JP7400786B2 - Refractory residual status estimation method, refractory residual status estimation device, and metal smelting furnace - Google Patents

Description

The present invention relates to a method for estimating the residual state of refractories in a metal smelting furnace, an apparatus therefor, and a metal smelting furnace.

The steelmaking process at a steelworks involves removing impurities such as sulfur and phosphorus from pig iron tapped from a blast furnace (hereinafter referred to as "hot metal") in a hot metal pretreatment process, and then refining it in a converter to convert it into hot metal. This is a process in which carbon contained in the steel is removed, trace elements are added, and the desired molten steel is produced. Refractories are loaded inside the converter furnace used in the steelmaking process to protect the converter body from high-temperature molten iron. Such refractories undergo general wear, local wear, falling off, etc. due to various factors that occur during the operation of the converter. For this reason, in the steelmaking process, it is extremely important to grasp in real time the state of the refractories remaining in the converter furnace.

As a method for measuring the state of wear and tear on refractories in a furnace, there is a measuring means that measures the two-dimensional shape inside the furnace by irradiating the refractory with measurement light, and a moving means that measures the two-dimensional shape of the refractory in the furnace multiple times while moving it within the furnace. A method has been proposed in which the three-dimensional shape inside the furnace is determined by measurement and the state of wear of the refractory is measured based on the determined three-dimensional shape (for example, Patent Document 1).

Furthermore, a method for inspecting a molten metal storage container has been proposed that allows detection of melted parts of refractories without requiring much labor and time (for example, Patent Document 2). This method of inspecting a molten metal container includes the steps of taking a thermal image of the entire shell using multiple imaging means, and the temperature distribution function of the entire shell from the thermal image of the entire shell measured in the imaging step. , and if the calculated maximum value is equal to or greater than a predetermined value, it is determined that there is a possibility that the refractory has been eroded, and predetermined information is output.

Furthermore, a method for detecting the thickness of a refractory has been proposed that can continuously detect the deterioration state of the refractory in real time (for example, Patent Document 3). This refractory thickness detection method focuses on the power generation function and characteristics of thermoelectric elements, and is installed on the refractory wall of a furnace or container used in hot conditions. The deterioration status of the refractory is continuously detected in real time based on the value of the amount of electricity generated at that time.

Japanese Patent Application Publication No. 2015-052555 Japanese Patent Application Publication No. 2016-056398 Japanese Patent Application Publication No. 2008-275203

However, the conventional technology has the following problems that still need to be solved. That is, the method for measuring the state of wear and tear of refractories in a furnace described in Patent Document 1 has the inconvenience of having to insert a measuring device into the furnace of a converter or bring the measuring device close to the mouth of the converter. . In addition, the above method for measuring the state of wear and tear on refractories in the furnace requires measurement when the furnace is empty, so the remaining thickness of the refractories remaining in the converter can be measured in real time during operation of the converter. is impossible to measure.

In addition, in the inspection method for a molten metal storage container described in Patent Document 2, a thermoviewer takes a thermal image of the entire steel shell of the ladle, and a refractory inspection device uses the thermal image of the entire steel shell measured by the thermoviewer. The maximum value of the temperature distribution function of the entire steel shell is calculated, and if the calculated maximum value is greater than or equal to a predetermined value, it is determined that the refractory may have been eroded. For this reason, the above method for inspecting a molten metal storage container has the disadvantage that it is not possible to grasp the status of the refractories present in the molten metal storage container in real time during the operation of the molten metal storage container.

Furthermore, the refractory thickness detection method described in Patent Document 3 can measure the thickness of the refractory remaining in the converter furnace in real time during the operation of the converter; Innumerable measuring elements must be installed in the For this reason, the method for detecting the thickness of refractories has the problem of requiring the introduction and maintenance of necessary elements and members, which is a heavy burden.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to propose a method for estimating the residual state of refractories that can estimate in real time the residual state of refractories present in the furnace during the operation of a metal smelting furnace. purpose.

