JP7073951B2 - Blast furnace monitoring device, blast furnace monitoring method, and blast furnace monitoring program - Google Patents

Description

The present invention relates to a blast furnace monitoring device, a blast furnace monitoring method, and a blast furnace monitoring program.

In the blast furnace, various techniques for monitoring the operating state of the blast furnace, such as monitoring the presence or absence of an operating abnormality and predicting the occurrence of an operating abnormality, are known. For example, in Patent Document 1, the amount of temperature change for each unit time of the stave cooler arranged in the morning glory portion of the blast furnace is acquired over a certain period of time, and based on the probability density function calculated from the acquired amount of temperature change. , A technique for grasping the formation state of deposits in the morning glory part is described. Further, Patent Document 2 describes a technique for evaluating the degree of activation of the core by averaging the standard deviations of temperatures measured by probes inserted from a plurality of locations in the radial direction of the blast furnace. Further, in Patent Documents 3 and 4, based on the standard deviation of the temperature detected by the sensors embedded in the circumferential direction and the height direction of the blast furnace within a certain period of time, the fireproof wall of the blast furnace and the inside of the blast furnace are attached. A technique for detecting the dropout of a kimono is described.

Japanese Unexamined Patent Publication No. 2012-219352 Japanese Unexamined Patent Publication No. 6-25721 Japanese Unexamined Patent Publication No. 4-285105 Japanese Unexamined Patent Publication No. 4-365807

The presence or absence of operational abnormalities such as the stability of the gas flow in the blast furnace is determined by monitoring the shaft pressure, which indicates the gas pressure in the shaft of the blast furnace, and the stave temperature, which indicates the temperature of the stave cooler placed on the furnace wall of the blast furnace. Has been done. However, since the shaft pressure changes in seconds, it is not easy to detect the change, and only about 20 sensors for detecting the shaft pressure are placed in the blast furnace. It is not easy to identify the place of occurrence. On the other hand, since several hundred sensors for detecting the stave temperature are arranged on the furnace wall of the blast furnace, it is possible to identify the place where the operation abnormality occurs by monitoring the stave temperature. However, since the stave temperature has low sensitivity to changes in the gas flow, when monitoring the stave temperature, it may take time from the occurrence of the operation abnormality to the detection of the operation abnormality.

Therefore, an object of the present invention is to provide a blast furnace monitoring device, a blast furnace monitoring method, and a blast furnace monitoring program that can appropriately determine the presence or absence of an operation abnormality in a blast furnace.

The gist of the present invention for solving such a problem is the following blast furnace monitoring device, blast furnace monitoring method, and blast furnace monitoring program.
(1) A stave temperature acquisition unit that acquires a plurality of stave temperatures at regular time intervals for a plurality of stave coolers arranged on the furnace wall of a blast furnace.
A temperature change amount calculation unit that calculates a plurality of temperature change amounts, which are changes in a temperature at a predetermined position on the furnace wall of a blast furnace from a plurality of stave temperatures in a predetermined time interval.
A standard deviation calculation unit that calculates the standard deviation of multiple temperature changes,
The first determination unit that determines whether the standard deviation is equal to or greater than the first threshold value,
A second determination unit that determines whether the standard deviation is less than or equal to the second threshold value, which is smaller than the first threshold value.
An alarm signal output unit that outputs an alarm signal when it is determined that the standard deviation is equal to or greater than the first threshold value and when it is determined that the standard deviation is equal to or less than the second threshold value.
A blast furnace monitoring device characterized by having.
(2) Predetermined positions are a plurality of temperature estimation points arranged in a grid pattern in a two-dimensional plane defined by the circumferential direction and the height direction with respect to the furnace wall of the blast furnace.
The temperature change amount calculation unit is characterized in that it estimates a plurality of temperature change amounts at a plurality of temperature estimation points from an arrangement position in which a stave temperature sensor corresponding to each of a plurality of stave temperatures and a plurality of stave temperatures is arranged. ,
The blast furnace monitoring device according to (1).
(3) Further having a region dividing portion for dividing the temperature change amount into at least two groups according to the region in which the corresponding predetermined position is arranged.
The blast furnace monitoring device according to (1) or (2), wherein the standard deviation calculation unit calculates the standard deviation of the amount of temperature change for each group.
(4) The area division section defines a boundary in the height direction of the blast furnace, and determines the amount of temperature change in the first group in which a predetermined position is located in the area above the boundary and in the area below the boundary. The blast furnace monitoring device according to (3), which is divided into the second group in which the blast furnace is located.
(5) For multiple stave coolers placed on the furnace wall of the blast furnace, multiple stave temperatures are acquired at regular time intervals.
From a plurality of stave temperatures, a plurality of temperature changes, which are changes in the temperature at a predetermined position on the furnace wall of the blast furnace in a predetermined time interval, are calculated.
Calculate the standard deviation of multiple temperature changes,
Determine if the standard deviation is greater than or equal to the first threshold
Determine if the standard deviation is less than or equal to the second threshold, which is smaller than the first threshold.
When it is determined that the standard deviation is equal to or greater than the first threshold value, and when it is determined that the standard deviation is equal to or less than the second threshold value, an alarm signal is output.
A blast furnace monitoring method comprising processing.
(6) For multiple stave coolers placed on the furnace wall of the blast furnace, multiple stave temperatures are acquired at regular time intervals.
From a plurality of stave temperatures, a plurality of temperature changes, which are changes in the temperature at a predetermined position on the furnace wall of the blast furnace in a predetermined time interval, are calculated.
Calculate the standard deviation of multiple temperature changes,
Determine if the standard deviation is greater than or equal to the first threshold
Determine if the standard deviation is less than or equal to the second threshold, which is smaller than the first threshold.
When it is determined that the standard deviation is equal to or greater than the first threshold value, and when it is determined that the standard deviation is equal to or less than the second threshold value, an alarm signal is output.
A blast furnace monitoring program characterized by having a computer perform processing.

