基于误差修正模型的压缩机组性能预测

Prediction of Compressor Unit Performance Based on Error Correction Model

针对前期制定的压缩机组运行方案不切实际的问题,开展了离心压缩机性能预测研究。采用误差修正的思想,以某压气站离心压缩机组为研究对象,运用多变换算法对压缩机组性能曲线进行换算,然后,基于最小二乘法曲面拟合原理对经过相似变换后的性能曲线进行拟合。考虑到压缩机组的劣化情况,运用最小二乘法一元拟合原理获得了性能参数的误差修正模型,并与不同工况下的多组历史数据进行对比分析,由误差修正模型得到的轴功率、压比预测值与其实测值的相对误差在3%以内,验证了误差修正模型的可靠性,为压缩机组运行方案的制定提供了切合实际的生产运行基础数据。

To resolve the problem of unrealistic operation plans developed at the early stage for centrifugal compressors,this study was conducted to predict the performance of centrifugal compressors.For the purpose of error correction and taking a centrifugal compressor unit of a specific compressor station as an example,we transformed the performance curve of the compressor unit using a multi-transformation algorithm.Subsequently,the performance curve as processed through similarity transformation was fitted based on the method of least-square surface fitting.Considering the deterioration of the compressor unit,an error correction model of the compressor performance parameters was obtained through least-squares one-element fitting.A comparative analysis was further performed between the model and multiple sets of historical data obtained under different working conditions.The results showed that the relative error of the shaft power and the pressure ratio prediction obtained from the error correction model was within 3%when compared to the actual measurement values.This finding validates the reliability of the proposed error correction model.It further provides realistic basic production data for developing a proper operating plan for a compressor unit.