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Experimental Investigations of Lean Stability Limits of a Prototype Syngas Burner for Low Calorific Value Gases

Sigfrid, Ivan LU ; Whiddon, Ronald LU ; Aldén, Marcus LU and Klingmann, Jens LU (2011) ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition 2.
Abstract
The lean stability limit of a prototype syngas burner is

investigated. The burner is a three sector system, consisting

of a separate igniter, stabilizer and Main burner. The

ignition sector, Rich-Pilot-Lean (RPL), can be operated with

both rich or lean equivalence values, and serves to ignite the

Pilot sector which stabilizes the Main combustion sector.

The RPL and Main sectors are fully premixed, while the

Pilot sector is partially premixed. The complexity of this

burner design, especially the ability to vary equivalence

ratios in all three sectors, allows for the burner to be

adapted to various gases and achieve optimal combustion.

The... (More)
The lean stability limit of a prototype syngas burner is

investigated. The burner is a three sector system, consisting

of a separate igniter, stabilizer and Main burner. The

ignition sector, Rich-Pilot-Lean (RPL), can be operated with

both rich or lean equivalence values, and serves to ignite the

Pilot sector which stabilizes the Main combustion sector.

The RPL and Main sectors are fully premixed, while the

Pilot sector is partially premixed. The complexity of this

burner design, especially the ability to vary equivalence

ratios in all three sectors, allows for the burner to be

adapted to various gases and achieve optimal combustion.

The gases examined are methane and a high H2 model

syngas (10% CH4, 22.5% CO, 67.5% H2). Both gases are

combusted at their original compositions and the syngas

was also diluted with N2 to a low calorific value fuel with a

Wobbe index of 15 MJ/m3. The syngas is a typical product of

gasification of biomass or coal. Gasification of biomass can

be considered to be CO2 neutral. The lean stability limit is

localized by lowering the equivalence ratio from stable

combustion until the limit is reached. To get a comparable

blowout definition the CO emissions is measured using a

non-dispersive infrared sensor analyzer. The stability limit is

defined when the measured CO emissions exceed 200 ppm. The stability limit is measured for the 3 gas mixtures at

atmospheric pressure. The RPL equivalence ratio is varied

to investigate how this affected the lean blowout limit. A

small decrease in stability limit can be observed when

increasing the RPL equivalence ratio. The experimental

values are compared with values from a perfectly stirred

reactor modeled (PSR), under burner conditions, using the

GRI 3.0 kinetic mechanism for methane and the San Diego

mechanism for the syngas fuels. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Lean blowout, combustion, burner, syngas, hydrogen
in
ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition
editor
Gokulakrishnan, Ponnuthurai and
volume
2
publisher
American Society Of Mechanical Engineers (ASME)
conference name
ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition
external identifiers
  • other:GT2011-45694
  • scopus:84865461320
ISBN
978-0-7918-5462-4
DOI
10.1115/GT2011-45694
language
English
LU publication?
yes
id
f7881af1-414e-4096-8173-c2a27827a743 (old id 3972251)
date added to LUP
2013-08-16 13:04:14
date last changed
2017-03-05 04:25:14
@inproceedings{f7881af1-414e-4096-8173-c2a27827a743,
  abstract     = {The lean stability limit of a prototype syngas burner is<br/><br>
investigated. The burner is a three sector system, consisting<br/><br>
of a separate igniter, stabilizer and Main burner. The<br/><br>
ignition sector, Rich-Pilot-Lean (RPL), can be operated with<br/><br>
both rich or lean equivalence values, and serves to ignite the<br/><br>
Pilot sector which stabilizes the Main combustion sector.<br/><br>
The RPL and Main sectors are fully premixed, while the<br/><br>
Pilot sector is partially premixed. The complexity of this<br/><br>
burner design, especially the ability to vary equivalence<br/><br>
ratios in all three sectors, allows for the burner to be<br/><br>
adapted to various gases and achieve optimal combustion.<br/><br>
The gases examined are methane and a high H2 model<br/><br>
syngas (10% CH4, 22.5% CO, 67.5% H2). Both gases are<br/><br>
combusted at their original compositions and the syngas<br/><br>
was also diluted with N2 to a low calorific value fuel with a<br/><br>
Wobbe index of 15 MJ/m3. The syngas is a typical product of<br/><br>
gasification of biomass or coal. Gasification of biomass can<br/><br>
be considered to be CO2 neutral. The lean stability limit is<br/><br>
localized by lowering the equivalence ratio from stable<br/><br>
combustion until the limit is reached. To get a comparable<br/><br>
blowout definition the CO emissions is measured using a<br/><br>
non-dispersive infrared sensor analyzer. The stability limit is<br/><br>
defined when the measured CO emissions exceed 200 ppm. The stability limit is measured for the 3 gas mixtures at<br/><br>
atmospheric pressure. The RPL equivalence ratio is varied<br/><br>
to investigate how this affected the lean blowout limit. A<br/><br>
small decrease in stability limit can be observed when<br/><br>
increasing the RPL equivalence ratio. The experimental<br/><br>
values are compared with values from a perfectly stirred<br/><br>
reactor modeled (PSR), under burner conditions, using the<br/><br>
GRI 3.0 kinetic mechanism for methane and the San Diego<br/><br>
mechanism for the syngas fuels.},
  author       = {Sigfrid, Ivan and Whiddon, Ronald and Aldén, Marcus and Klingmann, Jens},
  booktitle    = {ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition},
  editor       = {Gokulakrishnan, Ponnuthurai},
  isbn         = {978-0-7918-5462-4},
  keyword      = {Lean blowout,combustion,burner,syngas,hydrogen},
  language     = {eng},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  title        = {Experimental Investigations of Lean Stability Limits of a Prototype Syngas Burner for Low Calorific Value Gases},
  url          = {http://dx.doi.org/10.1115/GT2011-45694},
  volume       = {2},
  year         = {2011},
}