JP5779716B2 - Method and adjuster for adjusting firing completion point in sintering machine - Google Patents

Description

  The present invention relates to a method and an adjuster for adjusting a firing completion point in a sintering machine. In a sintering machine, the material to be sintered, including for example ore, is loaded into a transport path, such as a traveling grate or a grate carriage, ignited, and placed in the transport direction. It passes through the wind box operating in the suction direction and is transferred to the material discharge section. While being transferred in the sintering machine, the material to be sintered is burned to form a sintered cake, which is discharged near the material discharge at the end of the sintering machine, for example by raking off, and then discharged. Is supplied to the process. In the method for adjusting the firing completion point, temperatures determined by the temperature of the material to be sintered are measured at at least three measurement points arranged in order along the conveyance path. The conveyance speed of the sintering machine is adjusted according to the position of the maximum measurement temperature with respect to the position of the firing completion point selected in advance on the conveyance path.

  In sintering, most of the granular or powdered material is bonded together by heating. Heating is performed by igniting the material surface in a sintering machine after charging the material. The ignited material is transported over the sintering machine and fired over the entire height of the material to be sintered. At the firing completion point at which the entire sintered bed is fired in the vertical direction, the temperature measured in the vicinity of the wind box is a maximum value. Subsequently, the sintered material is further transported on the sintering machine and cooled in the meantime.

  Usually, sintering is desired to be completed at or near the end of the sintering machine. However, in any case, when the material is discharged, the sintering process is not completed and the sintering process proceeds in the next cooling station (in this case, the cooling station is damaged by the heat generated during sintering). Should be avoided). Furthermore, the situation where the firing completion point is reached too early (in this case, the production amount decreases) should be avoided.

  In order to avoid this, in the adjustment of the firing completion point, the temperature in the wind box, particularly the temperature of the wind box in the rear quarter of the sintering machine, is taken into consideration to determine the firing completion point. In this step, the temperature maximum value is determined from the measured temperature, and the firing completion temperature is determined from the temperature maximum value. The comparison determines which windbox has the temperature maximum. This determined position is compared to a position preselected for the desired firing completion point.

  If the wind box with the maximum measured temperature is located before the position selected for the desired firing completion point, the conveying speed of the sintering machine is increased by a factor set as a fixed value. If the measured temperature maximum windbox is located after the position selected for the firing completion point, the speed of the sintering machine is likewise reduced by a factor set as a fixed value.

  US Pat. No. 3,211,441 discloses a method and apparatus for adjusting the conveying speed of a sintering machine. For this purpose, the temperature and pressure of the exhaust air are measured in one of a plurality of consecutively arranged windboxes of the dwelloid sinter and whether these measured values are in the desired range. Is checked. This shows that the sintering process will be completed within the desired time frame or at the desired location of the sintering machine. In the sintering process, the maximum value at the firing completion point of the sintered bed is known from the temperature profile of the temperature measured in the continuously arranged windbox. The measured pressure of the gas sucked and exhausted through the sintering bed is substantially constant until reaching the firing completion point, and clearly decreases after reaching the firing completion point. By optimally combining the temperature range and pressure range of the exhaust air appropriately selected for the sintering machine and the process to be performed, the process in the selected window box is fired in the selected window box It can be determined whether it is in the vicinity of a point. Depending on the relationship between the two measurements, the conveying speed of the sintering machine is increased or decreased and the firing completion point is moved to the selected window box region.

  However, this adjustment is relatively expensive because it requires two different measurements to be taken into account in order to reliably determine the firing completion point. Also, for example, the absolute value of the measurement pressure may vary depending on the load on the sintering machine applied to the grate carriage. Therefore, this measured value is suitable for adjusting the conveying speed of the sintering machine only within a certain limited range.

