JP2010138486A - Method of and device for measuring terrace length in blast furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of and a device for stably measuring a furnace terrace length in a blast furnace even in such a case that measured values obtained by measuring the layer upper surface shape of charged materials include any noise. <P>SOLUTION: The method includes the steps of: measuring the layer upper surface shape; deriving an estimated shape line 50 based on the measured value; and deriving the terrace length based on a threshold value and the estimated shape line 50. The estimated shape line 50 includes a region 53 in which the height position lowers and its gradient increases as it comes to the center of the furnace from the position of the inner surface of a furnace wall or the position having a prescribed distance from the inner surface. In the terrace length-deriving step, the position at which the value of a tilt angle to the horizontal direction tangent to the estimated shape line 50 in the region 53 in which the height position lowers becomes a threshold value, is calculated, and the terrace length is derived on the basis of such a position. <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 the charge such as ore and coke into 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. 23, 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 is smoothed using a quadratic curve (y = px ² + qx + r) as shown in FIG. Next, as shown in FIG. 25, among the plurality of measurement points, using the depth data after the smoothing process at measurement points separated by n points (two points in FIG. 25) 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. 26, the inclination angle at each measurement point is scanned in order from the furnace center toward the furnace wall, and the inclination angle is a threshold value (see FIG. 26, a measurement point g that is less than 15 ° 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 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 measuring step of measuring the top surface shape of the layer at a furnace radius at a predetermined position; and a measuring step of an estimated shape line that simulates the top surface shape of the layer as a single smooth line at the furnace radius of the predetermined position. And a terrace length deriving step for deriving a terrace length based on the estimated shape line derived in the shape line deriving step. In the deriving step, a threshold value for determining the position of the end portion on the furnace center side in the furnace radial direction of the terrace portion having the upper surface shape of the layer is set in advance, and the estimation derived in the shape line deriving step is performed. When the shape line includes a portion where the height position decreases toward the furnace center from the position on the inner surface of the furnace wall or at a predetermined distance from the inner surface, and the gradient increases as it moves toward the furnace center, A position where the value of the inclination angle with respect to the horizontal direction of the tangent line of the estimated shape line in the region where the height position of the estimated shape line decreases and the gradient increases is calculated as the threshold value, and the furnace wall is calculated from this position. The terrace length is derived based on the distance up to. Here, in the present invention, the line means a finite length line having both ends. The single smooth line refers to a line that can be differentiated at an arbitrary position in the furnace radial direction. The terrace portion refers to a horizontal or substantially horizontal region formed in the vicinity of the furnace wall in the layer upper surface shape of the charge.

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

  Specifically, an estimated shape line as a single smooth line is derived based on the plurality of measurement values regardless of the magnitude or amount of noise included in each measurement value, and at the furnace radius at the predetermined position. By imitating the surface profile by this estimated shape line, even if there is a partial protrusion etc. (noise) that happened to the measured surface profile, the influence is suppressed and a highly accurate surface profile is obtained. .

  Moreover, the estimated shape line includes a portion where the height position decreases as it goes from the position of the inner surface of the furnace wall or a predetermined distance from the inner surface toward the furnace center, and the gradient increases as it goes toward the furnace center. In this case, the position where the value of the inclination angle with respect to the horizontal direction of the tangent to this part becomes the threshold value is calculated as the position of the end portion on the furnace center side of the terrace portion, and the horizontal distance between this position and the furnace wall is only obtained. The terrace length can be derived easily and accurately.

  In the method for measuring the terrace length of a blast furnace according to the present invention, the estimated shape line extends from a horizontal or substantially horizontal straight line portion located in the vicinity of the furnace wall and an end portion on the furnace center side of the straight line. The step of deriving the terrace length is to calculate a position at which the value of the inclination angle of the tangent of the curved portion in the curved portion becomes the threshold value. It is preferable to derive the terrace length based on the distance from the position to the furnace wall. As described above, the estimated shape line has a straight portion on the furnace wall side and a curved portion extending from the furnace center side end portion of the straight portion, thereby suppressing unevenness in the portion of the estimated shape line derived on the furnace wall side. Therefore, the influence of noise is further suppressed in the portion of the estimated shape line that is derived.

  The estimated shape line has an inclined portion that extends from the furnace center side end portion of the curved portion that is a portion where the height position decreases and the gradient increases, and has a constant downward gradient toward the furnace center, The shape is more approximate to the terrace, and the vicinity of the terrace is a simple line with a straight line, a curved part, and an inclined part, or a curved part and an inclined part. The

  Specifically, when the charge is charged into the blast furnace during normal blast furnace operation, it is necessary to adjust the surface profile in order to maintain stable operation of the blast furnace. The charge is charged while changing the fall position along the radial direction. As a result of analyzing the data of many surface profiles such as past performance data in such an operating state, in the blast furnace in operation, in many surface profiles, the surface profile at the furnace radius at a predetermined position has a curved line. If this line is simulated by a smooth line (estimated shape line), the horizontal or nearly horizontal straight line part near the furnace wall and the straight line part on the furnace center side of this line are located toward the furnace center. There is a tendency that an inclined portion having a certain downward slope and a curved portion bulging upward in the furnace center portion appear. Therefore, for example, an estimated shape line having a straight portion, a curved portion, and an inclined portion in order from the furnace wall toward the furnace center side simulates the surface profile, thereby obtaining an estimated shape line approximated to the surface profile. The influence of noise is further suppressed by imitating the surface profile by an estimated shape line having a simple shape in which a linear portion, a curved portion, and an inclined portion are arranged on the furnace wall side.

  The estimated shape line is defined by a continuous function whose coefficient is undetermined expressed 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. It is expressed in the form of (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 surface 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 along the x-axis including a straight line section corresponding to the straight line section arranged in order from the furnace wall toward the furnace center side, a curved section corresponding to the curved section, and a tilt section corresponding to the sloping section. A plurality of types of interval functions defined for each of a plurality of intervals divided by a plurality of intervals are defined, and the plurality of types of interval functions have coefficients and x-axis ranges that are undetermined and between adjacent interval functions. In the shape line derivation step, coefficients in all the interval functions and ranges in the furnace radial direction of the predetermined positions are calculated based on the measurement values obtained in the measurement step. Preferably, the estimated shape line is derived.

  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 an estimated shape line that more closely approximates the actual surface profile. As a result, the terrace length can be derived more accurately.

  The continuous function is defined by a first linear function, a first curve function, a second linear function, and a second curve function arranged in order from the furnace wall toward the furnace center side, and the first linear function The function is a function in which a line defined by the function becomes a straight line corresponding to the straight line portion, and the first curve function is a function in which a line defined by the function becomes a curve corresponding to the curved portion. The second linear function is a function in which a line defined by the function is a straight line corresponding to the inclined portion, and the second curve function is a function in which the line defined by the function is the center of the furnace. It is preferable that the function be a curve that is located at the portion and bulges upward.

  In this way, the estimated shape line is defined by a line in which the lines defined by the first linear function, the first curve function, the second linear function, and the second curve function are connected in series. Regardless of whether or not charging of the charge into the furnace center (center charging) is performed when charging a new charge into the blast furnace, the surface profile of the charge An estimated shape line having an appropriate shape can be obtained.

  By defining the estimated shape line by connecting a few interval functions in this way, it becomes easy to calculate the coefficient in each interval function based on the measured value of the surface profile and the range in the furnace radial direction of the predetermined position. Derivation of the line becomes easy. Moreover, since the derived estimated shape line has a shape that matches the measured surface profile, the terrace length can be derived with high accuracy.

  In addition, when the central charging is not performed when a new charge is charged into the blast furnace, the continuous function is a first primary arranged in order from the furnace wall toward the furnace center. A function, a curve function, and a second linear function, wherein the first linear function is a function in which a line defined by the function is a straight line corresponding to the straight line portion, and the curve function is the function And the second linear function may be a function in which a line defined by the function becomes a straight line corresponding to the inclined portion. .

  In this way, when center charging is not performed, there are even fewer interval functions than when center charging is performed, that is, lines defined by the first linear function, the curve function, and the second linear function, respectively. By simply connecting them in series, it is possible to obtain an estimated shape line having a shape that conforms to the surface profile of the charge, and it is easier to derive the estimated shape line.

  Further, 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, as a continuous function with an indeterminate coefficient that defines the estimated shape line, a line defined by a corresponding function sequentially arranged from the furnace wall toward the furnace center side is a straight line corresponding to the straight line portion. A first linear function in which the line is a curve corresponding to the curved portion, a second linear function in which the line is a straight line corresponding to the inclined portion, and the line is the furnace center A line defined by a first continuous function defined by a second curve function that is a curved line that is located in the section and bulges upward, and a corresponding function that is arranged in order from the furnace wall toward the furnace center. A third linear function that becomes a straight line corresponding to the straight line part, a third curve function that makes the line a curve corresponding to the curved part, and a fourth linear function that makes the line a straight line corresponding to the inclined part With a second continuous function defined by Two continuous functions were preset and obtained in the measurement step when the charge was charged into the furnace center when the new charge was charged into the blast furnace. When the coefficient of the first continuous function is calculated based on the measured value and the estimated shape line is derived and the charging material is not charged into the furnace center, it is obtained in the measuring step. The estimated shape line may be derived by calculating a coefficient of the second continuous function based on the measured value.

  With this configuration, calculation when the center charging is not performed is facilitated, and an estimated shape line is derived using the first continuous function regardless of the presence or absence of the center charging. Compared to the case, it is possible to derive an estimated shape line having a shape conforming to the surface 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 relative to a position in the x-axis direction at an angle formed by a tangent to the curve defined by the curve function and the x-axis. It is preferable that the angle change rate is a constant function. Specifically, the first curve function, the second curve function, the third curve function, or the curve function is a function represented by the following expression (1) or (2): Is preferred.

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.

  Thus, since the first curve function, the second curve function, the third curve function, or the curve function is a simple function and has a small number of coefficients, the coefficient of each function based on the measurement value and the x-axis It is also easier to calculate the range of directions, that is, the range of the furnace radius at the predetermined position. Therefore, it is easy to calculate the coefficient of each function and the range in the x-axis direction based on the measured value of the surface profile, and it is easy to derive the estimated shape line.

  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.

  In the method for measuring the terrace length of the blast furnace as described above, corresponding portions of the upper surface of the layer are respectively measured from a plurality of measurement positions along the furnace radius at the predetermined position and arranged over the entire furnace radius in the measurement step. Then, by deriving the estimated shape line based on all the measured values measured at each measurement position in the entire furnace radius in the shape line deriving step, noise is included in the measured value obtained in the measuring step. However, the terrace length can be measured stably. However, in the above configuration, when the terrace length is derived, the estimated shape line is derived based on all the measurement values measured at each measurement position in the entire furnace radius. A terrace portion having a small terrace length formed near the wall may not appear on the estimated shape line.

  Therefore, in the terrace length measurement method, when it is determined in the terrace length derivation step that the estimated shape line does not include a portion where the height position decreases and the gradient increases, the measurement is performed. Partial measurement value terrace detection that detects the terrace part based only on the measurement value obtained in a predetermined furnace wall side region from the furnace wall at the furnace radius of the predetermined position among the measurement values obtained in the step Further steps were provided.

  According to this configuration, the terrace length deriving step is performed by determining the presence or absence of the terrace portion based only on the measurement value obtained in the predetermined furnace wall side region from the furnace wall at the furnace radius at the predetermined position. It is possible to detect a terrace portion having a small terrace length formed in the vicinity of the furnace wall so that it is determined that there is no terrace portion. That is, the shape near the furnace wall in the surface profile can be detected with higher accuracy by using only the measurement values in the narrow area (furnace wall side region) near the furnace wall as compared with the entire furnace radius.

