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Thermal analysis of a heat recovery system for externally fired micro gas turbines

Bahador, Mehdi LU ; Ito, Takamasa LU and Sundén, Bengt LU (2007) 2007 ASME Turbo Expo In Proceedings of the ASME Turbo Expo 3. p.1023-1030
Abstract
Several serious problems such as material durability and fouling in the High Temperature Heat Exchanger (HTEH) for Externally Fired Micro Gas Turbines (EFMGT) cause the low thermal efficiency. In this study for increasing the thermal efficiency, a duct around a cylindrical fixed bed combustor which burns wood pellets is proposed and two different designs, empty and porous material filled, are investigated. A heat transfer model, based on coupling between radiative and convective modes at the combustor and duct sides is developed to evaluate the important geometrical parameters in the different designs. The predicted results for the empty duct show that although an increase of the combustion length increases the temperature of air at the... (More)
Several serious problems such as material durability and fouling in the High Temperature Heat Exchanger (HTEH) for Externally Fired Micro Gas Turbines (EFMGT) cause the low thermal efficiency. In this study for increasing the thermal efficiency, a duct around a cylindrical fixed bed combustor which burns wood pellets is proposed and two different designs, empty and porous material filled, are investigated. A heat transfer model, based on coupling between radiative and convective modes at the combustor and duct sides is developed to evaluate the important geometrical parameters in the different designs. The predicted results for the empty duct show that although an increase of the combustion length increases the temperature of air at the duct outlet, an increase of the combustor diameter is more effective. In addition, an increase of the duct cross section is the most effective way and according to the predictions, the pressure drop in this case is still acceptable. The porous duct design shows a significant increase in the air temperature at the duct outlet. However, the pressure drop is high. The investigation shows the possibility of reduction of the pressure drop with the same amount of heat transfer by selecting suitable particle size and porosity. Copyright © 2007 by ASME. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Thermal efficiency, Fixed bed combustors, Heat recovery systems
in
Proceedings of the ASME Turbo Expo
volume
3
pages
1023 - 1030
publisher
American Society Of Mechanical Engineers (ASME)
conference name
2007 ASME Turbo Expo
external identifiers
  • WOS:000252771900105
  • Scopus:34548748129
language
English
LU publication?
yes
id
38aa71fd-5c6c-47ac-beb9-9edc0a7d5ae9 (old id 643284)
date added to LUP
2007-12-04 14:15:38
date last changed
2016-10-13 04:51:07
@misc{38aa71fd-5c6c-47ac-beb9-9edc0a7d5ae9,
  abstract     = {Several serious problems such as material durability and fouling in the High Temperature Heat Exchanger (HTEH) for Externally Fired Micro Gas Turbines (EFMGT) cause the low thermal efficiency. In this study for increasing the thermal efficiency, a duct around a cylindrical fixed bed combustor which burns wood pellets is proposed and two different designs, empty and porous material filled, are investigated. A heat transfer model, based on coupling between radiative and convective modes at the combustor and duct sides is developed to evaluate the important geometrical parameters in the different designs. The predicted results for the empty duct show that although an increase of the combustion length increases the temperature of air at the duct outlet, an increase of the combustor diameter is more effective. In addition, an increase of the duct cross section is the most effective way and according to the predictions, the pressure drop in this case is still acceptable. The porous duct design shows a significant increase in the air temperature at the duct outlet. However, the pressure drop is high. The investigation shows the possibility of reduction of the pressure drop with the same amount of heat transfer by selecting suitable particle size and porosity. Copyright © 2007 by ASME.},
  author       = {Bahador, Mehdi and Ito, Takamasa and Sundén, Bengt},
  keyword      = {Thermal efficiency,Fixed bed combustors,Heat recovery systems},
  language     = {eng},
  pages        = {1023--1030},
  publisher    = {ARRAY(0xa1583b0)},
  series       = {Proceedings of the ASME Turbo Expo},
  title        = {Thermal analysis of a heat recovery system for externally fired micro gas turbines},
  volume       = {3},
  year         = {2007},
}