Due to the iteration of steam turbine flow technology updates and the demand for extending the lifespan and improving efficiency of nuclear power plants,an overall flow retrofit after operating for 20-30 years of nuclear power turbines need to beconsidered.As for two million-kilowatts-class nuclear turbine which is put into operating by a nuclear group in 2003,the output was unable to reach the design value before retrofit.By studying the matching relationship between the flow area of the turbine partition and the reactor,taking into account the overhaul period and cost factors,the retrofit was carried out to replace the first stage partition of the front/rear flow passage and the third stage partition of the rear flow passage.After the retrofit,the output of the two steam turbines was increased by 10.02MW/6.98MW respectively.As for two million-kilowatts-class nuclear turbine which is put into operating by the above-mentioned nuclear group in 1994,they reveal problems of rivet head erosion and falling off,large static blade friction resistance and disturbance loss,and large residual speed loss of low pressure cylinder after long-term operation.The retrofit was carried out to replacethe flow passage components such as the high-pressure cylinder rotor and partition.After the retrofit,the output of the two steam turbines was increased by 8.8MW/8.6MW respectively.
NETL
NSTL
万方数据
