KR101326052B1 - Charging apparatus for raw material and the method thereof - Google Patents

Abstract

The present invention relates to a device and a method for supplying raw materials. The device comprises a raw material supply unit supplying the raw materials and a supply chute transferring the raw materials supplied from the raw material supply unit to a storage unit. A raw material transfer path of the supply chute is formed in a prolate cycloid curved shape. The present invention is capable of improving the quality and productivity of sintered ore by improving the permeability of the raw materials.

Description

Charging apparatus for raw material and the method

The present invention relates to a charging apparatus and a charging method of the raw material, and more particularly to a charging apparatus and a charging method of the raw material that can improve the air permeability of the raw material.

In general, in the sinter plant, the sintered raw materials are charged into the sintering trolley of the sintering machine using a charging device to manufacture the sintered ore. 1 shows a typical sintered raw material charging device. The sintering raw material charging device includes a sintering raw material hopper (2) in which a sintering raw material (1) containing fine powders such as fine iron ore and limestone and fine powder coke is stored, and the sintered raw material hopper of the sintering raw material hopper (4). And a chute 10 for charging the supplied sintered raw material onto the sintered trolley 8 first on the bottom light which is first placed on the sintered bogie 8. The chute 10 is composed of the inclined plate 11 serves to classify the sintered raw material so that small particles at the top of the sintered cart 8 and large particles at the bottom thereof are charged (vertical segregation). When the sintering raw material 1 is charged into the sintering bogie 8, the surface of the sintering raw material is evenly made by the surface of the flat plate 6, and then ignited in the ignition furnace 7 and sucked downward in the wind by the suction blower (not shown). The sintering reaction is performed by combustion of coke contained in the sintered raw material by air to produce a sintered ore.

In such a sintering operation, it is necessary to artificially encourage the coke, which is a fuel, to have a large amount of coke as fuel at the upper part so that the charged state of the raw material in the sintered trolley is placed at the lower part and the small particle at the upper part (vertical segregation bath). When the vertical segregation is effectively promoted, the calorific imbalance in the up-down direction of the sintering machine is suppressed, while the productivity (sintering resistance) of the air flowing into the raw material layer in the sintering machine is lowered to improve the sintered ore productivity. In this case, it is well known that it is best to keep the loading density of the raw material evenly in the width direction of the sintering machine if possible.

However, there is a problem that the loading density of the raw material, that is, the segregation degree is lowered due to various variables such as adhesion light is generated on the chute or the raw material accumulated in the sintered trolley collapses during the actual operation, there is a problem that the breathability. As a result, there is a problem in that the quality and productivity of the sintered ore decreases.

JP 1980-2716 A KR 411280 B

The present invention provides a charging apparatus and charging method of the raw material that can improve the degree of segregation of the charged raw material to improve the breathability.

The present invention provides a charging device and a charging method of the raw material that can improve the quality and productivity of the sintered ore.

A charging device and a charging method of a raw material according to an embodiment of the present invention are raw material charging devices including a raw material supply unit for supplying raw materials and a charging chute for transporting the raw material supplied from the raw material supply unit to a storage device. Is characterized in that the feed path of the raw material is formed in the curved surface of the prolate cycloid curve.

The charging chute may have an incident angle formed by a portion in which the raw material flows in a vertical direction and smaller than an escape angle formed by a portion in which the raw material flows in a horizontal direction.

The charging chute may be formed of a plurality of rollers or inclined plates.

The charging method of the sintered raw material which concerns on embodiment of this invention is a charging method of a raw material, Comprising: Preparing a raw material; Supplying the raw material to a charging chute in the form of a prolate cycloid curve; And transferring the raw material supplied to the charging chute into a path of a cycloid curve form and charging the raw material into a reservoir.

In the process of charging the reservoir, the raw material may have a horizontal release speed that is greater than the vertical release speed and may leave the charging chute.

In the process of charging the reservoir, the surface of the raw material layer of the charging chute may form a track in a cycloid curve shape.