In order to solve the above problem, the inventors conducted various experiments and focused on the vibration of the furnace body caused by the vibration of the bath surface of the molten material in the metal smelting furnace, and developed an acceleration sensor installed in the metal smelting furnace. The vibration of the furnace body caused by the bath surface vibration at the location where the acceleration sensor is installed is measured while stirring the molten material in the furnace, and the remaining state of the refractory is determined based on the intensity and frequency fluctuations of the measured natural vibrations. We found that it is easy to estimate in real time. In other words, depending on the remaining state of the refractories present in the furnace, the vibrations of the furnace body caused by bath surface vibration with the bottom blowing plume and the nearest furnace wall as vibration ends, bottom blowing gas, and top blowing gas. We focused on the fluctuation of the intensity and frequency of the vibration of the furnace body caused by the vibration of the bath surface in the circumferential direction with the outer periphery of the top-blown gas collision part as the vibration end. The present invention has been made based on the above findings, and the gist thereof is as follows.

The method for estimating the residual state of refractories of the present invention, which advantageously solves the above problems, is a method for estimating the residual state of refractories in a metal smelting furnace in real time during furnace operation. is used to measure vibrations caused by bath surface vibrations of the molten material in the metal smelting furnace, and estimate the remaining state of the refractory based on fluctuations in either one or two of the intensity and frequency of the vibrations. be.

Note that the method for estimating the refractory remaining status according to the present invention is as follows:
(a) using the acceleration sensor to measure vibrations during furnace operation caused by bath surface vibrations of the molten material in the metal smelting furnace caused by bottom-blown gas;
Among the measured vibrations, fluctuations in either one or two of the intensity and frequency of the bath surface vibration f _A or its overtone f _A ⁿ with the bottom blowing plume and the nearest furnace wall as vibration ends estimating the residual state of refractories in the metal smelting furnace based on the method;
(b) using the acceleration sensor to measure vibrations during furnace operation caused by bath surface vibrations of the molten material in the metal smelting furnace caused by bottom-blown gas and top-blown gas;
Among the measured vibrations, fluctuations in either one or two of the intensity and frequency of the bath surface vibration f _B or its overtone f _B ⁿ in the circumferential direction with the outer periphery of the top-blown gas collision part as the vibration end estimating the remaining refractory status based on
(c) using the acceleration sensor to measure vibrations during furnace operation caused by bath surface vibrations of the molten material in the metal smelting furnace caused by bottom-blown gas and top-blown gas;
Of the measured vibrations, the remaining state of the refractory is estimated based on fluctuations in either one or two of the intensity and frequency of the bath surface vibration f ₀ or its overtone f ₀ ⁿ of the molten material in the metal smelting furnace. to do,
(d) Vibration caused by bath surface vibration of the molten material in the metal smelting furnace is measured by one or more of the acceleration sensors installed on the furnace body of the metal smelting furnace or a plurality of peripheral members provided outside the furnace body. to do,
(e) The metal refining process is carried out by the two or more acceleration sensors installed at different positions in the furnace body of the metal refining furnace or in any one of a plurality of peripheral members provided outside the furnace body and in mutually different axial directions. Measuring vibrations caused by bath surface vibrations of the molten material in the furnace;
It is thought that this could be a more preferable solution.

The refractory residual status estimation device of the present invention, which advantageously solves the above problems, is a refractory residual status estimation device that estimates the refractory residual status in a metal refining furnace in real time during furnace operation. An acceleration sensor that is attached to a furnace body of a refining furnace or any one of a plurality of peripheral members provided outside the furnace body and measures vibrations at the installation point caused by vibrations of the bath surface of molten material in the furnace during furnace operation; and an estimating device that estimates the remaining state of the refractory based on a change in one or two of the intensity and frequency of the vibration measured by the acceleration sensor.

The refractory remaining state estimating device of the present invention, which advantageously solves the above problems, is attached to a furnace body and any one of a plurality of peripheral members provided on the furnace body or outside the furnace body, and is installed in a furnace during operation of the furnace. an acceleration sensor that measures vibrations caused by bath surface vibrations of the internal molten material, and estimates the remaining state of the refractory based on fluctuations in one or two of the intensity and frequency of the vibrations measured by the acceleration sensor; and an estimation device that performs.

According to the present invention, the bath surface vibration has the bottom-blown plume caused by the bottom-blown gas and the nearest furnace body wall as the vibration end, and the bottom-blown gas and the top-blown gas have the bath surface vibration with the outer periphery of the top-blown gas collision part as the vibration end. By focusing on the fluctuation of the bath surface vibration of the molten material in the metal refining furnace due to the directional bath surface vibration or the bottom blowing gas and top blowing gas, it is possible to check the remaining status of refractories in real time during the operation of the metal refining furnace. It became possible to estimate.

