JP6544167B2 - Method of controlling particle size of blast furnace charge material and particle size control system therefor - Google Patents

Description

  The present invention relates to a method of controlling the particle size of blast furnace charge material for adjusting the particle size of each of the raw materials cut out from a plurality of raw material storage tanks and charging the material into the blast furnace, and the particle size control device thereof.

In the blast furnace, raw materials (coke and ore) are charged into the furnace from above, and hot metal (further, pulverized coal) is blown from below to produce hot metal.
When charging the raw material into the blast furnace, in order to stabilize the operation of the blast furnace, the raw material cut out from the raw material storage tank is adjusted in particle size in advance by sieving using a sieve.
As a particle size adjustment method of the raw material by this sieve, there exists a technique of an indication in patent documents 1-3, for example.

Patent Document 1 discloses a technique of adjusting the mesh size of a sieve under a raw material storage tank (coke storage) of a blast furnace according to the hot strength of the raw material (coke). Thereby, it is supposed that the average particle diameter of the raw material charged to a blast furnace can be fixed, and the air permeability of a blast furnace can be maintained constant.
In Patent Document 2, a sieve installed in a cut-out portion of a raw material storage tank (raw material tank) of a blast furnace is used as two punched steel plates or two sets of comb tooth nets, one of which is mechanically moved and shifted. Thus, a technique is disclosed that automatically changes the size of the sieve of the sieve. As a result, particle size control can be performed in real time according to the furnace condition, and it is believed that the furnace condition of the blast furnace, in particular, the stability of air permeability can be maintained.
In patent document 3, the movable blind plate which changes a sieve area is provided on the sieve surface under the raw material storage tank (blast furnace charge raw material tank) of a blast furnace, The technology which changes a sieve area and changes a sieve efficiency by moving this. Is disclosed. Thereby, even if the average particle size of the raw material changes, it is supposed that the raw material having a constant average particle size can be charged into the blast furnace.

JP-A-9-287007 JP-A-5-105924 Unexamined-Japanese-Patent No. 5-271725

However, the prior art has the following problems.
The technique of Patent Document 1 needs to perform mesh change when adjusting the mesh size of the sieve, so it can not respond quickly to the particle size fluctuation of the raw material, and the workability is poor.
Moreover, the technique of patent documents 2 and 3 has the complicated structure of a sieve, and maintenance management is difficult.
Furthermore, all the techniques of Patent Documents 1 to 3 are methods of adjusting the average particle size of the raw material. Since the average particle size of the raw material is the average value of the particle sizes of all the raw materials, even if the average particle size is the same value, the particle size configuration is not necessarily the same. For example, even when a large particle size and a large particle size of the raw material are contained in a large amount and the medium particle size of the raw material is small, the average particle size may be the same value. Then, the grain size configuration of the raw material may not be suitable for blast furnace operation, and in this case, the air permeability of the blast furnace can not be maintained constant, and the blast furnace operation may become unstable. Therefore, there has been a demand for a method of adjusting the grain size configuration of the raw material suitable for blast furnace operation, not the average grain size.

  The present invention has been made in view of the above circumstances, and can adjust the particle size configuration of the raw materials which are cut out from the plurality of raw material storage tanks and charged into the blast furnace with a simple configuration, and the blast furnace operation is more than conventional. It is an object of the present invention to provide a method of controlling the particle size of blast furnace charge material capable of achieving stabilization of the above and a particle size control device thereof.

The gist of the present invention made to solve the above problems is as follows.
(1) In the particle size control method of the raw material charged into the blast furnace after being cut out from each of the plurality of raw material storage tanks and sifted with a vibrating sieve provided below each of the raw material storage tanks,
The rotational direction of the vibrating screen for each of the raw material storage tank, and when the forward to circular motion in the flow-down direction in the same direction of the sieve on raw materials, and reversing that circular movement in a direction opposite to the flow-down direction of the screen on the raw material Separately measure the particle size distribution of the material to be screened,
The particle size configuration of the raw material to be charged into the blast furnace is calculated by the combination of normal rotation and reverse rotation which can be taken by each vibrating sieve,
Determining a combination of rotational directions of the respective vibrating sieves that minimize the deviation width from the preset target material particle size configuration suitable for blast furnace operation;
Under the condition that the minimum value of the deviation width satisfies a preset reference , adjusting the particle size configuration of the raw material to be charged into the blast furnace by setting the rotational directions of the vibrating sieves to the combination. A method of controlling particle size of blast furnace charge material characterized by the present invention.

