Study on Release Process of Micro-CAES Used Screw Expander

Abstract:

The compressed air energy storage (CAES) has a promising application prospect to ease electic load and match intermittent renewable energy, such as solar and wind energy. The release process influences the output power and system performance. In this paper, a mathematical model is built to simulate the release process of a micro-CAES system with screw expanders. The results show that the rotation angles of suction, expansion and discharge processes are depended on the volume ratio. The chamber volume of 2^nd stage expander is larger than the 1^st stage one for two expanders. In the constant suction pressure (CSP) condition, the mass remained in the tank is lower slightly than it in the various suction pressure (VSP) condition for the same set pressure in the tank. The CSP condition needs more time to finish the release process. The decrease of air temperature in the CSP condition is smaller than it in the VSP one. The power output decreases with time in the VSP condition, but it is a constant value throughout the release process in the CSP condition. All the average output and the total work in the VSP condition are larger than them in the CSP condition.

• Periodical: Applied Mechanics and Materials (Volumes 457-458)
• Pages: 379-383
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.457-458.379
• Online since: October 2013
• Authors: Guang Bin Liu, Qi Chao Yang, Ze Gang Qian, Yuan Yang Zhao, Le Wang, Lian Sheng Li, Bin Tang
• Keywords: CAES, Release Process, Screw Expander

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