Abstract: The full process automatic control scheme of cooling island of 2×600MW direct aircooled unit in Huaneng Tongchuan Power Plant was introduced. The existed problems were analyzed, and the control system was optimized. The optimized air cooling system obtained favorable energysaving effects and provides reference for optimization of similar units.

Key words: direct air-cooled unit, air cooling island, full process automatic control, automatic back pressure adjustment, antifreezing protection