JP2010065308A - Method and device for measuring terrace length in blast furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for stably measuring a furnace terrace length in a blast furnace even in the case that measured values obtained by measuring the layer upper surface shape of charged materials include any noise. <P>SOLUTION: In the furnace radius at the prescribed position, a continuous function F of undecided coefficient, which regulates a presumed shape line PL fictionalized as one smooth line including the curve of the layer upper surface shape, has an almost horizontal straight line part (st), an inclined part (in) having a specified downward decline toward the furnace center and a curving part (cu) smoothly connecting the straight line part (st) and the inclining part (in) at a part, and the coefficient of the continuous function F is derived based on the measured values. Then, the presumed shape line PL is derived from this continuous function F, and a point of intersection (is) between the straight line part (st) and the inclining part (in) contained in this presumed shape line PL is derived, and the terrace length is derived based on the distance from this point of intersection (is) to the furnace wall. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for measuring a terrace length in a layer upper surface shape of a charge laminated in a blast furnace by repeatedly charging a charge such as ore and coke in the blast furnace.

  In order to stably maintain the operation of the blast furnace, it is important to maintain the shape of the top surface of the deposited layer of the charge, that is, the surface profile in an appropriate shape. Terrace length is known as one of the control values that quantitatively show this surface profile. The terrace length is a horizontal distance along the furnace radial direction of a horizontal or substantially horizontal region (terrace portion) formed in the vicinity of the furnace wall in the surface profile.

  In order to grasp the terrace length, the surface profile must be actually measured in a high-temperature blast furnace during operation. As a measuring instrument (measuring means) that measures a surface profile that is already used in a blast furnace that is already in operation, there is a microwave profile meter 12 as shown in FIG. The microwave profile meter 12 measures the height of the surface profile (depth from the microwave irradiation position) at a constant pitch along the furnace radius at a predetermined position by utilizing the reflection of the microwave.

  However, each measured value obtained by the above measurement is plotted with the furnace center axis as the Y axis and the furnace radius as the X axis, and the line obtained by connecting the plotted points is the actual surface profile. Different rugged shapes appear. This is because a partial protrusion or the like that happens when the charge is charged is present in the measured surface profile, and this protrusion or the like is included in the measurement value as noise.

  Therefore, a method described in Patent Document 1 has been developed as a method for deriving an accurate terrace length even if noise is included in a measurement value obtained by measurement with the measurement instrument. In this method, the depth to the surface profile is measured at a constant pitch along the furnace radius at a predetermined position by a measuring device such as a microwave profile meter, and noise is processed from the measurement value (depth data) obtained by this measurement. And the terrace length is derived. Noise is unevenness that occurs only on the measured furnace radius due to partial protrusions on the upper surface (surface profile) of the charge formed due to various causes during charging. Say.

Specifically, this terrace length measurement method is performed as follows. First, as shown in FIG. 14, the depth to the surface profile is measured at a constant pitch along the furnace radius at a predetermined position. A plurality of depth data obtained by this measurement are smoothed using a quadratic curve (y = px ² + qx + r) as shown in FIG. Next, as shown in FIG. 16, among the plurality of measurement points, using the depth data after the smoothing process at measurement points that are separated by n points (two points in FIG. 16) before and after measurement point i. A first-order differential approximation process based on the center difference is performed, and the inclination angle of the measurement point i is calculated. After the inclination angle of each measurement point is calculated in this way, as shown in FIG. 17, the inclination angle at each measurement point is scanned in order from the furnace center toward the furnace wall, and the inclination angle is set to a threshold value (FIG. The measurement point g which is less than 15 ° in 13 is detected. A linear equation (Y = PX + Q) is obtained by the least square method based on the measurement point g detected in this way and the inclination angle of the measurement point in the vicinity thereof, and a position G matching the threshold value is obtained. The horizontal distance l from this position G to the furnace wall is calculated as the terrace length.
JP 2003-73716 A

  However, in the above-described terrace length measurement method, the terrace length may not be calculated depending on the noise included in each depth data (each measurement value). This is because the processing for removing the influence of noise such as smoothing processing and first-order differential approximation processing is performed in the terrace length side determination method described above, but only depth data in which these processing are in a close positional relationship. This is considered to be because the process is performed using the above, and may not be possible depending on the magnitude or amount of noise.

  Therefore, in view of the above problems, the present invention provides a terrace length of a blast furnace that can stably measure the terrace length even if noise is included in the measurement value obtained by measuring the shape of the layer upper surface of the charge. It is an object of the present invention to provide a measuring method for the above and a measuring device for terrace length of a blast furnace.

  The inventors of the present invention have made extensive studies to solve the above problems, and as a result, have found the following.

  When analyzing data of a large number of surface profiles such as past performance data, in a blast furnace in operation, in any surface profile, the surface profile at a predetermined position of the furnace radius is a single smooth line having a curve ( When estimated by the estimated shape line), the horizontal or substantially horizontal part (straight line part) corresponding to the terrace part in the vicinity of the furnace wall and the straight line part on the furnace center side are located in this line. There is a tendency that a portion (inclined portion) having a certain downward slope appears.

  Therefore, based on this discovery, the inventors focused on an estimated shape line having a straight portion and a curved portion as a part thereof, a method for measuring the terrace length of the blast furnace having the following configuration, and the terrace length of the blast furnace. Created a measuring device.

  The method for measuring the terrace length of a blast furnace according to the present invention is a measurement that measures the terrace length in the top surface shape of the charge layered in the blast furnace by repeatedly charging the charge in the blast furnace. A measurement step in which the top surface shape of the layer at a furnace radius at a predetermined position is measured, and an estimated shape line that simulates the top surface shape of the layer as a single smooth line having a curve at the furnace radius at the predetermined position Has a straight or horizontal portion near the furnace wall in a part thereof, and an inclined portion that is located on the furnace center side of the straight portion and has a constant downward slope toward the furnace center. A shape line deriving step in which the shape line is derived based on the measurement value obtained by the measurement in the measurement step, and an extension line to the furnace center side of the straight portion and the inclination based on the derived estimated shape line With an extension to the furnace wall side A terrace length deriving step in which a point is derived and a terrace length is derived based on a distance from the intersection to the furnace wall. In the shape line deriving step, the estimated shape line is defined, and the straight line portion , A continuous function with an indeterminate coefficient is set in advance, and includes a curved portion that smoothly connects the inclined portion and the end portion on the furnace center side of the linear portion and the end portion on the furnace wall side of the inclined portion. The estimated shape line is derived by calculating the coefficient of the continuous function based on the measured value obtained in the step.

