In order to reduce the temperature difference stress, a temperature difference compensation device should be installed on the tube heat exchanger. Generally, when the temperature difference between the tube wall and the shell wall50℃When above, for safety reasons, the heat exchanger should have a temperature difference compensation device. However, the compensation device (expansion joint) can only be used when the temperature difference between the shell wall and the pipe wall is lower than60~70℃and the shell-side fluid pressure is not high, generally the shell-side pressure is greater than0.6MpaAt this time, because the compensation ring is too thick and difficult to expand and contract, and loses the temperature difference compensation function, other structures should be considered.
The vortex hot film of the tube heat exchanger mainly uses vortex hot film heat transfer technology, which increases the heat transfer effect by changing the fluid motion state. When the medium passes through the vortex tube surface, it washes the tube surface, thereby improving the heat transfer efficiency. Reachable10000W/m2℃. At the same time, this structure achieves corrosion resistance, high temperature resistance, high pressure resistance, and anti-fouling functions. The fluid channels of other types of heat exchangers are in the form of fixed direction flow, forming flow around the surface of the heat exchange tube, and the convection heat transfer coefficient is reduced.