KR19990080981A - Raw material charging method of sintering machine and its device - Google Patents

Abstract

The present invention is to determine the particle size and the content of the solid fuel in the height direction of the raw material layer which is charged into the sintering machine during the manufacturing process of the sintered ore which is agglomerated (lumped) by mixing the iron ore in the powder state for use as steelmaking raw materials The present invention relates to a raw material charging method and apparatus for sintering machine which induce distribution in segregation state and control segregation degree.

In other words, in the discharge of the raw material for sintering from the storage tank to be segregated on the sintering machine trolley through the sliding rod, at least two pairs of twin rods are installed so that they can be rotated in a circumscribed state. At the same time, the bicyclic rods are rotated individually, and at the same time, the bicyclic rods are displaced at desired angles from the inclined surface of the sliding table, and a two-stage detection rod is installed on one side of the bogie to detect the amount of compounding material charged into the fine grain. As a result, the segregation distribution of the charging of the sintered raw material is controlled and the segregation degree is controlled.

Description

Raw material charging method of sintering machine and its device

The present invention relates to a method for charging a raw material of a sintering machine and a device thereof, and more particularly, a raw material charged into a sintering machine in the manufacture of a sintered ore in which powder ore is mixed and agglomerated for use as a steelmaking raw material. The present invention relates to a raw material charging method and apparatus for sintering machine which induce distribution of particle size and solid fuel content in the segregation state in the height direction of the layer and control the segregation degree.

In general, the particle size of the iron ore used as the sintering raw material is about 8mm or less, and various subsidiary materials and solid coke and anthracite are mixed as fuel and charged in the sintering machine.

The raw material charging device provided in the conventional sintering machine, as shown in Figure 1, the storage tank (1) located in the upper portion of the sintering machine for storing the raw material, and the drum installed in the lower portion of the storage tank rotated by a separate motor The feeder (2) and the plate-shaped gate (3) attached to the drum feeder can be adjusted to adjust the rotational speed of the drum feeder (2) and the distance between the gate (3) in the storage tank (1) The discharge amount of the blended raw material was controlled, and the discharged blended raw material is moved downward along the inclined plate 4 and the slit bar 5, which is a dispersion device, and charged into the trolley 6 of the sintering machine.

The blended raw material charged in the trolley is a solid fuel mixed in the blended raw material is burned from the upper layer to the lower layer by air ignited from the surface and sucked downward, and the secondary raw material and iron ore are partially dissolved by the heat of combustion of the solid fuel generated at this time. As a result of the necrosis.

In the downward suction sintering method, since the heat of the upper portion is transferred to the lower portion, when the particle size of the blended material and the distribution of the solid fuel content are uniform, the upper layer lacks heat due to the inflow of cold air, while the lower layer measures heat generated from the upper layer. This results in excess calories.

As a result, the surface layer and the upper layer are incompletely determined to determine the sintered state, and thus the strength of the sintered ore is lowered and the recovery rate is lowered. It was.

In order to solve this problem, the method of inducing segregation according to the particle size is carried out by paying attention to the fact that the content of solid fuel is high in the finely divided raw material, and the fine raw material is charged in the upper part of the raw material loading layer, and the granulated raw material is charged in the lower part. This was introduced.

As the most common technique using the conventional segregation charging method, the segregation effect could be expected to a certain degree even with a simple inclination plate charging device, but in this case, the larger the sintering machine with a large feed rate of raw materials, the greater the amount of raw material that moves the inclined plate, thus the assembly and finer As a result, the segregation capacity of the furnace was significantly reduced, and the segregation degree was insufficient due to the wave collapse of the raw material deposit of the bogie located directly below the raw material charging device.

In order to solve the above problems, various charging methods for dispersing raw materials have been proposed, and typical charging methods are slit bar type chutes, grain dispersion equations (ISF), and two-stage loading. Legislation.

The charging method using the slit bar type chute (Japanese Patent Laid-Open No. 89-104724) is to allow the raw material supplied from the drum feeder to be charged while being separated up and down in a slit part consisting of a transverse rod of about 10 mm in diameter, and having large particles. The raw material aims at the stochastic classification effect that it is difficult to fall into the lower part of the slit.

However, before the sintered raw material is introduced into the storage tank of the sintering machine, a pseudo-granulation treatment is performed in which fine powder is attached to the granulated raw material by adding an appropriate amount of water while mixing various sub-raw materials and solid fuels to the iron ore, and passing the charging device. The sintered raw material at has a very large adhesion, and accordingly, since the sintered raw material (C) is strongly attached to the lateral bar 5 ', there are many limitations in controlling segregation through the slit bar type chute (see FIG. 2A). ).

