Thermal and Corrosion Monitoring Systems
A third scanner system was successfully commissioned in July at Yeungheung power plant, South Korea. The plant feeds power directly into Seoul and the surrounding area, it has six power generation units with a total generation capacity of around 5000 megawatts. Scanner systems are now installed on Units 3, 4 and 6; each system monitors corrosion and/or heat flux on all four tube membrane walls. The latest scanner comprises 236 sensor locations.
Drax power station, UK, has recently decided to completely replace the original corrosion scanner system on its Unit 1 boiler. The original system has been continuously monitoring the fireside corrosion of the tube membrane sidewalls since 2001. The replacement system, comprising 165 sensor locations, brings the monitoring hardware up-to-date and will provide at least another ten years of continuous on-line monitoring on this unit. Five air-cooled VTER corrosion probes are integrated into this system design and monitor the corrosion of the superheater and reheater tubing. Commissioning of this system is due to be completed in the Autumn.