Control method and control system for turbine compressors operated in parallel

Abstract

The invention discloses a control method and a control system for turbine compressors operated in parallel. The system comprises a load balance control part, a performance control part and an anti-surge control part. The method comprises the steps that the surge control deviation is calculated, according to the surge control deviation of all the units in a compression station and the average surgecontrol deviation, automatic load distribution of the units is achieved, the performance control and the load balance control are adopted and combined to control the rotating speed of turbines and the main performance parameters of the units, and the coupling relation between the performance control and the anti-surge control is eliminated. According to the method and the system, through the combined coordination control, the load distribution of the compression station units operated in parallel is optimized, the safety operation of the units is better protected, and the operation efficiencyof the units is maximized.

Description

technical field [0001] The invention relates to the control of parallel-running turbo-compressors, in particular to automatic load balance distribution among multiple parallel-running turbo-compressors in a compression station and coordinated control among control circuits. Background technique [0002] In process industry production, many processes require several units to operate in parallel. For example, in an LNG plant, three propylene compressors may be used, dual-purpose and one standby. If the required flow rate of the process decreases in a large range, one compressor can be stopped; On the natural gas pipeline transmission line, some booster stations should be set up, and each compressor station usually has more than two compressor units running in parallel. In the process industry, where the units need to be operated in parallel, they are all parts that require safe, stable and efficient operation. [0003] The main performance parameters controlled by parallel ru...

AI Technical Summary

Problems solved by technology

Since almost no two units have the same characteristics, this fixed-proportion flow distribution control method is not suitable. For example, in order to maintain a constant outlet pressure, some units are operating at full load, while some units enter surge or reverse flow

[0007] (3) Set the base load unit and the peaking unit, and control the base load unit to operate at the maximum efficiency point. When the process load changes, the peaking unit adjusts the load to meet the needs of the main performance parameters of the compression station. This method is used in It is widely used in actual engineering, but it is not the best in terms of safety and unit energy efficiency.

[0009] However, the parallel operation of the units in the compressor station is prone to unbalanced loading, and there are strong coupling problems between the control circuits, especially the mutual influence between performance control and anti-surge control. Currently, it is mainly operated under manual control mode, and the degree of automation Low, poor control response, serious energy waste and insufficient safety protection

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