Heat pipe heat exchanger
A sealed metal pipe whose inner wall is covered with a layer of core mesh made of capillary structural material, with the middle being empty. A certain amount of heat carrier (such as liquid ammonia, Freon, etc.) is contained in the tube, which is vaporized and flows to the cold end. The steam is condensed at the cold end, releasing the latent heat of vaporization, and heating the cold fluid. The condensate flows back to the hot end, and so on.
1. The heat pipe heat exchanger can completely separate the hot and cold fluids through the middle partition of the heat exchanger. During operation, a single heat pipe will not affect the operation of the heat exchanger if it is damaged due to wear, corrosion, overtemperature and other reasons. Heat pipe heat exchangers have high reliability for easy, explosive, and corrosive fluid heat exchange applications.
2. The cold and hot fluids of the heat pipe heat exchanger are completely separated and flowed, and it is relatively easy to realize the countercurrent heat exchange of the cold and hot fluids. Both hot and cold fluids flow outside the tube. Since the heat transfer coefficient of the flow outside the tube is much higher than the heat transfer coefficient of the flow inside the tube, it is very economical for low-grade heat energy recovery occasions.
3. For fluids with high dust content, heat pipe heat exchangers can solve the problems of heat exchanger wear and ash blocking through structural changes and extended heating surfaces.
4. When the heat pipe heat exchanger is used for the recovery of corrosive flue gas waste heat, the temperature of the heat pipe wall can be adjusted by adjusting the heat transfer area of the evaporation section and the condensation section, so that the heat pipe can avoid the largest corrosion area as much as possible.
Spray heat exchanger
Hot fluid flows through the bare tubes, and cooling water sprays through the coils.
This heat exchanger fixes the heat exchange tubes in a row on a steel frame. The hot fluid flows in the tubes, and the cooling water is evenly sprayed from the spraying device above, so it is also called a spray cooler. The outer surface of the spray heat exchanger is a layer of liquid film with a high degree of turbulence, and the heat supply coefficient outside the tube is much larger than that of the immersion type. In addition, most of these heat exchangers are placed in the air circulation, and the evaporation of the cooling water also takes away some of the heat, which can reduce the temperature of the cooling water and increase the driving force for heat transfer. Therefore, compared with the immersion type, the heat transfer effect of the spray heat exchanger is greatly improved.
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