基于变效率压气机的AA-CAES变工况性能分析

Off-Design Performance Analysis of AA-CAES Based on Variable Efficiency Compressor

先进绝热压缩空气储能系统(advanced adiabatic compressed air energy storage system,AA-CAES)是一种清洁、环保的大规模储能技术,能够为可再生能源并网及电网调峰提供新的解决方案。为了深入研究压气机模型对变工况下AA-CAES系统运行性能的影响,本文在传统模型的基础上添加了压气机效率模型。求解系统模型发现:相对于储气室最高压比,换热器效能对储能效率的影响较大,换热器效能每提高0.05,储能效率平均提高2.9%;随着储气室最高压比的上升,储能密度近似呈线性增加;AA-CAES系统在储能阶段,稳定运行的前两级压气机功率保持不变,非稳定运行的第3级压气机功率随储气室压比的升高而逐渐增大,储能阶段结束时第3级压气机耗功最多。

Advanced adiabatic compressed air energy storage system（ AA-CAES） is a clean and environmentallyfriendly large-scale energy storage technology,which provides a new solution for renewable energy grid and power peaking.In order to accurately study the impact of compressor on the operating performance of AA-CAES system under variable condition,this paper adds a compressor efficiency model to the traditional model. The results show that compared with the maximum pressure ratio of the gas storage room,the efficiency of heat exchanger has a great influence on the energy storage efficiency. As the heat exchanger efficiency increases by 5 percent,there＇s an average growth of 2. 9% in storage efficiency. The energy density increases linearly with the increased gas storage maximum pressure ratio. During the energy storage stage,the power of the former two-stage compressor in AA-CAES system which operates stably is unchanged,but the power of the third unstable compressor is gradually increased with the gas storage pressure ratio,and the third stage compressor consumes the most energy at the end of the process.