Performance characteristics of tubular heat exchanger:
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Performance characteristics of tubular heat exchanger:
The tubular heat exchanger has a relatively simple, compact structure and low cost, but the outside of the tube cannot be mechanically cleaned. The tube bundle of the heat exchanger is connected to the tube plate, and the tube plate is respectively welded to the two ends of the shell, and a top cover is connected to the tube plate. The top cover and the shell are equipped with fluid inlet and outlet pipes. Usually a series of baffles perpendicular to the tube bundle are installed outside the tube. At the same time, the connection between the tube and the tube sheet and the shell is rigid, and the inner and outer tubes are two fluids with different temperatures. Therefore, when the temperature difference between the tube wall and the shell wall is large, due to the difference in thermal expansion between the two, a large temperature difference stress is generated, so that the tube twists or loosens the tube from the tube sheet, or even destroys the heat exchanger.
In order to overcome the temperature difference stress, a temperature difference compensation device is necessary. Generally, when the temperature difference between the tube wall and the shell wall is more than 50℃, for safety reasons, the heat exchanger should have a temperature difference compensation device. But the compensation device (expansion joint) can only be used when the temperature difference between the shell wall and the pipe wall is lower than 60-70℃ and the fluid pressure in the shell side is not high. Generally, when the shell side pressure exceeds 0.6 MPa, because the compensation ring is too thick, it is difficult to stretch and lose the function of temperature difference compensation, other structures should be considered.
Two mutually parallel steel plates are rolled into spiral runners separated from each other. Cover plates are welded on both ends of the spiral plate. The hot and cold fluids flow in the two flow channels respectively.
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