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Humidification Processes in Gas Turbine Cycles

Thern, Marcus LU (2005)
Abstract
The global climate change caused by emissions of greenhouse gases from combustion processes has been recognized as a continuously growing problem and much research focuses on improving the environmental performance of gas turbines. The potential of improving gas turbine component efficiencies has become smaller each decade and therefore, thermodynamic cycles have become more interesting for power producing units. One of these cycles is the evaporative gas turbine cycle, also known as the humid air turbine.



This thesis presents a theoretical model developed for the humidification tower in an evaporative gas turbine. The developed theoretical model has been validated with measurements from experiments conducted in a 600... (More)
The global climate change caused by emissions of greenhouse gases from combustion processes has been recognized as a continuously growing problem and much research focuses on improving the environmental performance of gas turbines. The potential of improving gas turbine component efficiencies has become smaller each decade and therefore, thermodynamic cycles have become more interesting for power producing units. One of these cycles is the evaporative gas turbine cycle, also known as the humid air turbine.



This thesis presents a theoretical model developed for the humidification tower in an evaporative gas turbine. The developed theoretical model has been validated with measurements from experiments conducted in a 600 kWe pilot plant. This thesis presents the installation of a plate heat exchanger in the pilot plant. The experience from the pilot plant is used in a comparative study. This study evaluates the influence of the aftercooler on the performance of the evaporative gas turbine. A test facility for evaporation processes at elevated pressures and temperatures have been built. Evaporation of binary mixtures into a compressed air stream has been performed.



Experimental studies with the pilot plant have revealed that it is possible to use a plate heat exchanger as aftercooler in the evaporative gas turbine. The pressure drop on the air side in the aftercooler has been experimentally determined to 1.6% and the pinch-point to 0.1°C. The reconstruction of the pilot plant from a simple cycle to an evaporative cycle has resulted in an increase in thermal efficiency from 21% to 35%. A theoretical model has been developed for the humidification process that predicts the height of the humidification column with an error of 10?15%. Thermodynamic analysis of the bio-EvGT has been performed which have showed that the bio-EvGT cycle has an optimum efficiency of 34%. Further thermodynamics analysis has indicated that the bio-EvGT is a viable alternative to the biomass fueled steam turbine cycle. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • Associate Professor Martin, Andrew, Department of Energy Technology, Royal Institute of Technology, Stockholm
organization
publishing date
type
Thesis
publication status
published
subject
keywords
applied thermodynamics, Thermal engineering, Energiforskning, Energy research, HAT, Biomass, Biofuel, Humidification, Evaporation, 'Evaporative gas turbine', 'Humid air turbine', Termisk teknik, termodynamik
pages
250 pages
publisher
Division of Thermal Power Engineering Department of Energy Sciences Faculty of Engineering Lund University
defense location
Room M:B, M-huset, Ole Römers Väg 1, Lund Institute of Technology
defense date
2005-12-12 10:15
external identifiers
  • other:ISRN:LUTMDN/TMHP-05/1035-SE
ISSN
0282-1990
ISBN
91-628-6696-6
language
English
LU publication?
yes
id
31b7a080-4bcc-4b39-b8ce-db3d455f1f3d (old id 545807)
date added to LUP
2007-09-10 14:42:39
date last changed
2016-09-19 08:44:54
@phdthesis{31b7a080-4bcc-4b39-b8ce-db3d455f1f3d,
  abstract     = {The global climate change caused by emissions of greenhouse gases from combustion processes has been recognized as a continuously growing problem and much research focuses on improving the environmental performance of gas turbines. The potential of improving gas turbine component efficiencies has become smaller each decade and therefore, thermodynamic cycles have become more interesting for power producing units. One of these cycles is the evaporative gas turbine cycle, also known as the humid air turbine.<br/><br>
<br/><br>
This thesis presents a theoretical model developed for the humidification tower in an evaporative gas turbine. The developed theoretical model has been validated with measurements from experiments conducted in a 600 kWe pilot plant. This thesis presents the installation of a plate heat exchanger in the pilot plant. The experience from the pilot plant is used in a comparative study. This study evaluates the influence of the aftercooler on the performance of the evaporative gas turbine. A test facility for evaporation processes at elevated pressures and temperatures have been built. Evaporation of binary mixtures into a compressed air stream has been performed.<br/><br>
<br/><br>
Experimental studies with the pilot plant have revealed that it is possible to use a plate heat exchanger as aftercooler in the evaporative gas turbine. The pressure drop on the air side in the aftercooler has been experimentally determined to 1.6% and the pinch-point to 0.1°C. The reconstruction of the pilot plant from a simple cycle to an evaporative cycle has resulted in an increase in thermal efficiency from 21% to 35%. A theoretical model has been developed for the humidification process that predicts the height of the humidification column with an error of 10?15%. Thermodynamic analysis of the bio-EvGT has been performed which have showed that the bio-EvGT cycle has an optimum efficiency of 34%. Further thermodynamics analysis has indicated that the bio-EvGT is a viable alternative to the biomass fueled steam turbine cycle.},
  author       = {Thern, Marcus},
  isbn         = {91-628-6696-6},
  issn         = {0282-1990},
  keyword      = {applied thermodynamics,Thermal engineering,Energiforskning,Energy research,HAT,Biomass,Biofuel,Humidification,Evaporation,'Evaporative gas turbine','Humid air turbine',Termisk teknik,termodynamik},
  language     = {eng},
  pages        = {250},
  publisher    = {Division of Thermal Power Engineering Department of Energy Sciences Faculty of Engineering Lund University},
  school       = {Lund University},
  title        = {Humidification Processes in Gas Turbine Cycles},
  year         = {2005},
}