  According to such a configuration, the layer upper surface shape (hereinafter also referred to as “surface profile”) in the measuring means already used in the operating blast furnace in a situation where only limited measurement such as in the operating blast furnace is possible. Even if noise is included in a plurality of measurement values obtained by the measurement of (.), The terrace length can be easily and accurately derived based on these measurement values.

  Specifically, a coefficient undetermined continuous function that prescribes the estimated shape line at the predetermined furnace radius is set in advance, and each coefficient is calculated based on the plurality of measured values, and thus included in each measured value. Regardless of the magnitude or amount of noise generated, an estimated shape line is derived as a single smooth line having a curve. The surface profile at the predetermined position is simulated by this estimated shape line, so that even if there is a partial protrusion (noise) that happens to occur in the measured surface profile, the influence is suppressed, and the accuracy is improved. A good surface profile is obtained. In the present invention, a line means a finite length line having both ends.

  Further, in the obtained surface profile, since the straight portion and the inclined portion are included in a part thereof, the straight portion and the inclined portion are specified and the intersection of the extension lines is obtained. The accurate terrace length can be derived by a simple calculation such as obtaining the horizontal distance between the intersection and the furnace wall.

  In the method for measuring the terrace length of a blast furnace according to the present invention, the continuous function includes a straight section corresponding to the straight section arranged in order from the furnace wall toward the furnace center, a curved section corresponding to the curved section, and For a plurality of sections sectioned along the furnace radius at the predetermined position including the tilt section corresponding to the tilt section, each section function is defined by a plurality of section functions defined. , Each of the coefficient and the range in the furnace radial direction of the predetermined position is undetermined and set at the boundary between adjacent interval functions, and in the shape line derivation step, based on the measurement value obtained in the measurement step It is preferable that the estimated shape line is derived by calculating coefficients in all the interval functions and ranges in the furnace radial direction of the predetermined positions.

  According to this configuration, in addition to the straight section, the curved section, and the inclined section, the continuous function is further partitioned, and a section function that defines a line in accordance with the surface profile is set for each of the partitioned sections. This makes it possible to obtain the estimated shape line that more closely approximates the actual surface profile. As a result, the terrace length can be derived more accurately.

  The interval function is preferably a function represented on an xy plane in which the furnace center axis is the y axis and the furnace radius at the predetermined position is the x axis. By doing in this way, each interval function is expressed in the form of y = f (x), and handling of each interval function becomes easy. Therefore, it is easy to calculate the coefficient in each interval function based on the measured value of the profile and the range in the furnace radial direction of the predetermined position, and it is easy to derive the estimated shape line.

  The continuous function is defined by four section functions. In these four section functions, the line defined by the corresponding section function is a straight line corresponding to the straight line portion in order from the furnace wall toward the furnace center side. A first linear function, a first curve function in which the line becomes a curve corresponding to the curved portion, a second linear function in which the line becomes a straight line corresponding to the inclined portion, and a second in which the line becomes a curve The curve function is preferably

  According to such a configuration, regardless of whether or not charging of the charging material into the furnace center portion (central charging) is performed when a new charging material is charged into the blast furnace, 4 By connecting four lines respectively defined by two interval functions in series, it is possible to obtain the estimated shape line having a shape corresponding to the profile of the charge.

  Since the estimated shape line can be defined with such a small number of interval functions, it is easy to calculate the coefficient in each interval function based on the measured value of the profile and the range in the furnace radial direction of the predetermined position, and the estimation shape line can be derived. It becomes easy. Moreover, since the derived estimated shape line has a shape that conforms to the measured profile, the terrace length can be derived with high accuracy.

  In addition, when the central charging is not performed at the time of charging a new charge into the blast furnace, the continuous function is defined by three interval functions, and these three interval functions are: In order from the furnace wall toward the furnace center side, a first linear function in which a line defined by the corresponding section function becomes a straight line corresponding to the straight line part, and a curve function in which the line becomes a curve corresponding to the curved part. The second linear function in which the line is a straight line corresponding to the inclined portion may be used.

  In the case where the central charging is not performed in this way, only three lines respectively defined by fewer three section functions are connected in series, and the shape conforming to the shape of the top surface of the charge is obtained. An estimated shape line can be obtained. That is, the estimated shape line is composed only of the straight line portion, the curved portion, and the inclined portion, and the derivation of the estimated shape line becomes easier.

  The continuous function used to derive the estimated shape line may be changed depending on whether or not the center charging is performed. That is, in the shape line derivation step, the coefficient is undetermined as a continuous function that defines the estimated shape line, and is defined by four section functions, and these four section functions correspond in order from the furnace wall toward the furnace center side. A first linear function in which a line defined by the interval function is a straight line corresponding to the straight line portion, a first curved function in which the line is a curve corresponding to the curved portion, and the line corresponds to the inclined portion. It is defined by a second linear function that is a straight line, a first continuous function that is a second curve function that is a curved line, and three interval functions, and these three interval functions are moved from the furnace wall to the furnace center side. In turn, a third linear function in which a line defined by the corresponding interval function becomes a straight line corresponding to the straight line portion, a third curved function in which the line becomes a curve corresponding to the curved portion, and the line is A straight line corresponding to the inclined portion Two continuous functions, a second continuous function, which is a fourth linear function, are set in advance, and when the new charge is charged into the blast furnace, the charge is charged into the furnace center. When charging is performed, the coefficient of the first continuous function is calculated based on the measured value obtained in the measuring step, the estimated shape line is derived, and the charge to the furnace center is derived. When charging is not performed, the estimated shape line may be derived by calculating a coefficient of the second continuous function based on the measurement value obtained in the measurement step.

  With this configuration, calculation is facilitated when the center charging is not performed, and the estimated shape line is derived using the four interval functions regardless of the presence or absence of the center charging. Compared to the case, it is possible to obtain an estimated shape line having a shape that conforms to the profile of the charge easily and in a short time.

  The first curve function, the second curve function, the third curve function or the curve function is a function having a constant angle change rate with respect to the x-axis represented by the following equation (1), or It is preferable that it is a quadratic function represented by the formula (2).

y = (− 1 / a) · log | cos (ax + b) | + c (1)
y = αx ² + βx + γ (2)
Here, a, b, c, α, β, and γ are coefficients.

  According to this configuration, each of the first curve function, the second curve function, the third curve function, and the curve function is a simple function and has few coefficients, so that each interval function based on the measurement value is used. It is easier to calculate the coefficient and the range in the x-axis direction.

