Synopsis At No. 2 blast furnace of Sakai Works, effort is being made to develop and practically apply new types of sensors (magnetometer, and gas flow meter) and probes (shaft diameter probe, shaft wall probe, etc.) for accurate measurement of gas flow distribution and burden behavior in the lumpy zone. Mathematical models for estimation of the state of lumpy zone and the outer profile of cohesive zone in the furnace have been developed. The cohesive zone model is composed of simultaneous

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... ry differential equations including heat transfer equations and material balance equations, and the Runge-Kutta-Gill method is employed to obtain numerical solution for this model. By using the information from these new probes and models several new findings have been obtained.