  In a similar sintering machine, U.S. Pat. No. 4,065,295 discloses a method for adjusting the conveying speed based on temperature measurements measured at the collection section of the windbox. The adjustment variable in this adjustment is the temperature of all exhaust gases from all the wind boxes arranged in sequence in the sintering machine. The temperature is measured in a collection line located just before the suction blower. Another adjustment variable is the average temperature deviation of all exhaust gases. These exhaust gases cause the wind box to exceed 100 ° C. This variable shows a faster response than the temperature of the total exhaust gas collected in the collection line.

  This method can also be applied when the temperature maximum cannot be detected in the windbox, or when only the temperature maximum affected locally by an external influence can be detected. Furthermore, it has been proposed to determine a temperature maximum in a continuously arranged wind box corresponding to the current firing completion point as a second adjustment variable in cascaded regulation. The desired firing completion point is determined based on the temperature of the exhaust gas in the collection line. Thus, inaccuracies in determining the maximum temperature should be offset, for example, in the last windbox. However, this adjustment also requires two adjustment variables to be determined and is expensive. Further, the adjustment of the firing completion point can be applied only when the maximum value exists in the temperature distribution. For example, it cannot be applied when the material to be sintered has not been sintered before reaching the material discharge portion.

  U.S. Pat. No. 3,399,053 discloses a method and apparatus for adjusting the conveying speed of a sintering machine. In this method, the temperature is measured in three wind boxes arranged at each of one end and an intermediate part of the conveying path of the sintering machine, whereby the conveying speed is continuously adjusted, and a desired firing completion point is obtained. Adjusted. By applying a parabola from the three temperature measurements at one end of the transport path, the current maximum value in the temperature distribution along the transport path is determined. The current maximum value is compared with the desired position of the maximum value and the firing completion point, and the conveying speed of the sintering machine is changed according to the difference.

  The rate of change of the position of the temperature maximum is predicted from the temperature measurement at the intermediate portion of the conveyance path.

  The conveying speed of the sintering machine is changed according to the current temperature maximum value and the predicted change rate. By considering the predicted rate of change, for example, changes in the sintering characteristics of continuously charged materials can be taken into account quickly. However, this method is sensitive to large uncertainties. This is because individual temperature measurements contain relatively large errors and, in addition to systematic effects, are also influenced by the composition of the sintered cake, which cannot be accurately predicted. In the parabola adaptation based on such an error-containing variable, the adaptation itself is defective, and the maximum value of the temperature distribution may be determined greatly deviating from the actual maximum value. The same applies to the prediction of the rate of change, and the overall control becomes unstable.

  Accordingly, it is an object of the present invention to propose a simple and reliable method and means for adjusting the conveying speed of a sintering machine.

  According to the invention, the object is achieved by a method according to claim 1 and a regulator according to claim 8.

  In the method described above, the temperature profiles of the three measuring points arranged in sequence, in particular just three, are compared. These measurement points may be arranged directly in succession and / or in order with other measurement points in between. In the comparison of the three measurement points, if the temperature values at the first and third measurement points in the transport direction are lower than the temperature value at the second measurement point, the temperature maximum value is estimated. Although the present invention is particularly preferably performed for the evaluation of exactly three measurement points, it can also be evaluated when there are more than three measurement points. In this case, for example, in order for the maximum value to be determinable, the temperature values at the first and last measurement points must be lower than the temperature values at some or all of the measurement points located between them. . According to the present invention, in order to determine the maximum value, a search is made for a changing point where a continuous rise in a series of temperature values changes into a continuous fall. This change point is estimated as the maximum value of the temperature curve.

  However, if the series of temperature values at all measurement points, i.e. all measurement points selected in the relevant evaluation range, rises continuously, the temperature maximum is not estimated. As a result, it is determined that there is no maximum value at three or more measurement points arranged in succession. When the temperature maximum value is estimated after determining whether the maximum value can be estimated, the conveyance speed is adjusted according to the difference between the position of the measurement point of the temperature maximum value and the position of the selected firing completion point. . On the other hand, when the temperature maximum value is not estimated, the conveying speed of the sintering machine is reduced by a specific value.