In one embodiment, it is possible to appropriately determine the presence or absence of an operation abnormality in the blast furnace.

It is a figure which shows the blast furnace monitoring system which includes the blast furnace monitoring apparatus which concerns on 1st Embodiment. It is a flowchart of the blast furnace monitoring process in which the blast furnace monitoring device shown in FIG. 1 monitors the presence or absence of an operation abnormality of the blast furnace. It is a figure which shows the blast furnace monitoring system which includes the blast furnace monitoring apparatus which concerns on 2nd Embodiment. (A) is a flowchart of the blast furnace monitoring process in which the blast furnace monitoring device shown in FIG. 3 monitors the presence or absence of an operation abnormality of the blast furnace, and (b) is a flowchart showing a more detailed process of the process of S202. (A) is a diagram showing an example of the temperature change amount equivalence line in the two-dimensional plane defined by the circumferential direction and the height direction of the blast furnace calculated by the temperature change amount calculation unit shown in FIG. b) is a diagram showing an example of a temperature estimation point where the temperature change amount is estimated by the temperature change amount estimation unit shown in FIG. It is a figure which shows the blast furnace monitoring system which includes the blast furnace monitoring apparatus which concerns on 3rd Embodiment. FIG. 6 is a flowchart of a blast furnace monitoring process in which the blast furnace monitoring device shown in FIG. 6 monitors the presence or absence of an operation abnormality of the blast furnace. It is a figure which shows the 1st example of the time-dependent change of the standard deviation value of the blast furnace monitored by the blast furnace monitoring apparatus shown in FIG. The first standard deviation is shown, and (b) shows the second standard deviation of the second group in which the temperature estimation point is located in the lower region of the blast furnace. It is a figure which shows the 2nd example of the time-dependent change of the standard deviation value of the blast furnace monitored by the blast furnace monitoring apparatus shown in FIG. The first standard deviation is shown, and (b) shows the second standard deviation of the second group in which the temperature estimation point is located in the lower region of the blast furnace.

The blast furnace monitoring device, the blast furnace monitoring method, and the blast furnace monitoring program will be described with reference to the following drawings. However, the technical scope of the present invention is not limited to those embodiments.

(Outline of the blast furnace monitoring device according to the embodiment)
The blast furnace monitoring device according to the embodiment acquires a plurality of stave temperatures for a plurality of stave coolers arranged on the furnace wall of the blast furnace. Next, the blast furnace monitoring device according to the embodiment calculates a plurality of temperature changes, which are changes in the temperature at a predetermined position of the furnace wall of the blast furnace in a predetermined time interval, from the acquired plurality of stave temperatures. Next, the blast furnace monitoring device according to the embodiment calculates the standard deviation of the calculated plurality of temperature changes. Next, the blast furnace monitoring device according to the embodiment determines whether or not the calculated standard deviation is equal to or greater than the first threshold value, and the calculated standard deviation is smaller than the first threshold value and is equal to or less than the second threshold value. It is determined whether or not it is. Then, the blast furnace monitoring device according to the embodiment is when it is determined that the calculated standard deviation is equal to or greater than the first threshold value and when it is determined that the calculated standard deviation is equal to or less than the second threshold value. , Outputs an alarm signal.

Since the blast furnace monitoring device according to the embodiment determines the presence or absence of an operation abnormality of the blast furnace based on the amount of temperature change in a predetermined time interval calculated from the stave temperature, the sensitivity is higher than that of the determination based on the stave temperature itself. It is possible to determine whether or not there is an abnormality in the operation of the blast furnace. Further, in the blast furnace monitoring device according to the embodiment, since the presence or absence of an operation abnormality of the blast furnace is determined based on the amount of temperature change in a predetermined time interval, the temperature of the cooling water flowing to the stave cooler changes due to the change in air temperature. Even if this is the case, it is possible to accurately determine the presence or absence of an operation abnormality in the blast furnace.

Further, the blast furnace monitoring device according to the embodiment has a heat transfer delay of about several minutes with respect to a change in the gas flow. The determination process becomes easier than when a shaft pressure of about several seconds is used.

Further, since the blast furnace monitoring device according to the embodiment determines the presence or absence of an operation abnormality of the blast furnace based on the standard deviation of the temperature change amount of the stave temperature of several hundreds, the number of parameters used for the determination is minimized. This makes the determination process even easier.

(Configuration and function of the blast furnace monitoring device according to the first embodiment)
FIG. 1 is a diagram showing a blast furnace monitoring system including a blast furnace monitoring device according to the first embodiment.

The blast furnace monitoring system 100 includes a blast furnace monitoring device 1 and a plurality of stave temperature sensors 101 for detecting the temperatures of a plurality of stave coolers arranged throughout the furnace wall of the blast furnace 110. The plurality of stave temperature sensors 101 are connected to the blast furnace monitoring device 1 via a LAN (Local Area Network) 102.

