Low Temperature Boiler Carbon Alloy Steel Reheater Reheater Coil

Low-Temperature Reheater Coil for Boiler Reheat Cycle with Carbon/Alloy Steel Construction

The Low-Temperature Reheater Coil is the first-stage reheat steam heating component fabricated by Boyu Heavy Industry, designed for the convective section of utility and large industrial boilers where it reheats steam exhausted from the high-pressure turbine. As a specialized boiler pressure component manufacturer with 3000-ton monthly capacity, Boyu produces low-temperature reheater coils that feature serpentine tube arrangements optimized for reheat steam service. This coil serves the primary function of raising cold reheat steam (typically 300-380C) to intermediate temperature before it enters the high-temperature reheater, improving overall cycle efficiency by reducing turbine exhaust moisture and increasing power output.

The Low-Temperature Reheater Coil is specifically constructed with seamless boiler tubes bent into serpentine loops, connected to inlet and outlet headers. Boyu fabricates coils from certified materials selected by operating temperature: 20G (SA-210) carbon steel for the cold inlet section up to 460C, and 15CrMoG (SA-213 T12) alloy steel for the hotter outlet section 480-520C. A key characteristic of reheater service is the lower steam pressure (1.2-3.8MPa, compared with 9.8-25.4MPa for superheaters), which enables thinner tube walls (3-5mm vs 4-7mm for superheaters), reducing material cost while maintaining adequate pressure containment. Standard tube sizes are 42-63.5mm OD. CNC precision bending ensures ovality <8%.

Manufactured using certified seamless tubes with CNC automatic bending, robotic circumferential welding and comprehensive NDT, every Low-Temperature Reheater Coil undergoes 100% RT for weld joints, bend inspection, dimensional verification and hydraulic pressure testing. Boyu's integrated tube fabrication facility ensures consistent quality. Typical delivery is 25-40 days for complete coil sets. Complete material certificates, welding records and NDT reports accompany every shipment. The modular coil design with pre-welded connectors enables rapid on-site installation. For high-dust applications, anti-abrasion tiles can be added to leading tube rows.

One significant advantage of Boyu Low-Temperature Reheater Coils is the optimized material selection and tube wall thickness for reheat steam service. Unlike superheaters that operate at high pressure requiring thick tube walls, reheaters operate at 1.2-3.8MPa, allowing thinner walls that reduce both material cost and thermal stress. Boyu systematically selects carbon steel for the cold section and alloy steel for the hot section, avoiding unnecessary alloy cost while ensuring adequate high-temperature strength. Additionally, the serpentine configuration provides a large heat transfer area in the convective pass, making it the standard design for low-temperature reheaters in utility boilers.

The Low-Temperature Reheater Coil is adaptable to various utility and large industrial boiler types, making it suitable for power generation, coking waste heat and large industrial steam applications. Its versatility enables fabrication for boiler capacities from 220t/h to 2000t/h and above, with reheat steam parameters from 1.2MPa/300C inlet to 3.8MPa/480C outlet. Furthermore, coils can be customized for specific tube sizes, bend configurations, material transitions and anti-abrasion requirements, ensuring optimal performance for each boiler reheat system.

In addition to functional benefits, the Low-Temperature Reheater Coil is designed with safety and long-term reliability in mind. All materials and fabrication comply with ASME BPVC Section I and GB/T 16507 standards. Post-weld heat treatment is applied to alloy steel sections. Boyu provides technical support for thermal design, material selection, creep life assessment and failure analysis, helping clients optimize reheater configuration. Proper low-temperature reheater design ensures stable reheat steam temperature and protects the high-temperature reheater from thermal shock.

To summarize, the Boyu Low-Temperature Reheater Coil represents a high-quality first-stage reheat heating solution leveraging our CNC bending and welding expertise. By delivering precision-bent, NDT-tested coils with optimized material selection and tube wall thickness for low-pressure reheat service, it ensures reliable reheat steam production and improved cycle efficiency. Our integrated manufacturing capability, rigorous quality control and expert technical support make this product an ideal choice for large boiler manufacturers and EPC contractors.

Features

·        Reheat steam pressure 1.2-3.8MPa, thinner tube walls (3-5mm) vs superheater

·        Systematic material: 20G(SA-210) cold section / 15CrMoG(T12) hot section

·        CNC precision bending, ovality <8%, tube OD 42-63.5mm

·        100% RT weld joints + bend inspection + hydraulic test

·        Serpentine configuration for convective pass heat transfer

·        Anti-abrasion tile option for high-dust applications

·        Modular coil with pre-welded connectors for rapid installation

·        Suitable for 220t/h to 2000t/h+ utility boilers

·        Delivery: 25-40 days, 3000-ton monthly capacity

·        Expert support for creep life assessment and failure analysis

Technical Parameters

Applications

The Boyu Low-Temperature Reheater Coil is the first-stage reheat steam heating component for utility and large industrial boilers. Manufactured in Shandong, China with CNC precision bending, this coil reheats cold reheat steam in the convective section. Certified with ISO9001, ASME, Grade A and SGS, the product guarantees high quality and reliable reheat performance.

This Low-Temperature Reheater Coil is widely used in large utility boilers, coking waste heat boilers and large industrial boilers with reheat cycles. Its optimized material selection and thinner tube walls for low-pressure reheat service ensure cost-effective, reliable first-stage reheat steam heating.