FIG. 1 is a schematic diagram of a metal refining furnace of the present invention. FIG. 2 is a schematic diagram of a water model device imitating a converter for confirming the principle of the present invention, in which (a) shows a vertical sectional view, and (b) a schematic plan view showing the arrangement of bottom-blown gas. shows. It is a graph showing a bath surface vibration spectrum measured with an acceleration sensor when bottom blowing gas is blown, and shows a case where the Styrofoam thickness is 0 mm (nothing) and a case where the Styrofoam thickness is 15 mm. It is a graph showing bath surface vibration spectra caused by bottom-blown gas and top-blown gas measured by an acceleration sensor, and shows a case where the Styrofoam thickness is 0 mm (nothing) and a case where the Styrofoam thickness is 15 mm.

The details of the invention will be explained below. In this embodiment, a converter for refining molten iron is used as an example of a metal refining furnace, but if the metal refining furnace has a refractory inside the shell, the limitations of the present invention may apply depending on the application. It is not something that is received. In addition, in the following embodiments, the acceleration sensor is installed on the trunnion shaft of the trunnion, but the acceleration sensor can be used at any location where the bath surface vibration of the molten iron in the furnace (molten material in the furnace) can be indirectly measured. may be installed at any of a plurality of peripheral members provided in the furnace body or outside the furnace body, such as a trunnion ring of a trunnion, a tilting bearing, a tilting device, etc. Further, a plurality of acceleration sensors may be installed and the direction of acceleration to be measured may be different for each acceleration sensor. First, a method and apparatus for estimating the remaining state of refractories according to the present invention will be explained.

<Metal smelting furnace>
FIG. 1 is a schematic diagram of a metal smelting furnace to which the method for estimating the residual state of refractories of the present invention is applied.
As shown in FIG. 1, the metal refining furnace 100 of this embodiment includes a furnace body 101 made of iron. Specifically, the metal refining furnace 100 is attached to a furnace body 101 and any one of a plurality of peripheral members provided on the furnace body 101 or outside the furnace body 101, and is installed during furnace operation, that is, in-furnace melting. An acceleration sensor 105 measures vibrations caused by bath surface vibrations of the molten material 102 in the furnace during refining, and fire resistance is determined based on fluctuations in one or two of the intensity and frequency of the vibrations measured by the acceleration sensor 105. and an estimation device 108 for estimating the remaining status of the object. A refractory 103 is provided along the inner wall of the furnace body 101 in order to protect the furnace body 101 from the high-temperature melt 102 in the furnace.

A trunnion 104 is provided on the outer wall surface of the furnace body 101 and includes a plurality of trunnion shafts 141 protruding from the furnace body 101 and a ring-shaped trunnion ring (not shown) surrounding the furnace body 101. There is. An acceleration sensor 105 that measures vibrations in the axial direction 151 of the trunnion shaft 141 is attached to at least one of the plurality of trunnion shafts 141 . The acceleration sensor 105 is, for example, a semiconductor type sensor, and by measuring the vibration in the axial direction 151 of the trunnion shaft 141, it measures the vibration caused by the bath surface vibration of the melt in the furnace 102 during the refining of the melt in the furnace. do.

As in this embodiment, by installing the acceleration sensor 105 on the trunnion shaft 141 of the trunnion 104 provided outside the furnace body 101 of the metal refining furnace 100, the acceleration sensor is installed in the furnace body 101 or inside the furnace body 101. Compared to the above configuration, it is not necessary to install a cooling device or the like for cooling the acceleration sensor, and the configuration of the metal refining furnace can be simplified.

The metal refining furnace 100 of this embodiment has a technical feature in that the acceleration sensor 105 is attached to the outside of the furnace body 101. In the metal refining furnace 100 of this embodiment, the acceleration sensor 105 is not installed inside the furnace body 101. Therefore, the acceleration sensor 105 does not receive heat directly from the high-temperature in-furnace melt 102 existing inside the furnace body 101, and does not reach a high temperature. In the metal refining furnace 100 of this embodiment, the acceleration sensor 105 is located outside the furnace body 101, for example, in a plurality of peripheral members to which bath surface vibrations measured in the first to fourth embodiments below are transmitted. It only needs to be attached to any location.