  In the present invention, the above-mentioned problem of determining the maximum value that the firing completion point of the material to be sintered cannot be determined without any trouble is solved. If the conveying speed of the sintering machine is too high, it often happens that the material to be sintered is ejected from the sintering machine and does not reach the firing completion point before the sintering is completed. With the method for recognizing a firing completion point according to the present invention, not only the temperature maximum value is determined at a plurality of measurement points, but also analysis of the profile of the measurement points to be evaluated that are continuously arranged. Specifically, the determination / analysis is performed by comparing the measurement temperature at a certain measurement point with the measurement temperatures at the measurement points before and after the measurement temperature. The firing completion point is actually determined only when the temperature values at the previous and subsequent measurement points are lower than the temperature of one or more measurement points between the previous and next measurement points. Otherwise, according to the adjusting method of the present invention, when the series of temperature values continuously rises to the last measurement point, the conveying speed of the sintering machine is lowered. Thereby, the temperature maximum value of the material to be sintered is moved into the region of the conveyance path.

  Furthermore, in a preferred embodiment of the adjustment method according to the present invention, when the temperature values at the first, second, and third measurement points continuously decrease, the conveyance speed may be increased by a specific value. This indicates a situation in which the material to be sintered has already reached the firing completion point before reaching the first measurement point. Therefore, also in this case, the maximum value is not estimated.

  As mentioned above, the present invention presents a criterion for recognizing the local maximum in the temperature profile, but according to the present invention, a series of three at a minimum of three, preferably more measurement points. The measured value is searched. In the present invention, when the local maximum value is recognized, the local maximum search may be stopped. Alternatively, the search may continue and the measured values may be checked continuously, for example to find out if there are two local maxima. If there are two maxima, the regulator generates an error message and checks the sintering process, for example with other parameters. When the maximum value is not found according to the above criteria, the search for the maximum value at three consecutively arranged measurement points is continued. Then, from all the measurement points to be evaluated, three measurement points arranged in a series are configured and checked. That is, as already described, instead of evaluating exactly three measurement points, more evaluation points, for example 4 or 5 measurement points, may be evaluated. Therefore, the search for the maximum value is not limited to three measurement points. However, the comparison is always made on three consecutive measurements.

  According to the invention, the measurement points may be arranged directly in sequence along the transport path. In addition, a series of measurement points to be checked can be determined as measurement points to be evaluated. In the transport path, measurement points that are not evaluated may be placed between the measurement points that are sequentially evaluated in the transport direction.

  Compared to the prior art described above, the advantage of the method according to the invention is that the temperature profile along the transport path is evaluated as the only adjustment variable. Thus, a single sensor, that is, one temperature sensor may be provided for each measurement point. This is very advantageous because sensors used in industrial plants, such as sintering plants, need to be robust or otherwise quickly damaged. Providing a plurality of different sensors at each measurement point increases the cost of adjustment.

  In a typical sintering machine, the desired selected firing completion point is preferably located immediately before the end of the conveying path of the sintering machine, so the measurement point is also the end of the conveying path before the material discharge section. For example, it is preferable to arrange in the rear quarter region of the sintering machine.

  In the present invention, it is preferable to provide a larger number of measurement points than three. Thereby, the maximum value in the temperature distribution over most of the conveyance path can be determined. In a normal sintering plant, according to the invention it is particularly preferred to provide 4 to 6 measuring points. Such a number of measuring points generally covers a sufficient length with respect to the conveying path of the sintering machine. Usually, the sintering machine is divided into sections of the same shape. From the viewpoint of construction, it was found that the width of the divided portion is preferably 3 m. Each split part has one window box, and the last four window boxes are split in half to more accurately determine the firing completion point.

  In a preferred embodiment of the method according to the invention, the measuring points are arranged in a windbox, preferably in a windbox arranged directly in sequence. When one measuring point is placed in each wind box of the sintering machine or at least in each wind box in the region of interest, the minimum discriminating distance for the maximum value in the temperature distribution is the window box diameter or extension range in the conveying direction. Correspond. The measurement point is preferably provided in the vicinity of the suction opening of the wind box through which the exhaust gas sucked by the suction blower behind the wind box through the material to be sintered is collected. The temperature of the exhaust gas is directly determined by the temperature of the material to be sintered, and the temperature profile of the exhaust gas specifically follows the temperature of the material to be sintered along the conveying path.

