基于气动马达的微型压缩空气储能系统的试验研究

Experimental study on a micro-compressed air energy storage system based on a pneumatic motor

压缩空气储能具有寿命长、成本低、环境污染小等优点而备受关注,然而压缩空气储能系统存在能量密度和效率低的问题,本工作提出了气动马达并联工作模式以提高压缩空气储能系统的输出功率、能量转换效率和经济性。通过对比分析了在气动马达并联工作和单独工作时,关键参数变化对气动马达输出功率、经济性和能量转换效率的影响规律。为了将微型压缩空气储能系统的膨胀机和压缩机一体化,本工作研究了气动马达正转和反转的性能。气动马达既作为膨胀机又作为压缩机,可以双模式运行,提高设备的利用率,降低压缩空气储能系统的成本。与可再生能源发电相结合的应用场景中,变工况运行是压缩空气储能系统面临的一个关键问题。以储气罐压力变化和负荷需求波动为代表的多种变工况条件在系统运行过程中常常同时存在,本工作在变工况条件下,通过试验研究了关键因素对压缩空气储能系统性能的影响情况。试验结果表明,采用气动马达并联工作模式可以提高压缩空气储能系统的输出功率、能量转换效率和经济性。当进气压力为10.5 bar(1 bar=100 kPa)时,气动马达和发电机输出功率的最大值约为660 W和380 W。

A compressed air energy storage(CAES)system has gained attention due to its advantages of long life,low cost,and low environmental pollution.However,the CAES system is faced with low energy density and efficiency.Herein,the parallel operation mode of pneumatic motors is proposed to improve the power output of the CAES system.The output performance,economic performance,and energy conversion efficiency of CAES with the key parameters are compared and analyzed when the pneumatic motor works in parallel or alone mode.The purpose of studying the forward and reverse performance of the pneumatic motor is to integrate the expander and compressor of the micro CAES system.It was observed that the pneumatic motor could operate in two modes to improve energy utilization efficiency.In the application scenario,combined with renewable energy power generation,the off-design operation is another critical problem faced by the CAES system.The changes in air tank pressure and load demand fluctuation represent various off-design conditions.Herein,the influence of key parameters on the performance of the CAES system is investigated via experiments under off-design conditions and improved by adopting the parallel operation mode of pneumatic motors.When the intake pressure is 10.5 bar,the maximum power output of the pneumatic motor and generator is approximately 660 and 380 W,respectively.