METHOD FOR RESUMING FUEL SUPPLY WHILE PREVENTING DEVIATION OF THE PARAMETERS OF THE POWER TURBINE OF A TURBOMACHINE UNIT IN CASE OF A SUDDEN FULL OR PARTIAL LOAD RELEASE Russian patent published in 2023 - IPC F02C9/46 

FIELD: mechanical engineering.

SUBSTANCE: invention relates to the field of protection of turbomachine units, including gas turbine installations (gas turbines and machines driven by them, for example, generators), from dangerous overspeed in case of sudden full or partial load release. In the method for resuming fuel supply in order to prevent deviation of the parameters of the power turbine of the turbomachine unit in case of a sudden full or partial load release, including the supply of signals about the values of the rotational speed of the rotor of the power turbine (n_pt), the rotational speed of the rotor of the gas generator (n_gg) and one of the load parameters, as well as the formation of a signal to control fuel consumption in the combustion chamber, the value of the thermodynamic parameter of the gas generator is also determined, compared with the corresponding threshold value, and when a signal is received simultaneously that the parameter value exceeds its threshold value and a signal about a sudden full or partial load release, commands are given to turn off the fuel supply to the combustion chamber and to turn on the ignition for a specified period of time, and the value of the n_gg is also additionally compared with the corresponding threshold value of the n_gg^threshold and the value of the n_pt with the corresponding threshold value of the n_pt^threshold, the first derivative of the rotation frequency of the rotor of the power turbine by the time of _pt is determined, its value is compared with the corresponding threshold value of _pt^threshold, and also the value of the increment of the rotor speed Δn_pt is determined after the load is released, and further, if n_pt< n_pt^threshopd; |_pt| < _pt^threshold, Δn_pt<0 and n_ptr>n_pt^threshold, a signal is given to turn on the fuel supply to the combustion chamber, additionally to ensure the transition to fuel supply to the combustion chamber according to the standard laws of regulation when resuming fuel supply while preventing a deviation of the parameters of the power turbine of the turbomachine unit in case of sudden full or partial load release, for the determination of the ignition of the combustion chamber and the beginning of an increase in the fuel supply to the CC, the value of the temperature increment behind the turbine is determined, ΔTt, after the signal is given to turn on the combustion chamber fuel supply, it is compared with the threshold value of ΔTt^threshold, the first derivative of the rotation speed of the gas generator rotor is also calculated by the time of _gg , it is compared with the threshold value of _gg^threshold1 and when the conditions (ΔTt > ΔTt^threshold) or (_gg > _gg^threshold1) are met, a sign of ignition of the combustion chamber is formed and an increase in fuel supply to the CC begins with a predetermined dGt/dt rate, while the first derivative of the rotation frequency of the rotor of the gas generator in time _gg , it is compared with the threshold value of _gg^threshold2 and when the conditions (_gg > _gg^threshold2 ) are met, the transition to controlling fuel supply to the combustion chamber is performed according to the standard regulatory laws.

EFFECT: invention makes it possible to increase the safety of the operation of the turbomachine unit and to ensure the reliability of the ignition of the combustion chamber and the shockless transition from ignition to fuel consumption control according to the standard laws of regulation, which makes it possible to increase the reliability of the turbomachine unit as a whole.

1 cl, 1 dwg