JP2024014444A - Manufacturing apparatus of agglomerate and control method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing apparatus of an agglomerate which can improve productivity of an agglomerate such as a molding coke, and a control method of the same.

SOLUTION: A manufacturing apparatus of an agglomerate includes a pair of rolls which is fixed and provided at a predetermined gap, raw material supply adjustment means for dividing an amount of a raw material supplied to a gap between the pair of rolls in a width direction, and adjusting the amount, one or more pressure measurement means which are provided on each of the raw material supply adjustment means divided in the width direction, and measure a pressure acting on the raw material to which the pair of rolls is charged, and control means that controls the raw material supply adjustment means and to which a measurement value is supplied from the pressure measurement means, wherein the control means controls the raw material supply adjustment means divided in the width direction on the basis of the measurement value of the pressure by the pressure measurement means, and thereby agglomerates the raw material while controlling the amount of the raw material supplied to the gap between the pair of rolls in the width direction.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to an apparatus for manufacturing an agglomerate and a method for controlling the same.

In recent years, in order to improve the reactivity of coke, carbon-containing substances (coal, etc.) are mixed with a binder and formed into a lump, and then the compacted agglomerate (molded product) is subjected to carbonization treatment. Techniques have been developed to use produced molded coke as a raw material for blast furnaces.

Among molded cokes, one in which a certain amount of iron-containing substances (iron ore, etc.) are mixed with carbon-containing substances (coal, etc.) and molded into a lump is called ferro-coke. As a method for producing molded coke, a method has generally been proposed in which a molded product obtained by agglomerating kneaded raw materials with molding rolls is subjected to carbonization treatment using a vertical carbonization furnace.

Conventionally, in the molding of kneaded raw materials, in order to ensure the quality of the agglomerates within an appropriate range, the variation in pressure between the rolls was suppressed by controlling the roll gap of the molding machine that molded the kneaded raw materials by roll compression. A method has been proposed for adjusting the pressing force when feeding raw materials into rolls.

For example, Patent Document 1 discloses a pair of forming rolls that are pressed with a predetermined pressure by a hydraulic cylinder, the roll gap maintained at this predetermined pressure can be continuously varied, and the number of revolutions can be adjusted; A roll agglomerator is disclosed that includes a body feeding device. The powder supply device of Patent Document 1 includes a screw feeder and its casing installed above a pair of forming rolls.

Japanese Patent Application Publication No. 2011-57970 JP2014-172060A

In Patent Document 1, when a screw feeder rotates to supply and press powder onto a pair of forming rolls and agglomerate the powder into a plate shape with the rotation of the rotating rolls, the gap between the pair of forming rolls is The rotation speed of the screw feeder is controlled so that the gap remains constant.

However, in the technology proposed in Patent Document 1, in order to control the roll gap, a roll gap adjustment mechanism such as a hydraulic servo or an electric drive is required, which not only complicates the configuration of the device but also makes it difficult to adjust the roll gap. Maintenance and management of the mechanism was necessary.

Therefore, it has been desired to ensure high quality of the compacted bodies produced using manufacturing equipment with a simple structure.However, when manufacturing equipment with a simple construction is adopted, conventional control methods have poor controllability. However, it was difficult to automatically control the pressure. Therefore, it was necessary for the operator to constantly monitor the molding pressure and manually control the pressure between the rolls.

On the other hand, Patent Document 2 proposes a control method that suppresses molding pressure fluctuations without controlling the roll gap and makes it possible to ensure the quality of the compacted product within an appropriate range.

However, it has been found that the technique proposed in Patent Document 2 has little effect on uniform dispersion in the width direction of the forming roll. In other words, due to raw material segregation in the raw material hopper on the upper stage of the screw feeder that charges raw materials to the forming rolls, the amount of raw materials charged to the forming rolls varies in the width direction, so the forming pressure on the forming rolls is inconsistent in the width direction. This becomes uniform, which causes a decrease in molding yield.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an agglomerate manufacturing apparatus and a control method thereof that can improve the productivity of agglomerates such as molded coke.

