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Application of shell and tube heat exchanger and selection of heat exchange tubes
- May 16, 2018 -

So far, shell-and-tube heat exchangers have a wide range of application characteristics in the market. In general, the basic structure of the shell and tube heat exchanger is usually a small number of heat exchange tubes in the circular shell, when the heating of the heating medium is steam, the shell tube steam and water heat exchanger; If the heated heat medium is high-temperature water, it is called shell-tube water-water heat exchanger.


In the latter shell-and-tube heat exchanger, taking into account the influence of the working medium water, and the speed of the water flow on both sides of the small tube, the diameter of the circular shell can not be too large, so when the heating area requirements are large, often Segments are connected, so it can also be called a segmented water-water heat exchanger. Such heat exchangers are commonly used in hot water heating systems, low temperature water air conditioning systems and certain continuous hot water production process waters. As a domestic hot water supply, a storage tank is required.


Regardless of the form of the shell-and-tube heat exchanger, the heat exchange tubes belong to a very important component in its structural composition. Moreover, the selection of heat exchange tubes often directly affects the final effect of heat transfer. At present, the commonly used heat exchange tubes are light tubes, threaded tubes, spiral groove tubes, and the like. So, what factors should be considered when selecting heat exchange tubes?


First of all, in order to ensure the working effect of the shell-and-tube heat exchanger, the diameter of the heat exchange tube must be reasonably selected. In general, the smaller the diameter of the heat exchanger is, the more compact and cheaper it is, and the better the ratio of convective heat transfer coefficient and drag coefficient can be obtained. However, the smaller the diameter of the heat exchanger is, the larger the pressure drop will be. When the pressure drop is allowed, 19 tubes are generally recommended. For fouling-prone fluids, an outer diameter of 25 tubes was used for cleaning.


In addition, it is necessary to reasonably determine the length of the heat exchange tubes, their arrangement, and the tube center distance in accordance with the specific application requirements. For the shell-and-tube heat exchanger, the arrangement of the heat exchange tubes on the tube plate mainly includes two forms of square arrangement and triangular arrangement. The tube spacing is the distance between the centers of two adjacent tubes.http://www.syhgzben.com/