JP4853804B2 - Blast furnace bottom management method - Google Patents

Description

  The present invention uses muon measurement and temperature measurement by thermocouple to complement each other and grasps long-term displacement of refractory thickness by muon measurement, and by using temperature measurement by thermocouple as a reference, deposits on refractory, The present invention relates to a blast furnace bottom management method for managing short-term changes such as thickness.

  It is important to estimate the amount of wear caused by erosion of refractories on the bottom and side walls of the blast furnace bottom, such as refractory bricks, when determining the blast furnace renovation time, maintaining and controlling the blast furnace.

  As one method of estimating the amount of wear of the bottom refractory, based on the measured temperature of the thermocouple embedded in two points in the refractory brick, from the temperature and distance between the two points and the thermal conductivity of the refractory brick A method has been proposed in which a heat flux is calculated and estimated by a method of calculating the remaining thickness assuming that the temperature of the working surface in the furnace is the temperature at which the hot metal solidifies, for example (Patent Document 1).

  As another method for estimating the wear amount of the bottom refractory, a method of measuring the wear amount (residual thickness) of the blast furnace bottom refractory using cosmic ray muons has been proposed (Patent Document 2). .

  The measurement method using this cosmic ray muon measures the intensity of the muon that has passed through the bottom of the blast furnace furnace, the first data of the muon intensity measured at the time of building the furnace, the second data of the muon intensity after the passage of time, The thickness of the refractory is estimated from the muon strength at the time of acquiring the second data based on the characteristic line indicating the relationship between the muon strength change and the refractory thickness.

  This characteristic line is obtained by assuming that the material penetration force of muon has the following relationship between energy E and penetration force X (m), and the specific gravity of the material is iron of 7.8.

X = 7.8 × 2.5 × 10 ³ In (1.56 · E + 1)
Then, by measuring the first data at the time of furnace building (maximum refractory thickness), it is possible to draw a characteristic line that falls to the right from the above formula and the dimensions and specific gravity of each part. Therefore, by appropriately measuring the muon strength, the thickness of the refractory can be estimated, and the blast furnace renovation time can be determined.
Japanese Patent Laid-Open No. 2002-266011 JP-A-8-261741

  In the method for estimating the amount of blast furnace bottom refractory wear using a thermocouple as described above, the estimated amount of wear and the actual amount of refractory bricks are actually thicker than the estimated amount of wear. There may be a large difference in the amount of wear.

  As one of the causes for the difference in the amount of wear in this way, it can be considered that the resistance to hot metal of the brick has been improved.

  On the other hand, in the method of measuring the wear amount of the blast furnace bottom refractory using the above-described muon, the characteristic line drawn from the muon strength and the thickness of the refractory of the first data measured at the time of building the furnace is used. Is used to plot the intensity of the muon that has passed through the actual blast furnace in operation, and the thickness of the refractory at that time is estimated as the thickness of the refractory at the bottom of the blast furnace.

  The purpose of the present invention is made in view of such a viewpoint, and the long-term displacement of the refractory thickness is grasped by the muon measurement using the muon measurement and the temperature measurement by the thermocouple in a complementary manner. It is intended to provide a blast furnace bottom management method that manages short-term changes such as the thickness of deposits on refractories by measuring temperature with a thermocouple.

  The present invention has been made to solve the above problems, and the gist thereof is as follows.

(1) in accordance with the measured temperature measured by the temperature measuring means arranged in the furnace bottom refractory of the blast furnace to estimate the remaining thickness of the hearth refractory, the furnace bottom measured temperature by using a cosmic ray muons the boundary position estimated at the boundary position estimating means for estimating a boundary position between the refractory and the furnace a blast furnace bottom management method that complements the remaining thickness, the boundary position estimating means, measures a cosmic ray muons the measuring unit for the furnace bottom transparently woo Chusen muons intensity flying passes through the furnace bottom of a blast furnace, and the furnace SokoToru over woo Chusen muons incident direction of the determination information, non-permeate space which does not transmit blast furnace The line muon intensity is accumulated for a certain period of time, and a plurality of average densities are set based on the known information on the density of the furnace bottom refractory and the known information on the density of the material in the furnace, and the bottom penetration of the furnace bottom is determined for each average density. over woo Chusen muon intensity and nontransparent cosmic rays Myuo Obtains a distribution model of the intensity ratio of the intensity, using a pre-Symbol distribution model, representative of the average density of the relationship with the average of the intensity ratio of the area to be assumed boundary of the furnace bottom refractory and furnace material strength ratio - determined density characteristic line, the intensity ratio - using density characteristic line corresponding to the intensity ratio between RosokoToru over woo Chusen muon intensity and nontransparent cosmic ray muons intensity in the stored measured data average blast furnace bottom management method characterized by identifying the density to estimate the boundary position of the furnace bottom refractory and furnace material based on the average density which is the identified.

