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The difference between superheaters and reheaters
Release time:
2025/11/29
The superheater and the reheater are two key heated surfaces in a boiler, with the following main differences:
I. Functional Positioning
Superheater: Heats the saturated steam generated by the steam drum into superheated steam, increasing the steam enthalpy and directly improving power generation efficiency while protecting turbine blades.
Reheater: It re-heats the low-temperature steam discharged from the high-pressure cylinder of the steam turbine, reducing steam humidity and recovering energy, thereby increasing cycle efficiency by 4% to 5%.
II. Working Conditions
Pressure and Temperature: The steam pressure in the superheater is high (reaching tens of megapascals), and the temperature is even higher (exceeding 600°C in supercritical units); in contrast, the steam pressure in the reheater is lower (20% of the main steam pressure), and the temperature is 10–20°C lower.
Material requirements: The superheater must be resistant to high temperatures and pressures (e.g., SA-213 T91 steel); the reheater should prioritize corrosion resistance (e.g., SA-213 T22 steel).
3. Installation Location
Superheater: Located in the high-temperature zone at the furnace outlet or in the horizontal flue gas duct.
Reheater: Located in the convective flue gas duct where the flue gas temperature is relatively low, to prevent overheating.
IV. Structural Design
Superheater: Vertically arranged in a standing configuration, with a dense tube bundle to enhance heat transfer.
Reheater: Horizontally arranged, with a large tube bundle spacing; pressure drop must be strictly controlled within 0.3 MPa.
V. System Impact
The superheater boosts the initial energy of the steam, while the reheater optimizes the efficiency of the intermediate- and low-pressure cylinders. Together, these two components can increase the system’s thermal efficiency by 4% to 6%.
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