JPS6159178A - Furnace-top raw-material charger for vertical type furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a top material charging device for a vertical furnace such as a blast furnace.

(Prior Art) In recent years, blast furnaces have become larger and, along with this, the furnace top material charging devices have also become larger. When charging υ raw material from the top of the furnace, it is extremely important to control and manage the charging distribution in terms of operation, such as the furnace condition and the utilization rate of gas in the furnace.

In a conventional bell-less type furnace top material charging device such as that disclosed in Japanese Patent Publication No. 56-25245 shown in FIG. However, it has the disadvantage that it is difficult to control the charging distribution because the injection angle 21 and collision energy of the raw material surface in the furnace differ depending on the tilt angle 3 of the chute in the furnace. Was.

(Problems to be Solved by the Invention) The present invention improves the above-mentioned drawbacks, makes it possible to charge a predetermined raw material at a predetermined location, and to reduce the input angle 21, collision energy, etc. to the raw material surface in the furnace during charging. The purpose of this project is to make the charging conditions almost uniform in all parts and improve the control and management of the charging distribution, thereby expanding the effective use of gas in the blast furnace and increasing the degree of operational freedom.

(Means for Solving the Problems) The present invention provides a charging chute for charging raw materials that is installed in the upper part of a vertical furnace so as to be able to revolve around the furnace axis. The charging chute is configured to be able to rotate around an axis that does not form the same plane as the horizontal plane and is inclined with respect to the horizontal plane, and further, the final exit portion of the charging chute is oriented in a direction that intersects the rotation axis of the charging chute. A furnace top material charging device for a vertical furnace characterized by The input chute does not form the same plane as the furnace axis and is configured to be able to rotate around an axis that is inclined with respect to the horizontal plane, and furthermore, the final exit portion of the i-person chute is approximately parallel to the rotation axis of the charging chute. This is a top material charging device for a vertical furnace, characterized in that it is oriented so that the

The structure of the present invention will be explained based on the embodiment diagrams of FIGS. 1(5), 1(g), and 1(q).

The present invention provides a gear 5 in a drive device 4 using a differential speed reduction mechanism.
is rotated to rotate the rotating base 6 connected to the gear 5 and the upper chute 7 installed on the rotating pace around the furnace shaft 1. Similarly, the drive device 4 rotates the gear 8,
The rotational force is sequentially applied to gears 9.10.11.12.13.1
Bearing 15.1 transmitted to 4 and fixed on the pivoting pace 6
The charging chute 16 supported at 5' is rotated.

The rotation axis 17 of the charging chute 16 does not form the same plane as the furnace axis l, and is provided at a position inclined to the horizontal plane by more than the angle of repose of the raw material.

In order to prevent dust from entering the partial ore furnace where the charging chute 16 penetrates the rotating pace 6, a dust sealing mechanism 18 such as a gland packing may be provided. A cover plate 19 that completely covers the receiving opening is provided to prevent dust generated during raw material charging and dust inside the furnace flowing back through the charging chute 16 from entering above the rotating base 6. You can also do it. Furthermore, the effect can be improved by maintaining the pressure in the space within the rotating pace 6 above the furnace top pressure.

(Operation of the Invention) The furnace top raw material charging device according to the present invention allows the raw material to be delivered to any part of the furnace by rotating the charging chute 16 that revolves around the furnace axis 1 around its rotation axis 17. Can be loaded. By rotating the pick-up charging chute 16 around its rotation axis 17, the lower end 16-α of the charging chute outlet moves in the radial direction of the furnace while tracing a partial trajectory of an ellipse in orthogonal projection. be able to. - For example, see Figure 2 (8) 1. As shown in @, the raw material can be charged into a certain radius of the furnace by rotating at an arbitrary angle, and the raw material can be charged into the furnace along a circular trajectory α~β~r as the charging chute 16 revolves. is possible. Furthermore, when charging from the center to the periphery in the radial direction of the furnace, the charging chute 16 rotates on its own axis 17 which is not on a horizontal plane, so the lower end of the outlet of the charging chute 1 is perpendicular to the axis of rotation 17. The raw material is fed into the furnace while moving along an arcuate trajectory on an oblique plane. At this time, the charging chute outlet lower end 16
-a, the lower end 16-α' of the outlet of the conventional bell-less charging device moves on a vertical plane, whereas the lower end 16-α of the charging chute outlet of the device according to the present invention moves on a vertical plane.
Since cL moves on an oblique plane, it can be made much smaller υ, and when charging all parts in the radial direction of the furnace, the charging conditions at the lower end level of the outlet of the charging chute 16 can be made uniform. I can figure it out.