( 2 ) The bottom of the furnace where the residual thickness of the bottom refractory is estimated according to the temperature measured by the temperature measuring means arranged in the bottom refractory of the blast furnace, and the temperature is measured using a cosmic ray muon A blast furnace bottom management method for complementing the remaining thickness by the wear amount estimated by a wear amount estimation means for estimating a wear amount of a refractory, wherein the wear amount estimation means is measured by a measuring unit that measures a cosmic ray muon. , Stored for a certain period of time the core bottom transmission cosmic ray muon intensity transmitted through the bottom of the blast furnace, the discrimination information of the flying direction of the core bottom transmission cosmic ray muon, and the non-transparent cosmic ray muon intensity that does not transmit through the blast furnace A plurality of average densities are set based on the known information on the density of the furnace bottom refractory and the known information on the density of the material in the furnace, and the furnace bottom transmitted cosmic ray muon intensity and the non-transparent universe at the furnace bottom for each average density. Strength ratio with line muon intensity A first distribution model is obtained, and using the first distribution model, an intensity ratio representing a relationship between an average of the intensity ratio and an average density of a region assumed to be a boundary between a furnace refractory and an in-furnace material− Obtain the density characteristic line, and use the intensity ratio-density characteristic line to identify the average density corresponding to the intensity ratio between the bottom transmitted cosmic ray muon intensity and the non-transmitted cosmic ray muon intensity in the accumulated measured data, A plurality of wear amounts are set, and a second distribution model of the intensity ratio between the bottom transmitted cosmic ray muon intensity and the non-transmitted cosmic ray muon intensity at the bottom of the furnace is determined for each amount of wear using the specified average density. Using the second distribution model, a strength ratio-amount of wear characteristic line representing the relationship between the average of the strength ratio of the region assumed to be the boundary between the bottom refractory and the in-furnace material and the amount of wear is obtained. , Using the strength ratio-amount of wear characteristic line, the accumulation Identifying the amount of wear corresponding to the intensity ratio between the bottom-through cosmic ray muon intensity and the non-transparent cosmic ray muon intensity in the measured data obtained, and estimating the specified amount of wear as the amount of wear of the bottom refractory A blast furnace bottom management method characterized by the above.

(3) the boundary position estimating means, measures the hearth transparently woo Chusen muons flying in through the furnace bottom of the blast furnace, outside the furnace of the blast furnace, at a position spaced horizontally from the high furnace The blast furnace bottom management method according to (1), wherein the method is performed.

(4) the boundary position estimating means, measures the hearth transparently woo Chusen muons flying in through the furnace bottom of the blast furnace, the furnace bottom refractory measured by the temperature measuring means as a measurement target, ( 1 ) characterized in that the measurement is performed simultaneously at multiple locations around the furnace bottom or at different times, and the boundary position of the measurement target is estimated in two dimensions based on the measurement results at each measurement position. Blast furnace bottom management method.

(5) the boundary position estimating means, measures of cosmic-ray muons in the furnace bottom permeation flying passes through the furnace bottom of the blast furnace, and carrying out a furnace bottom base portion of the blast furnace (1) The blast furnace bottom management method described.
(6) In the feature (2), the wear amount estimation means performs measurement of a cosmic ray muon transmitted through the bottom of the blast furnace and transmitted through the bottom of the blast furnace. The blast furnace bottom management method described.

  According to the present invention, the estimated thickness of the refractory based on the measured temperature measured by a temperature measuring means such as a thermocouple through the bottom refractory, the refractory inside the blast furnace bottom using the cosmic ray muon, and the refractory Therefore, the remaining thickness of the refractory can be estimated with higher accuracy.

First Embodiment FIG. 1 is a longitudinal sectional view for explaining a blast furnace bottom management method according to a first embodiment of the present invention, and FIG. 2 is a plan view of FIG. FIG. 3 is a perspective view showing a schematic configuration of a measuring device for cosmic ray muons.

  1 and 2, the blast furnace 1 is provided at a height H with respect to the ground level (GL), and the bottom plate 3 and the side walls 4 of the furnace bottom 2 are lined with refractory bricks 5 as refractories. ing. 6 indicates the level of the tap.

  A plurality of sets of first thermocouples 9a and first thermocouples 9b, which are temperature measuring means, are arranged on a refractory brick 5 as a refractory for the bottom 3 and the side wall 4 forming the furnace bottom 2, for example, It is also arranged at a part where the amount of wear is large, such as the lower part of the mouth 6.

  The 1st thermocouple 9a is located in the near side in a furnace, and the 2nd thermocouple 9b is arrange | positioned in the back. Detection signals from the first thermocouple 9a and the second thermocouple 9b of each set arranged in each part are input to a remaining thickness calculator 10a that calculates a remaining thickness (hereinafter abbreviated as remaining thickness). The remaining thickness of the refractory brick at the part is calculated, and the remaining thickness as the calculation result is displayed on the display 10b such as a monitor or a printer.

  The arrangement positions d1 and d2 of the first thermocouple 9a and the second thermocouple 9b with respect to the refractory brick are determined, and the thermal conductivity of the refractory brick is also determined. Therefore, as shown in FIG. 2B, based on the measured temperatures (t1, t2) of the first thermocouple 9a and the second thermocouple 9b embedded in the two points (d1, d2) in the refractory brick. By calculating the heat flux from the temperature and distance between two points and the thermal conductivity of the refractory brick, the temperature-refractory brick residual thickness characteristic diagram shown in FIG. 2B is obtained. And assuming that the temperature of the working surface in the furnace is, for example, 1150 degrees which is the temperature at which the hot metal solidifies, the remaining thickness d3 of the refractory brick at this time can be calculated.

  The remaining thickness of the refractory brick estimated in this way is that the hot metal in the furnace is in contact with the inner end face of the refractory brick, for example, that no hot metal has entered between the refractory bricks, or the hot metal has oozed into the refractory brick. It is assumed that it is not included.