In order to solve the above-mentioned problems and achieve the objects, an apparatus for manufacturing an agglomerate according to the present invention includes a pair of rolls that are fixedly provided with a predetermined gap between them, and a material that is supplied to the gap between the pair of rolls. At least one raw material supply adjusting means is provided for each of the raw material supply adjusting means divided in the width direction and the raw material supply adjusting means divided in the width direction, and the pair of rolls are inputted. pressure measurement means for measuring the pressure applied to the raw material; and control means for controlling the raw material supply adjustment means and to which a measured value is supplied from the pressure measurement means; By controlling the raw material supply adjusting means divided in the width direction based on the measured value of the pressure by the means, the raw material is controlled in the width direction while controlling the amount of raw material supplied to the gap between the pair of rolls. It is characterized by agglomeration.

Further, in the agglomerate manufacturing apparatus according to the present invention, the control means may set a preset target value of the pressure to be applied to the raw material input from the pair of rolls, the target value of the pressure, and the pressure measuring means. A control table composed of the deviation from the measured value of the pressure and the control amount of the raw material supply adjustment means is provided as many as the number of raw material supply adjustment means divided in the width direction, and the target value of the pressure and the Calculate the deviation from the pressure measurement value by the pressure measuring means, find out the control amount of the raw material supply adjustment means in the control table from the target pressure value and the deviation, and use the found control amount. The feature is that each raw material supply adjustment means is controlled based on the above.

In order to solve the above-mentioned problems and achieve the objects, a control method for an apparatus for manufacturing an agglomerate according to the present invention includes: a pair of rolls fixedly provided with a predetermined gap between them; a raw material supply adjusting means that divides and adjusts the amount of raw material supplied to the gap in the width direction; and a raw material supply adjusting means that divides the pressure applied to the raw material fed by the pair of rolls in the width direction. A method for controlling an apparatus for manufacturing an agglomerate, comprising: a pressure measuring means for measuring the number of times as many as The control means adjusts the amount of raw material supplied to the gap between the pair of rolls in the width direction by controlling the raw material supply adjustment means divided in the width direction based on the measured value of the pressure by the pressure measurement means. It is characterized by agglomerating raw materials while controlling the

According to the agglomerate manufacturing apparatus and the control method thereof according to the present invention, when producing an agglomerate by agglomerating kneaded raw materials using a pair of forming rolls, the mixed raw materials are spread across the pair of forming rolls in the width direction. Can be charged uniformly. This makes it possible to produce compacted bodies with high quality and high productivity.

FIG. 1 is a schematic diagram showing the configuration of an apparatus for manufacturing an agglomerate according to an embodiment of the present invention. FIG. 2 is a flowchart showing the flow of a control method for an apparatus for manufacturing an agglomerate according to an embodiment of the present invention.

An apparatus for manufacturing an agglomerate and a method for controlling the same according to an embodiment of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments described below.

(Agglomerate manufacturing equipment)
The configuration of an apparatus for manufacturing an agglomerate according to an embodiment will be described with reference to FIG. 1. In an agglomerate manufacturing apparatus, a pair of rolls are rotated in opposite directions to supply the raw material into the gap, thereby compressing and molding the raw material into an agglomerate (molded product). At this time, the difference in the supply amount in the width direction affects the quality after molding, so if the difference in the supply amount becomes large, the difference in quality of the molded product increases and quality control becomes difficult. Therefore, in the present invention, this deviation is reduced by providing a plurality of raw material supply adjustment means.

As shown in FIG. 1, the agglomerate production apparatus 1 includes a raw material hopper 2, a pair of screw feeders 4, a plurality of adjustment gates 5 and 6, a pair of forming rolls 7, load cells 8 and 9, and a control system. A device 10 is provided.

The raw material hopper 2 has, for example, a funnel shape. The raw material hopper 2 drops raw materials for agglomerates (briquettes), for example, granular powder raw materials (hereinafter referred to as "raw materials") 3 after crushing coal and iron ore and mixing them with a binder (hereinafter referred to as "raw materials"), from a discharge port. .

