JP2000178628A - Device and method for switching tilting runner of blast furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately switch a tilting runner by precisely detecting the height of molten iron received in a torpedo car(TPC) even in the case of causing foaming. SOLUTION: When actual molten iron receiving work is executed, the received molten iron quantity (w) into the TPCs 23, 24 and the received molten iron surface level L are detected. A converted graph 6 plotting these detected values to the corresponding positions, is made and held, and when the actual molten iron receiving work thereafter is executed, the received molten iron quantity (w) in the TPC is sequentially detected and the detected value is converted into the molten iron surface level L' according to the converted graph 6. Even in the case of causing the foaming in the TPC, the changeover of the tilting runner 25 is suitably executed by executing the changeover decision of the tilting runner 25 according to the converted molten iron surface level L' so as not to use the molten iron surface level L itself measured by using a microwave but so as to enable the execution of the changeover decision of the tilting runner 25 based on the received molten iron quantity (w).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for switching a slanted gutter of a blast furnace, and more particularly to a recording medium. More particularly, the present invention relates to a slanted gutter switching apparatus used for switching a mixed iron wheel receiving hot metal from a blast furnace and a method of controlling the switching. It is suitable for use in

[0002]

2. Description of the Related Art Generally, in an iron making process, FIG.
As shown in FIG. 2, hot metal produced from raw materials such as iron ore and coke in the blast furnace 21 is mixed with a mixed iron wheel (torpedo car:
Hereinafter, these are abbreviated as TPCs) 23 and 24, and are conveyed to the converter 22, where the components are adjusted. At this time, a plurality of rails, such as a first line and a second line, are provided on the blast furnace 21 side, and a plurality of TPCs 23 and 24 are appropriately moved on these rails. Accepted through the iron.

That is, while the tap hole 26 of the blast furnace 21 is open for a long time and tapping is continuously performed,
There is a limit to the capacity that can be received by one TPC (for example, 3
(About 00 t) Since it cannot be received by only one unit, it is necessary to receive the iron by using a plurality of TPCs 23 and 24 in order. At this time, it is the inclined gutter 25 that switches which of the rails receives the TPC.

[0004] For example, when the TPC 23 on the first line receives the hot metal to a predetermined level (height), the inclined pouring gutter 25 is switched to be inclined toward the second line. And this 2
At the same time, the TPC 24 on the track starts receiving iron and the TPC 23 loaded with hot metal is moved toward the converter 22. After that, another empty TPC that has finished transferring the hot metal to the converter 22 enters the track 1.

While the hot metal is being conveyed from the blast furnace 21 to the converter 22, a pipe 30 is inserted from above the TPC, a predetermined gas is blown from the pipe 30, and the hot metal is separated into hot metal and other than hot metal to be unnecessary. The hot metal pretreatment of discarding slabs is performed. In this hot metal pretreatment, the level of hot metal to be received by the TPCs 23 and 24 from the blast furnace 21 needs to be strictly controlled so as to have a predetermined height because of the necessity of placing the pipe 30 in an appropriate position in the hot metal. .

Conventionally, the level of hot metal received in the TPC, that is, the level of the hot metal received by the TPC, has been detected mainly using a level meter using a microwave or the like. That is, a level gauge is provided above a position where the TPCs 23 and 24 stop on the rails in order to receive iron from the blast furnace 21. Then, the height of the hot metal stored in the TPC was measured by irradiating the hot metal in the TPC with microwaves and measuring the time until the hot metal was reflected from the molten metal surface and returned. Switching of the inclined gutter 25 is performed when the measurement level reaches a predetermined value.

[0007]

When the TPCs 23, 24 receive hot metal from the blast furnace 21 through the inclined gutter 25, a process for adjusting a part of the hot metal, such as a desiliconization process, is performed. Done. In this desiliconization treatment, a silicide such as room dust or calcium carbide is injected into the decanter gutter 25 or TPC2.
It is mixed with the hot metal in 3, 24 to reduce the silicon in the hot metal by a chemical reaction.

When such desiliconization treatment is performed, TPC2
A phenomenon called forming often occurs in 3, 24. Forming refers to the generation of foamy slag on the surface of hot water. When such a forming occurs, the level meter using the microwave generates a TPC2
It becomes impossible to accurately measure the height of the molten metal surface in 3, 24. Therefore, in some cases, the inclined gutter 25
There is a problem that the switching timing is missed and the molten metal overflows.

On the other hand, the weights of the TPCs 23 and 24 received are weighed (load cells) 27 and 2 embedded in the rails of each line.
8 has been proposed. However, in the load cells 27 and 28, the weights of the TPCs 23 and 24 themselves are measured together with the actual amount of received iron. Refractory bricks are stuck inside the TPCs 23 and 24 so as not to cool the hot metal received.
This brick wears as it is used more times,
The weight of the PCs 23 and 24 changes.

