The heat exchange tubes of tubular heat exchangers generally use seamless steel pipes. In addition to plain tubes, various types of enhanced heat transfer tubes can also be used, such as finned tubes, spiral groove tubes, threaded tubes, etc. Heat exchange tube materials are mainly selected according to process conditions and medium corrosivity. Common metal materials include carbon steel, low alloy steel, stainless steel, copper, copper nickel alloy, aluminum alloy, iron, etc; Non metallic materials include graphite, ceramics, polytetrafluoroethylene, etc.
Heat exchange tube parameters
The commonly used dimensions (outer wall X wall thickness) of heat exchange tubes in tubular heat exchangers are seamless steel pipes of p19mmX2mm, p25mmX2.5mm, 38mmX2.5mm, and stainless steel pipes of 25mm X2mm and 38mmX2.5mm. Standard pipe lengths include 1.5m, 2.0m, 3.0m, 4.5m, 6.0m, 9.0m, etc. The number, length, and diameter of pipes are determined by the heat transfer area of the heat exchanger, and the selected diameter and length should meet the specifications. Tubular heat exchangers generally use large diameter pipes for viscous or dirty fluids, while small diameter pipes are used for cleaner fluids.
Tubular heat exchanger is the most widely used type of heat exchanger in chemical and alcohol production. It mainly consists of shell, tube plate, heat exchange tube, head, baffle, etc. The required materials can be made of ordinary carbon steel, red copper, or stainless steel. During heat exchange, a fluid enters from the connecting tube of the head, flows in the tube, and flows out from the outlet tube at the other end of the head, which is called the tube pass; Another type of fluid enters through the connecting pipe of the shell and flows out from another connecting pipe on the shell, which is called the shell side.