Gas turbine with improved part load emissions behavior

摘要

In a method for the low-CO emissions part load operation of a gas turbine with sequential combustion, the opening of the row of variable compressor inlet guide vanes is controlled depending on the temperatures of the operative burners of the second combustor and simultaneously the number of operative burners is kept at a minimum. This leads to low CO emissions at partial load of the gas turbine.

主权项

1. A method for low-CO emissions operation of a gas turbine with sequential combustion, wherein the gas turbine includes a first turbine, a second turbine, at least one compressor wherein the at least one compressor includes a row of variable compressor inlet guide vanes, a first combustor which is connected downstream to the compressor and the hot gases of which are admitted to the first turbine, and a second combustor which is connected downstream to the first turbine and the hot gases of which are admitted to the second turbine, the second combustor including operative burners each having a burner exhaust temperature, the method comprising:
controlling a position of the variable compressor inlet guide vanes depending on a burner exhaust temperature of at least one the operative burners of the second combustor; in case of increasing loads, switching “ON” a further operative burner of the second combustor in case an average of the turbine exhaust temperature of the second turbine reaches a lower limit value; in case of decreasing loads switching “OFF” one of the operative burners of the second combustor in case the average of the turbine exhaust temperature of the second turbine reaches the lower limit value; and at least one of: controlling the position of the variable compressor inlet guide vanes depending on a difference between the highest burner exhaust temperature of the operative burners and a maximum turbine exhaust temperature;
opening the variable compressor inlet guide vanes when the burner exhaust temperature of one of the operative burners reaches or exceeds the maximum turbine exhaust temperature; andclosing the variable compressor inlet guide vanes when the highest burner exhaust temperature of the operative burners is below the maximum turbine exhaust temperature.