TWI700372B - Blast furnace facility and monitoring method for liquid level of slag of blast furnace - Google Patents

Abstract

A blast furnace facility includes a blast furnace and a monitoring system. The blast furnace includes a furnace wall, tuyeres and tap holes. The furnace wall defines a containing space to contain hot metal and slag located above the hot metal. The furnace wall includes a furnace shell. The tuyeres pass through the furnace shell and communicate with the containing space. The tap holes pass through the furnace wall and communicate with hot metal. The monitoring system includes a strain gauge and a processing module. The strain gauge is disposed on the furnace shell, and the installation location of the strain gauge is lower than that of the tuyeres. When the blast furnace is applied to an ironmaking operation, the strain gauge obtains strain information of the furnace shell. The processing module is coupled with the strain gauge to receive the strain information, and is configured to compute the liquid level of the slag of the blast furnace.

Description

Blast furnace equipment and monitoring method of blast furnace slag level

The disclosed embodiment relates to a blast furnace equipment, and in particular to a blast furnace equipment and a method for monitoring the blast furnace slag level.

Blast furnace is a kind of ironmaking facility and the most economical ironmaking method at present. In the ironmaking process, the ironmaking raw materials are added from the top of the blast furnace, and under the action of the reducing gas rising in the furnace, the raw materials turn into a molten state and drip down, and finally a large amount of molten iron and slag will accumulate at the hearth.

A blast furnace usually has more than 2 tap holes. In the tapping operation, a hole is partially drilled at a tap hole to make the molten iron and slag flow out. When the slag liquid level drops so that the furnace gas is discharged from the tap hole and the slag splashes out, it means that the slag liquid level has dropped to the lowest point. At this time, no more tapping is possible, that is, the tapping of the tap hole is completed. After that, the hole is pressed tightly with a mud plugger, and the refractory plugging material is squeezed in by hydraulic pressure to close the taphole. Simultaneously or after closing the tap hole, repeat the tapping action of tapping the hole and stopping the hole for another tap hole, and so on. The best tapping operation is to maintain the slag level at a stable height, and the lower the height, the better.

When the slag liquid level rises, in addition to affecting the airflow distribution in the furnace, it will also increase buoyancy, which in turn will slow down the rate of raw material decline and reduce the output of molten iron. What's more serious is that if the slag liquid level rises to the tuyere, it will not be able to supply air for production, and there is even a risk of missing milling. Therefore, according to the level of the furnace slag (liquid surface height), determining the best tapping, mud plugging timing and hole size, and controlling the liquid level in an appropriate range is one of the key technologies for stable ironmaking in blast furnaces.

The purpose of this disclosure is to provide a monitoring method for blast furnace equipment and blast furnace slag level, which can monitor the blast furnace slag level to help judge the timing of iron tapping and mud blocking, and stabilize the blast furnace tapping operation.

According to the above-mentioned objective of the present disclosure, a blast furnace equipment including a blast furnace and a monitoring system is proposed. The blast furnace has a furnace wall, a blast nozzle and a tap hole. The furnace wall defines a containing space for containing molten iron and slag on the molten iron. The furnace wall contains the furnace shell. The blast nozzle penetrates the furnace wall and communicates with the accommodating space. The tap hole penetrates the furnace wall and communicates with the molten iron. The monitoring system includes strain gauges and processing modules. The strain gauge is arranged on the furnace shell, and the strain gauge is arranged under the tuyere. When the blast furnace is performing ironmaking operations, the strain gauge obtains the strain information of the furnace shell. The processing module is coupled with the strain gauge to receive strain information, and the strain information can be used to calculate the slag level of the blast furnace.

In some embodiments, the strain gauge is provided above the tap hole.

In some embodiments, the installation position of the strain gauge is between the bottom of the molten iron and the liquid level of the slag.

In some embodiments, the processing module includes a receiving unit and a filtering unit. The receiving unit is coupled with the strain gauge to receive strain information. The filter unit is coupled to the receiving unit and is configured to filter out noise of strain information or stress change noise of strain information, so as to extract circumferential stress changes of the furnace shell.

In some embodiments, the processing module calculates the level of the slag in the blast furnace by using a relational formula. The relational formula is △h=△σ*t/(α*ρ*g*r), and △h is the change of the slag level. △σ is the circumferential stress change of the furnace shell, t is the thickness of the furnace shell, α is the stress ratio of the lateral pressure in the furnace wall acting on the furnace wall to the inner wall of the furnace shell, ρ is the average density of the slag , G is the acceleration of gravity, r is the inner diameter of the furnace shell.

