The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
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May 13-17, 2007
This paper gives a brief overview of the status and prospects for fluidized bed combustion (FBC) for clean energy, with focus on power and heat generation. The paper summarizes recent development trends for the FB technology and makes an outlook into the future with respect to challenges and opportunities for the technology. The paper also identifies areas related to fluidization, which are critical for the technology and, thus, will require research. The main advantage with the FBC technology is the fuel flexibility. A compilation of 715 FB boilers (bubbling and circulating) worldwide illustrates the two main applications for the FBC technology: 1. Small and medium scale heat only or combined heat and power boilers (typically of the order of or less than 100 MW thermal), burning biomass or waste derived fuels, including co-firing with coal and 2. larger (up to 1,000 MWth) power boilers using coal (black coal or lignite) as fuel. Emerging development includes circulating fluidized beds with supercritical steam data (power boilers) with the first project coming on-line in the near future and research on oxy-fuel fired circulating fluidized beds for CO2 capture (O2/CO2 recycle schemes as well as chemical looping combustion). Research needs on the topic of fluidization are mainly related to mixing of fuel, solids and gas, including penetration and mixing of secondary air. The larger the cross section of the furnace, the more critical is the fuel mixing, i.e. this is critical for large power boilers. For small and medium scale FBC boilers burning waste and waste derived fuels, there is also a need to understand fuel and gas mixing in order to be able to lower the excess air ratio and, thus, to increase the efficiency.
Filip Johnsson, "Fluidized Bed Combustion for Clean Energy" in "The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering", Franco Berruti, The University of Western Ontario, London, Canada; Xiaotao (Tony) Bi, The University of British Columbia, Vancouver, Canada; Todd Pugsley, University of Saskatchewan, Saskatoon, Saskatchewan, Canada Eds, ECI Symposium Series, (2007). https://dc.engconfintl.org/fluidization_xii/5