The structure of the kettle body is usually vertical cylindrical, and its height-diameter ratio is mainly determined by the operation of the container liquid-filling height-diameter ratio and the size of the charging factor. The height-diameter ratio of the container depends on the nature of the material in the container, the stirring characteristics and the number of stirrer layers, generally 1~1.3, and the maximum can reach 6. The shape of the bottom of the kettle is flat-bottomed, oval-bottomed, conical bottom, etc., and sometimes square kettle can also be used. At the same time, according to the heat transfer requirements of the process, a jacket can be added to the outside of the kettle, and the heat-carrying medium such as steam and cooling water can be passed; When the heat transfer area is insufficient, a coil can be installed inside the kettle.
When selecting the mixing vessel, the shape and size of the mixing vessel should be determined according to the production scale (i.e., material handling capacity), the purpose of the mixing operation and the characteristics of the material, and the charging coefficient should be reasonably selected when determining the volume of the mixing vessel, so as to maximize the utilization rate of the equipment. If there is no special need, the most commonly used vertical cylindrical container should be selected for the kettle, and the appropriate height-diameter ratio of the cylinder (or the height-diameter ratio of the container liquid) should be selected. If there is a requirement for heat transfer, a jacket structure must be set outside the kettle. The types of jackets include integral jackets, spiral baffle jackets, half-pipe jackets, and honeycomb jackets, and the heat transfer effect is improved sequentially, but the manufacturing cost is also increased accordingly.