  In the present embodiment, a determination means (hereinafter referred to as a boundary position measuring device) for determining the boundary position in the furnace and the refractory brick whose temperature is measured by a pair of thermocouples 9a and 9b by measuring the cosmic ray muon. The boundary position measuring device will be described below, which is determined and supplemented with the remaining thickness of the refractory brick estimated based on the thermocouple based on the boundary position.

  In the present embodiment, the measuring device 11 that measures the boundary position between the refractory brick and the furnace by measuring the cosmic ray muon (hereinafter referred to as muon) μ is arranged at a distance L from the blast furnace 1 in the horizontal direction, The muon μ coming from the blast furnace 1 side is measured, and the muon μ coming without passing through the blast furnace 1 is also measured.

  In FIG. 3, the cosmic ray muon measuring device 11 according to the present embodiment includes a measuring unit 12 installed with the front measurement surface facing the blast furnace, and the muon intensity based on the measurement result measured by the measuring unit 12. And the calculated incident direction (horizontal angle and elevation angle) of the cosmic ray muon and stored in the storage unit 13 and a calculation unit 15 having a determination unit 14 for determining a wear state to be described later. . The calculation result in the calculation unit 15 is displayed on the display 16. As the display form, the calculation results can be displayed in a table, the charts shown in FIGS. 5 to 8, the distribution model diagram of the F / B intensity ratio, etc. can be displayed in color display, especially the F / B intensity. By displaying the ratio distribution model diagram in color, the F / B intensity ratio levels shown in FIGS. 5E and 7F can be visually discriminated by coloration.

  In the present embodiment, the horizontal distance L is 0.8 to 1.6 times the blast furnace hearth diameter when viewed from the bottom brick of the furnace bottom 2, and the elevation angle looking up the estimated brick remaining position in the center of the furnace bottom is 5 to 25 degrees. The measuring unit 12 is arranged at the position.

  The measurement unit 12 has a front detector 121 and a rear detector 122 having the same configuration as the front detector 121 arranged to face each other, and an iron plate 123 is arranged between the front detector 121 and the rear detector 122. It is configured.

  The front detector 121 and the rear detector 122 are arranged with m rows of first detection units 124 for detecting the horizontal direction extending in the vertical direction in the horizontal direction, and the second detection for detecting the vertical direction extending in the horizontal direction. The units 125 are arranged in n columns in the vertical direction, and the m rows of the first detection units 124 and the n columns of the second detection units 125 are arranged in the front-rear direction. The first detection unit 124 and the second detection unit 125 include, for example, a plastic scintillator that emits light by, for example, muon incidence in an aluminum case along the length direction, and a plurality of the rear side of the plastic scintillator. The photomultiplier tubes are arranged at an equal pitch along the length direction of the aluminum case.

  Therefore, when the plastic scintillator emits light, a pulse signal is output from the photomultiplier tube at a position behind the light emitting point. In this case, pulse signals are output from the first detection unit 124 and the second detection unit 125, respectively.

  Further, the positional relationship between the first detectors 124 and the second detectors 125 in the front detector 121 and the rear detector 122 is set in advance, and each row of the first detectors 124 arranged in the horizontal direction is For example, the distance in the radial direction from the center point of the blast furnace bottom 2 is known in advance, and the distance in the vertical direction with respect to a predetermined point on the blast furnace bottom 2 is known in advance for each row arranged in the vertical direction of the second detector 125. ing.

  Here, it is assumed that muon μ transmitted through the blast furnace bottom 2 is detected at a certain moment. Muon μ passes through the first detector 124 and the second detector 125 of the front detector 121, and muon μ that passes through the iron plate 123 passes through the rear detector 122. Focusing on the first detectors 124 arranged in m rows in the horizontal direction, the front detector 121 through which muon μ is transmitted is, for example, sixth from the left end, and the rear detector 122 is seventh from the left end. If there is, the incident angle of the muon μ in the horizontal direction is obtained, and the flying locus of the muon μ in the horizontal direction with respect to the blast furnace bottom is obtained.

  Focusing on the second detectors 125 arranged in n rows in the vertical direction, the front detector 121 through which muon μ is transmitted is, for example, the fourth from the bottom, and the rear detector 122 is the third from the bottom. If so, the elevation angle of the muon μ flying from the blast furnace side is obtained, and the flight locus in the elevation angle direction of the muon μ with respect to the blast furnace bottom 2 is obtained.

  These flying trajectories are various, and the muon μ arriving at the measuring unit 12 does not concentrate on one point of the measuring unit 12, but on the horizontal plane with respect to the blast furnace bottom 2, as shown in FIG. There are sparse and dense portions, and there are also intersecting portions. When such measurement is performed over a long period of time, the entire region of the furnace bottom 7 of the furnace bottom 2, the side walls 4, the bottom plate 3. It is possible to measure the muon μ that has passed through only. The same applies to the elevation direction.

  In addition, when the measurement part 12 is arrange | positioned upwards from the base 3 of the furnace bottom 2, since it cannot measure about the muon mu which permeate | transmitted the base 3 of the furnace bottom 2, in this Embodiment, the measurement part 12 is used. By arranging it at a position slightly below the bottom plate 3 of the furnace bottom 2, it is possible to measure the muon μ transmitted through the bottom plate 3 of the furnace bottom 2.

  In order to remove the background of a large amount of soft components (electrons, gamma rays, etc.) nearly tens of times that of muon, we used multiple generated signals created by soft components due to iron in the middle; The muon goes straight through the iron and gives a single signal to the rear (front) counter, but the soft component turns into a large number of particles and photons in the iron, so it gives multiple signals to the rear (front) counter.

