METHOD AND DEVICE FOR CONTROLLING THE SPRAYING OF WATER INTO THE FLUE GAS DUCT OF A GAS AND STEAM TURBINE INSTALLATION

摘要

A method for operating a gas and steam turbine installation, wherein the heat contained in the expanded flue gas of the gas turbine is used to generate steam for the steam turbine. If a critical operating state arises, the temperature of the expanded flue gas is reduced by introducing water into the expanded flue gas in the flue gas duct between the gas turbine and the waste-heat steam generator connected downstream with regard to flow, wherein the amount of water to be introduced is determined in dependence on the flue gas temperature. The flue gas temperature is measured before water is introduced into the flue gas, an average combustion temperature of the combustion chamber of the gas turbine is determined from the flue gas temperature, and the amount of water to be introduced is set on the basis of the combustion temperature.

主权项

1. A method for operating a gas and steam turbine installation, in which the heat contained in the expanded flue gas of the gas turbine is used to generate steam for the steam turbine, the method comprising:
reducing the temperature of the expanded flue gas to avoid a critical operating state by introducing water into the expanded flue gas in the flue gas duct between the gas turbine and the waste-heat steam generator connected downstream with regard to flow, wherein the amount of water to be introduced is determined in dependence on the flue gas temperature, measuring at least a first flue gas temperature ahead of the introduction of water into the flue gas with regard to flow, determining an average combustion temperature of the combustion chamber of the gas turbine from the flue gas temperature, and setting the amount of water to be introduced on the basis of the average combustion temperature.