Laser welded finned tube and finned tube heat exchanger
Murphy finned tubes are widely used in power and chemical 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 counter-flow heat transfer and phase change convection heat transfer. The structure of Murphy finned tube heat exchanger is basically the same as that of a general shell and tube heat exchanger. Only the finned tube is used instead of the light tube as the heat transfer surface. Finned tube heat exchangers are also often used to heat or cool the gas outside the tube, and pass steam or water inside the tube, such as air coolers, boiler economizers, radiators, etc.
The finned tube has a wide range of materials, including stainless steel, carbon steel, titanium-copper alloy, etc., and industries such as corrosion resistance have greatly increased.
Laser welded spiral finned tube is a new type of wear-resistant and highly efficient heat exchange material in the finned tube welded industry. It is an energy-efficient heat exchange element with high heat exchange efficiency, large heat dissipation area, long service life, and adaptability. It has a wide temperature range, high pressure resistance, and meets national energy conservation and environmental protection emission standards. Widely used in waste heat recovery, petrochemical, power station boilers, economizers, passenger cars, industrial and civil building heating, refrigeration systems and other industries.
Murphy Thermal Energy (Suzhou) Co., Ltd. has been focusing on the development and research of integrated laser welding finned tubes and single-layer double-layer spiral coils. It is used in various fields such as power generation and home improvement. Surface is the most widely used in the boiler industry as a heating surface, environmental protection, energy saving and high efficiency. Laser welded finned tubes is currently the most advanced product, which has irreplaceable advantages. In the boiler, chemical industry and other heat exchange waste heat advantages have been fully utilized.
Laser welded finned tube is a helical finned tube laser welding machine that integrates laser technology, metal molds, and NC automatic control into one. It is simple to operate and flexible and convenient to produce. It has overcome a series of problems such as fracture, slow speed, poor molding, and wrinkling of the finned tube during welding. Now it has successfully developed all parameters and technologies of Laser welded finned tubes.
The spiral finned tube laser welding machine is composed of a high-power automatic laser pick-up machine, a fully-automatic numerical control fixture, an automatic feeder and other auxiliary equipment. Murphy will soon talk about the five characteristics of laser welding of spiral finned tubes:
1: The thickness of the base pipe can be 0.8-1.5 mm, and the thickness of the fins can be 0.3-1 mm. Compared with other processes, the material cost is greatly saved.
2: High penetration rate, can prevent gap corrosion, prolong service life, and reduce heat transfer heat resistance.
3: Break through the limitation of materials and use different materials for processing.
4: Easy re-processing, can be directly coiled and bent.
5: The welding heat-affected zone is small, and the metallographic changes are small, making small-diameter finned tube processing possible.
In terms of quality control:
1, Using of the CCD monitoring system in the production process, monitoring the welded area throughout.
2. The first article is approved, and a metallographic analysis system is used to obtain the welding status to ensure continuous production after the product quality is qualified.
3, choose high-quality, high-standard materials, starting from the source to ensure that the product quality is qualified.
4: Break through the material limitation and use different materials for processing.
5: Easy for re-processing, can be directly coiled and bent.
6: The welding heat-affected zone is small, and the metallographic changes are small, making small-diameter finned tube processing possible.
7: The thickness of the base pipe can be 0.8-1.5 mm, and the thickness of the fins can be 0.3-1 mm. Compared with other processes, the material cost is greatly saved.
The heat exchanger is the key equipment of the thermal system. The tube-fin heat exchanger is a heat exchanger structure with high technical content and complicated production process. Cross-flow heat exchange between the cold and hot fluids takes the refrigerant inside the tube and air outside the tube. Phase change heat transfer is the main part of the tube. Generally, the pipes are arranged in a serpentine shape with multiple tubes, and the fins are divided into single, double or multi-row structures. This 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, super-heaters, economizers, air pre-heaters, condensers, deaerators, feed-water heaters, cooling towers, etc. in boiler thermal systems; hot blast stoves, air or gas pre-heaters in metal smelting systems, Waste heat boilers, etc .; evaporators, condensers, regenerators, etc. in refrigeration and low temperature systems; heating and cooling equipment widely used in the petrochemical industry, sugar liquid 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 and the shortage of energy resources, all countries are committed to the development of new energy sources, and actively carry out preheat recovery and energy conservation. Therefore, the application of heat exchangers and energy development And economy are closely linked. In this work, the heat exchanger also plays an important role, and the performance of the heat exchanger also directly affects the efficiency of energy utilization. The heat exchanger, as aneffective equipment for energy utilization and energy conservation, also plays an important role in waste heat utilization, nuclear energy utilization, solar energy utilization, and geothermal energy utilization.
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