On the condition that (2) the minimum value before Symbol divergence does not satisfy the reference, among the vibrating screen, the wear is characterized by replacing the most advanced sieve screen of the vibrating screen (1) The grain size control method of the blast-furnace charge material as described.

( 3 ) Forward rotation provided in the lower part of a plurality of raw material storage tanks, the rotational direction of which circularly moves in the same direction as the flow direction of the sieve material, or circular movement in the reverse direction of the flow direction of the sieve material A vibrating screen, which can be set to either reverse
Particle size control means for adjusting the particle size configuration of the raw material charged into the blast furnace by changing the combination of the normal rotation and the reverse rotation of each of the vibrating sieves ;
The particle size control means is
The combination of normal rotation and reverse rotation that can be taken by each vibrating sieve based on the particle size distribution of the raw material to be sieved when the rotational direction of the vibrating sieve is normal rotation and reverse rotation for each raw material storage tank, Calculate the particle size composition of the raw material charged into the blast furnace,
Determining a combination of rotational directions of the respective vibrating sieves that minimize the deviation width from the preset target material particle size configuration suitable for blast furnace operation;
A particle size control device for blast furnace charge material , wherein the rotational directions of the respective vibrating sieves are set to the combination under the condition that the minimum value of the deviation width satisfies a preset reference .

  The particle size control method of the blast furnace charge material according to the present invention and the particle size control device thereof is a material charged into the blast furnace by adjusting a combination of normal rotation and reverse rotation of vibrating sieves respectively provided in a plurality of raw material storage tanks. By adjusting the particle size composition of the present invention, the adjustment to the particle size composition of the raw material suitable for blast furnace operation can be carried out with a simple constitution, whereby the blast furnace operation can be stabilized more than before.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing of the particle size control apparatus of the blast-furnace charge material which concerns on one embodiment of this invention. It is a control block diagram of the particle size control device of the same blast furnace charge material. It is a flow figure of a particle size control method of blast furnace charge materials concerning a 1 embodiment of the present invention. It is a graph which shows the influence which the particle size control of coke gives to aeration resistance.

Subsequently, with reference to the attached drawings, an embodiment embodying the present invention will be described by taking coke as an example as a raw material to provide an understanding of the present invention.
As shown in FIGS. 1 to 3, a particle size control apparatus for blast furnace charge material (hereinafter, also simply referred to as a particle size control apparatus) 10 according to an embodiment of the present invention is applied to a blast furnace facility 11. The adjustment of the particle size configuration of the coke (blast furnace charged coke) cut out from the plurality of coke storage tanks (an example of the raw material storage tank) 12 and charged into the blast furnace 13 can be implemented with a simple configuration, This is an apparatus capable of achieving more stable blast furnace operation than ever before. Details will be described below.

As shown in FIG. 1, the blast furnace installation 11 is cut out from a plurality of coke storage tanks (hereinafter simply referred to as tanks) 12 and each tank 12 and temporarily conveys the coke conveyed by a belt conveyor (conveying means) 14 A relay tank (intermediate hopper) 15 to be stored, and a blast furnace 13 into which the coke which has been cut out from the relay tank 15 and transported by the belt conveyor (transport means) 16 is charged.
The number of coke storage tanks 12 is determined according to the scale of the blast furnace, the volume of the coke storage tank, and the like, and is not particularly limited, but is, for example, about 3 to 20.

In the blast furnace 13, coke and sinter are alternately charged in layers, and one layer is called one charge. One charge of coke charged into the blast furnace 13 is not cut out simultaneously from all the tanks 12 but cut out from several tanks 12 as described later. This is because it may be impossible to cut out at the same time depending on the type of coke placed in each tank 12.
Therefore, the tank 12 to be cut out for each charge is determined and cut out, and one cycle is determined so that the amount of cut out from each tank 12 is substantially uniform, and thereafter, the cutting is repeated to repeat this cycle.

  As shown in FIG. 1 and FIG. 2, the particle size control device 10 controls the operation of the vibrating sieves 17 respectively provided below (downstream side) the plurality of coke storage tanks 12 and the particle size controlling means for controlling the respective vibrating sieves 17. And 18).