  In the present embodiment, the intensity of muon μ flying from the blast furnace side is detected by the front detector 121 (hereinafter referred to as F intensity), and the muon μ not passing through the blast furnace is detected by the rear detector 122. Are also detected (hereinafter referred to as B intensity), and the values of the F intensity and B intensity are stored in the storage unit 13.

Since the F intensity of the muon μ measured by the front detector 121 passes through the blast furnace, the B intensity of the muon μ measured by the rear detector 122 without passing through the blast furnace is larger than the F intensity. In addition, the F strength transmitted through the furnace at the bottom 2 where the high density of pig iron is present is a refractory brick with a density lower than that of pig iron (density is about 7 g / cm ³ ). Needless to say, is less than the F intensity transmitted through about 2 g / cm ³ ). Then, when the F intensity is examined by comparison with the B intensity (F / B), which is the measured intensity of the muon μ that does not permeate the blast furnace, the flying trajectory that the muon μ permeates penetrates the inside of the furnace at the bottom 2 of the furnace. It is possible to determine whether there is a fire brick or only through it.

In this embodiment, paying attention to the fact that there is a correlation between the F / B intensity ratio and the density (Density) of the substance permeated by muon μ, the furnace inside the furnace bottom 2 is completely filled with iron. assumed, and a state 3,1.95g / cm ³ which was state 2,3.9g / cm ³ density of material (density) was state 1,5.85g / cm ^3, which was 7.8 g / cm ³ at that time For state 4, a distribution model of F / B intensity ratio in the bottom 2 is created based on Monte Carlo Simulation, and the density and F / B intensity ratio characteristics obtained in these states 1 to 4 are obtained. Getting a line.

  Here, the density in state 1 corresponds to, for example, iron, the density in state 2 corresponds to, for example, a mixture of coke and iron (the specific gravity of iron is large), and the density in state 3 corresponds to, for example, a mixture of coke and iron (coke The density in state 4 is a value close to that of refractory bricks, for example.

  FIGS. 5A to 5D show distribution models of the F / B intensity ratio in states 1 to 4, respectively. The X direction is the horizontal direction, the Y direction is the elevation direction, and the Z direction is the F / B intensity value. Is shown. In FIG. 5, the X direction is 0 (mrad) from the center point of the measuring section 12 to the outer peripheral surface of the furnace wall of the furnace bottom 2, as indicated by α in FIG. It shows a state of 1000 (mrad) scanning in the clockwise direction (the position connecting the center point of the measuring unit 12 and the center of the core is just 500 mrad), and the Y direction is 0 on the horizontal line as indicated by β in FIG. (Mrad), and a state of scanning up to an elevation angle of 500 (mrad) is shown.

  Although description of a method for creating an F / B intensity ratio distribution model by Monte Carlo simulation is omitted, the F / B intensity ratio distribution model diagrams shown in FIGS. The / B intensity ratio is expressed as a contour line, and the higher the F / B intensity ratio is, the higher the contour line is, so that each model diagram in FIG. 5 has a lower contour line from the periphery toward the center. In addition, since the furnace bottom structure such as the thickness of the bottom 3 of the furnace bottom 2 and the thickness of the refractory brick 5 on the side wall 4 has been known in advance, the position that becomes the boundary between the refractory brick and the hot metal after the start of operation is From the data of the furnace bottom 2, the position is set back from the surface of the refractory brick at the time of building. FIG. 5 (e) shows the relationship between the contour line and the F / B intensity ratio. When the F / B intensity ratio decreases from the top to the bottom, and this is shown by gradation by color, The top color is red, and the bottom color is dark blue, and the color changes between orange, yellow, yellow-green, green, and blue in order, and correspondingly, FIGS. 5 (a) to (d) ( In the distribution model diagram of the F / B intensity ratio in f), the contour lines on the outer peripheral side are shown in a warm color system, and the center is shown in a cold color system. In addition, the numerical value shown to a part of contour line of Fig.5 (a)-(d) (f) shows F / B intensity ratio value. The same applies to FIGS. 6 to 8 described later.

In FIG. 5 (a), the position of 500 (mrad) in the X direction is the center position in the horizontal direction of the furnace bottom 2, and the bottom plate is in the range of about 0 to 150 (mrad) which is substantially equal to the horizontal in elevation angle. Since it can be estimated that only the refractory brick 3 is transmitted, the F / B intensity ratio in this range shows a large value. When the elevation angle is further increased, the F / B intensity ratio tends to gradually decrease in the range of 150 to 200 (mrad). When the elevation angle reaches the range of 350 to 500 (mrad), the F / B intensity ratio is increased. Is greatly reduced. Here, since the elevation angle is 500 (mrad) and the horizontal direction is 500 (mrad), it is located above the surface of the bottom 3 of the furnace bottom 2, so the F / B intensity ratio at this position passes through pig iron. The F / B intensity ratio of this muon μ can be obtained, and the F / B intensity ratio at this position is 0.257. Thus, from FIG. 5 (a), the is a density of the packing in the furnace in a state 1 where the 7.8g / cm ^3, F / B intensity ratio at a density 7.8 g / cm ³ is given as 0.257.

In the distribution model of the F / B intensity ratio when the density of the packing in the furnace shown in FIG. 5 (b) is 5.85 g / cm ³ , a part existing in the center of the furnace at an elevation angle of 400 to 500 (mrad) The F / B intensity ratio is given as 0.341.

