Some problem of centrifugal compressors upgrading

Nikolai Sadovskiy,Mikhail Sokolov,Leonid Strizhak,Anatoliy Simonov,A Borodinecs,V Sergeev,N Vatin

doi:10.1051/matecconf/201824509004

Nikolai Sadovskiy, Mikhail Sokolov + Show 5 more

Open Access

https://doi.org/10.1051/matecconf/201824509004

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Abstract

The results of computational investigation of the influence of a gas labyrinth seals, oil end seals with floating rings and oil journal bearings lubricating layer stiffness coefficient on centrifugal compressor rotor critical speed are presented and analysed. The main principles of a method for axial forces acting on centrifugal compressor rotor calculation are listed. The method has been developed at the compressor, vacuum and refrigeration technologies department of SPbSTU. In addition, the estimation of method applicability in engineering calculations is given.

Highlights

IntroductionThere is an intensive modernization of existing natural gas superchargers
At present, there is an intensive modernization of existing natural gas superchargers
Calculation of axial forces is performed for three rotor circuits: 1. A rotor with a one-sided arrangement of the Imp, a dummy and with a bypass line connecting the cavity behind the dummies with the suction chamber of the first stage

Summary

Introduction

There is an intensive modernization of existing natural gas superchargers. The flow parts are changed in order to increase their efficiency For this purpose, low-pressure impellers (Imp) are often used, i.e. Impellers with smaller (in comparison with conventional Imp) coefficients of theoretical head and, with a greater degree of reactivity. Low-pressure impellers (Imp) are often used, i.e. Impellers with smaller (in comparison with conventional Imp) coefficients of theoretical head and, with a greater degree of reactivity In such cases, while maintaining the final parameters of the compressor, it becomes necessary to increase the rotor speed, the length of the Imp diameter D2, or the number of stages. Reliability of axial forces determination for multistage centrifugal compressors is the key to their reliable and trouble-free operation. There is no universal method for calculating axial forces for centrifugal compressors. The development of the proposed method is a continuation of the work aimed at expanding the capabilities of computational methods for determining the axial forces with acceptable accuracy

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