scholarly journals The Fracture Influence on the Energy Loss of Compressed Air Energy Storage in Hard Rock

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Hehua Zhu ◽  
Xingyu Chen ◽  
Yongchang Cai ◽  
Jianfeng Chen ◽  
Zhiliang Wang
Keyword(s):  
Energy Storage ◽  
Energy Loss ◽  
Gas Flow ◽  
Hard Rock ◽  
Gas Injection ◽  
Compressed Air ◽  
High Porosity ◽  
Compressed Air Energy Storage ◽  
Crack Open ◽  
Discrete Crack

A coupled nonisothermal gas flow and geomechanical numerical modeling is conducted to study the influence of fractures (joints) on the complex thermohydromechanical (THM) performance of underground compressed air energy storage (CAES) in hard rock caverns. The air-filled chamber is modeled as porous media with high porosity, high permeability, and high thermal conductivity. The present analysis focuses on the CAES in hard rock caverns at relatively shallow depth, that is, ≤100 m, and the pressure in carven is significantly higher than ambient pore pressure. The influence of one discrete crack and multiple crackson energy loss analysis of cavern in hard rock media are carried out. Two conditions are considered during each storage and release cycle, namely, gas injection and production mass being equal and additional gas injection supplemented after each cycle. The influence of the crack location, the crack length, and the crack open width on the energy loss is studied.

scholarly journals A Coupled Thermo-Hydro-Mechanical Model of Jointed Hard Rock for Compressed Air Energy Storage

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Xiaoying Zhuang ◽  
Runqiu Huang ◽  
Chao Liang ◽  
Timon Rabczuk
Keyword(s):  
Renewable Energy ◽  
Energy Storage ◽  
Gas Flow ◽  
Hard Rock ◽  
Compressed Air ◽  
Compressed Air Energy Storage ◽  
Renewable Energy Resources ◽  
Mass Source ◽  
Discrete Crack ◽  
Rock Cavern

Renewable energy resources such as wind and solar are intermittent, which causes instability when being connected to utility grid of electricity. Compressed air energy storage (CAES) provides an economic and technical viable solution to this problem by utilizing subsurface rock cavern to store the electricity generated by renewable energy in the form of compressed air. Though CAES has been used for over three decades, it is only restricted to salt rock or aquifers for air tightness reason. In this paper, the technical feasibility of utilizing hard rock for CAES is investigated by using a coupled thermo-hydro-mechanical (THM) modelling of nonisothermal gas flow. Governing equations are derived from the rules of energy balance, mass balance, and static equilibrium. Cyclic volumetric mass source and heat source models are applied to simulate the gas injection and production. Evaluation is carried out for intact rock and rock with discrete crack, respectively. In both cases, the heat and pressure losses using air mass control and supplementary air injection are compared.

Design, thermodynamic, and wind assessments of a compressed air energy storage (CAES) integrated with two adjacent wind farms: A case study at Abhar and Kahak sites, Iran

Energy ◽  
2021 ◽  
Vol 221 ◽  
pp. 119902
Author(s):  
Amir Reza Razmi ◽  
M. Soltani ◽  
Armin Ardehali ◽  
Kobra Gharali ◽  
M.B. Dusseault ◽  
...  
Keyword(s):  
Energy Storage ◽  
Wind Farms ◽  
Compressed Air ◽  
Compressed Air Energy Storage
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