  Instead of evaluating the measurement points arranged in sequence directly, three measurement points may be selected from a plurality of measurement points arranged in sequence. In this case, the first, second, and third measurement points are sequentially arranged in the transport direction, and are arranged between the measurement points that estimate the measurement points that are not estimated. Thereby, different widths of the measurement curve can be taken into account.

  This is particularly recommended when the windbox is divided into a plurality of parts, that is, two or more parts in the transport direction, and one measurement point is arranged in each divided part. In this case, since the conveyance path is scanned at the determination distance given by the divided window box, the measurement can be performed in a state where the determination distance is shorter. The divided portions are logically configured, and a temperature sensor is arranged in each region of the wind box. Separation of the divided parts can be performed, for example, by means of a suitable baffle plate or a funnel at the suction opening. According to the present invention, it is particularly preferable to arrange a plurality of divided parts in the rear third or quarter part of the sintering machine where the selected firing completion point is mainly set.

  In a preferred embodiment, when the temperature maximum value is estimated, the adjustment level at the time of changing the conveyance speed may be based on the difference value between the position of the estimated temperature maximum value and the position of the selected firing completion point. Good. Depending on the difference from the desired firing completion point to the actual firing completion point, adjustment in the direction of the desired or selected firing completion point is facilitated. The adjustment of the change level can be made, for example, via the adjustment parameters of the regulator used, P-regulator, PI-regulator, PID-regulator, or other regulator. Alternatively, a table may be defined for various ranges of the difference, and the adjustment level for changing the conveyance speed may be read from the table.

  If no maximum value is found in the measurement point evaluation, an adjustment level may be set. That is, the conveyance speed may be changed by a certain set value. The purpose of this change is to move the firing completion point onto the sintering machine or to the measurement point area on the sintering machine. Thereby, the maximum value is found. If the local maximum is found, the above-described process of moving the actual firing completion point to the selected firing completion point can be performed.

  In another embodiment of the present invention, the optimum conveying speed may be determined from the plant specific firing rate, the composition of the material to be sintered, the material charging height, and the length of the sintering machine. The length of the sintering machine is preferably the length between the ignition point of the material to be sintered and the selected firing completion point. This logically determined optimum transport speed may be compared and / or considered with the current transport speed when changing the transport speed. A comparison between the optimum transport speed and the current transport speed can be applied to find a transport speed suitable for the process more quickly. Thereby, a conveyance speed is adjusted rapidly. This comparison can also be applied supplementarily or alternatively to optimization of plant specific firing rates if temperature maxima are found. The firing rate is often derived from theoretical considerations for the plant and can be determined by measurements in the current operating state. Further, the firing rate may be used in order to specify the approximate conveyance speed as an initial value in the adjustment. As a result, deviation that may occur during adjustment is suppressed, and a small signal behavior is achieved, thereby enabling quick correction.

  In the present invention, a difference between the actual current conveyance speed and the optimum conveyance speed may be obtained, and a warning message may be generated when the difference exceeds a threshold value. If the maximum value cannot be estimated or found during the measurement point check, the warning message preferably includes a caution instruction to adjust the conveyance speed.

  The present invention also relates to a regulator for adjusting a firing completion point in a sintering machine. The regulator has an arithmetic unit, at least three ports connected to a temperature sensor associated with each measurement point, and an output for specifying a conveyance speed. More temperature sensors are preferably connected to the regulator with the number of measurement points optimally corresponding to the number of ports. In the present invention, the arithmetic unit executes the above-described method or a part of the method, for example, by suitable software.