The reservoir may move in a direction opposite to a direction in which the raw material leaves the charging chute.

In the process of charging to the reservoir, the raw material is preferably loaded with particles having a high density or size.

The charging device and charging method of the sintered raw material according to the embodiment of the present invention can increase the horizontal release speed of the raw material having various densities and sizes leaving the charging chute. Thereby, segregation degree of the raw material charged in the moving sintering trolley | bogie can be improved. In addition, since the segregation degree of the raw material is improved, it is possible to improve the air permeability in the raw material layer to improve the quality and productivity of the sintered ore produced. Moreover, there is also an effect which can improve the segregation degree of a sintering raw material, without changing a facility largely.

1 is a view schematically showing a typical sintering raw material charging device.
2 and 3 are views for explaining the operating principle of the raw material charging device according to an embodiment of the present invention.
4 is a view showing a raw material charging apparatus according to an embodiment of the present invention.
5 is a view showing a charging chute of the raw material charging device according to an embodiment of the present invention.
6 is a view for comparing the horizontal deviation speed along the path.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know.

The present invention relates to a charging device for charging a raw material containing particles of various densities and sizes to a moving reservoir, and may be applied to separate and load the raw materials by density and size of particles in the reservoir. In this way, the raw material charged into the reservoir can improve the air permeability by forming a space between the raw material particles. Hereinafter, a charging device for sintering raw materials and a charging method for charging the sintering blending raw materials used to manufacture the sintered ore used in the iron making process will be described as an example.

2 and 3 are views for explaining the operating principle of the raw material charging device according to an embodiment of the present invention.

The degree of segregation of raw materials in the raw material layer in the reservoir is based on the principle of powder segregation. Fig. 2 is a graph for explaining the principle of powder segregation, in which particles of raw material discharged from the inclined chute are separated from the inclined plane at a speed of V and have a θ angle component. In general, according to the well-known William's trajectory effect, as shown in Equation 1 below, the horizontal fall distance (L) of the powder is the horizontal release velocity (V _Eh ) and the density (ρ) and size of the particles It is proportional to the square of (a).

That is, the larger the density and diameter of the particles, the larger the horizontal release rate (V _Eh ), the greater the drop distance, and the larger the horizontal release rate (V _Eh ) for particles having the same density (ρ) and diameter (a), the raw material. The layers are stacked at the bottom. ("Μ" here means the viscosity of the air in which the particles of the raw material is present)) The higher the segregation, the more space there is between the particles, so that the air permeability can be improved, that is, having different density and diameter When the particles are mixed with each other and laminated, for example, small diameter particles are mixed between the large diameter particles, and the space is lost between the particles, resulting in low air permeability.

It can also be seen that increasing the horizontal velocity component of particles falling off at the end of the charging chute is effective for segregation charging. Here, the horizontal velocity of the particles leaving the charging chute represents dispersion by the momentum difference of the particles, and is directly related to segregation charging, and the vertical velocity represents pressure applied to the raw material layer, and is related to the charging density.

Thus, in order to effectively segregate the raw materials, it is necessary to increase the horizontal velocity of the falling particles. Of course, as the width and height of the charging chute increase, the horizontal speed can be increased, but the size of the equipment needs to be increased, so it is not feasible in terms of manufacturing, control and economics.

Therefore, in the present invention, when the sintered blended raw material leaves the charging chute, the horizontal chute speed of the raw material located on the surface of the charging chute, that is, the lowermost part of the raw material layer, is maximized, and at the same time, considering the height of the raw material layer on the charging chute, the charging chute By increasing the slope chute escape rate (escape) of the relatively large particles protruding on the surface of the raw material layer by the slope classification action to improve the segregation charging effect to the sintered bogie. Accordingly, the air permeability of the raw material can be improved to improve the quality and productivity of the sintered ore.