  In the shape line derivation step, it is preferable that the steepest descent method is used from the measurement values obtained in the measurement step, and the coefficients in all the interval functions and the ranges in the x-axis direction are obtained simultaneously.

  According to this configuration, the coefficients of all the interval functions and the ranges in the x-axis direction can be easily obtained from the measured values at the same time.

  Further, in order to solve the above-mentioned problem, the apparatus for measuring the terrace length of a blast furnace according to the present invention repeats the charging of the charge in the blast furnace, and the upper surface of the charge layer stacked in the blast furnace. A measuring device for measuring a terrace length in a shape, the terrace length deriving means for deriving the terrace length based on a measured value obtained by measuring the shape of the upper surface of the layer of the charge at a furnace radius at a predetermined position And output means for outputting the terrace length value derived by the terrace length deriving means to the outside, wherein the terrace length deriving means curves the shape of the upper surface of the layer at the furnace radius at the predetermined position. A continuous function with an undetermined coefficient that defines an estimated shape line that simulates as a single smooth line has a horizontal or substantially horizontal straight line portion near the furnace wall and the furnace center side of this straight line portion at the furnace center. Constant downward slope toward And a curved portion that smoothly connects the end portion on the furnace center side of the linear portion and the end portion on the furnace wall side of the inclined portion, and this coefficient undetermined continuous function is stored in advance. A function storage unit that stores the coefficient of the continuous function stored in the function storage unit based on the measurement value, and a coefficient calculation unit that stores the continuous function in which the calculated coefficient is substituted, An estimated shape line is derived based on the continuous function stored in the coefficient calculation unit, and based on the estimated shape line, an extension line to the furnace center side of the straight portion and an extension line to the furnace wall side of the inclined portion The intersection point deriving unit for deriving the intersection point of the intersection and storing the position information of the intersection point, and the terrace length is derived based on the distance from the intersection point where the position information is stored in the intersection point deriving unit to the furnace wall. A terrace length deriving unit for transmitting the terrace length value to the output means; Characterized in that it.

  According to such a configuration, if measurement values at a plurality of locations in the profile along the furnace radius at the predetermined position are obtained by measurement means or the like that is already used in a blast furnace that is already in operation, noise is included in these measurement values. However, the terrace length can be derived easily and accurately, while the derived terrace length is output by the output means, so that an operator operating the blast furnace can quickly and accurately. It becomes possible to grasp the terrace length.

  In the blast furnace terrace length measuring apparatus according to the present invention, the continuous function stored in the function storage unit is on an xy plane having a furnace center axis as a y axis and a furnace radius at the predetermined position as an x axis. The x axis including a straight line section corresponding to the straight line portion that is arranged in order from the furnace wall toward the furnace center side, a curved line section corresponding to the curved line section, and an inclined section corresponding to the inclined section. A plurality of types of interval functions defined for each of the plurality of intervals divided along the line are defined, and these types of interval functions are adjacent to each other with their coefficients and the x-axis direction range being undetermined. The coefficient calculation unit is set so as to be continuous at the boundary between the interval functions, and the coefficient calculation unit determines the coefficients in all interval functions that define the continuous function stored in the function storage unit based on the measurement value and the x-axis direction. of It calculates the circumference, configured to derive the estimated shape lines are preferred.

  According to such a configuration, the continuous function is divided into sections other than the straight section, the curved section, and the slope section, and the section function that defines a line according to the profile is set for each section. Thus, the estimated shape line approximated to the profile is obtained, and the terrace length can be derived with higher accuracy.

  Also, the terrace length deriving means is an input for inputting information as to whether or not charging of the charging material into the furnace center has been performed when charging a new charging material into the blast furnace. At least one of the receiving unit to which information on whether or not the charging of the charging unit or the charging material to the furnace center has been performed is transmitted from the outside, and charging information for storing the input or transmitted information A storage section, and the function storage section is defined by four section functions, and the four section functions are defined by the corresponding section functions in order from the furnace wall toward the furnace center side. Is a first linear function that is a straight line corresponding to the straight line portion, a first curve function that is a curve corresponding to the curved portion, and a second linear function that is a straight line that corresponds to the inclined portion. A function, a first continuous function which is a second curve function in which the line becomes a curve, and three A third linear function in which these three section functions are in order from the furnace wall toward the furnace center side, and a line defined by the corresponding section function becomes a straight line corresponding to the straight section, Two continuous functions are stored in advance: a third curve function in which a line is a curve corresponding to the curved portion, and a second continuous function that is a fourth linear function in which the line is a straight line corresponding to the inclined portion. And the coefficient calculation unit, based on the information stored in the charging information storage unit, when charging the core of the charging material is performed, based on the measured value, A coefficient of the first continuous function stored in the function storage unit is calculated, a first continuous function obtained by substituting the calculated coefficient is stored, and charging of the charge into the core is performed. If not, stored in the function storage unit based on the measured value A coefficient of the second continuous function is stored, a second continuous function into which the calculated coefficient is substituted is stored, and the intersection derivation unit is configured to store the first continuous function stored in the coefficient calculation unit or The configuration may be such that the estimated shape line is derived based on the second continuous function.

  According to such a configuration, the presence or absence of the central charging is input by an operator operating the blast furnace or transmitted from a control unit or the like of the blast furnace, and an estimated shape line having a shape corresponding to the surface profile can be derived in a shorter time. As described above, the continuous function used in the coefficient calculation unit is switched.

  The blast furnace terrace length measuring device measures the top surface shape of the charge at the furnace radius at the predetermined position, and transmits the measurement value obtained by this measurement to the terrace length deriving means. Measuring means for performing may be further provided.

  As described above, according to the present invention, the terrace length measurement method for a blast furnace that can stably measure the terrace length even if noise is included in the measurement value obtained by measuring the layer upper surface shape of the charge. , And an apparatus for measuring the terrace length of a blast furnace.

  Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings.

  The blast furnace terrace length measuring device (hereinafter also referred to simply as “measuring device”) is horizontal or substantially horizontal formed near the furnace wall on the top surface of the charge layered in the blast furnace. This is for measuring the terrace length (see FIG. 2), which is the horizontal distance along the furnace radial direction of the area (terrace portion). This terrace length is one of the control values that quantitatively indicate the surface profile, and keeps the top surface shape (surface profile) of the deposited layer of the charge to an appropriate shape to maintain stable operation of the blast furnace. Used for.