The blast furnace monitoring device 1 according to the embodiment includes a communication unit 11, a storage unit 12, an input unit 13, an output unit 14, and a processing unit 20. The communication unit 11, the storage unit 12, the input unit 13, the output unit 14, and the processing unit 20 are connected to each other via the bus 15. The blast furnace monitoring device 1 determines whether or not the standard deviation calculated from the plurality of stave temperatures is equal to or greater than the first threshold value, and the calculated standard deviation is smaller than the first threshold value and is equal to or less than the second threshold value. It is a monitoring control device that determines whether or not it is.

The communication unit 11 has a wired communication interface circuit such as Ethernet (registered trademark). The communication unit 11 communicates with a plurality of stave temperature sensors 101, a higher-level control device (not shown), and the like via the LAN 102.

The storage unit 12 includes, for example, at least one of a semiconductor storage device, a magnetic tape device, a magnetic disk device, or an optical disk device. The storage unit 12 stores an operating system program, a driver program, an application program, data, and the like used for processing in the processing unit 20. For example, the storage unit 12 stores, as an application program, a blast furnace monitoring program for causing the processing unit 20 to execute a blast furnace monitoring process for monitoring the presence or absence of an operation abnormality of the blast furnace 110. The blast furnace monitoring program may be installed in the storage unit 12 from a computer-readable portable recording medium such as a CD-ROM or a DVD-ROM using a known setup program or the like.

Further, the storage unit 12 stores various data used in the blast furnace monitoring process. Further, the storage unit 12 may temporarily store temporary data related to a predetermined process.

The input unit 13 may be any device as long as data can be input, and is, for example, a touch panel, a keyboard, or the like. An operator (not shown) can input characters, numbers, symbols, etc. using the input unit 13. When operated by the operator, the input unit 13 generates a signal corresponding to the operation. Then, the generated signal is supplied to the processing unit 20 as an instruction of the operator.

The output unit 14 may be any device as long as it can display an image, an image, or the like, and is, for example, a liquid crystal display or an organic EL (Electro-Luminescence) display. The output unit 14 displays a video corresponding to the video data supplied from the processing unit 20, an image corresponding to the image data, and the like. Further, the output unit 14 may be an output device that prints a video, an image, characters, or the like on a display medium such as paper.

The processing unit 20 has one or more processors and peripheral circuits thereof. The processing unit 20 comprehensively controls the overall operation of the blast furnace monitoring device 1, and is, for example, a CPU. The processing unit 20 executes processing based on a program (driver program, operating system program, application program, etc.) stored in the storage unit 12. Further, the processing unit 20 can execute a plurality of programs (application programs and the like) in parallel.

The processing unit 20 includes a stave temperature acquisition unit 21, a temperature change amount calculation unit 22, a standard deviation calculation unit 23, a first determination unit 24, a second determination unit 25, and an alarm signal output unit 26. Each of these parts is a functional module realized by a program executed by the processor included in the processing unit 20. Alternatively, each of these parts may be mounted on the blast furnace monitoring device 1 as firmware.

(Blast furnace monitoring process by the blast furnace monitoring device according to the first embodiment)
FIG. 2 is a flowchart of the blast furnace monitoring process in which the blast furnace monitoring device 1 monitors the presence or absence of an operation abnormality of the blast furnace 110. The blast furnace monitoring process shown in FIG. 2 is mainly executed by the processing unit 20 in cooperation with each element of the blast furnace monitoring device 1 based on the program stored in the storage unit 12 in advance.

First, the stave temperature acquisition unit 21 acquires a plurality of stave temperatures from the stave temperature sensor 101 via the LAN 102 for the plurality of stave coolers arranged on the furnace wall of the blast furnace 110 (S101). There may be a stave cooler in which a plurality of stave temperature sensors 101 are arranged, or a stave cooler in which the stave temperature sensor 101 is not arranged. There is not always a one-to-one correspondence. However, when one stave temperature sensor is arranged for one stave cooler and one stave temperature is acquired, as described later, a plurality of stave temperatures are stored in the storage unit 12 in association with the identification number of the corresponding stave cooler. can do. The stave temperature acquisition unit 21 stores each of the acquired plurality of stave temperatures in the storage unit 12 in association with the arrangement position of the stave temperature sensor 101 or the identification number of the corresponding stave cooler. The stave temperature acquisition unit 21 acquires the stave temperature at regular time intervals, and the time interval may be, for example, 1 second, 1 minute, 5 minutes, or the like.

Next, the temperature change amount calculation unit 22 calculates a plurality of temperature change amounts indicating the change amounts of the plurality of stave temperatures acquired in the process of S101 in each predetermined time interval (S102). The temperature change amount calculation unit 22 sets the stave temperature acquired in the blast furnace monitoring process before the predetermined time interval and the stave temperature acquired in the current furnace monitoring process for each of the plurality of stave temperatures acquired in the process of S101. The amount of temperature change in a predetermined time interval is calculated from the difference between. The temperature change amount calculation unit 22 stores each of the calculated temperature change amounts in the storage unit 12 in association with the arrangement position of the stave temperature sensor 101 or the identification number of the corresponding stave cooler. The predetermined time interval can be constant, and may or may not be the same as the time interval for acquiring the stave temperature, and may be, for example, 1 minute or 5 minutes. Further, in calculating the amount of temperature change, for example, as disclosed in Japanese Patent Application Laid-Open No. 2002-317217, a weighting coefficient considering the degree of influence of the stave temperature can be arbitrarily set, and for example, the strength of forgetting can be set. It can be set using the defined forgetting factor.