According to the above objective of the present disclosure, another method for monitoring the slag level of a blast furnace is proposed. The blast furnace includes a furnace wall, a tuyere, and a tap hole. The furnace wall defines an accommodation space for containing molten iron and is located on the molten iron For the slag, the furnace wall includes the furnace shell, the blast nozzle penetrates the furnace wall and communicates with the accommodating space, and the tap hole penetrates the furnace wall and communicates with the molten iron. The monitoring method includes: installing a strain gauge on the furnace shell and making the setting position of the strain gauge lower than the setting position of the tuyere; when the blast furnace is performing ironmaking operations, the strain gauge obtains the strain information of the furnace shell; and using the strain information Calculate the slag level of the blast furnace.

In some embodiments, calculating the liquid level of the slag of the blast furnace by using the strain information includes: filtering the noise of the strain information or the noise of the stress change of the strain information using a filter unit to extract the circumferential stress change of the furnace shell.

In some embodiments, using strain information to calculate the slag level of the blast furnace includes: calculating the level of the slag in the blast furnace using a relational formula, the relational formula being △h=△σ*t/(α*ρ*g*r), △h is the level change of slag, △σ is The circumferential stress change of the furnace shell, t is the thickness of the furnace shell, α is the stress ratio of the lateral pressure in the furnace wall acting on the furnace wall to the inner wall of the furnace shell, ρ is the average density of the slag, g is The acceleration of gravity, r is the inner diameter of the furnace shell.

In some embodiments, arranging the strain gauge on the furnace shell includes: arranging the strain gauge above the tap hole.

In some embodiments, installing a strain gauge on the furnace shell includes: installing the strain gauge between the bottom of the molten iron and the liquid level of the slag.

In summary, this disclosure proposes a method for monitoring blast furnace equipment and blast furnace slag level. By installing a strain gauge on the blast furnace shell, the strain information of the furnace shell can be used to monitor the slag level in the blast furnace. It achieves multiple functions, such as directly monitoring the level of slag at the hearth, providing on-site determination of the best tapping timing, clogging timing and opening size, and controlling the molten iron level within an appropriate range. In this way, the blast furnace equipment and the monitoring system thereof, and the blast furnace slag level monitoring method disclosed in the present disclosure can monitor the blast furnace slag level to help determine the timing of tapping and mud blocking, and stabilize the tapping operation of the blast furnace.

In order to make the above-mentioned features and advantages of the present disclosure more obvious and understandable, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

1‧‧‧Blast furnace equipment

10‧‧‧Blast furnace

11‧‧‧furnace wall

111‧‧‧ Furnace shell

112‧‧‧Refractory

12‧‧‧Blow mouth

13‧‧‧Take Outlet

2‧‧‧Monitoring system

20‧‧‧Monitoring System

21‧‧‧Strain gauge

22‧‧‧Processing Module

221‧‧‧Receiving unit

222‧‧‧Filter unit

223‧‧‧Computer unit

224‧‧‧Notification Unit

31‧‧‧Molten Iron

311‧‧‧Bottom

32‧‧‧Slag

321‧‧‧Liquid level

H‧‧‧Hollow part

S01, S02, S03‧‧‧Step

From the following detailed description in conjunction with the accompanying drawings, a better understanding of the aspect of the disclosure can be obtained. It should be noted that, according to industry standard practices, each feature is not drawn to scale. In fact, in order to make the discussion clearer, the size of each feature can be increased or decreased arbitrarily.

[Figure 1] is a schematic diagram of a blast furnace equipment according to an embodiment of the disclosure.

[Figure 2] is a functional block diagram of a blast furnace slag level monitoring system according to an embodiment of the disclosure.

[Figure 3] is a chart of the slag liquid level calculated by the two strain gauges in the embodiment of the disclosure and the history of the iron tapping operation of the three tap holes.

[Figure 4] is a flowchart of a method for monitoring the slag level of a blast furnace according to an embodiment of the disclosure.