Next, in Figure 3 (5), (as shown in the figure, the charging chute 16
an outlet portion 16-b is formed at the bottom of the outlet portion 16-b;
-b by making the flow direction of the raw material from the lower end 16-α of the outlet almost parallel to the rotation axis 17 of the charging chute
In all radial section charging, the outlet lower end 16-,z
The angle 21' formed between the flow direction of the raw material and the horizontal plane can be kept constant at all times, and the input angle 21 of the raw material can also be made almost uniform. In addition, the rotation axis 17 and the exit portion 16-
In order to make the flow direction of the raw materials almost parallel at point b, the charging chute should be bent in at least two stages as shown in Fig. 4. Before the raw material enters the furnace through the charging chute 16, it always collides with the outlet section 16-b and changes the flow direction, so the kinetic energy of the raw material decreases, and when it collides with the raw material surface in the furnace, The energy of the raw material is small and uniform.

As described above, the furnace top material charging device of the present invention can equalize the material charging conditions at all charging sites in the furnace.

As mentioned above, the outlet portion 16- is located at the lowest end of the charging chute 16.
By providing b, the fourth
As shown in the figure, it becomes possible to direct the beam in the tangential direction B.

1. That is, by reversing the direction (B) of the raw material flowing out from the outlet portion 16-b and the rotating direction (n) of the rotating base 60, and adjusting and controlling the rotation speed, when the raw material falls and collides with the raw material surface in the furnace, it is possible to The velocity component is only the vertical velocity component (Vma), and the horizontal velocity component with respect to the raw material surface in the furnace (
V[I] is the horizontal velocity component of the raw material itself (VI!-), and the horizontal velocity component of the inertia of the raw material due to rotation based on the rotation (V
By canceling with an ), it can be made zero or as small as possible. This makes it possible to charge the raw material from the charging chute 16 almost straight onto the surface of the raw material in the furnace, and even if there is a sized raw material in the charging chute 16, the raw material can be charged in the circumferential direction at any radius. The particle size of can be made uniform, and the particle size can also be easily controlled in the radial direction.

It is possible to charge the raw material with low collision energy to the material deposition surface, and the uniform distribution of the raw material is greatly improved.

(Effects of the Invention) As described above, the present invention allows raw material to be charged to any location from the center of the furnace to the periphery of the furnace, and when charging all locations, the charging state of the raw material into the furnace can be almost controlled. This makes it possible to easily control the charging distribution in terms of both quantity and particle size.

This greatly expands the degree of freedom in blast furnace operation, and has an extremely large effect on the productivity and economy of the blast furnace.

[Brief explanation of the drawing]

Figure 3) is an explanatory diagram of the charging operation according to the present invention, Figure 4 (5), (B), 0 is an explanatory diagram of the charging operation according to the present invention, and Figure 5 is a conventional bellless diagram. A cross-sectional schematic diagram of a type furnace top charging device. ■...Outflow velocity of the raw material itself, vIIIα...Horizontal velocity component of the raw material itself, Vma...Vertical velocity component of the raw material itself, v[IB...Inertia of the raw material due to rotation based on swirling Horizontal velocity component of force, V [I... Actual horizontal velocity component of the raw material relative to the raw material surface in the furnace. 1 is the furnace axis, 2 is the conventional chute, 3 is the conventional tilting angle, 4
is a drive device, 5 is a gear, 6 is a swing base, 7 is an upper chute, 8.9.10.11.12.13.14 is a gear,
15.15/ is bearing, 16 is charging chute, 16-, $
is the lower end of the outlet, 16-b is the outlet portion, 17 is the rotation axis, 1
8 is the dust seal mechanism, 19 is the cover plate, beauty is the locus, 21 is the official angle, 21' is the horizontal angle, n is the rotation direction, and o is the connection direction. Patent Applicant: Nippon Steel Corporation 7th Ward (A) 2 Figure LA) Large 2 Figure <B1 Toku Tog Care Ward (A)

Claims (2)

[Claims] (1) In the charging chute for charging raw materials installed in the upper part of the vertical furnace so as to be able to revolve around the furnace axis, the charging chute should not be on the same plane as the furnace axis, but on a horizontal plane. A vertical furnace configured to be rotatable about an axis inclined to the opposite direction, and further characterized in that a final outlet portion of the charging chute is oriented in a direction that intersects the rotation axis of the charging chute. Furnace top raw material charging device. (2) In the charging chute for charging raw materials, which is installed in the upper part of the vertical furnace so that it can revolve around the furnace axis, the charging chute is not on the same plane as the furnace axis, but on a horizontal plane. A vertical furnace configured to be rotatable about an axis inclined to the shaft, and further characterized in that the final outlet portion of the charging chute is oriented substantially parallel to the rotation axis of the charging chute. Furnace top raw material charging device.