METHOD FOR DUST COLLECTION IN BUILDING OF CASTING HEARTH OF BLAST FURNACE

PURPOSE:To collect dust surely, to maintain the working environment in a building well and to save electric power by controlling the flow rate of dust collecting wind with dust measuring devices in the building, and controlling timers by the operation of a molten iron spout cover and the like at the peak of dust collection just prior to the end of tapping. CONSTITUTION:The dust produced in a casting hearth is captured in a dust collector 8 with a fan 7 through the hood on the roof of a building 4 which is partitioned in the upper part. The dust is sampled from measuring points A1, A2..., and the signals from dust measuring devices 31, 32... are put via processing parts 21, 22... into a storage part 24, by which the fan 7, dampers 11a-11c, a ventilation louver 9 are controlled to the optimum dust collection state. Next, a dust collection peak takes place in an extremely short time and therefore the control of the flow rate of suction wind from the devices 31, etc. cannot follow up the peak in time. Hence, a molten iron spout cover 15 is retreated or the operation signal of a mud gun 13 is inputted to the part 24, by which the fan 7 is rotated at the max. speed and the damper 11a, etc. are fully opened, thence the dust collector 8 is fully operated. Since the time up to the end of the tapping fluctuates hardly, this control timer is set with a timer.