  Specifically, as shown in FIG. 1, the measuring apparatus includes a measuring unit 12, a terrace length deriving unit 20, and an output unit 14.

  The measuring means 12 measures a surface profile at a furnace radius at a predetermined position, and transmits (transmits) a measurement value obtained by this measurement to the terrace length deriving means 20 by an output signal. A so-called microwave profile meter is used. As shown in FIG. 2, the measuring means 12 has a measuring rod 12a inserted from the outside of the furnace so as to penetrate the furnace wall. And the measuring part 12b at the tip of this measuring rod 12a reciprocates along the furnace radial direction at a predetermined position of the furnace, and based on the reflected wave of the microwave irradiated from the tip (measuring part) 12b, The height of the top surface of the layer (profile depth) is measured. The measuring means 12 is provided in the measuring device 10 in the present embodiment. For example, when a microwave profile meter is already provided in the blast furnace, this is measured by the measuring means 12 of the measuring device 10. It may be used as

  The terrace length deriving unit 20 derives the terrace length based on the measurement value obtained by the measurement of the surface profile by the measuring unit 12, and includes a function storage unit 22, a coefficient calculation unit 24, and an intersection deriving unit 26. And a terrace length deriving unit 28.

  The function storage unit 22 has a coefficient undetermined continuous function F (see FIG. 3) that defines an estimated shape line PL (see FIG. 6) that simulates the surface profile as a single smooth line having a curve at the furnace radius at a predetermined position. Is a part for storing In the present embodiment, a single smooth line is composed of a straight portion and a curved portion without a bent portion, and can be differentiated at the connection position of each part (for example, the straight portion and the curved portion). It is a line that seems to be continuous.

  This continuous function F whose coefficient is undetermined is obtained as a result of analyzing surface profile data in the blast furnace under various operating conditions such as past performance data. Specifically, in any operating blast furnace, if the surface profile at the furnace radius at a predetermined position is simulated by a single smooth line having a curve (estimated shape line PL) in any surface profile, In the line, a horizontal or substantially horizontal portion (straight portion st) corresponding to the terrace portion in the vicinity of the furnace wall, and a portion that is located on the furnace center side of the straight portion and has a constant downward slope toward the furnace center It is a function set paying attention to the fact that (inclined part in) tends to appear.

  The continuous function F set in this way is a function represented on the XY plane in which the furnace center axis is the Y axis and the furnace radial direction at a predetermined position is the X axis. As shown in FIG. A part st, an inclined part in, and a connecting curve part cu that smoothly connects the linear part st and the inclined part in are included. Here, the straight line portion st is a horizontal or substantially horizontal portion in the vicinity of the furnace wall among the lines defined by the continuous function F, and the inclined portion in is a line defined by the continuous function F. This is a part that is located on the furnace center side of the straight part st and has a constant downward gradient toward the furnace center. Moreover, the connection curve part cu is a part which smoothly connects the furnace center side end part of the straight line part st of the continuous function F and the furnace wall side end part of the inclined part in. The slope and length of the straight line part st, the slope and length of the inclined part in, and the shape of the connecting curve part cu are not determined because they differ for each surface profile, but the surface profile is measured by the measuring means 12. Each coefficient is determined by calculating the coefficient of the continuous function F based on the obtained plurality of measurement values, and an estimated shape line PL approximate to the actual surface profile can be obtained.

  Specifically, the continuous function F is defined by connecting a plurality of types of section functions defined for each of four sections (a plurality of sections) partitioned along the X-axis direction. That is, at the boundary position of each interval function, the interval functions are connected so as to be differentiable. These plural types of interval functions are set so that the coefficient and the range in the X-axis direction are undecided and are continuous at the boundary between adjacent interval functions. In the present embodiment, the continuous function F corresponds to a straight line section L1 corresponding to a straight section, a connection curve section L2 corresponding to a connection curve section, and an inclined section from the furnace wall toward the furnace center along the X axis. It is divided into four sections, an inclined section L3 and an end curve section L4 at the furnace center side end. Regarding these four sections, the four section functions defined respectively are the first primary functions in which the line defined by the corresponding section function becomes a straight line corresponding to the straight line portion st in order from the furnace wall toward the furnace center side. A function f1, a first curve function f2 in which the line is a curve corresponding to the connection curve part cu, a second linear function f3 in which the line is a straight line corresponding to the inclined part in, and the line is a curve. And a second curve function f4.

More specifically, the interval functions f1 to f4 are expressed as follows:
y = e ₁ x + f ₁ (hereinafter, also simply referred to as “Expression (10)”)
And the second linear function f3 is
y = e ₂ x + f ₂ (hereinafter also simply referred to as “Expression (12)”)
It is represented by The first curve function f2 is
y = (− 1 / a) · log | cos (ax + b) | + c (hereinafter also simply referred to as “expression (11)”)
And the second curve function f4 is
y = αx ² + βx + γ (hereinafter also simply referred to as “Expression (13)”)
It is represented by Note that a, b, c, e ₁ , e ₂ , f ₁ , f ₂ , α, β, and γ are coefficients.

  Hereinafter, in the furnace radius (X axis) at the predetermined position, the boundary position between the straight section L1 and the connection curve section L2 is r1, the boundary position between the connection curve section L2 and the inclination section L3 is r2, and the inclination section L3. And the boundary position between the end curve section L4 and r3.

  The coefficient calculation unit 24 is a part that calculates the coefficient of the continuous function F stored in the function storage unit 22 based on the measurement value, and stores the continuous function F into which the calculated coefficient is substituted. Note that the calculation of the coefficient of the continuous function F in the present embodiment refers to obtaining the coefficient of each interval function that defines the continuous function F and the range in the X-axis direction of each interval function.

  The intersection deriving unit 26 derives the estimated shape line PL based on the continuous function F stored in the coefficient calculating unit 24, and based on the estimated shape line PL, the furnace center side extension line of the straight line portion st and the inclined portion in This is a part for deriving an intersection point is (see FIG. 7) with the extension line on the furnace wall side and storing information of the derived intersection point is.

  The terrace length deriving unit 28 derives the terrace length based on the distance from the intersection is where the position information is stored in the intersection deriving unit 26 to the furnace wall, and uses the derived terrace length value as an output signal. This is the part that transmits (transmits) to the output means 14.

  The output means 14 is for receiving the output signal transmitted from the terrace length deriving means 20 and outputting it to the outside. In the present embodiment, a CRT display is used as the output means 14. However, the present invention is not limited to this, and other display means such as an FPD may be used, or a printing means or the like may be used. A combination of these may also be used.

