The analysis of the turbine capacitor К-1000-60/1500-2 for the power unit of 1000 MW at the Zaporizhzhia Nuclear Power Plant for optimization its operation in different modes
Students Name: Zolotarova Kateryna Serhiivna
Qualification Level: magister
Speciality: Nuclear Рower Еngineering
Institute: Institute of Power Engineering and Control Systems
Mode of Study: full
Academic Year: 2020-2021 н.р.
Language of Defence: англійська
Abstract: Zolotarova K.S. (performer), Kravets T.Yu. (supеrvіsоr). The analysis of the turbine capacitor K-1000-60/1500-2 for the power unit of 1000 MW at the Zaporizhzhya Nuclear Power Plant for optimization in different modes. Master’s thesis. - Lviv Polytechnic National University, Lviv, 2020. Extended abstract At present, Ukraine’s nuclear energy has four nuclear power plants - Zaporizhia, Khmelnytsky, Rivne and South Ukraine. All NPPs operate water-to-water power reactors. To increase the reliability and safety of the equipment of the 2nd circuit of the turbine unit, including steam generators, modernization with replacement of capacitors is proposed, in particular for power units with a capacity of 1000 MW of Zaporizhzhya NPP [1]. An important role in the safe and reliable operation of NPPs is played by the quality of materials from which the equipment is made, the development of the design taking into account all risks, and the proper operation of an element in deviations from the nominal parameters [7]. To avoid damage to the tube systems of the condenser of the Zaporizhzhya NPP, during long-term operation, capacitors type K - 38080 are installed, which reduce the probability of damage to the casing due to the development of various types of corrosion by cooling water and, consequently, reduce resources and increase operational reliability. . The paper considers the project of modernization of condensers "basement placement" with cooling pipes made of copper-nickel alloy brand MNZh5-1 on condensers of new design - "block-modular" design with cooling pipes made of corrosion-resistant steel brand TP 316L and a detailed analysis of its work at different modes. The master ’s thesis is devoted to the study of the capacitor K - 38080 and vibration resistance of cooling pipes in different modes. The object of research is the process of steam condensation in the condenser of the steam turbine K - 1000 - 60/1500 of Zaporizhzhya NPP. The subject of research - the dependence of the vacuum in the capacitor on the operating parameters of its operation. The purpose of the study - to determine the impact of changes in the mode of operation of the capacitor on the process of steam condensation; study of vibration oscillations for reliable and safe operation of the capacitor. Key words - condenser, steam turbine K-1000-60 / 1500-2, analysis of condenser operation, calculation of vibration strength. The first section considers the schematic diagram and layout of the Zaporizhzhya NPP power unit. The main attention is focused on the general characteristics of the steam turbine type K - 1000-60 / 1500-2, and its operating modes. [1,2] In the second section a detailed consideration of the project of replacement of capacitors K - 33160, which is made of copper-nickel alloy. Given the experience of operation of the turbine, it was decided to replace the existing capacitor K - 33160 with a capacitor "block-modular" design type K-38080. In the third section, the thermal-hydraulic calculation of the capacitor K-38080, at loads of 80%, 100% and 120% of the nominal [2]. The calculation of steam velocities in the inlet section and in the steam passages of the condenser tube bundle was performed [3]. Based on these calculations, graphs of the dependence of the pressure in the condenser and the temperature pressure on the steam flow and the temperature of the cooling water are constructed. In the fourth section, the calculation of the condenser of the turbine K - 1000 - 60/1500 - 2 for vibration strength, namely its cooling pipes at different frequencies and different conditions of its operation (with water and without water). Based on the results of the calculation, graphs of oscillations of cooling pipes are constructed for their evaluation on vibration strength. This calculation of the welded pipes of the capacitor "block-modular" design is carried out in accordance with the requirements for determining the spectrum of natural frequencies of oscillations [5]. In the economic part of the work, the size and structure of capital investments are determined, the annual operating costs, components of the unit cost of electricity and the payback period of the power unit are calculated. In the 6th section of automation the system of automatic water level control in the turbine condenser at NPP with WWER - 1000 reactor is designed, the technological scheme is briefly described, the control system and technical means of automation are selected, the functional scheme of automation is made and described [4]. Thus, the master’s thesis systematizes knowledge of many disciplines, which ultimately not only allowed a more detailed assessment of some elements, components and systems of NPPs in general, but also clearly showed the feasibility of installing capacitors type K-38080 on units of other NPPs with similar units, which will be operated in the future. Rеfеrеnсеs: 1. Аlbum SGST ОP ZNPP, [2016] Zаpоrоzhуе NPP, Еnеrgоdаr. 2. Bеrmаn L.D., Zеrnоvа Е.P., [1959] "Guidance on thermal calculation of surface condensers of powerful turbine thermal and nuclear power plants", Sоуuztесhеnеrgо, Mоsсоw. 3.Bоdаshkоv N.K., [1982] "Оpеrаtіоn оf stеаm turbіnеs", Stаtе Еnеrgу Еdіtіоn, Mоsсоw – Lеnіngrаd. 4. Brуlіnskу R.B., Stаsіuk І.D., Krуkh G.B., [2019] "Аutоmаtіоn оf thе tесhnоlоgісаl prосеss аt а nuсlеаr pоwеr plаnt. Mеthоdісаl іnstruсtіоns - Lvіv: Lvіv Pоlуtесhnіс Nаtіоnаl Unіvеrsіtу Publіshіng Hоusе. 5. Brоdоv Уu.M., Аrоnsоn K.Е., [2008] "Hеаt еxсhаngеrs оf pоwеr plаnts", Еkаtеrіnburg. 6. Kіrsаnоv І.N., [1965] "Соndеnsіngunіts", Prоduсtіоn "Еnеrgу" Mоsсоw. 7.MаrgulоvаT.H., [1978]"Nuсlеаr Pоwеr Plаnts", Mоsсоw, Hіghеr Sсhооl.