Further, an estimating device 108 is connected to the acceleration sensor 105, and this estimating device 108 calculates the remaining amount of refractories based on fluctuations in either one or two of the vibration intensity and frequency measured by the acceleration sensor 105. Estimate the situation. Note that the specific configuration of the estimation device will be described in detail later.

<Embodiment 1>
In the first embodiment, the sensor installation position is determined by one acceleration sensor 105 installed on the trunnion shaft 141 during stirring of the molten iron in the furnace (in-furnace molten material 102) by the bottom-blown gas from the bottom-blowing tuyere 106 of the converter. That is, the vibration of the trunnion shaft 141 is measured. Among the measured vibrations, the bath surface vibration of the molten iron in the furnace (the molten material in the furnace 102) is used to estimate the remaining state of the refractory 103. At this time, the intensity and frequency of the natural vibration f _A of the molten iron bath surface in the furnace and its harmonics f A ⁿ with the bottom-blowing plume and the nearest furnace wall as vibration ends, as shown in Equation (1 ₎ of Equation 1 below. We focus on changes in Here, the bottom blowing plume refers to the apex of the bulge on the bath surface formed by the bottom blowing gas, and the closest furnace wall refers to the furnace wall (inner wall of the furnace body) closest to the bottom blowing plume. ). In the formula (1), g represents gravitational acceleration, π represents pi, L _A represents the distance between the bottom blowing plume and the nearest wall of the reactor body, and H represents the bath depth. As the overall wear and tear of the refractory 103 in the furnace progresses, the natural vibration f _A and its overtones f _A ⁿ with the bottom blowing plume and the nearest furnace wall as vibration ends increase in intensity and reach a peak frequency. Since the position shifts to the high frequency side, by detecting this, the overall degree of wear and tear on the refractory 103 can be estimated. In the above embodiment, the structure is such that the intensity and frequency fluctuations of both the _bath surface vibration f _A and its ^overtone f _{A n} are detected ^. It may be configured to detect fluctuations in one or two of the above. In this case as well, it is possible to estimate the overall degree of wear and tear on the refractory 103.

<Embodiment 2>
In the second embodiment, during stirring of the molten iron in the furnace (in-furnace molten material 102) by bottom-blown gas from the converter bottom- blowing tuyere 106 and top-blown gas from the top-blowing lance 107, the trunnion shaft 141 Vibration of the sensor installation position, that is, the trunnion shaft 141, is measured by one installed acceleration sensor 105. Among the measured vibrations, the bath surface vibration of the molten iron in the furnace (the molten material in the furnace 102) is measured. At this time, attention is paid to the fluctuation in the intensity of the bath surface vibration f _B and its harmonics f _{B n in the circumferential direction with the outer periphery of the top-blown gas collision part as the vibration end, as shown in Equation (2} ⁾ of Equation 2 below. Here, the top-blown gas collision area is also called the fire point and refers to the jet impact diameter, that is, the concave part of the bath surface caused by the collision of the top-blown gas. In the formula (2), g is the gravitational acceleration, π is the circumference, L _B is the diameter of the top-blown gas collision part (jet collision diameter), and H is the bath depth. As the overall wear and tear of the furnace refractories 103 progresses, the intensity of bath surface vibration in the circumferential direction with vibration ends at the outer periphery of the top-blown gas collision area and the nearest furnace wall increases, and the frequency decreases to its peak position. is shifted to the lower frequency side, and by detecting this, the overall degree of wear and tear on the refractory 103 can be estimated. In addition, in the above embodiment, the structure is such that fluctuations _in the intensity and frequency of both the _bath surface vibration f _B and its overtone f _B ⁿ are detected ^. It may be configured to detect fluctuations in one or two of the above. In this case as well, it is possible to estimate the overall degree of wear and tear on the refractory 103.

