Optimizing Load Flexibility in Coal-Fired Power Plants through Combined High-Temperature Thermal Energy Storage

Abstract

A novel method is proposed for increasing load flexibility in coal-fired power plants (CFPP) by combining an extra thermodynamic cycle with high-temperature thermal energy storage (HTTES) system. The purpose of the study is to determine if it is feasible to integrate HTTES into a standard CFPP's steam-water cycle and evaluate the possibility of obtaining high round-trip efficiency through this integration. A detailed analysis of the thermal system and operation mode of a CFPP with HTTES is provided. A subcritical CFPP model is developed for performance assessment and discussion. The proposed system is implemented using MATLAB, and the results demonstrate improved load flexibility for conventional CFPPs. While the primary unit operates at rated capacity, additional net power generation is possible. This study contributes comprehensive insights into utilizing high-temperature thermal energy storage (TES) for enhancing load flexibility in CFPPs.