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How to Optimize the Design of Finned Tube Phase Change Heat Storage

Finned tube structure

Finned tubes are widely used in power, chemical and other industries. Many spiral heat transfer surfaces or threaded tubes can be regarded as finned tubes. It has a significant effect on expanding the heat transfer area and promoting turbulence, and it has a great effect on both single-phase-convection heat transfer and phase-change convective heat transfer. 

The structure of the finned tube heat exchanger is basically the same as the general shell and tube heat exchanger. Just use finned tubes instead of light tubes as the heat transfer surface. Finned tube heat exchangers are also often used to heat or cool the gas outside the tube, and steam or water is passed through the tube, such as air coolers, boiler economizers, radiators, etc.

 

Finned tube material

The finned tube has a wide range of materials, including stainless steel, carbon steel, titanium and copper alloys, etc. The corrosion resistance of the industry has greatly increased. Laser welding spiral fin tube is a new, wear-resistant and efficient heat exchange material in the fin tube welding industry. It is a high-efficiency and energy-saving heat exchange element. 

It has high heat exchange efficiency, large heat dissipation area, long service life, and adaptability. The temperature range is wide, the pressure is high, and it conforms to the national energy-saving and environmental protection emission standards. It is widely used in waste heat recovery, petrochemical industry, power station boilers, economizers, passenger cars, industrial and civil building heating, refrigeration systems and other industries.

Murphy high frequency finned tube scaled

Laser welding finned tube

Murphy Thermal Energy has been focusing on the development and research of integral laser welded finned tubes and single-layer double-layer spiral coils. Now it has been applied in various fields such as boilers, chemicals, wall-hung boilers, ships, waste heat power generation, and home decoration. 

The surface is most used as a heating surface in the boiler industry. It is environmentally friendly, energy-saving and efficient. Laser-welded finned tubes are currently the most technologically advanced product, and they have irreplaceable advantages. The advantages of heat exchange waste heat in boilers and chemical industries have been fully utilized. 

The laser welding finned tube is a spiral fin tube laser welding machine that integrates laser technology, hardware molds, and CNC automatic control. It is simple to operate and flexible and convenient to manufacture. Overcome a series of problems such as fracture, slow speed, poor forming and wrinkling of finned tubes in the welding process. 

Now we have successfully mastered all the parameters and parameters in the welding of finned tubes such as spiral fin tubes and heat exchangers. Production and coordination of automatic fixtures. The spiral fin tube laser welding machine is composed of a high-power automatic laser welding machine, fully automatic CNC control fixture, automatic feeder and other auxiliary equipment.

 

Features of laser welding finned tube

The following Morphy will talk about the five characteristics of laser welding of spiral fin tubes:

1: The thickness of the base tube can be 0.8-1.5 mm, and the thickness of the fin can be 0.3-1 mm, which greatly saves material costs compared to other processes.

2: High penetration rate, can prevent crevice corrosion, prolong service life, and reduce heat transfer resistance.

3: Break through the material limitation and can use different materials for processing.

4: Easy secondary processing, can be directly coiled and bent.

5: The welding heat-affected zone is small and the metallographic change is small, making it possible to process small diameter fin tubes.

 

Finned tube production control

 

  1. The CCD monitoring system is used in the production process to monitor the welding area in the whole process.

   2. The first article is approved, and the metallographic analysis system is used to obtain the welding status to ensure that the product quality is qualified before continuous production.

  1. Choose high-quality, high-standard materials and start from the source to ensure that the product quality is qualified.

   4. Break through the material limit and can use different materials for processing.

  5. Easy to secondary processing, can be directly coiled and bent.

 6. The welding heat-affected zone is small, and the metallographic change is small, making it possible to process small-diameter finned tubes.

 7. The thickness of the base tube can be 0.8-1.5 mm, and the thickness of the fin can be 0.3-1 mm, which greatly saves material costs compared to other processes.

 

Finned tube heat exchanger application

 

The heat exchanger is the key equipment of the thermodynamic system. The tube-fin heat exchanger is a heat exchanger structure with high technical content and complicated production process. The cold and hot fluid walls exchange heat in a cross-flow. The tube carries refrigerant and the outside of the tube is air. The main body of the tube is phase change heat transfer. The tube is generally arranged in a serpentine shape with multiple tubes, and the fins are divided into single, double or multi-row structures.

 

This kind of heat exchanger is widely used in industrial fields such as petrochemical industry, aviation, vehicles, power machinery, air separation, deep and low temperature, atomic energy and aerospace. For example, superheaters, economizers, air preheaters, condensers, deaerators, feedwater heaters, cooling towers, etc. in boiler thermal systems; hot blast stoves, air or gas preheaters in metal smelting systems, Waste heat boilers, etc.; evaporators, condensers, regenerators in refrigeration and low-temperature systems; heating and cooling equipment widely used in the petrochemical industry, sugar evaporators and pulp evaporators in the sugar industry and paper industry, These are numerous examples of heat exchanger applications.

 

Due to the limited reserves of coal, oil, and natural gas resources in the world, the world is facing an energy shortage situation. Countries are committed to the development of new energy, and actively carry out preheat recovery and energy saving work. Therefore, the application of heat exchangers is also related to the development of energy. It is closely related to saving. In this work, the heat exchanger also plays an important role, and its performance directly affects the efficiency of energy utilization. As an effective device for energy utilization and energy conservation, heat exchangers also play an important role in waste heat utilization, nuclear energy utilization, solar energy utilization, and geothermal energy utilization.

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