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    Home > Active Ingredient News > Drugs Articles > Common classification of tubular heat exchanger

    Common classification of tubular heat exchanger

    • Last Update: 2019-01-07
    • Source: Internet
    • Author: User
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    The common classification of tube heat exchanger is as follows: fixed tube plate fixed tube plate heat exchanger is to weld tube plates at both ends directly with the shell It is mainly composed of shell, tube sheet, tube bundle, head and other major components A tube bundle is arranged in the shell The two ends of the tube bundle are welded, expanded or expanded welded and some methods are used to fix the tube on the tube plate The outer circumference of the tube plate and the head flange are fastened with bolts The fixed tubesheet heat exchanger has the advantages of simple structure, low cost, easy manufacture, convenient tube cleaning and maintenance, but it is difficult to clean the shell side, and the temperature difference stress exists after the tube bundle is manufactured When there is a large temperature difference between the heat exchange tube and the shell, the shell shall also be provided with an expansion joint The tube plate at one end of the floating head heat exchanger is fixed between the shell and the tube box, and the tube plate at the other end can move freely in the shell body, that is to say, the thermal expansion of the shell and the tube bundle can be free Therefore, there is no temperature difference stress between the tube bundle and the shell Generally, the floating head is detachable, and the tube bundle can be pulled out and installed freely This structure of floating head heat exchanger can be used in the case of large temperature difference between tube bundle and shell The cleaning and maintenance of tube bundle and shell are more convenient, but its structure is relatively complex, and the requirements for sealing are also relatively high The U-tube U-tube heat exchanger is a U-shaped heat exchange tube with both ends fixed on the same tube plate Because the shell and the heat exchange tube are separated, the heat exchange tube bundle can expand freely, and the temperature difference stress will not be generated due to the temperature difference of the medium The U-tube heat exchanger has only one tube plate, no floating head and simple structure The tube bundle can be extracted and installed freely, which is convenient for cleaning It has the advantages of floating head heat exchanger However, because the heat exchange tube is made into U-bend with different radius, the outer heat exchange tube can be replaced when it is damaged, and other damaged tubes can only be blocked At the same time, compared with the fixed tubesheet heat exchanger, due to the restriction of the bending radius of the heat exchanger tube, there is a gap in the center of the tube bundle, so the fluid is easy to go short circuit, which affects the heat transfer effect.
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