| This paper mainly studies the distribution of gas-liquid two-phase in the bubbling container. Firstly, centers in the bubbling container with the distributor, Secondly, by altering the vent position、number、velocity and the Gas-liquid contact form(countercurrent or concurrent),Meanwhile, at the lower end of the container, by adding the vertical spray nozzle in different diameters to study.Finally, by comparison with the different structure results, it indicated as follow:When selecting from the lower ventilation, in order to avoid the dead angle, we’d better use "U" type、"V "type"、elliptic and circular type(radius of curvature is not too large, and the2times of it should not exceed the tower diameter)";By adding the lateral inlet to improve the distribution of gas-liquid two-phase, for the large diameter of the container, the feasibility of this approach is not very ideal, but it is suitable for the smaller; When the lower end of the gas inlet’s direction changed to be vertical:nozzle diameter should not be smaller than the container’s, it’s better be correspond, when it has a nozzle, the gas-liquid two-phase’s distribution is very uniform, especially for the whole container; but there are also shortcomings, compared to other forms of energy, the loss is serious, but for the bubbling device the low speed also can achieve good results, and this structure is ideal and gain popularity for the biological fermentation and technique requirements which requires no violent turbulence.Through the simulation calculation of structure optimization in container, gas velocity and liquid velocity roughly distributed from the center to the wall, along the radial direction as a parabola, the symmetry axis roughly in the1/2container. By using the mathematics software MATLAB, the ventilation velocity uG and the gas holdup εG in the container for linear regression, it shows: εG=x*uGy note:x∈(1.285,2.4598),y∈(0.5750,0.8210)... |
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