The problem of tube oxygen corrosion in finned tube heat exchangers has always been a key problem to be solved in the industry. If we can solve the problem of corrosion in oxygen-containing medium, it will play a positive role in the development of the existing technology. In the long-term production practice, Murphy also summarized some methods to solve the problem of internal corrosion of the fin tube.
Solution to finned tube corrosion
When designing the heating system of the finned tube heat exchanger, it is necessary to avoid mutual circulation with oxygen as much as possible and to seal as much as possible. When replenishing water to the fin tube, it should be deoxidized. When the heat exchanger stops heating, it should be fully maintained with a drying method or deoxygenated water. Also, when testing the pressure of the newly installed heat exchanger, whether it is hydraulic testing or adding solvents, non-toxic rust inhibitors should be used.
During use, if the finned tube heat exchanger is not hot, please check whether the water inlet filter is unblocked, the water inlet pipe is hot, the return pipe is hot, and the exhaust valve always releases warm water. In this case, the water filter should be loosened. If it is clogged, you can use a brush and clean water to clean it to solve the problem.
Besides, check whether the pipeline exhaust system is normal, especially for users who have just installed or just completed the modification, check whether the high point of the pipeline and the exhaust valve set at the end of the pipeline discharge the gas in the system; check whether the system pressure is sufficient Big? Do many users use finned tube heat exchangers? Finned tubes in groups at the ends are usually not hot enough. If the temperature difference between the front and rear groups is large and it is not blocked by air, it must be checked. Does the system pressure meet the standard?
At the same time, the following factors will also affect the heat dissipation of the finned tube
(1) The diameter of the fin tube: Many times we will find that the increase in the diameter of the fin tube will improve the corresponding heat dissipation. However, this method is also disadvantageous, so Murphy’s technical experts recommend a comprehensive consideration.
(2) The spacing and height of the tube are also the main reasons that directly affect the heat dissipation of the tube. If the tube spacing is small, the heat dissipation will inevitably increase. Too large or too small spacing will have adverse effects. It is important to choose the right spacing. The finned tube also has a height. Once the height of the tube is increased, the heat dissipation area will increase, and then the heat dissipation capacity will increase. Besides, no increase is allowed and must be considered reasonable.
(3) The thermal contact resistance and the number of heat sinks will affect the heat dissipation of the heat sink tube. The contact thermal resistance has a great influence.
Finned tube future development
With the continuous innovation of technology, the application of finned tube heat exchangers in many industries has been significantly improved. For example: HVAC, Chemical, Food&Drink manufacturing etc. With the continuous improvement of people’s daily life, it is increasingly necessary to use finned tubes to protect the environment. Murphy Thermal has always believed that with the continuous updating of technology, the corrosion problem in the finned tube will also be effectively solved.
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