Tubular heat exchanger is the most widely used heat exchanger in chemical and alcohol production. It is mainly composed of a shell, a tube sheet, a heat exchange tube, a head, and a baffle. The required material can be made of ordinary carbon steel, copper, or stainless steel. During heat exchange, a fluid enters the pipe from the connecting pipe of the head and flows in the pipe, and flows out from the outlet pipe at the other end of the head. The other fluid enters through the connector of the shell and flows out from the other connector on the shell. Performance characteristics of tubular heat exchangers.
The structure of the tube heat exchanger is relatively simple, compact, and inexpensive, but the outside of the tube cannot be mechanically cleaned. The heat exchanger tube bundle is connected to the tube plate, and the tube plate is respectively welded to the two ends of the shell, and a top cover is connected to the tube plate. The top cover and the shell are equipped with fluid inlet and outlet pipes. A series of baffles perpendicular to the tube bundle are usually installed outside the tube. The connection between the tube and the tube sheet and the shell is rigid, and the inside and outside of the tube are fluids of two different temperatures. When the temperature difference between the tube wall and the shell wall is large, the thermal expansion of the two causes a large temperature difference stress, and the tube twists or causes the tube to loosen from the tube sheet. When the temperature difference between the tube wall and the shell wall is more than 50℃, the heat exchanger should have a temperature difference compensation device. The compensation device (expansion joint) can only be used when the temperature difference between the shell wall and the pipe wall is lower than 60-70℃ and the fluid pressure in the shell side is not high.