JPH0961060A - Device for manufacturing sintered ore - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for manufacturing a sintered ore in which a magnetic floating force to be given to a sintered cake without being contacted to it is kept constant without changing a current value supplied to an electromagnet. SOLUTION: This device comprises a supporting plate 17 for supporting a super-conductive electromagnet 20, a strain gauge 18 for sensing a strain amount of the supporting plate 17 and a gap sensor 19 for sensing a gap between the surface of the sintered cake and a lower surface of the super- conductive electromagnet 20 in such a way that the sintered cake is magnetically retracted upon completion of sintering of a surface part of a raw material filled layer through ignition of it and at a subsequent location where the sintered cake is generated at the surface layer part. The detected strain amount and the gap amount are converted into each of magnetic floating forces, respectively, to calculate a deviation value in respect to the set value and then an ascending or descending of an ascending or descending device is controlled in such a direction as one to cause them to become zero.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention provides a magnetic levitation force to an upper sinter cake that has been fired to reduce a load applied to a lower layer when an iron ore sinter is produced by a self-combustion method. The present invention relates to a sinter production apparatus that secures ventilation holes and contributes to improvement in sinter productivity, quality, and the like.

[0002]

2. Description of the Related Art Conventionally, in the iron ore sintering method, after igniting the surface layer of a packed bed raw material containing powder coke, air is continuously sucked downward to continue combustion of the powder coke. The band moves downward with respect to the height direction of the pallet so that the combustion reaction proceeds. In such a downward suction type sintering method, it is necessary to secure the minimum necessary ventilation holes, but in the process of moving the combustion zone downward, in the lower layer of the sintering layer,
Although it is sintered by the air preheated by the sintering completion zone of the upper layer, the upper layer of the sintering layer has insufficient heat because there is no such situation. For this reason, the lower the layer is, the more the heat is excessive and the more it is sintered, so that the amount of the melt generated, which has the property of closing the pores, increases. Further, the upper layer sinter cake acts as a pressing lid and applies a load to the lower layer, so that it acts as a force for crushing the pores in the presence of the melt, and the lower the layer, the stronger the tendency is to close the pores.

Therefore, in general, the lower the layer, the more difficult it is to secure the ventilation conditions necessary for stable combustion of the coke, which causes a decrease in the combustion speed. Furthermore, non-uniform combustion (so-called burning unevenness) occurs and the yield is reduced, and the porosity is reduced and the reducibility is also reduced. Therefore, as an improvement measure of the lower suction type sintering method, a technique is known in which a magnetic field is applied to the sintered upper layer sintered cake to give a magnetic levitation force, and the sintering is advanced with the load applied to the lower layer reduced. . Now, in order to give a magnetic levitation force to the sinter cake, there are a method of magnetically adhering a magnetic material to the sinter cake and pulling it up, and a method of magnetic attraction without contact.

[0004]

However, in the magnetic deposition method, when considering the continuous production of sinter,
For example, in the case of considering a configuration in which the above sintering is sequentially performed on each of a plurality of pallets that are connected and rotated, it is indispensable to move the magnetic material in synchronization with each pallet and to pull it up, which is a large facility. There was a problem that became. Further, in the non-contact magnetic system, when a permanent magnet or an electromagnet of a room temperature conducting coil is used as the magnetic body, the magnetic attraction force tends to be unpredictable, and there is a problem that the magnetic levitation force is not sufficiently generated in the sinter cake. It was

Therefore, the inventors of the present invention considered using an electromagnet of a superconducting coil as a magnetic body in the non-contact magnetic attraction method, but expected that the following problems would occur.
The surface of the sintered layer has irregularities on the surface of the sinter cake at the position where the magnetic levitation force is to be applied due to disturbance in the charging of raw materials and uneven ignition, etc. As a result, the gap with the electromagnet differs depending on the location, so magnetic levitation There is a difference in power. In order to eliminate this, the gap and the like should be detected, and the current supplied to the electromagnet should be controlled according to the gap and the like so that the magnetic levitation force is kept constant. However, when the current value changes in the superconducting electromagnet, heat is generated in the coil at that time. Such heat generation is not preferable for a state in which the coil is cooled to a cryogenic temperature in order to make a transition to the superconducting state. Therefore, it is necessary to make the magnetic levitation force applied to the sinter cake constant by a method other than this. The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a magnetic levitation force to a sinter cake in a non-contact manner, which is constant without changing a current value supplied to an electromagnet. To provide a manufacturing apparatus.