In the distribution model of the F / B intensity ratio when the density of the filling in the furnace shown in FIG. 5 (c) is 3.1 g / cm ³ , a portion existing in the center of the furnace at an elevation angle of 400 to 500 (mrad) The F / B intensity ratio is given as 0.426.

In the distribution model of the F / B intensity ratio when the density of the packing in the furnace shown in FIG. 5 (d) is 1.95 g / cm ³ , the part existing in the center of the furnace at an elevation angle of 400 to 500 (mrad) The F / B intensity ratio at is given as 0.554.

  Thus, FIG. 6 shows the relationship between the density and the F / B intensity ratio at each density.

FIG. 6 shows the F / B intensity ratio on the vertical axis and the density (g / cm ³ ) on the horizontal axis, and F / P obtained by plotting the four points shown in FIGS. 5 (a) to (d). A B intensity ratio-density characteristic line is shown.

  If the F / B intensity ratio of the actually measured muon intensity is determined by using the F / B intensity ratio-density characteristic line shown in FIG. 6, the density of the substance filled in the furnace in the furnace bottom 2 is determined. Can be estimated. This is based on the fact that the thickness of the refractory brick can be estimated if the boundary between the refractory brick and the filling in the furnace is known.

FIG. 5 (f) shows the distribution model of the F / B intensity ratio by Monte Carlo simulation based on the measured data of the flying trajectory of the muon μ measured by the measuring unit 12, the F value and the B value. In FIG. 5 (f), the lowest F / B intensity ratio is 0.341. In the characteristic line of FIG. 6, the density (g / cm ³ ) corresponding to the actually measured F / B intensity ratio of 0.341 is 6.3470.

Therefore, the density (g / cm ³ ) of the substance filled in the furnace at the furnace bottom 2 can be estimated as 6.3470. 6A is a distribution model diagram of the actual F / B intensity ratio shown in FIG. 5F, and FIG. 6B is a distribution model diagram of the F / B intensity ratio shown in FIG. 5D. It is.

  As described above, since the density of the material filled in the furnace of the furnace bottom 2 has been specified, the F / B intensity ratio of the muon μ that has permeated the material filled in the furnace and the F / B that has permeated the refractory brick. There is a clear difference in intensity ratio. If the position of the inner end face of the refractory brick at the time of building the furnace, for example, the amount of wear of the bottom board 3 of the furnace bottom 2 is confirmed, the height of the inner surface of the bottom board 3 at the time of building the furnace, If the amount of wear of the side wall 4 is confirmed, each of the F / B intensity ratios at a plurality of points entering the thickness direction of the refractory bricks from the inner surface position of the side wall 4 is the same as in FIG. 5 and FIG. In addition, by creating a distribution model of F / B strength ratio by Monte Carlo simulation, it is possible to obtain a characteristic line showing the relationship between F / B strength ratio-amount of wear of refractory bricks (existing thickness).

FIG. 7 is a diagram for explaining a method for measuring the amount of wear of the bottom plate 3 of the furnace bottom 2. FIG. 7A shows a state in which the bottom plate 3 is not worn. The positional relationship between the state (−50 cm) and the worn state (−100 cm) is shown. (B) to (d) are distributions of the F / B intensity ratio of muon μ for the three states shown in (a) above. A model diagram created by Monte Carlo simulation is shown, (b) shows a worn state of 0 cm, (c) shows a worn state of 50 cm, and (d) shows a worn state of 100 cm. In preparing the distribution model diagram of F / B intensity ratio by Monte Carlo simulation (b) to (d), the density (g / cm ³ ) of the substance in the furnace bottom 2 is obtained from the characteristic line shown in FIG. 6.347.

  The distribution model diagram of the F / B intensity ratio shown in (b) to (d) of FIG. 7 represents the F / B intensity ratio with contour lines in the same manner as (a) to (d) of FIG. The F / B intensity ratio indicated by the contour lines decreases from the side toward the center. Further, the X direction, the Y direction, and the Z direction are the same as those in FIG.

  7 (b) to (d), the position in the X direction is set to 500 (mrad) passing through the center of the furnace, and in any of (b) to (d), the furnace bottom brick is used on the detector side, and on the far side. If a constant light path (elevation angle) is selected in (b) to (d) that passes through the pig iron part in the furnace, the light path will cross the boundary between the bottom brick and the pig iron part in the furnace, and the brick Since the boundary is different depending on the amount of wear, the passing distance between the brick portion and the pig iron portion changes in each of (b) to (d), and the F / B strength ratio differs.

  The F / B strength ratio thus determined was 0.929 at a wear amount of 0 cm, 0.895 at a wear amount of −50 cm, and 0.87 at a wear amount of −100 cm. FIG. 7E shows a distribution model diagram of the F / B intensity ratio based on the actually measured values, which is the same as FIG. 5F.

  FIG. 8 shows an F / B strength ratio-abrasion amount characteristic diagram with the F / B strength ratio on the vertical axis and the wear amount on the horizontal axis. The above three data points (0.929 at 0 cm, 0.895 at −50 cm, It can be obtained by plotting 0.87) at -100 cm. The distribution model diagrams of the F / B intensity ratios shown in FIGS. 8B, 8C, and 8D are the distribution model diagrams of the F / B intensity ratios shown in FIGS. 7B, 7C, and 7D. It corresponds to each.

