JP5758322B2 - Charging chute and charging device - Google Patents

Description

  The present invention relates to a charging chute and a charging device for charging raw fuel into a blast furnace furnace.

As is well known, for example, a bellless charging device using a turning chute is known as means for charging raw fuel such as sintered ore and coke into a blast furnace.
When charging raw fuel into a blast furnace using a bellless charging device, a chute with a U-shaped cross section is generally used, but since the upper part is open, the turning speed and charging speed are increased. There was a problem that raw fuel overflowed from the chute when it increased.
Therefore, a technique for preventing the overflow of raw fuel by using a chute as a cylinder is disclosed (for example, see Patent Document 1).

JP 2010-133000 A

  However, when the technique disclosed in Patent Document 1 is used, the phenomenon that the raw fuel overflows from the chute is eliminated, but the raw fuel charged into the blast furnace from the chute is dispersed and is not charged at a predetermined position. Turned out to be.

  In view of this, the inventor has intensively studied the behavior of the raw fuel when the raw fuel is charged by the charging chute and the technique for stably charging the raw fuel at a predetermined position. In the case of a cylindrical chute, when the raw fuel is swirled by the chute, spirally circulates in the chute, and is discharged from the discharge port, it is known that it is moved by the centrifugal force of the circulation and dispersed in the blast furnace. It was.

  The present invention has been made in view of such circumstances, and suppresses the raw fuel from overflowing from the charging chute and being dispersed in the blast furnace when charging the raw fuel into the blast furnace. An object is to provide a possible charging chute and a charging device.

In order to solve the above problems, the present invention proposes the following means.
The invention according to claim 1 is provided with a flow path that is disposed in the upper part of the blast furnace and supplies raw fuel into the blast furnace, and rotates around the axis while the flow path is inclined with respect to an axis extending in the vertical direction. A charging chute for charging raw fuel into a blast furnace while being moved, wherein a cylindrical portion is formed on the tip side, and the rotation suppression means is a polygonal or multi-arrangement disposed on the inner periphery of the cylindrical portion. It is provided with a rounding suppression shape portion constituted by a part of a rectangular side, and at least a contact surface when the raw fuel flows in the flow path is formed within the range of the rounding suppression shape portion. Features.

The invention according to claim 5 is a charging device, and is characterized by including the charging chute according to any one of claims 1 to 4 .

According to the charging chute and the charging device according to the present invention, the cylindrical portion is formed on the tip side, and the rotation suppressing means for suppressing the rotation of the raw fuel is formed in the cylindrical portion. Is prevented from spiraling. As a result, it is possible to suppress the raw fuel from being dispersed in the blast furnace. Further, of the flow path of the raw fuel in the cylindrical portion, the contact surface that contacts when the raw fuel flows is a polygon or a part of the polygon, that is, the contact surface of the flow path is configured by a set of straight lines. Therefore, for example, the movement of the raw fuel is suppressed at the intersection of the straight lines, and as a result, the circulation of the raw fuel is suppressed.
Here, the meaning of the distal end side where the cylindrical portion is formed may be that the cylindrical portion may be formed at the distal end, or a location where the upper part is opened closer to the distal end side than the cylindrical portion is formed. Means good.

According to a second aspect of the invention, a charging chutes according to claim 1, wherein the circumferential suppressing shaped section is characterized by being composed by square 12 square.

  According to the charging chute according to the present invention, since the rounding suppression shape portion is formed of a quadrangular shape to a dodecagonal shape, the rounding of the raw fuel can be efficiently suppressed. This is because the circumference suppressing shape portion is a quadrangle to a dodecagon, and the length of each side is shorter than the angle (inner angle) formed by the adjacent side is small, so the adjacent side It is presumed that it becomes difficult to secure the kinetic energy that moves to the position by turning the charging chute.

