The heat pipe heat exchanger consists of a sealed metal tube whose inner wall is covered with a core net made of capillary structure material, and the middle is empty. The tube contains a certain amount of heat carrier (such as liquid ammonia, freon), which is vaporized and flows to the cold end. The steam is condensed at the cold end, releasing latent heat of vaporization and heating the cold fluid. The condensate flows back to the hot end. What are the performance characteristics of heat pipe heat exchangers?
(1) The heat pipe heat exchanger can completely separate the cold and hot fluids through the middle partition of the heat exchanger. When a single heat pipe is damaged due to wear, corrosion, over-temperature and other reasons during operation, the operation of the heat exchanger is basically not affected. Heat pipe heat exchangers are used for fluids that are flammable, explosive and corrosive, and have high reliability in heat exchange situations.
(2) The cold and hot fluids of the heat pipe heat exchanger flow completely separately, which can easily realize the countercurrent heat exchange of the cold and hot fluids. Both cold and hot fluids flow outside the tube. Since the heat transfer coefficient flowing outside the tube is much higher than the heat transfer coefficient flowing inside the tube, it is very economical to use in 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 expansion of the heating surface.
(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 avoids the largest corrosion area as much as possible.