In this case, simply load cell 2
In the conventional method of detecting the amount of received iron based on the weight measured in 7, 28, such a degree of wear of the refractory brick is not considered,
At a certain weight level, pig iron was terminated. Therefore, an error from the actual amount of received iron is likely to occur, and T
There is a problem that it is difficult to accurately stop the pig iron at a predetermined height in the PCs 23 and 24.

Although only three TPCs are shown in FIG. 2, more TPCs are used in the actual operation, and various TPCs perform the work of receiving iron on one line. ing. In this case, each TPC has an individual difference, and each has a different weight. On the other hand, although the same TPC may move to a different track and perform pig iron receiving, each of these tracks also has individual differences, and even with the same TPC, the result of the measured weight may differ depending on the track.

[0012] However, in the conventional method of switching the inclined gutter based on the weight measurement, the TPC and the individual difference of the track are not taken into account, and the iron receiving of the TPC is terminated when a certain weight level is simply detected. In this case, errors from the actual amount of received iron are liable to occur.
There is a problem that it is difficult to accurately stop the pig iron at a predetermined height in the area 4.

The present invention has been made in order to solve such a problem. Even when forming occurs, the height of the hot metal surface of the hot metal received in the TPC is accurately detected and the injection is performed. An object of the present invention is to make it possible to appropriately switch gutters. The present invention also accurately detects the level of the molten metal surface from the receiving weight of the TPC in consideration of the degree of wear of the refractory bricks in the TPC and individual differences of each TPC and each wire,
An object of the present invention is to make it possible to appropriately perform switching of the inclined gutter.

[0014]

SUMMARY OF THE INVENTION According to the present invention, there is provided a blast furnace inclined pouring gutter switching apparatus, which receives hot metal discharged from a blast furnace through a inclined pouring gutter into a mixed iron wheel, thereby controlling the degree of acceptance of the mixed iron wheel. In the tilting gutter switching device of the blast furnace, which switches the tilt of the tilting gutter according to the received-iron amount detecting means for detecting the weight of the received pig iron in the mixed iron wheel, and detects the level of the hot metal level of the hot metal received in the mixed iron wheel. Level detection means, based on the received-iron weight detected by the received-iron amount detection means and the molten metal level detected by the level detection means, information indicating the correspondence between the received-iron weight and the molten metal level is displayed. Correspondence information creation and holding means to create and hold, based on the pig iron weight detected by the pig iron quantity detection means, using the correspondence information between the pig iron weight and the level of the molten metal, Switching determination means for performing switching determination. The features.

According to another aspect of the present invention, when the hot metal spouted from the blast furnace is received by the pig iron wheel via the tipping gutter, the inclination of the tipping gutter is switched in accordance with the degree of receiving the pig iron. In the tilting gutter switching device of the blast furnace, the received-iron amount detecting means for detecting the received-iron weight in the mixed iron wheel, the level detecting means for detecting the level of the hot metal received in the mixed-iron wheel, Based on the hot metal weight detected by the detecting means and the molten metal level detected by the level detecting means,
Conversion information creating / holding means for creating and holding information for converting the received iron weight to the molten metal level, and converting the received iron weight detected by the iron receiving amount detecting means to the molten metal level according to the conversion information. And a switching determining means for determining whether to switch the inclined gutter based on the molten metal level converted by the converting means.

Here, in another aspect of the present invention, the conversion information is created for each of the mixed-iron cars and for each of the track numbers where the mixed-iron cars receive iron from the blast furnace. Further, in another aspect of the present invention, the conversion information created and held by the conversion information creation / holding means is determined by the iron receiving weight and the molten metal level detected by the iron receiving amount detection means and the level detection means. It is characterized by comprising conversion information correction means for sequentially correcting. In this case, the conversion information correction means may receive information on the number of times of use of the mixed iron wheel, and may correct the conversion information in consideration of the number of times of use, or the mixed iron wheel in the converter. The actual weighed value of the hot metal actually received from the controller may be received, and the conversion information may be corrected in consideration of the actual weighed value.

According to another aspect of the present invention, any of the forming detecting means for detecting the occurrence of forming in the mixed iron wheel, and the amount of received iron and the level detecting means depending on whether or not the forming has occurred. And a use switching unit for switching whether to perform the switching determination of the inclined gutter using the above-mentioned method. When the forming is not occurring, the inclined gutter is detected by using the molten metal level detected by the level detecting unit. When the forming is occurring, the switch determination of the inclined gutter is performed by using the molten steel level converted from the weight of the received iron detected by the received iron amount detecting means according to the conversion information. It is characterized by performing.

According to another aspect of the present invention, when the hot metal spouted from the blast furnace is received by a mixed iron wheel through a tilting gutter, the inclination of the tilting gutter is switched in accordance with the degree of receiving the molten iron. In the tilting gutter switching device of the blast furnace, the received-iron amount detecting means for detecting the received-iron weight in the mixed iron wheel, and the level detecting means for detecting the molten metal level of the hot metal received in the mixed-iron wheel,
Based on the received-iron weight detected by the received-iron amount detecting means and the molten-water level detected by the level detecting means, reference information for detecting and holding the received-iron weight when the molten metal level reaches a predetermined level. Detection / holding means, and switching determination means for performing switching determination of the inclined gutter according to whether or not the received pig weight detected by the received-iron amount detecting means has reached the held reference received-iron weight. It is characterized by having.

