Development of new charging system at Fukuyama sintering plant

In the sintering process, the productive yield of the upper layer in the sintering bed is lower than the middle and bottom layers, due to low density and insufficient heat supply. Therefore, this results in a deterioration of Tumbler Strength (TI) and return fine consumption. To improve productive yield, a new charging system was developed by NKK and installed at the No. 4 sintering plant. The main features of this system are: introduction of Segregating Slit Wires (SSW) and drum chute as substitute equipment for conventional sloping chute-type charging system. This new system enhances particle size segregation in the bed. A roller has been installed to increase the density of the upper part of the layer. Permeability in the sintering bed improved, and electrical power consumption at blowers in sintering plant decreased. Improved productive yield and return fine consumption, a decrease in burnt lime addition and coke consumption were confirmed. These improvements greatly contributed to the cost reduction of sinter.