  In the present invention, the adjuster is combined with the control means of the sintering machine, and designates the conveying speed of the conveying path of the sintering machine. For this purpose, the control means actuates a suitable drive unit of the conveying path, in particular a circulating conveyor belt or a trolley. Specifically, the drive unit operates by an electric motor or hydraulic drive. In the present invention, the output of the adjuster for designating the conveyance speed is connected to the control input of the control unit. If the regulator and controller are implemented in a common microprocessor, the ports described above can be implemented in an integrated computing unit without providing recognizable outputs and control inputs.

  A temperature sensor is connected to all or at least three ports of the regulator, and the temperature sensor is provided in a wind box arranged in order in the conveyance direction along the conveyance path of the sintering machine, and preferably in the suction direction. It is preferable that each temperature sensor constitutes one measurement point.

  If the temperature sensor is arranged in the suction means of the windbox, for example a tapered slot or a funnel-shaped opening, temperature measurements can be made reliably. As a result, the exhaust gas sucked through the material to be sintered is sucked from an accurately determined region that has reached a certain degree of firing.

  In order to further improve the position separation capability in temperature measurement, at least one suction means, and if possible, a plurality or all of the suction means are divided in the transport direction. In this case, a temperature sensor is arranged as a measurement point in each of a plurality of or all divided portions of the suction means.

  Other advantages, features and possible applications of the present invention will be understood from the following description of embodiments and the accompanying drawings. All features described and / or shown herein form the subject matter of the present invention by themselves or in combination, whether or not they are included in the claims or background literature.

FIG. 1 is a schematic view of a regulator according to the present invention connected to a control unit and a measuring point of a sintering machine. FIG. 2 is a schematic diagram showing the steps of the method according to the present invention.

  FIG. 1 is a schematic view of a sintering machine 1. In the sintering machine 1, granular or powdery substances, for example ore, are bonded together by heating. In the material charging unit 2, the material to be heated is charged into a conveyance path 3 formed as a rotating grate, for example. The transport path 3 moves in the transport direction indicated by the arrow F. The material to be sintered first passes under the igniter 4 and the surface of the material to be sintered is ignited.

  The material to be sintered whose surface is ignited while being conveyed along the conveyance path 3 is baked at the bed height, and then discharged from the conveyance path 3 as a sintered body through the material discharge unit 5, for example, to the next step. Supplied. When the material to be sintered is completely fired at the height, the sintering process ends. In this step, a desired firing completion point D is selected. Usually, the firing completion point D is selected so as to be positioned immediately before the end of the transport path 3 and immediately before the discharge unit 5 in the transport direction F.

  In order to promote firing of the material to be sintered, a wind box 6 is provided below the conveyance path 3. The wind box 6 is connected via a suction line 7 to a blower 8 that operates in the suction direction. The windbox 6 has suction means 9 formed as longitudinal slots. The suction means 9 has a maximum opening on the surface facing the conveyance path 3 and sucks exhaust gas generated during firing of the material to be sintered by the negative pressure of the blower 8. Each of the wind boxes 6 is disposed under the transport path 3 with the suction means 9 being close to each other. For clarity, not all the windboxes 6 are shown in FIG. Furthermore, for the sake of clarity, reference numerals are not given to all the windboxes having the suction means 9 shown.

  In the wind box 6 arranged in order in front of the material discharge unit 5 in the transport direction, more accurately, the measuring points 10 are respectively arranged in the suction means 9. For the sake of clarity, all measurement points are not given reference signs.

  Each measurement point 10 is provided with a temperature sensor arranged in the suction means 9 of the wind box 6. The temperature sensor measures the temperature of the exhaust gas sucked from the material to be sintered on the transfer bed in the region arranged on the suction means 9.

  In order to be able to mention each measurement point, each measurement point is denoted by M1 to M5. However, the present invention is not limited to providing five measurement points 10. A person skilled in the art will understand that the number of measurement points can be changed according to the situation of the sintering machine 1. In particular, the second to third quarter of the conveyance path 3 may be covered with an appropriate number of measurement points 10 to detect the firing completion point in this area of the sintering machine 1.

