Finned Tubes for Grain Drying Heat Exchangers

The finned tubes commonly used in grain drying heat exchangers are mainly steel high-frequency welded finned tubes or steel-aluminum composite finned tubes. This spiral fin structure effectively enhances airflow turbulence, creating a turbulent flow state, thereby improving drying efficiency and reducing energy consumption.

High-frequency Welded Finned Tubes

High-frequency welded finned tubes achieve metallurgical bonding between the fins and the base tube through high-frequency current, resulting in high contact rate and low thermal resistance, significantly improving heat transfer efficiency. They are suitable for media such as steam and hot water. Their compact structure and high-temperature resistance contribute to uniform heating and reduce the risk of local overheating. Furthermore, the low cost of carbon steel base material makes them suitable for large-scale applications.

316 stainless steel finned tubes use a precision winding process, offering strong corrosion resistance and oxidation resistance. They can adapt to environments containing acids, alkalis, or high humidity, extending equipment life. They are particularly suitable for grain drying scenarios with strict hygiene requirements, preventing material contamination.

Aluminum finned tubes are lightweight and have good thermal conductivity, but their corrosion resistance is relatively poor. Surface treatment (such as hot-dip galvanizing) is required to enhance their adaptability. Their lightweight characteristics can reduce equipment load, making them suitable for weight-sensitive systems.

Aluminum Finned Tubes Extruded Fin Tubes

High-frequency welded finned tubes have significant advantages in thermal efficiency and durability, while 316 stainless steel finned tubes focus more on long-term stability in harsh environments; aluminum finned tubes require a balance between cost and protection needs. Actual selection should be based on specific process conditions, budget, and maintenance strategies.

Grain drying heat exchangers usually use steel-aluminum composite finned tubes. This type of finned tube combines the pressure resistance of steel pipes with the excellent thermal conductivity of aluminum, effectively improving heat transfer efficiency and adapting to the high-temperature and high-humidity environment during the drying process.

Common types include wound-fin and extruded finned tubes, which are compounded through special processes to ensure long-term operational stability.

In practical applications, the design of finned tubes is optimized according to the specific working conditions of the drying room. For example, the fin height, spacing, and material thickness are matched to the type of heat medium (such as steam or hot water) and air flow conditions to achieve uniform heating and energy-saving effects. In addition, due to their corrosion resistance and high-temperature resistance, 304 stainless steel finned tubes are also used in some grain drying applications involving high humidity or highly corrosive environments.

Datang Fin Tube Technical Parameters