JPS59211515A - Charging device for charge - Google Patents

Abstract

PURPOSE:To deposit charge to a prescribed position with good accuracy by providing a chute which is movable simultaneously in the height, circumferential and radial directions of a moving bed type reaction furnace such as a blast furnace to the inside top of said furnace. CONSTITUTION:A movable stand 15 which is vertically movable is provided to the inside top of a blast furnace 1, and a rotary stand 14 which is made rotatable around the axial core of the furnace is provided thereto. A guide 18 is provided thereto in such a way that the guide can move back and forth in the diameteral direction of the furnace 1. A funnel-shaped chute 10 which is made into a funnel shape and is provided with a passage inclined to one direction is provided to said guide. Driving devices 11, 12, 13 are driven to move the chute 10 in the height, circumferential and radial directions of the furnace thereby depositing the charge fed from a hopper 7 at the furnace top through a flow rate regulating valve 8 to the prescribed position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a charge charging method that allows solid raw materials such as ore and coke to be charged accurately at any position at the top of a moving bed reactor such as a blast furnace or a direct reduction furnace. It is related to the device.

In moving-bed reactors such as blast furnaces and direct reduction furnaces, solid raw materials such as ore and coke are charged from the top of the furnace, and high-temperature air or reducing gas is blown into them from the blower panels at the bottom of the furnace.

Since these furnaces have a large furnace diameter of 5 to 10 m, the gas flow distribution within the furnace varies in the radial direction and circumferential direction depending on the deposition status of the solid raw material.

In general, it has been empirically determined that it is desirable for the gas flow in the furnace to be large in a narrow area at the center of the furnace, small near the furnace walls, and flat in the middle of the furnace. The purpose of increasing the gas flow rate at the center of the furnace is to maintain a stable flow of gas, and the purpose of decreasing it at the furnace wall is to reduce heat dissipated from the furnace body. In the circumferential direction of the furnace, it is desired that the gas flow be circumferentially balanced.

For this reason, conventionally, in blast furnaces, a bell-shaped charging device with a movable repulsion plate (movable armor) attached, and a bell-less charging device with a rotating chute are being introduced.

On the other hand, in direct reduction furnaces, as the diameter of the furnace increases, methods such as increasing the number of cylindrical charging chutes that communicate from the top hopper into the furnace in the circumferential direction of the furnace are adopted.

FIGS. 1(α), (b), and (C) show schematic diagrams of each device.

Figure 1 (j) shows a bell-shaped charging device of a blast furnace 1 with a movable repulsion plate 2 attached, and when the repulsion plate 2 is actuated by a drive device 3, the charge falls. point is changed.

Fig. 1(b) shows a bellless type charging device, and when the charging chute 4 of the blast furnace 1 is rotated in the circumferential direction, it is also tilted up and down, and the point at which the charge falls is changed. .

FIG. 1(c) shows a charging device for a direct reduction furnace 5, in which the charge is continuously supplied from a top hopper through a cylindrical charging chute 6.

Each of these charging devices has its merits and demerits, but it has not been possible to form a charge distribution that can stably maintain a desired gas flow distribution over a long period of time. That is, the movable repulsion plate attached to the bell-shaped charging device mainly only changes the thickness of the deposited layer on the furnace wall, but does not have the function of adjusting the thickness of the deposited layer in the furnace center or in the direction of the furnace circumference.

In addition, bellless charging equipment has the function of dispersing the charge in the circumferential direction of the furnace, but since the charge falls from an inclined rotating chute, strong particle size segregation occurs during the fall, and charging There is a drawback that the shape of the pile of objects cannot be set with high precision.

On the other hand, in the case of a reduction furnace, the cylindrical charging seat Q is set in a fixed state, so that the number of peaks of the charge corresponding to the number of chutes is formed in the circumferential direction of the furnace. For this reason, the gas flow does not always flow uniformly in the circumferential direction of the furnace, and it is also impossible to adjust the charge deposition status in the circumferential and radial directions of the furnace.

In a reactor such as a blast furnace, the gas flow distribution constantly changes depending on the particle size composition of the charge and the state of melting of the charge in the lower part of the furnace.

For this reason, the charge distribution at the top of the furnace must be constantly adjusted to maintain a proper gas flow distribution.