  The measuring apparatus 10 according to the present embodiment has the above-described configuration. Next, the operation of the measuring apparatus 10 will be described with reference to FIGS. 4 to 7.

  The surface profile at a predetermined furnace radius is measured by the measuring means 12, and the measurement value obtained by this measurement is transmitted as an output signal to the terrace length deriving means 20 (coefficient calculating section 24) (step 1). In this embodiment, measurement is performed at intervals of 10 cm from the furnace wall to the furnace center along the furnace radius (X axis) at a predetermined position. At this time, since the furnace radius of the blast furnace is 3.5 m, measurement values (depth data) of the heights of the 33 upper layers at equal intervals on the X axis are obtained (see FIG. 5).

  The coefficient calculation unit 24 that has received the output signal applies the continuous function F (see FIG. 3) stored in the function storage unit 22 to the measured value obtained by the output signal, so that the coefficient of the continuous function F is applied. Is derived (step 2).

  At this time, the coefficients in all the interval functions f1 to f4 of the continuous function F and the ranges in the X-axis direction are calculated as follows based on the measured values measured along the surface profile.

The coefficient (parameter) value of the continuous function F is determined so that the continuous function F best matches the measured value. Specifically, the furnace radius position at an arbitrary measurement point is X _i , the actual surface profile measurement value at the furnace radius position is Y _i, and the continuous function F at the furnace radius X is Y = F (X). Then
Σ {Y _i −F (X _i )} ²
Is a parameter of the continuous function F (coefficients e ₁ and f _{1 in} the above equation (10), coefficients a, b and c in the above equation (11), and a coefficient e in the above equation (12). ₂ , f ₂ , and the coefficients α, β, γ of the above equation (13) and the section in which the function is defined (the boundary position r1 between the straight line section L1 and the connection curve section L2, the connection curve section L2 and the slope section) The boundary position r2 with L3 and the boundary position r3 between the inclined section L3 and the end curve section L4) are simultaneously obtained by the steepest descent method which is one of nonlinear optimization techniques. Thus, by using the steepest descent method, it is possible to easily obtain the coefficients in all the interval functions f1 to f4 and the range (interval) in the X-axis direction in which each function is defined.

  The coefficient calculation unit 24 stores the continuous function F into which the coefficients of the interval functions f1 to f4 thus obtained and the range in the X-axis direction are substituted.

  Based on the continuous function F stored in the coefficient calculation unit 24, the intersection deriving unit 26 derives an estimated shape line PL (see FIG. 6) (step 3). As described above, the coefficient of the continuous function F is calculated based on a plurality of measurement values obtained by measuring the surface profile by the measuring unit 12, and thereby the gradient and length of the straight line portion st, the gradient of the inclined portion in, The length and the shape of the connecting curve part cu are determined, that is, the coefficient of each interval function and the range in the X-axis direction are determined, respectively, and an estimated shape line PL approximating the actual surface profile can be obtained.

  Further, the intersection derivation unit 26 derives an estimated shape line PL as a single smooth line having a curve, and simulates the surface profile in the X axis, thereby causing a partial protrusion that occurs in the surface profile in the X axis. Even if there is noise (noise), the influence is suppressed regardless of the magnitude and amount of noise included in each measurement value, and a highly accurate surface profile is obtained.

  Next, the intersection deriving unit 26 specifies the straight line portion st and the inclined portion in from the estimated shape line PL, and then extends the straight portion st to the furnace center side and the extended line to the furnace wall side of the inclined portion in. Is obtained (see FIG. 7), and the position information of the intersection is on the X-axis is stored (step 4).

  The terrace length deriving unit 28 derives the horizontal distance from the intersection is where the position information is stored in the intersection deriving unit 26 to the furnace wall, and the horizontal distance is set as the terrace length value to the output means 14 by the output signal. Transmit (step 5). Thus, by setting the horizontal distance from the intersection of the extension line on the furnace center side of the straight part st of the estimated shape line PL and the extension line to the furnace wall side of the inclined part in to the furnace wall as the terrace length, It is possible to derive a reasonable terrace length.

  The output means 14 that has received this output signal displays the value (step 6). Based on this display, the operator who operates the blast furnace can quickly and accurately grasp the terrace length.

  As described above, by calculating each coefficient of the continuous function F having the straight part st, the connecting curve part cu, and the inclined part in from the measured values of the surface profile and deriving the estimated shape line PL, An accurate surface profile can be obtained even if noise is included in the measurement value, and an accurate terrace length can be derived from this profile.

  In addition, the estimated shape line PL is derived, and the lengths and gradients (coefficients of the corresponding section functions and ranges in the X-axis direction) of the straight line part st and the inclined part in are determined, respectively. It is possible to derive an accurate terrace length by a simple calculation such as determining the intersection is between the extended lines by specifying the slope in and the horizontal distance between the intersection is and the furnace wall. Become.

  Next, a second embodiment of the present invention will be described with reference to FIG. 8. The same reference numerals are used for the same components as those in the first embodiment, and a detailed description thereof will be omitted. Only different components will be described in detail. explain.

  The terrace length deriving unit 20 of the measuring apparatus 110 according to the present embodiment further includes an input unit 30 and a charging information storage unit 32.

  The input unit 30 is a terrace length deriving unit for determining whether or not charging of the charge into the furnace center (center charging) has been performed when a new charge is charged into the blast furnace. This is a part to be input to 20, and is composed of a keyboard, a touch panel, and the like. The terrace length deriving unit 20 is not limited to the configuration in which the information indicating whether or not the charging material has been charged into the furnace center is input from the input unit 30, and the terrace length deriving unit. A receiving unit may be provided at 20, and the receiving unit may be connected to a blast furnace control unit or the like so that an information signal indicating the presence or absence of central charging transmitted from the control unit or the like may be received.

  The charging information storage unit 32 is a part in which information on the presence / absence of central charging input from the input unit 30 is stored. In addition, when the reception unit is provided in the terrace length deriving unit 20, the charging information storage unit 32 can also store information on the presence / absence of central charging received by the receiving unit from the control unit or the like. .

  The function storage unit 22a stores two continuous functions whose coefficients are undetermined. Specifically, in addition to the first continuous function F1 defined by the four interval functions f1 to f4 as in the first embodiment, the second continuous function F2 defined by the three interval functions f11 to f13 is Stored.

