Process for modification of coal
AssigneeIdemitsu Kosan Co., Ltd.
InventorsKatsuzo Kubota, Masayuki Nakai, Shigeyoshi Ono
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Abstract
A process for upgrading the characteristics of moisture containing coal which comprises drying coal until the water content reaches substantially zero, rapidly heating the dried coal to a molding temperature of from 200.degree. to 400.degree. C. within a time of from 1 to 10 minutes, compression molding the dried coal under elevated pressure, oxidizing the molded coal and then steaming said oxidized molded coal in saturated moisture at from 80.degree. C. to 150.degree. C. from 2 to 8 hours to provide a dry upgraded coal having a decreased tendency to self-ignite.
Claims13
A process for upgrading the characteristics of moisture containing coal which comprises drying coal until the water content reaches substantially zero, rapidly heating the dried coal to a molding temperature of from 200.degree. to 400.degree. C. within a time of from 1 to 10 minutes, compression molding the dried coal under elevated pressure, oxidizing the molded coal and then steaming said oxidized molded coal in saturated moisture at from 80.degree. C. to 150.degree. C. from 2 to 8 hours to provide a dry upgraded coal having a decreased tendency to self-ignite and having a temperature for generation of 1% carbon dioxide of 115.degree. C. or more, a compressive strength of at least 80 kilogram forth per centimeter (kgf/cm), and a bulk density of 1.1 grams per cubic centimeter (g/cm.sup.3).
Dependencies are inferred from the claim text.