In the fast start-up for combined cycle power plants, the thermal stress of the steam turbine rotor is generally controlled by the steam temperature or flow rate by use of gas turbines, steam turbines and desuperheaters in order to avoid exceeding the thermal stress limit. However, this thermal stress sensitivity to steam temperature and flow rate depends on the start-up sequence due to the relatively large time constants of the heat transfer response in plant components. In this paper, a coordinated control method of gas turbines and steam turbine is proposed for thermal stress control, which takes into account the large time constants of the heat transfer response. The start-up process was simulated in order to assess the effect of the coordinated control method. The simulation results show that the thermal stresses were stably controlled without exceeding the limits for re-start simulations after several different cool-down times. In addition, they also show the steam turbine start-up times using the proposed control were reduced up to 28% compared with the times when using only steam turbine control.
Coordinated Control of Gas and Steam Turbines for Efficient First Start-up of Combined Cycle Power Plants
2016
Article (Journal)
English
Departments - STEAM TURBINES - New GE Steam Turbines for Combined-Cycle Plants
Online Contents | 2000
Industrial Steam Turbines For Combined-Cycle Plants
Online Contents | 1997
Wet-steam turbines for nuclear power plants
TIBKAT | 2005
|Standardized Combined-Cycle Plants Based On MS6001B Gas Turbines
Online Contents | 1993