The vibrating screen 17 performs a circular motion (rotational motion) in the same direction as the flow down direction (flow direction) of the coke (raw material on the sieve) on the screen, or the flow down direction of the coke on the screen The size of the coke on the sieve (ie, the coke charged to the blast furnace) is sifted by sieving the coke cut out from the coke storage tank 12 and flowing down the sieve by reversing the circular motion of the sieve in the opposite direction to that of Make adjustments.
In use, as shown in the dotted line in FIG. 1, when the direction of rotation of the vibrating screen 17 is normal rotation, the coke flow on the screen becomes faster and the sieving efficiency decreases, so that the grains Among the particle size configurations of coke on sieved sieves, those with small diameters can be large enough to remain large on the sieves, and the proportion of those with small particle sizes can be increased. The flow of coke is delayed and the sieving efficiency is improved, and the particles with small particle diameter are sufficiently sieved to reduce the amount remaining on the sieve, and among the particle size composition of the coke on the sieved sieve, The proportion of small diameter can be reduced.

The vibrating screen 17 provided in each of the plurality of coke storage tanks 12 can be set to either forward or reverse rotation direction, and the rotation direction of each vibrating screen 17 is set by the particle size control means 18. In order to adjust the particle size configuration of the coke charged into the blast furnace 13, the combination of the vibrating screen 17 for normal rotation and the vibrating screen 17 for reverse rotation can be changed (adjusted).
The particle size control unit 18 illustrated in FIG. 2 is a computer capable of performing each processing in a recording unit, an operation unit, and a target value deviation range comparing unit described later by a preset program. The computer is a conventionally known computer provided with a RAM, a CPU, a ROM, an I / O, and a bus connecting these elements, but is not limited thereto.

The following information is recorded in the recording unit of the particle size control unit 18:
· Particle size measurement data of coke when the vibrating sieve of each coke storage tank is rotated forward or reverse · Rotational direction of the vibrating sieve that has restriction on rotation direction (forward or reverse)
・ Coke storage tank cutting cycle (cutting tank cycle for each charge)
・ Coke particle size configuration suitable for blast furnace operation (target particle size data)
For example, the particle size measurement data of coke when the vibrating sieve of each coke storage tank is rotated forward or reverse is, for example, that the vibrating sieve 17 of each coke storage tank 12 is rotated forward on the belt conveyor 14 on the upstream side of the relay tank 15 Alternatively, it can be obtained by sampling the coke which has been sifted in reverse and sieving by particle diameter with a sieve having a predetermined opening.
An example of this result is shown in Table 1.

The particle size measurement data of the coke described in Table 1 is sampled from the coke on the belt conveyor after sifting with each vibrating sieve, and the total amount is 100% by mass, a sieve with a predetermined opening (75 mm, 50 mm) , 30 mm and 25 mm) and calculate the proportion of coke in each particle size range (ie 75 mm or more, 50 mm or more and less than 75 mm, 30 mm or more but less than 50 mm, 25 mm or more and less than 25 mm) Of the particle size distribution of
As apparent from Table 1, the coke reservoir No. When the rotational direction of the vibrating sieve is set to normal for 1 to 6, the proportion of small coke particles increases and the average particle diameter is smaller than when set to reverse rotation.

The rotation direction of the vibrating screen having the above-mentioned restriction in the rotating direction is the rotating direction of the vibrating screen which can be operated only in one of the normal rotation and the reverse rotation due to equipment trouble and the like. Moreover, the cutting cycle of a coke storage tank shows which coke storage tank is cut out by each charge of 1 cycle.
An example of these results is shown in Table 2.

The rotational direction of the vibrating screen in Table 2 corresponds to each coke reservoir number. Among the vibrating sieves 1 to 6, the direction of rotation of the vibrating sieve having a restriction in the direction of rotation is indicated by “forward rotation” or “reverse rotation”, and one having no limitation is indicated by “−”.
Moreover, with the extraction cycle of the coke storage tank in Table 2, each coke storage tank No. 1 in 1 cycle performed repeatedly. The cutting out order of 1 to 6 is shown. Specifically, assuming that one cycle is eight charges (multiple charge), the coke storage tank No. 1 is used. Coke storage tank No. 1 and 2 1 set. 3 and 4 in one set, and coke reservoir No. Each coke storage tank No. 5 and 6 in each charge is used as a set of five and six. It shows the presence or absence of the cutting of the coke from 1 to 6.