In order to compensate for this disadvantage, there was a method of rotating the horizontal bar (5 '), the problem that the adhesion is growing fine particles attached to the horizontal bar is not solved.

In addition, the vibrating device to vibrate the lateral bar was effective in removing the attachment raw material, but there was a side effect that the crack is applied to the charging device due to the vibration, and the vibration device can be operated by setting a certain period In this case, segregation and loading density change in the longitudinal direction of the sintering machine truck due to repeated attachment and dropping of the sintered raw material on the side bar according to the set cycle, which makes it impossible to operate uniformly in time series and cause noise pollution from the vibration device. do.

On the other hand, in order to improve the problems of the slit bar chute charging device developed by New Nippon Steel, several bars are arranged in parallel with the flow direction of the raw material. As the middle and lower stages are installed in three stages, and the inclination of each stage is increased so that the interval between the bars is continuously increased from the upper part to the lower part, the fine particles drop at the upper part and the raw material having larger particles drop at the lower part and continuously. Segregation was achieved, and a plurality of bars were rotated in a predetermined direction in order to overcome the phenomenon of fine powder adhering to the bar and sandwiching of granulated raw material between the bars.

However, the device is very complicated in structure and expensive to manufacture and maintain, as well as abrasion or warpage of the rotating bar, and when any one of the dozens of bars constituting the device is in an abnormal state, it causes uneven charging. Therefore, it was difficult to check the condition of the charging device or to maintain and maintain it.

The two-stage charging method of the prior art is to control the raw material particle segregation degree between the upper and lower layers by dualizing the transport, storage and charging control system of the raw materials, and has the advantage of arbitrarily adjusting the mixing ratio of iron ore and subsidiary materials in the upper and lower layers. The method has the disadvantage that it is impossible to secure optimal segregation in the depth (vertical) direction of the charged raw material due to heavy equipment investment cost and complicated operation, and the segregation of the charged raw material is discontinuously changed based on the upper and lower boundary. There is this.

On the other hand, the slit slant plate charging method developed by Pohang Steel (Publication No. 92-21484) makes a slit by arranging a plurality of relay slant plates and round bars at appropriate intervals in the transverse direction to make slits with the raw material of fine grains missing between the slits. By classifying into fine grains, it was possible to maintain the segregation level similar to that of the slit bar chute charging device, but it was not possible to solve the problem that the segregation control of the charging raw material was difficult due to the attachment of fine powder, which is a disadvantage of the slit bar chute charging device. It was.

In conclusion, various conventional charge induction and dispersing apparatuses for increasing segregation rate through sintering charging apparatus are used to increase the precision according to segregation control of raw materials due to the strong adhesion of sintered raw materials and the adhesion of fine powders. There is a limit to the development of various devices to remove the adhering light is difficult to secure durability due to the large load load caused by a large amount of sintered raw material and wear resistance.

The present invention has been made in view of the various problems caused by the charging of the conventional sintered raw materials as described above, the object of each of the multi-stage bicyclic rods installed so as to be rotatable in a mutually circumscribed state by at least two pairs It is to provide a raw material charging method and apparatus of the sintering machine that can be rotated in the direction to prevent the phenomenon that the fine raw material is attached to the round bar.

Another object of the present invention is to adjust the angle of the sintering raw material sliding surface and each pair of round rods provided in the charging device to load the raw material of the sintering machine which can freely control the classification ratio of the large and small raw materials according to the required degree of segregation A method and apparatus are provided.

In order to achieve the above object, the present invention discharges the blended raw material for sintering from the storage tank and loads segregated on the sintering machine bogie through the slide table, so that at least two pairs can be rotated in a circumscribed state. Install bicyclic rods of each, and make each bicyclic rod rotated separately, and at the same time, the bicyclic rods are displaced at desired angles on the slope of the slide table, and the amount of compounded raw materials charged and classified into fine grains on one side of the trolley. By installing a two-stage detection rod to detect, it is characterized in that the loading of the sintered raw material is segregated and the segregation degree is controlled.

1 is a side configuration diagram showing a charging device of a sintering machine using a conventional slit bar type chute,

Figure 2a is an exemplary view of the state that is attached to the spectroscopic slit bar chute,

Figure 2b is a cross-sectional configuration diagram showing the distribution state of the blended raw material charged to the sintering machine bogie when attached to the slit bar type spectroscopic;

Figure 3 is a schematic view showing a raw material charging device of an embodiment of the present invention,

Figure 4 is a block diagram extracting the bicyclic rod rotating apparatus of the embodiment,

Figure 5 is a schematic view of the biannual rod mounting angle adjusting device of the embodiment;

Figure 6 is a side configuration view showing a charging state of the raw material charging device of the present invention,

Figure 7a and 7b is an illustration of the classification and rotation state of the blended raw material according to the mounting angle of the bicyclic rod provided in the charging device,

8 is a flowchart illustrating a step-by-step control method for the segregation amount of the raw material of the embodiment of the present invention.

