In this study

an ultra-supercritical 1 000 MW unit of a power generation company is taken as an example to study the layout

control strategy of No.0 high-pressure heater and its influence on the temperature of boiler feed water

heat consumption and the running rate of selective catalyst reduction(SCR) denitration system. The results show that

in the premise of guaranteeing feed water owes enthalpy at the export of economizer under low-load

with the proper control of steam pressure behind the No.0 extraction control valve

the application of the No.0 highpressure heater can increase the temperature of boiler feed water under medium and low loads and stabilize the temperature of boiler feed water at 290 ℃ under medium and high loads. The inlet flue gas temperature at SCR system under medium and low loads can also be increased and kept at the efficient reaction temperature range of the catalyst

which can improve the running rate of the denitration system and have good environmental protection value. Meanwhile

the reasonable No.0 extraction steam parameters could reduce the unit heat consumption under medium and high loads

which has great energy-saving value. This conclusion is of guidance and reference for the application

commercial operation

addition and retrofit of the No.0 high-pressure heater of the same type new units.