Experiments to examine the effects of biomass/coal cofiring on fine particle formation were performed in the Sandia Multi-Fuel Combustor using fuels of pure coal, three combinations of switchgrass and coal, and pure switchgrass. For this work, fine particles with aerodynamic diameter between 10 nm and 1 μm were examined. A constant solid-fuel thermal input of 8 kW was maintained. The combustion products were cooled from 1200 to 420°C during passage through the 4.2 m long reactor to simulate the temperatures experienced in the convection pass of a boiler. Fine particle number densities, mass concentrations, and total integrated number and mass concentrations at the reactor exit were determined using a scanning mobility particle sizer. The fine particle number concentrations for cofiring were much higher than those achieved with dedicated coal combustion. However, the total integrated mass concentration of particles remained essentially constant for all levels of cofiring from 0% coal to 100% coal. The constant mass concentration is significant because pending environmental regulations are likely to be based on particle mass rather than particle size.
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e-mail: lgblevi@sandia.gov
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July 2005
Technical Papers
Fine Particulate Formation During Switchgrass/Coal Cofiring
Linda G. Blevins,
e-mail: lgblevi@sandia.gov
Linda G. Blevins
Combustion Research Facility, P.O. Box 969, MS 9052, Sandia National Laboratories, Livermore, CA 94551-0969
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Thomas H. Cauley, III
Thomas H. Cauley, III
Combustion Research Facility, P.O. Box 969, MS 9052, Sandia National Laboratories, Livermore, CA 94551-0969
Search for other works by this author on:
Linda G. Blevins
Combustion Research Facility, P.O. Box 969, MS 9052, Sandia National Laboratories, Livermore, CA 94551-0969
e-mail: lgblevi@sandia.gov
Thomas H. Cauley, III
Combustion Research Facility, P.O. Box 969, MS 9052, Sandia National Laboratories, Livermore, CA 94551-0969
Contributed by the Fuels and Combustion Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received by the ICE Division, April 3, 2003; final revision received October 1, 2003. Associate Editor: S. Gollahalli.
J. Eng. Gas Turbines Power. Jul 2005, 127(3): 457-463 (7 pages)
Published Online: June 24, 2005
Article history
Received:
April 3, 2003
Revised:
October 1, 2003
Online:
June 24, 2005
Citation
Blevins, L. G., and Cauley, T. H., III (June 24, 2005). "Fine Particulate Formation During Switchgrass/Coal Cofiring ." ASME. J. Eng. Gas Turbines Power. July 2005; 127(3): 457–463. https://doi.org/10.1115/1.1804540
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