Further, the method for switching the inclined pouring gutter of the blast furnace according to the present invention is characterized in that, when the hot metal discharged from the blast furnace is received by the pig iron wheel via the inclined pouring gutter, the inclined pouring is performed in accordance with the degree of receiving the molten pig iron. In the method of changing the inclination of the gutter, the method of changing the inclination of the blast furnace, in the actual iron receiving operation, detects the weight of the hot metal received by the mixed iron wheel and the molten metal level received by the mixed iron wheel, and detects the detected weight of the received iron. And the step of creating and holding conversion information for converting the weight of the received iron to the level of the molten metal based on the level of the molten metal and the level of the received iron in the mixed iron wheel during the actual iron receiving operation thereafter. Detecting and converting the received iron weight into a bath level according to the conversion information previously created and held, and determining whether the converted bath level from the received iron weight has reached a certain level. And when it reaches Characterized by a step of the switch the.

Here, in another aspect of the present invention, the conversion information is created for each of the mixed-iron cars and for each of the number lines where the mixed-iron cars receive iron from the blast furnace. Further, another aspect of the present invention is characterized in that the method includes a step of sequentially correcting the previously created and held conversion information based on a receiving weight and a molten metal level detected during an actual receiving operation. I do. In this case, in the step of correcting the conversion information, the conversion information may be corrected in consideration of the number of uses of the mixed iron wheel, or the hot metal actually received from the mixed iron wheel in the converter may be used. The conversion information may be corrected in consideration of the actual weighed value.

In another aspect of the present invention, the step of detecting the occurrence of forming in the mixed iron wheel and using any of the detected values of the weight of the received iron and the level of the molten metal in accordance with the presence or absence of the occurrence of the forming. And performing a step of switching whether to perform the switching determination of the inclined gutter. When the forming is not occurring, the switching determination of the inclined gutter is performed using the detected value of the molten metal level, and the forming is performed. When the occurrence of the hot water flow rate is detected, the switching determination of the inclined pouring gutter is performed using the molten metal level converted from the detected value of the received pig weight according to the conversion information.

Further, a computer-readable recording medium according to the present invention is characterized in that a program for causing a computer to function as each means according to any one of claims 1 to 8 is recorded. According to another aspect of the present invention, a program for causing a computer to execute the processing procedure of the inclined blast furnace gutter switching method according to any one of claims 9 to 14 is recorded.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram illustrating a functional configuration of a tilting gutter switching device according to a first embodiment of the present invention. The function of each block is actually a CPU, ROM, R
The processing is realized by a process computer (hereinafter, referred to as a processing computer) having an AM or the like. Note that in FIG. 1, components denoted by the same reference numerals as those illustrated in FIG. 2 have the same functions, and thus detailed description thereof will be omitted.

In FIG. 1, reference numeral 1 denotes a receiving capacity calculation unit;
TPC2 containing hot metal measured by load cells 27 and 28
Based on the total weights a ₁ and a ₂ of the TPCs 23 and ₂ ,
4 is calculated. That is, when the TPCs 23 and 24 enter a certain track and stop at the receiving position, first, the tare weight (empty weight) of the TPC is measured and recorded. Thereafter, by subtracting the tare weight from the total weights a ₁ and a ₂ sequentially measured after starting the pig iron receiving, the actual pig iron receiving amount w is sequentially calculated.

When the TPCs 23 and 24 enter the receiving position, the molten iron usually returns to the converter 22 after being transferred to the converter 22, so that the contents of the TPCs 23 and 24 are empty.
Therefore, in this case, if the weight at the time when the TPCs 23 and 24 first stop at the receiving position is determined,
This indicates the weight of C itself, that is, the tare weight.

On the other hand, when the TPCs 23 and 24 enter the receiving position, some molten iron may already be contained. For example, in the example of FIG. 2, there are two rails, and only one tap hole 26 of the blast furnace 21 is provided. However, depending on the operation, there are four or eight rails,
Two or four tap holes 26 may be provided. In this case, the amount of received iron does not reach the predetermined level only by receiving iron from a certain tap hole, and the TPC may move to a certain line of another tap hole in order to perform addition.

In a process in which there are a plurality of blast furnaces 21, the TPC may move between the blast furnaces. In these cases, the TPC enters the receiving position with a certain amount of hot metal. In this case, a business computer (hereinafter referred to as a vidicon), which is a higher-level computer of the process controller, etc., grasps how much of the hot metal the TPC runs. So T
The tare weight can be calculated by subtracting the weight of the excess hot metal grasped by the vidicon from the measured weight when the PCs 23 and 24 first stop at the receiving position.

