Fuel mixt. useful as coal substitute - comprising coal dust, paper pulp, filler and coating of tar, etc., has calorie cost lower than coal

摘要

Fuel comprises: (i) 30-60% coal dust; (ii) 5-20% paper pulp; (iii) one or more of the fillers (iiia) 20-60% (relative to dry fuel) of clay, sand or earth, (iiib) 0-15 wt.% sawdust, (iiic) 5-20 wt.% water, and (iiid) 0-60% further organic materials and combustible materials from industrial and domestic refuse; and (iv) tar, pitch or asphalt, which protects the prod. facilitates its handling and gives it a pleasing appearance. The coal dust may be a byprod. of coal mining, or may be obtd. by grinding. The paper pulp may be replaced by similar pulp from e.g. straw or wood: this component acts as binder and provides some calories on combustion. Component (iv) may be applied as emulsion, soln. or melt. USE/ADVANTAGE - Useful as a coal substitute. The properties are similar to those of coal, but the cost per calorie is 25-35% less, and heat liberation lasts longer. Under-utilised and waste materials are used.