The heat transfer device of the reactor
The reactor is standard chemical equipment and the leading equipment for chemical production to realize chemical reactions. It can be used in all (primarily liquid phase) reactions, liquid-liquid phase reactions, liquid-gas phase reactions, and liquid-solid phase reactions, with many applications.
Since a thermal effect generally accompanies the chemical reaction process, a heat transfer device for heating or cooling needs to be installed outside or inside the kettle body. The heat transfer device can be a jacket or a coil.
To meet heating or cooling needs during the reaction, most reactors are equipped with heat transfer devices.
The choice of heat transfer mode, heat transfer structure, and heat carrier mainly depend on the temperature, reaction heat, heat transfer rate, and process requirements to be controlled. The heat exchange device commonly used in industry is a jacket, as shown in the following picture.
When the heat transfer rate is not high, and the working pressure of the heating medium is lower than 600kPa, a jacketed heat transfer structure is often used. The jacketed heat exchanger is an interlayer wrapped around the reactor, and the heat exchange medium passes through the interlayer.
Jacket form: The jacket is the most commonly used heat transfer structure for stirred reactors. It consists of a cylindrical shell and a head at the bottom of the kettle. The connection between the jacket and the inner cylinder usually has detachable and non-detachable connections.
2. Snake tube
When the heat transfer area required by the process is large, and the heat transfer by the jacket alone cannot meet the requirements, or when the inner wall of the reactor is lined with rubber, ceramic tiles, and other non-metallic materials, a coiled tube, an inserted sleeve, or a D-shaped tube can be used for transfer. Hot.
Snake tube heat exchangers are usually composed of one or more groups of pipes coiled into a loop, directly placed in the reactor, and can be divided into spiral coils and vertical coils.
The characteristics of the heat transfer of the snake tube: the adjustment of the size of the heat transfer area of the snake tube is relatively flexible, and the heat transfer area can be increased or decreased according to needs. The snake tube is immersed in the material. The heat loss is slight, the heat transfer effect is good, and the emotional intensity can be improved, but it isn’t easy to maintain. The jacket and the snake tube can also be combined to increase the heat transfer area. However, the snake tube occupies a specific volume when immersed in the liquid in the kettle, which needs to be considered.