Water-Spray-Cooled Quasi-Isothermal Compression Method: Water-Spray Flow Improvement.

Guanwei Jia,Weiqing Xu,Maolin Cai,Xuanwei Nian,Yan Shi

doi:10.3390/e23060724

Guanwei Jia, Weiqing Xu + Show 3 more

Open Access

https://doi.org/10.3390/e23060724

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Journal: Entropy	Publication Date: Jun 6, 2021
Citations: 7	License type: CC BY 4.0

Affiliation: Henan University, Beihang University

Abstract

Water-spray-cooled quasi-isothermal compressed air energy storage aims to avoid heat energy losses from advanced adiabatic compressed-air energy storage (AA-CAES). The compression efficiency increases with injection water spray. However, the energy-generated water spray cannot be ignored. As the air pressure increases, the work done by the piston and the work converted into heat rise gradually in the compression process. Accordingly, the flow rate of the water needed for heat transfer is not a constant with respect to time. To match the rising compression heat, a time sequence of water-spray flow rate is constructed, and the algorithm is designed. Real-time water-spray flow rate is calculated according to the difference between the compression power and heat-transfer power. Compared with the uniform flow rate of water spray, energy consumption from the improved flow rate is reduced.

Highlights

Quasi-Isothermal CompressionThe greatest demand of global electrical energy (>70%) is met by burning traditional fossil resources
The results showed that the air temperature gradient was nearly constant (1 ◦ C) from the outlets of three stages, and quasi-compression efficiency reached 64% at a mass loading of 5
The compressor parameters used in the difference in total power consumption between the two spray schemes was compared calculation are shown in

Summary

Introduction

The greatest demand of global electrical energy (>70%) is met by burning traditional fossil resources. The development of renewable energies (such as wind, solar, etc.) is often advocated as an effective way to meet the demand for electrical energy and reduce CO2 emissions [2]. For this reason, renewable energies have been rapidly developed at a global scale [3]. The intermittency and fluctuation of renewable resources create obstacles and challenges to accessing to the electrical grid [4]. Large-scale energy storage for stability and security of the energy supply is recognized as an efficient resolution to the obstacles [5].

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Conclusion