Applications of PTFE heat exchangers

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Advantages of tetrafluoro exchange heat exchangers: I. Compared to shell-and-tube tetrafluoro heat exchangers and those using metal components, they offer many advantages. 1. Since polytetrafluoroethylene (PTFE), also known as F4, is a chemically inert material with excellent corrosion resistance, the corrosion-resistant properties of fluoroplastics are well-known. Heat exchangers made from this material can be used with more than 100 different types of media; with the exception of elemental fluorine at high temperatures, molten alkali metals, chlorine trifluoride, uranium hexafluoride, and perfluorokerosene, they can function in almost all types of media. 2. Anti-fouling property: Fluoroplastic pipes have a smooth surface, high thermal expansion, and considerable flexibility, which prevent the accumulation of scale. They also exhibit good chemical stability toward most media, thereby reducing or eliminating corrosion products to a large extent. The smooth surface has strong water-wetting properties, non-stick characteristics, and an extremely low friction coefficient, which reduces or eliminates the dirt and scale that accumulate on the pipe wall surface. Fluoroplastics have a high coefficient of thermal expansion and good flexibility; heat exchange tubes made from them, especially those that are twisted into a helical shape, experience vibrations caused by the flow of fluid, which in turn causes the scale buildup on the tube walls to fall off. As a result, the tube walls of this type of heat exchanger remain relatively clean during long-term operation. 3. It has a small size, light weight, and compact structure. Fluoroplastics have a low thermal conductivity of only 0.19 W/m·℃, which is 1/250 that of ordinary carbon steel. To reduce the thermal resistance of the tube wall and increase the overall heat transfer coefficient, thin-walled tubes are generally used; to ensure the strength of these thin-walled tubes, it is advisable to use tubes with small diameters. Due to the use of a large number of small-diameter tubes, the heat transfer area per unit volume is very large. For example, for heat exchangers with an area of 10 square units, the weight and volume of PTFE heat exchangers are only about 1/3 of those of metal or non-metallic graphite heat exchangers. It can be seen that this type of heat exchanger is compact and lightweight, thereby reducing costs related to transportation, installation, and operation. 4. Strong adaptability. Due to the flexibility of fluoroplastic pipes, their fatigue resistance to bending exceeds 100,000 cycles; their impact strength is 1.09 J/cm3 at -57 degrees and 1.63 J/cm3 at 23 degrees. As a result, the pipe bundles can be shaped into various configurations as required, and they can operate reliably over the long term under conditions of fluid impact and vibration. This is something that other corrosion-resistant materials such as graphite, glass, ceramics, and rare metals find difficult to achieve. 5. They have a long service life and are easy to maintain. Our company has a solid foundation in the research and development of fluoroplastic heat exchangers; we continuously improve the components of these heat exchangers that are prone to aging and corrosion, updating them further on the basis of what already exists in order to better meet the needs of our customers. To date, many manufacturers have been using tetrafluoroethylene heat exchangers for over 5 years, which means that significant costs can be saved just in terms of heat exchangers alone. Secondly, this tetrafluoro heat exchanger is easy to maintain; if leakage occurs during use, it can be repaired on-site immediately, along with pressure testing. This saves the customer time spent on traveling to the factory for repairs, as well as the production losses resulting from vehicle parking, something that is difficult for other heat exchangers to achieve. 6. The costs are reasonable. Although fluoroplastics, which serve as heat transfer elements, are still expensive at present, the use of small-diameter, thin-walled tubes can result in an overall heat transfer coefficient of up to 400 W/㎡·℃. When such heat exchangers are produced in bulk under well-developed manufacturing processes, their excellent corrosion resistance allows them to replace rare metals, thereby saving a significant amount of these valuable materials. Furthermore, due to the advantages of fluoroplastic heat exchangers such as corrosion resistance and anti-fouling properties, other economic benefits can be obtained during their use. Therefore, taking into account factors such as manufacturing, installation, operation, and maintenance, the actual cost is relatively low. The above advantages have been fully confirmed by fluoroplastic heat exchangers used in industrial production; abroad, they have long been widely applied to various media. Sun Wenlong from Tai’an Luyue Shengtong Chemical Equipment Co., Ltd.: 13854802951