The operation analysis of the block desalination equipment of the 1000 MW power unit with the use of modern reagents at the Rivne NPP.
Students Name: Fedyniak Oleg
Qualification Level: magister
Speciality: Heat and Power Engineering
Institute: Institute of Power Engineering and Control Systems
Mode of Study: part
Academic Year: 2022-2023 н.р.
Language of Defence: ukrainian
Abstract: Fedyniak O.E., Galyanchuk I.R. (supervisor). The operation analysis of the block desalination equipment of the 1000 MW power unit with the use of modern reagents at the Rivne NPP. Master’s thesis. – Lviv Polytechnic National University, Lviv, 2022. Extended abstract. Energy is the leading branch of the national economy of Ukraine. Its development, in turn, depends on natural conditions, the state and development of other industries, the technical level and productivity of industrial plants [1, 2]. Energy management includes power generation stations, networks and energy transmission systems, and end consumers. A powerful energy complex for the production, distribution and sale of thermal and electrical energy has been created in Ukraine. Centralized production of electrical energy, in the basic part of Ukraine’s load schedule, is carried out at NPP power units. The equipment of modern nuclear power plants is operated under high thermal loads, which requires a strict limitation of the amount, thickness and quality of deposits on the heating surfaces under the conditions of the normal temperature regime of their metal operation. Such deposits are formed from impurities that enter the cycle of the power plant, including with additional water for feeding, so ensuring the high quality of water coolants of the NPP is one of the most important tasks. The use of water, as a high-quality heat carrier, also simplifies the solution to the problems of obtaining clean steam in the steam generator, minimizing corrosion rates of structural materials of the principle thermal circuit, turbines and equipment of the condensation and feeding tract. Thus, the quality of water treatment at NPPs is closely related to the reliability and cost-effectiveness of modern highly efficient steam turbine equipment and the safety of nuclear power plants. To meet various requirements for the quality of water used in the production of electrical and thermal energy, there is a need for special physical and chemical treatment of natural water. This water is, in fact, the raw material, which, after proper treatment, is used as the initial working fluid at the water treatment plant, as well as for other purposes at the NPP. Additional water received at the water treatment plant, after treatment using physical and chemical cleaning methods, is sent to the circuit to replenish steam and condensate losses in the cycle [3, 4, 5]. In this master’s qualification work, attention is focused on the development of technical solutions for the chemical water purification system of power units of the Rivne NPP through the analysis of the influence of the choice of coagulants and flocculants on the quality of clarified water, as well as the introduction of modern mixed-action filters. Study object - additional water purification processes for various NPP circuits. Scope of research - the effect of different types of coagulants on water purification indicators, the operation of the chemical water treatment system and the efficiency of the power units with a capacity of 1000MW of the Rivne NPP. Goal of research - consists in choosing the optimal type of coagulants to ensure the necessary indicators of water purification and high subsequent efficiency of power units with a capacity of 1000MW of the Rivne NPP. The first section of the work gives a general description of water treatment for NPP power units. In the second section, methods of chemical water purification for the needs of the 1000 MW power unit of the Rivne NPP are considered. The third chapter is devoted to the general characteristics of the coagulation process, its physical and chemical bases and the process of coagulation of water in the clarifier. The fourth chapter presents the results of the analysis of the influence of flocculants and coagulants on the quality of clarified water. In the economic part of the work, the calculation of the economic effect of replacing the heat exchange surfaces of the steam generator with titanium ones was carried out due to the fact that the brass tubes are quickly clogged and fail, in particular, due to the ineffective mode of operation of the chemical water purification system. In the automation section, automatic chemical control of the water-chemical regime of the NPP power unit was developed and the selection of devices and means for its implementation was carried out [5]. Keywords - Nuclear power plant, power unit, chemical water treatment, coagulant, flocculant, clarifier. References. 1. Fuel and energy complex of Ukraine on the threshold of the third millennium: Scientific publication of the National Academy of Sciences of Ukraine. – Kyiv: Ukrainian Encyclopedic Knowledge, 2001. – 400 p. 2. Energy resources and flows: NAS of Ukraine. - Kyiv: Ukrainian encyclopedic knowledge, 2003. – 472 p. 3. Ions in chemical technology / Edited by B. P. Nikolskyi and P. G. Romankov. - L.: Khimiya, 1982. - 389 p. 4. Zakharov E.I. Ion-exchange equipment of atomic industry /E.I. Zakharov, B.I. Ryabchikov, V.S. Dyakov. - M.: Energoatomizdat, 1987. - 249 p. 5. Ryabchikov B.E. Contemporary methods of water preparation for industrial and household use / B.E. Ryabchikov. - M.: DeLi print, 2004. - 301 p. 6. Vitalyev V.P., Falikov V.S. (1997) Devices and means of automation, - M.: Stroyizdat, - 174 p.