According to a third aspect of the present invention, there is provided a flow path that is disposed at an upper portion of the blast furnace and supplies raw fuel into the blast furnace, and the flow path is rotated around the axis while being inclined with respect to an axis extending in a vertical direction. A charging chute for charging raw fuel into a blast furnace while being moved, and a cylindrical portion is formed on a tip side thereof, and the raw fuel is prevented from circulating in the cylindrical portion in the cylindrical portion. The rotation suppression means is formed, and the rotation suppression means is a recess formed in an inner periphery of the cylindrical portion and extending in a direction in which the cylindrical portion extends. In the charging chute described above, the rotation suppressing means is a recess formed in an inner periphery of the cylindrical portion and extending in a direction in which the cylindrical portion extends.

  According to the charging chute according to the present invention, since the concave portion is formed in the cylindrical portion, a part of the raw fuel becomes a stagnant raw fuel in the concave shape and the movement resistance in the circumferential direction of the raw fuel is reduced. As a result, the circulation of the raw fuel is suppressed.

A fourth aspect of the present invention is the charging chute according to any one of the first to third aspects, wherein the maximum length L1 and the minimum length L2 on the inner peripheral side of the cross-section of the cylindrical portion. The aspect ratio (L1 / L2) defined by the ratio is 1.8 or less.

  According to the charging chute according to the present invention, since the aspect ratio (L1 / L2) is 1.8 or less, it is efficient while suppressing the dispersion of the raw fuel in the flow path when the cross-sectional area is the same. Flow is ensured.

  According to the charging chute and the charging device according to the present invention, the cylindrical portion is formed on the distal end side, and the rotation suppressing means for suppressing the rotation of the raw fuel is formed in the cylindrical portion. Circulating the inside of the cylindrical portion while suppressing overflow from the incoming chute is suppressed. As a result, it is possible to suppress the raw fuel from being dispersed in the blast furnace.

It is a figure explaining the blast furnace charging device which concerns on 1st Embodiment of this invention. It is a figure which shows the charging chute concerning 1st Embodiment of this invention, (A) is a side view, (B) is a figure which shows the XX cross section of (A). It is a figure explaining the dispersion degree which concerns on this invention. It is a figure explaining the relationship between the shape of the cylindrical part of the charging chute concerning this invention, and dispersion degree. It is a figure explaining the relationship between the aspect-ratio and dispersion degree of the charging chute concerning this invention. It is a figure which shows the charging chute based on the 2nd Embodiment of this invention, (A) is a side view, (B) is a figure which shows the YY cross section of (A). It is a figure which shows the charging chute | shoot concerning the 3rd Embodiment of this invention, (A) is a side view, (B) is a figure which shows the ZZ cross section of (A).

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a diagram showing a schematic configuration of a blast furnace charging device (charging device) according to the first embodiment. Reference numeral 1 denotes a blast furnace, reference numeral 2 denotes a blast furnace body, and reference numeral 3 denotes a blast furnace charging apparatus. Show. FIG. 2 shows an example of a charging chute 10 used for the blast furnace charging device 3.

  The blast furnace charging device 3 includes a raw fuel charging cylinder 4, a charging chute 10, a turning means (not shown), and a tilting means, and is disposed on the upper portion of the blast furnace main body 2. The raw fuel is charged into the blast furnace while turning in the direction of the arrow R around the vertical axis O while changing the inclination with respect to the direction of the arrow T.

  As shown in FIG. 2, the charging chute 10 has, for example, a supply port 11 through which raw fuel is supplied and a discharge port 12 through which raw fuel is discharged, and a flow path 13 through which the raw fuel flows. Is formed. Further, the charging chute 10 has a regular octagonal (circularity suppression shape portion) 15 in a cross section perpendicular to the flow path 13 and has a tapered shape in which the discharge port 12 side is formed thin, and the entire length including the tip side is included. It is a cylindrical part.