<Explanation of Signs of Major Parts of Drawings>

10: reservoir 11: drum feeder

12: inclined plate 13: auxiliary chute

20: Balance 30: bicyclic bar

40: drive device 41: chain gear

42: chain 43, 72: motor

44: guide roll 50: bearing block

51: bearing 60: control frame

61: protrusion 70: wire rope

71: hoist chain 80: cut off plate

90: detection sensor 91, 92: bar

C… Sintered Raw Material

Hereinafter, the raw material charging method and the apparatus of the sintering machine of the present invention will be described in detail based on the accompanying drawings.

FIG. 3 is a schematic configuration diagram of a raw material charging device according to an embodiment of the present invention, and is discharged by driving the drum feeder 11 from the storage tank 10 in which the sintered raw material C is stored and moved through the inclined plate 12. The auxiliary chute 13 is installed to be inclined on the passage distributed in 20, and the multi-stage bicyclic bar 30 is rotatable in a state in which the auxiliary chute 13 is inclined at least two in pairs on the inclined surface thereof. ) Is installed.

The diameter of the bicyclic rod 30 is less than about 10mm to 40mm and it is preferable to increase the lower side rod compared to the upper side rod sintered raw material (C).

Since the proper segregation of the sintered raw material is changed according to the properties of the sintered raw material and the operating conditions, the bicyclic bar spacing is appropriately set between 10 mm and 100 mm.

As the feed rate of some large sintering machines exceeds 1,000 tons per hour, bicyclic rods require high tensile strength.Because the feedstock is a mixture of iron ore and limestone, the bicyclic rods are severely worn when sliding. Corresponding wear resistance is also required.

Therefore, the material of bicyclic rods is made of special steel or special material rather than ordinary steel, and the bearing is used to rotate while absorbing the tensile stress due to the large load applied to the bicyclic rods at both ends.

Figure 4 is a schematic view of the bicyclic rod rotating device of the embodiment, both ends of the bicyclic rod 30 to be rotated individually to configure each rod constituting it, but each bicyclic rod 30 at the same time The drive device 40 is rotated so as to be rotated.

The drive device 40 is selected from one of the pair of bicyclic rods 30 and extends to both sides, respectively, attached to the end of the chain gear 41 and the chain gear 41 is installed in the motor 43 It is composed of a chain 42 for transmitting the rotational force while operating by the drive of, the upper and lower sides of the chain 42 is provided with a guide roll 44 for preventing the departure from the chain gear 41 while adjusting the tension thereof. .

That is, the chain gear 41 rotated by the chain 42 is connected to each one of the pair of upper or lower round rods of the pair of twin rods 30 are rotated, respectively, in this case the direction of rotation of the twin rods 30 To the opposite direction to the opposite side from the inner side of the outer surface to the outer side as the adhered light to the outer peripheral surface is removed to prevent the phenomenon of blending raw material sandwiched between the round bar.

The pair of bicyclic rods 30 to which the chain gear 41 is bonded is supported by a bearing block 50 to which the bearings 51 are coupled so as to rotate smoothly in a state in which they are externally circumscribed. It is provided in the control frame 60 which displaces the mounting angle, supporting 30.

5 is a schematic view of the biannual rod mounting angle adjusting device of the embodiment, the bearing block 50 is supported on both ends of the biannual rod 30 is fixed to the adjustment frame 60 is the angle by the rotation thereof It is installed to be displaced, a plurality of protrusions 61 are formed on the outer circumferential surface of the control frame 60 to face each other.

High-strength wire ropes 70 are connected by clips 62 to the end portions of the both side protrusions 61 so as to rotate the control frame 60 by a desired angle by a straight motion, and at both ends of the wire ropes 70. A certain section is formed by the hoist chain 71 so as to accurately transmit rotation of the motor 72.

6 is a side configuration diagram showing a charging state of the raw material charging device of the present invention, a cut-off plate 80 for adjusting the height of the charging layer while flattening the surface layer portion of the charging material on the lower rear surface of the bicyclic rod 30. The front face of this cut-off plate 80 is provided with the detection sensor 90 which consists of at least 2 steps of the bars 91 and 92 of a long length and short so that the amount of the loading raw material of the fine grain piled up is measured.