<Embodiment 3>
In the third embodiment, during stirring of the molten iron in the furnace (in-furnace molten material 102) by the bottom blowing gas from the converter bottom blowing tuyere 106 and the top blowing gas from the top blowing lance 107, the trunnion shaft 141 is Vibration of the sensor installation position, that is, the trunnion shaft 141, is measured by one installed acceleration sensor 105. Among the measured vibrations, the bath surface vibration of the molten iron in the furnace (the molten material in the furnace 102) is used to estimate the remaining state of the refractory 103. At this time, attention is paid to the fluctuations in the intensity and frequency of the bath surface vibration f ₀ of the molten iron in the furnace and its overtone f ₀ ⁿ , as shown in equation (3) of Equation 3 below. Here, in formula (3), π represents pi, g represents gravitational acceleration, κ represents a constant, D represents the furnace inner diameter, and H represents the bath depth. As the overall wear and tear of the refractory 103 in the furnace progresses, the bath surface vibration f ₀ of the molten iron in the furnace and its overtones f ₀ ⁿ increase in intensity, and the peak position of the frequency shifts to the lower frequency side. By detecting this, the overall degree of wear and tear on the refractory 103 can be estimated. ^Note that in the above embodiment, _{the structure is such that fluctuations in the intensity and frequency of both the bath surface vibration f 0 and its overtone f 0 n are detected} ^; It may be configured to detect fluctuations in one or two of the above. In this case as well, it is possible to estimate the overall degree of wear and tear on the refractory 103.

<Embodiment 4>
In addition to the embodiment described above, for example, a configuration may be adopted in which two or more acceleration sensors 105 are installed on the trunnion shaft 141 of the trunnion 104. By installing two or more acceleration sensors 105 at different positions and in different axial directions and comparing the measurement results of each acceleration sensor 105, it is possible to determine the degree and position of local wear and fall of the refractory 103. It is possible to estimate.

<Refractory remaining status estimation device>
The apparatus for estimating the residual state of refractories according to the present invention is a suitable apparatus used in the method for estimating the residual state of refractories described above, and includes a plurality of surroundings provided in the furnace body 101 of the metal refining furnace 100 or outside the furnace body 101. An acceleration sensor 105 that is attached to any part of the member and measures vibrations at the installation location caused by bath surface vibrations of the molten material 102 in the furnace during refining of the molten material in the furnace, and a furnace that is measured by the acceleration sensor 105. and an estimating device 108 that estimates the remaining state of the refractory 103 based on fluctuations in either the intensity or the frequency of the bath surface vibration of the internal molten material 102.

The refractory remaining status estimation device (estimation device 108) receives the operating status of the converter from, for example, a process computer that manages the operating status of the converter. When the refractory remaining status estimating device (estimating device 108) receives an instruction to estimate the remaining refractory status of the refractory 103 from the outside, the refractory remaining status estimating device (estimating device 108) estimates the optimal refractory remaining status based on the first to fourth embodiments described above. Choose a method. Then, it is preferable to output the estimated refractory remaining status or send it to the process computer. Depending on the obtained refractory residual status, measures such as replenishment of refractories can be taken.

<Example 1>
The principle of the present invention was confirmed using a water model. The water model was used here for the following reasons. Although molten steel is heavier than water, it is also more viscous, and molten steel and water have almost the same kinematic viscosity. Therefore, by using containers of similar shapes, the Reynolds number, which is a dimensionless number, can be matched. In addition, by using the so-called modified Froude number, it is possible to reproduce the flow of molten steel with respect to gravity, inertial force, and viscous force using a water model.

An overview of the water model device 200 used in FIG. 2 is shown. FIG. 2(a) is a vertical sectional view, and FIG. 2(b) is a plan view. In this example, after installing Styrofoam simulating a refractory as a simulating refractory 203 on the inner wall of a cylindrical container 201 simulating a converter having a bottom blowing tuyere 206 and a trunnion shaft 204, water 202 simulating molten iron is installed. was placed in a cylindrical container 201, and the inside of the cylindrical container 201 was stirred using bottom-blown gas. Compressed air was blown at 15.7 L/min as bottom-blown gas to stir the inside of the container. The cylindrical container 201 has an inner diameter of 350 mm, and the bottom blowing tuyere 206 has a P. C. Four holes each having a diameter of 2 mm were provided on a circumference of D (pitch circle diameter) of 170 mm. Here, one acceleration sensor 205 is installed on the trunnion shaft 204 to measure bath surface vibration in the axial direction 251 (FIG. 2). Note that bubbles 261 are formed inside the water 202 by the bottom-blown gas.

