Abstract
The development of schemes of heat exchange in a blast furnace was considered with the improvement of the blast furnace smelting technology. It was noted that for the estimation of the thermal state of blast furnace as a control object it is expedient to divide it into two thermal zones, upper and bottom. The interface between them is in the top of the mixed recovery between the level of the beginning of the carbon gasifi cation of coke and the horizon, below which iron oxides are directly reduced. Upper slow heat exchange section in terms of heat exchange is reserve height providing better thermal and regenerative operation of the furnace. The bottom section of slow heat exchange should not be used as a reserve for improvement of thermal and reduction work of the blast furnace. It is shown that the presence of two zones of intense heat exchange in the present conditions of smelting of various types of iron ore using the combined blowing of high parameters is a prerequisite for the stability of the course of the blast furnace process and effi ciency of smelting.
Highlights
The development of schemes of heat exchange in a blast furnace was considered with the improvement of the blast furnace smelting technology
It was noted that for the estimation of the thermal state of blast furnace as a control object it is expedient to divide it into two thermal zones, upper and bottom
The bottom section of slow heat exchange should not be used as a reserve for improvement of thermal and reduction work of the blast furnace
Summary
Используя результаты анализа изменения теплоемкостей потоков шихты и газа по высоте печи, Б.И. На верхней ступени теплообмена Wш < Wг (то есть m < 1,0), на нижней Wш > Wг (то есть m > 1,0); – теплообмен в доменной печи завершен, что подтверждается существованием зоны замедленного теплообмена. Характер изменения температур газа (tг ) и шихты (tш), отношения теплоемкостей потоков по высоте печи показаны на рис. При этом у температурных кривых шихты и газа в нижней ступени теплообмена появился характерный изгиб в сторону снижения градиента температур. Общий вид уточненной схемы теплообмена по высоте доменной печи приведен на рис. Серия измерений при плавке различного железорудного сырья показала наличие по высоте шахты доменной печи в некоторых случаях двух участков с малоизменяющейся температурой Change of the gas temperature at the height of the blast furnace when melting pellets, fluxed by limestone (1), dolomite (2) non-fluxed pellets (3) and sinter (4)
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