Variable-working-condition side-flowing compressor operation space determining method and system

Abstract

The invention discloses a variable-working-condition side-flowing compressor operation space determining method and system. The method comprises performing calculation according to a preset mass flow formula and preset parameters obtained through measurement elements in a side-flowing compressor and obtaining side-flowing compressor second-stage actual mass flow values according to a mass conservation principle; obtaining the side-flowing compressor second-stage actual inlet temperature according to the heat conservation principle ad a first preset formula; obtaining the simplified flow square to outlet pressure ratio according to preset side-flowing compressor second-stage flow coefficients and a preset normalization formula, and obtaining a normalization side-flowing compressor operation and control curve by simplifying the flow square to outlet pressure ratio; obtaining side-flowing compressor operation space through a second preset formula according to side-flowing compressor second-stage actual work condition parameters. By the aid of the method and the system, the safety and operation efficiency of side-flowing compressors can be controlled and improved.

Description

technical field [0001] The invention relates to the field of compressor control, in particular to a method and system for determining the operating space of a side flow compressor operating under variable working conditions. Background technique [0002] Side-stream compressors generally adopt a multi-stage compression method, which can be mainly divided into two types: reactive side-stream applications and refrigeration-type side-stream applications. [0003] At present, the domestic anti-surge control of side-stream compressors only adopts a simple flow calculation method based on mass conservation. However, this anti-surge control method based on mass flow has a control effect only when the compressor is used under the calibrated working condition. However, when the operating conditions of the compressor change, such as during the start-up stage, or when the inlet conditions of the corresponding section of the compressor change significantly due to the problem of upstrea...

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Problems solved by technology

However, this anti-surge control method based on mass flow has a control effect only when the compressor is used under the calibrated working condition.

However, when the operating conditions of the compressor change, such as during the start-up stage, or when the inlet conditions of the corresponding section of the compressor change significantly due to the problem of upstream process equipment that will cause a decrease in production, this fixed mass flow rate based The calculation of the anti-surge flow rate under working conditions will lead to a large calculation deviation, resulting in misoperation or refusal to operate the anti-surge control and protection. On the one hand, it will affect the safe operation of the equipment. Opening the backflow valve to increase the backflow flow will cause high energy consumption and waste

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