Compressor control method and system

摘要

A compressor control method includes providing variable aerodynamic sizing of fluid flow through a compressor at multiple operating points of the compressor. A head is determined for an operating point, based on a process input at that operating point. Further, for that operating point, a control pressure number is determined as a function aerodynamic flow sizing at that operating point. The control pressure number is determined a function of the head divided by the square of a tip speed of the impeller of the compressor. An operating speed setpoint is determined based on the determined head and control pressure number.

主权项

1. A control method for a compressor, comprising:
providing variable aerodynamic sizing of fluid flow through the compressor at a plurality of operating points of the compressor, for an operating point of the plurality of operating points, determining a head of the compressor based on a process input at the operating point, for the operating point of the plurality of operating points, determining a pressure number as a function of aerodynamic flow sizing at the operating point, and determining, by a control device of the compressor, an operating speed setpoint of the compressor based on the determined head and pressure number, wherein the compressor comprises a rotating impeller having a tip rotating at a tip speed, wherein the pressure number is a function of the head divided by the square of the tip speed, controlling shaft rotational speed of the compressor using the determined operating speed setpoint, based on a closed loop feedback control mechanism, wherein the process input includes a measured compressor inlet temperature, and wherein the process input includes a compressor discharge pressure, further wherein the head is determined based on a pressure surge margin added to the compressor discharge pressure.