RU163050U1 - FRESHWATER FRESHWATER - Google Patents

Abstract

The utility model relates to the field of mining and metallurgical industry and can be used for firing metallurgical raw materials on the grill of a roasting machine. The grate of the roasting machine includes upper and lower support horns, spacer bars, a working fluid formed by the upper surface, lower surface, and also side surfaces. On both side surfaces from the working surface to the lower surface along the direction of movement of the heat-carrying gas with expansion, grooves are made, while their smallest width is equal to or less than the particle size of the calcined metallurgical raw materials, for example, the diameter of the pellets. EFFECT: increased productivity of the roasting machine by increasing the flow of heat-carrying gas between the grates by increasing the clearance between them. 2 s.p. f-ly, 4 ill.

Description

Grate of the roasting machine

The utility model relates to the field of mining and metallurgical industry and can be used for firing metallurgical raw materials on the grill of a roasting machine.

The productivity of the roasting machine largely depends on the magnitude of the flow of heat-carrying gas through the layer of calcined metallurgical raw materials, which, in turn, is determined by the resistance to the passage of gas through the layer of calcined raw materials and through the grate. The resistance of the grate is determined by the gap between the grates. The larger the gap, the lower the resistance for gases.

The size of the gap cannot exceed the value at which particles of metallurgical raw materials can wake up through the gap down under the grate. The specified limitation of the gap limits the magnitude of the flow of heat-carrying gas, and, consequently, the performance of the roasting machine.

The grate is described in A.S. USSR No. 1668836, the design of which provides the maximum possible inter-spike gap due to contact between the spacer bars of adjacent (neighboring) grates. However, a further increase in the gap is impossible due to the ingress of particles of metallurgical raw materials, for example, pellets.

Another grate is known by A.S. USSR No. 851064, adopted as a prototype. In this grate, the resistance to the passing heat-carrying gas is reduced by performing the body of the grate of a triangular shape, and the distance bars (tides) are also made of a triangular shape, with vertices to the working surface.

However, this design does not provide a sufficiently intense flow through the roasting machine, since the size of the gap is determined by the size of the roasted particles of metallurgical raw materials, for example, the diameter of the pellets.

The task to which the proposed technical solution is directed is to increase the productivity of the roasting machine by increasing the flow of heat-carrying gas between the grates, by increasing the clearance between them.

The problem is solved in that in the grate of the roasting machine, including the upper and lower supporting horns, distance bars, the working fluid formed by the upper working surface, lower surface, as well as side surfaces, in accordance with the proposed utility model on both side 2

on the surfaces along the direction of movement of the heat-carrying gas with expansion, grooves are made, the smallest width of which is equal to or less than the particle size of the calcined metallurgical raw materials, for example, the diameter of the pellets. Moreover, depending on the design of the grate, the length of the grooves may be equal to the width of the side surface in that place of the side surface where the grooves pass, and may be less than the width of the side surface in the place where the grooves pass.

The amount of clearance between the grates can be adjusted by the gap between the grates, which is determined by the full height of the distance bars, as well as the width and depth of the grooves. In this case, the maximum values of the gap between the grates and the width of the grooves are interconnected and limited by the particle size of the calcined metallurgical raw materials, for example, the diameter of the pellets, which should not wake up in the gap between the grates. The presence of grooves reduces the cross section of the body of the grate and thereby reduces its strength. Therefore, the maximum depth of the grooves is limited by the load on the weight of the calcined metallurgical raw materials. The shape of the cross-section of the grooves (rectangular, round, etc.) with an equal cross-sectional area has little effect on the magnitude of the flow of heat-carrying gas and is selected based on the minimum complexity of manufacturing.

The required amount of heat-carrying gas flow through the gaps between the grates is ensured by the grooves on both side surfaces of the grate.

To prevent clogging of the grooves with small particles of metallurgical raw materials, the grooves expand in the direction from the working surface to the lower surface (from top to bottom in the working position). The proposed solution considers the smallest groove width.