The detection sensor 90 detects whether each of the rods 91 and 92 having different lengths is in contact with the compounding material loaded thereon and transmits the signal to the sintering machine control computer (not shown). The mounting angle of the bicyclic rod 30 is adjusted based on the value.

Figure 7a and 7b is an illustration of the classification and rotational state of the blended raw material according to the mounting angle of the bicyclic rod provided in the charging device, the biaxial rod 30 mounted perpendicular to the direction in which the sintered raw material is in close contact with each other By rotating the inside out with respect to the upper surface of the contact portion in the state, the ore attached to the bicyclic rod 30 is completely removed and the sintering raw material is prevented from being caught between the rods.

The rotational speed of the bicyclic rod 30 is preferably set to a low speed within 2 times per minute in consideration of the durability of the rotating device.

The reason is that the stagnant layer of the blended raw material is formed on the upper surface of the bicyclic rod 30 so that the sliding raw material does not come into direct contact with the bicyclic rod, thereby having superior durability than the conventional monolithic slit bar. When the rotational speed of (30) is fast, the stagnant layer is thinned and the sintered raw material and the bicyclic rod are in direct contact with each other, and the bicyclic rod is worn out prematurely. This is because the rotating part is worn out prematurely when rotating at high speed.

And increasing the rotational speed of the round bar located in the upper part of the pair of twin rods 30, the fine grain falling into the slit between the twin rods increases, so if the amount of segregation control is insufficient by the method of adjusting the mounting angle of the twin rods, the rotation speed of the twin rods Adjustment can be used as an aid to segregation control.

Mounting angle of the bicyclic rod 30 is a hoist chain 71 and a wire rope 70 connected to the hoist chain 71 is rotated by the driving of the motor 72, the control frame 60 fixed via the bearing block 50 at both ends thereof. As the control frame 60 is rotated by a desired angle by the straight motion of the), the mounting angle of the bicyclic rod 30 is displaced.

That is, as the mounting angle of the bicyclic rod 30 is increased to a certain angle, the amount classified into fine grains is reduced, and the mounting angle of the bicyclic rod 30 is parallel to the falling direction of the fine raw material falling between the slits (vertical to the ground). In this case, the amount classified into fine grains reaches the highest point, so the degree of segregation of granules and fine grains, that is, the segregation of sintered raw materials, can be freely controlled by adjusting the mounting angle of bicyclic rods according to the operating conditions of the sintering raw material and the sintering machine. do.

8 is a flowchart illustrating a step-by-step control method for the segregation amount of the charged raw material of the embodiment of the present invention, the rotation of the bicyclic rod 30 and the adjustment operation of the mounting angle of the sintering machine bogie 20 When the compounding material reaches the charging stage, the detection sensor 90 composed of at least two stages 91 and 92 of long and short lengths of the finely divided raw material of the cut-off plate 80 is continuously charged. The measurement is transferred to the sintering machine control computer.

That is, as a result of detecting whether the sensor attached to the end of the long rod 91 constituting the detection sensor 90 and the sensor attached to the end of the short rod 92 is loaded, the value of the charge amount is determined to obtain a value of the loaded compound. The long rod 91 of the raw material and the detection sensor 90 is always in contact with each other, but is installed by adjusting its position so that it is always separated from the single rod 92.

Therefore, the control computer judges that the amount of segregation is adjusted when the long rods 91 and the long rods 92 are both separated or in contact with the loaded compounding materials based on the measured values. It determines with the case where segregation amount is not adjusted.

In the two cases of adjusting the amount of segregation, if all of the rods of the detection sensor 90 do not come into contact with the loaded compounding material, it is determined whether the amount classified as fine granules can be increased by lowering the mounting angle of the bicyclic rod 30.

At this time, if the mounting angle of the bicyclic rod (the acute angle formed by the vertical plane and the biaxial rod with respect to the ground) is less than 1/2 of the sliding angle of the compounding material (the inclined surface of the charging device), the fine angle may be reduced even if the mounting angle of the bicyclic rod is reduced. Since the amount to be classified does not increase, when the bicyclic rod mounting angle is smaller than 1/2 (about 25 to 30 °) of the sliding angle of the raw material, it is determined that the bicyclic rod mounting angle is outside the control range and the cutoff plate 80 Choose how to adjust the height.

In addition, when both the bong and danbong are in contact with the loading surface of the fine-grained raw material, it is classified into fine grains. Therefore, the two detection rods are judged and controlled in the opposite manner to the case where both detection rods do not touch.