[0006]

In order to solve the above-mentioned problems, in the invention as set forth in claim 1, a sinter for producing sinter ore is produced by sucking air downward to promote sinter. In the ore manufacturing device, the sintering of the surface layer part is completed by the ignition of the raw material packed bed, and the magnetic substance is supported so as to magnetically attract the sinter cake at the point after the sintering cake is generated on the surface layer part. A support member, a magnetic attraction force detection means for detecting the magnitude of the magnetic force of magnetic attraction of the sinter cake by the magnetic member, and an elevating means for elevating the support member in the vertical direction with respect to the sinter cake,
When the force is strong, the lifting means is raised,
And an elevating control means for lowering the elevating means when the force is weak. According to a second aspect of the invention, in the first aspect of the invention, the magnetic attraction force detecting means detects the amount of strain of the supporting member. According to a third aspect of the present invention, in the first aspect of the present invention, a gap detecting unit that detects a gap amount between the surface of the sinter cake and the lower surface of the magnetic body is provided, and the elevating unit includes: It is characterized in that the amount of gap detected is used together with the amount of strain when the elevating means is moved up and down. According to the invention described in claim 4, in the invention described in claim 1, the magnetic body is a superconducting electromagnet using a superconducting coil.

(Operation) According to the present invention, the magnetic body is supported by the support member to magnetically attract the sinter cake.
At this time, the magnetic attraction force detection means detects the magnitude of the force with which the magnetic substance magnetically attracts the sinter cake. Here, if the detected force is weak, the raising / lowering control means controls the raising / lowering means to lower the support member that supports the magnetic body. As a result, the gap between the magnetic body and the sinter cake is narrowed, so the magnetic attraction of the magnetic body is increased, and the magnetic levitation force acting on the sinter cake is increased. On the other hand, if the detected force is strong, the lifting control means controls the lifting means to lift the support member. As a result, the gap between the magnetic body and the sinter cake widens, and the magnetic attraction of the magnetic body weakens, and the magnetic levitation force acting on the sinter cake decreases. By the above control, the magnetic levitation force acting on the sinter cake can be kept constant. by the way,
Since the magnetic body is supported by the support member, the stronger the magnetic body magnetically attracts the sinter cake, the more the support member is loaded. Therefore, the support member is distorted according to the magnetic attraction force.
Therefore, by detecting such strain, it is possible to detect the magnitude of the magnetic attraction of the sinter cake by the magnetic body. In addition to the magnitude of the magnetic attraction of the sinter cake by the magnetic material, the amount of the gap between the surface of the sinter cake and the lower surface of the magnetic material may be detected and reflected in the above control. However, since the surface of the sinter cake actually has irregularities, it is desirable to control the amount of vertical movement to be roughly adjusted according to the gap amount and to be finely adjusted according to the strain amount. Since the sinter cake needs to be magnetically attracted in a non-contact manner while maintaining a certain gap amount, a strong magnetic material is desirable. A superconducting electromagnet using a superconducting coil is optimal for this.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view showing the configuration of a sinter smelting apparatus according to this embodiment.
In this figure, the sintering raw material stored in the surge hopper 11 is charged into the sintering machine 13 through the raw material charging device 12, then ignited by the ignition furnace 14, and sequentially sintered from the surface layer to the lower layer, In the figure, it solidifies as it is conveyed clockwise and is completed as a sinter cake. A dashed-dotted line 15 in the figure is a sintered melt in which a sintering reaction is performed, and an upper part of the chain line 15 indicates a sintered cake portion in which the sintering reaction is completed.
The portion below the chain line 15 indicates that the sintering reaction is still in the raw material state.

