Design Forecasting of Thermal Strength and Resource of Steam Turbine structural Components
Journal Title: Проблеми машинобудування - Year 2018, Vol 21, Issue 3
Abstract
Effective and reliable operation of power units is closely connected with the provision of the thermal strength and durability of their elements and components. The needs of the modern energy market lead to the operation of equipment in variable modes, which causes accelerated wear-out of its resource. The problem of extending the resource of power equipment is becoming increasingly important due to the fact that its ageing processes outstrip its replacement rate. Therefore, in order to ensure the reliable operation of power units, a calculated estimate of the thermal stability and durability of their elements is essential, based on the application of new methods and calculation models, taking into account a number of important factors (damageability, material property heterogeneity, contact interactions, presence of cracks, influence of non-stationary temperature fields, etc.) The paper gives an overview of methodical and software as well as the results of the calculated research of the thermal strength, resource and crack resistance of steam turbine elements, which have been performed at A. Podgorny Institute of Mechanical Engineering Problems of the National Academy of Sciences of Ukraine during the last 15 years. The calculated estimate of the resource of power unit parts and components, as well as substantiation of the possibility of its extension were performed within the framework of the normative document developed by the authors of this paper for determining the estimated resource and survivability of rotors and turbine structural units with more reasonable reserve coefficients. The developed methodical ware allowed us to make calculations of steam turbine elements in newly specified formulations, taking into account the peculiarities of real operating conditions. The developed computerized system for diagnosing the thermal-stress state and wear-out of high-temperature steam turbine rotor resources, taking into account the real operating modes of turbine units, obtained on the basis of the parameters of the automatic control system of technological processes, allows one to more accurately estimate the time of their trouble-free operation. Formulations and a brief analysis of the results of the considered problems of thermal strength and resource of turbine elements are presented.
Authors and Affiliations
Nikolay Shulzhenko, Pavel Gontarovskiy, Nataliya Garmash, Irina Melezhik
Keywords
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- EP ID EP622088
- DOI 10.15407/pmach2018.03.038
- Views 68
- Downloads 0
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