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Synopsis : When the productivity of No. 2 blast furnace at Sakai Works, Nippon Steel Corporation, was cut down from 2.08 t/d.m3 to 1.34 t/d.m3 because of the economic deterioration in Japan in the latter half of 1970's, coke was sampled at tuyere level seven times in the course of the cutdown. On the basis of the test result of the properties of the sampled coke, the followings were concluded : (1) As the production rate decreases, the point of the maximum temperature in the race-way moves toward the tuyere and the temperature of the dead-man decreases. (2) Coke becomes fragile because of the long time exposure to high temperatures at the lower part of the furnace. Therfore, the amount of coke fines in the race-way increases with increasing the kinetic energy of blast, and in consequence, gas flows upward rather along the wall side than in the center. On the other hand, the decrease of the amount of coke fine, which is brought about by the decrease of the kinetic energy of blast, results in a smooth operation which is attributed to the uniform gas distribution. However, in the case of the lower kinetic energy of blast, the temperature of the dead-man decreases and, consequently, softened and half—melted materials form in the region.

Relation between Shape of Race-way and Production Rate of Blast Furnace Taking Account of Properties of Coke Sampled at Tuyere Level