In order to see the influence of the refractory remaining inside the container on vibration, when measuring the bath surface vibration, we changed the thickness of the Styrofoam that is the simulated refractory 203 installed on the inner wall of the cylindrical container 201 (0 mm, 15 mm), and The changes in bath surface vibration due to changes in the thickness of the refractories were measured to simulate the overall wear and tear of each refractory. The experimental results are shown in Figure 3. FIG. 3 is a graph showing bath surface vibration spectra during bottom-blown gas injection measured by the acceleration sensor 205, and shows the cases where the foamed polystyrene thickness is 0 mm (nothing) and the foamed polystyrene thickness is 15 mm. As is clear from Fig. 3, when the thickness of Styrofoam is reduced, the intensity of the natural vibration f _A and its overtone f ^{A n} _with the bottom-blowing plume and the nearest wall of the reactor body as vibration ends increases, and the frequency The peak position of has shifted to the lower frequency side. Focusing on the above, it is possible to estimate the overall degree of wear of the refractory by detecting the natural vibration f _A and its overtone f _A ⁿ .

<Example 2>
As in Example 1, using the water model device 200 shown in FIG. 2, Styrofoam as a simulated refractory 203 was installed on the inner wall of a cylindrical container 201 imitating a converter having a bottom blowing tuyere 206 and a trunnion shaft 204. After that, water 202 imitating molten iron was placed in the cylindrical container 201, and the inside of the cylindrical container 201 was stirred using bottom-blown gas and top-blown gas. In this example, a top blowing lance 207 with an outlet diameter of 6.6 mm is used, and a jet stream 271 with a top blowing gas flow rate of 300 L/min is sprayed onto the bath surface from a distance HL = 160 mm from the bath surface. Ta. In addition, compressed air is blown in at 15.7 L/min as bottom-blown gas to stir the inside of the container. The cylindrical container 201 has an inner diameter of 350 mm, and the bottom blowing tuyere 206 has a P. C. Four holes each having a diameter of 2 mm were provided on a circumference of D (pitch circle diameter) of 170 mm. Here, one acceleration sensor 205 is installed on the trunnion shaft 204 to measure vibration.

In order to see the influence of the refractory remaining inside the container on vibration, when measuring the bath surface vibration, we changed the thickness of the Styrofoam that is the simulated refractory 203 installed on the inner wall of the cylindrical container 201 (0 mm, 15 mm), and The changes in bath surface vibration due to changes in the thickness of the refractories were measured to simulate the overall wear and tear of each refractory. The experimental results are shown in Figure 4. FIG. 4 is a graph showing bath surface vibration spectra caused by bottom-blown gas and top-blown gas measured by the acceleration sensor 205, and shows the cases where the Styrofoam thickness is 0 mm (nothing) and the case where the Styrofoam thickness is 15 mm. . As is clear from FIG. 4, when the thickness of the polystyrene foam is reduced, the intensity of the bath surface vibration f _B in the circumferential direction with the outer periphery of the top-blown gas collision part as the vibration end and its overtone f _B ⁿ increases, The frequency peak position has shifted to the lower frequency side. Focusing on the above, it is possible to estimate the overall degree of wear of the refractory by detecting the circumferential bath surface vibration f _B and its overtones f _B ⁿ with the outer periphery of the top-blown gas collision part as the vibration end. .

<Example 3>
Among the vibration spectra obtained using the apparatus and experimental conditions of Example 2, the bath surface vibration (natural vibration of the entire bath surface) f ₀ and its overtone f ₀ ⁿ of the water 202 in the cylindrical container 201 are shown in FIG. As stated above, when the thickness of Styrofoam is reduced, its strength increases and the frequency peak position shifts to the lower frequency side, so by detecting this, it is possible to estimate whether there is any remaining refractory material. Focusing on the above, it is possible to estimate the overall degree of wear of the refractory by detecting the bath surface vibration (natural vibration of the entire bath surface) f ₀ of the water 202 in the cylindrical container 201 and its overtone f ₀ ⁿ . can.

According to the technology for estimating the residual state of refractories according to the present invention, the residual state of refractories during metal refining can be estimated in real time, which contributes to stable operation of metal refining furnaces and is industrially useful.

