High density and high solids flux CFB risers for steam gasification of solids fuels

• Published in: Fuel processing technology Vol. 91; no. 8; pp. 915 - 920
• Main Authors: Bi, Xiaotao T., Liu, Xinhua
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01-08-2010; Elsevier
• Subjects: Applied sciences; Biomass; Circulating fluidized bed; Coal; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Fuels; Gasification; High density and high flux riser; Natural energy; Syngas production; High density and high flux riser; Circulating fluidized bed; Gasification; Biomass; Syngas production; Coal; Solid fuel; Water vapor; Density; Synthesis gas; Mass balance; Energy balance; Height
• ISSN: 0378-3820; 1873-7188
• DOI: 10.1016/j.fuproc.2009.12.011

The application of high density and high solids flux CFB risers for steam gasification of solids fuels like coal and biomass has been examined in this paper. A simple mass and energy balance analysis revealed that a steam gasification riser needed to be operated at high solids fluxes in order to supply sufficient heat from the standpipe by circulating hot solids to the endothermic gasification reactor. The important design considerations to achieve high solids circulation rate in the CFB unit were discussed in this paper with emphasis given to the riser height, solids inventory, standpipe to riser diameter ratio, and solids feeding control device.