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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.

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.

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.

The experience of Denmark, Finland and Russia shows that up to 90 % of the urban demand in heat and electricity can be provided in a joint cycle of their production. The European Union adopted a directive about the development of co-generation to a level of 10% of total electricity generation. From the point of view of the energy business there is valuable in big cities the presence of the combined networks of consumers who use both electricity and heat. Cogeneration systems of most Ukrainian cities are characterized by a high degree of deterioration of thermal power station and thermal networks. The heat consumption of the population is also reduced because of high tariffs for thermal energy. Main economic problems CHP manifested during reducing of the heat load and the corresponding increase in the cost of electricity. In terms of environmental safety of urban district heating it is advantageous. Therefore, the extension of exploitation of the heat power stations is actual and requires special studies. The geometric model of the high pressure rotor, based on visual inspection dates during the repair works, is building. To optimize the calculations in the model there were selected the regulating stage and the first four non-regulated stages of the high pressure rotor, where the metal temperature is high and we have the maximum temperature gradients in the starting regimes. The boundary conditions during the starting from the cold, non-hot and hot states were calculated. When calculating the boundary conditions the changes of the working parameters are were taken into account. ; The experience of Denmark, Finland and Russia shows that up to 90 % of the urban demand in heat and electricity can be provided in a joint cycle of their production. The European Union adopted a directive about the development of co-generation to a level of 10% of total electricity generation. From the point of view of the energy business there is valuable in big cities the presence of the combined networks of consumers who use both electricity and heat. Cogeneration systems of most Ukrainian cities are characterized by a high degree of deterioration of thermal power station and thermal networks. The heat consumption of the population is also reduced because of high tariffs for thermal energy. Main economic problems CHP manifested during reducing of the heat load and the corresponding increase in the cost of electricity. In terms of environmental safety of urban district heating it is advantageous. Therefore, the extension of exploitation of the heat power stations is actual and requires special studies. The geometric model of the high pressure rotor, based on visual inspection dates during the repair works, is building. To optimize the calculations in the model there were selected the regulating stage and the first four non-regulated stages of the high pressure rotor, where the metal temperature is high and we have the maximum temperature gradients in the starting regimes. The boundary conditions during the starting from the cold, non-hot and hot states were calculated. When calculating the boundary conditions the changes of the working parameters are were taken into account.

The experience of Denmark, Finland and Russia shows that up to 90 % of the urban demand in heat and electricity can be provided in a joint cycle of their production. The European Union adopted a directive about the development of co-generation to a level of 10% of total electricity generation. From the point of view of the energy business there is valuable in big cities the presence of the combined networks of consumers who use both electricity and heat. Cogeneration systems of most Ukrainian cities are characterized by a high degree of deterioration of thermal power station and thermal networks. The heat consumption of the population is also reduced because of high tariffs for thermal energy. Main economic problems CHP manifested during reducing of the heat load and the corresponding increase in the cost of electricity. In terms of environmental safety of urban district heating it is advantageous. Therefore, the extension of exploitation of the heat power stations is actual and requires special studies. The geometric model of the high pressure rotor, based on visual inspection dates during the repair works, is building. To optimize the calculations in the model there were selected the regulating stage and the first four non-regulated stages of the high pressure rotor, where the metal temperature is high and we have the maximum temperature gradients in the starting regimes. The boundary conditions during the starting from the cold, non-hot and hot states were calculated. When calculating the boundary conditions the changes of the working parameters are were taken into account. ; The experience of Denmark, Finland and Russia shows that up to 90 % of the urban demand in heat and electricity can be provided in a joint cycle of their production. The European Union adopted a directive about the development of co-generation to a level of 10% of total electricity generation. From the point of view of the energy business there is valuable in big cities the presence of the combined networks of consumers who use both electricity and heat. Cogeneration systems of most Ukrainian cities are characterized by a high degree of deterioration of thermal power station and thermal networks. The heat consumption of the population is also reduced because of high tariffs for thermal energy. Main economic problems CHP manifested during reducing of the heat load and the corresponding increase in the cost of electricity. In terms of environmental safety of urban district heating it is advantageous. Therefore, the extension of exploitation of the heat power stations is actual and requires special studies. The geometric model of the high pressure rotor, based on visual inspection dates during the repair works, is building. To optimize the calculations in the model there were selected the regulating stage and the first four non-regulated stages of the high pressure rotor, where the metal temperature is high and we have the maximum temperature gradients in the starting regimes. The boundary conditions during the starting from the cold, non-hot and hot states were calculated. When calculating the boundary conditions the changes of the working parameters are were taken into account.

The experience of Denmark, Finland and Russia shows that up to 90 % of the urban demand in heat and electricity can be provided in a joint cycle of their production. The European Union adopted a directive about the development of co-generation to a level of 10% of total electricity generation. From the point of view of the energy business there is valuable in big cities the presence of the combined networks of consumers who use both electricity and heat. Cogeneration systems of most Ukrainian cities are characterized by a high degree of deterioration of thermal power station and thermal networks. The heat consumption of the population is also reduced because of high tariffs for thermal energy. Main economic problems CHP manifested during reducing of the heat load and the corresponding increase in the cost of electricity. In terms of environmental safety of urban district heating it is advantageous. Therefore, the extension of exploitation of the heat power stations is actual and requires special studies. The geometric model of the high pressure rotor, based on visual inspection dates during the repair works, is building. To optimize the calculations in the model there were selected the regulating stage and the first four non-regulated stages of the high pressure rotor, where the metal temperature is high and we have the maximum temperature gradients in the starting regimes. The boundary conditions during the starting from the cold, non-hot and hot states were calculated. When calculating the boundary conditions the changes of the working parameters are were taken into account. ; The experience of Denmark, Finland and Russia shows that up to 90 % of the urban demand in heat and electricity can be provided in a joint cycle of their production. The European Union adopted a directive about the development of co-generation to a level of 10% of total electricity generation. From the point of view of the energy business there is valuable in big cities the presence of the combined networks of consumers who use both electricity and heat. Cogeneration systems of most Ukrainian cities are characterized by a high degree of deterioration of thermal power station and thermal networks. The heat consumption of the population is also reduced because of high tariffs for thermal energy. Main economic problems CHP manifested during reducing of the heat load and the corresponding increase in the cost of electricity. In terms of environmental safety of urban district heating it is advantageous. Therefore, the extension of exploitation of the heat power stations is actual and requires special studies. The geometric model of the high pressure rotor, based on visual inspection dates during the repair works, is building. To optimize the calculations in the model there were selected the regulating stage and the first four non-regulated stages of the high pressure rotor, where the metal temperature is high and we have the maximum temperature gradients in the starting regimes. The boundary conditions during the starting from the cold, non-hot and hot states were calculated. When calculating the boundary conditions the changes of the working parameters are were taken into account.