C - Chemistry – Metallurgy – 10 – L
Patent
C - Chemistry, Metallurgy
10
L
C10L 9/08 (2006.01) C10B 49/04 (2006.01)
Patent
CA 2075139
ABSTRACT OF THE DISCLOSURE A method of treating coal. The method comprises passing the coal through a retort having a shell temperature of about 500-1000°F and shock heating the coal to a maximum surface temperature of about 500-1000°F without allowing the coal to become exothermic. The coal is prevented from going exothermic by a combination of factors, including the evaporation of moisture from the shock heated coal, the tendency of coal to absorb heat and maintain a temperature of about 390-570°F until the coal undergoes molecular transformation of comp lex hydrocarbons contained in the coal to simpler forms, and the effects of a cooling blanket gas passed through the shock heated coal. The blanket gas preferably comprises an oxygen lean blanket gas stream containing about 2-8% oxygen by volume. The treated coal exhibits extremely low moisture content and increased BTU value and other improved combustion characteristics.
Adams Robert J.
Smart & Biggar
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