NOx-Formation and CO-Burnout in Water Injected, Premixed Natural Gas Flames at Typical Gas Turbine Combustor Residence Times

[+] Author and Article Information
Stephan Lellek

Lehrstuhl für Thermodynamik Technische Universität München 85748 Garching, Germany

Thomas Sattelmayer

Lehrstuhl für Thermodynamik Technische Universität München 85748 Garching, Germany

1Corresponding author.

ASME doi:10.1115/1.4038239 History: Received July 03, 2017; Revised August 22, 2017


With the transition of the power production markets towards renewable energy sources an increased demand for ?exible, fossil based power production systems arises. In order to further increase gas turbine ?exibility research on power augmentation of premixed gas turbine combustors is conducted at the Lehrstuhl für Thermodynamik, TU München. Water injection in gas turbine combustors allows for the simultaneous control of NOx emissions as well as the increase of the power output of the engine and has therefore been transferred to a premixed combustor at lab scale. This paper focuses on the effects of water injection on pollutant formation in premixed gas turbine ?ames. In order to guarantee for high practical relevance experimental measurements are conducted at typical preheating temperatures and common gas turbine combustor residence times of about 20 ms. Global and local CO and NOx measurements are performed in an atmospheric single burner test rig for typical adiabatic ?ame temperatures and variable water droplet diameters. For rising water content at constant adiabatic ?ame temperature the NOx emissions can be held constant, whereas CO concentrations increase. Local measurements show changes in the distribution of the reaction progress variable and an increase of the ?ame length at water injected operating conditions. Furthermore, changes of the maximum as well as the averaged CO values are found. Finally, a strong in?uence of water droplet size on NOx and CO formation is shown for constant operating conditions.

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