The timescale of the energy-release process of an energy storage system has put forward higher requirements with the increasing proportion of new energy power generation in the power grid. In this paper, a new type of compressed-air energy storage system with an ejector and combustor is proposed in order to realize short-timescale and long-timescale energy-release processes under the non-supplementary combustion condition and ejector supplementary combustion condition, respectively. A simulation model of the new system is established in APROS software. The results of this study show that the new system can realize continuous power output when energy storage and energy release operate simultaneously, and especially when the ejector coefficient is 0.8 and burner thermal power is 10 MW, the power-generation time is 12.45 h and the total generated power is 140,052 kW∙h, which are 15.6 and 17.5 times greater those of the short-timescale condition, respectively. In summary, the compressed-air energy storage system with an ejector and combustor that is proposed in this paper can flexibly meet the demands of multiple timescales’ power generation.
Urban buildings consume a lot of energy every year. Through analyzing the characteristics of urban buildings energy supply and compressed air energy storage (CAES) and considering the electric energy, thermal and cold energy output from CAES, this paper constructs the overall framework of CAES providing urban buildings with combined cooling, heating and power (CCHP), which can meet the energy demand of urban buildings, improve the system efficiency of CAES, make profit from the peak and valley electric charges difference of power grid, and it also has a broad range of popularization and application.
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