天然气管道典型离心压缩机性能预测研究

Study on Performance Prediction of Centrifugal Natural Gas Compressors

开发了一款能够实时精确预测生产现场天然气压缩机实际运行性能的应用软件。依据BWRS气体状态方程开发了天然气多组分物性计算程序,利用该程序计算的天然气密度等物性数据与国外压缩机厂家提供数据一致;根据流体力学相似原理构建了各种压比下压缩机性能换算模型,并用该模型预测中石化天然气川气东送管道上下游多台GE PCL503型压缩机的性能。以现场多组具代表性实际工况运行数据为验证样本,结果发现,模型结果与样本实验数据吻合良好,表明本模型预测准确,所开发的软件能够即时给出各种实际工况下准确的压缩机性能参数,对现场压缩机生产运行调度有较好的指导意义。

This paper aims at developing a real-time application software that can give the prediction performance result of centrifugal natural gas compressors. Firstly a program of natural gas multi components properties is built up based on Benedict-Webb-Rubin-Starling （BWRS） equations. Afterwards the correctness of the program is validated by comparing its results with the manufactured data offered by GE Company. Then a performance prediction model of centrifugal natural gas compressors based on similarity conversion that is robust for all pressure ratios is proposed. Finally, the accuracy of the model is verified by typical experimental data of several GE PCL 503 compressors in Sichuan to Eastern China gas Transmission Company. It is found out that good agreement is observed between the predict results and experimental results, which indicates that the model has good practicability. The present work is meaningful and can serve as a guide for production management of gas compressors in the work site.