JPH0447002B2 - - Google Patents

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 accordingly, the top material charging device has also become larger. When charging raw materials from the top of the furnace, it is extremely important to control and manage the charging distribution in terms of operational aspects such as furnace conditions and 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, depending on the tilting angle 3 of the in-furnace chute, the injection angle 21 and collision energy on the surface of the in-furnace raw material differ, making it difficult to control the charging distribution. .

(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 about 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. In the furnace top material charging device for a vertical furnace, which is characterized by The charging chute is configured to be able to rotate around an axis that does not form the same plane as the furnace axis and is inclined with respect to the horizontal plane, and furthermore, the final outlet portion of the charging 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 the materials are oriented parallel to each other.

The configuration of the present invention will be explained based on the embodiment diagrams of FIGS. 1A, B, and C.

In the present invention, a gear 5 is rotated by a drive device 4 using a differential reduction mechanism, and a swing base 6 connected to the gear 5 and an upper chute 7 installed on the swing base are rotated around a furnace shaft 1. Rotate. Similarly, the gear 8 is rotated by the drive device 4, and the rotational force is sequentially transmitted to the gears 9, 10, 11, 12, 13, 14, and bearings 15, 15' fixed to the swing base 6.
The charging chute 16 supported at is rotated.

The rotation axis 17 of the charging chute 16 does not form the same plane as the furnace axis 1, and is provided at a position inclined to the water surface by an angle of repose of the raw material or more.

A dust sealing mechanism 18 such as a gland packing may be provided at the portion where the charging chute 16 penetrates the rotating base 6 to prevent dust from entering the furnace.
A cover plate 19 is provided to completely cover the raw material receiving opening provided in the upper part of the rotary base 6 to prevent dust generated during raw material charging and dust inside the furnace flowing back from the charging chute 16 from entering the upper part of the rotating base 6. It can also be prevented. Furthermore, the effect can be improved by maintaining the pressure in the space within the rotating base 6 above the furnace top pressure.

(Operation of the Invention) The furnace top raw material charging device according to the present invention charges raw materials to any location in the furnace by rotating the charging chute 16 that revolves around the furnace axis 1 around its rotation axis 17. can. In other words, by rotating the charging chute 16 on its rotation axis 17, the lower end 16-a of the charging chute outlet can move in the radial direction of the furnace while tracing a partial locus 20 of an ellipse in orthogonal projection. . As an example, as shown in Figure 2 A and B,
The raw material can be charged into a part of a certain radius of the furnace by rotating at an arbitrary angle, and by the revolution of the charging chute 16, the raw material can be charged into the furnace along a circular trajectory α to β to γ. Furthermore, when charging from the center to the periphery of the furnace in the radial direction, the charging chute 16 rotates on the rotation axis 17 that is not on a horizontal plane, so the lower end 16-a of the outlet of the charging chute is perpendicular to the rotation axis 17. The raw material is fed into the furnace while moving along an arcuate trajectory on the oblique plane. At this time, the lower end of the charging chute outlet 1
The vertical movement amount h of the charging chute 6-a is such that the lower end 16-a' of the charging chute in the conventional bellless charging device moves on a vertical plane, whereas the lower end 16-a' of the charging chute in the device according to the present invention moves on a vertical plane. Since a moves on an oblique plane, it can be made much smaller, and when charging all parts in the radial direction of the furnace, it is possible to equalize the charging conditions at the lower end level of the outlet of the charging chute 16. .

Next, as shown in Figure 3A and B, the charging chute 1
All of In charging the radial portion, the angle 21' between the raw material flow direction and the horizontal plane at the lower end 16-a of the outlet can always be kept constant, and the raw material charging angle 21 can also be made uniform. can. In addition, in order to make the raw material flow direction at the rotation axis 17 and the outlet section 16-b almost parallel, the charging chute should be bent in at least two stages as shown in Fig. 4. When charging the raw material into the furnace from 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 the flow inside the furnace decreases. The energy of the raw material when it collides with the raw material surface becomes smaller and more 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.

By providing the outlet portion 16-b at the lowermost end of the charging chute 16 as described above, it becomes possible to direct the outlet portion 16-b in the tangential direction 23 as shown in FIG. 4 with respect to rotation about the furnace shaft 1.

That is, the direction 23 of the raw material flowing out from the outlet portion 16-b and the rotation direction 22 of the rotating base 6 are reversed,
By adjusting and controlling the rotation speed, when the raw material falls and collides with the raw material surface in the furnace, the velocity component with respect to the raw material surface in the furnace is only the vertical velocity component (Vv), and the horizontal velocity component (Vн) with respect to the raw material surface in the furnace is the raw material. By canceling its own horizontal velocity component (V _Ha ) with the horizontal velocity component (V _HB ) of the inertia of the raw material due to the rotation of the swirl base, it can be made zero or as small as possible. As a result, the raw material can be charged 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 particle size in the circumferential direction at any radius is It can be made uniform and the grain size in the radial direction can also be easily controlled.

It becomes possible to charge the material with low collision energy to the material deposition surface, and the uniform distribution of the 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 to 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]

FIG. 1A is a plan view of an embodiment of the present invention, FIGS. 1B and C are side views of the same, and FIG. 2A is a plan view of an embodiment of the present invention.
~Explanatory diagram of charging operation according to the present invention of A line, Fig. 2B
3A is an explanatory diagram of the same as above, FIG. 3A is an explanatory diagram of the charging operation according to the present invention taken from FIG. 3B, line A to A, FIG. Fig. 5 is a schematic cross-sectional view of a conventional bell-less type furnace top charging device. V...Outflow velocity of the raw material itself, V _Ha ...Horizontal velocity component of the raw material itself, Vv...Vertical velocity component of the raw material itself, V _HB ...Horizontal velocity component of the inertial force of the raw material due to rotation based on swirling , V _H ...Actual horizontal velocity component of the raw material relative to the raw material surface in the furnace. 1 is the furnace shaft,
2 is a conventional chute, 3 is a conventional tilt 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
1 is a gear, 15, 15' is a bearing, 16 is a charging chute, 16-a is an outlet lower end, 16-b is an outlet part, 17 is an autorotation shaft, 18 is a dust seal mechanism, 1
9 is a cover plate, 20 is a locus, 21 is a closing angle, 21' is a horizontal angle, 22 is a rotation direction, and 23 is a connection direction.

Claims (1)

[Claims] 1. In a charging chute for charging raw materials installed in the upper part of a vertical furnace so as to be able to revolve around the furnace axis, the charging chute does not form the same plane as the furnace axis. , and configured to be able to rotate about an axis inclined with respect to a horizontal plane, and further characterized in that the final exit portion of the charging chute is oriented in a direction that intersects with the rotation axis of the charging chute. , top material charging equipment for vertical furnaces. 2. In 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 not on the same plane as the furnace axis, and is not aligned with the horizontal plane. A vertical furnace configured to be rotatable about an inclined axis, 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. Top material charging device.