【摘要】 本文采用纯氧物理吸收法在立式圆筒形釜中测定了气液容积传质系数K_La,也测量了功率。研究了不同桨型、不同桨间距的双层桨对K_La的影响、结果表明:（1）在H/D=1.8（纯水体系）的釜中,双层桨的K_La明显大于单层桨的K_La、双层桨中,由吸入剪切型平桨A₂和循环悬浮型三叶后掠式斜桨组成的双层桨为最佳;（2）最佳安装位置是:a=360、b=190。此时,其K_La是平均值的1.2倍。得到一K_La与N^*和△h的关联式。（3）功耗与转速成线性关系,双层桨的功耗为最小。所以,双层桨作为聚四氟乙烯生产的搅拌桨是最佳的。更多还原

【Abstract】 In the research, mass transfer coefficients (KLa) of various type of agitators in a vertical cylindrical vessel were measured by pure oxygen absorption method, aad the power consumption were also determined. Influence of type of agitator and spacing of double-staged agitator on KLa was investigated. The results show that:(1) when H/D=1. 8(liquid depth/reactor diameter) , the KLa of double-staged agitator is greater than the KLa of single-staged agitator in the pure water-oxygen system. The double-staged agitator consisted of suction-shearing type A2 and circulation-suspen-sion type B is the optimal agitator. (2) The best mounted place is:a=360(up), b= 190(below). at this position, its KLa is 1. 20 times the size of the average. The relation between KLa and rotating speed(N and N* ) spacing (Δh) is obtained. (3)The relation between power consumption and rotation speedis linear function. The power consumption of double-staged A2 B type agitator is the smallest amongthe experimented agitators.As a result, the agitator A2 B is the best for PTEE production among the investigated agitators.更多还原