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Coal desulfurization in a fluidized bed reactor

Authors

  • M. Ravindram,

    1. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109
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    • M. Ravindram NRC-NASA Senior Resident Research Associate at JPL, on leave from the Indian Institute of Science, Bangalore, 560012, India. Maddury Ravindram is a professor in the Deparment of Chemical Engineering, Indian Institute of Science, Bangalore. He was a Senior Resident Research Associate under National Research Council (NRC) and National Aeronautics and Space Administration (NASA) sponsorship at the Jet propulsion Laboratory, California, Institute of Technology form December 1981 through January 1984. During this period he carried out experimental studies on the application of a fluidized bed to coal desulfurization. He obtained a B.S. in Chemical Technology from Bombay University and a M.S. and PhD. in Chemical Engineering from the Indian Institute of Science.

  • John J. Kalvinskas

    1. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109
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    • John J. Kalvinskas has been at the Jet Propulsion Laboratory, California Instiute Technology, for the past eleven years where he has carried out assignments in a varielty of fields including Project Management and Engineering of JPL coal desulfurization by chlorinolysis process under DOE sponsorship. He graduated from M.I.T. with B.S. and M.S. degrees in Chemical Engineering and obtained his Ph.D in Chemical Engineering from the California Institue of Technololgy. He holds the eight U.S. patents and has a number of publications in a variety of fields including propulsion, heat transfer, environmental engineering, coal and bioenergy fields, toxic and hazardous waster disposal and space applications.


Abstract

Fluidized bed reactor technology was investigated as a means of developing a new simple and low cost process for coal desulfurization. Preliminary experimental results obtained in a 2.54 cm batch fluidized bed reactor have shown that over 80% total sulfur reductions can be achieved by sequential chlorination and dechlorination/hydrodesulfurization of high sulfur pulverized coals. Proximate and ultimate analyses of desulfurized coals have revealed enhanced carbon and fixed carbon levels and substantially reduced volatile, oxygen and hydrogen contents. While there was a minor increase in the ash content and heating value, nitrogen and chlorine contents were essentially unchanged.

Compared to an earlier slurry phase process, the fluidized bed reactors process has specific advantages such as shorter reaction times, fewer processing steps and reduced reactant requirements. A fluidized bed reactor process may thus have a potential of being developed into a simple and economic means of converting high sulfur coals to environmentally acceptable fuels.

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