  FIG. 8A is a distribution model diagram of the F / B intensity ratio created based on the actual measurement values, and the distribution model of the F / B intensity ratio in FIGS. 5F, 6A, and 7E. It is the same as the figure.

  The F / B strength ratio-wear amount characteristic diagram obtained in this way is a distribution model diagram of F / B strength ratio created based on the actual measurement values shown in FIG. mrad), where the F / B intensity ratio in the Y direction is the largest, it indicates that muon μ penetrates only the refractory bricks, and this position fills the bottom 3 surface of the furnace bottom 2 and the furnace. Since the boundary with the substance is shown, if the F / B intensity ratio at this position is known, the amount of wear of the bottom plate 3 of the furnace bottom 2 is derived. The F / B intensity ratio at the boundary position with the substance filled in the furnace in the measured value in FIG. 8A was 0.914, and the amount of wear at that time was 20.734 cm.

  Creation of F / B intensity ratio distribution model by the above-mentioned Monte Carlo simulation described with reference to FIGS. 5 to 8, F / B intensity ratio-density characteristic line shown in FIG. 6, F / B intensity ratio shown in FIG. -Creation of a wear amount characteristic diagram, extraction of data from a distribution model of F / B intensity ratio of actual measurement values, processing for calculating density and wear amount from the extracted data is performed by the determination unit of the calculation unit 15 shown in FIG. 14 is executed.

  In the present embodiment, the entire area of the bottom plate 3 of the furnace bottom 2 is a measurement target, and as shown in FIGS. 1 and 2, a portion where a set of thermocouples 9a and 9b is disposed is covered. The boundary between the inside of the furnace and the refractory brick is determined at the position where the pair of thermocouples 9a and 9b specified from the coordinates of the horizontal angle and the elevation angle.

  When the boundary position d4 between the inside of the furnace and the refractory brick is determined, it is compared with the remaining thickness d3 based on the temperature measurement of the pair of thermocouples 9a and 9b shown in FIG. In FIG. 2B, the boundary position (remaining thickness) d4 is larger than the remaining thickness d3 based on the thermocouple temperature measurement. In this case, an estimated value of the remaining thickness is determined with reference to the remaining thickness d4 obtained using the muon μ.

  However, since it takes a week to month period to accurately estimate the remaining refractory thickness by muon μ measurement, muon measurement is used to estimate the long-term change in refractory residual thickness. For a short-term change in the furnace condition such as a change in the thickness of the deposit, a complementary in-furnace management method using temperature measurement with a thermocouple is possible.

  In the embodiment described above, the muon μ is used to determine the boundary between the inside of the furnace and the refractory brick over the entire furnace bottom 2. Refractory bricks obtained by the above-described method by arranging the measuring section 12 with the height, horizontal angle, elevation angle, etc. adjusted so as to aim only at the location where the thermocouple is disposed, with respect to the thermocouples 9a, 9b By applying this wear profile, the remaining thickness (wear amount) of the refractory bricks to be measured by the thermocouples 9a and 9b can be estimated with high accuracy. As described above, the F / B strength ratio is used to estimate the wear amount of the refractory bricks during the operation of the blast furnace even if it is not continuously monitored since the blast furnace was built. It depends.

  As a method for estimating the remaining thickness (amount of wear) of the refractory brick on the furnace bottom 2 using the muon μ, there are the following methods in addition to the method described above.

Second Embodiment FIG. 9 shows a second embodiment of the present invention.

  In the second embodiment, in order to measure the amount of wear of the bottom plate 3 of the furnace bottom 2, the measuring unit 12 is disposed on the furnace bottom base portion 8, and the muon μ passing through the bottom plate 3 of the furnace bottom 2 from above. Measure. In this case, the measurement unit 12 is installed so that the measurement surface is orthogonal to the vertical line and coincides with the horizontal plane. The measurement unit 12 is installed in the furnace bottom base 8 by being embedded at the time of building a furnace such as refurbishing the blast furnace 1.

  In the first embodiment described above, the rear detector 122 of the measuring unit 12 measures the incident angle (horizontal and vertical angles) of the muon μ reaching the measuring unit 12, and the front detector 121. And the role of obtaining the intensity of the muon μ that does not pass through the blast furnace 1 by measuring the intensity of the muon μ coming from the side opposite to the iron plate 123 side. As described above, when the measurement surface of the measurement unit 12 is installed so as to be orthogonal to the vertical line, the rear detector 122 of the measurement unit 12 embedded in the furnace bottom base 8 has a muon μ from the back side. Since it does not arrive, the B intensity cannot be measured.

  Therefore, in the present embodiment, the B intensity detector 124 is installed on the ground in order to measure the B intensity. For this B intensity detector 124, for example, one having the same configuration as the first detection unit 124 or the second detection unit 125 constituting the front detector 121 can be used, and the measurement plane is orthogonal to the vertical line. The muon μ that has passed through the blast furnace 1 does not arrive.

  Since the bottom plate 3 of the furnace bottom 2 can be directly observed as a whole by embedding the measuring unit 12 in the furnace bottom base 8 as in the second embodiment, the Monte Carlo simulation shown in FIGS. The accuracy of the distribution model diagram of the F / B intensity ratio obtained by the above is also increased, and the estimation accuracy of the amount of wear of the refractory brick of the bottom board 3 is further increased. Therefore, it is possible to reliably determine the boundary between the refractory brick 5 and the furnace in which the temperature is measured by the thermocouples 9a and 9b arranged at arbitrary locations on the bottom board 3.