  As shown in FIG. 9, the second continuous function F2 is a function represented on the XY plane with the furnace center axis as the Y axis and the furnace radial direction at a predetermined position as the X axis. Like the function F1, the straight line portion st, the inclined portion in, and the connecting curve portion cu that smoothly connects the straight line portion st and the inclined portion in are included.

  Specifically, the second continuous function F2 is defined by connecting a plurality of types of section functions defined for three sections divided along the X-axis direction. The second continuous function F2 includes a straight section L1 corresponding to the straight section, a connection curve section L2 corresponding to the connection curve section, and an inclination section L3 corresponding to the tilt section from the furnace wall toward the furnace center along the X axis. Are divided into three sections. That is, the second continuous function F2 is divided so as to be smaller than the first continuous function F1 by the end curve section L4. For these three sections, the three section functions respectively defined are the third primary functions in which the line defined by the corresponding section function is a straight line corresponding to the straight line portion st in order from the furnace wall toward the furnace center side. A function f11, a third curve function f12 in which the line becomes a curve corresponding to the connection curve part cu, and a fourth linear function f13 in which the line becomes a straight line corresponding to the inclined part in.

More specifically, the third linear function f11 is
y = e ₁₁ x + f ₁₁ (hereinafter, also simply referred to as “formula (110)”)
And the fourth linear function f13 is
y = e ₁₂ x + f ₁₂ (hereinafter also simply referred to as “formula (112)”)
It is represented by The third curve function f12 is
y = (− 1 / a ₁ ) · log | cos (a ₁ x + b ₁ ) | + c ₁ (hereinafter, also simply referred to as “expression (111)”)
It is represented by A ₁ , b ₁ , c ₁ , e ₁₁ , e ₁₂ , f ₁₁ , f ₁₂ are coefficients.

  The coefficient calculation unit 24a calculates one of the coefficients of the first continuous function F1 or the second continuous function F2 based on the information on the presence / absence of central charging stored in the charging information storage unit 32, The continuous function F1 or F2 into which the calculated coefficient is substituted is stored.

  The measuring apparatus 110 according to the present embodiment has the above-described configuration. Next, the operation of the measuring apparatus 110 will be described with reference to FIGS. 10 to 7.

  When a new charge is charged into the blast furnace, whether or not the central charge is performed by an operator operating the blast furnace is input from the input unit 30 to the measuring apparatus 110, and a charge information storage unit 32 (step 0).

  Next, the surface profile at a predetermined furnace radius of the newly charged material is measured by the measuring unit 12, and the measured value obtained by this measurement is the terrace length deriving unit 20 (coefficient calculating unit 24). Is transmitted by an output signal (step 1). In the present embodiment, when center charging is performed, the heights of 33 layer top surfaces are measured at equal intervals on the X-axis as in the first embodiment (see FIG. 5). If not, the heights of the 18 layer upper surfaces are measured at equal intervals on the X axis (see FIG. 11).

  Note that the number of measurement points on the X-axis does not need to be changed depending on whether or not central charging is performed as in the present embodiment, but is large because the derived terrace length becomes more accurate. Is preferred.

  The coefficient calculation unit 24a that has received the output signal stores the measured value obtained from the output signal in the function storage unit 22a based on the information on the presence / absence of central charging stored in the charging information storage unit 32. By applying the first continuous function F1 (see FIG. 3) or the second continuous function F2 (see FIG. 9), the coefficient of the continuous function F1 or F2 is derived (step 2a).

  Specifically, the coefficient calculation unit 24a, when the information stored in the charging information storage unit 32 is information on the central charging of the charging material, is obtained by measurement by the measuring unit 12. Based on the value, the coefficient of the first continuous function F1 is calculated by the steepest descent method as in the first embodiment, and the first continuous function F1 to which this coefficient is substituted is stored. On the other hand, when the information stored in the charging information storage unit 32 is information in which the central charging of the charging material has not been performed, the second continuous function is based on the measurement value obtained by the measuring unit 12. The coefficient of F2 is calculated by the steepest descent method, and the second continuous function F2 substituted with this coefficient is stored.

  The intersection deriving unit 26 derives the estimated shape line PL based on the continuous function F1 or F2 stored in the coefficient calculating unit 24a (see FIG. 6 or 12) (step 3). As described above, the coefficient of the continuous function F is calculated based on a plurality of measurement values obtained by measuring the surface profile by the measuring unit 12, and thereby the gradient and length of the straight line portion st, the gradient of the inclined portion in, The length and the shape of the connecting curve part cu are determined, that is, the coefficient of each interval function and the range in the X-axis direction are determined, respectively, and an estimated shape line PL approximating the actual surface profile can be obtained.

  Further, the intersection derivation unit 26 derives the estimated shape line PL as a single smooth line having a curve, and simulates the surface profile on the X axis, so that it happens to be the surface profile on the X axis as in the first embodiment. Even if there is a partial protrusion or the like that occurs (noise), the influence is suppressed regardless of the magnitude or amount of noise included in each measurement value, and a highly accurate surface profile can be obtained.

  In addition, the presence or absence of central charging is input by an operator operating the blast furnace, and the continuous function F1 or F2 in which the coefficient is calculated in the coefficient calculation unit 24a is switched, so that the accurate and short time can be obtained according to the charging situation. It is possible to derive the estimated shape line PL at.

  That is, when center charging is not performed, the coefficient calculation unit 24a has a second continuous number that approximates an actual surface profile although the number of interval functions is smaller than when center charging is performed. The calculation time is shortened by selecting the function F2 and deriving the coefficient of the second continuous function F2.

  Next, the intersection deriving unit 26 specifies the straight line portion st and the inclined portion in from the estimated shape line PL, and then extends the straight portion st to the furnace center side and the extended line to the furnace wall side of the inclined portion in. Is obtained (see FIG. 7 or FIG. 13), and the positional information on the X axis of this intersection is is stored (step 4).

  The terrace length deriving unit 28 derives the horizontal distance from the intersection is where the position information is stored in the intersection deriving unit 26 to the furnace wall, and the horizontal distance is set as the terrace length value to the output means 14 by the output signal. Transmitting (step 5), the output means 14 receiving this output signal displays the value (step 6).

  Note that the blast furnace measuring apparatus of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

  In the first and second embodiments, the continuous function F or the first continuous function F1 defined by the four interval functions f1 to f4 are used, but in the blast furnace that performs the operation without central charging. In the measurement apparatus used, the continuous function stored in the function storage unit 22 is configured to store only the second continuous function F2 defined by the three interval functions f1 to f3 (or f11 to f13). May be.

