Effect of Scale-up on Heat Transfer Characteristics in Upper Splash Region of Circulating Fluidized Bed Risers  

作　　者：R.S. Patil M. Pandey P. Mahanta 

机构地区：[1]Centre for Energy, Indian Institute of Technology, Guwahati 781039, India [2]Department of Mechanical Engineering, Indian Institute of Technology, Guwahati 781039, India

出　　处：《Journal of Energy and Power Engineering》2010年第6期9-15,共7页能源与动力工程（美国大卫英文）

摘　　要：In the present work, steady state heat transfer experiments were conducted in the upper splash region of three cold circulating fluidized beds （CFB）, B 1, B2 and B3, with height of each 2.85 m and bed cross sections of 0.15 m × 0.15 m, 0.20 m × 0.20 m and 0.25 m × 0.25 m, respectively. Experiments were conducted under similar operating conditions on all the three CFt3 setups for two different non-dimensional air velocities （U＊ = 5 and 8） and two different sand inventories with average particles size of 460 μm. Effect of cross section of riser on heat transfer characteristics was studied. Bed temperature distribution across the heater placed in the upper splash region of riser was measured at two sections, at a height of 1.96 m and 2.24 m above the distributor plate. Axial distribution of local heat transfer coefficients along the height of heater were evaluated and compared for different bed cross sections. Results obtained were compared with the available literatures.

关 键 词：Bed temperature CFB heat transfer coefficient scale-up upper splash region. 

分 类 号：TK229.66[动力工程及工程热物理—动力机械及工程] TK124