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For the stability in operation and durability in blast furnace campaign life, the draining time optimization is a very important factor. For this purpose, the extent of liquid level in hearth representing the slag and hot metal occupancy should be estimated on continuous basis. The increased liquid levels in the hearth affect the smooth operations occurring in the blast furnace by exerting an upward force on the submerged coke deadman resulting in slow down of burden descent and disturbance in the blast pressure. To avoid any irregularity, the hearth liquid level should be kept under control and liquid iron and slag must be removed at a rate which does not allow any hazardous effect. This necessitates the precise and real time analysis of liquid products in hearth. But the direct measurement technique of this level in the hearth is unavailable due to high temperature and pressure inside the blast furnace. In order to analyse it, indirect approaches have been developed which determines the accumulation of molten metal and slag in the hearth on the basis of estimated hot metal and slag influx using chemical mass balance, draining rate of molten metal calculated by the filling level of torpedoes using radar sensors, outflow rate of slag through the slag granulation plant and geometry of hearth. The paper deals with the effects as well as dependency of liquid level on the blast furnace performance and the other process parameters and its measurement along with the action standards to control it.

“studies on influence of liquid level on blast furnace performance and monitoring of hearth drainage”