  In the case where the central charging is not performed in this way, only three lines respectively defined by fewer three interval functions f1 to f3 (or f11 to f13) are connected in series, It is possible to obtain an estimated shape line PL having a shape conforming to the surface profile. Therefore, the calculation of the coefficient of the second continuous function F2 (the coefficient of each interval function and the range on the X axis of each interval function) is facilitated, and as a result, the time for deriving the terrace length is shortened.

  In the present embodiment, the continuous function F (or the first continuous function F1) is defined by the above formulas (10) to (13) being sequentially connected from the furnace wall to the furnace center side. It is not necessary to be limited to this. That is, the continuous function F may be any one of the straight line section L1 to the end curve section L4, and the connection curve section L2 may be the expression (11) or the expression (13). Any expression (13) may be used. Further, the second continuous function F2 may be such that the connection curve section L2 is the expression (111) or the expression (13).

It is a block diagram of the measuring device of terrace length of a blast furnace concerning a 1st embodiment. It is the schematic of the measuring means of the measuring apparatus of the terrace length of the blast furnace concerning the embodiment. It is a figure which shows the continuous function in the terrace length measuring apparatus of the blast furnace which concerns on the same embodiment, and its section function. It is a figure which shows the flow of operation | movement in the measuring apparatus of the terrace length of the blast furnace which concerns on the same embodiment. It is the figure which plotted the measured value by the measuring means of the measuring apparatus of the terrace length of the blast furnace concerning the embodiment on XY coordinates. It is a figure which shows the estimated shape line derived | led-out by applying the continuous function to the measured value in the measuring apparatus of the terrace length of the blast furnace which concerns on the same embodiment. It is a figure which shows the intersection of the extension lines of a linear part and an inclination part in the measuring apparatus of the terrace length of the blast furnace which concerns on the same embodiment. It is a block diagram of the measuring device of terrace length of a blast furnace concerning a 2nd embodiment. It is a figure which shows the 2nd continuous function and its area function in the terrace length measuring apparatus of the blast furnace which concerns on the same embodiment. It is a figure which shows the flow of operation | movement in the measuring apparatus of the terrace length of the blast furnace which concerns on the same embodiment. In the measuring apparatus of terrace length of the blast furnace concerning the embodiment, it is the figure which plotted the measured value by the measurement means in case center charging is not performed on XY coordinates. In the measuring apparatus of terrace length of the blast furnace concerning the embodiment, it is a figure which shows the estimated shape line derived | led-out by applying a continuous function to the measured value when center charging is not performed. It is a figure which shows the intersection of the extension line of the linear part of a presumed shape line, and an inclination part in case the center insertion is not performed in the measuring apparatus of terrace length of the blast furnace which concerns on the same embodiment. It is the figure which plotted the measured value by the measurement means in the XY coordinate in the terrace length measuring method of the conventional blast furnace. It is a figure which shows the smoothing processing method in the measuring method of the terrace length of the conventional blast furnace. It is a figure which shows the method of calculating | requiring the inclination | tilt angle by a center difference in the measuring method of the terrace length of the conventional blast furnace. It is a figure which shows the method of calculating | requiring the value of terrace length from the inclination angle calculated | required by the center difference in the measuring method of the terrace length of the conventional blast furnace.

Explanation of symbols

cu connecting curve part F coefficient undetermined continuous function in inclined part is intersection point PL estimated shape line st straight line part X furnace radius at a predetermined position

Claims (12)

