«Proceedings of Gubkin University»

Application of thermal accumulators to increase efficiency of air storage stations

UDC: 620.92
DOI: 10.33285/2073-9028-2023-3(312)-125-144

Authors:

¹ National Research University “Moscow Power Engineering Institute”, Moscow, Russian Federation
² Kazan State Energy University, Kazan, Russian Federation
³ National University of Oil and Gas “Gubkin University”, Moscow, Russian Federation

Keywords: energy storage, air-storage power plant, thermal battery, peaking power plant

Annotation:

The production of electricity by wind and solar power plants is characterized by significant daily and seasonal unevenness, which affects the operating modes of the generating equipment of power plants. An increase in the installed capacity of renewable energy sources (RES) leads to an increase in the required control range of the power system. This is followed by the need to introduce flexible generating equipment or storage power plants. A potential solution to the issue of managing peak conditions is the commissioning of air storage power plants (ASPS). The advantages of using VNPP as a method of accumulating electrical energy include high maneuverability and operation in wide temperature and pressure ranges. One of the current trends in increasing the efficiency of VNPP is the recovery of thermal energy within the cycle through a thermal accumulator. The analysis of the thermal circuits of adiabatic VNPP shows the relevance of using thermal accumulators for the recovery of thermal energy from air. A thermal accumulator, as a rule, must ensure the storage of thermal energy in the temperature range of 80–400 °С. Taking into account the current level of development of science, phase change materials can be used for these purposes. The main advantages of using such materials are high heat capacity and constant operating temperature. Phase change materials are capable of accumulating and releasing large amounts of thermal energy when a substance transitions from one phase to another, most often from a solid phase to a liquid. The article presents a numerical simulation of the melting/crystallization process, with the help of which the time to reach the melting temperature and the time of phase transition are determined.

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