| 摘要 |
A primary air flow amount becomes a minimum primary air flow amount when an incineration amount Br is equal to or lower than 75%. In a case of exceeding the minimum primary air flow amount, a circulation unit conducts a restrained combustion in which a fuel consumption amount Fr of a sludge per unit incineration amount is maintained at a constant value and a primary air ratio m1 is lower than one, a post-combustion unit conducts a first multi-layer incineration process B1 of feeding a secondary air and a tertiary air to conduct a perfect combustion, in a case of the minimum primary air flow amount, a second multi-layer incineration process B2 is configured to be conducted in which a fuel consumption amount Fr is of a value that is identical to that of the first multi-layer incineration process B1, the primary air ratio m1 is increased gradually to a value of a total air ratio m for the entire circulating-type multi-layer furnace along with a decrease in the incineration amount Br of the sludge per unit time, and a secondary air ratio m2 and a tertiary air ratio m3 are decreased gradually to a value of zero. |