In order to solve the above-mentioned problems, it is necessary to use a device that allows the charge to be charged without causing particle size segregation at all times in the direction of the furnace radius, furnace circumference, and furnace height, and that forms an accurate burden distribution shape. Must. None of the conventional charging devices satisfy this condition.

In order to solve the problems of conventional charging equipment, 1) the charge should not fall into the furnace in an inclined trajectory;

■Keep the distance between the starting point of the charge and the landing point as small as possible.

■The dropping point (i.e., the landing point) can be freely selected anywhere on the furnace periphery or in the radial direction of the furnace, regardless of the charging level.

It is essential that the equipment satisfies the above conditions.

The present invention is a charging device that satisfies the above-mentioned conditions, and has the function of preventing grain size segregation during falling of the charge and depositing the specified charge at a predetermined position with high accuracy.

The present invention will be described in detail below based on the drawings.

FIG. 2 is a sectional view of a blast furnace showing an embodiment of the present invention.
Figure 3 is a view taken along line X--X in Figure 2.

As illustrated in FIGS. 2 and 3, the charging device of the present invention can be simultaneously moved into the top of a moving bed reactor such as blast furnace 1 in the furnace height direction, furnace circumferential direction, and furnace radial direction. It is characterized in that a funnel-shaped chute 10 is provided.

That is, in a furnace top charging device equipped with a fixed vertical chute 9 that guides the charge into the furnace from a furnace top hopper 7 installed at the top of the blast furnace 1 through a flow rate adjustment valve 8, there is no vertical movement inside the furnace top. A movable pedestal 15 capable of rotating is provided, a rotary pedestal 14 rotatable around the furnace axis is provided on the movable pedestal 15, and a funnel-shaped chute 10 formed by this rotatable pedestal 14 is provided.

The movable pedestal 15 is suspended by penetrating the steel shell IA with a plurality of struts. The rod 16 engages with a drive device 13 for vertical movement.

Further, a driving device 11 for rotating the rotary pedestal 14 is installed on the movable pedestal 15, and the rotary pedestal 14 can be rotated via gears n1 and B. Reference numeral 17 denotes a bearing or roller device provided to ensure smooth rotation of the rotating pedestal 14.

The rotary frame 14 is provided with a drive device 12 for reciprocating the guide 18, and the drive device 12 moves the guide 18 along the rails and grooves in the furnace radial direction passing through the furnace axis determined in advance. Can move radially.

In the figure, numeral 19 indicates the surface on which the contents in the furnace are deposited.

Since the present invention is constructed as described above, the drive device 11 that rotates the rotating frame 14, the drive device 12 that moves the guide 18 in the furnace radial direction, and the moving rod 16 are
By moving the driving device 13 simultaneously or independently, the position of the lower end of the funnel-shaped chute 10 can be arbitrarily adjusted to the circumferential direction inside the furnace top, the rotation speed, the radial direction of the furnace, and the vertical position. It is therefore possible to obtain the desired shape of the charge deposition surface 19.

Next, basic patterns that can be formed by the apparatus of the present invention will be described.

There are five basic distribution shapes that can be formed by the apparatus of the present invention. The method of driving the funnel-shaped chute for each type of charge distribution shape will be explained.

Type-1 is a charging method that creates a charge distribution shape equivalent to that obtained by a bell-type charging device, as shown in Figure 4 (α) and (a'). The position of the funnel-shaped chute is limited to the furnace wall and the chute is rotated.

Type-2 is a charging method that obtains the same distribution shape as the spiral charging method in a bellless charging device, as shown in FIGS. 4(b) and 4(b'). Rather than rotating the position of the funnel-shaped chute, move it from the furnace wall toward the furnace center (or in the opposite direction).

Type-3 is a charging method that cannot be realized with conventional charging equipment, as shown in FIGS. 4(e) and (e'). Set the required swing angle of the funnel-shaped chute rotation drive device, change the rotation direction of the drive device to forward or reverse, and move the chute from the furnace wall toward the furnace center (or in the opposite direction). .

Type-4 is a charging method that obtains a burden distribution shape similar to that of the charging device of a direct reduction furnace, as shown in Fig. 5 (α) and (α'). The funnel-shaped chute is fixed at a predetermined position in the radial direction of the furnace, and the phase is not shifted at a fixed angle each time it is charged in the circumferential direction of the furnace.

