Taking ultra-supercritical once-through boiler of 1000 MW unit in Huadian Zhouxian Power Plant as an example

the strategy of water-level control in boiler with start-up system having internally positioned steam-water separater for allocated boiler-water circulating pump has been presented and analysed.The water-level control in water storage tank of the separator is similar to that in boiler drum

but the process is more complicated

thus

an approach to the technical features of thermal power control for ultra-supercritical units has been carried out.