The operation analysis of high pressure regeneration system aimed at increasing of the K-1000-60/3000 turbine efficiency
Students Name: Shulha Dmytro Yulianovych
Qualification Level: magister
Speciality: Thermal Power Plants
Institute: Institute of Power Engineering and Control Systems
Mode of Study: full
Academic Year: 2020-2021 н.р.
Language of Defence: ukrainian
Abstract: ABSTRACT Shulha D.Y., Matiko H.F. (supervisor). The operation analysis of high pressure regeneration system aimed at increasing of the K-1000-60/3000 turbine efficiency. Master’s thesis. - Lviv Polytechnic National University, Lviv, 2020. Extended abstract. In the master’s thesis the question of increasing the efficiency of operation of the K-1000-60/3000 turbine is considered by improving the high pressure regeneration system. Particularly, a method of increasing the efficiency of the high-pressure heater PV-2500-97-28A, which is а part of the regeneration system, is proposed by improving its constructive elements [1]. The research was performed on the basis of the schematic diagram of the NPP with a capacity of 1000 MW with a turbine K-1000-60/3000 [2]. Study object – thermal and gas-dynamic processes in the turbine K-1000-60 / 3000. Scope of research – the high-pressure regeneration system of the turbine K-1000-60/3000. Goal of research – to increase the efficiency of the turbine K-1000-60/3000 by improving the design of the heater PV-2500-97-28A in the high pressure regeneration system. The master’s thesis describes in detail the steam turbine unit K-1000-60/3000, which is designed to drive a turbogenerator of alternating current TVV-1000-2UZ with a capacity of 1000 MW. The K-1000-60/3000 turbine consists of one high-pressure cylinder and four low-pressure cylinders, which are designed to convert the thermal energy of steam into mechanical energy of the turbine rotor rotation [3]. The operation of the high pressure regeneration system of the turbine and its main components is described in the master’s thesis. In particular, the steam regeneration process is described in detail. The part of the steam, having worked in several stages of the turbine, is extracted from it and used to heat feed water (condensate) supplied to steam generators [4]. Iа the regeneration process is available, the feed water will have a higher temperature, and more steam can be produced at the same reactor capacity, because less heat is spent to heat the water to a boiling point. The thesis shows that using the regeneration in the thermal scheme of steam turbines increases the efficiency of the cycle by reducing the heat that is lost with circulating water, because it reduces the amount of steam entering the condensers [5]. The master’s thesis also analyzes in detail the operation of high pressure heaters (HPH), which are the part of the regeneration system and are designed to heat the feed water supplied by feed pumps to steam generators [5]. The thermal and hydraulic calculation of the high-pressure heater PV-2500-97-28A is performed in the work. The influence of the method of arrangement of heat exchange surfaces, namely the change of the inclination angle, on the efficiency of the heater is investigated. Based on the performed analysis, an improved design of a high-pressure heat exchanger is proposed with dismantling the part of spiral heat exchange tubes and change of their inclination angle up to 25o [6]. Thus, the possible savings due to the reduction of the metal capacity of the heat exchanger without reducing the heat transfer coefficient are determined. Improving the design of high-pressure heat exchangers improves the efficiency of the regeneration system, which in turn increases the efficiency of the turbine unit K-1000-60/3000. We have also developed an automated control system for the process of heating the feed water in a high pressure heater using modern means of automation (microprocessor controller Vision V570). It also helps to increase the efficiency of the regeneration system of the turbine K-1000-60/3000. In particular, the developed automated system provides regulation of temperature and pressure of feed water. According to the research results, the economic effect of the proposed measures for improving the high pressure regeneration system is analyzed. In particular, conclusions are made about the technological feasibility of modernization of heaters in the high pressure regeneration system and the economic effect of its implementation. By performing the proposed reconstruction of the high pressure heater in the regeneration system, it is possible to achieve capital savings without reducing the efficiency of the heater, and thus get the economic effect of the proposed measures for the whole NPP unit. Key words: steam-power cycle, K-1000-60/3000 turbine, high pressure heaters, regeneration system, efficiency increase. References. 1. Ganachivskyi, O.P. (1980). High pressure heater. Technical documentation. Passport. M.: MEI Publishing House. 2. Vyshnevskyi, V.N, Nikolaiev, O.B. (2007). Technology of electricity production at a nuclear power plant. Chapter "Steam turbine unit": Manual for the student / OP "Khmelnitsky NPP". - Khmelnitsky, L.: Energoatomizdat. 3. Aronson, K.E. et al. (2002). Heat exchangers of power plants: a textbook for universities. Yekaterinburg: Publishing House “Socrat”. 4. Bersienшev, G.M., Borovkov, V.M. (1986). Operation of NPP steam turbines. L.: Energoatomizdat. 5. Brodov, Y.M. et al. (2008). Handbook of heat exchangers for steam turbines. M.: MEI Publishing House. 6. Nazmieiev, Y.G., Lavygin, V.M. (1998). Heat exchangers of thermal power plants and nuclear power plants. M .: Energoatomizdat.