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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.142 SNIP: 0.16 CiteScore™: 0.29

ISSN Print: 2150-766X
ISSN Online: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v5.i1-6.100
pages 71-80

COMBUSTION PROPERTIES RELEVANT TO COFIRING OF SOLID ROCKET MOTOR WASHOUT MATERIAL

Steven G. Buckley
Center for Energy Environmental Engineering, Department of Mechanical Engineering, University of Maryland, College Park, Maryland 20742, USA
Rick Moehrle
Sandia National Laboratories, Livermore, CA 94551 USA
Joel Lipkin
Combustion Research Facility, Sandia National Laboratories Livermore, CA 94550
Glenn Mower
Thiokol Propulsion Division, Brigham City, UT 84302 USA
Larry L. Baxter
Brigham Young University, Department of Chemical Engineering, Provo, UT 84602 USA

ABSTRACT

High pressure water washout of large solid rocket motors yields a residue which is primarily comprised of aluminum flake, polybutadiene rubber, ammonium perchlorate, and asbestos entrained from the liner. Treatment following washout recovers most of the ammonium perchlorate from the residue for reuse, desensitizing the washout residue. Often this material is subsequently disposed of through open burning/open detonation (OB/OD) or in landfills.
This paper presents results from a small bed combustor designed to examine materials issues and ash chemistry in a configuration similar to a grate-fired industrial combustion system. Desensitized EM has been mixed with pine biomass fuels and burned in the bed combustor under a variety of combustion conditions. Temperature measurements in the bed and inspection following the combustion event were used to assess the potential for materials damage in a full-scale system. Residual ash samples were analyzed to determine the amount of chlorine retained in the ash. Thermochemical modeling designed to simulate combustion of EM in a waste incinerator was used to predict the major products of combustion. We discuss the significance of these results with respect to previous results and to the plans for a full-scale commercial cofiring test.


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