采用间接膨胀法研究鼓泡床内气含率特性

引言 鼓泡床反应器凭借其相际接触面大、传递效率高、结构简单和操作稳定等优势而成为气液两相进行质量、动量和能量传递及化学反应的重要设备,在化工及相关领域应用广泛1-2].尽管前人采用不同测量方法对鼓泡床内气含率特性进行了大量的实验研究,并推导出了相应的经验关联式3-5],但这些实验大多是针对室温和常压的透明鼓泡床,难以直接应用于非透明的高温或高压实际工业过程中.

Gas holdup measurement of bubble column using indirect expansion technique

An indirect expansion technique was proposed to measure the gas holdup in a non-transparent bubble column with 0.1 m inner diameter and height of 5.2 m.Air and distilled water were employed as gas and liquid phases, respectively.The experimental results show that the average and maximum errors of gas holdup are less than 2% and 4.5%, respectively, between the indirect expansion and pressure drop methods at atmospheric or elevated pressure.Moreover, the gas holdup increases with operating pressure when the superficial gas velocity is a constant, while the effect of static liquid height on gas holdup can be ignored when the operating pressure and superficial gas velocity are fixed.