It is a measurement method for measuring the terrace length in the layer upper surface shape of the charge laminated in the blast furnace by repeating charging of the charge in the blast furnace,
A measurement step in which the top surface shape of the layer at a furnace radius at a predetermined position is measured;
An estimated shape line that simulates the shape of the upper surface of the layer as a single smooth line having a curve at the furnace radius at the predetermined position includes a horizontal or substantially horizontal linear portion near the furnace wall, and a portion of the linear portion. A shape line derivation having an inclined portion that is located on the furnace center side and has a constant downward gradient toward the furnace center, and the estimated shape line is derived based on the measurement value obtained by the measurement in the measurement step. Steps,
Based on the derived estimated shape line, an intersection of the extension line to the furnace center side of the straight part and the extension line to the furnace wall side of the inclined part is derived, and based on the distance from the intersection point to the furnace wall A terrace length deriving step in which the terrace length is derived,
In the shape line deriving step, the estimated shape line is defined, and the straight line portion, the inclined portion, and a curve that smoothly connects the furnace center side end portion of the straight portion and the furnace wall side end portion of the inclined portion. A continuous function with an unknown coefficient having a part thereof is set in advance, and the estimated shape line is derived by calculating a coefficient of the continuous function based on a measurement value obtained in the measurement step. How to measure the terrace length of a blast furnace. In the measuring method of the terrace length of the blast furnace of Claim 1,
The continuous function includes a straight section corresponding to the straight section arranged in order from the furnace wall toward the furnace center, a curved section corresponding to the curved section, and a tilt section corresponding to the inclined section. For a plurality of sections sectioned along a radius, each section function is defined by a series of defined section functions.
These plural types of interval functions are set such that the coefficient and the range in the furnace radial direction of the predetermined position are undetermined and continue at the boundary between adjacent interval functions,
In the shape line derivation step, the estimated shape line is derived by calculating coefficients in all the section functions and ranges in the furnace radial direction of the predetermined positions based on the measurement values obtained in the measurement step. A method for measuring the terrace length of a blast furnace. In the measuring method of the terrace length of the blast furnace of Claim 2,
The method for measuring a terrace length of a blast furnace, wherein the interval function is a function represented on an xy plane having a furnace center axis as a y-axis and a furnace radius at the predetermined position as an x-axis. In the measuring method of the terrace length of the blast furnace of Claim 3,
The continuous function is defined by four section functions. In these four section functions, the line defined by the corresponding section function is a straight line corresponding to the straight line portion in order from the furnace wall toward the furnace center side. A first linear function, a first curve function in which the line becomes a curve corresponding to the curved portion, a second linear function in which the line becomes a straight line corresponding to the inclined portion, and a second in which the line becomes a curve A method of measuring the terrace length of a blast furnace, characterized by the following curve function. In the measuring method of the terrace length of the blast furnace of Claim 3,
The continuous function is defined by three interval functions, and in these three interval functions, a line defined by the corresponding interval function is a straight line corresponding to the straight line portion in order from the furnace wall to the furnace center side. The terrace length of the blast furnace, wherein the first linear function is a curve function in which the line is a curve corresponding to the curved portion, and a second linear function in which the line is a straight line corresponding to the inclined portion. Measuring method. In the measuring method of the terrace length of the blast furnace of Claim 3,
In the shape line derivation step, four interval functions are defined as continuous functions with undecided coefficients that define the estimated shape line, and the four interval functions are sequentially applied from the furnace wall toward the furnace center. A first linear function in which a line defined by the above is a straight line corresponding to the straight line portion, a first curve function in which the line is a curved line corresponding to the curved portion, and a straight line corresponding to the inclined portion. A second linear function, a first continuous function that is a second curve function in which the line is a curve,
A third linear function that is defined by three section functions, and in which the three section functions are sequentially from the furnace wall toward the furnace center, and a line defined by the corresponding section function is a straight line corresponding to the straight line portion; Two continuous functions, a third curve function in which the line becomes a curve corresponding to the curved portion and a second continuous function that is a fourth linear function in which the line becomes a straight line corresponding to the inclined portion, Set,
If the charge is charged into the furnace center when a new charge is charged into the blast furnace, the first value is based on the measurement value obtained in the measurement step. When the estimated shape line is derived and the charge is not charged into the furnace center, the first function is calculated based on the measurement value obtained in the measurement step. A method for measuring a terrace length of a blast furnace, wherein a coefficient of a continuous function of 2 is calculated and the estimated shape line is derived. In the measuring method of the terrace length of the blast furnace of any one of Claims 4 thru | or 6,
The first curve function, the second curve function, the third curve function or the curve function is a function having a constant angle change rate with respect to the x-axis represented by the following equation (1), or A method for measuring the terrace length of a blast furnace, which is a quadratic function represented by equation (2).
y = (− 1 / a) · log | cos (ax + b) | + c (1)
y = αx ² + βx + γ (2)
Here, a, b, c, α, β, and γ are coefficients. In the measuring method of the terrace length of the blast furnace of any one of Claim 4 thru | or 7,
In the shape line derivation step, the steepest descent method is used from the measurement values obtained in the measurement step, and the coefficients in all the interval functions and the ranges in the x-axis direction are obtained at the same time. Measurement method. It is a measuring device that measures the terrace length in the layer upper surface shape of the charge stacked in the blast furnace by repeatedly charging the charge in the blast furnace,
Terrace length deriving means for deriving the terrace length based on the measurement value obtained by measuring the shape of the top surface of the charge in the furnace radius at a predetermined position;
Output means for outputting the terrace length value derived by the terrace length deriving means to the outside,
The terrace length deriving means is configured such that a continuous function with an unknown coefficient defining an estimated shape line that simulates the shape of the top surface of the layer as a smooth line having a curve at the furnace radius at the predetermined position is a horizontal function near the furnace wall or A substantially horizontal straight portion, an inclined portion located on the furnace center side of the straight portion and having a constant downward slope toward the furnace center, a furnace center side end portion of the straight portion, and a furnace wall of the inclined portion A function storage unit that has a curve portion that smoothly connects the side end portion in part, and stores a continuous function with an unknown coefficient in advance;
A coefficient calculation unit for calculating a coefficient of the continuous function stored in the function storage unit based on the measurement value, and storing a continuous function obtained by substituting the calculated coefficient;
An estimated shape line is derived based on the continuous function stored in the coefficient calculation unit, and an extension line to the furnace center side of the straight line portion and an extension line to the furnace wall side of the inclined portion based on the estimated shape line An intersection derivation unit for deriving an intersection with and storing position information of the intersection;
A terrace length deriving unit for deriving a terrace length based on a distance from the intersection to the furnace wall where position information is stored in the intersection deriving unit, and transmitting the derived terrace length value to the output means; An apparatus for measuring the terrace length of a blast furnace. The apparatus for measuring the terrace length of a blast furnace according to claim 9,
The continuous function stored in the function storage unit is a function represented on an xy plane in which the furnace center axis is the y-axis and the furnace radius at the predetermined position is the x-axis, and is directed from the furnace wall toward the furnace center side. A plurality of sections partitioned along the x-axis including a straight section corresponding to the straight section, a curved section corresponding to the curved section, and an inclined section corresponding to the inclined section. A plurality of types of interval functions are defined in a series, and each of these types of interval functions is set such that the coefficient and the range in the x-axis direction are undetermined and are continuous at the boundary between adjacent interval functions,
The coefficient calculation unit derives the estimated shape line by calculating a coefficient and a range in the x-axis direction in all interval functions defining a continuous function stored in the function storage unit based on the measurement value. An apparatus for measuring the terrace length of a blast furnace. The apparatus for measuring a terrace length of a blast furnace according to claim 10,
The terrace length deriving means is an input unit for inputting information as to whether or not charging of the charging material into the furnace center has been performed when charging a new charging material into the blast furnace, or Information on whether or not charging of the charge into the furnace center has been performed is received from at least one receiving unit, and a charging information storage unit that stores the input or transmitted information. And
The function storage unit is defined by four section functions, and these four section functions are in order from the furnace wall toward the furnace center, and a line defined by the corresponding section function is a straight line corresponding to the straight section. A first linear function in which the line becomes a curve corresponding to the curved portion, a second linear function in which the line becomes a straight line corresponding to the inclined portion, and the line becomes a curved line A first continuous function which is a second curve function;
The third linear function is defined by three interval functions, and these three interval functions are in order from the furnace wall toward the furnace center, and the line defined by the corresponding interval function is a straight line corresponding to the straight line portion. , Two continuous functions, a third curve function in which the line becomes a curve corresponding to the curved portion, and a second continuous function which is a fourth linear function in which the line becomes a straight line corresponding to the inclined portion. Pre-stored,
The coefficient calculating unit stores the function based on the measured value when the charging material is charged into the core based on the information stored in the charging information storage unit. Calculating a coefficient of the first continuous function stored in the unit, storing a first continuous function into which the calculated coefficient is substituted,
When charging of the charged material into the core portion is not performed, a coefficient of the second continuous function stored in the function storage unit is calculated based on the measured value, and the calculated Store the second continuous function with the assigned coefficient,
The intersection length deriving unit derives an estimated shape line based on the first continuous function or the second continuous function stored in the coefficient calculation unit, and the terrace length measuring device for a blast furnace. The apparatus for measuring the terrace length of a blast furnace according to any one of claims 9 to 11,
A terrace of a blast furnace, further comprising measuring means for measuring the shape of the upper surface of the layer of the charge at the furnace radius at the predetermined position and transmitting a measurement value obtained by the measurement to the terrace length deriving means. Length measuring device.

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