The embodiments of the present disclosure are discussed in detail below. However, it can be understood that the embodiments provide many applicable concepts, which can be implemented in various specific contents. The discussed and disclosed embodiments are for illustration only, and are not intended to limit the scope of the disclosure. All the embodiments of the present disclosure disclose multiple different features, but these features can be implemented separately or in combination according to requirements. In addition, the "first", "second", ... etc. used in this text do not particularly refer to the meaning of order or sequence, but only to distinguish elements or operations described in the same technical terms. In addition, the spatial relationship between the two elements described in this disclosure is not only applicable to the orientation shown in the diagram, but also applicable to the orientation not shown in the diagram, such as the inverted orientation.

FIG. 1 is a schematic diagram of a blast furnace equipment 1 according to an embodiment of the disclosure. As shown in FIG. 1, the blast furnace equipment 1 includes a blast furnace 10 and a monitoring system 20. The blast furnace 10 is used for ironmaking operations, and the monitoring system 20 is used for monitoring the liquid level of the slag 32 of the blast furnace 10.

The blast furnace 10 includes a furnace wall 11, a blast nozzle 12 and a plurality of tap holes 13. In this embodiment, 32 blowing nozzles (only two are shown in FIG. 1) 12 and four tapping openings 13 (only two are shown in FIG. 1) are taken as examples for description, but the disclosure is not limited thereto. The furnace wall 11 defines an accommodating space H for accommodating iron-making raw materials and molten iron 31 and slag 32 produced by smelting the iron-making raw materials. The molten iron 31 and the slag 32 are located at the bottom of the containing space H, and the slag 32 is located on the molten iron 31. The furnace wall 11 may have different thicknesses and/or structural configurations at different places. For example, the furnace wall 11 at the bottom of the blast furnace 10 includes a furnace shell 111 and refractory materials 112. The refractory material 112 includes, for example, carbon bricks or other refractory materials, and in some embodiments, the refractory material 112 may be formed of various materials. In this embodiment, the furnace shell 111 is used as the outer layer of the furnace wall 11, the refractory material 112 is used as the inner layer of the furnace wall 111, and the refractory material 112 is connected to the inner surface of the furnace shell 1111. In other embodiments, different configurations are possible. For example, an intermediate layer with a specific function is provided between the furnace shell 111 and the refractory 112. The blast nozzle 12 penetrates the furnace wall 11 and communicates with the accommodating space H. The blast nozzle 12 can provide heated air into the blast furnace 10. The tap hole 13 penetrates the furnace wall 11 and can communicate with the molten iron 31. In this embodiment, the position of the iron tapping opening 13 is lower than the position of the blowing nozzle 12 and corresponds to the bottom of the accommodating space H to facilitate the extraction of the molten iron 12.

The ironmaking process of the blast furnace 10 is briefly described here. In the ironmaking process, ironmaking raw materials are added from the top of the blast furnace 10, and the ironmaking raw materials include, for example, iron ore, coke, and flux. Coke and iron ore form an alternating layered structure in the blast furnace 10. The hot air discharged from the tuyere 12 burns the coke and produces high-temperature, hot, reducing gas. The rising high-temperature gas stream heats the iron ore and flux, making it liquid and dripping downward. Finally, a large amount of molten iron 31 and slag 32 will accumulate at the hearth. Since the density of the slag 32 is lower than that of the molten iron 31, the slag 32 may float above the molten iron 31. After that, you can use tap 13 to exit Iron work.

The monitoring system 20 of the blast furnace equipment 1 includes a strain gauge 21 and a processing module 22, wherein the strain gauge 21 is coupled to the processing module 22. The strain gauge 21 is installed on the furnace shell 111. Specifically, the strain gauge 21 is provided on the outer surface of the furnace shell 111. In this embodiment, as shown in FIG. 1, the strain gauge 21 is provided under the blower nozzle 12. In another embodiment, the strain gauge 21 may be arranged above the tap hole 13. In another embodiment, the strain gauge 21 may be located in the range between the molten iron 31 and the slag 32, that is, in the vertical direction, the strain gauge 21 is located between the bottom 311 of the molten iron 31 and the liquid level 321 of the slag 32 between.

In an embodiment, the monitoring system 20 may include a plurality of strain gauges 211, and these strain gauges 21 may be distributed along the outer periphery of the furnace shell 111. For example, if there are two strain gauges 21, the two strain gauges 21 can be arranged oppositely; if there are three strain gauges 21, the three strain gauges 21 can be evenly arranged on the outer periphery of the furnace shell 111. In addition, multiple strain gauges 21 can be set at the same height or at different heights to achieve multiple applications. The present disclosure does not limit the types of strain gauges 21, which can be, for example, uniaxial, biaxial, or triaxial strain gauges, nor does it limit the configuration of strain gauges 21, which can be, for example, quarter bridge or half bridge. Or full bridge.

