The inner tube in the concentric sleeve serves as a heat exchanger for the heat transfer element. Two different diameter pipes are sleeved together to form a concentric sleeve, each of which is called a "one pass", the inner tube (heat transfer tube) of the process is connected by a U-shaped elbow tube, and the outer tube is connected in a row by a short tube. Fixed to the bracket. Heat is transferred from one fluid to the other through the inner tube wall.

Typically, the hot fluid is introduced from the upper portion and the cold fluid is introduced from the lower portion. Both ends of the outer tube in the sleeve are welded or flanged to the inner tube. The inner tube and the U-shaped elbow are connected by flanges to facilitate the cleaning and increase and decrease of the heat transfer tubes. The effective length of each heat transfer tube is 4 to 7 meters. This heat exchanger has a heat transfer area of up to 18 square meters, so it is suitable for small-capacity heat exchange.

The heat exchanger fixes the heat exchange tubes in a row on the steel frame, the hot fluid flows in the tubes, and the cooling water is uniformly dripped from the above spraying device, so it is also called a spray cooler. Spray heat exchange Outside the tube is a layer of liquid film with a high degree of turbulence. The heat transfer coefficient outside the tube is much more immersed. In addition, most of these heat exchangers are placed in the air circulation, and the evaporation of cooling water is also taken away. A part of the heat can reduce the temperature of the cooling water and increase the heat transfer driving force. Therefore, compared with the immersed type, the heat transfer effect of the spray heat exchanger is greatly improved.

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