The screw feeder 4 functions as a raw material transport means for transporting the raw material 3 to the adjustment gates 5 and 6. The screw feeder 4 includes a pair of motors 4a and 4b, each of which is controlled by a control device 10. Each screw feeder 4 transports the raw material 3 introduced into the raw material hopper 2 to the adjustment gates 5 and 6 by rotating, for example, a spiral screw by motors 4a and 4b. In addition, as shown in FIG. 1, the screw feeder 4 also functions as a raw material supply adjustment means for adjusting the amount of raw material supplied to the forming roll 7 in the width direction by being configured with multiple shafts.

The adjustment gates 5 and 6 function as raw material supply adjustment means that divides and adjusts the amount of raw material 3 supplied to the gap (roll gap) between the pair of forming rolls 7 in the width direction. A plurality of adjustment gates 5 and 6 are arranged in a row in the width direction, for example, above a roll gap between a pair of forming rolls 7. In this embodiment, the "width direction" refers to the width direction of the forming roll 7.

The adjustment gates 5 and 6 are equipped with motors 5a and 6a controlled by a control device 10. For example, by moving the adjustment gates 5 and 6 up and down by the motors 5a and 6a, the gate opening degrees of the adjustment gates 5 and 6 are adjusted. By adjusting the opening degrees of the adjustment gates 5 and 6, the amount of raw material 3 supplied to the forming roll 7 is controlled. That is, when the gate opening degree of the adjustment gates 5 and 6 is increased, the amount of raw material 3 inputted increases, and when the gate opening degree of the adjustment gates 5 and 6 is decreased, the input amount of the raw material 3 is decreased.

The pair of forming rolls 7 are provided below the adjustment gates 5 and 6, and are fixed to the manufacturing apparatus 1 in pairs on the left and right with a predetermined roll gap between them. The forming roll 7 is equipped with a motor 7a controlled by a control device 10. The raw material 3 falling and extruded by gravity from the adjustment gates 5 and 6 is supplied to the roll gap of the forming roll 7 . Further, the forming roll 7 is provided with mutually corresponding pockets (not shown) on the rotating surface.

The roll gap of the forming roll 7 is changed depending on, for example, a change in the composition or blending of the raw material 3, but is fixed to a predetermined roll gap while the manufacturing apparatus 1 is in operation. The forming rolls 7 rotate in opposite directions to each other so as to pressurize the raw material 3 passing through the roll gap and push out the compacted agglomerate formed by the pressurization. Further, by adjusting the gate opening degrees of the adjustment gates 5 and 6 arranged above the forming roll 7, the amount of raw material 3 introduced into the roll gap of the forming roll 7 is adjusted.

The load cells 8 and 9 function as pressure measuring means for measuring the pressure exerted on the raw material 3 charged by the pair of forming rolls 7 by the number of adjustment gates 5 and 6 divided in the width direction. The load cells 8 and 9 also function as supply amount estimating means for estimating the supply amount of the raw material 3 from the measured pressure. The load cells 8 and 9 are installed near (outside) the forming rolls 7 and measure the inter-roll pressure between the pair of forming rolls 7. Further, one or more load cells 8 and 9 are provided for each of the adjustment gates 5 and 6 divided in the width direction.

Note that as the supply amount estimating means, a contact or non-contact level meter may be used instead of the load cells 8 and 9.

The control device 10 controls the gate opening degrees of the adjustment gates 5 and 6, and functions as a control means to which measurement values are supplied from the load cells 8 and 9. The control device 10 includes a processing unit including, for example, a CPU (Central Processing Unit), a recording unit including a ROM (Read Only Memory), a RAM (Random Access Memory), a hard disk, etc., and an input unit into which data can be input from the outside. (both not shown). The control device 10 also includes control table storage units 10a and 10b.

The control device 10 controls the gate opening degrees of the adjustment gates 5 and 6 divided in the width direction based on the pressure measured by the load cells 8 and 9, thereby supplying the material to the roll gap between the pair of forming rolls 7. The raw material 3 is agglomerated while controlling the amount of the raw material 3 in the width direction.

In the control device 10, a pressure target value is set in accordance with the composition, blending, etc. of the raw material 3 regarding the pressure in the forming roll 7. This pressure target value data is stored in the control table storage units 10a and 10b of the control device 10. Further, the control table storage units 10a and 10b store table data of, for example, "pressure target value x actual pressure deviation".

