PGE/REWE 2015

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Life Time Extension of Large Thermal CHP Plants (Room G104, Auditorium Centre, First Floor)

Typically technical life times of major thermal (coal fired) power plants are of the order 30 to 40 years, but normally in order to actually obtaining such a long life time a major update of central highly stressed parts after 15 to 20 years is a prerequisite. For a particular plant this paper will describe the background for the decision, the planning and the execution, the challenges met and the results achieved of an extensive lifetime extension project. The plant is a 350 MWe unit with the ability of producing up to 455 MJ/s heat for the district heating network of a major city in Denmark. Since the unit is vital for the DH supply of the city the life time extension was essential for a continued, reliable supply of heat. The life time extension project became the first step in securing the future of the power plant. The unit was commissioned in the 1980’s, and over time updated with co-firing with bio-fuel and DeNOx (SCR). After 185.000 operating hours the owner launched a project with the aim of quantifying the cost of a complete refurbishment of the unit. In this project Ramboll acted as owners engineer and was responsible for: • Technical assessment of the complete plant • CAPEX budget • Planning of execution • Tendering/contracting • Supervision and commissioning • Hand-over and documentation The paper will address the methodology adapted when performing the technical assessment and when choosing which components to ugrade/exchange. Plant components requiring special attention in ageing power plants will be described.