Determination of the Thermal and Stress-Strain State of the Medium-Pressure Rotor of the T-100/120-130 Turbine after Damage to the Blades

Abstract

In the period of shelling of energy facilities of Ukraine by the enemy, emergency damage to the working blades of the rotors and stators of the turbines occurs. Papers related to the determination of the thermal and stress-strain states of power equipment elements, which have a significant impact in the conditions of the CHPP operation after its damage, are quite relevant. The authors determine the thermal and stress-strain states that occur after damage to the medium-pressure rotor (MPR) of the T-100/120-130 power unit of the CHPP under emergency damage conditions. When calculating the thermal and stress-strain states of the MPR, taking into account the technical audit data on damage, a geometric model of the MPR was created, which takes into account all existing emergency damage and changes in the frame compared to the design one. When starting from the cold state of the T-100/120-130 turbine MPR, the maximum intensities of conditional elastic stresses at the moment of time of 16800 s in the zone of the seal groove behind the third non-regulated stage of the MPR are equal to σі=127 MPa, and in the zone of the axial opening – σі=125 MPa. The maximum intensities of conditional elastic stresses at the moment of time of 18000 s in the zone of the seal groove behind the third non-regulated stage of MPR are equal to σі=123 MPa, and in the zone of the axial hole – σі=125 MPa when starting from an uncooled state. The maximum intensities of conditional elastic stresses during start-ups from the hot state of the T-100/120-130 turbine MPR at the moment of time of 6400 s (3000 rpm) in the zone of the first unregulated stage in the seal groove according to the MPR stage are equal to σі=201 MPa, and in zone of the axial opening they are equal to σі=161 MPa. The intensities of conditional elastic stresses at the moment of time of 7000 s (3000 rpm) in the zone of the first unregulated stage in the seal groove according to the degree of MPR σі=168 MPa and in the zone of the axial hole σі=161 MPa also are significant.