A method for optimizing boiler-turbine coordination to improve the flexibility of supercritical thermal power units

Through the coordination and optimization method of steam turbine and boiler main control, combined with feedback and feedback loops, the problem of low load response rate of supercritical thermal power units is solved, which improves the flexibility and safety of the unit and adapts to new energy fluctuations.

CN116557086BActive Publication Date: 2025-08-12XIAN THERMAL POWER RES INST CO LTD
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Patent Information

Application Number
CN202310536434.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-05-12
Publication Date
2025-08-12
Estimated Expiration
2043-05-12

AI Technical Summary

Technical Problem

When faced with new energy fluctuations, the load response rate of existing supercritical thermal power units is not high. The fluctuations in coal quantity and coal quality affect the safety of the unit operation, resulting in grid stability and economic problems.

Method used

The coordinated optimization method of turbine main control and boiler main control is adopted, including the combination of feedback loop and feedback loop. Through speed limit, intelligent static feedforward and dynamic feedforward control, fuel changes are optimized, combined with coal quality correction and air volume control, and load tracking performance is improved.

Benefits of technology

It realizes rapid response of supercritical thermal power units when load changes, reduces pressure and temperature fluctuations, improves the flexibility and safety of the units, and enhances the ability to adapt to new energy fluctuations.

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Abstract

The present invention discloses a method for optimizing turbine-boiler coordination to enhance the flexibility of a supercritical thermal power unit. The method includes controlling a steam turbine master control and a boiler master control. The boiler master control comprises two parts: a feedback loop and a feedforward loop. The steam turbine master control controls the load of the steam turbine and the steam pressure of the boiler. The boiler master control is automatic, while the steam turbine master control is manual. When the load command changes, the turbine regulator changes the throttle opening, thereby changing the steam intake, so that the generator output power quickly meets the external load requirements. When the external load command changes, the steam flow of the steam turbine master control rapidly changes, which is obtained from the heat storage of the boiler body. This causes large steam pressure fluctuations, allowing the unit to quickly adapt to external load requirements. The present invention improves load tracking capability while also ensuring the safety of the thermal power unit and improving its flexibility.
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Citation Information

Patent Citations

  • Advanced control method for thermal power unit boiler turbine coordination system

    CN101488022A

  • Coordinated control system of thermal power generating unit and coordinated control method of coordinated control system

    CN109491337A