| 摘要 |
PURPOSE:To dry the titled coking coal without the problems of flue corrosion and dangerous dust explosion, by using high-temp. steam drain discharged from a rotary dryer fitted with a steam pipe to heat a carrier gas and keep it warm. CONSTITUTION:Wet coal 2 as a starting material is continuously fed into a rotary dryer 1 fitted with a steam pipe, dried by passing steam through heat transfer pipes within the dryer 1 while raking and agitating, and discharged as moisture-regulated coal 3. On the other hand, a carrier gas 4 is fed from a supply port for wet coal 2, thereby exhausting the steam moisture produced by drying the wet coal 2. Then, heat exchange is conducted in a heat exchanger 10 between the gas 4 and the drain 9 discharged from the low-pressure steam 8 used in the dryer 1, so that the temp. of the gas 4 is maintained at a constant value so as to cause the gas 4 not to undergo dew condensation in an exhaust duct 11 and a dry dust collector 5. The gas 4 is fed through the duct 11 into the dust collector 5. Here the dust to be recovered as a product is collected, and the gas thus formed is sucked by means of an exhaust fan 6 and released into the atmosphere from a stack 7.
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