Gas turbine combustor and method for operating same

摘要

A gas turbine combustor stably burns low-BTU gases, such as blast furnace gases, that are heavily laden with CO2. The gas turbine combustor includes a double-swirling burner with an inner swirler and an outer swirler, the burner having a configuration with gas fuel injection holes and air injection holes arranged at alternate positions in the inner swirler and with gas injection holes arranged in the outer swirler. In addition, fuel injection holes for enhancing flame stability are provided at positions radially inward of the inner swirler. An inner flame by the inner swirler and an outer flame by the outer swirler interact with each other to stably burn the low-BTU gas. In the inner swirler, the gas injection holes and air injection holes arranged at alternate positions contributes to raising a temperature of the inner flame to a level required for flame stabilization.

主权项

1. A gas turbine combustor comprising:
a combustion chamber for burning a fuel and air in a mixed condition; and a burner, provided upstream in a gas flow direction of the combustor, for supplying the fuel and the air to inside of the combustion chamber and thus stabilizing a flame; wherein the burner includes
a first swirler in which both of a plurality of gas injection holes for injecting the fuel, and a plurality of air injection holes for injecting air are arranged at alternate positions in a circumferential direction of the swirler, anda second swirler circumferentially surrounding an outer periphery of the first swirler, the second swirler being fitted only with a plurality of gas injection holes to inject the fuel, and wherein the plurality of gas injection holes and the plurality of air injection holes are independent flow channels that supply the fuel and the separately to the combustion chamber.