Abstract:

In order to enhance the deep peak-regulating capacity of ultra-supercritical thermal power units and solve the problem of large capacity units with low efficiency at low load section, the 1 000 MW unit with high efficiency and wide regulation load demonstration project was put forward and constructed. The burner and water wall of the boiler and steam turbine parameters were applied to the optimization design. The model and operation mode of water supply pumps, condensate pumps, circulating pumps and other auxiliary equipment were optimized. By adding a supplementary steam valve, an external cooler, No.0 high pressure heater, low temperature economizer and other equipment, the unit still maintain a relatively high efficiency in a wide range of target load. The thermal calculation results show that the efficiency of the demonstration unit is 3% higher than the existing unit at 50% load, and the operation flexibility of the demonstration unit has been significantly enhanced, which has made obvious economic and social benefits. The related experience has a reference value for the subsequent similar units to enhance their flexibility.

Key words: high efficiency, wide regulation load, unit peak-regulating, flexibility, optimization integration