Computation Investigation of the Thermal and Stress-Strain Behavior of the Rotor of High Pressure Turbine Т-100/120-130; block No 1 Operated by the PJSC "Kharkiv CHPP-5 ; Numerical research of thermal and stress-strain state of high-pressure rotor of turbine type t-100/120-130 of 1st power unit «Kharkiv CHPP-5»

Abstract

A Directive of the European Union on the cogeneration development to reach a level of 10 % of the total electric power output defines the development of centralized heat supply to large cities by establishing priorities. A mathematical model of thermal and stress-strain behavior was developed for the steam turbines of a Т-100/120-130 type taking into consideration the available damages of designed structures and restoration and repair changes in elements during their operation. The model is based on 3D spatial analogous models used for high pressure rotor. The data of computation investigation include the calculations of thermal and stress-strain behavior of the high pressure rotor of steam turbine Т-100/120-130 of 100 MW; block No 1 operated by the PJSC "Kharkiv CHPP-5". The stress-strain behavior was created during the numerical experiment simulating the influence of high temperatures, working medium pressures, centrifugal forces and also a reaction of supports. The analysis of obtained data allowed us to determine maximally loaded rotor zones for each start mode of the operation, in particular the cold start, warm and hot starts. The values of maximum amplitudes of the stress intensities for the most loaded rotor sections were determined that allowed for the evaluation of low cycle fatigue and the residual resource of the main metal of turbine. ; Preferred direction of development of district heating in large cities, according to the European Union directive, is the development of cogeneration to 10% of the total production of electric energy. For steam turbines type T‑100/120-130 developed a mathematical model of thermal and stress-strain state on the basis of 3D-dimensional analogues for the high pressure rotor, taking into account existing damage to the project design and repair or any changes of elements in the operation. The results of research include calculation of the thermal and stress-strain state of the high pressure rotor of steam turbine type T-100/120-130 of first power unit OJSC "Kharkiv CHPP-5". In the process of analyzing the results it was determined maximum loaded area of the rotor at each start-up operating modes: starting from cold, still hot from previous and hot conditions. Values of the maximum amplitude of the stress intensity were established for the most loaded sections of the rotor, they are allow to estimate the low-cycle fatigue and residual service life-time of the main metal of the turbine.