  In the partial measurement value terrace detection step, the height position of the portion of the upper surface of the layer corresponding to the first measurement position closest to the furnace wall obtained in the measurement step, and the first position in the furnace wall side region. Based on the difference in height from the height position of the portion on the upper surface of the layer corresponding to the second measurement position that is a predetermined distance away from the measurement position to the furnace center side, the terrace portion in the furnace wall side region is detected. It may be broken.

  According to such a configuration, it is possible to accurately and easily determine whether or not there is a terrace portion having a small terrace length in the vicinity of the furnace wall from only two height differences spaced in the furnace radial direction in the furnace wall side region on the upper surface of the layer. Can be judged.

  The partial measurement value terrace detection step is based on the measurement value obtained in the furnace wall side region in the measurement step, and the partial estimation that simulates the layer upper surface shape in the furnace wall side region as a single smooth line A partial shape line deriving step for deriving a shape line, and a partial shape line threshold for determining the position of the end portion on the furnace center side in the furnace radial direction of the terrace portion are set in advance, and in the partial shape line deriving step, In the case where the derived partial estimated shape line includes a portion where the height position decreases from the position of the inner surface of the furnace wall toward the furnace center and the gradient increases toward the furnace center, the partial estimated shape line The position where the value of the inclination angle with respect to the horizontal direction of the tangent of the partial estimated shape line in the portion where the height position decreases and the gradient increases is calculated as the threshold value for the partial shape line, and this position is the furnace wall If it is within the region, the terrace length is derived based on the distance from the position to the furnace wall, while the partial shape line threshold is not within the furnace wall side region or the partial shape line deriving step. A partial measurement value terrace length derivation step for determining that the terrace of the upper surface of the layer does not have a terrace when the height estimated position is not included in the partial estimated shape line derived in step (b). May be provided.

  According to such a configuration, by deriving the partial estimated shape line based on the measurement value obtained in the furnace wall side region, the vicinity of the furnace wall such that it is determined that there is no terrace portion in the terrace length deriving step Even if the terrace portion has a small terrace length, the terrace length can be derived easily and accurately.

  Specifically, a partial estimated shape line as one smooth line is derived based on a plurality of measurement values obtained in the furnace wall side region, and the height position of the partial estimated shape line is reduced. And the position where the value of the inclination angle with respect to the horizontal direction of the tangent to the part becomes the threshold value for the partial shape line is calculated as the position of the furnace center side end part of the terrace part. If it is in the furnace wall side region, the terrace length of the terrace portion formed only in the vicinity of the furnace wall can be accurately derived based on the distance from the position to the furnace wall.

  In a configuration in which a partial estimated shape line is derived in the partial measurement value terrace detection step, the partial estimated shape line is represented on an xy plane with the furnace center axis as the y axis and the furnace radius at the predetermined position as the x axis. In the partial shape line derivation step, the partial estimation is performed by calculating the coefficient based on the measured value obtained in the furnace wall side region in the measurement step. The shape line is preferably derived.

  According to this configuration, the intra-region continuous function is expressed in the form y = f (x), and the intra-region continuous function can be easily handled. Therefore, it becomes easy to calculate the coefficient in the continuous function in the region based on the measured value of the surface profile in the furnace wall side region, and as a result, the partial estimated shape line is easily derived.

  In the partial shape line derivation step, a predetermined number from the measurement position closest to the furnace wall side to the furnace center side among the plurality of measurement positions in the furnace wall side region measured in the measurement step. The partial estimated shape line is derived using the measurement values at each measurement position up to the measurement position, and the predetermined number must be at least the number of undetermined coefficients included in the continuous function in the region It becomes. That is, if there are a number of values (measured values) equal to or greater than the number (number) of undetermined coefficients included in the function (continuous function in the region), the value of the undetermined coefficient included in the function can be calculated.

  The intra-region continuous function is preferably a function having a constant angle change rate with respect to a position in the x-axis direction at an angle formed by a tangent of a line defined by the intra-region continuous function and the x-axis. Specifically, the in-region continuous function is preferably a function represented by the following expression (3) or (4).

y = (− 1 / d) · log | cos (dx + e) | + f (3)
y = δx ² + εx + ζ (4)
Here, d, e, f, δ, ε, and ζ are coefficients.

  Since the intra-region continuous function is a simple function and has a small number of coefficients, it is easy to calculate the coefficient of the intra-region continuous function based on the measured value obtained in the furnace wall side region. Therefore, it is easy to derive the partial estimated shape line based on the measured value of the surface profile in the furnace wall side region.

  When the partial estimated shape line is derived in the partial measurement value terrace detection step, the threshold value of the terrace length derivation step and the partial shape line threshold value of the partial measurement value terrace length derivation step are the same value. Even so, the presence / absence of a terrace portion having a small terrace length formed in the vicinity of the furnace wall and the position of the end portion on the furnace center side of the terrace portion can be accurately derived.

  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 an output means for outputting the terrace length value derived by the terrace length deriving means to the outside, wherein the terrace length deriving means has a single top surface shape of the layer at the furnace radius at the predetermined position. A function storage unit that stores in advance a coefficient undetermined continuous function that prescribes an estimated shape line that simulates a smooth line, and a coefficient of the continuous function stored in the function storage unit based on the measurement value Calculate and calculate this A coefficient calculation unit that stores a continuous function into which the calculated coefficient is substituted, a threshold value storage unit that preliminarily stores a threshold value for defining the furnace center side end in the furnace radial direction of the terrace portion of the layer upper surface shape, Based on the threshold value stored in the threshold value storage unit and the continuous function stored in the coefficient calculation unit, the position of the end of the top surface of the terrace portion on the furnace radius side in the furnace radial direction is calculated, and this position A terrace length is derived based on the end position deriving unit for storing information, and the distance from the end position stored in the end position deriving unit to the furnace wall, and the value of the derived terrace length A terrace length deriving unit that transmits the position to the output means, and the end position deriving unit includes the position of the inner surface of the furnace wall or its position on the estimated shape line defined by the continuous function stored in the coefficient calculating unit. From a position at a predetermined distance from the inner surface to the furnace center Of the estimated shape line where the height position decreases and the gradient increases, when the height position decreases and the gradient increases toward the furnace center. The position at which the value of the inclination angle of the tangent line with respect to the horizontal direction becomes the threshold value stored in the threshold value storage unit is calculated as the end position on the furnace center side of the terrace unit.

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

  In addition, the estimated shape line, which is a single smooth line, is used, and the height position decreases as the estimated shape line moves from the position of the inner surface of the furnace wall or a predetermined distance from the inner surface toward the furnace center. When the gradient includes a portion that increases toward the furnace center, the value of the inclination angle of the tangent line of the estimated shape line in the portion where the height position decreases and the gradient increases is compared with a threshold value. Since the terrace length can be derived by such a simple calculation, the configuration of the end position deriving unit and the terrace length deriving unit can be simplified.

  In the apparatus for measuring the terrace length of a blast furnace according to the present invention, the estimated shape line extends from a horizontal or substantially horizontal straight line portion located in the vicinity of the furnace wall side and a furnace center side end portion of the straight line. It is preferable that the end position deriving unit calculates a position where the value of the inclination angle of the tangent of the curved portion in the curved portion becomes the threshold value. As described above, the estimated shape line has a straight portion on the furnace wall side and a curved portion extending from the furnace center side end portion of the straight portion, thereby suppressing unevenness in the portion of the estimated shape line derived on the furnace wall side. Therefore, the influence of noise is further suppressed at the portion of the derived estimated shape line.

  The estimated shape line further includes an inclined portion that extends from the end portion on the furnace center side of the curved portion, which is a portion where the height position decreases and the gradient increases, and has a constant downward gradient toward the furnace center. In addition to the shape approximated by the terrace, the area near the terrace is a simple line with a straight line, a curved part, and an inclined part, or a curved part and an inclined part. Is done. In addition, the estimated shape line is defined by a continuous function with an indeterminate coefficient expressed 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. = F (x), each section function can be easily handled, and the configuration of the terrace length deriving means can be simplified.

  In addition, the continuous function includes the x-axis including 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 an inclined section corresponding to the inclined section. A plurality of types of interval functions defined for a plurality of intervals divided along the line are defined in series, and these types of interval functions are adjacent interval functions whose coefficients and x-axis ranges are undetermined, respectively. It is set to be continuous at the boundary between each other, and in the coefficient calculation unit, the coefficient in all the section functions and the range in the furnace radial direction of the predetermined position are calculated based on the measurement value, thereby the estimated shape A line is preferably derived.

  According to such a configuration, the continuous function is divided into sections other than the straight section, the curved section, and the inclined section, and a section function that defines a line according to the surface profile is set for each section. An estimated shape line approximating the actual surface profile is obtained, and a more accurate terrace length can be derived.

  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 unit, wherein the function storage unit includes a first linear function in which a line defined by a corresponding function arranged in order from the furnace wall toward the furnace center becomes a straight line corresponding to the straight line part, A first curve function in which the line is a curve corresponding to the curved portion, a second linear function in which the line is a straight line corresponding to the inclined portion, and the line is located at the furnace center and swells upward. A first continuous function defined by a second curve function that is a curve to be drawn, and a furnace wall to a furnace A third linear function in which a line defined by a corresponding function sequentially arranged toward the center side 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 Two continuous functions, a second continuous function defined by a fourth linear function in which the line becomes a straight line corresponding to the inclined portion, are stored in advance, and the coefficient calculation unit is stored in the charging information storage unit. Based on the stored information, when the charged material is charged into the core, the first continuous function stored in the function storage based on the measured value A coefficient is calculated, a first continuous function into which the calculated coefficient is substituted is stored, and when the charge is not charged into the core, the function storage is performed based on the measured value. The coefficient of the second continuous function stored in the section is calculated, and this calculation A second continuous function into which the calculated coefficient is substituted, and the end position derivation unit is configured based on the first continuous function or the second continuous function stored in the coefficient calculation unit and the threshold value. The structure which calculates the edge part position by the side of the furnace center of a terrace part may be sufficient.

  According to this configuration, the presence / 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, so that the estimated shape line corresponding to the surface profile can be obtained in a shorter time. The continuous function used in the coefficient calculation unit is switched so as to be derived by

  In the blast furnace terrace length measuring apparatus as described above, the measurement is performed by measuring corresponding portions of the upper surface of the layer from a plurality of measurement positions along the furnace radius at the predetermined position and over the entire furnace radius. By calculating the coefficient of the continuous function and deriving the estimated shape line based on all the measured values measured at each measurement position in the entire furnace radius, Even if the obtained measurement value includes noise, the terrace length can be measured stably. However, in the above configuration, when the terrace length is derived, the estimated shape line is derived based on all the measurement values measured at each measurement position in the entire furnace radius. A terrace portion having a small terrace length formed near the wall may not appear on the estimated shape line.

  Therefore, in the terrace length measuring apparatus, the end position deriving unit includes a portion where the height position decreases and the gradient increases in the estimated shape line defined by the continuous function for which the coefficient is calculated. When it is determined that the terrace portion is not detected, the terrace portion is detected based only on the measurement value obtained in a predetermined furnace wall side region from the furnace wall at the furnace radius of the predetermined position among the measurement values. The partial measurement value terrace detection part to perform was further provided.

  According to this configuration, the terrace length deriving unit is determined by determining the presence or absence of the terrace based only on the measurement value obtained in the predetermined furnace wall side region from the furnace wall at the furnace radius at the predetermined position. In this case, it is possible to detect a terrace portion having a small terrace length formed in the vicinity of the furnace wall where it is determined that there is no terrace portion. That is, the shape near the furnace wall in the surface profile can be detected with higher accuracy by using only the measurement values in the narrow area (furnace wall side region) near the furnace wall as compared with the entire furnace radius.

