Effect of inlet air cooling by absorption chiller on gas turbine and combined cycle performance

Khaledi, H ; Sharif University of Technology | 2005

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  1. Type of Document: Article
  2. DOI: 10.1115/IMECE2005-82231
  3. Publisher: 2005
  4. Abstract:
  5. Gas turbine performances are directly related to site conditions. The use of gas turbines in combined gas-steam power plants, also applied to cogeneration, increases such dependence. In recent years, inlet air cooling systems have been introduced to control air temperature at compressor inlet, resulting in an increase in plant power and efficiency. In this paper, the dependence of outside conditions for a simple gas turbine and a combined cycle plant is studied, using absorption chiller as inlet air cooling system. We used, as case study, a simple plant equipped with one frame E gas turbine and a combined cycle with a two pressure level heat recovery steam generator (HRSG). It was found that inlet air cooling with absorption chiller has great positive influence on power and less on efficiency of the gas turbine plant. Two steam sources (External and Internal) have been considered for chiller. External source has large positive influence on power but keep the efficiency of the combined cycle unchanged, while internal source causes a reduction in steam turbine mass flow. Consequently power production and efficiency of the combined cycle decrease. This reduction is lower in mid temperature (25 to 35°C) but higher in high temperature (35 to 45°C). Inlet cooling would result in lowering turbine exhaust temperature, thus decreasing the efficiency of HRSG. Copyright © 2005 by ASME
  6. Keywords:
  7. Cycle decrease ; Exhaust temperature ; Mass flow ; Adsorption ; Air ; Cooling systems ; Flow of fluids ; Gas turbines
  8. Source: 2005 ASME International Mechanical Engineering Congress and Exposition, IMECE, Orlando, FL, 5 November 2005 through 11 November 2005 ; Volume 45 , 2005 , Pages 507-515 ; 10716947 (ISSN)
  9. URL: https://asmedigitalcollection.asme.org/IMECE/proceedings/IMECE2005/42118/507/309745