0
research-article

Optical measurements of a lcv-combustor operated in a micro gas turbine with various fuel compositions

[+] Author and Article Information
Timo Zornek

German Aerospace Center (DLR), Institute of Combustion Technology, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
timo.zornek@dlr.de

Thomas Mosbach

German Aerospace Center (DLR), Institute of Combustion Technology, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
thomas.mosbach@dlr.de

Manfred Aigner

German Aerospace Center (DLR), Institute of Combustion Technology, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
manfred.aigner@dlr.de

1Corresponding author.

ASME doi:10.1115/1.4040908 History: Received June 26, 2018; Revised July 10, 2018

Abstract

A FLOX®-combustion system was developed to couple a fixed-bed gasifier with a micro gas turbine. The two-staged combustor consists of a jet-stabilized main stage adapted from the FLOX®-design combined with a swirl stabilized pilot stage. It was operated in a Turbec T100 test rig using an optically accessible combustion chamber, which allowed OH*-chemiluminescence and OH-PLIF measurements for various fuel compositions. In particular, the hydrogen content in the synthetically mixed fuel gas was varied from 0 % to 30 %. The exhaust gas composition was additionally analysed regarding CO, NOx and unburned hydrocarbons. The results provide a comprehensive insight into the flame behaviour during turbine operation. Efficient combustion and stable operation of the Turbec T100 was observed for all fuel compositions, while the hydrogen showed a strong influence. It is remarkable, that with hydrogen contents higher than 9 % no OH radicals were detected within the inner recirculation zone, while they were increasingly entrained below hydrogen contents of 9 %. Without hydrogen, the inner recirculation zone was completely filled with OH radicals and the highest concentrations were detected there. Therefore, the results indicate a different flame behaviour with low and high hydrogen contents. Although the flame shape and position was affected, pollutant emissions remained consistent below 10 ppm based on 15 % O2. Only in case of 0 % hydrogen, CO emissions increased to 43 ppm, which is still meeting the emission limits. Thus, the combustor allows operation with low calorific syngases having hydrogen contents from 0 % to 30 %.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In