STUDY OF THE CONDENSER’S OPERATING CHARACTERISTICS OF THE NPP UNIT

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The paper shows that the technical condition of condensing devices of steam turbines largely determines the amount of electricity losses, reliable and economical operation of NPP units, and the modernization of steam turbine capacitors will provide a significant increase in electricity generation with relatively low capital investment compared to construction of new NPP power units. Analysis of the perfection of the heat transfer process in the condenser according to the principles of thermoeconomic diagnostics to identify the causes of abnormal operation of the power conversion system showed that the main causes of load reduction are determined by rising cooling water temperature and deviation of steam pressure from normal assessment of contamination of the heat transfer surface, which significantly affects the reduction of electricity generation. The modernization main points of the capacitor of the Zaporizhzhya NPP power unit № 3 on the principle of "block-modular" design developed by PJSC "Turboatom" and the characteristics of the capacitor provided by the new design are considered. The method of thermal calculation of the condenser with the use of iterative methods, which takes into account the presence of air leakage in the space of the condenser and the appearance of contamination of the heat exchange surface, is given. The increase of electric power at the generator terminals at change of steam load factor and pollution thickness is calculated and analyzed. An analytical dependence of the investigated parameters of reducing the increase in electric power during the modernization of the capacitor is obtained and the interpretation of the results is carried out. The work emphasizes the importance of processing the results of diagnostics and monitoring of the technical condition of steam turbines condensing devices and information about their impact on the amount of electric power generation.