Patent AT516424B1: The Pilot Flame as a Tuneable Thermoacoustic Driver for Combustion Control

The patent about the MethaNull technology is granted. The idea is the precision drive of thermoacoustics for a positive impact on the combustion quality using a pilot burner, and the related method makes use of a siren as an exciter.

At the occasion of the recent publication on our patent AT516424B1 (link EPO/Espacenet, link Austrian Patent Office, link Google patents), here is a brief overview of the invention.

Shake it up  !!! 

Driving precisely the flame turbulence by controlling the thermoacoustics can have positive effects near the lean-blow out limit, and at points where the combustion stability is impaired.

More details can be found in these articles:

  • ASME Turbo Expo 2015: Good Vibes Beat Bad GasOptimisation of support fuel consumption burning low heat value gas using controlled combustion oscillations. Giuliani., F., Moosbrugger, V., Stuetz, M. and Leitgeb-Simandl T.  Proceedings of ASME Turbo Expo 2015, June 15-19, 2015, Montreal, Canada. GT2015-42377.
  • ASME Turbo Expo 2017: Make Combustion Great Again!!!! Improvement of impaired combustion conditions at some off-design operation by driving a precisely controlled modulation of the burner air feed. Giuliani, F., Pfefferkorn, L., and Kraft, G. E., 2017. In Proceedings of ASME Turbo Expo, Charlotte, North Carolina, USA. GT2017-64429.

One key technology in this process is CBOne's siren, a powerful and precise flow modulator able to autotune and maintain the desired flame pulsation, even with operation transients. Read more about the siren with our latest ASME Turbo Expo publication, to be released in the early summer 2020.

  • Progress on forcing pulsation for acoustic, thermoacoustic or flow control purpose in a pressurised vessel by means of a siren. F. Giuliani, M. Stuetz, N. Paulitsch, L. Andracher. In Proceedings of the ASME 2020 Turbo Expo, London, UK, June 2020. GT2020-16015 

At this point, we would like to thank our research contributors, the AWS and the FFG, as well as our dear Clients who helped us through their queries to improve this technology with time.