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...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.展开更多
文摘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.
