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The steel aluminum fin tube heat exchanger combines the high strength of steel tubes with the high thermal conductivity of aluminum fins to achieve a perfect balance between pressure resistance and efficient heat transfer. The heat transfer efficiency is 3-5 times higher than that of light tubes, making it an ideal choice for industrial heat exchange.
Steel-aluminum finned tube heat exchanger is a high-efficiency heat exchange equipment widely used in petroleum, chemical, electric power, metallurgy, food and other fields.
Its core component is the steel-aluminum composite finned tube, which consists of two parts: the base tube and the fin. The base tube is usually made of high-quality steel with high strength and corrosion resistance; the fin is made of aluminum alloy material with good thermal conductivity and low density.
I. Definition and structural composition of steel-aluminum finned tube heat exchanger
The steel-aluminum finned tube heat exchanger is a high-efficiency heat exchange equipment with steel tube as base tube and aluminum sheet as fin. By combining aluminum fins with steel tubes, the high strength of steel and the high thermal conductivity of aluminum are used to achieve the dual needs of “pressure resistance” そして “efficient heat transfer”. Its core structure includes:
Base tube: usually carbon steel (such as Q235, 20# steel) or stainless steel (such as 304, 316L), which bears the function of medium circulation and pressure bearing.
Fin: Made of pure aluminum (such as 1060 aluminum) or aluminum alloy (such as 3003 aluminum), it is fixed on the outer surface of the base tube by winding, extrusion or welding to expand the heat dissipation area.
Shell/frame: steel or other materials are selected according to the working conditions to support the tube bundle and form the medium flow channel.
II. Working principle of steel-aluminum finned tube heat exchanger
Heat transfer path:
The hot medium (such as steam, high-temperature flue gas) flows through the steel tube, and the heat is transferred to the aluminum fins through the steel tube wall. Then the fin surface and the external cold medium (such as air, cooling water) are convectively exchanged. The expansion area of the fin can significantly improve the heat transfer efficiency (3-5 times higher than the heat transfer coefficient of the bare tube).
III. Key advantages of steel-aluminum finned tube heat exchanger principle:
The steel-based tube has strong pressure resistance (can withstand pressure above 10MPa) and is suitable for high-pressure fluids;
The aluminum fin has a high thermal conductivity (about 200W/m・K) and a low density (only 1/3 of steel), which improves the heat dissipation efficiency while being lightweight.
IV. Structural features of steel-aluminum finned tube heat exchanger
The steel-aluminum finned tube heat exchanger is mainly composed of shell, tube bundle, フィン付きチューブ, head, pipe and other parts. The tube bundle is the core component of the heat exchanger, which is composed of multiple steel-aluminum composite finned tubes. These fins have various shapes, including rectangular, triangular, trapezoidal, etc., which can effectively increase the heat transfer area and improve the heat transfer efficiency.
V. Working principle of steel-aluminum finned tube heat exchanger
The working principle of steel-aluminum finned tube heat exchanger is to use the principles of heat conduction and convection to achieve heat transfer. During the heat exchange process, one fluid (hot fluid) flows in the tube and the other fluid (cold fluid) flows outside the tube. The hot fluid transfers heat to the finned tube through the tube wall, and the finned tube transfers heat to the cold fluid. Due to the presence of fins, the contact area between the hot fluid and the cold fluid is increased, which improves the heat transfer efficiency.
VI. Performance advantages of steel-aluminum finned tube heat exchanger
High heat transfer efficiency: Steel-aluminum composite finned tubes have excellent thermal conductivity and large heat transfer area, which makes the heat transfer efficiency of steel-aluminum finned tube heat exchangers higher. Experiments show that its heat transfer efficiency can be increased by 20% to 30%.
Good corrosion resistance: The base tube is made of high-quality steel and has good corrosion resistance; the fins are made of aluminum alloy materials and have good oxidation resistance.
Lower operating cost: Due to its high heat transfer efficiency and good corrosion resistance, it can reduce energy consumption and maintenance costs during operation.
Light weight: The specific gravity of aluminum is small, which makes the heat exchanger made of steel-aluminum composite finned tubes light in weight and easy to install and transport.
Low air resistance: After processing and forming, the surface is smooth and wrinkle-free, and air can easily penetrate from the fin spacing, reducing the resistance of air flow and improving heat exchange efficiency.
VII. Application fields of steel-aluminum finned tube heat exchangers
Steel-aluminum finned tube heat exchangers are widely used in many fields:
Petrochemical industry: In the process of crude oil distillation, steel-aluminum finned tube heat exchangers can achieve efficient heat exchange and improve the accuracy and production efficiency of distillation.
Power: The steam heat exchange system used in power plants can withstand the long-term impact of high-temperature and high-pressure steam.
Metallurgy: Stable operation under high temperature environment to ensure the heat transfer efficiency in the metallurgical process.
Food drying: By increasing the heat exchange area and improving the drying efficiency, it is widely used in the food processing industry.
