Abstract:

A novel gas-sparged quench box with multiple swirling flow structures was designed. With the gas velocity of 10—80 m·s^-1 and liquid velocity of 0.2—0.7 m·s^-1 in a cold-flow model experiment, the liquid volumetric mass transfer coefficient (k_La) was measured using the oxygen absorption method, and the interfacial area (a) was measured using air-Na₂SO₃ solution chemical absorption method. The results showed that mass transfer parameters increased with the increase of gas jet velocity and liquid inlet velocity, especially changing more pronouncedly with fluctuation of gas jet. The k_La and a were better than traditional quench box's performance and were at the same order of magnitude as mechanically stirred device, which illustrated that the multi-swirling quench box is capable of excellent mixing performance. Empirical correlations, obtained through dimensional analysis, fit the experimental data well and could be used to predict the mass transfer characteristics.

Key words: quench box, gas-liquid flow, swirling flow, mass transfer, mixing, interfacial area

摘要：

开发了一种具有多重旋流结构的气体喷射-气液旋流式冷氢箱,并通过大型冷模实验对其进行传质性能测试。在气体喷射速度10～80 m·s^-1和液体进口速度0.2～0.7 m·s^-1条件下,采用氧吸收法测量了液相体积传质系数k_La,采用空气-Na₂SO₃溶液化学吸收法测量了相界接触面积a。结果表明:k_La和a均随气体喷射速度和液体进口速度增大而增大,其中受气体速度变化影响更为明显;由测定的传质参数数值可知新型冷氢箱传质效果较传统冷氢箱大幅提高,与机械输入设备处于相同量级,具有优异的气液混合性能。还采用量纲分析法对数据进行了归纳拟合,得到传质参数与气相Reynolds数、液相Weber数之间的关联式,可以较好地关联预测冷氢箱的传质性能。

关键词: 冷氢箱, 气液两相流, 旋流, 传质, 混合, 相界面积