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Flash Atomization: A New Concept to Control Combustion Instability in Water Injected Gas Turbines

[+] Author Affiliations
Vishwas Iyengar, Harold Simmons, David Ransom

Southwest Research Institute® , San Antonio, TX

Thomas Holzschuh

Cogeneration-Kraftwerke Management Steiermark GmbH, Graz, Austria

Paper No. GT2010-22375, pp. 313-322; 10 pages
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 2: Combustion, Fuels and Emissions, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4397-0 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME


The objective of this work is to develop and explore methods to reduce combustor rumble in an industrial gas turbine in co-generation service that is operated with water injection reducing NOX emissions. Attempts to use water injection as a means to reduce NOX emissions in gas turbines have been largely unsuccessful because of increased combustion instability levels experienced. The increase in pulsation causes chronic fretting, wear, and fatigue that damages combustor components resulting in higher operation costs due to repair or replacement of parts. This combustion instability can be tied to the insufficient atomization of injected water; relatively large water droplets evaporate non-uniformly that lead to energy absorption in non-uniform chaotic pulses. This added pulsation is amplified by the combustion process and acoustic resonance. Effervescent atomization, where a gas bubbles are injected with the liquid, is beneficial in producing finely atomized droplets, because the gas bubbles burst as they exit the nozzles creating additional energy to disperse the liquid. A new concept for effervescent atomization dubbed “Flash Atomization” is presented where water is heated to just below its boiling point in the supply line so that some of it will flash to steam as it leaves the nozzle. An advantage of Flash Atomization is that available heat energy can be used rather than mechanical energy to compress injection gas for conventional effervescent atomization.

Copyright © 2010 by ASME



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