| 摘要 |
A process for preparing an irreversibly dried coal. In the first step of this process, there is provided a fluidized bed reactor with a fluidized bed density of from about 20 to about 40 pounds cubic feet, which is at a temperature of from about 480 to about 600 degrees Fahrenheit. To this reactor is fed coal 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; also fed to this reactor is from about 0.5 to about 3.0 weight percent (by weight of dried coal) of mineral oil with an initial boiling point of at least about 900 degrees Fahrenheit. A coated coal is produced in the reactor, and it is subjected to a temperature of from about 480 to about 600 degrees Fahrenheit for from about 1 to about 5 minutes while simultaneously being comminuted and dewatered. The comminuted and dewatered coal is passed to an elutriator in which said comminuted and dehydrated coal is contacted with air and separated into a coarse fraction and a fine fraction. The coarse fraction from the elutriator is fed to the fluidized bed, while the fine fraction from the elutriator is quenched to reduce its temperature to ambient temperature within about 5 seconds.
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