In the first time start-up process of complete set 600 MW direct air-cooled unit in Inner Mongolian Jinglong Power Generation Co Ltd

over-sized deviation of water-level appeared in hot-wells at A and B side of the air-cooled condenser

and over-sized deviation of steam pressure occurred in two exhaust steam pipes

leading to trip of the condensate pump

making the unit unable in normal operation

and being forced to shutdown.It is believed from analysis that the main cause leading to said troubles is the pressure difference resulted from flashing and pressure-reducing of two times during the time of drain entering into the drain flash tanks at A and B side is different

and disposal measures

such as adding balance pipe in upper part of A and B hot-well etc.

have been put forward.After implementain

the water-level in two said hot-wells is normal.