Further, the control table 10a stores, for example, pressure target value data regarding the load cell 8 on the back side of the paper in FIG. 1, and table data of "pressure target value x actual pressure deviation". Further, the control table 10b stores, for example, pressure target value data regarding the load cell 9 on the front side of the drawing, and table data of "pressure target value x actual pressure deviation".

The control device 10 is supplied with measured values of the pressure between the forming rolls 7 from the load cells 8 and 9. Then, the control device 10 controls the gate opening degrees of the adjustment gates 5 and 6 by controlling the motors 5a and 6a based on the measured values supplied from the load cells 8 and 9.

The control device 10 is composed of a target value of the pressure applied to the raw material 3 from the forming roll 7, a deviation between the target pressure value and the measured pressure value by the load cells 8 and 9, and a control amount of the adjustment gates 5 and 6. It has the same number of control tables as the adjustment gates 5 and 6. The control device 10 calculates the deviation between the pressure target value and the pressure measurement values by the load cells 8 and 9, and finds the control amount of the adjustment gates 5 and 6 in the control table from the pressure target value and the deviation. . Then, the control device 10 controls the gate opening degree of each of the adjustment gates 5 and 6 based on the determined control amount so that the measured value of the pressure by the load cells 8 and 9 becomes the target value.

In this way, in the manufacturing apparatus 1, the adjustment gates 5 and 6, which are divided into a plurality of sheets in the width direction, are provided above the roll gap of the molding roll 7, and the adjustment gates 5 and 6 are provided on the outside of one of the molding rolls 7. The same number of load cells 8 and 9 as the number of gates 5 and 6 are provided in the width direction.

Thereby, when the raw material 3 is supplied, the load cells 8 and 9 measure the pressure according to the supplied amount. In addition, in the manufacturing apparatus 1, a pressure target value is set in advance to achieve the target molding quality, and adjustment gates 5 corresponding to the same position in the width direction are set so that the measured values of each load cell 8, 9 become the pressure target value. , 6 up and down. By raising the adjustment gates 5 and 6, the supply amount of the raw material 3 increases and the pressure increases, and when the adjustment gates 5 and 6 are lowered, the opposite occurs, so that the raw material 3 at each position increases. It becomes possible to control the supply amount.

(Control method for agglomerate production equipment)
A method for controlling the compacted body manufacturing apparatus according to the embodiment will be described with reference to FIG. 2. In the following, a control method will be described in which the raw material supply adjustment means is a split gate type and the measurement method is the load cells 8 and 9.

First, the measured values of the load cells 8 and 9 (measured pressure values) are supplied to the control device 10 (step S1). Subsequently, the control device 10 processes the measured values (step S2). Subsequently, the control device 10 compares the measured value after the processing and the pressure target value (step S3).

Subsequently, the control device 10 determines whether the absolute value of the deviation between the pressure target value and the measured value is within a preset setting range (step S4). If it is determined in step S4 that the absolute value of the deviation is not within the set range (No in step S4), the control device 10 uses the control table stored in the control table storage units 10a and 10b to determine the output value ( control amount) is searched (step S5). Subsequently, the control device 10 changes the opening degrees of the adjustment gates 5 and 6 based on the found output value (step S6).

Subsequently, the control device 10 determines whether or not the production of the compacted body is in progress (whether or not the production of the compacted body is to be continued) (step S7). If it is determined that the compacted body is not being manufactured (No in step S7), the control device 10 completes this process.

Here, if it is determined in step S4 that the absolute value of the deviation is within the set range (Yes in step S4), the control device 10 performs the processes from step S7 onwards. Further, in step S7, when it is determined that the compacted body is being manufactured (Yes in step S7), the control device 10 returns to step S1 and performs the processing from step S1 onwards.

According to the agglomerate manufacturing apparatus and its control method described above, when producing an agglomerate by agglomerating the kneaded raw materials using the pair of forming rolls 7, the mixed raw materials are transferred to the pair of forming rolls 7 in the width direction. can be charged evenly. This makes it possible to produce compacted bodies with high quality and high productivity.

(Example)
An example of an apparatus for manufacturing an agglomerated body and a method for controlling the same according to an embodiment will be described. In this example, the standard deviation of the molded product ID for each number of adjustment gates was estimated when an adjustment gate was used as the raw material supply adjustment means and a load cell was used as the supply amount estimation means.