In the calculation unit, based on the information recorded in the recording unit described above (data in Table 1 and Table 2), the particle size configuration of coke to be charged into the blast furnace when the rotational direction of the vibrating sieve is changed in the coke storage tank. Is calculated (calculating on-sieve coke particle size with all possible combinations of positive and negative).
Here, a method of calculating the ratio of coke having a particle diameter of 75 mm or more (calculated by weighted average) will be described.
Since the total amount of coke cut out in one charge is constant, the amount cut out from each tank differs between the charge cut out from the two tanks and the charge cut out from the four tanks. For example, if the total amount is 4, 2 will be cut out from each tank if cut out from 2 tanks, and 1 will be cut out from each tank if cut out from 4 tanks. Then, taking this into consideration, weighting based on the cycle shown in Table 2 results in coke reservoir No. The weight of 1 and 2 is "6", and the coke storage tank No. The weight of 3 to 6 is "5".

Next, in Table 2, the coke reservoir No. In No. 4, the rotation direction of the vibrating screen is limited to "reverse", and the others are not limited. Here, the coke storage tank No. Except for 4, the particle size measurement data of "75 mm or more" of "forward rotation" in Table 1 is used as a calculation example under the condition of "forward rotation". In addition, coke reservoir No. As for No. 4, since the rotational direction of the vibrating screen is "reverse", the particle size measurement data of "75 mm or more" of "reverse" in Table 1 is used.
From the above, the proportion of coke having a particle size of 75 mm or more to be charged into the blast furnace is calculated as follows.
(3.7 x 6 + 2.5 x 6 + 0.9 x 5 + 2.1 x 5 + 4.4 x 5 + 5.2 x 5) / (6 + 6 + 5 + 5 + 5 + 5) = 3.1 (mass%)

  By the same method as described above, on the premise of the “coke storage tank cutting cycle” described in Table 2, “positive” in the rotation direction of the vibrating sieve of each coke storage tank other than the coke storage tank whose rotation direction is limited. The proportion of coke of each particle size to be charged into the blast furnace, ie, the particle size composition of coke on the sieve, is calculated for all combinations of "version" and "reverse".

Furthermore, in the operation unit, the particle size configuration of the coke on the sieves of each combination obtained by the above-described method is different from the target particle size configuration (target particle size data) set in advance suitable for blast furnace operation. Is calculated.
Specifically, the particle size configuration of the coke on the sieve of each combination described above is calculated using the following equation (1).
{{(Target value-calculated value) / target value} ² ... (1)

Here, the calculated value is the mass ratio (mass%) for each particle size range of the particle size configuration calculated by the above method, and the target value is the mass for each particle size range of the target particle size configuration set in advance. It is a ratio (mass%).
Note that “Σ” is the sum of the calculation results obtained for each particle size range, and specifically “((75 mm or more calculation result) + (50 mm to 75 mm calculation result) + (30 mm to 50 mm) Calculation result of less than +) (Calculation result of 25 mm or more and less than 30 mm) + (Calculation result of less than 25 mm) ".

In the target value deviation width comparing unit, among the particle size configurations of coke on the sieves of each combination, a comparison is made as to whether the minimum value of the deviation width calculated by the above-mentioned calculating unit satisfies the preset criteria. It will be.
Specifically, it is calculated using the following equation (2).
Minimum value of [Σ {(target value-calculated value) / target value} ² ] <0.1 (2)
Here, “0.1” is an experience value obtained from past operation results, and if it is less than this experience value, it means that stable operation of the blast furnace is possible.

The calculation unit and the target value deviation range comparing unit match the grain size configuration of the coke charged into the blast furnace with the grain size configuration of the target coke set in advance (that is, the grain size of coke charged into the blast furnace) It is a part which performs calculation for adjusting the configuration.
Therefore, if it can be judged whether the particle size composition of the coke cut out from each coke storage tank can be brought close to the particle size composition of the target coke, it will not be limited to the use of the above-mentioned formula.
For example, in the above equation (1), the square of {(target value−computed value) / target value} means that the value calculated is “positive” for the purpose of comparison in the target value deviation range comparing unit. In order to Therefore, it is not necessary to necessarily use the square, and it may be an absolute value of {(target value−calculated value) / target value}. In this case, the experience value used in the target value deviation range comparing unit is also changed.

When the target value deviation width comparison unit satisfies the above-mentioned equation (2) (that is, less than 0.1 (Σ <0.1)), the rotation of each vibrating sieve is used in combination of conditions under which this minimum value can be obtained. Set the direction.
On the other hand, when the expression (2) is not satisfied (ie, 0.1 or more (Σ 0.1 0.1)), the screen of the vibrating screen with the most advanced wear is replaced. In addition, the screen with the progress of wear is basically a screen with a long use period (old). After replacing the sieve, measure the particle size of coke when the vibrating sieve is rotated forward or reverse, and set the combination of the rotational directions of the vibrating sieves to be the particle size configuration suitable for blast furnace operation by the above method. Control the particle size of coke charged to the blast furnace.

