| 摘要 |
The present invention is provided with: a reference gas supply source (115) that adds a reference gas (4) that is a noble gas to a carbonization gas (3); a combustor (120) that combusts the mixed gas of the carbonization gas (3) and the reference gas (4) and sends out an inspection gas (9); a gas rheometer (132) that measures the flow rate (Fi) of the inspection gas (9); a gas concentration measurement device (131) that measures the concentration (Cr) of the reference gas (4) (noble gas) and the concentration (Cc) of carbon dioxide in the inspection gas (9); and a computation control device (130) that determines the flow rate (Fr) of the reference gas (4) (noble gas) in the mixed gas from the concentration (Cr), determines the amount (Wc) generated of the carbon component in the carbonization gas (3) from the concentration (Cc), flow rates (Fr, Fi), and flow rate (Fs) of the reference gas (4) (noble gas) supplied to the carbonization gas (3), determines the carbonization fraction (Dt) of carbonized charcoal (2) from the concentration (Cg) of the carbon component in low-grade charcoal (1), the amount (Wc) generated, and the weight (Wo) of supplied low-grade charcoal (1), and controls a valve (118a) in a manner so that a target carbonization fraction (Dr) results. |
