Tube-in-tube heat exchanger

Shell and Tube Heat Exchanger

To reduce temperature difference stress, a temperature difference compensation device should be installed on the tube bundle heat exchanger. Generally, when the temperature difference between the tube wall and the shell wall exceeds 50°C, for safety reasons, the heat exchanger should be equipped with 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 tube wall is below 60~70°C and the shell side fluid pressure is not high. Normally, when the shell side pressure is greater than 0.6Mpa, due to the excessively thick compensation ring, it is difficult to expand or contract, thereby losing the temperature difference compensation effect, and other structural considerations should be made.
The tubular heat exchanger's eddy current heat film primarily utilizes the eddy current heat film heat transfer technology, increasing heat transfer efficiency by altering the fluid flow state. As the medium passes over the surface of the eddy current tube, it scours the tube surface, thereby enhancing heat exchange efficiency. It can reach up to 10,000 W/m²°C. Moreover, this structure achieves corrosion resistance, high-temperature resistance, high-pressure resistance, and anti-scaling functions. In other types of heat exchangers, the fluid channels are in a fixed directional flow, creating eddies on the surface of the heat exchange tubes, which reduces the convective heat transfer coefficient.