Next, reference numeral 2 denotes a level analysis section, based on the reflection time of the microwave on the molten metal surface measured by the microwave level meters 3 and 4, based on the molten metal surface of the hot metal stored in the TPCs 23 and 24. The level L is analyzed. The molten metal level L actually analyzed in the present embodiment is, as shown in FIG.
It is not the height from the bottom but the depth from the opening above the TPC. This is because the refractory brick wears out inside the TPC every time it is used, so that an accurate level cannot be measured based on the bottom.

Reference numeral 5 denotes a conversion graph creation / correction unit, and reference numeral 6 denotes a conversion graph holding unit. The conversion graph holding unit 6 holds and manages a graph for converting the received iron amount w of the TPCs 23 and 24 calculated by the received iron amount calculation unit 1 into the molten metal level L ′ for each TPC and each line. Is what you do. Here, in the conversion graph, for example, the horizontal axis represents the weight, and the vertical axis represents the level of the molten metal, and represents the correspondence between the two. The conversion graph creation / correction unit 5 creates the above-described conversion graph at an early stage, and after the creation, appropriately corrects the created conversion graph.

That is, the conversion graph creation / correction unit 5
During the actual work of the iron making process, every time the pig receiving amount calculation unit 1 and the level analysis unit 2 determine the receiving amount w and the level L of the molten metal at each predetermined point, the measuring point is set at the corresponding position on the conversion graph. Plot. In the present embodiment, about ten measurement points are taken during one iron receiving operation for one TPC, and these are plotted. Then, one conversion graph is created by linearly interpolating between the measurement points. Such an operation is performed for each TPC and each line, and separate conversion graphs are created.

Since there is no conversion graph until ten measurement points are first obtained, a three-dimensional approximation curve as shown in FIG. 1 is used as the conversion graph during this period. The three-dimensional approximation curve is used
Since the container in which the hot metal of the TPCs 23 and 24 is filled has a cylindrical shape (the cross-sectional shape is a circle), the degree of increase of the molten metal level L increases with an increase in the amount of received iron w at the bottom and upper portions of the container. This is because in the middle abdomen, the degree of increase in the molten metal level L becomes smaller as the amount of received iron w increases.

Since the correspondence between the amount of received iron w and the level L of the molten metal is represented by a three-dimensional approximation curve, the ten measurement points, which are the aforementioned predetermined points, must be taken equally. Instead, it is preferable that the metal level is relatively "dense" when the metal level L is large and small, and relatively "sparse" when the metal level L is medium.

After the conversion graph is created by taking about 10 measurement points at the time of the first iron receiving operation, the conversion graph creation / correction unit 5 performs the next operation after the actual iron receiving operation. And the amount of received iron w at each predetermined point in the level analysis unit 2.
Each time the level L is obtained, the conversion graph is corrected by re-plotting the measurement points at the corresponding positions on the conversion graph created up to the previous time. In this way, every time a certain TPC executes a pig iron receiving operation on a certain line, the conversion graph corresponding to the TPC and the line is corrected, thereby learning (evolving) the conversion graph.

It should be noted that there are a plurality of TPCs, and there are a plurality of wire lines each of which receives TPC. Therefore, a correction coefficient is provided for each TPC and for each wire line. The correction uses, for example, a Kalman filter or the like. This correction can be performed using only the actual measurement values of the amount of received iron w and the level of the molten metal level L as described above. ) And a converter actual weighing value of 8 are more preferably used.

For example, the refractory bricks in the TPCs 23 and 24 wear as the number of times of use increases, so that
The capacity of 24 gradually increases. Therefore, after the first time capacity is given to the conversion graph creation / correction unit 5, the TPC2
The number of times of use of 3, 24 is given as information. On the other hand, the conversion graph creation / correction unit 5 is provided with a calculation formula empirically obtained as to how much the capacity increases depending on the number of times the TPC is used. At the time of correction of the conversion graph, in consideration of this calculation formula, the next acceptable amount is predicted according to the number of times of use of the TPC, and is reflected in the conversion graph.

By the way, before a certain TPC returns to the same track, it often goes around another track or a blast furnace several times. At this time, in this embodiment, the conversion graph is represented by each TP.
Although management is performed for each C and each line, if only the number of times of use of a certain line in a conversion graph of a certain TPC is counted, an error occurs with the actual number of times of use. Therefore, for one TPC, the number of times of use on all the track lines is counted and given to the conversion graph creation / correction unit 5.

In this embodiment, the weight of the hot metal received by the load cells 27 and 28 provided on the rails near the blast furnace is measured. However, there are individual differences in the load cells of each line, and the same TPC is used for each line. There may be differences in the results of the measured weight. Therefore, as shown in FIG. 2, a weight meter 29 is provided in the converter 22, and the weights a1 'and a2' when the converter 22 actually receives the hot metal from the TPCs 23 and 24 are measured. Then, a value obtained by subtracting the tare weight of the converter 22 from the weights a1 'and a2' is provided to the conversion graph creation / correction unit 5 via a vidicon (not shown) as a converter actual weighing value 8.