100 Metal refining furnace 101 Furnace body 102 Melt in the furnace 103 Refractory 104 Trunnion 141 Trunnion shaft 105 Acceleration sensor 151 Axial direction 106 Converter bottom blowing tuyere 107 Top blowing lance 108 Estimating device 200 Water model device 201 Cylindrical container 202 Water 203 Simulated refractory (styrofoam)
204 Trunnion shaft 205 Acceleration sensor 251 Axial direction 206 Bottom blowing tuyere 261 Air bubble 207 Top blowing lance 271 Jet stream

Claims (7)

A refractory residual status estimation method for estimating the residual status of refractories in a metal smelting furnace in real time during furnace operation, the method comprising:
Using an acceleration sensor, we measure the vibrations during furnace operation caused by the bath surface vibration of the molten material in the metal smelting furnace caused by bottom blowing gas ,
Among the measured vibrations, fluctuations in one or two of the intensity and frequency of the bath surface vibration f _A or its overtone f _A ⁿ with the bottom blowing plume and the nearest furnace wall as the vibration ends Estimate the remaining status of refractories based on
Method for estimating the residual status of refractories. A refractory residual status estimation method for estimating the residual status of refractories in a metal smelting furnace in real time during furnace operation, the method comprising:
Using an acceleration sensor , we measure the vibrations during furnace operation caused by the bath surface vibration of the molten material in the metal smelting furnace caused by bottom-blown gas and top- blown gas,
Among the measured vibrations, fluctuations in either one or two of the intensity and frequency of the bath surface vibration f _B or its overtone f _B ⁿ in the circumferential direction with the outer periphery of the top-blown gas collision part as the vibration end Estimate the remaining refractory status based on
Method for estimating the residual status of refractories . A refractory residual status estimation method for estimating the residual status of refractories in a metal smelting furnace in real time during furnace operation, the method comprising:
Using an acceleration sensor , we measure the vibrations during furnace operation caused by the bath surface vibration of the molten material in the metal smelting furnace caused by bottom-blown gas and top- blown gas,
Of the measured vibrations, the remaining state of the refractory is estimated based on fluctuations in either one or two of the intensity and frequency of the bath surface vibration f ₀ or its overtone f ₀ ⁿ of the molten material in the metal smelting furnace. do ,
Method for estimating the residual status of refractories . Vibration caused by bath surface vibration of the molten material in the metal smelting furnace is measured by one or more of the acceleration sensors installed on a furnace body of the metal smelting furnace or a plurality of peripheral members provided outside the furnace body. The method for estimating the residual state of refractories according to any one of Items 1 to 3 . The two or more acceleration sensors installed at different positions in the furnace body of the metal smelting furnace or in any one of a plurality of peripheral members provided outside the furnace body and in mutually different axial directions are used to detect melting in the metal smelting furnace. The method for estimating the refractory remaining status according to any one of claims 1 to 3 , which comprises measuring vibrations caused by vibrations of the bath surface of objects. A refractory residual status estimating device that estimates the residual status of refractories in a metal smelting furnace in real time during furnace operation,
A bottom-blown gas of the molten material in the metal smelting furnace, or the bottom-blown gas and top-blown gas, which is attached to the furnace body of a metal smelting furnace or any one of a plurality of peripheral members provided outside the furnace body, and is used for bottom-blown gas of the molten material in the metal smelting furnace during furnace operation. an acceleration sensor that measures vibrations at the installation location caused by bath surface vibrations caused by
Among the vibrations measured by the acceleration sensor, the bath surface vibration f _A or its overtone f _A ⁿ has the bottom-blowing plume and the nearest furnace wall as the vibration end , and the vibration end has the outer periphery of the top-blowing gas collision area. Any one or two of the intensity and frequency of the bath surface vibration f _B or its overtone f _B ⁿ in the circumferential direction , and the bath surface vibration f ₀ of the molten material in the metal smelting furnace or its overtone f ₀ ⁿ an estimation device for estimating the remaining state of refractories based on fluctuations in the
A device for estimating the remaining state of refractories. Furnace body and
Attached to any part of the furnace body or a plurality of peripheral members provided outside the furnace body, and caused by bottom blowing gas of the molten material in the metal refining furnace during furnace operation, or the bottom blowing gas and top blowing gas. an acceleration sensor that measures vibrations caused by bath surface vibration;
Among the vibrations measured by the acceleration sensor, the bath surface vibration f _A or its overtone f _A ⁿ has the bottom-blowing plume and the nearest furnace wall as the vibration end , and the vibration end has the outer periphery of the top-blowing gas collision area. Any one or two of the intensity and frequency of the bath surface vibration f _B or its overtone f _B ⁿ in the circumferential direction , and the bath surface vibration f ₀ of the molten material in the metal smelting furnace or its overtone f ₀ ⁿ an estimation device for estimating the remaining state of refractories based on fluctuations in the
Metal smelting furnace with.

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