combined with successful experiences of boiler hadn't tripped during 50% and 100% load rejection tests of supercritical 600 MW unit no.1 in Datang Binchang Power Plant

the difficult points of control from boiler side in load rejection test of supercritical units have been analysed

and some measures being put forward to decrease the drop magnitude of steam temperature

including suitably using the bypass system and PCV valve

rapidly decreasing the feed of fuel coal

as well as the evaporation capacity produced by residual heat of boiler

and the steam pressure;rapidly stratup the circulatory pump of boiler water

establishing the reasonable make-up water supplying mode for the boiler

maintaining the minimum flow rate of feed-water into the once-through boiler;using automatic control and timely manual adjustment mode to control all combustion parameters

make them to be stabilized;preventing water enters into the superheater due to too high water-level in the separator

and timely closing the electrically operated valve for desuperheating water etc.

so as to decrease the risk in load rejection test.