Spiral Finned Tube Air Pre Heater In Boiler Q235 Electric Preheater For Heat Transfer

Spiral Finned Tube Air Preheater for High Heat Transfer Density with Continuous Helical Fin Wrapping

The Spiral Finned Tube Air Preheater is a high heat transfer density flue gas recovery component fabricated by Boyu Heavy Industry using our spiral finned tube manufacturing and tube bundle fabrication capabilities, designed for applications requiring maximum heat recovery in minimal space. As a boiler component manufacturer with in-house spiral fin welding production lines, Boyu produces spiral finned tube air preheaters that deliver the highest external heat transfer area per unit length among extended surface tube designs. This assembly serves the primary function of recovering flue gas waste heat through continuous helical fin tubes, preheating combustion air with exceptional heat transfer density. As boiler plants increasingly optimize space and seek maximum energy recovery, the spiral finned tube air preheater has become a preferred solution for high-density heat transfer applications.

The Spiral Finned Tube Air Preheater is specifically constructed with carbon steel base tubes (Q235/SA-179 or 20G/SA-210) wrapped with a continuous helical steel fin strip welded along the entire tube length. Unlike H-fins which are discrete plates, the spiral fin is a single continuous strip wound around the tube at a precise pitch, creating a uniform, dense extended surface. Boyu welds the spiral fin using high-frequency resistance welding, ensuring full metallurgical bond between fin edge and tube with zero gap. Standard fin heights range from 12-30mm, fin thickness 1.5-3mm, and fin pitch 3-10 fins per 25mm, providing 4-8 times the external heat transfer area of bare tubes - the highest among common extended surface designs.

Manufactured using certified base tubes with in-house spiral fin welding, precision tube sheet drilling, tube expanding and seal welding, every Spiral Finned Tube Air Preheater undergoes fin weld quality inspection, fin pitch and height verification, and comprehensive leak testing. The continuous spiral fin welding process produces consistent, full-penetration welds along the entire tube length with bond strength exceeding 80MPa. Boyu's spiral fin production line enables high-volume manufacturing with consistent quality and competitive lead times, with typical delivery of 30-45 days for complete assemblies. Complete fin quality reports, material certificates and leak test records accompany every shipment.

One significant advantage of Boyu Spiral Finned Tube Air Preheaters is the highest heat transfer density achieved through continuous helical fin geometry. The spiral fin provides 4-8 times the external heat transfer area of bare tubes, enabling the most compact air preheater design for a given heat duty. This is particularly valuable for installations where floor space is at a premium and for retrofit projects upgrading existing bare tube or H-fin air preheaters to higher capacity. Additionally, the continuous spiral fin provides uniform heat distribution along the tube length, eliminating hot spots and improving overall thermal efficiency. The smooth helical surface also facilitates effective cleaning with steam soot blowers in clean to moderate-dust flue gas applications.

The Spiral Finned Tube Air Preheater is adaptable to various boiler types, capacities and space constraints, making it suitable for power generation, coking, petrochemical, steelmaking, biomass energy and process heating industries. Its versatility enables application in new installations and retrofit projects, with horizontal or vertical flow configurations. Furthermore, the assembly can be customized for specific flue gas conditions, including different fin heights, fin pitches, tube diameters and material configurations, ensuring optimal heat transfer performance and pressure drop for each application. For high-dust applications, fin pitch can be increased to reduce fouling risk.

In addition to functional benefits, the Spiral Finned Tube Air Preheater is designed with durability and maintenance convenience in mind. The high-frequency resistance welded continuous fin provides strong, reliable bonds that withstand thermal cycling without fin detachment. The modular tube bundle design allows for individual section replacement during maintenance. Boyu provides technical support for fin geometry optimization, thermal design calculation, pressure drop analysis and fouling assessment, helping clients achieve the optimal balance between maximum heat transfer density and long-term operational reliability.

To summarize, the Boyu Spiral Finned Tube Air Preheater represents the highest-density heat recovery solution leveraging our in-house spiral fin welding expertise. By delivering continuous helical fin tube bundles with verified weld quality and leak-tested construction, it achieves 4-8x heat transfer area, minimizes footprint and delivers exceptional thermal performance in space-constrained applications. Our integrated manufacturing capability, systematic fin design optimization and expert technical support make this product an ideal choice for boiler operators seeking maximum heat recovery in minimal space. Investing in spiral finned tube air preheaters is a strategic decision that supports space optimization, energy efficiency and long-term operational reliability.

Features

·        Boyu in-house spiral fin welding: continuous helical strip, high-frequency resistance welding

·        Continuous spiral fin: 4-8x external heat transfer area vs bare tube (highest density)

·        Fin height 12-30mm, fin thickness 1.5-3mm, fin pitch 3-10 fins/25mm

·        Full metallurgical bond along entire tube length, bond strength >80MPa

·        Uniform heat distribution, eliminates hot spots, improves thermal efficiency

·        Most compact APH design for given heat duty

·        Base tube: Q235(SA-179) / 20G(SA-210), OD 25-51mm

·        Smooth helical surface facilitates steam soot blowing in clean/moderate dust

·        Adjustable fin pitch for high-dust applications to reduce fouling

·        Expert support for fin optimization, thermal design and fouling assessment

Technical Parameters

Applications

The Boyu Spiral Finned Tube Air Preheater is a high-density heat recovery component fabricated using our in-house spiral fin welding capabilities. Manufactured in Shandong, China, this assembly is designed for applications requiring maximum heat recovery in minimal space. Certified with ISO9001, ASME, Grade A and SGS, the product guarantees high quality and reliable heat transfer performance.

This Spiral Finned Tube Air Preheater is widely used in power station boilers, industrial boilers, coking waste heat boilers, biomass boilers, process heaters and retrofit projects where maximum heat transfer density and compact footprint are required. Its continuous helical fin design delivers 4-8x heat transfer area, achieving the most compact air preheater configuration for a given heat duty.