The charging device for the sintered raw material according to an embodiment of the present invention comprises a charging chute configured to have a curved surface in the form of a prolate cycloid curve in forming a charging chute for introducing various blended raw materials into a sintering cart. The horizontal release rate of the sintered blended raw material can be increased by allowing the surface of the raw material layer that travels along the movement path, i.e., the top layer, to flow while forming a cycloid curve trajectory known as the shortest falling curve.

The prolate cycloid curve is located outside when concentric circles with two different radii (r, r _P ) as shown in FIG. It means the trajectory drawn by the vertex P on the circumference of a large circle (circle whose radius is r _P ) to be expressed by the following equations (2) and (3).

(Where r is the radius of the small circle, t is the difference between the radius of the large circle and the small circle (r _P -r)

The length of the charging chute (d), the angle of incidence (ф _PS ) at the position (P) at which the sinter blending raw materials are discharged from the drum feeder to the charging chute, the thickness (t) of the raw material fluidized bed on the charging chute, and the sintering blending raw materials If the charging chute exit angle ф _E at the position E is separated from the fixed position _E , the radius of the circle r _P and the blending raw material are introduced into the charging chute from the drum feeder using Equations 4 and 5 ( The height h _{P of P} ) can be derived.

The release rate (V _PE ), the horizontal release rate (V _PEh ) and the vertical release rate (V _PEv ) of the raw material at the bottom of the raw material fluidized bed (surface of the charging chute) at the point where the raw material leaves (E) are _expressed by the following mathematical _equation . It can be represented by the formulas 6 and 7.

The charging chute has a path following the curves shown in Equations 2 and 3, and the raw material discharged from the charging chute surface has the length (d), height (h), angle of incidence (ф _PS ), The maximum horizontal velocity is obtained with respect to the escape angle ф _E.

When the oblique trajectory of the charging chute has a prolate cycloidal shape, the curve trajectory of the raw material particles at the top (surface) of the raw material fluidized bed considering the fluidized bed thickness t of the sintered blended raw material has a general cycloidal curve equation.

As shown in FIG. 3, the cycloid curve means a trajectory of a vertex on a circumference when a circle (small circle) having a radius r is rolled along a straight line on a plane, as shown in Equations 8 and 9 below. Is expressed. In this case, the cycloid curve may appear to be formed in a shape similar to the prolate cycloid curve, but the distance (t, the same as the thickness of the raw material layer) between both curves increases toward the position E where the raw material leaves the charging chute. It can be seen that.

(r is the radius of the circle, θ is the angle the rotation of the circle)

Here, if the charge chute exit angle ф _E at the position E where the raw material is separated from the charge chute in the state where the length d of the charge chute and the height h of the charge chute is determined, the radius of the circle ( r) and the height (h) of the position (P) at which the raw material is fed from the drum feeder to the charging chute, and the angle of incidence (ф _S ) at the position (P) at which the raw material is discharged from the drum feeder to the charging chute is derived. can do. The incidence angle is an angle formed by the charging chute with a straight line in the vertical direction, the angle of the upper side of the charging chute supplied with the raw material from the drum feeder, and the escape angle is an angle formed by the charging chute with a straight line in the horizontal direction, and the raw material is discharged to the sintering cart. Is the lower side angle of the charging chute.

The release rate V _E , the horizontal release rate V _Eh , and the vertical release rate V _Ev of the sintered blended raw material at the point E at which the raw material leaves the charging chute are represented by Equations 12 and 13 below. Can be.

(g is gravity acceleration)

The charging chute has a path of the prolate cycloid curve following the curves shown in equations (2) and (3), and the raw particles at the surface of the raw material layer flow with the path of the cycloid curve. In this case, the particles have a maximum horizontal velocity with respect to the length d, the height h, the incident angle ф _PS , and the escape angle ф _E of a predetermined charging chute.

4 is a view showing a sintering raw material charging apparatus according to an embodiment of the present invention, Figure 5 is a view showing a charging chute of the sintering raw material charging apparatus according to an embodiment of the present invention.

The sintered raw material charging device includes a raw material supply unit including a raw material hopper and a drum feeder, and a charging chute.