The conversion graph creating / correcting section 5 calculates the load cell 27, the load cell 27 based on the measured iron receiving amount w in the blast furnace 21 calculated by the iron receiving amount calculating section 1 and the above-mentioned converter actual weighing value 8. The conversion graph is corrected so as to eliminate the individual difference between 28. More specifically, the amount of received TPC w (a1, a2) in each of the load cells 27, 28 is corrected based on the actual converter weighing value 8 (a1 ', a2'), so that each line number is corrected. Eliminate errors.

The contents of correction of the conversion graph by the conversion graph creation / correction unit 5 as described above are displayed on the display 9. The operator can manually correct apparently strange portions or the like by looking at the display screen.

Next, reference numeral 10 denotes a received-iron amount-level conversion processing unit, which stores the received-iron amount w sequentially calculated by the received-iron amount calculation unit 1 during the actual receiving operation, in the conversion graph holding unit 6. Based on the corresponding TPC and the conversion graph of the number line, a process of converting to the molten metal level L 'is performed. Numeral 11 denotes a tilting gutter switching determination unit, and the above-mentioned pig iron receiving amount-level conversion processing unit 1
It is determined whether or not the molten metal level L ′ converted by 0 has reached a predetermined constant level, and when it has reached, a control signal is output so as to switch the inclination of the decanter gutter 25.

As described above, according to the inclined pouring gutter switching apparatus of the present embodiment, the amount of received iron w is sequentially calculated during the receiving operation, and the molten metal level is calculated in accordance with the conversion graph prepared and corrected in advance. It is determined whether or not a certain level has been reached after conversion to L '. As described above, in the present embodiment, the inclined pipe 25 is not based on the molten metal level L itself measured by the microwave level meters 3 and 4 but on the basis of the amount of received iron w.
Is determined. Accepted w of TPC23,24
Can be measured irrespective of whether or not forming has occurred, so that even when forming has occurred in the TPC, the inclined gutter 25 can be appropriately switched.

Further, the conversion graph is created by actually measuring and plotting the amount of received iron w and the level L of the molten metal during the actual receiving operation. Therefore, unlike the one created by the approximation formula, the molten metal level L ′ obtained by the conversion shows a value substantially equal to the actual molten metal level at that time. Therefore, the actual molten metal level of the hot metal received in the TPC can be accurately detected from the conversion graph, and accordingly, the inclination gutter 25 can be appropriately switched.

In this embodiment, the above-described conversion graph is created for each TPC and for each line. Thereby, each conversion graph becomes an optimal one in which the individual difference of each TPC and each line is reflected. Therefore, by converting the amount of received iron w to the level L ′ of the molten metal using these optimum conversion graphs, the height of the molten metal can be accurately determined from the weight of the received TPC received at each line. And the switching of the inclined gutter 25 can be appropriately performed.

In this embodiment, since the conversion graph is sequentially corrected based on the amount of received iron w and the level L of the molten metal measured at the time of the actual receiving operation, the use state of the TPC is changed. Accordingly, the conversion graph can be optimized, and the TPC can always accurately detect the surface level of the hot metal received by the TPC. Further, in the present embodiment, since this correction is performed in consideration of the use frequency information 7 and the converter actual weighing value 8, the conversion graph can be accurately corrected in accordance with the actual operation state, and The conversion from w to the molten metal level L 'can be performed with higher accuracy.

The weight of the slab discarded in the hot metal pretreatment performed in the process of transporting the hot metal from the blast furnace 21 to the converter 22 was measured, and the weight of the discarded slab and the converter 22 were measured.
May be used as the converter actual weighing value 8 to be given to the conversion graph creation / correction unit 5 with the total weight measured by the weigh scale 29. In this way, the conversion graph can be corrected by giving the converter actual weighing value 8 in a form closer to the actual operation, and the conversion accuracy from the amount of received iron w to the molten metal level L 'can be further improved. be able to.

Next, a second embodiment of the present invention will be described. FIG. 3 is a block diagram showing a functional configuration of the inclined pouring gutter switching device according to the second embodiment of the present invention. In FIG. 3, components denoted by the same reference numerals as those shown in FIG. 1 have the same functions, and detailed description thereof will be omitted.

In FIG. 3, reference numeral 12 denotes a received-iron amount and tapping speed calculation unit, similar to the received-iron amount calculation unit 1 in FIG.
In addition to calculating the actual endowment w in 3,24,
The tapping speed v is calculated based on the time required to obtain the received iron amount w. The tapping speed v calculated here is given to the molten metal level rise speed abnormality monitoring unit 13. Further, the value of the level L detected by the level analyzer 2 is also provided to the level rising speed abnormality monitoring unit 13.

The level rise speed abnormality monitoring unit 13 monitors the current tapping speed v given by the received-iron amount / tapping speed calculation unit 12 and the manner in which the bath level L given by the level analysis unit 2 varies. And if there is a difference between them, TP
It is determined that the forming has occurred in C23 and C24, the fact is notified to the level meter / load cell use switching unit 14, and the operator's cab is notified.