  The measurement points M1 to M5 are connected via respective ports 11 to a regulator 12 in which the method described below is performed. A control unit 13 is provided in the structural unit having the adjuster 12. The control unit 13 has an output 14 for designating the conveyance speed. This output 14 is connected to the drive unit 15 of the transport path 3 and drives the transport path 3 in the transport direction at the transport speed specified by the control unit 13. Each of the adjuster 12 and the control unit 13 has an arithmetic unit, and if possible, a common arithmetic unit, and operates the conveyance path 3 by executing the method described below.

  In the method for adjusting the firing completion point D of the sintering machine 1 according to the present invention, the temperature of the exhaust gas is measured at each of the measurement points M1 to M5. In the typical temperature profile of the exhaust gas in the sintering machine, the temperature value rises until reaching the firing completion point D at the measurement points 10 arranged continuously in the conveying direction. After reaching the firing completion point D, the sintered body is cooled again, and the exhaust gas temperature decreases. Thus, at the firing completion point D, the temperature reaches a maximum value. In the present invention, the temperature profile obtained by the measurement of the measurement points M1 to M5 is analyzed as described below with reference to FIG.

  In the following method, it is assumed that the entire measurement points M1 to Mn arranged continuously are evaluated. For this purpose, the measured temperature values at the measuring points M (i−1), M (i), M (i + 1) are compared with each other. First, it starts from the second measurement point M (i = 2) in the transport direction. In the first scan, it is checked whether the temperature value at the measurement point M (i−1) is smaller than the temperature value at the measurement point M (i). If it is smaller, then the measurement point M (i) and the measurement point M (i + 1) are compared. Here, when the temperature value of the measurement point M (i) is larger than the temperature value of the measurement point M (i + 1), it is recognized that the position i is maximum. In this case, the position of the measurement point M (i) is defined as the current firing completion point D (i), and a difference with respect to the selected firing completion point D is obtained. Depending on the level of this difference, the adjusting speed is adjusted by the adjuster 12 or the control unit 13. This adjustment is performed based on, for example, appropriate parameterization of the adjustment parameter.

  In the first scan, when the temperature value of the measurement point M (i) is equal to or lower than the temperature value of the measurement point M (i−1), the procedure proceeds to the next measurement point M (i + 1) and the last measurement point is reached. The check is repeated until it reaches. If the value M (i) at the last measurement point is smaller than the measurement value M (i-1), the transport speed is increased by a constant K1. This is because it can be seen from the series of measured values that the firing completion point is on the transport path 3 before the first measurement point M1.

  However, in the measurement point check (in the next check step), if the temperature value of the next measurement point M (i + 1) is greater than the temperature value of the measurement point M (i), all measurement points are processed. The procedure proceeds to the next measurement point. Even at the last measurement point, when this condition is satisfied, the series of measured temperature values has increased, and it can be seen that the firing completion point exists behind the conveyance path. In this case, the transport speed is decreased by a constant value K2.

  By adjusting the conveying speed, the control difference D (i) −D does not exist, and the actual firing is completed until the firing completion point D (i) determined at this time coincides with the selected firing completion point D. The point D (i) is shifted in the direction of the selected firing completion point D.

  In the following, this procedure will be described with reference to a specific example for the configuration shown in FIG.

In the first example, the following temperatures are measured at the measurement points M1 to M5.
M1: 240 ° C
M2: 250 ° C
M3: 260 ° C
M4: 270 ° C
M5: 280 ° C

  In this case, since a series of temperatures are rising and each temperature continues to rise from the measured value to the next measured value, the maximum value in the temperature distribution cannot be estimated. In this case, the conveying speed of the sintering machine 1 is too high, and it must be estimated that the firing completion point exists behind the conveying path 3. In this case, the procedure proceeds to the right branch of the method shown in FIG.