The sintered raw material charging device includes a raw material supply unit including a raw material hopper 100 and a drum feeder 120, and a charging chute 130.

The raw material hopper 100 supplies the blending raw material 1 such as fine iron ore, subsidiary materials and fine coke to the drum feeder 120 via the hopper gate 110, and the drum feeder 120 is rotated and fed into the blending material. The raw material 1 is mixed and sent out to the charging chute 130.

The charging chute 130 forms a sloped surface and serves to classify the raw material 1 so that the small particles at the top of the sintered trolley 200 and the large particles at the bottom thereof are charged (vertical segregation). When the raw material is charged to the sintered trolley 8, the surface of the raw material is evenly made by the surface of the flat plate 140 to ignite in the ignition furnace 150, and the raw material by the air sucked downward in the wind by the suction blower (not shown) ( Sintering reaction is performed by the combustion of coke contained in 1), and a sintered ore is manufactured.

The charging chute 130 may be formed by arranging the plurality of rollers 132 side by side, or may be formed of an integrated inclined plate (not shown). The charging chute 130 has a conveying path formed into a curved surface having an area, and the cross-sectional shape of the charging chute 130 has a form of a prolate cycloid curve as shown in Equation 2 above. In addition, the lateral cross-sectional shape of the surface of the raw material layer moving on the charging chute 130 has a trajectory in the form of a cycloid curve as shown in Equations 8 and 9. Subsequently, the raw material particles on the surface of the raw material layer leaving the charging chute 130 may have a length d, a height h, an incident angle ф _PS , and an escape of the charging chute 130 determined to form a curved path of the charging chute. For the angle ф _{E it} has the maximum horizontal release velocity V _Eh .

6 is a diagram for comparing the horizontal deviation speed along the path.

Figure 6 (a) shows the loading chute departure rate of the raw material in the charging chute having a straight slope. In the case of the charging chute having a straight inclined surface, when the length d and the height h of the charging chute are determined, the inclination angle ф of the charging chute is determined.

Figure 6 (b) shows the charge chute departure rate of the raw material particles on the surface of the raw material layer in the charging chute having an inclined surface in the form of a prolate cycloid curved surface according to the present invention. Here, the transfer path of the charging chute is determined by the change of the length (d), the height (h) of the charging chute, the incident angle (ф _PS ) and the escape angle of the raw material, and the speed at which the raw material leaves the charging chute (V _PE , V _E ) is determined by equations (6) and (12).

Comparing Fig. 6 (a) and (b), when the length (d) and height (h) of the charging chute is the same, when the transfer chute of the charging chute is a prolate cycloid curved surface, when the charging chute is straight It can be seen that the horizontal release rate V _Eh is increased and the vertical release rate V _Ev is decreased. In addition, it can be seen that when the transfer path of the charging chute is in the form of a prolate cycloid curved surface, the separation speed V _PE at the charging chute surface and the separation speed V _E at the raw material layer surface are almost the same.

For accurate comparison, when the length of the charging chute (d) is fixed to 1m and the height (h) is changed to 0.8m, 1.0m, and 1.2m, the raw material exit horizontal velocity (V _PEh ) and each variable for each charging chute are _adjusted . It is summarized in Table 1 below. Here, Examples 1 to 6 show the case of the cycloid curved charging chute, Comparative Examples 1 to 3 show the case of the straight chute chute, and the interaction caused by the disturbance caused by the formation of the adhesion light and the layer flow of the particles Did not consider

t (mm) d / h (m) Φ (°) Φ _PS / Φ _S (°) Φ _E (°) V _PEh / V _Eh (m / s) Example 1 10 1.0 / 0.8 42.4 / 41.9 30 3.43 / 3.43 Example 2 10 1.0 / 1.0 32.5 / 26.5 30 3.7 / 3.84 Example 3 10 1.0 / 1.2 9.4 / 6.8 30 4.2 / 4.2 Example 4 50 1.0 / 0.8 44.3 / 41.9 30 3.43 / 3.43 Example 5 50 1.0 / 1.0 30 / 26.5 30 3.84 / 3.84 Example 6 50 1.0 / 1.2 15.7 / 6.8 30 4.2 / 4.2 Comparative Example 1 1.0 / 0.8 38.7 3.07 Comparative Example 2 1.0 / 1.0 45 3.11 Comparative Example 3 1.0 / 1.2 50.2 3.08

