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Thermo-economic evaluation of bio-ethanol humidification EvGT cycle

In English

Författare

Summary, in English

The evaporative gas turbine pilot plant (EvGT) has been in operation at Lund Institute of Technology in Sweden since 1997. This article presents the latest development in the evaporative technology, the evaporation of bio-ethanol in a gas turbine power plant as a means to reduce the emission of greenhouse gases. Bio-ethanol is produced from a feedstock consisting of corn-stover, and the bio-ethanol is here considered to be a renewable fuel with zero impact regarding CO<sub>2</sub> in the exhaust gases. This concept is evaluated and compared to a direct-fired Rankine cycle in the size range of 3-5 MW <sub>el</sub> and 15-30 MW<sub>el</sub> concerning plant efficiency and investment cost. The proposed bio-ethanol evaporation technology provides fuel for a Humid Air Turbine by evaporating bio-ethanol into the compressor discharge air. This evaporation process creates a combustible gas that is led to the combustor as the primary fuel. The bio-ethanol used in the process has not been distilled. The bio-ethanol is supplied to the process as a mash, i.e. a mix of water and ethanol with low concentration of ethanol. To extract the ethanol from the mash, energy is required. In this process, low-level heat from the gas turbine cycle is used for the separation process. All power cycles studied have been modeled in IPSEpro [trademark] , a heat and mass balance software, using advanced component models developed by the authors. An equilibrium model is used to model the behavior of the evaporation of ethanol and water into an air stream. A correction parameter has been introduced into the equilibrium model to account for the deviation from equilibrium. This parameter has been validated through experimental work on the Evaporative Gas Turbine pilot plant. The evaporation technology can be used with different types of cycle configurations attaining electrical efficiencies of 29% for a simple version of a Humid Air Turbine. The Humid Air Turbine can sustain a combustor outlet temperature of 1100

Avdelning/ar

Publiceringsår

2005

Språk

Engelska

Sidor

153-161

Publikation/Tidskrift/Serie

Proceedings of the ASME Turbo Expo

Volym

5

Dokumenttyp

Konferensbidrag

Förlag

American Society Of Mechanical Engineers (ASME)

Ämne

  • Energy Engineering

Nyckelord

  • Separation process
  • Evaporative technology
  • Humidification
  • Bio-ethanol

Conference name

ASME Turbo Expo 2005 - Gas Turbie Technology: Focus for the Future

Conference date

2005-06-06 - 2005-06-09

Conference place

Reno-Tahoe, NV, United States

Status

Published