In the second example, the following temperature distribution is shown at the measurement points M1 to M5.
M1: 250 ° C
M2: 260 ° C
M3: 270 ° C
M4: 260 ° C
M5: 250 ° C

  In this case, temperatures lower than the measurement point M3 are measured at the measurement points M2 and M4. Therefore, it can be estimated that the current firing completion point D (i) exists at the measurement point M3. For the value i = 3, the procedure proceeds through an intermediate branch in the flowchart of FIG. 2, and after the maximum value of the temperature is determined at the measurement point M3, the measurement point evaluation process stops.

  Further, a difference between the current firing completion point D (i) and the selected firing completion point D is obtained as a control difference. The conveyance speed of the sintering machine 1 is corrected in accordance with the magnitude and sign of this difference constituting the control difference. This means that the correction amount increases as the actual firing completion point D (i) is farther from the selected firing completion point.

  In the second example described above, it is assumed that the selected firing completion point D should be located at the measurement point M4 shown in FIG. However, the current firing completion point D (i) is located at the measurement point M3. Accordingly, the conveyance speed is slightly increased, and the actual firing completion point D (i) is shifted to the position of the measurement point M4.

  This correction will be larger if the actual firing completion point D (i) is located in the region of the measurement point M1.

  If the current firing completion point D (i) is located behind the selected firing completion point D in the transport direction, the transport speed will be correspondingly reduced.

  In connection with the determination of the conveying speed, the conveying speed of the sintering machine may be optimized by determining the firing rate. Depending on the material composition, a specific firing rate is obtained for each sintering machine 1. This firing rate is a rate at which the sintered bed is fired in the vertical direction. If the firing rate is known or determined, the firing is selected from the current material height of the charged material and the length of the sintering machine, specifically the ignition point of the material to be sintered in the transport path From the distance to the completion point, the theoretical optimum transport speed can be calculated according to the following relationship:

  In one example, if the firing rate determined for the plant is 15 mm / min and the charge height is 700 mm, the relative length of the sintering machine from the firing point of the material to be sintered to the selected firing completion point. Therefore, the optimum transport speed is obtained as 4.28 m / min. However, the values used in this example are for illustration only and must be changed depending on the sintering machine, operating mode and material composition.

  This theoretically determined optimum transport speed can be used in determining the transport speed in connection with a given adjustment, such as an adjustment by a regulator. As a result, stable adjustment can be performed, and the actual conveyance speed is adjusted as quickly as possible in accordance with the desired operation mode of the plant performed according to the configuration of the sintering machine and the required amount of the sintered body in the next process. be able to. By taking these parameters into account, the plant operator can first select an appropriate transport speed. At the selected conveying speed, the material to be sintered is conveyed from the material loading part 2 to the material discharging part 5, the surface of the sintering bed is ignited in the ignition part 4, and the ignited layer of the sintering bed is the window. Pulled down by box 6.

  By selecting the firing completion point D, the plant operator determines where the sintering bed should be fired. With the adjustment proposed here, the measured or actual firing completion point D (i) is shifted quickly and accurately to the position of the preselected firing completion point D. Since the current firing completion point D is not located within the region of the measurement points M1 to M5 of the sintering machine 1, the current firing completion point D (i) is reached even when the current firing completion point D (i) cannot be determined. In this case, first, the firing completion point is shifted in the direction of the measurement points M1 to M5 shown in FIG. 1 until accurate adjustment can be performed. This is realized by adjusting the conveyance speed by a fixed set value.

  If the magnitude of the difference between the currently determined firing completion point D (i) and the selected firing completion point D exceeds a certain threshold in connection with the adjustment and to facilitate progress, for example: The optimized transfer speed may be presented to the plant operator.

