压缩空气含水层储能系统设计及可行性分析

Subsurface System Design and Feasibility Analysis of Compressed Air Energy Storage in Aquifers

摘要:

采用数值模拟方法，以3 MW储能规模为例，建立水平地层埋深800 m、渗透率0.5×10-12 m2的压缩空气地下含水层储能模型，对初始气囊及系统循环过程中压力、气相饱和度、系统循环次数等参数进行分析.结果表明：经历完整一次循环后，地层中压力和气相饱和度变化较小；随着循环的继续，地层中可供储能释能循环的有效气相体积缓慢减少；周循环过程压力变化范围较大，对储能系统要求较高.含水层作为储气库进行压缩空气储能具有可行性，应根据实际地质条件进行相应系统设计.

Abstract:

A concept model for compressed air energy storage system in aquifer (at a depth of 800 m and with a permeability of 0.5×10-12 m2) was designed and investigated through numerical simulations. The pressure variation, gas plume evolution and system cycle times during the formation of initial gas bubble and system daily cycle were analyzed. The modeling results show that there is a small change in pressure and gas saturation after each daily cycle. However, the total effective gas volume in gas bubble decreases with cycle continuing. Makeup gas should be injected into gas bubble during daily cycle or carry out another gas bubble injection after cycle is ceased. The comparisons of daily cycle and weekly cycle scenarios indicate that weekly cycle needs higher requirement for system. Aquifers as storage tank for compressed air energy storage is feasible and should be designed according to the specific geological conditions.