As described above, the particle size control means 18 changes (adjusts) the combination of the vibrating screen 17 set for normal rotation and the vibrating screen 17 set for reverse rotation to control the particle size of coke charged into the blast furnace. Can.
Note that the combination of the normal rotation and the reverse rotation of the vibrating screen 17 is changed each time any one or two or more of the following 1) to 3) are performed.
1) When the particle size measurement data of the coke obtained by performing the sieving process by the normal rotation and the reverse rotation of the vibrating sieve for each coke storage tank is changed (that is, when the particle size measurement data in Table 1 is changed).
2) When the coke storage tank to be cut out of the coke to be charged into the blast furnace is changed (that is, when the cutting cycle of the coke storage tank is changed in Table 2).
3) When it is necessary to change the rotational direction of the vibrating screen due to equipment problems (that is, when the rotational direction of the vibrating screen in Table 2 is changed).

Then, the particle size control method of the blast furnace charge raw material based on one embodiment of this invention is demonstrated, referring FIG.
First, particle size control is performed when any one or more of the following 1) to 3) are performed.
1) Modification of coke particle size measurement data obtained by performing sieving processing by rotating and reversing the vibrating sieve for each coke storage tank (that is, changing the particle size measurement data in Table 1).
2) Change of coke storage tank to be cut out of coke to be charged into the blast furnace (i.e., change of cutting cycle in Table 2).
3) Change in the rotational direction of the vibrating screen due to equipment problems (ie, changing the rotational direction of the vibrating screen in Table 2).

An example of the equipment trouble of 3) mentioned above is, for example, a trouble of a belt conveyor (conveying means) which conveys coke under the sieved by a vibrating sieve. In this case, it is necessary to reduce the amount of coke under the screen to be screened, in which case, in the step described later, the direction of rotation of the vibrating screen to be subjected to the trouble is Change the normal rotation and reverse rotation of the other vibrating screen while fixing to the).
In addition, the event which performs particle size control of blast furnace charge raw material is not limited to above-mentioned 1)-3), According to operation conditions etc., another event may be included.

In the particle size control method of the blast furnace charging material, first, in step 1 (ST1), the following is recorded in the recording unit.
· Particle size measurement data of coke when the vibrating sieve of each coke storage tank is rotated forward or reverse · Rotational direction of the vibrating sieve that has restriction on rotation direction (forward or reverse)
・ Coke storage tank cutting cycle (cutting tank cycle for each charge)
-Coke particle size configuration suitable for blast furnace operation Next, in step 2 (ST2), based on the set values (for example, data in Table 1 and Table 2) input by the calculation unit, the coke septic tank of the vibrating sieve Calculate the grain size configuration of coke charged to the blast furnace when the direction of rotation is changed (calculation of on-screen coke grain size in combination with forward and reverse).

In step 3 (ST3), how much the particle size configuration of the coke on each sieve obtained in step 2 described above differs from the preset target particle size configuration suitable for blast furnace operation by the operation unit The presence or absence is calculated using equation (1) described above.
In step 4 (ST4), the target value deviation width comparison unit determines whether the minimum value of the deviation width calculated in step 3 described above among the particle size configurations of the coke on each sieve satisfies a preset reference. A comparison is made using equation (2) above.

Here, when the equation (2) is satisfied (in the case of less than 0.1: Yes), in step 5 (ST5), an instruction to change the rotational direction of the vibrating screen to give the condition of this minimum value is issued. . According to this instruction, the combination of the normal rotation and the reverse rotation of the vibrating screen is changed, and the setting of adjusting the particle size configuration of the coke charged into the blast furnace is performed.
On the other hand, when the expression (2) is not satisfied (in the case of 0.1 or more: No), at step 6 (ST6), an instruction to replace the mesh which is in progress of wear is given. The screen is replaced in accordance with this instruction, and particle size control is performed again from step 1.