That is, when forming occurs, a lot of foamy slag is generated on the actual molten metal surface. Therefore, when the level is detected by microwave, it is erroneously detected that the molten metal surface is higher than the actual molten metal surface. In some cases. In such a case, as compared with the current tapping speed v given by the received-iron amount / tapping speed calculation unit 12, the manner of variation of the molten metal level L given by the level analysis unit 2 becomes large.
It can be determined that the forming has occurred.

The means for detecting the occurrence of forming is not limited to the above example. For example, a camera or the like may be provided at a position where the inside of the TPCs 23 and 24 can be photographed, and the occurrence of forming may be detected by performing image processing on video data photographed by the camera.

The level meter / load cell use switching unit 14
In response to the notification of the occurrence of the forming from the level rising speed abnormality monitoring unit 13, the use of the microwave level meters 3 and 4 is stopped, and the downspout gutter 2 is used by using the load cells 27 and 28.
A control signal is sent to the inclined gutter switching determination unit 11 so that the switching determination of No. 5 is performed.

That is, in this embodiment, when no forming is occurring, the microwave level meters 3 and 4 are used.
Is used to directly detect the molten metal level L in the TPCs 23 and 24, and the inclined gutter switching determination unit 11 determines whether to switch the inclined gutter 25 in accordance with the molten metal level L. On the other hand, when the occurrence of forming is detected, the received-iron amount w measured by the load cells 27 and 28 is converted into the molten metal level L ′ by the received-iron amount-level conversion processing unit 10, and the converted hot water level L ′ is calculated. In accordance with the surface level L ', the switching of the inclined gutter 25 is determined by the inclined gutter switching determining unit 11.

Since the switching determination by the inclined gutter switching determining section 11 is performed based on the level of the molten metal, the amount of received iron w is indirect information, whereas the level L of molten metal is directly determined. Information. Accordingly, the molten metal level L ′ converted from the amount of received iron w
Takes a value substantially close to the level L directly measured by the microwave level meters 3 and 4, but unless a forming occurs, the measured value of the level L itself is used as a decanting gutter. It is desirable to make 25 switching decisions.

However, once forming occurs, the microwave level meters 3 and 4 cannot measure the correct level of the molten metal. Therefore, in this case, when the switching of the inclined gutter 25 is determined according to the molten metal level L 'converted by the conversion graph based on the amount of received iron w measured by the load cells 27 and 28, when forming occurs in the TPC. However, it is possible to appropriately switch the inclined gutter 25.

As described above, according to the present embodiment, the switching determination of the inclined gutter 25 can be appropriately performed regardless of whether or not the forming has occurred. When no forming has occurred, the microwave level meters 3 and 4 are used to determine the level of the molten metal surface L.
Is directly measured and used for the determination of the switching of the inclined gutter 25, the switching of the inclined gutter 25 can be performed with higher accuracy.

Also, when the forming is not occurring, the conversion graph is corrected by the conversion graph creating / correcting unit 5 using the high-precision molten metal level L actually measured by the microwave level meters 3 and 4. The conversion graph used when forming occurs can be made more suitable for the actual process. This makes it possible to accurately detect the actual molten metal level of the hot metal received in the TPC, and to appropriately switch the inclined pouring gutter 25.

In addition to the occurrence of forming, the cause of the abnormal increase in the rising level of the molten metal level is as follows.
Occupancy may also occur. The term “occupied” refers to a phenomenon in which hot metal lump remains on the inner wall of the TPC without falling. This means that the user can remember the weight of the previous TPC and determine that the occupancy has occurred when the current weight of the TPC becomes heavier than the previous time. In this case, a countermeasure such as issuing a warning of occurrence of occupancy and performing switching manually by the operator without performing automatic switching by the inclined gutter switching determination unit 11 may be considered.

As described above, the inclined gutter switching apparatus of the present embodiment described above uses the CPU or M
PU, RAM, ROM, etc.
This can be realized by operating a program stored in the AM or the ROM. Therefore, a program that causes a computer to perform the above-described functions is stored in, for example, a CD.
-It can be realized by recording in a recording medium such as a ROM and reading it into a computer. As a recording medium, a floppy disk, a hard disk, a magnetic tape, a magneto-optical disk, a nonvolatile memory card, or the like can be used other than the CD-ROM.

Further, not only the functions of the above-described embodiment are realized by the computer executing the supplied program, but also the OS (Operating System) or other application software running the computer on the computer. When the functions of the above-described embodiment are realized in cooperation with the computer, or when all or a part of the processing of the supplied program is performed by a function expansion board or a function expansion unit of a computer, the functions of the above-described embodiment are realized. Such a program is also included in the embodiment of the present invention.

Although the conversion graph is used in each of the above embodiments, it is not always necessary to make the graph state.
For example, a conversion table may be used. In short,
Any form may be used as long as information for converting the amount of received iron w into the level L 'is prepared and held.

In each of the above-described embodiments, a conversion graph is created to convert the amount of received iron w into the level L ′, and the switching of the inclined gutter 25 is determined based on the converted level L ′. However, the weight of the received iron when the molten metal level reaches a certain level which is the switching reference of the inclined gutter 25 is detected and held, and thereafter, the amount of received iron w successively measured is equal to the held iron receiving weight. Tilting gutter 2 by seeing if weight is reached
5 may be determined.

