【摘要】 由空气水玻璃珠（ρ＝２６３０ｋｇ／ｍ３，ｄｐ＝２５μｍ）构成三相体系，在内置机械搅拌桨的内循环反应器中进行实验。实验条件：表观气速Ｕｇ０．５～１９．０ｃｍ／ｓ，固含量εｓ１％、２％、４％（质量分数），搅拌桨速度为０～１２００ｒ／ｍｉｎ。结果表明总体积传质系数ＫＬａ随气体表观气速和搅拌速度增加而增加。总能量耗散速率同时受通气能量耗散速率与搅拌机械能量耗散速率的影响。搅拌转速一定时，搅拌机械能量耗散速率随表观气速的增加而下降。从能量角度考虑，表观气速和搅拌速度的选择应有一个良好的匹配。存在固体颗粒时，传质系数ＫＬａ与传质界面面积ａ均得到改进。对于２５μｍ玻璃珠体系，ＫＬａ值随固含率变化，其最大值的产生在２％固含率左右，固含率继续增加，则ＫＬａ降低。最后对ＫＬａ固含率及能量耗散速率作了关联。更多还原

【Abstract】 Experiments are performed in an internal loop airlift reactor equipped with a mechanical stirrer.The height of column is 1.5 m and its diameter is 0.15 m.The diameter of the riser is 0.1 m.The three phase system used is constituted of air,water and glass beads.Superficial gas velocity varies from 0.5 to 19.0 cm/s,solid loading from 1% to 4%,and impeller rotation speeds are 0～1 200 r/min .For glass beads of 25 μm ( ρ =2 630 kg/m 3),the volume mass transfer coefficient K La increases with solid loading and the maximum increase occurs at approximately 2%. K La decreases with further solid additions.The total energy dissipation rate ( P T) for combined aeration and stirrer operation is assumed to be sum of the individual contributions from aeration ( P A ) and stirrer operation ( P P ).At the same superficial gas velocity, P P must be matched with P A for getting a high K L a value and saving energy.A correlation equation for K L a is proposed.更多还原