Next, an example carried out to confirm the operation and effect of the present invention will be described.
Here, with respect to the conventional example and the example, the influence of the grain size control of the coke was examined using the upper air flow resistance. The results are shown in FIG. In addition, the dotted line in FIG. 4 has shown the average value of the upper ventilation resistance of 2 days of each of a prior art example and an Example. The upper air flow resistance is calculated using the following equation (3).
{(U _P × 1.01972 × 10 ⁻⁵ +1.033) ² − (T _P × 1.01972 × 10 ⁻⁵ +1.033) ² } / [V _BOSH + {(SLC × 22.4) / 12 } × PIG × (1/1440)] ^1.7 (3)
U _P : Shaft section 2 step pressure (Pa)
T _P : furnace top pressure (Pa)
V _BOSH : Bosch gas amount (Nm ³ / m)
SLC: Solution loss carbon amount (kg / t-p)
PIG: Production of pig iron (t / D)

  Moreover, in FIG. 4, the particle size control of the coke was changed after performing it by a prior art example (coke particle size management change), and it carried out by the Example. The conventional example is a result of adjusting only the average particle size of the coke cut out from each coke storage tank and adjusting the particle size of the coke charged to the blast furnace, and the example is a plurality of cokes It is the result at the time of adjusting the particle size composition of the coke charged to a blast furnace by changing the combination of the normal rotation of the oscillating sieve provided in the storage tank, and the reversal.

As apparent from FIG. 4, in the conventional example, the value of the upper air flow resistance varies (standard deviation σ: 0.0217), but in the example, the variation in the upper air flow resistance can be reduced more than in the conventional example. (Standard deviation σ: 0.0175).
That is, it has been confirmed that the blast furnace operation can be stabilized more than before by using the method for controlling the particle size of blast furnace charge material of the present invention (particle size control device for blast furnace charge material).

Although the present invention has been described above with reference to the embodiment, the present invention is not limited to the configuration described in the above-described embodiment, and the items described in the appended claims It also includes other embodiments and modifications that are considered within the scope. For example, the method of controlling the particle size of the blast furnace charge material of the present invention and the particle size control device of the present invention may be included in the scope of the present invention by combining some or all of the above-described embodiments and modifications.
Moreover, in the said embodiment, although the case where coke was used as a raw material was demonstrated, if it is a raw material inserted in a blast furnace, it will not be specifically limited, For example, an iron source (lumped ore or sinter ) May be. In addition, if a raw material is an iron source, a raw material storage tank turns into an iron source storage tank.

10: Particle size control device for blast furnace charge material, 11: blast furnace equipment, 12: coke storage tank (raw material storage tank), 13: blast furnace, 14: belt conveyor, 15: relay tank, 16: belt conveyor, 17: vibrating sieve 18: Particle size control means

Claims (3)

In the particle size control method of the raw material charged into the blast furnace after being cut out from each of the plurality of raw material storage tanks and sifted with a vibrating sieve provided below each of the raw material storage tanks,
The rotational direction of the vibrating screen for each of the raw material storage tank, and when the forward to circular motion in the flow-down direction in the same direction of the sieve on raw materials, and reversing that circular movement in a direction opposite to the flow-down direction of the screen on the raw material Separately measure the particle size distribution of the material to be screened,
The particle size configuration of the raw material to be charged into the blast furnace is calculated by the combination of normal rotation and reverse rotation which can be taken by each vibrating sieve,
Determining a combination of rotational directions of the respective vibrating sieves that minimize the deviation width from the preset target material particle size configuration suitable for blast furnace operation;
Under the condition that the minimum value of the deviation width satisfies a preset reference , adjusting the particle size configuration of the raw material to be charged into the blast furnace by setting the rotational directions of the vibrating sieves to the combination. A method of controlling particle size of blast furnace charge material characterized by the present invention. On condition that the minimum value of the divergence does not satisfy the reference, among the vibration sieve, blast furnace instrumentation according to claim 1, characterized in that exchanging the sieve screen of the vibrating sieve wear is most advanced Particle size control method for incoming material. A forward rotation in which the rotational direction is circularly moved in the same direction as the flow direction of the sieve material, or a reverse rotation in which the circular movement is reverse to the flow direction of the sieve material. A vibrating screen, which can be set to either
Particle size control means for adjusting the particle size configuration of the raw material charged into the blast furnace by changing the combination of the normal rotation and the reverse rotation of each of the vibrating sieves ;
The particle size control means is
The combination of normal rotation and reverse rotation that can be taken by each vibrating sieve based on the particle size distribution of the raw material to be sieved when the rotational direction of the vibrating sieve is normal rotation and reverse rotation for each raw material storage tank, Calculate the particle size composition of the raw material charged into the blast furnace,
Determining a combination of rotational directions of the respective vibrating sieves that minimize the deviation width from the preset target material particle size configuration suitable for blast furnace operation;
A particle size control device for blast furnace charge material , wherein the rotational directions of the respective vibrating sieves are set to the combination under the condition that the minimum value of the deviation width satisfies a preset reference .

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