Abstract
The report is devoted to the problem of increasing the reliability and manoeuvrability of the CCGT when it operates in power control modes of the power system. The generalized results of research on improving the reliability and expanding the adjustment range of the PGU-450 based on the use of bypass steam distribution, reducing the duration of start-up operations and increasing the loading speed of the steam turbine and CCGT in general in the modes of CCGT power reserve during the night load gap by transferring the CCGT steam turbine to the motor mode when the CCGT operates in the condensation mode or in the heating mode according to the GTU-CHP scheme are presented. Additional advantages of the motor mode are noted: improved reliability of the steam turbine due to the elimination of cyclic temperature fluctuations of its steam inlet valves and vibrations in the last stages of the low-pressure cylinder and the possibility of operating the steam turbine generator in the synchronous compensator mode.
Highlights
In the Russian power industry, the established tradition of designing highly efficient but low-manoeuvrable power units on organic fuel has led to the fact that at all times, including at the present time, the manoeuvrable characteristics of the existing main equipment of thermal power plants do not correspond to the variable nature of the schedules of electric loads of power systems, which creates difficulties in covering the variable part and especially in passing the gaps of the schedules of energy consumption
It becomes obvious that, while maintaining the tendency to increase the share of high-efficiency cycle gas plants (CCGTs) in total capacity of the power system, designed to work with basic graphs of the electric loading without due regard for the requirements of user's manoeuvrability combined-cycle units, in conditions of almost complete lack of input into the power system highly manoeuvrable power plants will lead to the fact that the problems of manoeuvrability for power systems and power plants will be highly topical and will require greater effort to overcome them
When reserving the power of the PGU-450 in the condensing mode, switching the steam turbine to the motor mode reduces the duration of starting operations of the steam turbine and, the CCGT as a whole by 40-45 min., increases the average loading speed of the steam turbine and the CCGT as a whole to 5.0 and 15.0 MW per min. instead of 4.3 and 6.4 MW per minute in the variant of stopping the steam turbine
Summary
In the Russian power industry, the established tradition of designing highly efficient but low-manoeuvrable power units on organic fuel has led to the fact that at all times, including at the present time, the manoeuvrable characteristics of the existing main equipment of thermal power plants do not correspond to the variable nature of the schedules of electric loads of power systems, which creates difficulties in covering the variable part and especially in passing the gaps of the schedules of energy consumption. It becomes obvious that, while maintaining the tendency to increase the share of high-efficiency CCGT in total capacity of the power system, designed to work with basic graphs of the electric loading without due regard for the requirements of user's manoeuvrability combined-cycle units, in conditions of almost complete lack of input into the power system highly manoeuvrable power plants will lead to the fact that the problems of manoeuvrability for power systems and power plants will be highly topical and will require greater effort to overcome them All this shows the urgent need and timeliness of research aimed at developing technical solutions aimed at improving the manoeuvrability characteristics of CCGT equipment, especially in terms of expanding the adjustment range and reducing the duration and increasing the reliability of stop-start modes. In addition to the inevitable loss of heat and fuel at all stages of start-up, the presence of additional losses associated with the discharge of steam from the recovery boiler to the condenser due to the lack of readiness of the steam turbine to receive steam [3]
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