Patent ID: 7797921
Filing Date: 2010-09-21
Classification: F02C,Y02E

Abstract:
1. A control apparatus of an extracted air booster system of an integrated gasification combined cycle power plant, the extracted air booster system including an extracted air booster for pressurizing air extracted from a compressor driven by a gas turbine, and for supplying the extracted air to a gasification furnace; an inlet guide vane provided to an inlet side of the extracted air booster; and an antisurge valve for returning the extracted air from an outlet side of the extracted air booster to the inlet side of the extracted air booster, the control apparatus comprising: a first control section for performing pressure control in which a degree of opening of the inlet guide vane is controlled based on a pressure deviation between a set pressure value and an outlet pressure detection value of the extracted air booster so that the outlet pressure detection value can become equal to the set pressure value, the outlet pressure detection value being detected by a first pressure detector; and a second control section for performing antisurge control in which a degree of opening of the antisurge valve is controlled based on a pressure ratio deviation between a set pressure ratio value and a pressure ratio of the outlet pressure detection value of the extracted air booster to an inlet pressure detection value of the extracted air booster so that the pressure ratio can become equal to the set pressure ratio value, the outlet pressure detection value being detected by the first pressure detector and the inlet pressure detection value being detected by a second pressure detector, wherein when the inlet guide vane is fully closed or has a small opening degree equal to or smaller than a predetermined opening degree, based on the pressure deviation, the second control section performs pressure control in which the degree of opening of the antisurge valve is controlled so that the outlet pressure detection value can become equal to the set pressure value, instead of or as well as the antisurge control.