Patent ID: 9091274
Filing Date: 2015-07-28
Classification: F04D,Y10T

Abstract:
1. A fluid transport system, comprising: a compressor configured to increase a pressure of a fluid flow passing therethrough; an anti-surge flow recirculation loop configured to selectively redirect, using an anti-surge valve, a part of the fluid flow passing through the compressor from a discharge output of the compressor to an input of the compressor; and a controller connected to the anti-surge flow recirculation loop and the compressor, and configured to: (i) detect a surge event by detecting a beginning of the surge event based on decreasing discharge pressure, the rate of the discharge pressure, and the rate of change of the rate of the discharge pressure in the compressor using a sensor; (ii) monitor the discharge pressure until the discharge pressure decreases below an expected low discharge pressure value; and then (iii) after the discharge pressure has decreased below the expected low discharge pressure value, detect an end of the surge event when the rate of the discharge pressure becomes positive; and (iv) relocate a surge margin characterizing an operation of the fluid transport system; (v) issue a relocate alarm, when the surge margin is changed.