[0062]

As described above, the present invention detects the weight of the hot metal received by the mixed iron wheel and the level of the hot metal received during the actual iron receiving operation, and determines the detected weight of the hot metal and the level of the hot metal. The information indicating the correspondence relationship is created and retained, and based on the weight of the pig iron wheel detected successively during the actual pig ironing operation, the switching determination of the inclined gutter is determined using the above correspondence information. Since it is done, it is possible to judge the switching of the inclined pouring gutter based on the weight of the receiving iron, not the molten metal level itself using the microwave, and even if the forming occurs in the mixed iron car, the inclined pouring gutter Can be appropriately switched.

The conversion information, which is an example of the above-mentioned correspondence information, is created using the pig iron weight and the molten metal level actually measured during the actual pig ironing operation. Differently, the level of the bath surface obtained by the conversion is
It shows a value almost equal to the actual level of the molten metal at that time. Therefore, it is possible to accurately detect the actual level of the molten metal in the mixed iron wheel from the conversion information, and to appropriately switch the inclined gutter.

According to another feature of the present invention, the conversion information is created for each of the mixed-iron cars and each of the tracks, and thus the individual information of each of the mixed-iron cars and each of the tracks is reflected as the conversion information. Thus, it is possible to accurately detect the actual level of the molten metal by the conversion, and appropriately switch the inclined gutter.

According to another feature of the present invention, the conversion graph is sequentially corrected according to the detected receiving weight and the level of the molten metal, so that the degree of wear of the refractory brick in the TPC, such as the degree of abrasion of the refractory brick in the process, may be changed. It is possible to optimize the conversion information in accordance with the use state of each equipment and the like, and it is possible to always accurately detect the level of the hot metal level of the hot metal received by the mixed iron vehicle at each time.

According to another feature of the present invention, when the conversion information is corrected, the conversion information is taken into account by taking into account the number of times the mixed iron wheel has been used and the actual weight of the hot metal actually received from the mixed iron wheel in the converter. Since the correction is performed, more accurate conversion information in a form closer to the actual operation can always be obtained, and the conversion accuracy from the receiving iron weight to the metal surface level can be further improved.

According to another feature of the present invention, depending on whether or not forming has occurred in the mixed iron wheel, which of the detected values of the receiving iron weight and the molten metal level is used to determine whether or not to switch the inclined gutter is determined. In particular, when forming is not occurring, the switching of the decanter gutter is performed using the detected level of the molten metal level, which is the direct information, instead of the iron receiving weight, which is the indirect information. By performing the determination, the inclined gutter can be switched more accurately.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a functional configuration of an inclined gutter switching device for a blast furnace according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an example of a process for transferring hot metal from a blast furnace to a converter.

FIG. 3 is a block diagram showing a functional configuration of an inclined pouring gutter switching device for a blast furnace according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 Receiving amount calculation unit 2 Level analysis unit 3, 4 Microwave level meter 5 Conversion graph creation / correction unit 6 Conversion graph holding unit 7 Usage frequency information 8 Converter actual weighing value 9 Display 10 Receiving amount-level conversion processing unit DESCRIPTION OF REFERENCE NUMERALS 11 Inclined gutter changeover determination unit 12 Accepted amount / tapping speed calculation unit 13 Fluid level rise speed abnormality monitoring unit 14 Level meter / load cell use switching unit 21 Blast furnace 22 Converter 23, 24 TPC (Torpedo car) 25 Inclined gutter 26 Pig iron 27, 28 Load cell 29 Weight scale

Claims (16)

