Dan Daly - Combustion Performance of Biodiesel and Diesel-Vegetable Oil Blends in a Simulated Gas Turbine Burner

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  Publication Details (including relevant citation   information):

  Journal of   Engineering for Gas Turbines and Power

    MAY 2009,   Vol. 131 /   031503-1


  Recent increases in   fuel costs, concerns for global warming, and limited supplies of   fossil

  fuels have prompted   wide spread research on renewable liquid biofuels produced   domestically

  from   agricultural feedstock. In this study, two types of biodiesels   and vegetable oil

  (VO)   are investigated as potential fuels for gas turbines to generate   power. Biodiesels

  produced from VO and   animal fat were considered in this study. The problems of   high

  viscosity and poor   volatility of VO (soybean oil) were addressed by using   diesel-VO

  blends with up to   30% VO by volume. Gas chromatography/mass spectrometry,   thermogravimetric

  analysis, and   density, kinematic viscosity, surface tension, and water   content

  measurements were   used to characterize the fuel properties. The combustion   performance

  of   different fuels was compared experimentally in an atmospheric   pressure burner with

  an   air-assist injector and swirling primary air around it. For   different fuels, the effect of

  the   atomizing airflow rate on Sauter mean diameter was determined   from a correlation

  for   air-assist atomizers. Profiles of nitric oxides


  NOx  and carbon monoxide   (CO) emissions

  were   obtained for different atomizing airflow rates, while the total   airflow rate was

  kept   constant. The results show that despite the compositional   differences, the physical

  properties and   emissions of the two biodiesel fuels are similar. Diesel-VO fuel   blends

  resulted in slightly   higher CO emissions compared with diesel, while the   NO

  correlated well with   the flame temperature. The results show that the CO and   NO


  emissions are   determined mainly by fuel atomization and fuel/air mixing   processes, and

  that the   fuel composition effects are of secondary importance for fuels   and operating

  conditions of the   present study.

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