Single-shaft CO2 compressor tail section model stage with flow coefficient being 0.0056 and impeller design method

Abstract

The invention discloses a single-shaft CO2 compressor tail section model stage with the flow coefficient being 0.0056 and an impeller design method and mainly aims to improve the efficiency of a CO2 compressor unit, reduce power consumption of the CO2 compressor unit, ensure the effect that a compressor is wide in working condition range and improve the stability of a rotor at the same time. The model stage comprises an impeller, a blade diffuser, a bend and a return device, wherein the impeller is a low-friction-resistance wedge-shaped impeller designed according to specific blade thickness reference; the impeller is located at an inlet of the model stage; the impeller diffuser is arranged at an outlet of the impeller; the return device is located at an outlet of the model stage; the blade diffuser communicates with the return device through the bend; and the machine Mach number Mu2 of the model stage ranges from 0.6 to 0.9, the flow coefficient phi1 is equal to 0.0056, the design point energy head coefficient Tau is equal to 0.61, the polytropic efficiency Etapo1 of all Mach numbers ranges from 0.64 to 0.645, and the application flow range is 75%-146% of design points.

Description

technical field [0001] The invention relates to the field of model stage design, in particular to a method for designing a model stage and an impeller at the end stage of a single-shaft CO2 compressor with a discharge coefficient of 0.0056. Background technique [0002] The development of modern centrifugal compressors is mostly based on user needs, based on the existing model-level database, and uses similarity theory to design schemes. Therefore, the pros and cons of model-level design directly affect the performance of the entire product. As an important part of the urea synthesis plant, the CO2 compressor unit has become one of the most technologically advanced and most important products of major compressor manufacturers because of its high working pressure and high density. [0003] At present, the flow coefficients of the stages behind the high-pressure cylinder of the CO2 compressor are very small, and some flow coefficients Φ 1 It can even go to 0.004 or lower. H...

AI Technical Summary

Problems solved by technology

However, the variable efficiency of this small flow coefficient model stage is generally lower than 60%, which is far from meeting the needs of the market

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