Next, the standard deviation calculation unit 23 calculates the standard deviation of the plurality of temperature change amounts calculated in the process of S102 (S103). The standard deviation calculation unit 23 stores the calculated standard deviation in the storage unit 12. The standard deviation calculation unit 23 may store the calculated standard deviation in the storage unit 12 each time the standard deviation is calculated. Further, the standard deviation calculation unit 23 may store the average value of the standard deviations calculated over a certain period in the storage unit 12. For example, the standard deviation calculation unit 23 may store the average value of the standard deviation calculated every 5 minutes for 60 minutes in the storage unit 12.

Next, the first determination unit 24 determines whether or not the standard deviation stored in the storage unit 12 is equal to or greater than the first threshold value (S104). The first threshold value is appropriately determined according to the blast furnace 110 and stored in the storage unit 12. When the first determination unit 24 determines that the standard deviation stored in the storage unit 12 is equal to or greater than the first threshold value (S104-YES), the first operation indicates that the gas flow of the blast furnace 110 has changed. The abnormality flag is stored in the storage unit 12 (S105).

Next, the second determination unit 25 determines whether or not the standard deviation stored in the storage unit 12 is equal to or less than the second threshold value smaller than the first threshold value (S106). Similar to the first threshold value, the second threshold value is appropriately determined according to the blast furnace 110 and stored in the storage unit 12. When the second determination unit 25 determines that the standard deviation stored in the storage unit 12 is equal to or less than the second threshold value (S106-YES), the thickness of the deposits adhering to the furnace wall of the blast furnace 110 becomes thick. The second operation abnormality flag indicating that the fire has occurred is stored in the storage unit 12 (S107).

Next, the alarm signal output unit 26 determines whether or not the first operation abnormality flag is stored in the storage unit 12 (S108). When the alarm signal output unit 26 determines that the first operation abnormality flag is stored in the storage unit 12 (S108-YES), the alarm signal output unit 26 outputs a first alarm signal indicating that the gas flow of the blast furnace 110 has changed. (S109).

Next, the alarm signal output unit 26 determines whether or not the second operation abnormality flag is stored in the storage unit 12 (S110). When the alarm signal output unit 26 determines that the second operation abnormality flag is stored in the storage unit 12 (S110-YES), the alarm signal output unit 26 determines that the thickness of the deposits adhering to the furnace wall of the blast furnace 110 has increased. The second alarm signal shown is output (S111).

(Operational effect of the blast furnace monitoring device according to the first embodiment)
Since the blast furnace monitoring device 1 determines the presence or absence of an operation abnormality of the blast furnace 110 based on the temperature change amount calculated from the stave temperature, the presence or absence of an operation abnormality of the blast furnace is more sensitive than the case of determining based on the stave temperature itself. It can be determined. Further, since the blast furnace monitoring device 1 determines the presence or absence of an operation abnormality of the blast furnace based on the temperature change amount calculated from the stave temperature, even if the temperature of the stave cooler changes due to the change due to the air temperature or the like, the temperature of the blast furnace is accurately changed. It is possible to determine whether or not there is an operation abnormality in the blast furnace 110.

Further, the blast furnace monitoring device 1 determines whether or not there is an operation abnormality of the blast furnace based on the amount of temperature change of the stave temperature, which has a heat transfer delay of about several minutes with respect to the change of gas flow, so that the transfer delay is about several seconds. The determination process becomes easier than when the shaft pressure is used.

Further, the blast furnace monitoring device 1 determines the presence or absence of an operation abnormality of the blast furnace based on the standard deviation of the amount of temperature change in a predetermined time interval of hundreds of stave temperatures, so that the number of parameters used for the determination is minimized. By limiting the limit, the determination process becomes easier.

Further, the blast furnace monitoring device 1 indicates that the operation abnormality has occurred when the variation in the amount of change in the stave temperature increases due to the operation abnormality and the standard deviation calculated from the stave temperature becomes equal to or higher than the first threshold value. The indicated alarm signal is output. The blast furnace monitoring device 1 can notify the operator that a change in the gas flow has occurred by outputting a first alarm signal when the standard deviation becomes equal to or higher than the first threshold value.

Further, the blast furnace monitoring device 1 indicates that the operation abnormality has occurred when the variation in the amount of change in the stave temperature is reduced due to the operation abnormality and the standard deviation calculated from the stave temperature becomes equal to or less than the second threshold value. The indicated alarm signal is output. The blast furnace monitoring device 1 outputs an alarm signal in response to the standard deviation becoming equal to or less than the second threshold value, so that the thickness of the deposits adhering to the furnace wall of the blast furnace 110 has increased to the operator. Can be notified.

(Configuration and function of the blast furnace monitoring device according to the second embodiment)
FIG. 3 is a diagram showing a blast furnace monitoring system including the blast furnace monitoring device according to the second embodiment.

The blast furnace monitoring system 200 differs from the blast furnace monitoring system 100 in that the blast furnace monitoring device 2 is arranged in place of the blast furnace monitoring device 1. The blast furnace monitoring device 2 differs from the blast furnace monitoring device 1 in that the processing unit 30 is provided in place of the processing unit 20. The processing unit 30 is different from the processing unit 20 in that the processing unit 30 has a temperature change amount calculation unit 32 instead of the temperature change amount calculation unit 22. Since the components and functions of the blast furnace monitoring system 200 other than the temperature change amount calculation unit 32 are the same as the components and functions of the blast furnace monitoring system 100 having the same reference numerals, detailed description thereof will be omitted here. .. The temperature change amount calculation unit 32 includes a stave temperature change amount calculation unit 321 and a temperature change amount estimation unit 322.

