SU372846A1 - STEEL MELTING UNIT - Google Patents

Description

The invention relates to ferrous metallurgy, in particular to an aggregate for steel production by direct reduction of iron in electric furnaces.

A similar unit is known, containing two electric arc furnaces, the working spaces of which are interconnected by a gas duct and with an exhaust system.

The disadvantage of this unit is that the reducing gas entering the electric furnace from the adjacent furnace through the gas duct has insufficient contact with the charge.

The purpose of the invention is to increase the flue gas contacts with the charge.

This is achieved by the fact that the mouth of the channels in the lining of the side walls of the bath is made at the level of its slopes.

FIG. 1 schematically shows the proposed unit for steelmaking, longitudinal section; in fig. 2 - the same, top view.

The unit consists of two furnaces 1} i 2, interconnected by a duct 3, having a shut-off device 4 for them. The furnaces have electrodes 5 that can be alternately installed in the furnace / ive furnace 2. In the arch of each furnace there is a bunker 6 for supplying the iron ore to the furnace material. Gas manifolds 7 and 8 are located on the outer side of the furnace bodies, each of which is connected

channels 9 with the furnace working space and with the exhaust device 10 through nozzles 11 and 12, having shut-off devices (gates) 13 and 14. In the arch there are devices 15 for

supply to the working space of the furnace, for example, natural gas.

The smelting process in the proposed drying oven is as follows. In the furnace 1 load scrap, and through the hopper

6 - pre-reduced iron ore in the form of pellets. At this time, in the adjacent furnace 2, the melting is adjusted using electrodes 5. At the same time, natural gas is supplied to the furnace 2 through the device 15 and

steam, which in the arc zone form carbon monoxide and hydrogen. The mixture of carbon monoxide and hydrogen through the duct 3 enters the working space of the furnace 1, is sucked through the charge contained in it, and is discharged through channels Y to the collector 7. During the period of intense carbon burnout, the consumption of natural gas can be reduced or shut off completely. When furnace 2 is reached required

Temperature and carbon content in the metal are produced by melting. The electrodes are transferred to furnace 1 and begin the process of melting the charge therein. At the same time, the movement direction is changed by closing

gate 13 and open gate 14. Next to

furnace 2 load charge. Thus, the melting in furnaces 7 and 2 is alternately carried out.

Subject invention

A steelmaking unit containing two electric arc furnaces, whose working spaces are interconnected by a gas duct through a gas collector located on the outside of the housing and channels in the lining of the side walls of the bath, characterized in that, in order to draw reducing gas through the charge, the channels in the lining side walls, baths are made at the level of its slopes.

Fig.}

 1 W 101312

FIG. 2