The reliability and maneuverability increase of the PT-60-130/13 turbine unit having transferred to the heating operation mode at the Bila Tserkivska TPP.

Students Name: Rymaruk Taras Anatoliiovych
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: Rymaruk T. A., Matiko H. F. (supervisor). The reliability and maneuverability increase of the PT-60-130/13 turbine unit having transferred to the heating operation mode at the Bila Tserkivska TPP. Master’s thesis. – Lviv Polytechnic National University, Lviv, 2022. Extended abstract Today, in Ukraine, solving the problem of reliable and economical operation of thermal power plant equipment, which is physically and morally outdated and in need of modernization, reconstruction or complete replacement, is a particularly urgent task [1, 2]. However, in order to ensure the stability of the power system, it is important to preserve the efficiency and safety of the operating thermal power plants and the possibility of obtaining additional peak power without reducing the operational efficiency [3, 4]. On a number of high-pressure turbines, due to their unsatisfactory technical condition, it is possible to remove the last stages. Under such conditions, it is expedient to modernize part of the turbines with their transfer to the reduced vacuum mode and the organization of two-stage heating of mains water. This solution is beneficial due to the fact that the heat loads released with hot water of the CHP are constantly increasing, and in the winter period, to ensure the given release of thermal energy, it is necessary to turn on peak heat sources. Study object – basic thermal diagram of PT-60-130/13 turbine installation of Belotserkivska thermal power station. Scope of research – methodical approaches to solving the problems of calculation substantiation of increasing the reliability and maneuverability of the PT-60-130/13 turboplant of Bila Tserkivska TPP after transferring it to the heating mode of operation. Goal of research ensuring the efficient operation of the thermal part of the PT-60-130-13 turbine unit of Bila Tserkivska TPP, modernizing part of the turbine with transferring it to the reduced vacuum mode and organizing two-stage heating of network water. In the case of switching to the mode of operation with impaired vacuum, the protic part is reconstructed with the removal of the last stages of the low-pressure part, the thermal circuit and the sealing circuit, and the protection system is organized, which remains in operation of the last stage. Mains water is also supplied to the condenser and, if necessary, the condenser is strengthened. It is possible to switch to a permanent mode of operation with a reduced vacuum, as well as a seasonal one, that is, with the supply of mains and circulating water to the condenser. Transferring the turbine to the degraded vacuum mode is technologically not very difficult and is usually carried out by repair organizations without the involvement of turbine plants. In this case, it is worth taking into account the limitation of increasing the final pressure to pk = 0.3 bar and increasing the temperature of the exhaust pipe tk = 90 °C. Exceeding these parameters will lead to an emergency shutdown of the turbine. In the case of switching the turbine to a reduced vacuum, the following options are possible: the possibility of operation only on mains water (option 1); the possibility of transferring from mains water to circulating water and back without stopping the turbo installation (option 2). In order to ensure higher reliability and maneuverability of the turbo installation, option 2 was chosen in the master’s qualification work, as it allows the turbo unit to work according to both the thermal and electrical schedule, to cover the basic (in the case of supplying mains water to the condenser) and peak (in the case of supplying circulating water water) load. Also, the use of this scheme makes it possible to avoid an emergency shutdown of the turbine unit in the event of an accident in the heating networks and the termination of the supply of network water to the condenser, since it is possible to switch to circulating water without stopping the turbine. Strength calculations showed that to eliminate the shortcomings of option 2, it is necessary to take measures to strengthen the pipe boards with additional anchor ties. The factory design of the condenser is designed for a maximum pressure drop between the water and steam chambers of the condenser of 0.15 MPa. And the estimated pressure drop when the turbo installation switches to a reduced vacuum between the water and steam chambers of the condenser can be 0.47 MPa. For the reliable operation of the condenser, the existing number of anchor connections of the pipe boards must be increased from 14 to 36. The economic efficiency of the reconstruction consists in increasing the production of electricity based on heat consumption. The results of the economic indicators of the reconstruction showed that the transfer to the degraded vacuum has a gain in savings compared to the basic one. In the "Automation" section, the question of automation of the network heater is considered. The following types of automation are selected: measurement of water temperature, steam at the entrance to the heater; measurement, adjustment, signaling and blocking of water temperature at the outlet of the heater; measurement of condensate temperature at the outlet of the heater; measurement of water pressure at the inlet and outlet of the heater; steam pressure measurement at the heater inlet; measuring network water consumption, etc. Keywords: thermal scheme of PT-60-130/13 turbo installation, reconstruction, deteriorated vacuum, condenser, mains water. References 1. Volchyn, I. A., Dunaievska, N. I., Haponych, L. S., Cherniavskyi, M. V., Tokal, O. I., Zasiadko, Ya. I. (2013). Prospects for the introduction of clean coal technologies in the energy industry of Ukraine. – K.: HNOZIS. – РР. 28. 2. Chernousenko, O.Iu., Peshko, V.A. (2016). 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