Snake tube heat exchanger
The material of the heat transfer element of the coiled tube heat exchanger is divided into two categories: metal and non-metal. In recent years, the coiled-tube metal heat exchanger has developed rapidly in the world and has become the main form of heat exchange device. Non-metallic coiled-tube heat exchangers have high cleanliness heat exchange materials, and their corrosion resistance is crowned by various alloys, such as the research on the non-metallic coiled tube polytetrafluoroethylene heat exchange manufacturing technology at the university has promoted the coiled tube heat exchanger to gradually be widely used in petrochemical, sulfuric acid, medicine, electroplating, light industry and other fields.
1.Immersed coiled tube heat exchanger
Structure: This type of heat exchanger is mostly wound with metal tubes, or made into a variety of conditions suitable for the container, and immersed in the liquid in the container.
The immersed coil heat exchanger uses a coiled tube as a heat transfer element, which is one of the types of partition wall heat exchangers. This is an ancient heat exchange equipment. It has a simple structure, convenient manufacture, installation, cleaning and maintenance, low cost, and is especially suitable for cooling and condensing high-pressure fluids, so it is still widely used in modern times. However, the coiled tube heat exchanger is large and heavy; the metal consumption per unit heat transfer area is high, and the heat transfer efficiency is low.
The structure is simple, easy to be anticorrosive, and can withstand high pressure.
Because the volume of the container is much larger than the volume of the tube, the surface heat transfer coefficient of the fluid outside the tube is small. To increase the heat transfer coefficient, a stirrer can be installed in the container.
2.Spray heat exchanger
Structure: The cooling water drips from the spraying device of the uppermost tube, flows down along the surface of the tube, the cooled fluid flows in from the uppermost tube, flows out from the lowermost tube, and exchanges heat with the cooling water outside. During downflow, cooling water can be collected and redistributed.
Advantages: simple structure, low cost, high pressure resistance, easy maintenance, cleaning, and good heat transfer effect.
Disadvantages: The cooling water spray is not easy to be uniform and affects the heat transfer effect. It can only be installed outdoors.
Application: For cooling or condensing liquid in pipes.
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