When the blast furnace 10 is performing ironmaking operations, the strain gauge 21 can obtain the strain information of the furnace shell 111. Due to the change in the liquid level of the slag 32 and the pressure generated by the high temperature in the furnace wall 11, the furnace shell 111 generates strain, such as axial strain, bending strain, shear strain, torsional strain, or any combination thereof. When the strain gauge 21 obtains the strain information of the furnace shell 111, the processing module 22 coupled with the strain gauge 21 can use the strain information to monitor the liquid of the slag 32 in the blast furnace 10. Bit. In terms of calculation, the liquid level of the slag 32 can be calculated directly by using the strain information of the furnace shell 111, or the liquid level of the slag 13 can be calculated by using the strain information of the furnace shell 111 indirectly. For example, the strain information of the furnace shell 111 can be converted into other information, such as the stress change of the furnace shell 111, and then the stress change of the furnace shell 111 can be used to calculate the liquid level of the slag 32, or the strain of the furnace shell 111 can be calculated first. The information is filtered, and the filtered strain information is used to calculate the level of the slag 32.

2 is a functional block diagram of a blast furnace slag level monitoring system 20 according to an embodiment of the disclosure. The following example illustrates how to use the strain information of the furnace shell 111 to calculate the liquid level of the slag 32 of the blast furnace 10.

The processing module 22 includes a receiving unit 221, a filtering unit 222, and a calculation unit 223. The receiving unit 221 is coupled to the strain gauge 21 to receive the strain information of the strain gauge 21. The receiving unit 221 can be connected to the strain gauge 21 via wired transmission or wireless transmission to receive strain information. The filter unit 222 is coupled to the receiving unit 221, and can filter out the noise of the strain information or the noise of the stress change converted from the strain information, so as to extract the circumferential stress change of the furnace shell 111.

In one embodiment, the filtering unit 222 is, for example, a suitable digital filter, such as software on a computer, which can filter the corresponding variable information and remove the furnace shell 111 caused only by the liquid level change Δh of the slag 32 The circumferential stress change △σ is extracted. Since the strain information or the stress change △σ may also be caused by other factors, such as the pressure generated by high temperature, it is necessary to use the filter unit 222 to extract the circumferential stress change △σ of the furnace shell 111 caused only by the height change △h .

It should be noted that the filter unit 221 here also uses strain The relationship between information △ε and stress change △σ is (1), and the relationship (1) is as follows: △ε*E=△σ (1)

Where E is the modulus of elasticity of the furnace shell 111. In the calculation, the strain information △ε can be filtered first and then the stress change △σ can be calculated by the relation (1), or the stress change △σ can be calculated by the relation (1) first, and then the stress change △σ can be filtered.

The calculation unit 223 is coupled to the filter unit 222 to receive the stress change Δσ, and use the stress change Δσ to calculate the liquid level change Δh of the slag 32. In one embodiment, the following relational formula (2) between the liquid level change △h of the slag 32 and the circumferential stress change △σ of the furnace shell 111 is used to calculate the slag liquid level change △h: △h=△σ *t/(α*ρ*g*r) (2)

Among them, t is the thickness of the furnace shell 111; α is the ratio of the stress to the inner wall of the furnace shell 111 that is transmitted to the inner wall of the furnace shell 111 by the lateral pressure in the blast furnace 10 acting on the overall furnace wall 11, which cannot be absorbed by the refractory material 112. It is transmitted to the furnace shell 111, so this ratio is related to the structure of the furnace wall 11, and can be obtained, for example, through finite element analysis, or simplified formula, or empirical formula; ρ is the average density of slag 32; g is the acceleration due to gravity ; R is the inner diameter (radius) of the furnace shell 111.

In the above relationship (2), g is a known constant, and Δσ can be obtained from the strain information of the strain gauge 21. In addition, when the blast furnace 10 used is determined, t and r can also be regarded as constants, and α and ρ are almost constants or have slight changes. Therefore, in practice, the α and ρ parameters can be measured once every six months, for example.

