Research on Instrument and Control Design and Control Strategy for Small Steam Turbine in Double-Turbine Regeneration System

  Introduction  The double-turbine regeneration system can improve the energy efficiency of the unit. How to design the control strategy and ensure its safety, economy and effectiveness has been the prime focus of our group.

  Method  According to the functional requirements of the double-turbine regeneration system, a corresponding the scheme of instrument arrangement of measuring points was designed, and a complete set of start-up, speed control, system protection and back pressure control strategies were put forward systematically.

  Result  The control strategy has been successfully applied in a 1 000 MW Ultra Super-critical Pressure Unit, the results show that the control strategy can make the double-turbine regeneration system not only meet the feed water speed control, but also meet the requirements of coordinated control of steam extraction, exhaust and overflow, so as to ensure the stable, reliable and economic operation of the system.

  Conclusion  The proposed control strategy has reference significance for further study on control strategy for double-turbine regeneration system.