Super Heater Coils

About Super Heater Coils

Superheater Coils for Boilers

Superheater coils are critical components in steam boilers used to increase the temperature of saturated steam without raising its pressure. They are typically installed in the hottest part of the flue gas path to absorb maximum heat and turn saturated steam into superheated steam.

What Are Superheater Coils?

Superheater coils are high-temperature heat exchangers made of specially designed tubes that carry saturated steam from the boiler drum. These coils are heated by combustion gases to produce superheated steam, which is ideal for driving turbines in power plants or for industrial processes.

Purpose:

• Increases thermal efficiency

• Produces dry, high-energy steam

• Prevents turbine blade erosion (from wet steam)

• Improves cycle efficiency in power generation (Rankine cycle)

Types of Superheaters:

1. Radiant Superheaters:

   • Located directly in the furnace zone

   • Exposed to radiant heat

   • Higher heat flux, risk of overheating

2. Convection Superheaters:

   • Located in the flue gas path

   • Heated by convection

   • Lower heat flux, more stable operation

3. Pendant and Horizontal Superheaters:

• Orientation based on boiler design

• Pendant: hanging vertically

• Horizontal: laid out in rows above the furnace or convective path

Materials Used:

Because they operate at very high temperatures and pressures, superheater coils are made from high-alloy steels:

• T11 / T22 (1.25Cr-0.5Mo / 2.25Cr-1Mo) for medium temps

• TP304 / TP316 (Stainless Steels) for higher corrosion resistance

• Inconel or other high-nickel alloys for extreme cases

Inspection & Maintenance:

• Visual inspection for bulging or cracks

• Ultrasonic thickness testing

• Temperature monitoring

• Boiler water treatment to prevent scaling

• Steam flow checks to avoid starvation

Applications:

• Thermal power plants

• Industrial boilers (refineries, paper mills, chemical plants)

• Marine boilers

• Heat recovery systems

Key Design Considerations:

• Steam pressure & temperature

• Flue gas temperature

• Steam flow rate

• Material selection

• Tube size & coil geometry

Precision Manufacturing & Material Range

Super Heater Coils are crafted with meticulous attention to material selection and dimensional accuracy. Available in carbon steel, alloy steel (such as SA213 T22 and T91), and premium-grade stainless steels, these coils can be seamlessly or welded to meet specific application requirements. Their manufacturing is guided by global standards, ensuring reliability and adaptability in high-temperature industrial operations.


Engineered for Demanding Environments

Designed to withstand pressures up to 150 kg/cm2 and temperatures reaching 650C, Super Heater Coils excel in rigorous operational settings. Their robust resistance to corrosion and high weldability contribute to consistent performance in boilers, heat exchangers, and power generation facilities, enhancing operational efficiency over long service lifespans.


Customizable Design & Versatile Applications

With options for coil type (finned/plain/radiant) and tailored dimensions (diameter, thickness, length), Super Heater Coils provide versatility for diverse industries, from power plants and petrochemicals to manufacturing. Their solid, metallic form and proven material grades ensure effective heat transfer, supported by protective storage and easy integration into existing systems.