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Kinetic study of combustion behavior in a gas turbine - Influence from varying natural gas composition

Tillmark, Catharina (2006)
Department of Energy Sciences
Abstract
The purpose of the numerical study was to investigate the influence of

three different natural gas compositions on the combustion behaviour of

an Advanced Environmental Vortex (AEV) burner. The flow conditions

apply to the AEV burners installed in the Siemens gas turbine SGT-800.

Numerical simulations were carried out using the software Chemkin

4. Ignition temperatures, adiabatic flame temperatures, NOX emissions

and laminar flame speeds were determined using models included in the

software.

To find suitable reaction mechanisms for the simulations a mechanism

study was made. The behaviour of the mechanisms was studied burning

methane and ethane. The two reaction mechanisms chosen for the simulations represent combustion of... (More)
The purpose of the numerical study was to investigate the influence of

three different natural gas compositions on the combustion behaviour of

an Advanced Environmental Vortex (AEV) burner. The flow conditions

apply to the AEV burners installed in the Siemens gas turbine SGT-800.

Numerical simulations were carried out using the software Chemkin

4. Ignition temperatures, adiabatic flame temperatures, NOX emissions

and laminar flame speeds were determined using models included in the

software.

To find suitable reaction mechanisms for the simulations a mechanism

study was made. The behaviour of the mechanisms was studied burning

methane and ethane. The two reaction mechanisms chosen for the simulations represent combustion of hydrocarbons with up to two carbon atoms

and seven carbon atoms. The reaction mechanisms are developed by Danmarks tekniske universitet and Lawrence Livermore National Laboratory

respectively.

The simulations gave the following results. The ignition temperature

differed up to 80 K and the adiabatic flame temperature up to 30 K

between the gases. The highest NOX emissions were obtained at =0.95

and increased with the residence time. The largest difference in laminar

flame speed was 10 cm/s.

The conclusion from the results when applied to the conditions in the

AEV burner is that the difference in gas composition does not influence the

performance of the burner noticeably. However some differences in NOX

emissions are noticed but since NOX emissions are difficult to predict the

levels of the emissions are to be treated with caution. (Less)
Please use this url to cite or link to this publication:
author
Tillmark, Catharina
supervisor
organization
year
type
H1 - Master's Degree (One Year)
subject
keywords
natural gas, combustion, gas turbines, naturgas, förbränning, gasturbiner, Energy research, Energiforskning
language
English
id
1327403
date added to LUP
2006-07-05
date last changed
2006-07-05
@misc{1327403,
  abstract     = {The purpose of the numerical study was to investigate the influence of

three different natural gas compositions on the combustion behaviour of

an Advanced Environmental Vortex (AEV) burner. The flow conditions

apply to the AEV burners installed in the Siemens gas turbine SGT-800.

Numerical simulations were carried out using the software Chemkin

4. Ignition temperatures, adiabatic flame temperatures, NOX emissions

and laminar flame speeds were determined using models included in the

software.

To find suitable reaction mechanisms for the simulations a mechanism

study was made. The behaviour of the mechanisms was studied burning

methane and ethane. The two reaction mechanisms chosen for the simulations represent combustion of hydrocarbons with up to two carbon atoms

and seven carbon atoms. The reaction mechanisms are developed by Danmarks tekniske universitet and Lawrence Livermore National Laboratory

respectively.

The simulations gave the following results. The ignition temperature

differed up to 80 K and the adiabatic flame temperature up to 30 K

between the gases. The highest NOX emissions were obtained at =0.95

and increased with the residence time. The largest difference in laminar

flame speed was 10 cm/s.

The conclusion from the results when applied to the conditions in the

AEV burner is that the difference in gas composition does not influence the

performance of the burner noticeably. However some differences in NOX

emissions are noticed but since NOX emissions are difficult to predict the

levels of the emissions are to be treated with caution.},
  author       = {Tillmark, Catharina},
  keyword      = {natural gas,combustion,gas turbines,naturgas,förbränning,gasturbiner,Energy research,Energiforskning},
  language     = {eng},
  note         = {Student Paper},
  title        = {Kinetic study of combustion behavior in a gas turbine - Influence from varying natural gas composition},
  year         = {2006},
}