Method and system for determining the operating space of side-stream compressors operating under variable operating conditions

Abstract

The invention discloses a method and system for determining the operating space of a side-flow compressor operating under variable working conditions, including: calculating according to a predetermined mass flow formula and predetermined parameters obtained by measuring elements in a side-flow compressor; and according to the principle of mass conservation Obtain the actual mass flow value of the second stage of the side flow compressor; obtain the actual inlet temperature of the second stage of the side flow compressor according to the principle of heat conservation and the first predetermined formula; according to the predetermined flow coefficient of the second stage of the side flow compressor and The predetermined normalization formula obtains the simplified flow square and the outlet pressure ratio, and the normalized side flow compressor operation and control curve is obtained through the simplified flow square and outlet pressure ratio; according to the actual working conditions of the second stage of the side flow compressor Parameters, using the second predetermined formula to obtain the operating space of the side-stream compressor; the method and system can control and improve the equipment safety and operating efficiency of the side-stream compressor.

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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