Steam Coil Boiler Air Preheater Tubular For Combustion Air Preheating

Steam Coil Air Preheater for Combustion Air Preheating with Saturated or Superheated Steam Heating

The Steam Coil Air Preheater is a steam-heated combustion air preheating component fabricated by Boyu Heavy Industry using our pressure component fabrication and coil bending capabilities, designed for applications where flue gas heat recovery alone is insufficient or supplemental air heating is required. As a boiler pressure component manufacturer with ASME S/U certification and extensive coil fabrication experience, Boyu produces steam coil air preheaters that utilize saturated or superheated steam as the heating medium. This assembly serves the primary function of preheating combustion air using steam, ensuring reliable ignition, stable combustion and efficient boiler operation particularly during start-up, low-load operation and cold weather conditions. As boiler operators require flexible air heating solutions for varying operating conditions, the steam coil air preheater has become an essential complementary component.

The Steam Coil Air Preheater is specifically constructed as a finned or bare tube coil assembly with inlet and outlet steam headers, designed for installation in the combustion air duct upstream of the boiler. Steam flows inside the tubes while combustion air flows across the external tube surface, transferring heat through the tube wall. Boyu fabricates the coils from certified seamless carbon steel or alloy steel tubes (20G/SA-210 or 15CrMoG/SA-213 T12 for superheated steam), with optional spiral or H-fins for enhanced air-side heat transfer. The steam headers are fabricated from thick-wall seamless pipe with CNC-drilled tube connections, and all pressure-bearing welds comply with ASME BPVC Section I requirements. Standard steam pressures range from 0.6MPa to 4.0MPa, with steam temperatures from saturated (158C at 0.6MPa) to 350C superheated.

Manufactured using certified pressure component materials with CNC coil bending, automatic tube-to-header welding, post-weld heat treatment (for alloy steel) and comprehensive NDT, every Steam Coil Air Preheater undergoes 100% radiographic testing (RT) of tube-to-header welds, hydraulic pressure testing at 1.5 times design pressure and air-side leak testing. The ASME S/U certified fabrication ensures compliance with international pressure vessel standards. Boyu's 3000-ton monthly production capacity enables competitive lead times, with typical delivery of 25-40 days for complete assemblies. Complete material certificates (MTC per heat), welding procedure records (WPS/PQR), NDT reports and pressure test records accompany every shipment to support third-party inspection.

One significant advantage of Boyu Steam Coil Air Preheaters is the pressure component quality inherited from our boiler pressure parts manufacturing expertise. The tube-to-header joints, steam headers and coil bends are fabricated to the same rigorous standards as boiler superheater and economizer components, ensuring reliable pressure containment and long service life. Additionally, the steam coil design provides precise, responsive temperature control independent of boiler load, making it ideal for start-up heating where flue gas temperatures are too low for effective regenerative heating, and for maintaining minimum combustion air temperature during low-load operation or cold ambient conditions. The finned tube option provides compact design with high heat transfer density.

The Steam Coil Air Preheater is adaptable to various boiler types, capacities and operating conditions, making it suitable for power generation, coking, petrochemical, steelmaking, pulp and paper and food processing industries. Its versatility enables application as a primary air heater for small boilers, a supplemental heater for large boilers, or a start-up air heater for utility units. Furthermore, the assembly can be customized for specific steam conditions, air flow rates, temperature rise requirements and duct dimensions, with bare tube or finned tube configurations selected based on air-side pressure drop and heat transfer requirements.

In addition to functional benefits, the Steam Coil Air Preheater is designed with safety and maintenance convenience in mind. All pressure-bearing components comply with ASME BPVC Section I and GB/T 16507 standards, with mandatory NDT and pressure testing ensuring safe operation. The modular coil design allows for individual coil section replacement during maintenance. Boyu provides technical support for thermal design, steam consumption calculation, pressure drop analysis and material selection, helping clients optimize coil configuration for their specific operating conditions. Proper steam trapping and condensate management are addressed in the design to prevent water hammer and ensure efficient heat transfer.

To summarize, the Boyu Steam Coil Air Preheater represents a reliable steam-heated air preheating solution leveraging our pressure component fabrication expertise. By delivering ASME-certified, NDT-tested coil assemblies with verified pressure integrity and responsive temperature control, it ensures reliable combustion air heating for start-up, low-load and supplemental heating applications. Our ASME S/U certified manufacturing, systematic material selection and expert technical support make this product an ideal choice for boiler operators requiring flexible, high-quality steam air heating solutions. Investing in steam coil air preheaters is a strategic decision that supports combustion stability, operational flexibility and long-term reliability.

Features

·        Boyu ASME S/U pressure component fabrication: coil bending, tube-to-header welding, PWHT

·        100% RT for tube-to-header welds + 1.5x design pressure hydraulic test

·        Steam heating medium: saturated (158C at 0.6MPa) to 350C superheated, 0.6-4.0MPa

·        Tube material: 20G(SA-210) for saturated / 15CrMoG(SA-213 T12) for superheated steam

·        Optional spiral/H-fins for enhanced air-side heat transfer, compact design

·        Precise, responsive temperature control independent of boiler load

·        Ideal for start-up heating, low-load operation and cold weather conditions

·        Modular coil design for individual section replacement

·        Suitable as primary, supplemental or start-up air heater

·        Expert support for thermal design, steam consumption and pressure drop analysis

Technical Parameters

Applications

The Boyu Steam Coil Air Preheater is a steam-heated combustion air preheating component fabricated using our ASME S/U certified pressure component capabilities. Manufactured in Shandong, China, this assembly is designed for applications requiring supplemental or start-up air heating. Certified with ISO9001, ASME S/U, Grade A and SGS, the product guarantees high quality, safety and reliable pressure integrity.

This Steam Coil Air Preheater is widely used in power station boilers, industrial boilers, coking boilers, petrochemical heaters, pulp and paper recovery boilers and food processing boilers where steam-heated air preheating is required for start-up, low-load operation or supplemental heating. Its responsive temperature control ensures stable combustion and reliable boiler operation across varying operating conditions.