  The partial measurement value terrace detection unit is a height position of a portion of the layer upper surface corresponding to the first measurement position on the furnace wall side among the measurement values obtained by measuring the layer upper surface shape of the charge. And in the furnace wall side region based on the height difference with the height position of the portion of the upper surface of the layer corresponding to the second measurement position that is a predetermined distance away from the first measurement position to the furnace center side, You may detect the terrace part in the said furnace wall side area | region.

  According to such a configuration, it is possible to accurately detect a terrace portion having a small terrace length in the vicinity of the furnace wall from only two height differences spaced in the furnace radial direction in the furnace wall side region on the upper surface of the layer. This makes it possible to simplify the configuration of the partial measurement value terrace detection unit.

  In addition, the partial measurement value terrace detection unit stores in advance an in-region continuous function with an unknown coefficient that prescribes a partial estimated shape line that simulates the shape of the upper surface of the layer in the furnace wall side region as a single smooth line. An area function storage unit to be stored, and a coefficient of the in-area continuous function stored in the area function storage unit based on a measurement value obtained in the furnace wall side area, and the calculated coefficient And a partial shape line threshold value for prescribing the furnace center side end portion in the furnace radial direction of the terrace portion of the layer upper surface shape is stored in advance. The partial shape line threshold storage unit and the partial estimated shape line defined by the in-region continuous function stored in the in-region function coefficient calculation unit, the height position decreases from the position of the furnace wall inner surface toward the furnace center. And follow the gradient toward the furnace center In the case where an increasing part is included, the value of the inclination angle with respect to the horizontal direction of the tangent of the partial estimated shape line in the part where the height position of the partial estimated shape line decreases and the gradient increases is the partial shape. A position that is a partial shape line threshold value stored in the line threshold value storage unit is calculated, and if this position is within the furnace wall side region, the position is set as the end portion position on the furnace center side of the terrace portion. On the other hand, when the position serving as the partial shape line threshold is not within the furnace wall side region or when the partial estimated shape line does not include a portion where the height position decreases and the gradient increases, An area inner end position deriving unit that determines that the part position is the same position as the furnace wall position may be provided.

  According to such a configuration, the in-region function coefficient calculation unit derives the partial estimated shape line based on the measurement value obtained in the furnace wall side region, so that the terrace length deriving unit determines that there is no terrace portion. Even in such a terrace portion having a small terrace length formed only in the vicinity of the furnace wall, the terrace length can be derived easily and accurately.

  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.

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. In the apparatus for measuring the terrace length of a blast furnace according to the same embodiment, the position at which the inclination angle of the tangent line of the estimated shape line becomes a threshold value is shown as the end position on the furnace center side of the terrace portion. (A) thru | or (c) is a figure which shows the edge part position by the side of the furnace center of the terrace part computed using the estimated shape line and the threshold value from various surface profiles. 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. It is a figure which shows the estimated shape line derived | led-out by fitting a 2nd continuous function to the measured value when center charging is not performed in the terrace length measuring apparatus of the blast furnace according to the same embodiment. In the blast furnace terrace length measurement apparatus according to the embodiment, the position at which the inclination angle of the tangent line of the estimated shape line when the center charging is not performed becomes a threshold value is shown as the end position of the terrace portion on the furnace center side. It is a figure. It is a block diagram of the measuring apparatus of terrace length of a blast furnace concerning a 3rd embodiment. It is a figure which shows the estimated shape line derived by plotting the measured value by the measurement means of the terrace length measuring apparatus of the blast furnace concerning the same embodiment on XY coordinates, and deriving based on all these measured values. The estimated shape line derived based on all measured values collects a plurality of surface profile data determined to have no terrace, and each of these data is measured on the X axis on the height difference between the measurement points P1 and P2 and on the Y axis. It is the figure plotted on the XY coordinate made into the height difference of the points P2 and P3. 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 a block diagram of the measuring apparatus of the terrace length of the blast furnace concerning other embodiments. 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. (A) is the figure which plotted the measured value by the measurement means of the terrace length measuring apparatus of the blast furnace based on 3rd Embodiment on XY coordinate, (b) is all the measured values of Fig.21 (a). It is a figure which shows the estimated shape line derived | led-out based on. (A) is a figure which shows the edge part position by the side of the furnace center of the terrace part calculated | required from the partial estimated shape line derived | led-out using only the measured value of total measurement P1-P4 of Fig.21 (a), (b FIG. 22B is a diagram showing the end position on the furnace center side of the terrace portion obtained from the partial estimated shape line derived using only the measurement values of the total measurements P1 to P3 in FIG. 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.

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

  An apparatus for measuring the terrace length of a blast furnace (hereinafter also simply referred to as “measuring apparatus”) is horizontal or substantially horizontal formed in the vicinity of the furnace wall on the top surface of the charge layered in the blast furnace. It is for measuring the terrace length (refer FIG. 2) which is the horizontal distance along the furnace radial direction of the area | region (terrace part) which has it. 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. In this embodiment, 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 a measuring portion 12b is provided at the tip thereof. Then, the measuring portion 12b at the tip of the measuring rod 12a reciprocates along the furnace radius at a predetermined position of the blast furnace, and the charge layer is based on the reflected wave of the microwave irradiated from the tip (measuring portion) 12b. The height of the upper surface (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 21, a coefficient calculation unit 22, and a threshold storage unit 23. And an end position deriving unit 24 and a terrace length deriving unit 25.

  The function storage unit 21 stores the continuous function F. This continuous function F is a function for defining an estimated shape line 50 (see FIG. 3) for imitating the surface profile at the furnace radius at a predetermined position. This estimated shape line 50 is a single line having a curve. Defined as a smooth line. Further, the estimated shape line 50 includes a portion where the height position decreases toward the furnace center from the position of the inner surface of the furnace wall or a predetermined distance from the inner surface, and the gradient increases as the distance toward the furnace center. . 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 is obtained as a result of analyzing a lot of surface profile data such as past performance data. For the actual data and the like, data on the premise of an operation state in which the charged material is charged while changing the dropping position in the radial direction of the furnace near the furnace wall is used. Specifically, the continuous function F is a function set by paying attention to a common tendency appearing in many surface profiles in the above operating blast furnace. This common tendency is that when the surface profile at the furnace radius at a predetermined position is simulated by a single smooth line having a curve (estimated shape line 50), the horizontal or substantially the vicinity of the furnace wall is included in this line. A horizontal straight line part (straight line part 52), an inclined part (inclined part 54) located on the furnace center side of the straight line part and having a constant downward slope toward the furnace center, and an end part on the furnace center side of the straight line part And a curve portion (connection curve portion 53) that smoothly connects the end portion of the inclined portion on the furnace wall side. The connection curve portion 53 of the continuous function F has a height position that decreases from the position of the inner surface of the furnace wall of the estimated shape line 50 or a position at a predetermined distance from the inner surface toward the furnace center. And the part where the gradient increases as it goes to the furnace center is defined.

  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. The part 52, the inclined part 54, and the connecting curve part 53 that smoothly connects the linear part 52 and the inclined part 54 are included in the part. Here, the straight line portion 52 is a portion that is located in the vicinity of the furnace wall of the line (estimated shape line) 50 defined by the continuous function F and is a horizontal or substantially horizontal straight line. Is a portion located on the furnace center side of the straight line portion 52 of the line defined by the continuous function F and is a straight line having a constant downward slope toward the furnace center. Of the function F, it is located between the straight portion 52 and the inclined portion 54, and the furnace center side end portion (left end portion in FIG. 3) of the straight portion 52 and the furnace wall side end portion of the inclined portion 54 (FIG. 3). In FIG. 4, the right end portion is a curved portion that smoothly connects. The slope and length of the straight portion 52, the slope and length of the inclined portion 54, and the shape of the connection curve portion 53 are not determined because they are different for each surface profile. By calculating the coefficient of the continuous function F based on the plurality of measured values obtained, the gradient and length of the straight portion 52, the gradient and length of the inclined portion 54, the shape of the connection curve portion 53, and the like are obtained. Estimated shape lines 50, each determined and approximating the actual surface profile, can be obtained.

  Specifically, the continuous function F is defined by a series of a plurality of types of section functions respectively defined for a plurality of sections (four sections in the present embodiment) 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 includes a straight section L1 corresponding to the straight section 52, a connection curve section L2 corresponding to the connection curve section 53, and an inclined section 54 from the furnace wall toward the furnace center along the X axis. Are divided into four sections, an inclined section L3 corresponding to the above and a central curve section L4 of the furnace center. With respect to these four sections, the four section functions defined respectively are the first linear functions in which the line defined by the corresponding section function is a straight line corresponding to the straight section 52 in order from the furnace wall toward the furnace center side. A function f11, a first curve function f21 in which the line is a curve corresponding to the connection curve portion 53, a second linear function f12 in which the line is a straight line corresponding to the inclined portion 54, and the line is upward. The second curve function f22 is a bulging curve.

More specifically, the interval functions f11, f12, f21, and f22 are expressed as follows:
y = e ₁ x + f ₁ (hereinafter, also simply referred to as “Expression (10)”)
And the second linear function f12 is
y = e ₂ x + f ₂ (hereinafter also simply referred to as “Expression (12)”)
It is represented by The first curve function f21 is
y = (− 1 / a) · log | cos (ax + b) | + c (hereinafter also simply referred to as “expression (11)”)
And the second curve function f22 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.

  In the following, in the furnace radius (X axis) at the predetermined position, the boundary position between the straight section L1 and the connecting curve section L2 is r1, the boundary position between the connecting curve section L2 and the inclined section L3 is r2, and the inclined section L3. And the central curve section L4 is r3.

  The coefficient calculation unit 22 is a part that calculates the coefficient of the continuous function F stored in the function storage unit 21 based on the measurement value, and stores the continuous function F into which the calculated coefficient is substituted. The calculation of the coefficient of the continuous function F in the present embodiment means the coefficient of each interval function f11, f21, f12, f22 that defines the continuous function F and the X-axis direction of each interval function f11, f21, f12, f22. It means to find the range.

  The threshold storage unit 23 stores a threshold. This threshold value is a value for defining the furnace center side end of the terrace portion of the surface profile in the furnace radial direction. Specifically, the value of the inclination angle with respect to the horizontal direction of the tangent line of the estimated shape line 50 is used, and the threshold value of this embodiment is 7 ° (see FIG. 7). The threshold value storage unit 23 is configured to be able to change the threshold value stored in the threshold value storage unit 23 from the outside by a blast furnace operator or the like.

  The end position deriving unit 24 is based on the threshold value stored in the threshold value storage unit 23 and the continuous function F stored in the coefficient calculation unit 22 in the X-axis direction of the terrace portion of the surface profile (the furnace radial direction at a predetermined position). The position of the end portion on the furnace center side in () is calculated and the position information of the calculated end position is stored. Specifically, the end position derivation unit 24 derives the estimated shape line 50 from the continuous function F stored in the coefficient calculation unit 22, and the position of the furnace wall inner surface of the estimated shape line 50 or the inner surface thereof. A portion where the height position decreases from the position at a predetermined distance from the center toward the furnace center and the gradient increases toward the furnace center, that is, the connection curve portion 53 is specified. Then, when the connection curve portion 53 can be identified, that is, when the connection curve portion 53 is included in the derived estimated shape line 50, the end position deriving portion 24 performs the connection in the identified connection curve portion 53. The position where the value of the inclination angle with respect to the horizontal direction of the tangent line of the curved portion 53 (estimated shape line 50) becomes the threshold value stored in the threshold value storage portion 23 is calculated as the end portion position on the furnace center side of the terrace portion on the X axis. To do.

  The terrace length deriving unit 25 derives the terrace length based on the distance from the end position on the furnace center side to the furnace wall (furnace wall inner surface) of the terrace part in which the position information is stored in the end position deriving unit 24. The derived terrace length value is transmitted (transmitted) to the output means 14 as an output signal.

