| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and a device for efficiently manufacturing activated charcoal, which is an inexpensive charcoal having high surface activity suitable for environmental clean-up or the like. SOLUTION: This method comprises detecting by a thermocouple a centrosphere temperature of a treated material 21 which is a raw material for charcoal and changing or controlling the volume of combustion emission gas supplied to a carbonizing furnace 2 as heat source so that the detected centrosphere temperature meets the programmed characteristics of temperature change set separately in respective processes for drying, thermal decomposition, charring, carbonization/activation and forcibly cooling. In the carbonization/activation process, combustion emission gas is supplied together with activation gas such as air and steam to simultaneously carry out carbonization and activation treatments. In the forcibly cooling process, cooling gas is repeatedly supplied into the carbonizing furnace to forcefully lower the treated material's temperature. When the treated material's temperature is lowered to about 150 deg.C, cooling water is sprayed in the carbonizing furnace while supplying cooling gas to accelerate cooling speed and shorten the time required for cooling. |