DESCRIPTION OF SYMBOLS 1 ... Sinter 2 ... Material charging part 3 ... Conveyance path 4 ... Ignition part 5 ... Material discharge | emission part 6 ... Wind box 7 ... Suction line 8 ... Blower 9 ... Suction means 10 ... Measurement point 11 ... Port 12 ... Adjuster 13. Control unit 14 ... Output 15 ... Conveyance path drive unit F ... Conveying direction D ... Firing completion point D (i) ... Estimated firing completion point, measurement temperature maximum position M1-M5 ... Measurement point

Claims (12)

A sintering machine in which a material to be sintered is charged onto the conveyance path (3), ignited, and further conveyed through the window box (6) arranged in the conveyance direction (F) to the material discharge section (5). In which the temperature is measured at at least three measurement points (10) arranged continuously in the conveyance direction (F) along the conveyance path (3), The conveying speed of the sintering machine (1) is adjusted according to the position of the maximum value (D (i)) of the measured temperature with respect to the position of the selected firing completion point (D) on the conveying path, and continuously The temperature profiles of the three measurement points (10) arranged are compared, and the temperature values of the first measurement point and the third measurement point in the transport direction (F) are lower than the temperature values of the second measurement point. If the temperature maximum value is estimated, a temperature maximum value find Unless otherwise specified, the search for local maximum values at three consecutive measurement points (10) continues by further configuring and checking three measurement points arranged in a series from all measurement points to be evaluated. When the series of temperature values at all the measurement points (10) rises continuously, the temperature maximum value is not estimated, and when the temperature maximum value is estimated, the conveyance speed is the temperature maximum value (D When the temperature maximum value is not estimated by adjusting according to the difference between the position of the measurement point in (i)) and the position of the selected firing completion point (D), the transport speed is only a specific value. A method for adjusting a firing completion point, characterized by being reduced.   The method for adjusting a firing completion point according to claim 1, wherein when the series of temperature values at the first, second and third measurement points (10) continuously decrease, the transport speed is a specific value. A method for adjusting a firing completion point, characterized in that the firing completion point is increased by an amount of.   3. A method for adjusting a firing completion point according to claim 1 or 2, characterized in that the measurement point (10) is arranged in the windbox (6).   The method for adjusting a firing completion point according to claim 3, wherein the wind box (6) is divided into a plurality of parts in the transport direction (F), and one measurement point (10) is provided for each of the parts. A method for adjusting a firing completion point, characterized by being arranged.   In the method for adjusting the firing completion point according to any one of claims 1 to 4, when the temperature maximum value is estimated, the change level when the conveyance speed is changed is the temperature maximum value (D ( A method for adjusting a firing completion point, characterized by depending on a value of the difference between the position of i)) and the position of the selected firing completion point (D).   In the method for adjusting the firing completion point according to any one of claims 1 to 5, an optimum conveyance speed is determined from a plant-specific firing rate, a material charging height, and a length of the sintering machine (1). A method for adjusting a firing completion point, characterized in that, when changing the conveyance speed, the current conveyance speed is compared and / or considered.   The method for adjusting a firing completion point according to claim 6, wherein a difference between the current transport speed and the optimum transport speed is obtained, and a warning message is generated when the difference exceeds a threshold value. How to adjust the points.   An adjuster for adjusting a firing completion point in the sintering machine (1), wherein the adjuster includes at least three ports (11) to which an arithmetic unit and a temperature sensor associated with each measurement point (10) are connected. ) And an output for designating a conveyance speed, and the arithmetic unit executes the method according to any one of claims 1 to 7.   9. The adjuster according to claim 8, wherein the adjuster (12) is combined with the control unit (13) of the sintering machine, specifies the transfer speed of the transfer path of the sintering machine, and the transfer speed. The regulator output specifying the regulator is connected to a control input of the controller.   The regulator according to claim 8 or 9, wherein a temperature sensor is connected to the port (11) of the regulator (12), and the temperature sensor is connected to the transport path (3) of the sintering machine (1). ) In the wind box (6) arranged in the transport direction (F) along each of the temperature sensors, and each temperature sensor constitutes one measuring point (10).   11. The regulator according to claim 10, wherein the temperature sensor is arranged in the suction means (9) of the windbox (6). 12. The adjuster according to claim 11, wherein the suction means (9) is divided in the transport direction (F), and temperature sensors are arranged in a plurality of divided portions of the suction means (9). Adjuster.

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