Product Description

An economizer, also known as a boiler economizer or flue gas heat recovery unit, is a heat exchange device installed in the boiler tail flue duct that preheats feedwater before it enters the steam drum, using the residual heat from exhaust flue gases. It typically consists of a series of seamless steel tubes arranged in serpentine or coil configurations, which may be plain bare tubes, finned tubes (spiral or H-type), or gilled tubes depending on the required heat transfer efficiency and fouling conditions. The economizer absorbs sensible heat from hot flue gases, typically at temperatures ranging from 300°C to 500°C, transferring it to the feedwater flowing inside the tubes, thereby raising the water temperature and significantly reducing the exhaust gas temperature leaving the boiler. By recovering this waste heat, the economizer directly contributes to improved boiler thermal efficiency, reduced fuel consumption, and lower operating costs, making it an essential component in both power station boilers and industrial steam systems.

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Application description

Superheaters are widely employed in thermal power plants, industrial cogeneration facilities, and large-scale steam generation systems where high-temperature, high-pressure steam is required for maximum turbine efficiency and process heating. In coal-fired, gas-fired, and oil-fired power stations, superheaters enable higher Rankine cycle efficiencies by delivering steam at temperatures up to 600°C or more, thereby reducing fuel consumption and emissions. They are also essential in circulating fluidized bed boilers, heat recovery steam generators, and biomass power plants, as well as in chemical and petrochemical plants where superheated steam is needed for drying, sterilization, and other thermal processes. The use of superheaters ensures that steam remains dry and free from moisture, which protects downstream equipment from erosion and corrosion, extends turbine blade life, and maintains stable operation across a wide range of load conditions.

Production description

Our superheaters are manufactured under strict quality control procedures using high-grade alloy and carbon steel materials that resist creep, oxidation, and thermal fatigue at elevated temperatures. The production process begins with material verification and tube preparation, followed by precision bending or forming into the required coil or panel geometries. The tubes are then welded to headers and supports using advanced welding techniques such as TIG, MIG, or submerged arc welding, with all weld joints subjected to one hundred percent non-destructive examination, including radiographic testing, penetrant testing, and ultrasonic testing as specified. After welding, the assembled superheater undergoes post-weld heat treatment to relieve residual stresses, followed by a hydraulic pressure test at one and a half times the design pressure to verify leak-tight integrity. Our manufacturing complies with internationally recognized standards such as ASME Section I, ISO 3834, and GB/T 16507, and we tailor each superheater to the customer's specific boiler layout, temperature profile, and pressure requirements.

Shipping Packaging

Each superheater is carefully packaged to withstand the rigors of long-distance transportation and site storage. Depending on the size and configuration, the superheater sections are either bundled on reinforced steel frames or placed in sturdy wooden or metal crates with adequate internal bracing and protective padding to prevent movement and surface damage. All exposed tube ends are sealed with plastic caps to prevent ingress of moisture and foreign particles, and the entire package is wrapped with waterproof and moisture-proof materials, covered with heavy-duty woven fabric, and secured with steel strapping for container or bulk vessel loading. Clear shipping marks, lifting points, and handling instructions are prominently attached to each package, ensuring safe unloading and smooth installation at the destination site.

Why Choose Us?

1.High-grade alloy materials: engineered to withstand temperatures up to 650°C for ultra-supercritical operation.

2.All superheater types available: convective, radiant, platen, and pendant, customized to your boiler layout.

3.Strict quality control: 100% non-destructive testing (RT, PT, UT) and hydrostatic testing on every unit.

4.Proven expertise: extensive experience in superheater manufacturing for power plants, CFB boilers, and HRSG systems.

5.Secure packaging & on-time delivery: export-grade crating with clear lifting and handling instructions.

FAQ

1. Can you customize the superheater to match our existing boiler design and operating conditions?
Yes, we offer full customization including tube diameters, wall thicknesses, material grades, tube arrangement, and header connections. We design based on your specific temperature, pressure, and flue gas conditions, and can supply convective, radiant, platen, or pendant superheaters as required.

2. What materials do you use for high-temperature applications?
We use a wide range of heatresistant materials including alloy steels like 15CrMoG, 12Cr1MoVG, and SA213T12/T22, as well as stainless steels like SA213TP304H, TP347H, and advanced grades such as T91, T92, and TP310H for operation up to 650°C. Material selection is tailored to your design temperature and corrosion requirements.

3. How are superheaters packaged for export, and what is your typical lead time?
Superheater sections are securely bundled on reinforced steel frames or placed in sturdy wooden crates with internal bracing and protective padding. All tube ends are sealed, and the package is wrapped with waterproof materials and steelstrapped for container or bulk vessel shipping. Lead time typically ranges from 45 to 90 days depending on quantity, complexity, and material availability.