Wide-viscosity-range impellers have extensive demands and applications in process industry. The gas–liquid dispersion and mass transfer characteristics of wide-viscosity-range impellers including Large-double-blade (LDB) impeller, Fullzone (FZ) impeller and Maxblend (MB) impeller in water solutions of xanthan gum were investigated experimentally and compared. The influences of gas flow rate, impeller speed and polymer concentration of liquid on the power consumption, overall gas holdup ε_g and mass transfer coefficient K_La were also analyzed. On this basis, the appropriate operating parameters and impeller type were determined. The results indicate that with rising flow rate, the higher ε_g and K_La can be achieved with a drop in power consumption, and a relatively high flow rate is recommended on the premise of guaranteeing the complete dispersal condition in aerated vessel. Higher impeller speed provides better gas–liquid dispersion and mass transfer performance, but results in more power consumption simultaneously. The appropriate impeller speed should be just enough to meet the requirements of ε_g and K_La. It also is found that the increasing concentration of water solution of xanthan gum adds to the complexity of gas dispersion and mass transfer in aerated vessel. Under the same specific power consumption P_V, the ε_g and K_La are positive and negative correlation with the polymer concentration of liquid, respectively. Specially, when the concentration of water solution of xanthan gum is relatively low, the FZ impeller exhibits the best gas dispersion and mass transfer performance under the same specific power consumption. Nevertheless, the mass transfer performance of FZ impeller deteriorates significant when the concentration of water solution of xanthan gum increases to 1.00 wt%, and the MB impeller becomes the most appropriate impeller type in this condition.

宽粘度范围的叶轮在加工工业中有着广泛的需求和应用。实验研究了黄原胶水溶液中宽粘度范围的叶轮（包括大型双叶片（LDB）叶轮，Fullzone（FZ）叶轮和Maxblend（MB）叶轮）的气液分散性和传质特性。气体流量，叶轮速度和液体的功耗聚合物浓度，影响总体气体滞留量ε_克和传质系数ķ_大号一个进行了分析。在此基础上，确定了合适的运行参数和叶轮类型。结果表明，与上升流率，较高的ε_克和ķ可以通过降低功耗来实现_L a，并且在保证充气容器中完全分散的前提下，建议使用较高的流速。较高的叶轮速度可提供更好的气液分散和传质性能，但同时会导致更多的功率消耗。适当的叶轮速度应该足以满足的要求ε_克和ķ_大号一个。还发现黄原胶的水溶液浓度的增加增加了充气容器中气体分散和传质的复杂性。在相同的特定的功率消耗P _V，则ε_克和K _L a与液体的聚合物浓度分别为正相关和负相关。特别地，当黄原胶的水溶液浓度相对较低时，FZ叶轮在相同的比功率消耗下表现出最佳的气体扩散和传质性能。然而，当黄原胶的水溶液的浓度增加到1.00重量％时，FZ叶轮的传质性能显着下降，并且MB叶轮在该条件下成为最合适的叶轮类型。