SU1740424A1 - Furnace for heat treatment of bulk materials - Google Patents

Abstract

Use: in the preparation of metallurgical raw materials in the steel industry. SUBSTANCE: furnace for heat treatment of bulk materials contains a working chamber, under with conveying tuyeres, a material loading unit with an inclined loading tray. Before the working chamber, on the bottom of the tray and on the opposite wall of the furnace, there are rows of air inclined nozzles. The nozzles are oriented in such a way that the axis of the nozzles of one row in the projection on the vertical plane intersects the axis of the nozzles of the opposite row at the place of installation of the latter on the wall of the furnace. In addition, the nozzles of opposite rows are shifted one relative to the other across the tray by half the pitch of their installation. The use of the device reduces dusting and prevents formation of dust. 3 il. fcj I

Description

The invention relates to the preparation of metallurgical raw materials, in particular to the reducing roasting of crushed brown iron ores.

The purpose of the invention is to reduce dusting and prevent build-up.

Figure 1 shows the furnace from the side of the loading section; FIG. 2 shows the node I in FIG. on fig.Z - section A - A in figure 2.

The furnace of a step-weighted layer has a working chamber 1, a comb under 2 with conveying tuyeres 3, a loading unit 4 with an inclined loading tray 5, in the bottom 6 of which and in the opposite inclined wall of the furnace 7 are installed offset relative to the longitudinal axis of the tray a row of inclined air nozzles 8 and 9. Air to the nozzles comes from the collectors 10 and 11. The nozzles are oriented in such a way that the axis of the nozzles 8 in the projection on the vertical plane crosses the axis of the nozzles 9 at the point of passage of the latter through the wall 7. The nozzles 8 are offset relative to the opp He ate 9 across the tray at half the pitch of their installation. R. The rotor nozzles 9 are mounted on the edge of the wall 7 facing the oven chamber.

The furnace works as follows.

The mixture from the loading device 4 under the action of its own weight is poured along the tray 5, the passage through the air curtain created by the nozzles 8 and 9 and enters the working chamber 1, where it is heat treated in a step-weighted layer formed under the influence of air-gas flows emanating from the tuyeres 3. Two r yes located in chess VI I

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In the order of air streams emanating from opposing nozzles 8 and 9, the boot opening is effectively sealed against knocking out furnace gases. Air jets emanating from the nozzles 8 drop small fractions of the charge from the bottom b, prone to sticking to the surface of the loading tray and due to the orientation on the outlets of the nozzles 9 direct them towards the edge of the inclined wall 7. Due to the transverse displacement of the nozzles 8 and 9 by half their installation steps, the dropped particles of the charge pass between the air jets emanating from the nozzles 9, and, as a result of the gravitational curvature of the trajectory, the edge of the wall 7 fall into the space of the working chamber 1.

The use of the device provides for a reduction in gas and dust emission from the furnace and an increase in the reliability of its operation due to the improved conditions for the discharge of charge on the charging tray and preventing incrustation.

Claims (1)

The inventive formula and the furnace for heat treatment of bulk materials, containing a working chamber, underneath with conveying tuyeres, a material loading unit with an inclined loading tray, characterized in that, in order to reduce dusting and prevent incrustation, the furnace is equipped with rows in front of the working chamber on the bottom of the tray and on the opposite wall of the oven, made inclined, offset relative to the longitudinal axis of the tray, while the intersection point of the axis of the nozzles located on tray bottom, with opposite row nozzle axis and a projection on a vertical plane is located at the installation site of the latter on the inclined wall of the furnace, and the nozzle One row is offset from the nozzles of the opposite row and across the tray by half the pitch of their installation. FIG. one FIG. 2 A-l fie.Z