Abstract: The new technology of combined fast-cooling down, the real fast-cooling down process and economic performance valuation of the 1 036 MW ultra-supercritical unit in Huaneng Haimen Power Plant were introduced. Through the actual analysis on the depth sliding parameter shutdown technology and the scheme of multi-means combination for turbine fast-cooling down, the fast and safe cooling down of turbine in each stage were achieved, the cooling time of the turbine was greatly reduced, the maintenance time duration was saved, the availability of unit was improved, and its economic and social benefits were significant. The operation idea and recommended rapid cooling down curve for turbine in million-kilowatt unit were summarized and given. The optimization method, procedure and attentions were given, which can provide a reference and application for the depth fast-cooling down in million-kilowatt unit.

Key words: ultra supercritical, turbine, fast-cooling down