The Difference Between Tubular Heat Exchanger And Tube And Shell Heat Exchanger

1, The structure is exactly the same, but the use of different.
2, The tube type is the material liquid piping process (that is, inside the pipe), the cooling water shell process (between the pipe and the shell), the tube shell type is the opposite.
The structure of tubular heat exchanger is relatively simple, compact and cheap, but the tube can not be mechanically cleaned. The tube bundle of the heat exchanger is connected with a tube plate, which is welded at both ends of the shell, and is connected with a top cover, and the top cover and the shell are equipped with a fluid inlet and outlet nozzle. A series of baffle plates perpendicular to the tube bundle are usually arranged outside the tube. At the same time, the connection between the pipe and the tube plate and the shell is rigid, and the inside and outside the pipe are two kinds of fluids with different temperatures. Therefore, when the temperature difference between the tube wall and the shell wall is large, due to the different thermal expansion of the two, a large temperature difference stress is generated, and the tube is twisted or the tube is loosened from the tube plate, and even the heat exchanger is destroyed.
The shell and tube heat exchanger is composed of a shell, a heat transfer tube bundle, a tube plate, a baffle plate and a tube box. The shell is mostly cylindrical, and the tube bundle is arranged inside, and the two ends of the tube bundle are fixed on the tube plate. The cold and hot fluids for heat transfer, one of which flows in the tube, are called tube flow; The other flows outside the tube, called shell flow. In order to improve the heat transfer coefficient of the fluid outside the tube, a number of baffles are usually installed in the shell. The baffle can increase the velocity of the shell fluid, force the fluid to pass through the tube bundle several times according to the specified path, and enhance the degree of fluid turbulence. The heat exchange tubes can be arranged in equilateral triangles or squares on the tube plate. The equilateral triangle arrangement is compact, the fluid turbulence outside the tube is high, and the heat transfer coefficient is large. The square arrangement is convenient for cleaning outside the tube and is suitable for fluids that are easy to scale.