Comprehensive study of the efficiency of combining NPP with a multifunctional thermal storage system
Keywords:
nuclear power plant, phase change heat accumulator, multifunctional additional steam turbine plant, NPP auxiliary needs reservationAbstract
A method has been developed for combining a NPP with a multifunctional thermal storage system, which includes a phase transition accumulator and an additional low-power STU. The use of a storage system will allow optimizing the structure of power generating capacities with the possibility of increasing the share of powerful power units in the UES will reduce emissions into the environment and increase the export of natural gas and other oil products by reducing the share of thermal power plants operating on fossil fuels. In addition, the presence of a low-power STP as part of the system makes it possible to ensure the backup of the NPP's own needs in the event of a complete blackout. The work carried out a comprehensive analysis of the effectiveness of the developed system, taking into account the requirements of the energy sales market, predicted daily differentiated tariffs and the economic annual effect of reducing the risk of damage to the reactor core in emergency situations with a plant blackout. The calculations also took into account the results of phase change accumulator design optimization on the basis of a previous study of the effect of the cyclic phase change accumulator operation on its resource. Based on the data of the forecast of the Ministry of Economic Development of Russia, a comprehensive study of the effectiveness of the developed storage system was carried out under the conditions of fulfilling the requirements of the System Operator of the Unified Energy System of Russia on the participation of NPPs in the overall primary regulation of the current frequency in the power system, taking into account the effect of increasing NPP safety. Calculations have shown that the system will fully pay off in 13-17 years.
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