In the process of operation, the shell-and-tube heat exchanger is mainly a partition wall heat exchanger which is closed as a heat transfer surface in the tube bundle, and the heat exchanger structure is relatively simple, and is very easy to operate. It is reliable and can be used in the manufacture of various structural materials. It can be used under high temperature and high pressure. It is the most widely used type.
Shell-and-tube heat exchangers still dominate. The heat exchange efficiency, compact structure and metal material consumption of the whole equipment are not as good as other new heat exchange equipments, but it has strong structure, large operational flexibility, adaptability and reliability. High, wide selection of materials, large processing capacity, can withstand high temperature and high pressure, so it is still widely used in engineering.
Shell-and-tube heat exchanger structure
The shell-and-tube heat exchanger is mainly composed of a casing, a heat transfer tube bundle, a tube sheet, a baffle (baffle) and a pipe box, and the casing is mostly cylindrical, and a tube bundle is arranged inside. Both ends of the tube bundle are fixed to the tube sheet. The two types of hot and cold fluids for heat exchange, one flowing in the tube, called the tube-flow fluid, and the other flowing outside the tube, called the shell-side fluid. In order to increase the heat transfer coefficient of the fluid outside the tube, a number of baffles are usually installed in the housing.
The baffle of the shell-and-tube heat exchanger can effectively increase the velocity of the shell-side fluid, so that the fluid can be forced to pass through the tube bundle multiple times in a prescribed path to enhance the degree of fluid turbulence. The heat exchange tubes can be arranged on the tube sheets in an equilateral triangle or square. The equilateral triangles are arranged in a compact manner, the fluid outside the tube is highly turbulent, the heat transfer coefficient is large, and the square arrangement is convenient for cleaning outside the tube, and is suitable for fluids that are easy to scale.