Abstract:

Abstract:In commissioning process of unit No. 4 of Guangdong Yudean Jinghai Power Generation Company Limited, it was found that under high unit load,the vibration of the shafts No. 1 and No. 2 suddenly increased. Considering related vibration parameters, it confirmed that steam flowexcited vibration occurred.In the original valve control logic of the steam turbine DEH system, the main control valve CV4 and the last control valve CV1 were exchanged, so the inlet steam distribution of upper and lower parts of the turbine cylinder was changedand the steam flowexcited vibration was restrained. After adjustment,the vibration of shafts No. 1 and No. 2 is about 40 μm during normal operation, and favorable result was obtained.

Key words:

font-family: E-HZ-PK74810c, color: black">Keywordsfont-family: SSJ-PK74820000002, color: black">: font-family: E-BZ-PK748e5, color: black">ultra supercritical unitfont-family: SSJ-PK74820000002, color: black">, font-family: E-BZ-PK748e5, color: black">steam turbinefont-family: SSJ-PK74820000002, color: black">, font-family: E-BZ-PK748e5, color: black">steam flowfont-family: E-BZ-PK748e5, color: black">excited vibrationfont-family: SSJ-PK74820000002, color: black">, font-family: E-BZ-PK748e5, color: black">control valve