The paper provides an update on Babcock & Wilcox Power Generation Group, Inc. (B&W PGG) Internal Recirculation-Circulating Fluidized-Bed (IR-CFB) boiler operating experience, new commercial projects, and developments in large-scale supercritical boiler design and process. B&W PGG IR-CFB boilers feature a proven and unique two-stage solids separator. The primary stage is an impact solids separator located at the furnace exit which collects the bulk of the solids and returns them to the furnace. The primary separation stage is arranged as an array of water-cooled, segmented, U-shaped vertical elements (U-beams). The secondary separation stage, typically a multi-cyclone dust collector (MDC), is located in a lower gas temperature region of the boiler. With three-years of successful commercial operation, the latest IR-CFB design is being expanded to higher capacity boilers of 300 MWe. Operating experience of IR-CFB boilers confirms their efficient performance and high reliability and availability. Scale-up to 300 to 600 MWe, with higher steam temperatures, increases these efficiencies and benefits. This allows for a highly competitive utility-scale power plant for central power generation using local coals. Pilot-scale operations are currently underway to finalize the design of an advanced IR-CFB that will utilize in-bed heat exchangers (IBHX). This will allow for use of a greater range of fuels at higher capacities (>300 MWe) and for supercritical once-through designs. Current results of the pilot testing and boiler designs will be discussed, along with applicability to various markets throughout Asia.
展开▼