(Blast furnace monitoring process by the blast furnace monitoring device according to the second embodiment)
FIG. 4A is a flowchart of the blast furnace monitoring process in which the blast furnace monitoring device 2 monitors the presence or absence of an operation abnormality of the blast furnace 110, and FIG. 4B is a flowchart showing a more detailed process of the process of S202. The blast furnace monitoring process shown in FIG. 4A is mainly executed by the processing unit 30 in cooperation with each element of the blast furnace monitoring device 2 based on the program stored in the storage unit 12 in advance.

Since the processes of S201 and S203 to S211 are the same as the processes of S101 and S103 to S111, detailed description thereof will be omitted here. The temperature change amount calculation unit 32 calculates a plurality of temperature change amounts, which are changes in the temperature at a predetermined position on the furnace wall of the blast furnace in a predetermined time interval, from the plurality of stave temperatures acquired in the process of S201 (. S202).

More specifically, the stave temperature change amount calculation unit 321 calculates the stave temperature change amount indicating the change amount of the plurality of stave temperatures in each predetermined time interval. Then, the temperature change amount estimation unit 322 grids the furnace wall of the blast furnace 110 in a two-dimensional plane defined by the circumferential direction and the height direction from the calculated stave temperature change amount and the arrangement position of the stave temperature sensor 101. Estimate the amount of temperature change at multiple temperature estimation points arranged in a shape.

Specifically, the stave temperature change amount calculation unit 321 calculates a stave temperature change amount indicating a change amount of each of the plurality of stave temperatures acquired in the process of S201 in a predetermined time interval (S301). The stave temperature change amount calculation unit 321 has the stave temperature acquired in the blast furnace monitoring process before a predetermined time interval and the stave temperature acquired in the current blast furnace monitoring process for each of the plurality of stave temperatures acquired in the process of S201. The difference from and is calculated as the amount of temperature change in a predetermined time interval. The stave temperature change amount calculation unit 321 stores each of the calculated temperature change amounts in the storage unit 12 in association with the arrangement position of the stave temperature sensor 101 or the identification number of the corresponding stave cooler.

Next, the temperature change amount estimation unit 322 calculates the contour line of the temperature change amount in the two-dimensional plane defined by the circumferential direction and the height direction for the furnace wall of the blast furnace 110 (S302). The temperature change amount estimation unit 322 is a temperature change amount in the two-dimensional plane from the arrangement position of the stave temperature sensor 101 corresponding to each of the stave temperature change amount calculated in the process of S301 and the calculated stave temperature change amount. Calculate the contour line of. The temperature change amount estimation unit 322 can calculate the contour line by, for example, the contour line search method described in JP-A-2002-194405 and JP-A-2002-317217.

FIG. 5A is a diagram showing an example of the temperature change amount equivalence line in the two-dimensional plane defined by the circumferential direction and the height direction for the furnace wall of the blast furnace 110 calculated by the temperature change amount estimation unit 322. Is. In FIG. 5A, the horizontal axis indicates the circumferential direction of the blast furnace 110, and the vertical axis indicates the height direction of the blast furnace 110.

Next, the temperature change amount estimation unit 322 estimates the temperature change amount at a plurality of temperature estimation points arranged in a grid pattern in a two-dimensional plane defined by the circumferential direction and the height direction for the furnace wall of the blast furnace 110 (. S303). The temperature change amount estimation unit 322 estimates, for example, the temperature change amount at the temperature estimation points arranged in a 14 × 14 grid arranged at the same distance in the circumferential direction and the height direction of the blast furnace 110. The temperature change amount estimation unit 322 estimates the temperature change amount at the temperature estimation point from the positional relationship between the contour line calculated by the processing of S302 and the temperature estimation point. The temperature change amount estimation unit 322 estimates the temperature change amount at the temperature estimation point by a known interpolation method such as polynomial interpolation or spline interpolation.

FIG. 5B is a diagram showing an example of a temperature estimation point where the temperature change amount is estimated by the temperature change amount estimation unit 322. In FIG. 5B, the horizontal axis indicates the circumferential direction of the blast furnace 110, and the vertical axis indicates the height direction of the blast furnace 110. In FIG. 5B, the temperature estimation points are indicated by white circles arranged at the intersections of the broken lines extending in the circumferential direction and the height direction of the blast furnace, respectively. In FIG. 5B, the temperature estimation points are arranged in a 14 × 14 grid pattern.

(Operational effect of the blast furnace monitoring device according to the second embodiment)
Since the blast furnace monitoring device 2 uses the temperature change amount of the temperature estimation points arranged in a grid pattern in the two-dimensional plane defined by the circumferential direction and the height direction for the furnace wall of the blast furnace 110, the stave temperature is detected. Even when the sensor (stage temperature sensor 101) is unevenly distributed, it is possible to accurately determine the presence or absence of an operation abnormality in the blast furnace 110.