  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 calculator 22) (step S1). 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 22 that has received the output signal acquires the continuous function F (see FIG. 3) stored in the function storage unit 21, and applies the acquired continuous function F to the measurement value obtained by the output signal. By fitting, the coefficient of the continuous function F is derived (step S2).

  At this time, the coefficients in all interval functions f11, f21, f12, and f22 that define the continuous function F and the range 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 central curve section L4) are simultaneously obtained by the steepest descent method which is one of nonlinear optimization techniques. In this way, by using the steepest descent method, the coefficients in all the interval functions f11, f21, f12, and f22 and the ranges (intervals) in the X-axis direction in which the interval functions f11, f21, f12, and f22 are defined, Can be easily obtained.

  The coefficient calculation unit 22 stores the continuous function F in which the coefficients of the section functions f11, f21, f12, and f22 thus obtained and the range in the X-axis direction are substituted.

  The end position deriving unit 24 derives the estimated shape line 50 based on the continuous function F stored in the coefficient calculating unit 22 (see FIG. 6). 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, so that the gradient and length of the straight part 52 and the shape of the connection curve part 53 are obtained. The slope and length of the inclined portion 54 and the shape of the central curve portion 55 are determined, that is, the coefficients of the interval functions f11, f21, f12, and f22 and the ranges in the X-axis direction are determined, respectively, and the actual surface An estimated shape line 50 approximating the profile can be obtained. Then, the end position deriving unit 24 specifies the connection curve unit 53 from the estimated shape line 50 derived in this way (step S3). Depending on the measurement value obtained by the measuring means 12, in the estimated shape line 50 derived in this step, the range (length) in the X-axis direction of the straight portion 52 or the straight portion 52 and the connection curve portion 53 may be. In other words, the estimated shape line 50 may not include the straight line portion 52 or the straight line portion 52 and the connection curve portion 53 may not be included.

  Next, when the connection curve portion 53 is included in the estimated shape line 50, the end position derivation unit 24 determines the connection curve portion 53 (the estimated shape line 50 in the connection curve portion 53 specified in the estimated shape line 50. The position on the X-axis where the value of the inclination angle of the tangent line with respect to the horizontal direction becomes the threshold value stored in the threshold value storage unit 23 is the end position on the furnace center side of the terrace part (end position on the X-axis) calculate. The end position deriving unit 24 of the present embodiment calculates a position where the angle of the tangent is 7 ° with respect to the horizontal direction (X axis) as the end position on the furnace center side of the terrace (see FIG. 7). . The end position derivation unit 24 stores position information on the X axis of the end position of the terrace portion on the furnace center side (step S4).

  The terrace length deriving unit 25 derives a horizontal distance from the end position where the position information is stored in the end position deriving unit 24 to the furnace wall, and outputs this horizontal distance as a terrace length value as an output signal. It transmits to the means 14 (step S5). As described above, the position where the value of the tangent in the connection curve portion 53 of the estimated shape line 50 coincides with the preset threshold value is set as the end position on the furnace center side of the terrace portion, so that the accurate terrace length is obtained. Can be derived.

  The output means 14 that has received this output signal displays the value (step S6). Based on this display, the operator who operates the blast furnace can quickly and accurately grasp the terrace length. When the end position derivation unit 24 determines that the connection curve portion 53 is not included in the estimated shape line 50, the output means 14 displays that there is no terrace portion.

  According to the measurement apparatus 10 as described above, even if noise is included in a plurality of measurement values obtained by measurement of the surface profile by the measurement means 12, the terrace length can be easily and accurately based on these measurement values. It can be derived.

  Specifically, an estimated shape line 50 as a single smooth line having a curve is derived based on the plurality of measurement values regardless of the magnitude or amount of noise included in each measurement value, and a predetermined position is obtained. The surface profile at the furnace radius is simulated by this estimated shape line 50, 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 surface has high accuracy. A profile is obtained.

  In addition, the estimated shape line 50 is a portion where the height position decreases as it goes from the position of the furnace wall inner surface or a predetermined distance from the inner surface to the furnace center, and the gradient increases as it goes to the furnace center. When the connection curve portion 53 is included, the position where the value of the inclination angle with respect to the horizontal direction of the tangent to the connection curve portion 53 becomes a threshold value is calculated as the end position of the furnace center side end portion of the terrace portion, and this position The terrace length can be derived easily and accurately simply by obtaining the horizontal distance between the wall and the furnace wall.

  Moreover, when the terrace part is formed in the surface profile, the estimated shape line 50 includes a straight part 52 located in the vicinity of the furnace wall, a connection curve part 53 extending from the furnace center side end of the straight part 52, and By including an inclined portion 54 extending from the furnace center side end portion of the connection curve portion 53 and having a constant downward slope toward the furnace center, the furnace wall side of the estimated shape line 50 is the terrace portion of the actual surface profile. In addition to the shape approximated to the side, the influence of noise at the relevant part can be further suppressed by imitating the vicinity of the actual terrace portion with a simple line in which the straight portion 52, the connecting curve portion 53, and the inclined portion 54 are continuous.

  Specifically, when the charge is charged into the blast furnace in normal blast furnace operation, it is necessary to adjust the surface profile in order to stably maintain the operation of the blast furnace. The charge is charged while changing the dropping position along the radial direction of the blast furnace by a chute or a bale). As a result of analyzing the data of many surface profiles such as past performance data in such an operating state, in the blast furnace in operation, in many surface profiles, the surface profile at the furnace radius at a predetermined position has a curved line. In this line, a straight line 52 near the furnace wall and an inclined part that is located on the furnace center side of the straight line 52 and has a constant downward gradient toward the furnace center are included in this line. 54 and a central curve portion 55 that bulges upward in the furnace center portion tend to appear. Moreover, since the linear part 52 and the inclined part 54 are located on the continuous surface profile, the furnace center side end of the linear part 52 and the furnace wall side end of the inclined part 54 are curved (connection curve). Part 53) for smooth connection. Therefore, for example, the estimated shape line 50 including the straight portion 52, the connecting curve portion 53, and the inclined portion 54 in order from the furnace wall toward the furnace center side simulates the surface profile on which the terrace portion is formed. The estimated shape line 50 approximated to the profile is obtained, and the surface profile is simulated by the simple shape estimated shape line 50 in which the straight portion 52, the connecting curve portion 53, and the inclined portion 54 are arranged on the furnace wall side. The influence of is further suppressed.

  In this embodiment, the estimated shape line 50 is defined by a continuous function F with an unknown coefficient represented on the XY plane with the furnace center axis as the Y axis and the furnace radius at a predetermined position as the X axis. The functions f11, f21, f12, and f22 are expressed in the form of Y = f (X), and the handling becomes easy. As a result, it is easy to calculate the coefficients and the ranges in the X-axis direction in each of the interval functions f11, f21, f12, and f22 based on the measured values obtained by measuring the surface profile, and it is easy to derive the estimated shape line 50.

  In addition, the continuous function F is divided into a plurality of sections of a straight section L1, a connecting curve section L2, an inclined section L3, and a central curve section L4, and a section that defines a line in accordance with the surface profile for each of the divided sections. By setting the functions f11, f21, f12, and f22, it is possible to obtain the estimated shape line 50 that more closely approximates the actual surface profile, and as a result, the terrace length can be derived more accurately. In addition, since the estimated shape line 50 is defined by a series of the section functions f11, f21, f12, and f22 that are so small (four in the present embodiment), the section functions f11, f11, f, Calculation of the coefficients in f21, f12, and f22 and the range in the X-axis direction is facilitated, and derivation of the estimated shape line 50 is facilitated.

  Specifically, in the present embodiment, the lines defined by the first linear function f11, the first curve function f21, the second linear function f12, and the second curve function f22 are respectively connected in series. By defining the estimated shape line 50, whether or not charging of the charge into the center of the furnace (center charging) is performed when a new charge is charged into the blast furnace. It is possible to obtain an estimated shape line 50 having a shape conforming to the surface profile of the charge. As a result, the terrace length can be derived with high accuracy.

  In the present embodiment, the first curve function and the second curve function are functions having a constant angle change rate with respect to the position in the X-axis direction at the angle between the tangent line of the curve defined by each curve function and the X-axis. Specifically, the first curve function is represented by the above equation (10), and the second curve function is represented by the above equation (13). Thus, since each curve function is a simple function and has few coefficients, it is easy to calculate the coefficient of each function and the range in the X-axis direction based on the measurement value by the measurement unit 12.

  In the operating blast furnace, the surface profiles in a plurality of states are respectively measured by the measuring means 12, and the terrace length measuring method (estimated shape) according to the first embodiment is based on the measured values obtained by the measurement. FIG. 8A to FIG. 8D show the results of deriving the terrace length by the measurement method using the line 50 and the threshold value. From these results, it can be confirmed that the position of the end of the terrace on the furnace center side in the surface profile in various states can be obtained with high accuracy by using the above terrace length measurement method.

  Next, a second embodiment of the present invention will be described with reference to FIG. 9 and FIG. 10. The same reference numerals are used for the same components as those in the first embodiment, and detailed descriptions are omitted, and different components are described. Only the details will be described.

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

  The receiving unit 30 is connected to a control unit or the like of the blast furnace and is a part that receives charging information transmitted from the control unit or the like as an output signal. The charging information received by the receiving unit 30 is whether or not charging of the charging material into the furnace center portion (center charging) was performed when charging a new charging material into the blast furnace. Information. The terrace length deriving means 20 is not limited to the configuration in which the receiving information sent from the outside is received by the receiving unit 30 as an output signal, but the input information is input by an operator who operates the blast furnace. It may be configured to be input from. For example, the input unit includes a keyboard and a touch panel.

  The charging information storage unit 32 is a part that stores information on the presence / absence of central charging (charging information) received by the receiving unit 30. In addition, when the terrace length deriving means 20 is provided with the input unit, the charging information storage unit 32 also stores the charging information input from the input unit.

  The function storage unit 121 stores two continuous functions F1 and F2 whose coefficients are undetermined. Specifically, in addition to the first continuous function F1 defined by a series of four functions f11, f21, f12, and f22 as in the first embodiment, a series of three functions f13, f23, and f14. The prescribed second continuous function F2 is stored.

  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. The straight line portion 52, the inclined portion 54, and the straight portion 52 And a connecting curve portion 53 that smoothly connects the inclined portion 54 (see FIG. 10).

  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 corresponds to the straight section L1 corresponding to the straight section 52, the connection curve section L2 corresponding to the connection curve section 53, and the inclined section 54 from the furnace wall toward the furnace center along the X axis. It is divided into three sections, an inclined section L3. That is, the second continuous function F2 is divided so as to be smaller than the first continuous function F1 by the center curve section L4. With respect to these three sections, the three section functions defined respectively have a third primary function in which the line defined by the corresponding section function is a straight line corresponding to the straight section 52 in order from the furnace wall toward the furnace center side. A function f13, a third curve function f23 in which the line becomes a curve corresponding to the connection curve portion 53, and a fourth linear function f14 in which the line becomes a straight line corresponding to the inclined portion 54.

If each function f13, f14, f23 is shown more concretely, the third linear function f13 is
y = e ₁₁ x + f ₁₁ (hereinafter, also simply referred to as “formula (110)”)
And the fourth linear function f14 is
y = e ₁₂ x + f ₁₂ (hereinafter also simply referred to as “formula (112)”)
It is represented by The third curve function f23 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 122 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. 11 to 14.

  When a new charge is charged into the blast furnace, the receiving unit 30 of the terrace length deriving means 20 receives the charging information transmitted as an output signal from the control unit of the blast furnace. The incoming information is stored in the charging information storage unit 32 (step S0).

