Spray heat exchanger
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. Casing heat exchanger The sleeve heat exchanger is a concentric sleeve made of straight tubes of different diameters and is connected by a U-shaped elbow. In this heat exchanger, one fluid is in the tube, and the other A fluid travels an annulus, both of which can achieve a higher flow rate, so the heat transfer coefficient is larger. In addition, in the casing heat exchanger, the two fluids can be pure countercurrent, and the logarithmic average driving force is large. The casing heat exchanger has a simple structure, can withstand high pressure, and is convenient to use (can increase or decrease the number of pipe segments as needed). Especially, the casing heat exchanger has a large heat transfer coefficient, a large heat transfer driving force and can withstand high pressure. The advantages.