The proposed utility model is illustrated by drawings, in which

FIG. 1 depicts a grate, made in accordance with a utility model, front view;

FIG. 2 depicts a grate, made in accordance with a utility model, top view;

FIG. 3 shows a grate, made in accordance with a utility model, in section AA in FIG. one;

FIG. 4 shows a grate, made in accordance with a utility model, in a section BB in FIG. one;

As shown in FIG. 1 and FIG. 2, the grate includes the upper supporting horns 1;

3

lower supporting horns 2; distance strips 3 with full height (G), that is, with a height equal to the distance between the side surfaces of adjacent grates; distance bars 4 with incomplete height, as they are located opposite the same distance bars on the adjacent grate. The sum of the heights of these distance bars is equal to the distance between adjacent side surfaces of the grates. The working body 5 of the grate includes the upper working surface 6 and the lower surface 7, as well as the side surfaces 8 of the body of the grate and the grooves 9. Two cross sections of the grate (A-A and B-B) are shown in FIG. 3 and FIG. four.

In this embodiment, the grate the width of the upper working surface is significantly greater than the width of the lower surface (high taper of the grate body in a vertical plane). For this reason, the length of the grooves (L) is less than the width of the side surface (E) (Fig. 3, 4),

In order for particles of metallurgical raw materials with sizes smaller than standard values, for example, pellets with a diameter smaller than that established by the technological process, freely wake up along the grooves 9 down and not clog them, the grooves 9 are made expanding downward (M is larger than B) (Fig. 1).

In that case, if the taper of the working fluid in the vertical plane is small, then the grooves 9 are made to the entire height of the side surface 8.

The smallest width of the grooves In (Fig. 1) should be equal to or less than the particle size of the calcined metallurgical raw materials, for example, the diameter of the pellets. Particles of metallurgical raw materials (except for pellets) have an irregular geometric shape, therefore, when calculating the smallest groove width, the size of the minimum side of the particles (for example, the smallest side of the box) is used. For pellets, its diameter is used. However, in any metallurgical raw material there is always an insignificant amount of particles with sizes less than the established standard values, including pellets with a diameter less than that established by the technological process of their manufacture. Such particles wake up in slots down under the bogie of the roasting machine. With fixed particle sizes of metallurgical raw materials and the diameter of the pellets, the gap between the grates with grooves should be reduced taking into account the increase in clearance in front of the grooves. The gap between adjacent grates is regulated by the total height G of the distance bars 3 (FIG. 1, FIG. 2) or by the sum of the incomplete height of the distance bars 4 located opposite each other on adjacent grates (FIG. 1, FIG. 2).

The proposed grate works as follows. Grooves with grooves, 4

made on both side surfaces along the direction of movement of the heat-carrying gas, they are installed in the firing machine trolley and together with the trolley they move along the technological zones of the firing machine

When implementing the utility model, when the grooves of each grate were located opposite the gap between the grooves of the neighboring grate, the width of the grooves at the level of the upper surface was 13% less than the diameter of the pellets. In the direction of the lower surface, the width of the grooves increases, and their length is approximately two times less than the width of the side surface. The total number of grooves in one gap between adjacent grates is 14 pieces. Due to this, the gap area increases by 12%, which solves the problem - it increases the flow of heat-carrying gas also by about 12%. The increase in the flow of heat-carrying gas proportionally accelerates the process of firing pellets, which allows to increase the productivity of the firing machine by increasing the speed of the carts or increasing the thickness of the layer of pellets. Thus, a technical result is achieved in the proposed technical solution.

Claims (3)

1. The grate of the roasting machine, including the upper and lower supporting horns, spacers and the working fluid formed by the upper, lower and side surfaces, characterized in that on both side surfaces of the working fluid along the direction of movement of the heat-carrying gas with expansion grooves are made, the smallest width of which less than or equal to the particle size of the calcined metallurgical raw materials. 2. The grate of the roasting machine according to claim 1, characterized in that the length of the grooves in the place of their execution is equal to the width of the side surface. 3. The grate of the roasting machine according to claim 1, characterized in that the length of the grooves in the place of their execution is less than the width of the side surface.

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