The special feature of the box reactor is that the stirrer is configured with a frame structure, so that the stirrer in the form of different impellers can meet different stirring requirements. The stirrer in a box reactor is usually constructed by mounting 2 to 4 flat or curved blades on a horizontal disc. The ratio of the outer diameter, width and height of the blade is approximately 20:5:4, and the circumferential speed is generally 3 to 8 m/s.
In the selection of the frame reactor, it is considered that a highly turbulent radial flow will be generated during the rotation of the turbine, which is suitable for the dispersion and liquid-liquid reaction processes of gases and immiscible liquids. At the same time, according to the physical properties of the medium, capacity, the purpose of the mixing operation and other factors, determine the appropriate impeller form, size, speed and other parameters, so that the stirrer to maximize the use of mixing operations to meet the needs.
Under normal circumstances, the diameter of the stirrer in the frame reactor is relatively large, which can account for about 2/3 to 9/10 of the internal diameter of the kettle, its rotational speed range is 50 to 70 r/min, and the line speed is about 0.5 to 1.5 m/s. . The gap between the agitator and the kettle wall in the frame reactor is small, which is conducive to the heat transfer process.
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