The blast furnace monitoring device 2 uses the temperature change amount of the temperature estimation points arranged at equal intervals in a grid pattern in the two-dimensional plane, so that the physical quantity such as the temperature change amount is not set as a value peculiar to each blast furnace. It can be used as a normalized value that does not depend on the blast furnace. Since the blast furnace monitoring device 2 can use physical quantities such as the amount of temperature change as normalized values, for example, the first threshold value and the second threshold value used for determining the presence or absence of an operation abnormality depend on the blast furnace. Can be used as a threshold value.

Further, the blast furnace monitoring device 2 facilitates the region division described later by using the amount of temperature change of the temperature estimation points arranged at equal intervals in a two-dimensional plane in a grid pattern, that is, the temperature estimation points are Since it is arranged regularly, it is easy to set a boundary line so that the temperature estimation points do not get on.

In the second embodiment, the temperature change amount calculation unit 32 has a stave temperature change amount calculation unit 321 and a temperature change amount estimation unit 322, and the temperature change amount estimation unit 322 has a stave temperature change amount calculation unit 321. Has explained that the temperature change amount at the temperature estimation point is estimated from the stave temperature change amount calculated by the above and the arrangement position of the stave temperature sensor 101, but the configuration and function of the temperature change amount calculation unit 32 are not limited to this. .. For example, the temperature change amount calculation unit 32 has a temperature estimation unit and a temperature change amount estimation unit, estimates the temperature at the temperature estimation point by calculating the temperature contour line from the stave temperature, and estimates the temperature from the estimated value. The amount of temperature change at the temperature estimation point may be estimated.

(Configuration and function of the blast furnace monitoring device according to the third embodiment)
FIG. 6 is a diagram showing a blast furnace monitoring system including the blast furnace monitoring device according to the third embodiment.

The blast furnace monitoring system 300 differs from the blast furnace monitoring system 200 in that the blast furnace monitoring device 3 is arranged in place of the blast furnace monitoring device 2. The blast furnace monitoring device 3 differs from the blast furnace monitoring device 2 in that the processing unit 40 is provided in place of the processing unit 30. The processing unit 40 includes the standard deviation calculation unit 43, the first determination unit 44, the second determination unit 45, and the alarm signal output unit 46 in the standard deviation calculation unit 23, the first determination unit 24, the second determination unit 25, and the alarm signal output. It is different from the processing unit 30 in that it has instead of the unit 26. Further, the processing unit 40 is different from the processing unit 30 in that it has a region dividing unit 47. The components and functions of the blast furnace monitoring system 300 other than the standard deviation calculation unit 43 to the area division unit 47 are the same as the components and functions of the blast furnace monitoring system 200 having the same reference numerals. The explanation is omitted.

(Blast furnace monitoring process by the blast furnace monitoring device according to the third embodiment)
FIG. 7 is a flowchart of the blast furnace monitoring process in which the blast furnace monitoring device 3 monitors the presence or absence of an operation abnormality of the blast furnace 110. The blast furnace monitoring process shown in FIG. 7 is mainly executed by the processing unit 40 in cooperation with each element of the blast furnace monitoring device 3 based on the program stored in the storage unit 12 in advance.

Since the processing of S401 to S402 is the same as the processing of S201 to S202, detailed description thereof will be omitted here. The region dividing portion 47 defines a boundary in the height direction of the blast furnace, and the upper side and the lower side of the blast furnace 110 are defined by the boundary. Then, the region dividing unit 47 applies the temperature change amount calculated by the temperature change amount calculation unit 32 to the first group in which the temperature estimation point is located in the upper region of the blast furnace 110 and the temperature in the lower region of the blast furnace 110. It is divided into the second group in which the estimated point is located (S403). For example, when the upper end of the bosh part (fire belly part) is used as a boundary, the amount of temperature change in which the temperature estimation point is located on the shaft part (heart chest part) is included in the first group, and the bosh part (heart part) and the belly part (belly part). The amount of temperature change in which the temperature estimation point is located in the morning glory part) is included in the second group. Further, for example, when the temperature estimation points are arranged in a grid pattern of 14 × 14, the amount of temperature change in which the temperature estimation points are located in the 8th to 14th rows from the bottom in the height direction of the blast furnace 110 is in the first group. The second group includes the amount of temperature change in which the temperature estimation point is located in the first to seventh rows from the bottom in the height direction of the blast furnace 110. Furthermore, the boundary may be set based on the height of the expected fusion zone, and in a blast furnace in which a cast iron stave and a copper stave are used together, the boundary is set at a height at which the stave structure changes. May be good.

Next, the standard deviation calculation unit 43 calculates the first standard deviation indicating the standard deviation of the amount of temperature change divided into the first group by the processing of S403, and the temperature change divided into the second group by the processing of S403. Calculate the second standard deviation, which indicates the standard deviation of the quantity (S404). The standard deviation calculation unit 43 stores the calculated first standard deviation and the second standard deviation in the storage unit 12.

Next, the first determination unit 44 determines whether or not the first standard deviation stored in the storage unit 12 is equal to or greater than the first threshold value (S405). The first threshold value is appropriately determined according to the blast furnace 110 and stored in the storage unit 12. When the first determination unit 44 determines that the first standard deviation stored in the storage unit 12 is equal to or greater than the first threshold value (S405-YES), the first determination unit 44 determines that the gas flow on the upper side of the blast furnace 110 has changed. The first operation abnormality flag to be shown is stored in the storage unit 12 (S406).

