Heat pump power storage is a new type of large-scale physical power storage technology, which has the advantages of low cost, high energy storage density and no geographical restrictions, and has broad research value and application prospects. Heat pump power storage system usually consists of compressor, expander, heat storage and cold storage, as shown in Figure 1. Its working principle is that during energy storage, the heat energy is "extracted" from the inside of the cold storage to the heat storage through the reverse Brayton cycle (heat pump cycle), and the cold energy and the heat energy are stored; Dayton cycle (power cycle) converts stored heat and cold energy into electrical energy.
In recent years, this technology has received significant attention and support from Europe and the United States, and has been listed as one of the important energy storage technologies by the European Energy Storage Association (EASE) and the American Energy Storage Association (ESA). The Energy Storage R & D Center of Institute of Engineering Thermophysics, Chinese Academy of Sciences has been conducting research and exploration on heat pump power storage technology based on forward / reverse Brayton cycle since 2015, and has comprehensively analyzed the physical properties of the circulating working fluid and the system pressure ratio through thermodynamic modeling methods The effect of other parameters on the performance of the heat pump power storage system has been published in journals such as "Chinese Journal of Electrical Engineering".
Recently, the Energy Storage Research and Development Center of the Institute of Engineering Thermophysics has made new progress in the research of heat pump power storage technology. First of all, the research revealed the phenomenon of unbalanced mass flow of the packed bed heat and cold storage equipment in the heat pump power storage system. Through theoretical analysis, a mathematical model of slope temperature transfer and mass balance was proposed, which was verified by experiments and then proposed System efficiency expression for mass flow imbalance correction. A mass flow self-balancing heat pump power storage system based on a mixed packed bed of binary diameter is proposed. The results show that by increasing the heat capacity of the heat storage material and reducing the porosity, the mass flow imbalance can be effectively resolved, thereby achieving higher charging and discharging efficiency and energy storage density. The research results were published in Energy Conversion and Management (Wang Liang et al. Energy Conversion and Management, 2019, 185: 593-602). On the other hand, by coupling to solve the dynamics, thermodynamics and heat transfer processes, a continuous cycle unsteady state analysis of the heat pump power storage system based on the finite thermodynamics method was carried out. The non-steady-state characteristics of the continuous cycle process of the 10MW / 40MWh heat pump power storage system were studied. The factors such as the system pressure ratio, compression / expander efficiency, energy storage medium scale, energy storage equipment structure, and operation control were analyzed for heat pump power storage system. Influence and reveal its internal correlation influence mechanism. The research results were published in the energy field journal Renewable and Sustainable Energy Reviews (Wang Liang et al. Renewable and Sustainable Energy Reviews, 2019, 111: 523-534).
Relevant achievements have applied for 5 Chinese invention patents and 5 utility model patents, supported by the Youth Promotion Association project of the Chinese Academy of Sciences and the director's fund (fund evaluation award) project.
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