The superconducting electromagnets 20, 20, 20 are located above the pallet 13a where the sintering reaction is carried out, and after the sintering of the surface layer portion is completed by ignition and a sinter cake is formed on the surface layer portion. Are provided, and each is suspended by a support plate 17 via the elevating units 16, 16. Here, the lifting units 16, 16
Is moved up and down the support plate 17 by the control unit described later,
The gap amount between the lower surface of the superconducting electromagnets 20, 20, 20 and the surface of the sinter cake is adjusted. The superconducting electromagnets 20, 20, 20 are provided with a constant current source (not shown).
A constant current is supplied to each. A strain gauge 18 for detecting strain (bending) caused by magnetic attraction is provided near the center of the support plate 17. On the other hand, a gap sensor 19 is provided near the superconducting electromagnet 20, and optically detects the gap amount between the lower surface of the superconducting electromagnet 20 and the surface of the sinter cake, for example.

Next, the electrical configuration of this embodiment will be described. FIG. 2 is a block diagram showing the same configuration. Note that the present application has the main purpose of giving a constant magnetic levitation force to the sinter cake, and therefore other configurations, for example,
The description of the structure for conveying the pallet 13a and the structure for charging the sintering raw material into the pallet 13a is omitted. As shown in FIG. 2, the output of the strain gauge 18 is supplied to the calculation unit 31. The calculation unit 31 calculates the strain amount (bending amount) indicated by the output of the strain gauge 18,
The magnetic levitation force required to generate the strain amount is converted by calculation (or a table in which correspondences are stored in advance) and supplied to the subtraction input terminal of the subtractor 32. Further, the output of the gap sensor 19 is supplied to the calculation unit 33. The calculation unit 33 converts the gap amount indicated by the output of the gap sensor 19 into a magnetic levitation force generated in the gap amount by calculation (or a table in which correspondences are stored in advance), and the subtraction input terminal of the subtractor 34. Supply to.

The setting unit 35 sets the required magnetic levitation force, and outputs a value that is experimentally determined in advance or a value that is arbitrarily set by the manufacturer to output the values to the subtractors 32 and 34. It is supplied to each addition input terminal. Then, the subtractor 32 subtracts the magnetic levitation force converted based on the strain amount from the output value of the setting unit 35 and supplies the magnetic levitation force to the control unit 36 as the displacement amount. Part 3
The magnetic levitation force converted based on the gap amount is subtracted from the output value of 5 and supplied to the control unit 36 as the displacement amount.
The control unit 36 controls the lifting / lowering of the lifting / lowering unit 16 in the direction in which the subtraction results of the subtracters 32 and 34 are set to zero. After roughly adjusting the subtraction result in the direction of zero, the subtracter 32 finely adjusts the subtraction result in the direction of zero.

Next, the operation of the above embodiment will be described. First, when a constant current flows in the superconducting electromagnet 20, the superconducting electromagnet 20 magnetically attracts the sinter cake, so the magnetic force of the sinter cake causes the sinter cake to correspond to the gap amount between the surface of the sinter cake and the bottom surface of the superconducting electromagnet 20. Magnetic stray force is generated. At this time, since the superconducting electromagnet 20 is suspended on the support plate 17, the support plate 17 is distorted (bent) according to the magnetic levitation force. This strain amount is detected by the strain gauge 18, and the calculation unit 3
It is converted by 1 into the magnetic levitation force required to generate it. Since the magnetic levitation force converted by the calculation unit 31 is subtracted from the magnetic levitation force set by the setting unit 35 by the subtractor 32, the subtraction result is the magnetic levitation force currently occurring in the sinter cake. The amount of deviation between the force and the set value is shown based on the amount of strain of the support plate 17.

