Patent ID: 6694745
Filing Date: 2004-02-24
Classification: F02C

Abstract:
A method for running up a gas turbine plant, in which at least one fuel is burnt in a combustion chamber and the hot combustion gases occurring at the same time are led through a gas turbine and thereafter discharged as exhaust gases, in which method the at least one fuel is injected into the combustion chamber via a plurality of pilot burners and premix burners, the gas turbine being run up at a specific load gradient, and the combustion chamber being operated in the pilot mode during the start-up and in a lower load range, and, at a specific time point, the combustion chamber being changed over from the pilot mode to the premix mode, the changeover time point being dependent on a predetermined exhaust-gas temperature, wherein(a) the changeover time point from the pilot mode to the premix mode depends on a variable changeover temperature and this changeover temperature is determined from pulsations occurring in the flame of the combustion chamber, while (b) the gas turbine plant is run up at a constant load gradient and the changeover is initiated without the occurrence of pulsations, in so far as an upper maximum changeover temperature is reached, and, (c) when pulsations occur, the load gradient is lowered and the changeover is initiated, in so far as a lower minimum changeover temperature is reached, and, (d) when further pulsations occur, at a specific exhaust-gas temperature, the changeover is initiated, as soon as a variable changeover temperature exceeds the lower minimum changeover temperature, the variable changeover temperature being determined from the exhaust-gas temperature by reduction by a specific amount, and, (e) in so far as the variable changeover temperature does not reach the lower minimum changeover temperature, the gas turbine plant is operated for a specific time at an exhaust-gas temperature below the exhaust-gas temperature at which pulsations occur, and, thereafter, (f) the gas turbine plant is further acted upon at the lowered load gradient according to (c).