Immersed snake tube heat exchanger
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Immersed snake tube heat exchanger
The immersed coiled tube heat exchanger uses a coiled tube as a heat transfer element, and is one of the types of partitioned heat exchangers. According to the different cooling methods of the fluid outside the tube, the serpentine heat exchanger is divided into immersion type and spray type.
(1) Advantages
This is an ancient heat exchange equipment. It has simple structure, convenient manufacture, installation, cleaning and maintenance, is convenient for corrosion protection, can withstand high pressure, is low in price, and is especially suitable for cooling and condensation of high pressure fluid, so it is still widely used in modern times.
(2) Disadvantages
Because the volume of the container is much larger than that of the pipe, it is bulky and consumes more metal per unit heat transfer area, so the surface heat transfer coefficient of the fluid outside the pipe is smaller. In order to improve the heat transfer coefficient, a stirrer can be installed in the container.
The cold fluid goes inside the tube, the hot fluid goes outside the tube through the baffle, and the cold and hot fluid exchange heat through the partition wall.
It is inconvenient to clean the inside of the tube, the tubes in the middle part of the tube bundle are difficult to replace, and because the bending radius of the innermost tube cannot be too small, and the tube layout in the center of the tube sheet is not compact, the number of tubes cannot be too much, and there is a gap in the center of the tube bundle, so The shell side fluid is easy to short circuit and affect the shell side heat transfer.
In addition, in order to compensate for the thinning of the pipe wall after the bend, a thicker pipe is required for the straight pipe. This affects its use occasions. It is only suitable for situations where the temperature difference between the tube and shell walls is large, or the shell side medium is easy to scale while the tube side medium is clean and not easy to scale, high temperature, high pressure, and strong corrosiveness.
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