  Next, a surface profile at a predetermined furnace radius (X axis) of the newly charged material is measured by the measuring unit 12, and the measured value obtained by this measurement is obtained as a terrace length deriving unit 20 (coefficient An output signal is transmitted to the calculation unit 122) (step S1). 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. 12).

  Note that the number of measurement points on the X-axis does not need to be changed depending on whether or not the center insertion is performed as in the present embodiment, and may be the same number.

  The coefficient calculation unit 122 that has received the output signal from the measurement unit 12 adds the function storage unit 121 to the measurement value obtained from the output signal based on the information on the presence / absence of the center insertion stored in the insertion information storage unit 32. The coefficient of the continuous function F1 or F2 is derived by fitting the first continuous function F1 (see FIG. 3) or the second continuous function F2 (see FIG. 10) stored in (Step S2a).

  Specifically, when the information stored in the charging information storage unit 32 is information on the central charging of the charging material, the coefficient calculation unit 122 performs the measurement obtained by the measurement of 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 end position deriving unit 24 derives the estimated shape line 50 or 150 based on the continuous function F1 or F2 stored in the coefficient calculating unit 122 (see FIG. 6 or FIG. 13). As described above, the coefficient of the continuous function F1 or F2 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 52 and the inclination portion 54 are calculated. The gradient and length, the shape of the connecting curve portion 53, and the like are determined, that is, the coefficient of each interval function and the range in the X-axis direction are respectively determined, and the estimated shape line 50 or 150 approximated to the actual surface profile is obtained. Obtainable. The end position deriving unit 24 specifies the connection curve portion 53 from the estimated shape line 50 or 150 when the estimated shape line 50 or 150 derived in this way includes the connection curve portion 53. (Step S3).

  Next, the end position deriving unit 24 stores the value of the inclination angle with respect to the horizontal direction of the tangent of the connection curve portion 53 (the estimated shape line 50 or 150) in the identified connection curve portion 53 in the threshold storage unit 23. The position on the X axis that is the threshold value is calculated as the end position on the furnace center side of the terrace (end position on the X axis). In the end position deriving unit 24 of the present embodiment, the position at which the angle of the tangent is 7 ° with respect to the horizontal direction (X axis) as in the first embodiment is set as the end position on the furnace center side of the terrace section. Calculate (see FIG. 7 or FIG. 14). The end position derivation unit 24 stores position information on the X axis of the end position of the terrace portion on the furnace center side (step S4).

  The terrace length deriving unit 25 derives a horizontal distance from the end position where the position information is stored in the end position deriving unit 24 to the furnace wall, and outputs the horizontal distance as a terrace length value by an output signal. It transmits to the means 14 (step S5). As described above, the position where the value of the tangent in the connection curve portion 53 of the estimated shape line 50 or 150 coincides with the preset threshold value is set as the end portion position on the furnace center side of the terrace portion, so that an accurate terrace can be obtained. The length can be derived.

  The output means 14 that has received this output signal displays the value (step S6). When the end position deriving unit 24 determines that the connection curve portion 53 is not included in the estimated shape line 50 or 150, the output means 14 displays that there is no terrace portion.

  The continuous function F1 or F2 used when the coefficient calculation unit 122 derives the estimated shape line 50 or 150 based on the charging information acquired from the blast furnace or the like and stored in the charging information storage unit 32 as described above. By adopting the switching configuration, it is possible to derive the estimated shape line 50 or 150 having a shape conforming to the surface profile in a shorter time. That is, by making the coefficient calculation unit 122 switchable as described above, the calculation when the center charging is not performed is facilitated, and the first continuous function F1 is used regardless of whether or not the center charging is performed. Compared to the case where the estimated shape line 50 is derived, it is possible to derive the estimated shape line 150 having a shape more suitable for the profile of the charge in a shorter time. In addition, the system can be easily constructed and managed.

  Next, a third embodiment of the present invention will be described with reference to FIGS. 15 to 18, but the same reference numerals are used for the same configurations as in the first embodiment and the second embodiment, and a detailed description thereof is omitted. Only the different configurations will be described in detail.

  The measuring apparatus 210 according to the present embodiment can detect a terrace portion having a small terrace length near the furnace wall with higher accuracy than in the first and second embodiments. Specifically, in the measuring apparatuses 10 and 110 according to the first and second embodiments, the surface profile of the entire radial direction is macroscopically detected based on the measured values from the entire furnace radial direction from the furnace center to the furnace wall. Therefore, the terrace portion with a small terrace length in the vicinity of the furnace wall may not be detected as a horizontal or substantially horizontal surface, but as a part of an inclined surface falling from the vicinity of the furnace wall toward the furnace center. (See FIG. 16). On the other hand, the measurement apparatus 310 of the present embodiment, as described above, in the detection of the macroscopic terrace portion based on the measurement values from the entire furnace radial direction, even when the terrace portion cannot be determined, Then, only the measurement in the vicinity of the furnace wall (furnace wall side area A: see FIG. 16) is extracted, and only the profile shape in the furnace wall side area A of the surface profile is microscopically detected based on the measured value. By doing so, a terrace portion having a small terrace length can be detected.

  As shown in FIG. 15, the measuring apparatus 210 includes a measuring unit 12, a terrace length deriving unit 215, and an output unit 14.

  The terrace length deriving unit 215 calculates the terrace length based on all the measurement values (33 measurement values in this embodiment) at each measurement position along the furnace radius at the predetermined position obtained from the measurement unit 12. A first deriving unit 20 for deriving and a second deriving unit (partial measurement value terrace) for deriving the terrace length based only on the measurement values in the vicinity of the furnace wall among the plurality of measurement values obtained from the measurement means 12 Detection unit) 220.

  The first deriving unit 20 is configured in the same manner as the terrace length deriving unit in the first embodiment, and includes a function storage unit 21, a coefficient calculation unit 22, a threshold storage unit 23, an end position deriving unit 24, and a terrace length deriving unit. Part 25. When the measurement values from the measurement positions arranged along the furnace deformation at a predetermined position are transmitted from the measurement unit 12 to the terrace length deriving unit 215, the first deriving unit 20 is more than the second deriving unit 220. This is the part where the terrace length is derived first (or the presence or absence of the terrace portion). Specifically, the first deriving unit 20 derives the terrace length based on each measurement value obtained from the entire furnace radius by the measuring means 12.

  When the second derivation unit 220 cannot detect the terrace portion of the surface profile in the first derivation unit 20, the second derivation unit 220 again derives the terrace length based only on the measured value near the furnace wall. is there. That is, the second derivation unit 220 is different from the first derivation unit 20 that detects the terrace portion based on the measurement values measured over the entire furnace radius, and the furnace wall side determined in advance from the furnace wall at the furnace radius. The terrace length is derived based only on the measured value obtained in the area A (see FIG. 16).

  Here, the furnace wall side area A is an area near the furnace wall. Specifically, as shown in FIG. 16, the furnace wall side region A has an estimated shape line 50 or 150 (FIG. 3 and FIG. 10) using measurement values measured over the entire furnace radius in the first derivation unit 20. (See below), the terrace cannot be detected. That is, it is detected as a part of the inclined surface as described above, but each measurement along the X-axis direction with the furnace central axis as the Y-axis and the furnace radial direction as the X-axis. This is a region including a terrace portion having a small terrace length in the vicinity of the furnace wall, which can be visually recognized by a blast furnace related person or the like from a graph in which measured values at points are plotted. In this embodiment, the furnace radius is 3.5 m, the measurement points by the measuring means 12 are 33 points (locations), and the pitch of the measurement points is 10 cm. In this case, the furnace wall side region A is 4 from the furnace wall inner surface. This is the range up to the point or the fifth measurement point P4 or P5. The range of the furnace wall side region A varies depending on the shape of the blast furnace, the type and particle size of the material charged in the blast furnace, the number and pitch of measurement points, the operating conditions of the blast furnace, and the like. This is because the tendency of the surface profile formed in the blast furnace differs when the shape of the blast furnace, the type of charge, the particle size, and the like are different.

  For example, among the measurement values obtained in the furnace wall side region A, the second derivation unit 220 has the height position of the measurement point (radius position) P1 closest to the furnace wall side and the center side from the measurement point P1. The terrace portion in the furnace wall side region A is detected based on the height difference (or depth difference) from the height position of the measurement point P2 separated by a predetermined distance. Specifically, the second deriving unit 220 stores a predetermined height difference threshold (see FIG. 17) in advance, and the height difference between the measurement points P1 and P2 (hereinafter simply referred to as “measurement”). The value of the height difference between the points P1 and P2 is also referred to as a height difference threshold value. Then, the second deriving unit 220 determines that there is a terrace portion if the height difference value is smaller than the height difference threshold value, and determines that there is no terrace portion if the height difference value is greater than the height difference threshold value. These determinations are output to the output means 14.

  As shown in FIG. 17, the height difference threshold is obtained by collecting the surface profile data that the terrace portion could not detect in the first derivation unit 20, and plotting each measured value on the XY coordinates as described above. It is a value derived by plotting a mark that is determined to have a terrace portion by visual inspection by a person concerned with ironmaking in a blast furnace and a portion that is determined not to have a terrace portion. For this reason, the height difference threshold varies depending on the shape of the blast furnace, the type of charge, the particle size, and the like.

  In the present embodiment, the terrace portion in the furnace wall side region A is detected based on the height difference between the adjacent measurement points P1 and P2. However, the present invention is not limited to this. For example, the measurement point P1 and the third and fourth measurement points P3 and P4 from the measurement point P1 toward the furnace center depend on the shape of the blast furnace, the type and particle size of the charge, and the like. Detection of the terrace portion may be performed based on the difference in height.

  The measuring apparatus 210 according to the present embodiment has the above-described configuration. Next, the operation of the measuring apparatus 210 will be described with reference to FIGS. 3 and 18.

  First, depth data (height position of the surface profile) is measured at each of a plurality of (33 in the present embodiment) measurement positions arranged along the furnace radius at a predetermined position by the measurement means 12, and each obtained measurement value is obtained. It is transmitted to the terrace length deriving means 215 (coefficient calculation unit 22) (step S1).

  The coefficient calculation unit 22 that has received the output signal receives all the measured values, that is, all the measured values respectively measured at a plurality of measurement positions arranged over the entire radial direction of the furnace radius at a predetermined position (this embodiment). In the embodiment, by applying the continuous function F to the measurement values at 33 measurement points), the coefficients of the continuous function F (coefficients of the interval functions f11, f21, f12, and f22 and ranges in the X-axis direction) are derived. The result is stored (step S2).

  Based on the continuous function F stored in the coefficient calculation unit 22, the end position deriving unit 24 derives an estimated shape line 50, and determines the presence or absence of the connection curve portion 53 in the estimated shape line 50 (step S3a). ).

  When the end position deriving unit 24 determines that the connection curve portion 53 is not included in the estimated shape line 50, the second deriving unit 220 is based only on the measurement value obtained in the furnace wall side region A. The terrace portion is detected (step S4a). That is, the surface profile of the entire furnace radius is detected by detecting the terrace portion using only the measurement values obtained in the furnace wall side region A, which is a microscopic range near the furnace wall at the furnace radius. Compared to the case, the surface profile in the vicinity of the furnace wall can be detected with higher accuracy, and thereby the estimation derived based on the measurement values obtained from the entire furnace radius (33 measurement values in the present embodiment). This makes it possible to detect a terrace portion having a small terrace length near the furnace wall that cannot be detected from the shape line 50.

  Specifically, in the second derivation unit 220, the value of the height difference (depth difference) between the measurement points P1 and P2 (see FIG. 16) spaced in the furnace radial direction is stored in advance. The terrace portion is detected by comparison with the elevation difference threshold.

