Heat transfer in standpipe of circulating fluidised bed boiler

Wall-to-Suspension Heat Transfer in a CFB Downcomer

“…HTC is closely related to the hydrodynamics, with bed suspension density being the most influential factor Tamarin and Gorbachev, 1968 [36] Heat transfer coefficient between a bed of moving slag particles and a vertical surface was experimentally determined in several gas atmospheres Kim et al, 1999 [37] Bed-to-wall heat transfer coefficient was determined in a downcomer reactor and results showed suspension density, gas convection, and particle size as influential factors. A model was proposed to predict the bed-to-wall HTC Lehner and Wirth, 1999 [38] The effect on the local and overall solids circulation in a downcomer was studied for various gas/solids distributors Obuskovic, 1988 [39] HTC was measured for a single vertical tube immersed in a moving packed bed of glass beads, sand, or copper in air at atmospheric pressure in order to obtain a general predictive equation Peters and Dziugys, 2012 [40] Heat transfer prediction in a fixed and moving packed bed by extended discrete element method Basu et al, 2013 [41] Investigation of heat transfer to cross and vertical tubes in a standpipe of a circulating fluidized bed boiler. A model provides a fair agreement with experimental results…”