  In the F / B intensity ratio distribution model diagrams shown in FIGS. 5 to 8, the X direction is the horizontal angle, the Y direction is the elevation angle, and the Z direction is the F / B intensity ratio. Then, the X direction is shown as an angle in the horizontal direction from the center of the furnace bottom 2, and the Y direction is shown as an angle with respect to the vertical line.

Third Embodiment In the first embodiment described above, the measuring unit 12 is installed at a position away from the blast furnace 1 in the horizontal direction, the muon μ that has passed through the furnace bottom 2 is measured at only one location, and the elevation angle is measured. By adding direction data, a distribution model diagram of the F / B intensity ratio is created three-dimensionally as shown in FIGS. 5 to 8 and the amount of wear of the bottom board 3 is measured.

  On the other hand, in the third embodiment, by measuring the muon μ that has passed through the furnace bottom 2 at a plurality of locations around the furnace bottom 2, not only the bottom board 3 but also the refractory brick and furnace of the side wall 4 are used. The boundary with the inside can be easily obtained two-dimensionally.

  Therefore, the distribution model diagram of the F / B intensity ratio obtained by the Monte Carlo simulation shown in FIG. 5 to FIG. 8 can be displayed in two dimensions, and the amount of wear of the refractory bricks on the bottom plate 3 or the side wall 4 of the furnace bottom 2 can be estimated with high accuracy. It can be done. Therefore, it is possible to determine the boundary position between the refractory brick and the furnace in which the thermocouples 9a and 9b are arranged with high accuracy.

  Here, as a method of measuring the muon μ that has passed through the furnace bottom 2 at a plurality of locations around the furnace bottom 2, for example, it can be realized by arranging a plurality of measuring units 12 around the furnace bottom 2. In this case, it is necessary to prepare as many measuring units 12 as the number of arrangement locations, and it is not necessary to measure muon μ simultaneously at a plurality of locations, and the measurement period of muon μ is long. It is also possible to measure by moving the unit 12 to a plurality of measurement locations.

  As described above, in each of the above-described embodiments, the muon μ that passes through the furnace bottom 2 and is measured by the measurement unit 12 follows various flight trajectories, and thus accumulates these data. Thus, it is possible to easily estimate the state of the inside of the furnace bottom 2, the bottom plate, and the side wall as two-dimensional using Monte Carlo simulation.

  By using the F / B intensity ratio, it is possible to know the density of the substance (there is one substance or a mixture of a plurality of substances) that muon μ has actually permeated. The state of the side wall can be expressed by the relationship between the F / B intensity ratio and the density. From this, if the density of the substance that seems to exist in the furnace can be estimated from the actually measured data, the boundary position between the substance in the furnace and the bottom plate or the side wall can be determined.

  In addition, since the density of materials in the furnace could be estimated based on the actual measurement values, for example, using refractory bricks at the time of building as a reference, the relationship between this reference value and a plurality of wear amounts and the F / B strength ratio can be obtained. For example, the wear amount of the refractory brick can be estimated from the F / B intensity ratio at the boundary position between the in-furnace material and the refractory brick in the actual measurement value.

  In this way, by using the F / B intensity ratio that can be information specific to the substance transmitted by muon μ, the intensity of muon μ measured at a specific incident angle is continued from the start of operation as in the past. This makes it possible to measure the amount of wear at a specific location even during the operation.

  Moreover, although the amount of wear of a refractory brick can be finally estimated from the characteristic line shown in FIG. 8, the refractory brick is shown in the distribution model diagram of the F / B intensity ratio of the actual measurement values shown in FIGS. It may be possible to indicate the boundary position between the refractory and the in-furnace material, or indicate the current retreated position from the initial position due to wear of the refractory bricks. In particular, as in the second embodiment and the third embodiment, in a method advantageous for creating a distribution model diagram of the F / B intensity ratio with high accuracy, there is a difference between refractory bricks and in-furnace materials. Display of the boundary position and the like can be performed with higher accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view explaining the blast furnace bottom management method by the 1st Embodiment of this invention. (A) is a plan view of FIG. 1 and a block diagram of a remaining thickness measuring device using a thermocouple, and (b) is a characteristic diagram showing a relationship between temperature and refractory brick thickness using a thermocouple. FIG. 3 is a perspective view showing a schematic configuration of a muon measuring apparatus shown in FIGS. 1 and 2. The figure which shows a muon's flight locus. (A) to (d) are F / B intensity ratio distribution model diagrams showing the relationship between the density and the F / B intensity ratio, with the density of the material in the furnace as a variable, and (e) is the F / B intensity ratio level. (F) is a distribution model diagram of F / B intensity ratio showing actual measurement values. FIG. 6 is a characteristic diagram showing the relationship between the F / B intensity ratio and the density, where (a) is a distribution model diagram of the F / B intensity ratio in actual measurement values, and (b) is the F / B shown in FIG. Distribution model of intensity ratio (A) is a longitudinal sectional view showing the wear amount of the bottom of the furnace bottom as a variable, (b) to (d) are F / B strength ratio distribution model diagrams showing the relationship between the wear amount and the F / B strength ratio, (E) is a distribution model diagram of F / B intensity ratio of measured values, and (f) is a diagram showing the level of F / B intensity ratio. FIG. 7 is a characteristic diagram showing the relationship between the F / B strength ratio and the amount of wear, where (a) is a distribution model diagram of F / B strength ratio of actual measurement values, and (b) to (d) are (b) to (b) of FIG. The distribution model figure of F / B intensity ratio shown to (d). The longitudinal cross-sectional view explaining the wear state confirmation method of the blast furnace bottom refractory by the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Blast furnace 2 Furnace bottom 3 Bottom board 4 Side wall 5 Refractory brick 6 Outlet 7 Furnace 8 Furnace bottom base part 9a, 9b Thermocouple 10a Remaining thickness calculator 10b Display unit 11 Measuring device 12 Measuring part 121 Front detector 122 Rear side Detector 123 Iron plate 124 First detection unit 125 Second detection unit 13 Storage unit 14 Determination unit 15 Calculation unit

