Shell-and-tube heat exchangers As the temperature of the fluid inside and outside the tube is different, so the Shell and Tube Heat Exchanger temperature is also different. If the temperature difference between the two great Heat Exchanger will have a great thermal stress, leading to pipe bending, fracture, or pull off from the tube plate. Therefore, when the tube and the shell temperature difference exceeds 50 ℃, the need to take appropriate compensation measures to eliminate or reduce thermal stress. According to the compensation measures used, shell and Tube Heat Exchanger can be divided into the following main types:
① The fixed tube plate heat exchanger tubes at both ends of the tube plate and shell into one, simple structure, but only for cold and hot fluid temperature difference, and the shell side without mechanical cleaning heat transfer operation. When the temperature difference is large and the shell side pressure is not too high, the elastic compensation ring can be installed on the shell to reduce the thermal stress.
② floating tube heat exchanger tubes at one end of the tube plate is free to float, completely eliminate the thermal stress; and the entire tube bundle can be drawn from the shell to facilitate mechanical cleaning and maintenance. Floating head heat exchanger is widely used, but the structure is more complex, higher cost.③ U-Tube Heat Exchanger tubes are bent into each U-shaped tube, both ends were fixed in the same tube plate upper and lower areas, with the help of the partition of the tube box into the import and export of two rooms. This heat exchanger completely eliminates the thermal stress, the structure is simple than floating head, but the tube is not easy to clean.
③ U-tube heat exchanger tubes are bent into each U-shaped tube, both ends were fixed in the same tube plate upper and lower areas, with the help of the partition of the tube box into the import and export of two rooms. This heat exchanger completely eliminates the thermal stress, the structure is simple than floating head, but the tube is not easy to clean.
④ Eddy-current heat exchanger The vortex heat film heat exchanger uses the latest vortex heat film heat transfer technology to change the fluid motion state to increase the heat transfer effect. When the medium passes through the surface of the vortex tube, it scours the surface of the tube, Thermal efficiency. Up to 10000W / m2 ℃. At the same time this structure to achieve a corrosion-resistant, high temperature, high pressure, anti-scaling function. Other types of heat exchangers in the form of a fixed flow channel in the form of heat flow around the surface of the tube, convective heat transfer coefficient decreases.
Shell and tube heat exchanger by the shell, heat pipe bundle, tube sheet, baffle (baffle) and tube boxes and other components. Shell is mostly cylindrical, with internal tube bundles, tube ends fixed on the tube plate. Heat transfer of the two hot and cold fluids, one in the tube flow, known as the tube-flow fluid; the other flow in the tube, known as the shell-side fluid. In order to increase the coefficient of heat transfer of the fluid outside the tube, several baffles are usually installed in the housing. The baffle can increase the velocity of the shell side fluid, forcing the fluid to pass through the tube bundle a plurality of times along the prescribed course, and enhance the turbulence degree of the fluid. Heat exchange tube in the tube plate can be arranged in an equilateral triangle or square. Equal triangle arrangement is more compact, the tube outside the high degree of turbulence, heat transfer coefficient; square arrangement is easy to clean the pipe, suitable for scaling fluid.
Each tube through the tube is called a tube; each through the shell is called a shell. In order to improve the fluid velocity inside the tube box can be set in both ends of the partition, all the tubes are divided into several groups. So that the fluid passes through only a portion of the tube at a time, so that it travels several times in the tube bundle, which is called multi-tube. Similarly, in order to improve the flow outside the tube, can also be installed in the shell of the vertical baffle, forcing the fluid several times through the shell space, known as the multi-shell. Multi-tube and multi-shell can be used with the application.
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