According to Table 1, when the length and height of the charging chute are the same, the horizontal release speed (V _PEh ) in Examples 1 to 6 compared to the horizontal release rates (V _PEh , V _Eh ) in Comparative Examples 1 to 3 It can be seen that the increase. For example, when comparing Example 1 and Comparative Example 1, in Example 1, the horizontal release speeds V _PEh and V _Eh are 3.43 / 3.43 m / s, whereas in Comparative Example 1, the horizontal release speed V _Eh is 3.07 m / s. It can be seen that, in Example 1, the horizontal release speeds V _PEh and V _Eh increased by about 11.73% compared with Comparative Example 1. In addition, as a whole, the horizontal escape rates (V _PEh , V _Eh ) was found to increase by about 12 to 36% compared to each d / h in the case of the charged chute of the _prolate cycloid curved form.

When the horizontal separation speed of the raw material increases, the fall distance is increased by Equation 1 when the density ρ and the size a are constant.

In addition, since the raw material particles have substantially the same horizontal separation rate from the surface of the charging chute and the surface of the raw material layer, when the slope is generated in the raw material layer, the particles having the larger size of the particles move to the upper part of the raw material layer. Therefore, when the horizontal departure rate is constant, the segregation degree is improved by increasing the drop distance of the raw material having a large density (ρ) and size (a), that is, relatively large particles present near the surface of the raw material layer flowing through the charging chute. Can be.

In addition, while charging the raw material into the sintered trolley, the sintered trolley moves in a direction opposite to the direction in which the raw material leaves. At this time, the falling distance of the raw material having a high density and size is increased, and the raw material having a high density and size is stacked on the sintered trolley, and then the raw material having a low density and size is stacked on the upper portion thereof. Therefore, the segregation degree in the sintered blended raw material layer in the sintered trolley increases to increase the air permeability, thereby greatly increasing the productivity of the sintered ore.

Although the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be defined by the appended claims and equivalents thereof.

1: raw material 100: raw material hopper
110: hopper gate 120: drum feeder
130: charging chute 140: surface plate
150: ignition furnace 200: sintered trolley

Claims (8)

A raw material charging apparatus comprising a raw material supply unit for supplying a raw material and a charging chute for transferring the raw material supplied from the raw material supply unit to a reservoir,
The charging chute is a charging device of the raw material is the feed path of the raw material is formed into a curved surface of the prolate cycloid curve. The method according to claim 1,
And an incidence angle formed by the portion in which the raw material is introduced into the vertical direction in the charging chute is smaller than an escape angle formed by the portion in which the raw material is discharged into the horizontal direction. The method according to claim 1,
The charging chute is a charging device of the raw material is formed of a plurality of rollers or inclined plate. As a charging method of raw materials,
Preparing a raw material;
Supplying the raw material to a charging chute in the form of a prolate cycloid curve; And
Transferring the raw material supplied to the charging chute into a path of a cycloid curve shape and charging it into a reservoir;
Charging method of a raw material comprising a. The method of claim 4,
The charging method of the raw material is released from the charging chute in the process of charging the raw material has a horizontal release rate greater than the vertical release rate. The method of claim 4,
The charging method of the raw material to the surface of the raw material layer surface of the charging chute in the process of charging to the reservoir to form a track of the cycloid curve. The method according to any one of claims 4 to 6,
And the reservoir moves in a direction opposite to a direction in which the raw material leaves the charging chute. The method of claim 7,
The charging method of the raw material is charged from the particles having a large density or size in the process of charging in the reservoir.

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