Here, it is assumed that the number of adjustment gates and the number of installed load cells are the same. In addition, the quality of the molded product was evaluated using ID strength (30/15) (hereinafter referred to as "molded product ID"). The size of the adult mass is 30 mm x 25 mm x 18 mm (6 cc), and the shape is oval. Furthermore, the estimated effect model assumes that the standard deviation of the molded product ID approaches zero as much as possible when there are an infinite number of adjustment gates and load cells.

In this example, assuming that the control of the adjustment gate is ideally performed (=the pressure of the forming roll for each width unit, that is, the material inflow amount for each width unit is equal), the following formula (1) is used to calculate The standard deviation of molded product ID was calculated.

y=aln(x)+b...(1)
However, x: number of adjustment gates, y: standard deviation of molded product ID, a, b: constant

Among these, the constant b is the standard deviation of the molded product ID when there is one adjustment gate, and since this is 0.045 from the measurement result with the actual machine, the constant is determined as follows.

a=-0.005, b=0.045

Table 1 shows the results of estimating the standard deviation of the molded product ID for each number of adjustment gates using this model formula.

As shown in Table 1, it was confirmed that the standard deviation of the molded product ID decreased as the number of adjustment gates increased. The above results demonstrate the effectiveness of dividing the adjustment gate.

Above, the agglomerate manufacturing apparatus and control method thereof according to the present invention have been specifically explained using the mode for carrying out the invention and examples, but the gist of the present invention is not limited to these descriptions. , shall be interpreted broadly based on the claims. Furthermore, it goes without saying that various changes and modifications based on these descriptions are also included within the spirit of the present invention.

1 Agglomerate production device 2 Raw material hopper 3 Raw material 4 Screw feeder 4a, 4b Motor 5, 6 Adjustment gate 5a, 6a Motor 7 Molding roll 7a Motor 8, 9 Load cell 10 Control device 10a, 10b Control table storage unit

Claims (3)

a pair of rolls fixedly provided with a predetermined gap between them;
Raw material supply adjustment means that divides and adjusts the amount of raw material supplied to the gap between the pair of rolls in the width direction;
one or more pressure measuring means provided for each of the raw material supply adjustment means divided in the width direction, and measuring the pressure exerted on the raw material fed by the pair of rolls;
A control means that controls the raw material supply adjustment means and is supplied with a measured value from the pressure measurement means;
Equipped with
The control means controls the raw material supply adjustment means divided in the width direction based on the measured value of the pressure by the pressure measurement means, thereby controlling the amount of raw material supplied to the gap between the pair of rolls in a widthwise manner. An agglomerate production device characterized by agglomerating raw materials while controlling the direction. The control means controls a preset target value of the pressure to be applied to the raw material fed from the pair of rolls, a deviation between the target pressure value and the measured value of the pressure by the pressure measuring means, and raw material supply. A control table composed of control amounts of the adjustment means is provided as many as the number of raw material supply adjustment means divided in the width direction, and a deviation between the target pressure value and the pressure measurement value by the pressure measurement means is calculated. and searching for a control amount of the raw material supply adjustment means in the control table from the target pressure value and the deviation, and controlling each raw material supply adjustment means based on the determined control amount. The apparatus for producing an agglomerate according to claim 1. A pair of rolls fixedly provided with a predetermined gap between them, a raw material supply adjustment means for adjusting the amount of raw material supplied to the gap between the pair of rolls by dividing the amount in the width direction, and the pair of rolls. pressure measuring means for measuring the pressure exerted on the raw material fed therein by the number of the raw material supply adjusting means divided in the width direction; controlling the raw material supply adjusting means; A method for controlling an apparatus for manufacturing an agglomerate, comprising: a control means supplied;
The control means controls the raw material supply adjustment means divided in the width direction based on the measured value of the pressure by the pressure measurement means, thereby controlling the amount of raw material supplied to the gap between the pair of rolls in a widthwise manner. 1. A control method for an apparatus for producing agglomerates, characterized by agglomerating raw materials while controlling the direction of the agglomerates.

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