In this embodiment, the above-mentioned relationship (2) is used to calculate the slag level change Δh. In other embodiments, it can be found that △h in relation (2) and △σ has a proportional relationship, and other parameters can be regarded as constants. Therefore, in long-term monitoring, the relationship (2) may not even be used, but can be obtained directly from the relationship between strain information and/or stress change △σ and liquid level change △h (for example, linear relationship or non-linear relationship) The liquid level changes by △h.

According to the tapping operation procedure, when the furnace gas is discharged from the tap hole 13 and the slag splashes out, it means that the liquid level of the slag 32 has dropped to the lowest point. Therefore, in one embodiment, the height of the tap hole 13 can be defined as slag The liquid level zero point of 32 can be used to calculate the liquid level height of slag 32 from the liquid level change Δh.

In an embodiment, the monitoring system 20 may further include a notification unit 224 which is coupled to the calculation unit 223. When the monitored liquid level exceeds a predetermined range, the notification unit 224 may issue a warning notification. Of course, the notification unit 224 may have other applications. For example, when the monitored liquid level is in an appropriate range, the notification unit 224 sends out a notification of iron tapping.

FIG. 3 is a chart showing the height of the slag liquid level calculated by the two strain gauges in the embodiment of the disclosure and the history chart of the iron outflow operation from the three tapping holes. The upper curve of Figure 3 is the history curve of the slag level obtained from the strain information of two strain gauges at the same height, and the time length is 24 hours. Since the slag level is not horizontal, the two curves are not the same. The lower bar graph in Fig. 3 is the timetable of the actual tapping operation. The starting point and the end point of each bar graph are the moments when the drilling starts to tap and the hole stops tapping.

In summary, the present disclosure can measure the slag level based on strain information, and can measure the slag level with only one strain gauge. In addition, the relationship between the slag level change and the circumferential stress change of the furnace shell disclosed in this disclosure is simple but very accurate. Moreover, by setting multiple strain gauges at the same height, it can be judged The degree of inclination of the slag liquid level. When the slag liquid level is too high, the tapping operation can be adjusted to lower the liquid level.

4 is a flowchart of a method for monitoring the slag level of a blast furnace according to an embodiment of the disclosure. The monitoring method of this embodiment is applied to the blast furnace 10 shown in FIG. 1 as an example. When monitoring the blast furnace slag level, step S01 can be performed to install a strain gauge 21 on the furnace shell 111 and position the strain gauge 21 below the blast nozzle 12. In other embodiments, a strain gauge 21 may be further provided above the tap hole 13. Next, step S02 is performed to monitor the strain gauge 21 to obtain strain information of the furnace shell 111 when the blast furnace 10 performs ironmaking operations. Then, step S03 is performed to calculate the liquid level of the slag 32 of the blast furnace 10 using the strain information.

Step S03 may include using the filter unit 222 shown in FIG. 2 to filter out the noise of the strain information, or filter out the noise of the stress change converted by the strain information, so as to extract the circumferential stress change of the furnace shell 111. Here, the filtering unit 222 is, for example, a digital filter. By filtering, the circumferential stress change Δσ of the furnace shell 111 caused only by the liquid level change Δh of the slag 32 can be extracted. In addition, in step S03, the liquid level of the blast furnace slag can be calculated using a relational expression, and the relational expression can be, for example, the above-mentioned relational expression (2). For other detailed features of the monitoring method of this embodiment, refer to the above-mentioned embodiments of the blast furnace equipment 1 and the monitoring system 20 thereof.

In summary, this disclosure proposes a method for monitoring the blast furnace equipment and blast furnace slag level. By installing a strain gauge on the blast furnace shell, the strain information of the furnace shell can be used to monitor the slag level in the blast furnace. Achieve a variety of functions, such as directly monitoring the height of the slag liquid level at the hearth, providing on-site determination of the best tapping timing, clogging timing and hole size, and liquid iron The bit is controlled in an appropriate range. In this way, the blast furnace equipment and the monitoring system thereof, and the blast furnace slag level monitoring method disclosed in the present disclosure can monitor the blast furnace slag level to help determine the timing of tapping and mud blocking, and stabilize the tapping operation of the blast furnace.

The features of several embodiments are summarized above, so those who are familiar with the art can better understand the aspect of the disclosure. Those who are familiar with the art should understand that they can easily use the present disclosure as a basis to design or modify other processes and structures, thereby achieving the same goals and/or the same advantages as the embodiments described herein. . Those who are familiar with this art should also understand that these equivalent constructions do not depart from the spirit and scope of this disclosure, and they can make various changes, substitutions and alterations without departing from the spirit and scope of this disclosure.

