压缩空气储能系统用多级离心压缩机进口导叶调节策略研究

Adjustment Strategy of Inlet Guide Vane of Multistage Centrifugal Compressor Applied in CAES

压缩空气储能系统在储能过程中,储气装置内部压力不断升高,这要求压缩机在较大压比范围内工作。高效变工况是压缩空气储能系统中压缩机的核心要求,为实现这个设计目标需要采取合适的调节方式及其调节策略。可调进口导叶结构简单,可在工作过程中运行,并可利用伺服装置实现自动化,是目前压缩空气储能系统中压缩机最适合的调节方法之一。本文以压缩空气储能系统中某4级离心压缩机为研究对象,建立了一种适用于多级离心压缩机变工况调节的性能预测方法,采用数值模拟得出单级离心压缩机性能曲线,并编写级性能叠加程序获得整机性能曲线。利用最小二乘法将多级离心压缩机性能数据拟合为多项式函数,采用遗传算法建立了以等熵效率为优化目标,进口导叶开度为优化变量,整机出口压力或者流量为约束条件的可调进口导叶调节策略程序。

In the process of compressed air energy storage system working,the internal pressure of the gas storage device continues to rise,which requires the compressor to work in a wide pressure ratio range.High efficiency variable operating condition is the core requirement of compressors in compressed air energy storage system.In order to achieve this design goal,it is necessary to adopt appropriate adjustment methods and adjustment strategies.The adjustable inlet guide vane is simple in structure,can be operated in the working process,and can be automated by the servo device,which is one of the most suitable adjustment methods for the compressor in the compressed air energy storage system.This paper takes a 4-stage centrifugal compressor in compressed air energy storage system as the research object,and establishes a performance prediction method suitable for the multi-stage centrifugal compressor under varying working conditions.The performance curve of the single-stage centrifugal compressor is obtained by numerical simulation,and the performance superposition program of the stage is written to obtain the performance curve of the whole machine.The performance data of multistage centrifugal compressor is fitted to polynomial function by least square method,and the adjustable inlet guide vane adjustment strategy program is established by genetic algorithm with isentropic efficiency as optimization objective,inlet guide vane opening as optimization variable and outlet pressure or flow of the whole machine as constraint conditions.