Upgrading solid fuels

Fuel and related compositions – Liquid fuels – Aluminum or heavy metal – other than lead – containing

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44 1G, 44 10F, 241 15, C10L 506, B02C 2318

Patent

active

047011840

ABSTRACT:
Process for treatment of brown coal which comprises subjecting the said coal to shearing forces to produce a plastic mass which is capable of conversion by subsequent compaction and drying into a fuel of increased density and enhanced calorific value, is characterized in that the water content of the coal is more than 54% and the shearing forces are applied for less than one hour, shorter times being preferred, for example less than 30 seconds. A preferred embodiment provides a continuous process in which the coal is treated in a machine that subjects it to sequential steps of shearing and extrusion in a continuous manner. The extruded product after drying provides the fuel of increased density and enhanced calorific value. The desired effect may also be obtained by treating part of a quantity of brown coal and blending the treated portion with the untreated remainder of the said quantity.

REFERENCES:
patent: 3758385 (1973-09-01), Fischer
patent: 4627575 (1986-12-01), Johns et al.

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