Next, the second determination unit 45 determines whether or not the first standard deviation stored in the storage unit 12 is equal to or less than the second threshold value smaller than the first threshold value (S407). Similar to the first threshold value, the second threshold value is appropriately determined according to the blast furnace 110 and stored in the storage unit 12. When the second determination unit 45 determines that the first standard deviation stored in the storage unit 12 is equal to or less than the second threshold value (S407-YES), the second determination unit 45 determines that the deposits attached to the upper furnace wall of the blast furnace 110 are attached. The second operation abnormality flag indicating that the thickness has increased is stored in the storage unit 12 (S408).

Next, the first determination unit 44 determines whether or not the second standard deviation stored in the storage unit 12 is equal to or greater than the first threshold value (S409). When the first determination unit 44 determines that the second standard deviation stored in the storage unit 12 is equal to or greater than the first threshold value (S409-YES), the gas flow under the blast furnace 110 has changed. The third operation abnormality flag indicating the above is stored in the storage unit 12 (S410).

Next, the second determination unit 45 determines whether or not the second standard deviation stored in the storage unit 12 is equal to or less than the second threshold value (S411). When the second determination unit 45 determines that the second standard deviation stored in the storage unit 12 is equal to or less than the second threshold value (S411-YES), the deposit attached to the lower furnace wall of the blast furnace 110 The fourth operation abnormality flag indicating that the thickness of the fire is thickened is stored in the storage unit 12 (S412).

Next, the alarm signal output unit 46 determines whether or not the first operation abnormality flag is stored in the storage unit 12 (S413). When the alarm signal output unit 46 determines that the first operation abnormality flag is stored in the storage unit 12 (413-YES), the alarm signal output unit 46 outputs a first alarm signal indicating that the gas flow on the upper side of the blast furnace 110 has changed. Output (S414).

Next, the alarm signal output unit 46 determines whether or not the second operation abnormality flag is stored in the storage unit 12 (S415). When the alarm signal output unit 46 determines that the second operation abnormality flag is stored in the storage unit 12 (S415-YES), the thickness of the deposits adhering to the furnace wall on the upper side of the blast furnace 110 becomes thicker. A second alarm signal indicating that is output (S416).

Next, the alarm signal output unit 46 determines whether or not the third operation abnormality flag is stored in the storage unit 12 (S417). When the alarm signal output unit 46 determines that the third operation abnormality flag is stored in the storage unit 12 (417-YES), the third alarm signal indicating that the gas flow under the blast furnace 110 has changed has changed. Is output (S418).

Next, the alarm signal output unit 46 determines whether or not the fourth operation abnormality flag is stored in the storage unit 12 (S419). When the alarm signal output unit 46 determines that the fourth operation abnormality flag is stored in the storage unit 12 (S419-YES), the thickness of the deposits adhering to the furnace wall below the blast furnace 110 becomes thicker. A fourth alarm signal indicating that is output (S420).

(Operational effect of the blast furnace monitoring device according to the third embodiment)
The blast furnace monitoring device 3 divides the amount of temperature change into a first group in which the temperature estimation point is located in the upper region of the blast furnace 110 and a second group in which the temperature estimation point is located in the lower region of the blast furnace 110. Since the determination process is executed for each group, it is possible to improve the determination sensitivity of the operation abnormality. For example, since the deposits adhering to the blast furnace 110 are more likely to adhere to the lower side of the blast furnace 110, the operation abnormality is determined based on the amount of temperature change included in the second group located in the lower region of the blast furnace 110. By doing so, the influence of the first group located in the upper region of the blast furnace 110 can be eliminated.

FIG. 8 is a diagram showing a first example of a change over time in the standard deviation value of the blast furnace 110 monitored by the blast furnace monitoring device 3. FIG. 8 (a) shows the first standard deviation of the first group in which the temperature estimation point is located in the upper region of the blast furnace 110, and FIG. 8 (b) shows the temperature estimation point in the lower region of the blast furnace 110. The second standard deviation of the second group is shown. In FIGS. 8 (a) and 8 (b), the horizontal axis shows the time in units of days, and the vertical axis shows the standard deviation calculated by the blast furnace monitoring device 3.

From the 1st day to the 4th day, both the 1st standard deviation and the 2nd standard deviation are transitioning between the 1st threshold value and the 2nd threshold value, and the operating state of the blast furnace 110 is stable. ing. On the fifth day, both the first standard deviation and the second standard deviation were above the first threshold, indicating that both the upper and lower gas flows of the blast furnace 110 had changed. On the 5th day, the workers and the like increase the reducing agent ratio of the blast furnace 110 and decrease the amount of air blown so that both the first standard deviation and the second standard deviation are the first threshold value and the second threshold value. Returning to the value, the operating condition of the blast furnace 110 once stabilized.

However, on the 7th day, both the 1st standard deviation and the 2nd standard deviation became equal to or higher than the 1st threshold value due to the rapid thermal modulation, and the state of abnormal operation continued for 6 days thereafter. On the 17th day, both the 1st standard deviation and the 2nd standard deviation returned between the 1st threshold and the 2nd threshold, and the operating condition of the blast furnace 110 became stable.

FIG. 9 is a diagram showing a second example of the change over time in the standard deviation value of the blast furnace 110 monitored by the blast furnace monitoring device 3. FIG. 9 (a) shows the first standard deviation of the first group in which the temperature estimation point is located in the upper region of the blast furnace 110, and FIG. 9 (b) shows the temperature estimation point in the lower region of the blast furnace 110. The second standard deviation of the second group is shown. In FIGS. 9 (a) and 9 (b), the horizontal axis shows the time in units of days, and the vertical axis shows the standard deviation calculated by the blast furnace monitoring device 3.

