Chair of Iron and Steel Metallurgy, Nosov Magnitogorsk State Technical University (Magnitogorsk, Russia):

Druzhkov V. G., Cand. Eng., Assist. Prof.
Ivanov A. V., Cand. Eng., Assist. Prof.
Prokhorov I. E., Cand. Eng., Assist. Prof.
Maistrenko N. A., Post-Graduate
Kharchenko A. S., Post-Graduate

E-mail (common): as.mgtu@mail.ru

The paper presents generalized information about advantages and disadvantages of bell-less tops of trough and rotary types, based on publications and experimental data. It was established that maximal separating eff ect of gas fl ow on charging materials has been noted for the bell top, then bell-less top of rotary type and bell-less tops of trough type occupy second and third places meaning the value of separating eff ect. Maximal size of emitted particles is calculated for the cases of using diff erent types of bell-less tops. If the blast furnaces are provided with iron ore raw materials stabilized in size of particles (dust emission more than 10–15 kg/t of iron), mounting of the bell-less top of rotary type is expedient. If the blast furnaces are equipped with large dual-passage bell-less top of trough type, when charging amount of iron ore raw materials and coke reach 100–120 t and 25–30 t respectively, gas pressure gradients (ΔP/m) signifi cantly increase in the area of softening and melting of materials. Therefore, instead of two limiting areas (upper and lower, according to M. A. Stefanovich) the third one appears in the area of softening and melting. If the blast furnaces with volume 1370–2000 m³ are equipped with single-passage bell-less top of trough type, it’s not possible to provide always homogeneous circular distribution of materials. Situation can be improved if we shall decrease the upper limit of sinter size from 80 to 60 mm (and even to 40 mm) and of coke from 80 to 60 mm. It will allow to lower opening degree of charging gate avoiding the danger of material fi ring.

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