| 摘要 |
PURPOSE:To make it possible to properly increase or decrease the waste gas circulation quantity and maintain the quantity of fuel at the minimum by detecting the qunatity of waste gas circulated to the combustion zone or cooling zone of the titled incinerator which burns sewage sludges, and the quntity of fuel corresponding thereto. CONSTITUTION:A part of waste gas discharged through a waste gas port 3 of the furnace top passes through a waste gas circulator 26 by a waste gas circulation quantity controlling device 29, and is circulated to a combustion zone, a cooling zone within the furnace or a hot air furnace 11. There exists a relationship shown in Fig. 2 between the waste gas circulating quantity Am<3>/h and the fuel quantity Bl/h. For this reason, beginning from the fuel qunatity B1 with respect to the waste gas circulating quantity A1, the waste gas circulating quantity is increased by a predetermined quantity (a) every predetermined time, and is successively compared with the integrated value of the fuel quantity every predetermined time. When the integrated value of the fuel quantity reaches a value B4 increased from the integrated value at the previous time, the operation is repeated at a waste gas circulating quantity between A3 and A4. In this manner, the fuel can be burnt in a range close to the minimum fuel quantity BM. |
