NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Continuous extrusion of coalA feeding method for use with bituminous coals that exhibit plasticity at elevated temperatures is described and demonstrated on a small screw extruder previously used to extrude polyethylene. A metered feed of coal heated to a temperature just below that of incipient caking (approximately 450 C) is used. Modifications to the extruder consisting of ceramic band heaters, auxiliary cooling coils on the thrust bearing and special quick opening dies are detailed. Coals successfully extruded include high volatile A bituminous coals, high volatile B bituminous coals, a high volatile C bituminous coal and a coal with high ash content. The computer program, EXTRUD, used to simulate the extruder is described. Predicted power consumption exhibits 30% scatter, which is explained by the sensitivity of the coal friction coefficient to temperature profiles. Detailed analysis reveals some discrepancies in the program that need to be resolved.
Document ID
19790042359
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
England, C.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Kushida, R.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Daksla, C.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena Calif., United States)
Date Acquired
August 9, 2013
Publication Date
August 1, 1978
Publication Information
Publication: Chemical Engineering Progress
Subject Category
Energy Production And Conversion
Accession Number
79A26372
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available