Investigation of the resource indicators of the intermediate pressure rotor of the K-200-130 turbine of power unit No. 11 of DTEK Burshtyn TPP

Abstract

The Burshtyn TPP is separated from the unified energy system of Ukraine, operates as part of the "Burshtynskii Ostriv" in parallel with the Union for the Co-ordination of Transmission of Electricity (UCTE). Work within the "Burshtynskii Ostriv" requires the loading of up to nine power units of the station, whereas before that, no more than six power units worked at the station. On the one hand, joining the UCTE opened opportunities for increasing export supplies of electricity from Ukraine. On the other hand, the maneuvering mode of operation of the power plant in "Burshtynskii Ostriv" has an extremely negative effect on the condition of the equipment, as it leads to frequent start-stops of units. As a result of this regime, the accident rate of TPPs has increased significantly. Therefore, it is important to determine the individual resource of Burshtyn TPP power units and assess the possibility of continuing the operation. According to calculations, the total damage of the metal of the intermediate pressure rotor of the K-200-130 turbine unit of power unit No. 11 of DTEK Burshtyn TPP is 107%, with the coefficients of the safety margin for the number of cycles and for deformations at the level of 5 and 1.5, as well as at the permissible metal working time 370 thousand hours. If the total damage of the rotor metal is more than 100%, then further operation of the equipment is impossible according to regulatory documents and the resource is considered to be exhausted. According to experimental data, with the coefficients of safety margin for the number of cycles and deformations at the level of 3 and 1.25, as well as the allowable working time of the metal of 450 thousand hours, the total damage of the metal of the rotor is 83%. The residual resource of the intermediate pressure rotor of the K-200-130 turbine of power unit No. 11 of DTEK Burshtyn TPP will be 58 908 hours. Thus, with the positive decision of the expert commission in accepting the reduced coefficients of safety margin, the allowable service life of the intermediate pressure rotor of the K-200-130 turbine of power unit No. 11 of DTEK Burshtyn TPP can be extended by 50,000 hours. with additional number of starts of no more than 400.