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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