  When the value of the height difference between the measurement points P1 and P2 is smaller than the height difference threshold, the second derivation unit 220 outputs an output signal indicating that the terrace is present in the output means 14, and proceeds to step S6. In this embodiment, when the terrace part is not detected by the first derivation unit 20 and the terrace part is detected by the second derivation unit 220, the position of the measurement point P2 is the end of the terrace part on the furnace center side. Assuming that it is a position, each measured value of the measuring means 12 is plotted on a graph, and matches or approximates the end position on the furnace center side of the terrace portion recognized by the blast furnace personnel concerned etc. The position of the measurement point P2 is estimated as the end position on the furnace center side of the terrace portion. Therefore, in this embodiment, when the value of the height difference between the measurement points P1 and P2 is smaller than the height difference threshold, the second derivation unit 220 has the end position on the furnace center side as the position of the measurement point P2. An output signal indicating that there is a terrace portion is output to the output means 14. On the other hand, when the value of the height difference between the measurement points P1 and P2 is larger than the height difference threshold, the second derivation unit 220 outputs an output signal indicating that there is no terrace portion (or the terrace length is 0). It outputs to the output means 14, and progresses to step S6.

  On the other hand, when the end position deriving unit 24 determines that the connection curve portion 53 is included in the derived estimated shape line 50 in step S3a, the end position deriving unit 24 identifies the connection curve portion 53. Then, the end position deriving unit 24 is a position on the X axis where the value of the inclination angle with respect to the horizontal direction of the tangent of the connection curve unit 53 in the identified connection curve unit 53 is a threshold value stored in the threshold value storage unit 23. Is calculated as the end position of the terrace portion on the furnace center side, and this position information is stored (step S4). The terrace length deriving unit 25 derives a horizontal distance from the end position where the position information is stored in the end position deriving unit 24 to the furnace wall, and outputs this horizontal distance as a terrace length value as an output signal. It transmits to the means 14 (step S5).

  The output means 14 that has received the output signal from the end position deriving unit 24 or the second deriving unit 220 determines the measurement results (for example, the presence / absence of a terrace portion, the terrace length, the end position of the terrace portion on the furnace center side, etc.). Is displayed (step S6).

  As described above, the terrace portion with a small terrace length near the furnace wall where the terrace length is derived as 0 by deriving the terrace length based on the measurement values from all the measurement points P1 to P33. Even if it exists, it becomes possible to detect by detecting the terrace portion based only on the measurement values (values of the height positions at the measurement points P1 and P2) obtained in the furnace wall side region A. . In addition, in the second derivation unit 220, the height difference value at two points (measurement points P1 and P2) spaced apart from each other in the furnace radial direction in the furnace wall side region A is compared with the height difference threshold value. The presence or absence of a terrace portion with a small terrace length near the furnace wall can be accurately determined.

  In the measuring apparatus 210, the specific configuration of the second derivation unit 220 is not limited to the above configuration. For example, the second deriving unit 220 of the present embodiment detects the terrace portion by comparing the height difference value between the measurement points P1 and P2 and the height difference threshold, but the present invention is not limited to this. . In other words, the second deriving unit 220 is configured to detect a terrace portion having a small terrace length that is not detected by the first deriving unit 20 based only on the measurement value in the furnace wall side region A. Good.

  For example, the second deriving unit 220 is not detected by the first deriving unit 20 by deriving a partial estimated shape line that is a line that simulates the profile shape in the furnace wall side region A of the surface profile. Alternatively, detection of a terrace portion having a small terrace length may be performed.

  Specifically, for example, as illustrated in FIGS. 19 and 22A, the second derivation unit 320 of the measurement apparatus 310 includes an intra-region function storage unit 321, an intra-region function coefficient calculation unit 322, and a partial shape. A line threshold storage unit 323, an in-region end position deriving unit 324, and an in-region terrace length deriving unit 325 are provided.

  The intra-area function storage unit 321 stores the intra-area continuous function F3. This in-region continuous function F3 defines a partial estimated shape line 350 (see FIGS. 22A and 22B) for imitating the surface profile in the furnace wall side region A at the furnace radius at a predetermined position. The partial estimated shape line 350 is defined as a single smooth line. Further, the partial estimated shape line 350 includes a portion where the height position decreases from the position of the inner surface of the furnace wall toward the furnace center and the gradient increases as it goes toward the furnace center. The partial estimated shape line 350 of the present embodiment is a curve that bulges upward.

The in-region continuous function F3 set in this way 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. Specifically, the in-region continuous function F3 is
y = (− 1 / d) · log | cos (dx + e) | + f (hereinafter also simply referred to as “expression (311)”)
It is represented by The intra-region continuous function F3 is
y = δx ² + εx + ζ (hereinafter also simply referred to as “formula (313)”)
The function represented by may be sufficient. Here, d, e, f, δ, ε, and ζ are coefficients. The intra-region continuous function F3 is not limited to the above two types of functions (Equations (311) and (313)). That is, the intra-region continuous function F3 is the above two types of functions (formula (311), if the line defined by the intra-region continuous function F3 approximates the shape near the terrace portion of the surface profile, A function other than (313)) may be used.

  The in-region function coefficient calculation unit 322 calculates the coefficient of the in-region continuous function F3 stored in the in-region function storage unit 321 based on the measurement value obtained in the furnace wall side region A, and this calculated This is a part for storing the in-region continuous function F3 into which the coefficient is substituted. Specifically, the in-region function coefficient calculation unit 322 calculates the coefficient of the in-region continuous function F3 based on a predetermined number (number) of the measured values obtained in the furnace wall side region A. calculate. In the present embodiment, the measurement value used by the in-region function coefficient calculation unit 322 to calculate the coefficient is the furnace center from the measurement point (measurement position) P1 closest to the furnace wall among the plurality of measurement positions in the furnace wall side area A. The measured values at the measurement points P1 to P4 up to the fourth measurement point (measurement position) P4 toward the side.

  The partial shape line threshold storage unit 323 stores a partial shape line threshold. This partial shape line threshold is a terrace with a small terrace length in the vicinity of the furnace wall that is judged to have no terrace in the derivation of the terrace length based on the estimated shape line 50 or 150 (see FIGS. 3 and 10). This is a value for defining the furnace center side end portion of the terrace portion in the furnace radial direction when the portion is detected based on the partial estimated shape line 350. The partial shape line threshold is a value obtained by analyzing a number of past surface profile data of the blast furnace. In the present embodiment, the threshold stored in the threshold storage unit 23 of the first derivation unit 20 and the partial shape line threshold are the same value (7 ° in the present embodiment). The threshold and the partial shape line threshold need not use the same value, and different values may be used.

  The region inner edge position deriving unit 324 is based on the partial shape line threshold stored in the partial shape line threshold storage unit 323 and the intra-region continuous function F3 stored in the region function coefficient calculating unit 322. This is a part that calculates the position of the end of the profile terrace on the furnace center side in the X-axis direction and stores the position information of the calculated end.

  Specifically, the intra-region end position deriving unit 324 derives a partial estimated shape line 350 from the intra-region continuous function F3 stored in the intra-region function coefficient calculating unit 322, and a curved portion is included in the partial estimated shape line 350. Judge whether it is included. When the curved portion is included, the region inner edge position deriving unit 324 uses the partial shape line threshold value storage unit 323 for the value of the inclination angle with respect to the horizontal direction of the tangent to the curved portion. A position serving as a threshold is derived, and if this position is within the furnace wall side region A, the position is stored as the end position on the furnace center side of the terrace portion on the X axis. On the other hand, when the position serving as the partial shape line threshold is not in the furnace wall side region A, and when the curved portion is not included in the partial estimated shape line 350, the region inner end position deriving unit 324 is It is determined that the end position of the terrace portion on the furnace center side is the same position as the furnace wall position, and the result is stored.

  The in-region terrace length deriving unit 325 is configured based on the distance from the end position on the furnace center side to the furnace wall (furnace wall inner surface) of the terrace portion in which position information is stored in the in-region end position deriving unit 324. The length is derived, and the result is transmitted to the output means 14 as an output signal.

  In such a measuring device 310, the terrace length is measured as follows.

  First, depth data (height position of the surface profile) is measured at a plurality of (33 in the present embodiment) measurement positions arranged along the furnace radius at a predetermined position by the measurement means 12 (see FIG. 21A). Each obtained measurement value is transmitted to the terrace length deriving unit 315 (the coefficient calculating unit 22 of the first deriving unit 20) (step S1).

  The coefficient calculation unit 22 that has received the output signal applies the continuous function F to all the received measurement values, so that the coefficients of the continuous function F (see FIG. 3) (of each of the interval functions f11, f21, f12, and f22). A coefficient and a range in the X-axis direction are derived, and the result is stored (step S2).

  Based on the continuous function F stored in the coefficient calculation unit 22, the end position derivation unit 24 derives an estimated shape line 50, and determines whether or not the connection curve portion 53 is included in the estimated shape line 50. Judgment is made (step S3a). The end position derivation unit 24 identifies the connection curve portion 53 when the connection curve portion 53 is included.

  When the end position deriving unit 24 determines that the connection curve portion 53 is not included in the estimated shape line 50, the second deriving unit 220 is based only on the measurement value obtained in the furnace wall side region A. The terrace portion is detected (steps S4b to S6b).

  Specifically, in the first deriving unit 20, when the end position deriving unit 24 determines that the connection curve unit 53 is not included in the estimated shape line 50, the in-region function coefficient calculating unit 322 performs measurement from the measuring unit 12. Measurement values at points P1 to P4 are acquired. The intra-region function coefficient calculation unit 322 acquires the intra-region continuous function F3 stored in the intra-region function storage unit 321, and substitutes the measurement value acquired from the measuring unit 12 for the intra-region continuous function F3. An undetermined coefficient of the inner continuous function F3 is calculated. (Step S4b). The intra-area function coefficient calculation unit 322 stores the intra-area continuous function F3 into which the calculated coefficient is substituted.

  Next, the intra-region end position deriving unit 324 derives a partial estimated shape line 350 based on the intra-region continuous function F3 stored in the intra-region function coefficient calculating unit 322 (see FIG. 22A). It is determined whether or not the derived partial estimated shape line 350 includes a curved portion. At this time, since the partial estimated shape line 350 is derived based only on the measurement values of the measurement points P1 to P4, the partial estimated shape line 350 approximated to the surface profile in the furnace wall side region A is derived, and the terrace length Even a small terrace can be detected with high accuracy. On the other hand, the first deriving unit 20 derives the estimated shape line 50 that simulates the entire surface profile based on all the measurement values of the measurement points P1 to P33. Even if a small terrace portion is formed, it is included in the inclined surface inclined from the vicinity of the furnace wall toward the furnace center portion, and was not detected as a horizontal or substantially horizontal portion (terrace portion) (see FIG. 21B). ).

  The region inner end position deriving unit 324 determines whether or not the derived position is within the furnace wall side region A. If the derived position is within the furnace wall side region A, the derived position is set to the terrace portion on the X axis. Stored as the end position on the furnace center side (step S5b).

  The in-region terrace length deriving unit 325 derives the horizontal distance from the stored end position to the furnace wall, and transmits this horizontal distance as a terrace length value to the output means 14 by an output signal (step S6b). ), Go to step S6. Further, the in-region terrace length deriving unit 325 determines that the position in the region inner end position deriving unit 324 is not in the furnace wall side region A at the position serving as the partial shape line threshold, and the partial estimated shape If it is determined that the curved portion is not included in the line 350, an output signal indicating that there is no terrace portion (or the terrace length is 0) is output to the output means 14, and the process proceeds to step S6.