[Claims] When a hot metal spouted from a blast furnace is received by a mixed iron wagon through a tilting gutter, a tilting gutter switching device for a blast furnace that switches the inclination of the tilting gutter according to the degree of acceptance of the mixed iron wagon. In the mixed iron wheel, the amount of received pig iron is detected, the level of the hot metal received by the mixed iron wheel is detected by the level detecting means, and the amount of received iron is detected by the received iron amount detecting means. Correspondence information creating / holding means for creating and holding information indicating a correspondence relationship between the received pig weight and the molten metal level based on the received iron weight and the molten metal level detected by the level detecting means; Based on the weight of the received pig iron detected by the amount of pig iron detection means, comprising: a switching determination means for determining the switching of the inclined gutter using the correspondence information between the received iron weight and the level of the molten metal, Gutter switching device for blast furnace. 2. A tilting gutter switching device for a blast furnace, which switches the inclination of the tilting gutter according to the degree of pig iron receiving of the mixed iron wheel when the hot metal discharged from the blast furnace is received by the mixed iron wheel through the tilting gutter. In the mixed iron wheel, the amount of received pig iron is detected, the level of the hot metal received by the mixed iron wheel is detected by the level detecting means, and the amount of received iron is detected by the received iron amount detecting means. Conversion information creating / holding means for creating and holding information for converting the received iron weight to the molten metal level based on the received iron weight and the molten metal level detected by the level detecting means; and Conversion means for converting the received iron weight detected by the detection means into a molten metal level in accordance with the conversion information; and switching determination means for determining whether to switch the inclined gutter based on the molten metal level converted by the conversion means. Specially equipped Devote gutter switching device of the blast furnace to be. 3. The blast furnace tilting gutter changeover according to claim 2, wherein the conversion information is created for each individual pig iron wheel and each wire line where the iron pig wheel receives iron from the blast furnace. apparatus. 4. Conversion information for sequentially correcting the conversion information created and held by said conversion information creation / holding means based on the weight of the received iron and the level of the molten metal detected by said iron receiving amount detecting means and said level detecting means. The inclined pouring gutter switching device for a blast furnace according to claim 2 or 3, further comprising a correcting means. 5. The blast furnace according to claim 4, wherein the conversion information correction means receives information on the number of times of use of the mixed iron wheel, and corrects the conversion information in consideration of the number of times of use. Slant gutter switching device. 6. The conversion information correction means receives the actual weighed value of the hot metal actually received from the mixed iron wheel in the converter, and corrects the conversion information in consideration of the actual weighed value. The inclined pouring gutter switching device for a blast furnace according to claim 4 or 5, characterized in that: 7. A casting detector for detecting the occurrence of forming in the mixed-iron car, and the tipping method using any of the received-iron-amount detecting means and the level detecting means depending on whether or not the forming has occurred. Use switching means for switching whether to perform gutter switching determination, when the forming has not occurred, perform the switching determination of the inclined gutter using the molten metal level detected by the level detection means, When the forming is occurring, the switching determination of the inclined pouring gutter is performed by using a molten metal level obtained by converting the received-iron weight detected by the received-iron-amount detecting means in accordance with the conversion information. The inclined pouring gutter switching device for a blast furnace according to any one of claims 2 to 6. 8. A tilt-pipe switching device for a blast furnace, which switches the tilt of the tilt-pipe according to the degree of receiving of the mixed-powder wheel when receiving hot metal from a blast furnace through a tilt-pipe. In the mixed iron wheel, the amount of received pig iron is detected, the level of the hot metal received by the mixed iron wheel is detected by the level detecting means, and the amount of received iron is detected by the received iron amount detecting means. Reference information detecting and holding means for detecting and holding the weight of the received iron when the level of the molten metal reaches a predetermined level, based on the weight of the received iron and the level of the molten metal detected by the level detecting means, A blast furnace characterized by comprising: switch determining means for determining whether to switch the inclined gutter according to whether or not the received pig weight detected by the detecting means has reached the held reference pig weight. Slant gutter switching device. 9. A method for switching a tilted gutter of a blast furnace when the hot metal discharged from the blast furnace is received by a mixed iron wagon through a tilted gutter according to a degree of acceptability of the mixed iron wagon. In the actual receiving operation, the weight of the hot metal received by the mixed iron wheel and the level of the hot metal received by the mixed iron wheel are detected, and based on the detected weight and level of the hot metal, And the step of creating and holding conversion information for converting the iron level to the surface level, and during the subsequent actual iron receiving operation, successively detecting the weight of the iron received by the mixed iron wheel and creating the received weight in advance. A step of converting the molten metal level into a molten metal level in accordance with the held conversion information, and determining whether or not the molten metal level converted from the received pig iron weight has reached a certain level; And a step of switching between And a method for switching the inclined gutter of the blast furnace. 10. The blast furnace tilting gutter switching according to claim 9, wherein the conversion information is created for each individual mixed iron wheel and each individual line where the mixed iron wheel receives iron from the blast furnace. Method. 11. The method according to claim 9, further comprising the step of successively correcting the conversion information prepared and stored in advance according to the weight of the received pig iron and the level of the molten metal level detected during the actual pig receiving operation. 11. The method for switching a tilt gutter of a blast furnace according to 10. 12. The method according to claim 11, wherein in the step of correcting the conversion information, the conversion information is corrected in consideration of the number of times the mixed iron wheel is used. 13. The step of correcting the conversion information, wherein the conversion information is corrected in the converter by taking into account the actual weighed value of the hot metal actually received from the mixed iron wheel. Or the method for switching the inclined gutter of the blast furnace according to item 12. 14. A step of detecting the occurrence of forming in the mixed iron wheel, and using the detected value of the receiving iron weight and the level of the molten metal in accordance with the presence or absence of the occurrence of the forming. A step of switching whether or not to perform a switching determination.When the forming has not occurred, the switching determination of the inclined gutter is performed using the detected value of the molten metal level, and when the forming has occurred. The blast furnace according to any one of claims 9 to 13, wherein the inclination of the inclined gutter is determined using a molten metal level obtained by converting the detected value of the received iron weight according to the conversion information. Switching method of inclined gutter. 15. A computer-readable recording medium on which a program for causing a computer to function as each of the means according to claim 1 is recorded. 16. A computer-readable recording medium having recorded thereon a program for causing a computer to execute the processing procedure of the inclined blast furnace gutter switching method according to any one of claims 9 to 14.