Heat-Transfer Characteristics in Slurry Bubble Columns at Elevated Pressures and Temperatures
Heat-Transfer Characteristics in Slurry Bubble Columns at Elevated Pressures and Temperatures
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DOI：
10.1021/ie990774s
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发表时间：
2000-05
影响因子：
4.2
通讯作者：
G. Q. Yang;X. Luo;R. Lau;L. Fan
中科院分区：
文献类型：
--
作者：
G. Q. Yang;X. Luo;R. Lau;L. Fan
通过实验和分析研究了浆态鼓泡塔中浸入式加热表面与周围气液固介质之间的传热行为。工作压力和温度分别高达 4.2 MPa 和 81 °C。氮气、Paratherm NF 传热流体和 53 μm 玻璃珠分别用作气相、液相和固相。固体浓度变化最大为 35 vol%，而表观气体速度变化最大为 20 cm/s。研究了气体速度、固体浓度、压力和温度对传热系数的影响。研究发现压力对传热特性有显着影响。浆态泡罩塔中的传热系数随着压力的增加而明显降低。值得注意的是，传热系数随压力的变化归因于液体粘度增加、气泡尺寸减小和气体 h 增加的抵消作用。
The heat-transfer behavior between an immersed heating surface and the surrounding gas−liquid−solid medium in a slurry bubble column is studied experimentally and analytically. The operating pressures and temperatures vary up to 4.2 MPa and 81 °C, respectively. Nitrogen, Paratherm NF heat-transfer fluid, and 53-μm glass beads are used as the gas, liquid, and solid phases, respectively. The solids concentrations are varied up to 35 vol %, while the superficial gas velocities are varied up to 20 cm/s. The effects of gas velocity, solids concentration, pressure, and temperature on the heat-transfer coefficient are examined. It is found that pressure has a significant effect on heat-transfer characteristics. The heat-transfer coefficient in a slurry bubble column decreases appreciably with an increase in pressure. It is noted that the variation in the heat-transfer coefficient with pressure is attributed to the counteracting effects of the increased liquid viscosity, decreased bubble size, and increased gas h...