Process for processing coal

C - Chemistry – Metallurgy – 10 – L

Patent

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Details

C10L 9/08 (2006.01) C10B 57/10 (2006.01) F26B 3/08 (2006.01) F26B 21/14 (2006.01)

Patent

CA 2251896

A process for preparing an irreversibly dried coal which utilizes a fluidized bed reactor (10) with a fluidized bed (14) density of from about 20 to about 40 pounds cubic feet which is at a temperature of from about 150 to about 200 ~F. To this reactor is fed coal (12) with a moisture content of from about 25 to about 30 percent, an oxygen content of from about 10 to about 20 percent, and a volatile matter content of from about 35 to about 45 percent; and it is subjected to a temperature of from about 150 to about 200 ~F for from about 1 to about 5 minutes while simultaneously being comminuted and dewatered. The comminuted and dewatered coal is passed (22) to a second fluidized bed reactor (18) with a fluidized bed (24) density of from about 20 to about 40 pounds per cubic foot and a reactor temperature of from about 480 to about 600 ~F. Also fed to this second fluidized bed reactor is from about 0.5 to about 3.0 wt.% of mineral oil (32).

L'invention porte sur un procédé de préparation de charbon irréversiblement déshydraté utilisant un réacteur à lit fluidisé (10) dont le lit fluidisé (14) présente une densité d'environ 20 à environ 40 livres par pied cubique et dont la température est comprise entre environ 150 et environ 200 ·F. Ledit réacteur est alimenté en charbon (12) dont la teneur en humidité est comprise entre environ 25 et environ 30 %, la teneur en O, entre environ 10 et environ 20 %, et la teneur en matières volatiles, entre environ 35 et environ 45 %, maintenu entre environ 150 et environ 200 ·F pendant environ 1 à environ 5 minutes tout en étant simultanément fragmenté et déshydraté. Le charbon fragmenté et déshydraté passe (22) ensuite dans un deuxième réacteur à lit fluidisé (18) dont le lit fluidisé (24) présente une densité d'environ 20 à environ 40 livres par pied cubique et dont la température est comprise entre environ 480 et environ 600 ·F, et en outre alimenté en huile minérale (32) représentant entre environ 0,5 et environ 3,0 % en poids.

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