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  • Other Sources  (3)
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  • 1
    facet.materialart.
    Unknown
    The deformation process and structure of crystalline polymers (1965)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Deformation process and structure of crystalline polymers
    Keywords: MATERIALS, NONMETALLIC
    Type: Proceedings of the Fourth International Congress on Rheology, Part 1; NASA-CR-80885
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Fluidized bed combustor modeling (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A general mathematical model for the prediction of performance of a fluidized bed coal combustor (FBC) is developed. The basic elements of the model consist of: (1) hydrodynamics of gas and solids in the combustor; (2) description of gas and solids contacting pattern; (3) kinetics of combustion; and (4) absorption of SO2 by limestone in the bed. The model is capable of calculating the combustion efficiency, axial bed temperature profile, carbon hold-up in the bed, oxygen and SO2 concentrations in the bubble and emulsion phases, sulfur retention efficiency and particulate carry over by elutriation. The effects of bed geometry, excess air, location of heat transfer coils in the bed, calcium to sulfur ratio in the feeds, etc. are examined. The calculated results are compared with experimental data. Agreement between the calculated results and the observed data are satisfactory in most cases. Recommendations to enhance the accuracy of prediction of the model are suggested.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-CR-135164
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Simulation of fluidized bed combustors. I - Combustion efficiency and temperature profile (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A chemical engineering analysis is made of fluidized-bed combustor (FBC) performance, with FBC models developed to aid estimation of combustion efficiency and axial temperature profiles. The FBC is intended for combustion of pulverized coal and a pressurized FBC version is intended for firing gas turbines by burning coal. Transport phenomena are analyzed at length: circulation, mixing models, drifting, bubble wake lift, heat transfer, division of the FB reactor into idealized mixing cells. Some disadvantages of a coal FBC are pointed out: erosion of immersed heat-transfer tubing, complex feed systems, carryover of unburned coal particles, high particulate emission in off-streams. The low-temperature bed (800-950 C) contains limestone, and flue-gas-entrained SO2 and NOx can be kept within acceptable limits.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Annual Meeting of the American Institute of Chemical Engineers; Nov 28, 1976 - Dec 02, 1976; Chicago, IL
    Format: text
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    NASA TECHNICAL REPORTS
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