1 Medium in the phase change zone can accomplish its evaporation and condensation in 2 independent lumens, because of this, comparing with gravity assisted heat tube, the composite hollow section steel tube has a higher ultimate value, and it has stronger ability of heat exchange, for the gravity assisted heat tube has its medium evaporated and condensed in the same cross section chaotically.
2 In general condition of heat exchange, the composite hollow section steel tube has much higher temperature in tube wall of heat source than the light tube. This feature is suitable in the situation of picking up heat. The composite hollow section steel tube can recycle more energy; meanwhile, the equipment using the composite hollow section steel tubes can have longer service life and more excellent availability.
3 The composite hollow section steel tube has a composite structure, so it is more reliable in preventing leakage. For this feature, the composite hollow section steel tube is applicable to the cases banning the mixture of cold and thermal Medias.
4 The typical structure of the composite hollow section steel tube makes cold and thermal medias of different features can choose different materials and standards to cooperate. This trait can make sure that the least consumption of special metal in the situation of heat exchange.
Because of the advantages of the composite hollow section steel tube, it is now widely used in flue gas desulfurization engineering, heat recovery of reaction kettle; recycle of waste heat and so on. There is no doubt that the composite hollow section steel tube is one of the most useful API steel pipes in constructing process.