Coal and its Suitability for Glass Furnace Heating

JSGT 1937 V21 T215-T234

An account is given of the most desirable properties of coals for use in gas producers, illustrated by nineteen coals from seven different localities. Dull, hard, non-caking coals are preferred, of low moisture, ash, and volatile matter contents, the fusion point of the ash in a reducing atmosphere being about 1300°. It is recommended that the properties of different coals should always be compared by the same coal sizes, and that the selection of a coal should finally depend on the calorific value of the coal as received, Some sacrifice may be made with regard to the bulk density of the ash, provided attention be paid to those parts of the producer and furnace structure likely to be affected by ash deposition. High chloride contents should not be tolerated because of their deleterious effect on the furnace refractories. The permissible sulphur content depends on the type of glass melting operations involved.

D. Sismey