Method of operating a gas turbine for reduced ammonia slip

摘要

Described herein are methods of operating a gas turbine engine (12) for reduced ammonia slip. An exemplary method (100) includes operating (102) the engine over a range of power output levels; controlling (104) a mass flow of NOx produced in exhaust (19) of the engine to be within 10% over the range of power output levels; and treating (106) the exhaust of the engine in a selective catalytic reduction process (22). In this way, the production of NOx and a corresponding flow of reducing agent (33) utilized in the SCR process remain relatively constant in terms of mass (molar) flow throughout the range of power output levels and ammonia slip is controlled.

主权项

1. A method of operating a gas turbine engine, the method comprising:
operating the gas turbine engine over a range of power output levels; controlling a mass flow of NOx produced in exhaust of the gas turbine engine to be within 10% of a selected NOx mass flow over the range of power output levels; and treating the exhaust of the gas turbine engine in a selective catalytic reduction process, wherein the method further comprises: operating the gas turbine engine over the range of power output levels in a load follow operation mode; controlling the mass flow of NOx produced to be higher than a minimum mass flow of NOx that could be produced over the range of power output levels, such that the mass flow of NOx is stable over the range of power output levels compared to the minimum mass flow of NOx over the range of power output levels; and treating the exhaust of the gas turbine engine in the selective catalytic reduction process with a stable amount of reducing agent proportionate to the stable mass flow of NOx produced over the range of power output levels.