Abstract: The once-through boiler start-up system is one of the key techniques of supercritical units. The once-through boiler start-up system and the turbine bypass system are important measures to ensure that the unit start-up, shut-down and operation with low load safely and economically, these are same important for appropriate accident handling too. The start-up and control system of the supercritical once-through boiler were described, which includes the start-up system classification, the features of system configuration, starting process flow and others.

Key words: supercritical once-through boiler, boiler start-up system, system classification, starting process flow