| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To suppress the rise of the exhaust gas temperature of a high-pressure turbine when the interruption of load occurs on the steam turbine generator of a multi-shaft type combined cycle power generating plant. <P>SOLUTION: When the interruption of a load occurs, one of a plurality of gas turbine units is selected as a preference gas turbine unit, and a main steam isolation valve and a reheat steam isolation valve of the non-preference gas turbine units are fully closed. With the fully closed states of exhaust isolation valves held, high-pressure and low-pressure turbine bypass valves are opened. Only main steam and reheat steam generated from an exhaust heat recovery boiler of the preference gas turbine unit are allowed to flow into the high- pressure and low-pressure turbines to hold the number of rotations at a rated one. The exhaust steam from the high-pressure turbine is also allowed to flow into the preference gas turbine unit and the non-preference gas turbine units through the exhaust isolation valves. <P>COPYRIGHT: (C)2003,JPO</p> |