On the other hand, the gap amount between the surface of the sinter cake and the lower face of the superconducting electromagnet 20 is detected by the gap sensor 19 and converted by the calculation unit 33 into the magnetic levitation force generated in the gap amount. Since the magnetic levitation force converted by the calculation unit 33 is subtracted from the magnetic levitation force set by the setting unit 35 by the subtractor 34, the subtraction result is the magnetic levitation force currently occurring in the sinter cake. The deviation amount between the force and the set value is shown based on the gap amount. By the way, since the surface of the sinter cake actually has irregularities, the gap amount between the surface of the sinter cake and the lower surface of the superconducting electromagnet 20 cannot be accurately detected by the gap sensor 19 and is detected by the strain gauge 18. The accuracy is coarser than the amount of distortion. Therefore, the control unit 36 first roughly adjusts the elevation of the elevating unit 16 in the direction in which the subtraction result of the subtractor 34 becomes zero, and then, the elevating unit 16 in the direction in which the subtraction result of the subtractor 32 becomes zero. Finely adjust the elevation of.

The lifting unit 16 is detected by the strain gauge 18 and the gap sensor 19 as described above.
By repeating the process of coarse and fine adjustment to every predetermined sampling period, magnetic levitation force is applied to the sinter cake in a non-contact manner while keeping the current supplied to the superconducting electromagnet at a constant value. The magnitude of the force can be controlled to be constant.

In the present invention, the gap sensor 19 is an optional component, not an essential component. That is, the strain amount of the support plate 17 is sufficient for the strain gauge 18 alone to detect the magnetic levitation force that actually acts on the sinter cake. The purpose of providing the gap sensor 19 in the above-described embodiment is to control the raising and lowering of the raising and lowering unit 16 mainly on the basis of the strain amount and the gap amount for which the detection accuracy is inferior to that of the strain amount. It is to be a component.

[0016]

According to the present invention described above, it is possible to provide an apparatus for producing a sinter where the magnetic levitation force applied to the sinter cake in a non-contact manner is constant without changing the current value supplied to the electromagnet. Becomes

[Brief description of drawings]

FIG. 1 is a schematic side view showing a configuration of an embodiment according to the present invention.

FIG. 2 is a block diagram showing an electrical configuration of the same embodiment.

[Explanation of symbols]

 16 ... Elevating unit (elevating means) 17 ... Support plate (supporting member) 18 ... Strain gauge (magnetic attraction force detecting means) 19 ... Gap sensor (gap detecting means) 20 ... Superconducting electromagnet (magnetic material) 36 ...... Control unit (elevation control means)

Claims (4)

[Claims] 1. In a sinter ore production apparatus for producing sinter ore by advancing air by sucking air downward, sinter of the surface layer part is completed by ignition of a raw material packed bed, and the sinter ore is burned to the surface layer part. A support member that supports a magnetic body so as to magnetically attract the sinter cake at a point after the sinter cake is generated, and a magnetic attraction force detection that detects the magnitude of the force by which the magnetic body magnetically attracts the sinter cake. Means, elevating means for elevating the supporting member in the vertical direction with respect to the sinter cake, and elevating the elevating means when the force is strong,
An apparatus for producing a sinter comprising: an elevating control means for lowering the elevating means when the force is weak. 2. The apparatus for producing sinter according to claim 1, wherein the magnetic attraction force detecting means detects a strain amount of the supporting member. 3. A gap detecting unit for detecting a gap amount between a surface of the sinter cake and a lower surface of the magnetic body is provided, wherein the elevating unit raises and lowers the detected gap amount when the elevating unit moves up and down. The sinter production apparatus according to claim 1, which is used together with the amount. 4. The apparatus for producing sintered sinter according to claim 1, wherein the magnetic body is a superconducting electromagnet using a superconducting coil.