Sintering condition fluctuates considerably in sintering bed, particularly at large scale sintering machines. The fluctuation deteriorates the quality, yield and productivity of sinter. The fluctuation, therefore, must be controlled to improve both the quality and the sinter operation.
The heat-pattern control system along the width direction of sintering bed has been developed and applied to Ohgishima Sintering Plant at Keihin Works. This system unifies automatically the sintering speed along the width direction by measuring waste gas temperature under pallets at No. 18, 20 and 22 wind box to evaluate the fluctuation and by controlling the five charging gates divided along the width direction of sintering machine.
The coefficient of variation of the waste gas temperature at No. 20 wind box decreased to 0.06 from 0.19 by applying the control system. The sinter quality, the return fine amounts and the productivity of sinter were also improved by decreasing the fluctuation.
