Research on integrated application of deep level energy-saving technology for supercritical 600MW steam turbine

Due to some design defects, the economic indicators of the early 600MW units put into operation did not meet the design guarantee values under actual operating conditions. Taking an supercritical 600MW steam turbine produced by shanghai steam turbine company as an example, We have implemented technical improvements in the flow passage of the steam turbine by replacing the internal cylinders, bearings, sealing components, and other components of the high, medium, and low pressure cylinder bodies of the original steam turbine. The number of high-pressure flow passages has increased from I+11 to I+13, the number of intermediate pressure flow passages has increased from 8 to 9, and the number of low-pressure flow passages has increased from 2×2×7 increased to 2×2×9. After improvement, the heat consumption rate of the unit can be significantly reduced. The performance test results of the steam turbine after technical improvement show that the efficiency of the high-pressure cylinder has increased by 3.85 percentage points, the efficiency of the intermediate pressure cylinder has increased by 2.78 percentage points, and the efficiency of the low-pressure cylinder has increased by 4.79 percentage points. The heat consumption rate of the unit at THA has decreased by 307.3 kJ/(kW · h), equivalent to a reduction of 11.5 g/(kW · h) in coal consumption. The research results can provide technical reference for energy-saving management and energy-saving reconstruction of large-scale thermal power units.