  On the other hand, when the end position deriving unit 24 determines that the connection curve portion 53 is included in the derived estimated shape line 50 in step S3a, the end position deriving unit 24 identifies the connection curve portion 53. Then, the end position deriving unit 24 is a position on the X axis where the value of the inclination angle with respect to the horizontal direction of the tangent of the connection curve unit 53 in the identified connection curve unit 53 is a threshold value stored in the threshold value storage unit 23. Is calculated as the end position of the terrace portion on the furnace center side, and this position information is stored (step S4). The terrace length deriving unit 25 derives a horizontal distance from the end position where the position information is stored in the end position deriving unit 24 to the furnace wall, and outputs this horizontal distance as a terrace length value as an output signal. It transmits to the means 14 (step S5).

  The output means 14 that has received the output signal from the end position deriving unit 24 or the second deriving unit 320 determines the measurement results (for example, the presence or absence of the terrace portion, the terrace length, the end portion position of the terrace portion on the furnace center side, etc.). Is displayed (step S6).

  As described above, in the measuring apparatus 310, the terrace length in the vicinity of the furnace wall such that the terrace length is derived as 0 by deriving the terrace length based on the measurement values from all the measurement points P1 to P33. Can be detected by detecting the terrace based only on the measured values (measured values at the measurement points P1 to P4) obtained in the furnace wall side region A. It becomes.

  Specifically, the terrace length in the vicinity of the furnace wall is small by deriving the partial estimated shape line 350 as one smooth line based on the four measurement values obtained in the furnace wall side region A. A partial estimated shape line 350 approximating the surface profile of the terrace portion is obtained. The position where the value of the inclination angle with respect to the horizontal direction of the tangent to the partial estimated shape line 350 having a shape approximated to this surface profile is the threshold value for the partial shape line is calculated as the position of the end portion on the furnace center side of the terrace portion. Based on the distance to the furnace wall, the terrace length of the terrace portion formed only in the vicinity of the furnace wall is derived with high accuracy.

  The blast furnace measuring apparatus of the present invention is not limited to the first to third embodiments, and various modifications can be made without departing from the scope of the present invention.

  For example, the threshold value (or the partial shape line threshold value) in the first to third embodiments is 7 °, but is not limited to this. That is, the position of the end portion of the terrace portion on the estimated shape line 50 or 150 or the partial estimated shape line 350 on the furnace center side is manufactured by a blast furnace using the measurement apparatus 10 (or 110, 210, 310). If it is different from the judgment of the person concerned, the threshold value may be changed to match this judgment.

  Specifically, the position to be determined as the terrace portion from the inner surface of the furnace wall toward the furnace center side of the surface profile may differ depending on the iron making personnel for each blast furnace. For this reason, the end position of the derived terrace portion may be different from the judgment of a person involved in the blast furnace making use of the measurement apparatus 10 (or 110, 210, 310). In such a case, the end position of the terrace portion can be changed along the furnace radial direction in the same surface profile by changing the threshold value (or the partial shape line threshold value). Specifically, the end position moves to the furnace center side by increasing the value of the threshold value (or partial shape line threshold value), and the threshold value (or partial shape line threshold value) is decreased by decreasing the value of the threshold value (or partial shape line threshold value). The end position moves to the furnace wall side. In this way, once the threshold value (or partial shape line threshold value) is adjusted so that the end position of the terrace portion matches the judgment of the ironmaking personnel, the threshold value (or partial shape line value) is thereafter obtained. For example, it is possible to derive the terrace length that matches the judgment of the iron making related person.

  In the first to fourth embodiments, the continuous function F or the first continuous function F1 defined by the four interval functions f11, f12, f21, and f22 is stored in the function storage unit 21 or 121. In the measuring apparatus used in the blast furnace that operates without charging, the function storage unit 21 stores only the second continuous function F2 defined by the three interval functions f13, f23, and f14. It may be configured.

  When the central charging is not performed in this way, only three lines respectively defined by the three interval functions f13, f23, and f14 are connected in series, and conform to the surface profile of the charge. The estimated shape line 150 of the shape can be obtained. Thus, when the number of interval functions decreases, the coefficients of the second continuous function F2 (the coefficients of the interval functions f13, f23, and f14 and the ranges on the X axis of the interval functions f13, f23, and f14) are calculated. As a result, the time for deriving the terrace length is reduced.

  In the first to third embodiments, the continuous function F and the first continuous function F1 are defined by arranging the above formulas (10) to (13) in order from the furnace wall to the furnace center side. However, it need not be limited to this. Specifically, in the first continuous function F1, each function defining the connection curve portion 53 and the center curve portion 55 is expressed in the x-axis direction at the angle formed by the tangent line of the curve defined by the function and the x-axis. Any function may be used as long as the angle change rate with respect to the position is constant. For example, in the first continuous function F1, the function that defines the connection curve portion 53 and the function that defines the center curve portion 55 are opposite, that is, the function that defines the connection curve portion 53 is centered in the above equation (13). The function that defines the curved portion 55 may be the above equation (11), and the function that defines the connection curve portion 53 and the function that defines the central curve portion 55, that is, the connection curve portion 53 is defined. The function that defines the center curve portion 55 and the function that defines the central curve portion 55 may both be the above formula (11) or the above formula (13). Also in the second continuous function F2, the interval function defining the connection curve portion 53 has a constant angle change rate with respect to the position in the x-axis direction at the angle formed by the tangent to the curve defined by the function and the x-axis. The above function (13) may be sufficient.

  Further, the number of functions defining the continuous function is not limited to three or four, and may be five or more.

  Further, unlike the estimated shape line 50 or 150 of the first to third embodiments, the horizontal or substantially horizontal straight portion 52 does not need to be positioned at the end portion on the furnace wall side, but suddenly from the position of the inner surface of the furnace wall. The estimated shape line may be a portion where the height position decreases toward the center and the gradient increases toward the furnace center. Even in this case, the position where the value of the inclination angle with respect to the horizontal direction of the tangent to the part becomes the threshold value is calculated as the position of the end portion on the furnace center side of the terrace portion, and only the horizontal distance between this position and the furnace wall is obtained. The terrace length can be derived easily and accurately.

  In the measurement apparatus 310 including the second deriving unit 320 of the third embodiment, when the partial estimated shape line 350 is derived, four measurement values at the measurement points P1 to P4 are used. The number is not limited to this number. The measurement value required by the in-region function coefficient calculation unit 322 is at least the in-region continuous function F3 from the plurality of measurement points in the furnace wall side region A toward the furnace center side from the most measurement point P1 on the furnace wall side. The measurement values at each measurement point up to the number of measurement points (number) of the undetermined coefficients included in the measurement are sufficient. Thus, if there are more measurement values than the number (number) of undetermined coefficients included in the intra-region continuous function F3, all the values of the undetermined coefficients included in the intra-region continuous function F3 can be calculated. Thus, the partial estimated shape line 350 can be derived.

  In this embodiment, since the in-region continuous function F3 including three undetermined coefficients is used, three measurement values are required at a minimum. In the measuring apparatus 310, a partial estimated shape line 350 derived based on the three measured values on the furnace wall side is shown in FIG. The furnace center side end position of the terrace determined from the partial estimated shape line 350 is substantially the same furnace radius as the terrace center end position of the terrace determined using the four measured values on the furnace wall side. Because it is a position, it is possible to accurately detect the end position on the furnace center side of the terrace part with a small terrace length near the furnace wall, even if it is obtained based on the minimum required number of measurements. It can be confirmed that there is.

  In this embodiment, the first derivation unit 20 and the second derivation unit 320 may be configured by a common derivation unit. That is, the function storage unit 21 and the in-region function storage unit 321 are configured by a common function storage unit, the coefficient calculation unit 22 and the in-region function coefficient calculation unit 322 are configured by a common coefficient calculation unit, and a threshold storage unit 23 and the partial shape line threshold storage unit 323 are configured as a common threshold storage unit, and the end position deriving unit 24 and the region end position deriving unit 324 are configured as a common end position deriving unit. The length deriving unit 25 and the in-region terrace length deriving unit 325 may be configured as a common terrace length deriving unit. Moreover, it is not necessary to make all the structure of the 1st and 2nd derivation | leading-out parts 20 and 320 common, and it may be comprised so that a part of structure of each derivation | leading-out part 20 and 320 may be common.

10 Measuring device 12 Measuring means (microwave profile meter)
14 Output means 20 Terrace length deriving means 21 Function storage section 22 Coefficient calculation section 23 Threshold storage section 24 End position deriving section 25 Terrace length deriving section 50 Estimated shape line 52 Straight line section 53 Connection curve section 54 Inclination section 55 Center curve Part F Continuous function f11 First linear function f12 Second linear function f21 First curve function f22 Second curve function

Claims (26)

