Design of a New Compressed Air Energy Storage System with Constant Gas Pressure and Temperature for Application in Coal Mine Roadways

Abstract

Renewable energy (wind and solar power, etc.) are developing rapidly around the world. However, compared to traditional power (coal or hydro), renewable energy has the drawbacks of intermittence and instability. Energy storage is the key to solving the above problems. The present study focuses on the compressed air energy storage (CAES) system, which is one of the large-scale energy storage methods. As a lot of underground coal mines are going to be closed in China in the coming years, a novel CAES system is proposed for application in roadways of the closing coal mines. The new system combines pumped-hydro and compressed-air methods, and features constant air pressure and temperature. Another specific character of the system is the usage of flexible bags to store the compressed air, which can effectively reduce air leakage. The governing equations of the system are derived, and the response of the system is analyzed. According to the equations, for a roadway with depth of 500 m and volume of 10,000 cubic meters, the power generation capacity of the CAES system is approximately 18 MW and the generating time is 1.76 h. The results show that the new CAES system proposed is reasonable, and provides a suitable way to utilize the underground space of coal mines.

Thermodynamic Analysis of a Hybrid Trigenerative Compressed Air Energy Storage System with Solar Thermal Energy

“…Although the COM and TUR subsystems are greatly similar to the A-CAES reported in many studies [ 10 , 11 , 12 , 13 , 14 , 15 ], the HT-CAES does possess several distinct characteristics. Firstly, compression heat energy is used to supply heating to users.…”

“…Recently, most of the literature related to A-CAES is focused on utility-scale applications [ 13 , 14 , 15 ], which are large-scale power plants located close to energy production. Nevertheless, a small-scale A-CAES (micro-CAES) may act as a trigenerative CAES (T-CAES) that is placed close to the user side and possess a tighter coupling between the DG and the energy demand, has received great attention in DES [ 16 , 17 ].…”

Parametric optimisation for the design of gravity energy storage system using Taguchi method

“…Different energy storage systems have been studied and developed over the last two decades. Most of the systems introduced were the electrical, chemical, electrochemical, thermal, and mechanical energy storage [9][10][11] . Mechanical systems, such as flywheel energy storage (FES) 12 , compressed air energy storage (CAES) 13,14 , and pump hydro energy storage (PHES) 15 are cost-effective, long-term storage solutions with significant environmental benefits for small-and large-scale renewable energy power plants to overcome energy generation fluctuation 16 .…”

Solution for Post-Mining Sites: Thermo-Economic Analysis of a Large-Scale Integrated Energy Storage System

“…The use of mine infrastructure or underground salt caverns as locations for CAES systems has been widely discussed by researchers. This applies to both diabatic [9][10][11] and adiabatic systems [12][13][14]. However, studies are often based on simple thermodynamic models whose assumptions significantly reduce the accuracy of the calculations.…”