充填層内の通気性及び伝熱特性からみた新塊成鉱プロセスの評価
1989 年 75 巻 1 号 p. 50-57
詳細
1989 年 75 巻 1 号 p. 50-57
A new iron ore agglomeration process was experimentally evaluated in comparison with the sinter process on the basis of permeability and heat transfer characteristics in the bed. Desirable operating conditions for the new process were also investigated. The main results obtained are as follows :
(1) The productivity of the new process increased linearly in proportion to the gas volume passing through bed, while the maximum productivity of the sinter process was estimated at 1.6 t/m2 h due to the limit of the permeability in the bed by the capacity of the suction blower.
(2) According to the sintering test results for the two processes using a pot made of a transparent silica glass tube, the new process's melting zone temperature seemed to be higher than that of the sinter process, owing to be the efficient combustion of fine coke coated on the green ball.
(3) An evaluation of gas flow characteristics in the bed by a mathematical model, the productive yield for the new process seemed to be superior to that of the siner process, in that it controlled excessive gas flow near the side plate.
(4) It was proved by both mathematical and experimental evaluations that the size of the green balls should be mainly controlled between 5 and 10 mm in order to achieve sufficient heat conduction within the pellet.