Claims (6)

Estimating the remaining thickness of the hearth refractories in accordance with the measured temperature measured by the temperature measuring means arranged in the furnace bottom refractory in the blast furnace, and the furnace bottom refractory measured temperature by using a cosmic ray muons the boundary position estimated at the boundary position estimating means for estimating a boundary position between the furnace a blast furnace bottom management method that complements the remaining thickness,
The boundary position estimating means, the measuring unit for measuring cosmic rays muons, and the furnace bottom transparently woo Chusen muons intensity flying passes through the furnace bottom of a blast furnace, traveling direction of the furnace SokoToru over woo Chusen muon And the non-transparent cosmic ray muon intensity that does not penetrate the blast furnace for a certain period of time,
Based on the known information of densities of known information and furnace material density of the furnace bottom refractory sets a plurality of average density, furnace SokoToru over woo Chusen in the furnace bottom in each said mean density muon intensity and nontransparent Space Find the distribution model of the intensity ratio with the line muon intensity,
Using pre SL distribution model, the intensity ratio representing the average density relationship between the average of the intensity ratio of the area to be assumed boundary of the furnace bottom refractory and furnace materials - calculated density characteristic line,
The intensity ratio - using density characteristic line, identifies the average density corresponding to the intensity ratio between RosokoToru over woo Chusen muon intensity and nontransparent cosmic ray muons intensity in the stored measured data are the specific blast furnace bottom management method characterized by estimating the boundary position of the furnace bottom refractory and furnace material based on the average density. The residual thickness of the bottom refractory is estimated according to the temperature measured by the temperature measuring means arranged in the bottom refractory of the blast furnace, and the temperature of the bottom refractory measured using the cosmic ray muon is estimated. A blast furnace bottom management method for complementing the remaining thickness by the wear amount estimated by a wear amount estimation means for estimating a wear amount,
The wear amount estimation means includes a measurement unit that measures the cosmic ray muon, a furnace bottom transmitted cosmic ray muon intensity transmitted through the bottom of the blast furnace, and discrimination information of the flying direction of the cosmic ray muon. , Accumulated non-transparent cosmic ray muon intensity that does not penetrate the blast furnace for a certain period of time,
A plurality of average densities are set based on the known information on the density of the bottom refractory and the known information on the density of the in-furnace material, and the bottom transmitted cosmic ray muon intensity and the non-transmitted cosmic ray muon in the furnace bottom are set for each average density. Find a first distribution model of intensity ratio to intensity,
Using the first distribution model, an intensity ratio-density characteristic line representing a relationship between the average of the intensity ratio and the average density of a region assumed to be a boundary between the bottom refractory and the in-furnace material is obtained;
Using the intensity ratio-density characteristic line, specify the average density corresponding to the intensity ratio between the furnace bottom transmitted cosmic ray muon intensity and the non-transmitted cosmic ray muon intensity in the accumulated measured data,
A plurality of wear amounts are set, and a second distribution model of the intensity ratio between the bottom transmitted cosmic ray muon intensity and the non-transmitted cosmic ray muon intensity at the bottom of the furnace is determined for each amount of wear using the specified average density. Seeking
Using the second distribution model, a strength ratio-amount of wear characteristic line representing the relationship between the average of the strength ratio of the region assumed to be the boundary between the furnace bottom refractory and the in-furnace material and the amount of wear is obtained.
Using the intensity ratio-amount of wear characteristic line, the amount of wear corresponding to the intensity ratio between the bottom-transmitted cosmic ray muon intensity and the non-transmitted cosmic ray muon intensity in the accumulated measured data is identified, and the identified A blast furnace bottom management method, wherein the amount of wear is estimated as the amount of wear of a refractory at the bottom. The boundary position estimating means, measures the hearth transparently woo Chusen muons flying in through the furnace bottom of the blast furnace, outside the furnace of the blast furnace, to perform at a position spaced horizontally from the high furnace The blast furnace bottom management method according to claim 1, wherein the blast furnace bottom management method is provided. The boundary position estimating means, measures the hearth transparently woo Chusen muons flying in through the furnace bottom of the blast furnace, the furnace bottom refractory measured by the temperature measuring means as a measurement target, the furnace bottom 2. The blast furnace bottom according to claim 1 , wherein the boundary position of the measurement target is estimated two-dimensionally based on the measurement result at each measurement position at a plurality of locations around the same time or at different times. Management method. The boundary position estimating means, measures of cosmic-ray muons in the furnace bottom permeation flying passes through the furnace bottom of the blast furnace, blast furnace according to claim 1, characterized in that the furnace bottom base portion of the blast furnace Furnace bottom management method. 3. The blast furnace according to claim 2 , wherein the wear amount estimation means performs measurement of a cosmic ray muon transmitted through the bottom of the blast furnace and transmitted at the bottom of the blast furnace. Furnace bottom management method.

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