Novel high-gradient magnetic separation processes for desulfurization of dry pulverized coal for utility applications. Final technical report, January 1, 1982

Technical Report · Tue Jun 01 00:00:00 EDT 1982

OSTI ID:7022564

Liu, Y A

The project was concerned with the experimental development and demonstration of novel fluidized-bed, high-gradient magnetic separation (HGMS) processes for the removal of inorganic sulfur and ash from dry pulverized coal. By incorporating a number of improved processing methods and auxiliary equipment innovations into the fluidized-bed approach developed at Auburn University and patented by the US Department of Energy, pilot-scale HGMS process development units of both cyclic electromagnetic and superconducting types were successfully designed and constructed. Test results have demonstrated the significance of using higher field intensities provided by the new superconducting PDU for desulfurization of utility boiler feed coals (70 to 80% minus 200-mesh) without any external size classifications and ultrafines removal prior to magnetic separation. The results have shown the advantages of certain auxiliary process components, such as the automatic internal vibration/washing system, in maximizing the sulfur reduction, Btu recovery, and processing throughput. Quantitative effects of major operating variables and conditions on the grade and recovery of the magnetically cleaned coal and on the capacity of process operation were systematically investigated through factorial designs of experiments. The results showed that the new fluidized-bed HGMS processes could reduce the sulfur-Btu ratios of both Pennsylvania Upper Kittanning and Upper Freeport coals by 55 to 70% and achieve average Btu recoveries of 85 to 95%. Test results obtained with an Ohio Pittsburgh No. 8 coal of a high organic sulfur content indicated that it could not be effectively cleaned by the magnetic approach. Ranges of major operating variables and conditions for optimizing the performance of the new processes for desulfurization of dry pulverized coal were identified.

• Research Organization: Auburn Univ., AL (USA)
• DOE Contract Number: AC01-79ET14287
• OSTI ID: 7022564
• Report Number(s): DOE/ET/14287-T1; ON: DE82021888
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL PREPARATION
FEASIBILITY STUDIES
MAGNETIC SEPARATORS
BOILER FUELS
CALORIFIC VALUE
DEASHING
DESULFURIZATION
EXPERIMENTAL DATA
FLUIDIZED BED
PROCESS DEVELOPMENT UNITS
SUPERCONDUCTING MAGNETS
CHEMICAL REACTIONS
COMBUSTION PROPERTIES
COMMINUTION
CONCENTRATORS
DATA
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
FUELS
FUNCTIONAL MODELS
INFORMATION
MAGNETS
NUMERICAL DATA
SUPERCONDUCTING DEVICES
013000* - Coal
Lignite
& Peat- Transport
Handling
& Storage