From the 1st day to the 3rd day, both the 1st standard deviation and the 2nd standard deviation are transitioning between the 1st threshold value and the 2nd threshold value, and the operating state of the blast furnace 110 is stable. ing. On the fourth day, the second standard deviation is below the second threshold, indicating that the thickness of the deposits on the lower furnace wall of the blast furnace 110 has increased.

On the 8th day, both the first standard deviation and the second standard deviation became equal to or higher than the first threshold value due to the dropping of the deposits adhering to the furnace wall of the blast furnace 110, and both the upper side and the lower side of the blast furnace 110. It is shown that the gas flow of the blast furnace has changed. After that, the state of abnormal operation continued for 4 to 5 days. By increasing the reducing agent ratio of the blast furnace 110 and reducing the amount of air blown, on the 14th day, both the first standard deviation and the second standard deviation are between the first threshold and the second threshold. After returning, the operating condition of the blast furnace 110 became stable.

(Modification example of the blast furnace monitoring device according to the embodiment)
The blast furnace monitoring devices 1 to 3 output an alarm signal when the standard deviation of the temperature change amount becomes equal to or more than the first threshold value and when the standard deviation of the temperature change amount becomes equal to or less than the second threshold value. .. However, in the blast furnace monitoring device according to the embodiment, the period in which the standard deviation of the temperature change amount becomes the first threshold value or more and the period in which the standard deviation of the temperature change amount becomes the second threshold value or less are predetermined. An alarm signal may be output when the threshold period of is reached. The threshold period for outputting the alarm signal may be, for example, several hours or several days.

1 Blast furnace monitoring device 21 Stave temperature acquisition unit 22, 32 Temperature change amount calculation unit 23, 43 Standard deviation calculation unit 24, 44 First judgment unit 25, 45 Second judgment unit 26, 46 Alarm signal output unit 47 Area division unit

Claims (5)

A stave temperature acquisition unit that acquires multiple stave temperatures at regular time intervals for multiple stave coolers placed on the furnace wall of the blast furnace.
A temperature change amount calculation unit that calculates a plurality of temperature change amounts, which are changes in a temperature at a predetermined position on the furnace wall of the blast furnace in a predetermined time interval, from the plurality of stave temperatures.
A region division portion that divides the temperature change amount into at least two groups according to a region in which a corresponding predetermined position is arranged, and a region division portion.
A standard deviation calculation unit that calculates the standard deviation of the plurality of temperature changes for each group ,
A first determination unit that determines whether or not the standard deviation is equal to or greater than the first threshold value.
A second determination unit that determines whether or not the standard deviation is less than or equal to the second threshold value that is smaller than the first threshold value.
An alarm signal output unit that outputs an alarm signal when it is determined that the standard deviation is equal to or greater than the first threshold value, and when it is determined that the standard deviation is equal to or less than the second threshold value.
A blast furnace monitoring device characterized by having. The predetermined positions are a plurality of temperature estimation points arranged in a grid pattern in a two-dimensional plane defined by the circumferential direction and the height direction with respect to the furnace wall of the blast furnace.
The temperature change amount calculation unit estimates a plurality of temperature change amounts at a plurality of temperature estimation points from an arrangement position in which a plurality of stave temperatures and stave temperature sensors corresponding to each of the plurality of stave temperatures are arranged. Item 1. The blast furnace monitoring device according to Item 1. The region division portion defines a boundary in the height direction of the blast furnace, and the temperature change amount is applied to the first group in which the predetermined position is located in the region above the boundary and the region below the boundary. The blast furnace monitoring device according to claim 1 or 2 , which is divided into a second group in which a predetermined position is located. For multiple stave coolers placed on the furnace wall of the blast furnace, multiple stave temperatures are acquired at regular time intervals, and
From the plurality of stave temperatures, a plurality of temperature changes, which are changes in the temperature at a predetermined position on the furnace wall of the blast furnace in a predetermined time interval, are calculated.
The amount of temperature change is divided into at least two groups according to the region where the corresponding predetermined positions are arranged.
The standard deviation of the plurality of temperature changes is calculated for each group, and the standard deviation is calculated.
It is determined whether or not the standard deviation is equal to or greater than the first threshold value.
It is determined whether or not the standard deviation is equal to or less than the second threshold value smaller than the first threshold value.
When it is determined that the standard deviation is equal to or greater than the first threshold value, and when it is determined that the standard deviation is equal to or less than the second threshold value, an alarm signal is output.
A blast furnace monitoring method comprising processing. For multiple stave coolers placed on the furnace wall of the blast furnace, multiple stave temperatures are acquired at regular time intervals, and
From the plurality of stave temperatures, a plurality of temperature changes, which are changes in the temperature at a predetermined position on the furnace wall of the blast furnace in a predetermined time interval, are calculated.
The amount of temperature change is divided into at least two groups according to the region where the corresponding predetermined positions are arranged.
The standard deviation of the plurality of temperature changes is calculated for each group, and the standard deviation is calculated.
It is determined whether or not the standard deviation is equal to or greater than the first threshold value.
It is determined whether or not the standard deviation is equal to or less than the second threshold value smaller than the first threshold value.
When it is determined that the standard deviation is equal to or greater than the first threshold value, and when it is determined that the standard deviation is equal to or less than the second threshold value, an alarm signal is output.
A blast furnace monitoring program characterized by having a computer perform processing.

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