That is, when the mounting angle of the bicyclic rod 30 is greater than 90 ° (horizontal with the ground), even if the mounting angle is increased, the amount classified into fine grains does not increase. A method of adjusting the height of the cutoff plate 80 by selecting outside the control range is selected. When the angle is smaller than 90 °, the method of changing the bicyclic rod mounting angle is selected by determining that the bicyclic rod mounting angle is within the control range.

In the above, the method of changing the mounting angle of the bicyclic rod is to reduce the mounting angle when increasing the amount classified into fine grains in consideration of the characteristics of the charging device and operating conditions, and conversely, to increase the angle when reducing the amount classified into fine grains. Set the value to change once per mounting angle.

On the other hand, when the mounting angle of the bicyclic bar is outside the control range, the height of the cut-off plate is adjusted to classify fine grains to be appropriately adjusted.

In case of excessive stockpile, it is on the cut-off plate and vice versa.

As described above, the raw material charging method and the apparatus of the sintering machine according to the present invention, since the bicyclic rods installed on the sliding surface of the raw material are rotated in close contact with each other, it completely solves the problem of adhesion of finely divided raw materials and in the width direction as well as the longitudinal direction of the sintering machine bogie Also, the sintered raw material can be charged uniformly.

In addition, by adjusting the mounting angle of the twin-rod bar, the segregation amount can be freely controlled in the depth direction of the sintering machine trolley. Accordingly, the chute of the lower part of the dispersing device employed in the conventional slit bar chute and slit inclined plate charging device is removed. In addition, by installing a cut-off plate at the rear of the charging device, segregation can be improved and fundamentally solved the problem of adhesion light in the chute.

Therefore, it is possible not only to control the amount of charge uniformly in the width direction and the length direction of the sintering machine bogie, but also to automatically control the height of the cutoff plate so that the density of the charge material can be uniformly adjusted to the desired value. By controlling the particle size and segregation of solid fuel to an appropriate state, the air permeability of the sinter bed (loading material loading layer) can be improved and the heat quantity of the upper and lower layers can be adjusted appropriately, so that the productivity of the sinter, the quality and recovery rate of the sintered ore, There is an effect that can greatly improve the overall sintering process, such as raw units.

Claims (2)

The auxiliary chute on the feed path of the raw material to be discharged by the operation of the drum feeder 11 from the storage tank 10 in which the sintered raw material C is stored and to disperse the compounding raw material into the sintering machine trolley 20 through the inclined plate 12. (13) is provided inclined, At least two pairs of pairs on the inclined surface of the auxiliary chute 13 are installed in multiple stages and are rotated in a mutually circumscribed state, and chain gears are formed at both ends of each rod constituting the bicyclic rods 30. 41 is joined to the chain 42 which transmits the power of the motor 43 to rotate the bicyclic rod 30 individually, and a plurality of guide rolls on the outside thereof to prevent the chain 42 from being separated. A bearing block 50 having a drive device 40 having a 44 and a bearing 51 for smoothly rotating the pair of bicyclic rods 30 in a circumscribed state, and the bearing block 50. Installed on the outside of the) and connected to the control frame 60 for displacing the mounting angle while supporting the bicyclic bar 30, and a plurality of protrusions 61 formed to face each other on the outer circumferential surface of the control frame 60, respectively. The jaw moves straight through the hoist chain 71 which transmits the rotation of the motor 72. Wire rope 70 to be rotated by the required angle to the frame 60, and the amount of charge accumulated on the front of the cut-off plate 80 when the compounding material is charged to the sintering machine trolley 20 to measure the control computer A raw material charging device for a sintering machine, characterized in that it comprises a detection sensor (90) consisting of at least two stages (91) (92) of long and short lengths are installed to transmit. Preventing the sintering raw material from being caught between the bicyclic rods 30 while removing ore attached to the outer circumferential surface by the bicyclic rods 30 rotated in close contact with each other in a passage in which the sintering raw materials slide; As the control frame 60 is rotated by the linear movement of the wire rope 70 through which the driving force of the motor 70 is transmitted, the mounting angle of the bicyclic rod 30 is adjusted to sinter according to the operating conditions of the raw material and the sintering machine. Controlling the segregation rate of the raw material, and when the compounding material is loaded into the sintering machine trolley 20, the amount of charge is measured according to whether the detection sensor 90 is in contact, and the measured value is transmitted to the sintering machine control computer and measured accordingly. Raw material charging method of the sintering machine characterized in that it comprises the step of determining the presence or absence of the segregation control based on the calculated value.