1‧‧‧Blast furnace equipment

10‧‧‧Blast furnace

11‧‧‧furnace wall

111‧‧‧ Furnace shell

112‧‧‧Refractory

12‧‧‧Blow mouth

13‧‧‧Take Outlet

20‧‧‧Monitoring System

21‧‧‧Strain gauge

22‧‧‧Processing Module

31‧‧‧Molten Iron

311‧‧‧Bottom

32‧‧‧Slag

321‧‧‧Liquid level

H‧‧‧accommodating space

Claims (8)

A blast furnace equipment includes: a blast furnace, including: a furnace wall, the furnace wall defines an accommodating space for accommodating a molten iron and a slag on the molten iron, the furnace wall includes a furnace shell; A blast nozzle penetrates the furnace wall and communicates with the accommodating space; and a plurality of tapholes penetrates the furnace wall and communicates with the molten iron; and a monitoring system including: a strain gauge arranged in On the furnace shell, and the strain gauge is arranged below the blast nozzles, wherein when the blast furnace performs an ironmaking operation, the strain gauge obtains strain information of the furnace shell; and a processing module, and the The strain gauge is coupled, wherein the processing module is configured to receive the strain information and use the strain information to calculate a liquid level of the slag of the blast furnace, wherein the processing module calculates the liquid level of the slag of the blast furnace with a relational expression The relational expression is △h=△σ*t/(α*ρ*g*r), where △h is the change of the liquid level of the slag, △σ is the change of the circumferential stress of the furnace shell, t Is the thickness of the furnace shell, and α is the stress ratio of the inner wall of the furnace shell transmitted by a lateral pressure in the furnace wall acting on the furnace wall, ρ is an average density of the slag, g is the acceleration due to gravity, and r is an inner diameter of the furnace shell. The blast furnace equipment described in item 1 of the scope of patent application, wherein the strain gauge is arranged above the tap holes. The blast furnace equipment described in item 1 of the scope of patent application, wherein the strain gauge is arranged between a bottom of the molten iron and a liquid level of the slag. For the blast furnace equipment described in claim 1, wherein the processing module includes: a receiving unit coupled to the strain gauge to receive the strain information; and a filter unit coupled to the receiving unit and configured A noise of the strain information or a noise of a stress change of the strain information is filtered out to extract a circumferential stress change of the furnace shell. A method for monitoring the slag level of a blast furnace, wherein the blast furnace includes a furnace wall, a plurality of blast nozzles, and a plurality of tap holes. The furnace wall defines an accommodating space for accommodating a molten iron and a portion of the molten iron. The first slag, the furnace wall includes a furnace shell, the blast nozzles pass through the furnace wall and communicate with the accommodating space, the tap holes pass through the furnace wall, and the monitoring method includes: setting a strain Calculate on the furnace shell and place the strain gauge on the drums Below the tuyere; when the blast furnace is performing an ironmaking operation, use the strain gauge to obtain strain information of the furnace shell; and use the strain information to calculate a level of the slag of the blast furnace, wherein the strain information is used to calculate The liquid level of the slag of the blast furnace includes: calculating the liquid level of the slag of the blast furnace using a relational expression, the relational expression being △h=△σ*t/(α*ρ*g*r), where, △h is a level change of the slag, △σ is a circumferential stress change of the furnace shell, t is a thickness of the furnace shell, and α is the result of a lateral pressure in the furnace wall acting on the furnace wall. A stress ratio transmitted to an inner wall of the furnace shell, ρ is an average density of the slag, g is the acceleration of gravity, and r is an inner diameter of the furnace shell. The method for monitoring the slag level of a blast furnace as described in item 5 of the scope of the patent application, wherein using the strain information to calculate the level of the slag of the blast furnace includes: using a filter unit to filter out a noise or the strain information The strain information is a stress change and a noise to extract a circumferential stress change of the furnace shell. According to the method for monitoring the slag level of a blast furnace as described in item 5 of the scope of patent application, wherein arranging the strain gauge on the furnace shell includes: arranging the strain gauge above the tap holes. The method for monitoring the level of blast furnace slag as described in item 5 of the scope of patent application, wherein arranging the strain gauge on the furnace shell includes: arranging the strain gauge between a bottom of the molten iron and a liquid level of the slag between.

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