-2411 (703) 528-6237 ALuANCE. OHIO 44601-2196 (216) 821-9110 a McDermott company The data herein are solely for your information and not offered, or to be construed, as a warranty or contractual responsibih •• © 1994 The Babcock & Wilcox Company All rights reserved. |