Type-5 is a charging method that cannot be achieved using conventional charging equipment, as shown in FIGS. 5(b) and 5(b'). Set the funnel-shaped chute at a predetermined position in the circumferential direction of the furnace and move it from the furnace wall toward the furnace center (or in the opposite direction). The phase of the same chute is shifted in the circumferential direction each time the chute is charged.

The drawings (α'), (b'), and (c) in each of the above figures show the charging state of the charge, and white indicates the convex portion and black indicates the concave portion.

Thus, with the charging device according to the invention, not only a charge distribution shape similar to that of the conventional device, but also a new distribution shape can be created.

Furthermore, since each distribution shape can be created with high precision, it is expected that the control of gas flow distribution will be dramatically improved.

Further, when ore or coke is classified by particle size and charged into a furnace, it is required that the deposition surface of the charge has a highly accurate and stable shape.

The charging device of the present invention can fully meet this requirement.

The charging device of the present invention is applicable not only to a moving bed type reactor but also to a powder storage hopper such as a silo, a hopper for storing powdery ore, solid fuel, etc. to be supplied to a sintering machine or a kiln. can also be applied.

[Brief explanation of drawings]

Figure 1 (α) is a cross-sectional view illustrating the movable repulsion plate of a bell-type blast furnace, and Figure 1 (b) is an FF illustrating a bell-less charging device.
Figure 1(c) is a sectional view illustrating a charging device for a direct reduction furnace, Figure 2 is a sectional view showing an embodiment of the present invention, and Figure 3 is a sectional view showing an embodiment of the present invention.
The figure is a view taken along the line X-X of Fang 2, Figure 4 (α), (b),
(e), (α, (b, (C) and Figure 5 (a), (
b), (α, and (b') are schematic diagrams illustrating the shape of deposits in the furnace formed using the EA device of the present invention. 1 is a blast furnace, 2 is a movable repulsion plate, 4 is a chute, 5 is a direct reduction furnace, 6 is a cylindrical charging chute, 7 is a furnace top hopper,
8 is a charging flow rate adjustment valve, 9 is a fixed vertical chute, 1o
is a funnel-shaped chute, 11.12.13 is a drive device, 14
1 is a rotating frame, 15 is a moving frame, 16 is a moving rod, 1
7 is a bearing, 18 is a guide, J9 is a deposition surface of the contents in the furnace, KA is a column, 21 is a frame, ρ, and O are gears. Patent applicant Nippon Steel Corporation 7 yen 20 Y3 Ward University Left Figure procedure amendment (method) September 22, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi 1 Indication of case Patent application No. 1984-84190 2 , Title of the invention Burrage charging device 3, Relationship to the person making the amendment Applicant (665) Nippon Steel Corporation 4, Agent No. 1B, Toranomon-chome, Minato-ku, Tokyo August 1981 1o day 6, subject of correction Ming! Detailed Description of the Invention in Book a, Drawings (1) In the specification, "(α')" in the second line of page 8 is amended to r (d) J. (2) In the same book, page 8, line 7, r (b') J is corrected to "(e)". (3) Yosuri, page 8, line 12, r (C') J is corrected to "(f)". (4) In the same book, page 8, line 18, "(α')" is corrected to "(C)". (5) In the same book, p. 9, line 3, amend r(b') J to 1(d). (6) Same book, page 9, line 9 [(α′ in each figure)
), (b, (C) [Figure 4 (d), (e)
, (f), Fig. 5 (C), (d)''. (7) Same book, page 10, line 14, “(α′), (b
'), (Csu') are corrected to '(d), (e), (f)'. (8) Same book, page 10, line 15, r (cL'),
(1)') Correct J to "(C), (d)". 9) The drawing numbers of Figures 4 (α'), (b'), (α') and Figures 5 (α and (b) are included in the attached drawings [Figure 4 (
d), FIG. 4(e), FIG. 4(f), FIG. 5(C), and FIG. 5(d). Sound 4 figure < d) 尤Am<已) Wa wo figure (f) Old 5 Bian (C) Rokuyome (c11

Claims (1)

[Claims] A charge charging device characterized in that a funnel-shaped chute that can be moved simultaneously in the furnace height direction, furnace circumferential direction, and furnace radial direction is provided inside the furnace top of a moving bed type reactor such as a blast furnace.