The operation analysis of systems of selection and intermediate overheating of steam aimed at increasing of the K-1000-60/1500-2 turbine efficiency
Students Name: Hula Kostiantyn Anatoliiovych
Qualification Level: magister
Speciality: Heat and Power Engineering
Institute: Institute of Power Engineering and Control Systems
Mode of Study: full
Academic Year: 2020-2021 н.р.
Language of Defence: ukrainian
Abstract: Abstract Hula K. A., Matiko H. F. (supervisor). The operation analysis of systems of selection and intermediate overheating of steam aimed at increasing of the K-1000-60/1500-2 turbine efficiency Master’s thesis. - Lviv Polytechnic National University, Lviv, 2020 Extended abstract. Master’s thesis is devoted to improving the efficiency of the turbine K-1000-60/1500-2 by improving the system of intermediate superheating of steam. In particular, a method of increasing the efficiency of the system of intermediate superheating of steam by introducing an additional film separator and modernization of the superheater separator [1]. Study object – thermal and gas-dynamic processes in the turbine K-1000-60/1500-2. Scope of research – systems of selection and intermediate superheating of turbine steam K-1000-60/1500-2 Goal of research – to increase the efficiency of the turbine K-1000-60/1500-2 by improving the system of intermediate superheating of steam by introducing into the system an additional film separator and modernization of the superheater separator. The master’s qualification work describes in detail the steam turbine unit K-1000-60/1500-2, which is designed to drive a turbogenerator of alternating current TVV-1000-4UZ with a capacity of 1000 MW. Turbine K-1000-60/1500-2 contains one high-pressure cylinder and three low-pressure cylinders with unregulated steam extraction with moisture separation and two-stage steam overheating [1 - 3]. The work of turbine steam taking away system and intermediate superheating system is analyzed. To ensure the separation of moisture contained in the steam after the high pressure cylinder (HPC), and to implement its two-stage superheating use 4 separators-superheaters SPP-1000. Regenerative heating of turbine condensate is provided by four groups of low-pressure heaters, and regenerative heating of feed water - by a thermal deaerator and two groups of high-pressure heaters [1 - 3]. The master’s thesis analyzes the operation of steam superheater separators at Ukrainian nuclear power plants, in particular SPP-1000, and highlights its main disadvantage, namely: the input chamber of wet steam does not provide uniform distribution of the device, some separation units are overloaded, the upper location of the separator causes additional moisture superheater. Large values of moisture in the steam increase the consumption of heating steam in superheaters, which in turn reduces the efficiency of the turbine [1-4]. In order to increase the efficiency of the turbine, it is proposed to include an additional moisture separator in the circuit before the SPP-1000, which will reduce the loading on it. In this case, the main moisture will be removed in the remote separator, while the louver separator in the SPP-1000 will perform only "fine" steam cleaning. The introduction of additional separators before the SPP helps to increase the electrical capacity of the turbine by 4-5 MW, as well as to reduce the erosion of the blades of the turbine last stages [1-3]. The work also analyzes in detail the operation of the separator-superheater as part of the system of intermediate superheating of steam. The technique for thermal calculation of the superheater is presented and the hydraulic calculation of the separation part of the apparatus is carried out. To improve the characteristics of steam overheating, it is proposed to increase the surface area of heat exchange by replacing the tubes of the separator-superheater with a transverse fin [4-9]. Improving the design of the steam superheater separator improves the efficiency of the intermediate steam superheating system, which in turn increases the efficiency of the entire steam turbine unit K-1000-60/1500-2. The work also develops an automated control system of technological process in the reduction and cooling unit with the use of modern means of automation, which also improves the efficiency of the turbine K-1000-60/1500-2. In particular, the system provides the regulation of temperature and pressure of reduced steam [1,2]. The master’s thesis analyzes the economic effect of the proposed measures for improving the system of intermediate superheating of steam. In particular, conclusions were made about the technological feasibility and economic effect of the introduction of the additional separator in the system of intermediate superheating of steam and modernization of the superheater separator. Due to the implementation of the proposed reconstruction of the superheater separator, it is possible to increase the efficiency of its operation and obtain an economic effect for the whole NPP unit [4]. Keywords – steam turbine unit, steam superheater separator, steam extraction system, intermediate steam superheating, film separator. References. 1. Collection of manuals for the personnel of the turbine compartment of the Balakovo NPP, Book 5. Steam turbine K-1000-60/1500-2. Structure and basics of operation, Manual 26: Steam turbine K-1000-60/1500-2. Structure and basics of operation/ UTC Balakovo NPP. 2. Antonova, A.M., Vorobiev, A.V. (2009). Nuclear power plants: Textbook. Tomsk: Tomsk Polytechnic University Publishing House. 3. Collection of manuals for the personnel of the turbine compartment of the Balakovo NPP, Book 6. Steam turbine K-1000-60/1500-2. Structure and basics of operation, Manual 29: Intermediate overheating systems RB, separation and condensate of heating steam SPP-1000 RB, RN. 4. 5. K-1000-60/1500 turbine steam superheater separator for NPPs with WWER-1000 reactor. (1979). Technical conditions, TU 108-843-79, Item R-6193.