What are the application fields of laser welded fin tubes?
As an efficient and energy-saving heat exchange element, laser welded fin tubes have been widely used in many industrial fields due to their unique structural and performance advantages.
Its core principle is to closely combine the fins and the base tube through laser welding technology to form a high-density heat transfer surface, thereby significantly improving the heat exchange efficiency. The following is a detailed analysis of its application scenarios and technical characteristics from the main fields such as energy and power, petrochemicals, environmental protection engineering, refrigeration and air conditioning, and transportation.
1. Energy and power field: a reliable choice under high temperature and high pressure environment
In thermal power plants, laser welded fin tubes are widely used in key equipment such as boiler economizers and air preheaters.
For example, after a supercritical unit project used nickel-based alloy laser welded fin tubes, the heat transfer coefficient on the flue gas side increased by 40%, and at the same time solved the problem of traditional high-frequency welded fin tubes being prone to cracking at a high temperature of 600°C.
Its advantages are mainly reflected in three aspects:
First, the metallurgical bonding formed by laser welding can withstand higher working pressure (up to 35MPa or more);
Second, the fin spacing can be precisely controlled to within 2mm, which meets the self-cleaning requirements of high-ash flue gas in coal-fired power plants;
Third, through material innovation, the equipment life is extended to more than 100,000 hours.
The nuclear power field pays more attention to the corrosion resistance of materials
The waste heat removal system of the power station uses zirconium alloy laser-welded fin tubes, which perfectly solves the pitting problem under seawater cooling conditions while ensuring heat transfer efficiency.
This technological breakthrough has extended the maintenance cycle of nuclear power equipment from the original 18 months to 5 years, greatly reducing operating costs.
2. Petrochemical Industry: Experts in Harsh Media Treatment
In the atmospheric and vacuum distillation unit of the refining unit, laser-welded fin tubes show unique adaptability to high-sulfur crude oil.
During the transformation, the refinery adopted a bidirectional spiral fin design to reduce the pressure drop of the tube by 28%. At the same time, the dense protective layer formed by laser welding controlled the sulfur corrosion rate below 0.05mm/a.
More noteworthy is the application in ethylene cracking furnaces. The special three-dimensional fin structure improves the uniformity of heat flux distribution by 65%, effectively preventing local overheating and coking of the furnace tubes.
The field of natural gas liquefaction (LNG) faces extreme working conditions of -196℃.
The oil project uses aluminum-magnesium alloy laser-welded finned tubes. Through the innovative multi-channel micro-rib structure design, the volume of the heat exchanger is reduced by 40%, while the liquefaction efficiency is increased by 15%. This compact equipment is particularly suitable for the space restrictions of floating LNG production storage and unloading devices (FLNG).
3. Environmental protection engineering: technological innovation of waste gas treatment
In the sintering flue gas desulfurization system of the steel industry, laser-welded finned tubes solve the technical bottleneck of easy detachment of traditional enamel tubes.
The composite structure of 316L stainless steel base tube + titanium alloy fin can maintain stable heat transfer performance in a strong acid environment with a pH value of 1-2. With the special anti-ash coating technology, the system energy consumption is reduced by 22%.
The flue gas waste heat recovery of waste incineration power generation faces a more complex corrosive environment.
The Renewable Energy Utilization Center uses gradient material laser welded fin tubes: Hastelloy C-276 is used in the flue gas inlet section, 254SMO stainless steel is used in the middle section, and ordinary 316L is used in the outlet section. This differentiated design saves 35% of material costs while ensuring performance. After the system was put into operation, the power generation per ton of garbage increased to 580kWh, setting a new industry high.
4. Refrigeration and air-conditioning industry: the hidden champion of energy efficiency improvement
In the liquid cooling system of the data center, the microchannel laser welded fin tube has achieved a revolutionary breakthrough. With the 0.3mm ultra-thin fin design, the cooling power consumption of a single cabinet is reduced to less than 50W, and the PUE value is stably controlled within 1.15.
The core of this technology is that laser welding can achieve nano-level bonding between fins and tube walls, eliminate contact thermal resistance, and make the heat transfer coefficient reach 14000W/(m²·K).
The field of household air conditioning is also quietly changing
The copper-aluminum composite fin tube technology is used to solve the problem of dissimilar metal connection through laser welding, which reduces the weight of the heat exchanger by 30%, reduces the refrigerant charge by 25%, and breaks through 6.0 in energy efficiency ratio (APF), reaching 1.5 times the national first-level energy efficiency standard.
V. Transportation: The perfect combination of lightweight and high efficiency
The thermal management system of new energy vehicle batteries is an emerging application field.
The porous laser-welded fin tube is used, and the capillary core structure design is used to control the temperature difference of the battery pack within ±1℃, and the fast charging cycle life is increased to more than 4000 times.
This design integrates 12 components of the traditional liquid cooling system into one module, reducing the weight by 4.8kg/vehicle.
Breakthroughs have also been made in the field of ships
The LNG fuel tank boil-off gas (BOG) reliquefaction system uses spirally wound laser-welded finned tubes, which can still maintain a heat exchange efficiency of more than 95% under the ship’s swaying conditions. Compared with traditional shell-and-tube heat exchangers, the equipment volume is reduced by 60%, helping to reduce the ship’s energy efficiency design index (EEDI) by 15%.
VI. Frontier Exploration and Future Trends
At present, laser-welded finned tube technology is developing in depth in three directions:
First, intelligent adaptive structure, alloy finned tubes, which can automatically adjust the fin angle according to temperature changes;
Second, the application of nano-composite materials, graphene-coated finned tubes have achieved a 300% increase in heat transfer coefficient in the laboratory;
Third, the integration of additive manufacturing technology, 3D-printed finned tubes with internal integrated microchannels, has brought revolutionary changes to the cooling system of aircraft engines.
Datang fin tube product’s specification outside diameter from 18 mm to 273 mm finned tube, The process includes high-frequency welded fin tubes, extruded fin tubes, L / L L / K L fin tubes, G -type Embedded fin tubes, low fin tubes, inner fin tubes, elliptical fin tubes, longitudinal fin tube,H type fin tube, the annual capacity can reach 100,000 tons.
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