Abstract: In view of the single working condition of the performance curve of centrifugal compressors, it is difficult to adjust the working condition directly according to the curve in actual operation, and it is not convenient to carry out the operation optimization work. The performance curve and optimization measures of centrifugal compressor were studied. Taking a compressor station of Yuji pipeline as an example, the main performance parameters and calculation formulas of centrifugal compressor were analyzed; and the performance curves of energy head, power and variable efficiency were obtained by using the similarity criteria and curve fitting method; then the obtained performance curves were compared with the actual situation. The results indicate that the relative error between the actual energy head and the fitting energy head was within 2 ‰, which verified the accuracy of the fitting curve. The relationship curves of energy head, variable efficiency, pressure ratio and flow rate under different working conditions were obtained by adopting software programming. The changing law of the curves was analyzed, and the operation optimization measures under different working conditions were obtained.

Key words: long-distance pipeline, centrifugal compressor, performance curve, operation, optimization measures