Analysis and study have been performed

it is considered that the main cause leading to continuously lower temperature of the main steam from boiler No.5 at Thermal Power Branch Plant under China Aluminium Shanxi Company was due to heat surface fouling and saturated steam containing water

being hard to be thoroughly solved only via operational adjustment of combustion. After inspection during boiler stoppage

the uniformly flow-distributing device of the failured water separator has been restored

and the fouling on every section of heat surface being cleared away

making the steam parameter returned to the normal value.