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Abstract

High gradient magnetic separation has been applied to the problem of removing suplhur and ash from pulverized coal prior to combustion at coal burning power stations.

These experimental tests have indicated that the dry magnetic desulphurization process is able to remove up to 72% of the pyritic sulphur and 44% of the ash content from a typical pulverized coal in a vertically upward airsteam rig and that the heating value recovery is 95%. Increasing magnetic field intensity increases the percentage of reductions of pyritic sulphur, total sulphur and ash content. The penalty for the improved sulphur reductions is the sulphur, total sulphur and ash content. The penalty for the improved sulphur reductions is the reduced heating value recoveries. Very high coal flow flux slightly depresses the magnetic cleaning efficiency, but this may be due to the limitations of the dry fluidized bed aerosol generator at such high flow rates. Of all the grades of the separator matrix, the matrix made of 0.360 circular AISI 430 stainless steel wires has the best removal performance under contrast experimental conditions.

Additional information

Authors: BOUCHER R, University of Sheffield, Department of Mechanical and Process Engineering, Sheffield (GB);ZHOU S, University of Sheffield, Department of Mechanical and Process Engineering, Sheffield (GB);GARBETT E, University of Sheffield, Department of Mechanical and Process Engineering, Sheffield (GB)
Bibliographic Reference: EUR 17492 EN, (1999) 86pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-5439-6
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