District heating system assisted by thermochemical sorption heat storage

• It provides a comprehensive system for achieving low-carbon district heating. • CRTB and HP integration reduces heating station output by 43.7% seasonally. • Reduction of 623.4 tons of coal and 1697.9 tons of CO 2 at optimal operating strategy. • HP and CRTB operating in synergy provide 456.2 and 847.5 MWh of heat respectively. Against the backdrop of energy shortages and ongoing structural transformation in the energy sector, developing efficient and clean heating technologies has become an urgent issue to be addressed within the industry. Thermochemical sorption heat storage offers advantages such as high energy storage density and low heat loss during long-term storage. It can be coupled with renewable energy sources to address the spatiotemporal mismatch between renewable energy supply and demand, thereby enabling clean heating. However, at the large-scale application level, thermodynamic analysis remains insufficient regarding the implementation of compression-assisted resorption heat storage in district heating. The integrated heating system based on thermochemical resorption heat storage regulation is initially proposed in this work. The mathematical model of the district heating system was constructed, and the dynamic characteristics of the system under different operation strategies were compared and analyzed, obtaining the optimal operation strategy of the system, The heat pump and CRTB respectively contribute 456.2 MWh and 847.5 MWh of seasonal heat, respectively, reducing heat station output by 43.7%. The practical application value of the compression-assisted thermochemical resorption heat storage technology has been proved. Taking a typical residential community in Beijing as an example, by adopting the optimal operation strategy, the entire heating season reduced coal consumption by 623.4 tons and carbon dioxide emissions by 1,697.9 tons. The findings of this study provide some insights for the large-scale district heating application of thermochemical sorption heat storage systems.