Research On Enlarge Method For Four Types Of Agitator

Scaling-up and research of newly-developed agitators is an important topic in industrial application. Research has been done on four types of agitators, two of which are newly-developed ones under similar geometry condition. In addition, numerical simulation is carried out on two kinds of agitators.Experiments are carried out separately in two stirred tanks with 300mm and 575mm in diameter respectively. Four types of agitators are studied in each tank in two kinds of medium with different viscosity. They are also investigated on power-consumption and mixing characteristics represented by power-criteria number and mixing-time number. The experiment data shows that the relationship of power-criteria number size of different agitators is the same in different tanks in the same medium, The large-double-blade impeller has the least mixing time and minimum mixing time number in every tank with different medium. The scaling-up rules for four types of agitators are different taken mixing efficiency number as criterion. The same speed of impeller tip rule is used for double-oblique 45-degree impeller and two-layer of double-oblique 45-degree impeller. Same unit-volume power-consumption is used for frame impeller. The froude number is used for large-double-blade impeller.The inside field of stirred tank with 300mm diameter with double-oblique 45-degree impeller and large-double-blade impeller was imitated with FLUENT software. The simulation results are in conformity with the results of experiment research. Simulation is also carried on real industrial process with double-oblique 45-degree impeller. The flow field and velocity field are compared with actual situations. The results are in conformity with each other.