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 measuring step for measuring the top surface shape of the layer at a furnace radius at a predetermined position;
A shape line deriving step for deriving an estimated shape line that simulates the top surface shape of the layer as a single smooth line at the furnace radius at the predetermined position, based on the measurement value obtained in the measurement step;
A terrace length deriving step for deriving a terrace length based on the estimated shape line derived in the shape line deriving step;
In the terrace length deriving step, a threshold value for determining the position of the end portion on the furnace center side in the furnace radial direction of the terrace portion of the upper surface shape of the layer is set in advance, and the estimated shape derived in the shape line deriving step If the line includes a portion where the height position decreases from the position of the inner surface of the furnace wall or a position at a predetermined distance from the inner surface toward the furnace center, and the gradient increases as it goes to the furnace center. Calculate a position where the value of the inclination angle with respect to the horizontal direction of the tangent line of the estimated shape line in the region where the height position of the estimated shape line decreases and the gradient increases increases from the position to the furnace wall A method for measuring a terrace length of a blast furnace, wherein the terrace length is derived based on a distance of the blast furnace. In the measuring method of the terrace length of the blast furnace of Claim 1,
The estimated shape line includes a horizontal or substantially horizontal straight line portion located in the vicinity of the furnace wall and a curved line portion that extends from the furnace center side end portion of the straight line and is a portion where the height position decreases and the gradient increases. ,
In the terrace length deriving step, a position where the value of the inclination angle of the tangent of the curved portion in the curved portion becomes the threshold value is calculated, and the terrace length is derived based on the distance from this position to the furnace wall. 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 1 or 2,
The estimated shape line has an inclined portion that extends from a furnace center side end portion of the curved portion, which is a portion where the height position decreases and the gradient increases, and has a constant downward gradient toward the furnace center. Measuring method of terrace length of blast furnace. In the measuring method of the terrace length of the blast furnace of Claim 3,
The estimated shape line is defined by a continuous function whose coefficient is undetermined expressed 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 continuous function is along the x-axis including a straight section corresponding to the straight section, which is 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. Are defined by a series of interval functions defined for each of a plurality of sections divided by
These multiple types of interval functions are set such that the coefficient and the x-axis range are undetermined and are continuous at the boundary between adjacent interval functions,
In the shape line deriving step, 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 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 4,
The continuous function is defined by a first linear function, a first curve function, a second linear function, and a second curve function arranged in order from the furnace wall toward the furnace center side, and the first linear function is The line defined by the function is a function that becomes a straight line corresponding to the straight line portion, and the first curve function is a function that the line defined by the function becomes a curve corresponding to the curved portion. The second linear function is a function in which a line defined by the function is a straight line corresponding to the inclined portion, and the second curve function is a line defined by the function at the furnace center. A method for measuring a terrace length of a blast furnace, characterized in that the function is a curve that is located and bulges upward. In the measuring method of the terrace length of the blast furnace of Claim 4,
The continuous function is defined by a first linear function, a curve function, and a second linear function arranged in order from the furnace wall toward the furnace center, and the first linear function is a line defined by the function. A function that becomes a straight line corresponding to the straight line portion, the curve function is a function in which a line defined by the function becomes a curve corresponding to the curved portion, and the second linear function is determined by the function A method for measuring a terrace length of a blast furnace, wherein the prescribed line is a function that becomes a straight line corresponding to the inclined portion. In the measuring method of the terrace length of the blast furnace of Claim 4,
In the shape line deriving step, as a continuous function having an undetermined coefficient that defines the estimated shape line, a line defined by a corresponding function sequentially arranged from the furnace wall toward the furnace center becomes a straight line corresponding to the straight line portion. 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 the line at the furnace center portion A first continuous function defined by a second curve function that is located and bulges upward;
A third linear function in which a line defined by a corresponding function arranged in order from the furnace wall toward the furnace center becomes a straight line corresponding to the straight line portion, and a third linear function in which the line becomes a curve corresponding to the curved portion. Two continuous functions, a curve function and a second continuous function defined by a fourth linear function in which the line is a straight line corresponding to the inclined portion, are preset,
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 5 thru | or 7,
The first curve function, the second curve function, the third curve function, or the curve function is relative to a position in the x-axis direction at an angle formed by a tangent to the curve defined by the curve function and the x-axis. A method for measuring the terrace length of a blast furnace, wherein the rate of change in angle is a constant function. In the measuring method of the terrace length of the blast furnace of Claim 8,
The first curve function, the second curve function, the third curve function or the curve function is a function represented by the following expression (1) or (2): Method for measuring the terrace length of a house.
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 Claims 5 thru | or 9,
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. In the measuring method of the terrace length of the blast furnace of any one of Claims 1 thru | or 10,
In the measurement step, the corresponding portions of the upper surface of the layer are respectively measured from a plurality of measurement positions along the furnace radius at the predetermined position and arranged over the entire furnace radius. An estimated shape line is derived based on all measured values measured at the measurement position, and in the terrace length deriving step, the estimated shape line includes a portion where the height position decreases and the gradient increases. If it is determined that there is no terrace, the terrace is based only on the measurement value obtained in the predetermined furnace wall side region from the furnace wall at the furnace radius of the predetermined position among the measurement values obtained in the measurement step. A method for measuring a terrace length of a blast furnace, further comprising a partial measurement value terrace detection step for detecting a part. The method for measuring the terrace length of a blast furnace according to claim 11,
In the partial measurement value terrace detection step, the height position of the portion of the upper surface of the layer corresponding to the first measurement position closest to the furnace wall obtained in the measurement step, and the first position in the furnace wall side region. Based on the difference in height from the height position of the portion on the upper surface of the layer corresponding to the second measurement position that is a predetermined distance away from the measurement position to the furnace center side, the terrace portion in the furnace wall side region is detected. A method for measuring the terrace length of a blast furnace. The method for measuring the terrace length of a blast furnace according to claim 11,
The partial measurement value terrace detection step is based on the measurement value obtained in the furnace wall side region in the measurement step, and the partial estimation that simulates the layer upper surface shape in the furnace wall side region as a single smooth line A partial shape line deriving step for deriving a shape line;
A threshold value for partial shape line for determining the position of the furnace center side end portion in the furnace radial direction of the terrace portion is set in advance, and the inner surface of the furnace wall is set to the partial estimated shape line derived in the partial shape line derivation step. The height position of the partial estimated shape line decreases and the gradient increases when the height position decreases toward the furnace center from the position and the portion where the gradient increases toward the furnace center is included. Calculate the position where the value of the inclination angle with respect to the horizontal direction of the tangent of the partial estimated shape line in the part is the partial shape line threshold, and if this position is within the furnace wall side region, While the terrace length is derived based on the distance, when the position serving as the partial shape line threshold is not within the furnace wall side region, or the partial estimated shape line derived in the partial shape line deriving step is the height. Low position And a step of deriving a terrace length of a partial measurement value for determining that there is no terrace in the shape of the upper surface of the layer when a portion where the gradient increases is not included. . In the measuring method of the terrace length of the blast furnace of Claim 13,
The partial estimated shape line is defined by a continuous function within a region whose coefficient is undetermined expressed 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,
In the partial shape line deriving step, the partial estimated shape line is derived by calculating the coefficient based on the measured value obtained in the furnace wall side region in the measuring step. Method for measuring the terrace length of a house. In the measuring method of the terrace length of the blast furnace of Claim 14,
In the partial shape line deriving step, a predetermined number of measurements from the measurement position closest to the furnace wall side to the furnace center side among the plurality of measurement positions in the furnace wall side region measured in the measurement step. Deriving the partial estimated shape line using the measured values at each measurement position up to the position,
The method for measuring a terrace length of a blast furnace, wherein the predetermined number is at least the number of undetermined coefficients included in the continuous function in the region. In the measuring method of the terrace length of the blast furnace of Claim 14 or 15,
The in-region continuous function is a function represented by the following formula (3) or (4): A method for measuring a terrace length of a blast furnace.
y = (− 1 / d) · log | cos (dx + e) | + f (3)
y = δx ² + εx + ζ (4)
Here, d, e, f, δ, ε, and ζ are coefficients. The method for measuring a terrace length of a blast furnace according to any one of claims 13 to 16,
A method for measuring a terrace length of a blast furnace, wherein the threshold value of the terrace length deriving step and the partial shape line threshold value of the partial measurement value terrace length deriving step are the same value. 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 stores in advance a function with an indefinite coefficient that predetermines an estimated shape line that simulates the shape of the upper surface of the layer as a single smooth line at the furnace radius at the predetermined position; ,
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;
A threshold storage unit that stores in advance a threshold value for defining the furnace center side end in the furnace radial direction of the terrace portion of the layer upper surface shape;
Based on the threshold value stored in the threshold value storage unit and the continuous function stored in the coefficient calculation unit, the position of the end of the top surface of the terrace portion on the furnace radius side in the furnace radial direction is calculated, and this position An end position deriving unit for storing information;
A terrace length is derived based on the distance from the end position stored in the end position deriving section to the furnace wall, and the value of the derived terrace length is transmitted to the output means. And
The end position derivation unit has an estimated shape line defined by the continuous function stored in the coefficient calculation unit, and has a height as it moves from the position of the inner surface of the furnace wall or a predetermined distance from the inner surface toward the furnace center. In the case where a portion where the position is lowered and the gradient is increased toward the furnace center is included, the tangent of the estimated shape line in the portion where the height position of the estimated shape line is lowered and the gradient is increased. An apparatus for measuring a terrace length of a blast furnace, wherein a position at which a value of an inclination angle with respect to a horizontal direction becomes a threshold value stored in the threshold value storage unit is calculated as an end position on the furnace center side of the terrace unit. The apparatus for measuring a terrace length of a blast furnace according to claim 18,
The estimated shape line includes a horizontal or substantially horizontal straight portion located in the vicinity of the furnace wall side and a curved portion that extends from the furnace center side end portion of the straight line and is a portion where the height position decreases.
The apparatus for measuring a terrace length of a blast furnace, wherein the end position deriving unit calculates a position at which a value of an inclination angle of the tangent of the curved portion in the curved portion becomes the threshold value. The apparatus for measuring the terrace length of a blast furnace according to claim 18 or 19,
The estimated shape line has an inclined portion that extends from a furnace center side end portion of the curved portion, which is a portion where the height position decreases and the gradient increases, and has a constant downward gradient toward the furnace center. A measuring device for terrace length of blast furnace. The apparatus for measuring the terrace length of a blast furnace according to claim 20,
The estimated shape line is defined by a continuous function whose coefficient is undetermined expressed 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 continuous function is along the x-axis including a straight section corresponding to the straight section, which is 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. Are defined by a series of interval functions defined for each of a plurality of sections divided by
These multiple types of interval functions are set such that the coefficient and the x-axis range are undetermined and are continuous at the boundary between adjacent interval functions,
In the coefficient calculation unit, 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 based on the measured values. Terrace length measuring device. The apparatus for measuring the terrace length of a blast furnace according to claim 20,
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
In the function storage unit, a first linear function in which a line defined by a corresponding function arranged in order from the furnace wall toward the furnace center becomes a straight line corresponding to the straight part, and the line corresponds to the curved part A first curve function to be a curved line, a second linear function in which the line is a straight line corresponding to the inclined portion, and a second curve in which the line is located at the furnace center and bulges upward. A first continuous function defined by a curve function;
A third linear function in which a line defined by a corresponding function arranged in order from the furnace wall toward the furnace center becomes a straight line corresponding to the straight line portion, and a third linear function in which the line becomes a curve corresponding to the curved portion. Two continuous functions, a curve function and a second continuous function defined by a fourth linear function in which the line is a straight line corresponding to the inclined portion, are stored in advance,
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. The coefficient of the first continuous function stored in the part is calculated, the first continuous function obtained by substituting the calculated coefficient is stored, and the charge is not charged into the core part. In this case, a coefficient of the second continuous function stored in the function storage unit is calculated based on the measured value, and a second continuous function obtained by substituting the calculated coefficient is stored.
The end position derivation unit calculates the end position of the terrace portion on the furnace center side based on the first continuous function or the second continuous function stored in the coefficient calculation unit and the threshold value. A measuring device for the terrace length of the blast furnace. The apparatus for measuring the terrace length of a blast furnace according to any one of claims 18 to 22,
The terrace length deriving means is obtained by the coefficient calculation unit measuring each corresponding part of the upper surface of the layer from a plurality of measurement positions along the furnace radius at the predetermined position and arranged over the entire furnace radius. The measured value, and the estimated shape line is derived by calculating the coefficient of the continuous function based on all the measured values measured at each measurement position in the entire furnace radius, in the end position derivation unit, The predetermined position of the measurement value when it is determined that the estimated shape line defined by the continuous function for which the coefficient is calculated does not include a portion where the height position decreases and the gradient increases. A terrace of a blast furnace, further comprising a partial measurement value terrace detection unit that detects a terrace part based only on a measurement value obtained in a predetermined furnace wall side region from the furnace wall at a furnace radius of Length measuring device The apparatus for measuring a terrace length of a blast furnace according to claim 23,
The partial measurement value terrace detection unit is a height position of a portion of the layer upper surface corresponding to the first measurement position on the furnace wall side among the measurement values obtained by measuring the layer upper surface shape of the charge. And in the furnace wall side region based on the height difference with the height position of the portion of the upper surface of the layer corresponding to the second measurement position that is a predetermined distance away from the first measurement position to the furnace center side, An apparatus for measuring a terrace length of a blast furnace, wherein the terrace portion in the furnace wall side region is detected. The apparatus for measuring a terrace length of a blast furnace according to claim 23,
The partial measurement value terrace detection unit stores in advance a region-in-region continuous function with an indefinite coefficient that prescribes a partial estimated shape line that simulates the shape of the upper surface of the layer in the furnace wall side region as a single smooth line. An internal function storage unit;
Based on the measured value obtained in the furnace wall side region, calculate the coefficient of the continuous function in the region stored in the local function storage unit, and substituting the calculated continuous coefficient in the region An in-region function coefficient calculation unit to store;
A partial shape line threshold value storage unit for storing in advance a partial shape line threshold value for prescribing the furnace center side end in the furnace radial direction of the terrace portion of the layer upper surface shape;
In the partial estimated shape line defined by the in-region continuous function stored in the in-region function coefficient calculation unit, the height position decreases from the position of the inner surface of the furnace wall toward the furnace center, and as the gradient thereof toward the furnace center. In the case where an increasing part is included, the value of the inclination angle with respect to the horizontal direction of the tangent of the partial estimated shape line in the part where the height position of the partial estimated shape line decreases and the gradient increases is the partial shape. A position that is a partial shape line threshold value stored in the line threshold value storage unit is calculated, and if this position is within the furnace wall side region, the position is set as the end portion position on the furnace center side of the terrace portion. On the other hand, when the position serving as the partial shape line threshold is not within the furnace wall side region or when the partial estimated shape line does not include a portion where the height position decreases and the gradient increases, The same position as the furnace wall position Blast terrace length of the measuring device, characterized in that it comprises a region end position deriving unit determines that. In the measuring apparatus of the terrace length of the blast furnace of any one of Claims 18 thru | or 25,
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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