Dynamic Adaptation of the Air Split of a Gas Turbine Combustion Chamber for a Hybrid Energy System Application

Kurzfassung

In this paper, the functionality of a newly designed orifice is investigated. The orifice is used to adjust the air split inside a gas turbine combustion chamber. Via this adjustment, the local air fuel ratio and therefore the combustion properties and emissions of a gas turbine can be optimized. This leads to many advantages in the stand-alone gas turbine operation. It enables the gas turbine to operate at an optimized air fuel ratio for all operating points, which especially benefits part load operating points, with normally relatively lean combustion conditions. With that, it is possible to enlarge the operating range of gas turbines. In operation regimes, where lean blow off occurs or the combustion conditions are unfavorable, an adaptation of the primary combustion air mass flow can be used to stabilize the flame and enable stable and clean gas turbine combustion. In addition to that, the orifice enables a broader fuel flexibility, since the local airsplit ratio can be adapted to the respective fuels. Additionally, it enables the integration of energy storage systems, such as high temperature energy storages, into the gas turbine system, which require the air split adjustment to fully utilize their advantages. Therefore, to research the operability of this orifice, an experimental investigation of such a hybrid energy system is carried out, to proof the impact of the orifice on the air split and the gas turbine operation and emissions.