  Further, the flow path 13 of the charging chute 10 has an aspect ratio (L1 / L2) defined by a ratio of a distance (maximum length) L1 between opposing vertices of a regular octagon to a distance (minimum length) L2 between opposite sides. Is 1.082 (<1.8).

Next, the degree of dispersion will be described with reference to FIG.
FIG. 3 is a diagram for explaining the degree of dispersion, FIG. 3 (A) is a diagram showing a charging chute S for obtaining the degree of dispersion, and FIG. 3 (B) is a diagram for defining the degree of dispersion.

  First, as shown in FIG. 3 (A), a notch angle α (for example, the charging chute S is operated while the target charging chute S is turned in the direction of arrow R around the turning axis O of the charging device). , 7 conditions from 50 ° to 24 °) are changed in the direction of arrow T, and the dispersion angle θ in which the raw fuel M shown in FIG. 3B is dispersed is obtained for each notch angle α, and the average value thereof is charged. The representative value of the chute S is used. The average value is based on a simple average.

  Then, the representative value (average value) of the dispersion angle θ in the case of a regular heptagon having the smallest dispersion angle θ is 1.0, and the representative value of the dispersion angle θ of each charging chute S is a regular heptagon dispersion. The relative value obtained by dividing by the representative value of the angle θ was defined as the dispersion degree of each charging chute S.

Next, the relationship between the charging chute and the degree of dispersion will be described with reference to FIGS.
FIG. 4 is a diagram showing the result of calculating the relation between each polygon and the degree of dispersion when the flow path of the charging chute is a regular polygon in cross section by simulation of the particle element method. According to FIG. 4, the degree of dispersion of the regular square is 4.0, and the regular square charging chute is dispersed because the degree of dispersion does not hinder production when raw fuel is charged in the blast furnace. A degree of 4.0 or less was set as a suitable value. Compared with a charging chute having a circular cross section, the degree of dispersion is about 40%.
From the above, it can be said that a quadrangular to dodecagonal shape is suitable for a charging chute having a polygonal cross section.

FIG. 5 is a diagram showing the result of calculating the relationship between the aspect ratio of the charging chute and the degree of dispersion by the simulation of the particle element method. According to FIG. 5, the degree of dispersion is 4.0. This is the case when the aspect ratio is 1.8 or less.
From the above, it can be said that a range having an aspect of 1.8 or less is a suitable range.

Next, a second embodiment of the present invention will be described with reference to FIG.
The charging chute 30 according to the second embodiment has a cylindrical shape in which a supply port 31 and a discharge port 32 are formed, and a circulation suppression rib (projection) 34 that extends inward in the flow path in the flow path 33. For example, three are formed in the extending direction of the flow path 33. Further, the charging chute 30 is a cylindrical portion over the entire length including the tip side.
According to the charging chute 30, the circulation suppression rib 34 is formed in the flow path 33, so that the circulation of the raw fuel is efficiently suppressed.

  For example, the rotation suppressing rib 34 is preferably formed in the entire range of the fluid contact surface. For example, when viewed from the direction in which the flow path 33 extends, the rotation suppression rib 34 has an inner angle of 30 ° to 90 ° with respect to the axis (the center of the flow trajectory when the raw fuel circulates or flows in the cylindrical portion). It is preferable that

Next, a third embodiment of the present invention will be described with reference to FIG.
The charging chute 40 according to the third embodiment has a cylindrical shape in which a supply port 41 and a discharge port 42 are formed, and a circulation suppression stone box (concave) 45 that is recessed in the flow channel outer side in the flow channel 43 is provided. For example, three are formed in the extending direction of the flow path 43. Further, the charging chute 40 is a cylindrical portion over the entire length including the tip side.
According to the charging chute 40, since the circulation suppression stone box 45 is formed in the flow path 43, a part of the raw fuel becomes the staying raw fuel 46 in the stone box 45, and the flowing raw fuel and the large friction resistance Therefore, the circulation of the raw fuel is efficiently suppressed.
In addition, in FIG. 7, although the case where the three rotation suppression stone boxes 45 were formed was demonstrated, it is suitable that the rotation suppression stone box 45 is formed in the whole range of a fluid contact surface, for example. . Moreover, it is suitable for the rotation suppression stone box 45 that the internal angle with respect to an axis | shaft is 30 degrees-90 degrees seeing from the direction where the flow path 43 extends, for example.

Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.
For example, although the case where the flow path 13 of the charging chute 10 is formed in a regular octagon has been described in the above embodiment, for example, the circulatory suppression shape portion constituting the flow path 13 needs to be a regular polygon. If the contact surface that contacts when the raw fuel flows (including the planned contact portion based on the flow amount of raw fuel, the notch angle, etc.) is composed of a set of straight lines, it is not a polygon. You may comprise by the collection of the straight line which consists of a one part side of a polygon.

  Moreover, in the said embodiment, although the case where the charging chute 10, 30, 40 was formed cylindrically over the full length was demonstrated, it is set as the structure by which the part of the length direction of the charging chute was open | released. In addition, an arc shape other than a straight line may be formed in addition to the contact surface with which the raw fuel comes into contact.

Moreover, in the said embodiment, although the case where the rotation suppression shape part was formed over the charging chute 10, 30, 40 which comprises a cylindrical part was demonstrated, the rotation suppression shape part of a cylindrical part is demonstrated. It is good also as a structure formed in a part by the side of the discharge ports 12, 32, 42.
Moreover, when a cylindrical part is formed in the front end side, parts other than the cylindrical part by which a part of flow path was open | released may be formed in the front end side rather than the cylindrical part.

  According to the charging chute and the charging device according to the present invention, when the raw fuel is charged into the blast furnace, it is possible to prevent the raw fuel from overflowing from the charging chute and being dispersed in the blast furnace. Industrially available.

O vertical axis 1 blast furnace 3 charging device 10, 30, 40 charging chute 13, 33, 43 flow path 15 octagon (circularity suppression shape portion)
34 Circumference suppression rib (projection)
45 Stone box (concave)

Claims (5)

A flow path is provided at the top of the blast furnace to supply raw fuel into the blast furnace, and the raw fuel is supplied into the blast furnace while being rotated around the axis while the flow path is inclined with respect to the axis extending in the vertical direction. A charging chute for charging,
A cylindrical portion is formed on the distal end side, and in the cylindrical portion, a circulation suppressing means for suppressing the raw fuel from circulating in the cylindrical portion is formed,
The rounding suppression means is
It is provided on the inner periphery of the cylindrical part, and includes a rotation suppressing shape part constituted by a polygon or a part of a polygonal side, and at least a contact surface when the raw fuel flows in the flow path, A charging chute characterized in that it is formed within the range of the rotation suppressing shape portion . The charging chute according to claim 1 ,
A charging chute characterized in that the circulatory suppression shape portion is constituted by a quadrangular shape to a dodecagonal shape. A flow path is provided at the top of the blast furnace to supply raw fuel into the blast furnace, and the raw fuel is supplied into the blast furnace while being rotated around the axis while the flow path is inclined with respect to the axis extending in the vertical direction. A charging chute for charging,
A cylindrical portion is formed on the distal end side, and in the cylindrical portion, a circulation suppressing means for suppressing the raw fuel from circulating in the cylindrical portion is formed,
The rounding suppression means is
A charging chute characterized in that the charging chute is a recess formed in an inner circumference of the cylindrical part and extending in the direction in which the cylindrical part extends. The charging chute according to any one of claims 1 to 3 ,
The charging chute characterized in that an aspect ratio (L1 / L2) defined by a ratio of the maximum length L1 and the minimum length L2 on the inner peripheral side of the cross section of the cylindrical portion is 1.8 or less. A charging device comprising the charging chute according to any one of claims 1 to 4 .

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