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Show The CEDF is designed for a heat input of 100 MBtuIhr, and integrates combustion and post-combustion testing capabilities to facilitate the development for the next generation of power generation equipment. A wide range of fuels including pulverized coal, fuel oil, and natural gas can be fired. The furnace (Figure 13) is designed for testing a single 100 MBtulhr burner, or multiple wall-fired burner configurations. It has been carefully designed to yield combustion zone temperatures, flow patterns, and residence times representative of commercial boilers. In order to provide maximum flexibility and control, separate fans and air heaters are used for supplying the pulverizer, primary (coal conveying) air, and secondary (windbox) air. The use of an indirect pulverized coal feed system in conjunction with the separate air supplies decouples pulverizer and burner operation, and permits operation over a wide range of coal types, air-to-fuel ratios, fuel moisture contents, and coal particle size distributions. Boiler convection pass and air heater simulators maintain representative conditions through the entire boiler system to facilitate studies of air toxics capture in back-end flue gas clean-up devices. Representative gas phase time-temperature profiles and surface metal temperatures are maintained throughout the convection pass. Convection pass metal temperatures are maintained in the 600-11 OO°F range by way of a novel double-walled tube design. Following the air heater, the flue gas enters a vertical dry scrubber unit to control sulfur dioxide emissions. The resulting dry by-products are then filtered from the gas by a multi-chamber pulse-jet baghouse. Rnw coal FIGURE 13 Prototypical dealgn for ... toxk:a atudy WM acrubber A8hto dlapoul B&W CLEAN ENVIRONMENT DEVELOPMENT FACILITY 17 |