Method For Reducing Tension In Tube Walls Of A Steam Generator
Patent No. EP2584053 (titled "Method For Reducing Tension In Tube Walls Of A Steam Generator") was filed by Alstom Technology on Sep 24, 2012. The application was issued on Jul 24, 2019.
Patent Summary
This method provides stress-relief annealing for erected, welded, large-area tube wall regions or segments of a fossil-fired power plant steam generator while installed surrounding the combustion chamber. Treatment is achieved by heating the components over a large area using a hot flowing heat transfer medium, such as hot flue gas, air, or gas generated via fossil fuel combustion within the chamber or introduced externally. Material temperatures are maintained between 400°C and 740°C (preferably 500°C–600°C) for a holding time of $\ge$12 hours (typically 24 hours to one week). Temperature and expansion are regulated via firing rates and internal cooling media (e.g., air). Adjacent non-treated regions are cooled externally or internally to remain below annealing temperatures. The process is particularly applicable to T23/T24 steels and superheaters.
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Date
Description
EP2584053
- Application Number
- EP12185628A
- Filing Date
- Sep 24, 2012
- Status
- Revoked
- Jan 14, 2022
- Publication Date
- Jul 24, 2019
- External Links
- Slate, Register , Google Patents