Research on Thermal System with Double-deaerator

  Introduction  The paper performs research on thermal system with double-deaerator in order to study the wide load technology of large capccity units.

  Method  By using the comparative study，analyzed the system， plant layout and technique economics.

  Result  The results show that the system is feasible in technology，for 1 000 MW unit，the heat rate of the double-turbine regeneration system with double-deaerator is lower 10 kJ/kWh~50 kJ/kWh than the double-turbine regeneration system with one-deaerator under different loads，saved 7 232 tons of coal per year，investment increased by 5.7 million yuan， the investment recovery period is about 2 years.

  Conclusion  The system is suitable for high parameter units，this work provides some guidance for using the thermal system with double-deaerator in high parameter units.