MX2014000808A

MX2014000808A - Method and regulator for adjusting the burn-through point in a sintering machine.

Info

Publication number: MX2014000808A
Application number: MX2014000808A
Authority: MX
Inventors: Karl Semiller
Original assignee: Outotec Oyj
Priority date: 2011-07-28
Filing date: 2012-07-19
Publication date: 2014-07-30
Also published as: SI2737094T1; BR112014001482A2; AU2012288972B2; KR101559687B1; JP5779716B2; EP2737094B1; PL2737094T3; WO2013014063A1; AR087337A1; HUE027693T2; DK2737094T3; AP2014007440A0; ZA201309255B; EP2737094A1; CN103717763A; ES2563178T3; UA108804C2; AU2012288972A1; JP2014523971A; CN103717763B

Abstract

For adjusting the burn-through point (D) in a sintering machine (1), in which the material to be sintered is charged onto a conveying path (3), ignited and transported past windboxes (6) arranged in conveying direction (F) up to a material dump (5), the temperature is measured at at least three measurement points (10) consecutively arranged along the conveying path (3) and the conveying speed of the sintering machine (1) is adjusted in dependence on the position of the maximum measured temperature (D(i)) relative to the position of the selected burn-through point (D) on the conveying path. The profile of the temperature of three consecutively arranged measurement points (10) is compared, wherein a maximum of the temperature is assumed when the first and third measurement points (10) in conveying direction (F) have a lower temperature value than the second measurement point (10), and wherein no maximum of the temperature is assumed when all measurement points (10) form an ascending series of temperature values. With an assumed maximum of the temperature, the conveying speed is adjusted in dependence on a deviation between the position of the measurement point with the maximum temperature value (D(i)) and the position of the selected burn-through point (D), whereas with no assumed maximum of the temperature the conveying speed is reduced by a specified value.

Description

METHOD AND REGULATOR TO ADJUST THE PERFORATION POINT BY BURN IN A MACHINE SINTERIZATION Field of the Invention This invention relates to a method and a regulator for adjusting the point of perforation by burning in a sintering machine. In the sintering machine, the material to be sintered, which for example contains ores, is loaded in a transport passage, for example a moving grid or grid car, which is then started and disposed of the arranged distribution conduits. in the direction of transport and that is operated in the suction direction with transport to a material discharge. During transport in the sintering machine, the material to be sintered is burned to form a sintering mass and at the end of the sintering machine is discharged close to the material discharge, for example by sweeping, and is supplied to the processes Subsequent In the method for adjusting the burn point, the temperature determined by the temperature of the material to be sintered is measured in at least three measuring points arranged one after the other along the transport passage, and the transport speed of the the sintering machine is adjusted according to the position of a maximum measured temperature in relation to the position of a previously selected burnt perforation point in the transport path or path.

Background of the Invention During sintering, mostly granular or powdered substances are connected to each other by heating. The heating is carried out by igniting the surface of the material in a sintering machine after the entry of material. The ignited material is then transported in the sintering machine, where the ignited or combustion material on the surface completely perforates the height of the material to be sintered. At the burn point, where the entire bed has been drilled in the vertical direction, the temperature measured near the wind distribution duct is at maximum. Subsequently, the sintered material is cooled during the subsequent transport in the sintering machine.

In general, it is desired that the sintering be completed at the end of the sintering machine or just before the end of the sintering machine. In any case, however, it should be avoided that the sintering process is not complete when the material is discharged and the sintering process is carried out in the subsequent cooling stations, which can be damaged by the heat generated during the sintering. In addition, it should be avoided to reach the point of drilling by burning too early in the machine, and this would lead to lower production.

In order to avoid the above, the regulations on the point of burnt drilling take into account the temperatures in the distribution ducts, in particular in the last third of the sintering machines, in order to determine the burning point. In the process, the maximum temperature value is determined from the measured temperatures and the burn point is determined from it. By means of a comparison, it is determined in which of the distribution conduits there is the value of maximum temperature. This position is compared to the preselected position for the desired burn point.

If the wind distribution duct with the measured maximum temperature value is located before the selected position of the desired burn point, the transportation speed of the sintering machine is increased by a firmly defined factor. If the wind distribution duct with the maximum measured temperature value is located after the selected position for the drilling point, the speed of the machine is reduced by the same firmly defined factor.

US Patent 3.21 1,441 discloses a method and apparatus for regulating the transport speed of a sintering machine. To this end, the temperature and pressure of the residual air are measured in one of the plurality of wind distribution ducts arranged consecutively of a Dwight Lloyd sintering machine and it is checked whether these measured values are within the desired range. This indicates that the sintering process will be completed within the desired time or in the desired position of the sintering machine. In a sintering process, the profile of the temperatures measured in distribution conduits shows a maximum at the point of perforation by burning of the sintering bed. The pressure measured in the residual gases sucked through the sintering bed remains approximately constant until reaching the point of drilling and falls sharply after reaching the point of drilling by burning. By an appropriate combination of value ranges for the temperature and residual air pressure, which are suitably selected for the sintering machine and the process being carried out, it can be decided in a selected wind distribution duct whether the process in the duct The selected wind distribution of the sintering machine is located near the burnt point. Depending on the constellation of the two measured values, the conveying speed of the sintering machine will increase or decrease in order to move the burn point within the region of the selected wind distribution conduit.

This regulation, however, is comparatively expensive, because two different measured values must be considered, in order to be able to reliably determine the burning point. In addition, fluctuations of the absolute values of the measured pressure may occur, for example, depending on the load of the sintering machine on the rack or grid cart. Therefore, this measured value is suitable for a regulation of the transport speed of the sintering machine only to a limited extent.

In a comparable sintering machine, US Pat. No. 4,065,295 describes a method for regulating the transport speed at the base of a measurement of the temperature measured in collectors of the wind distribution pipes. A regulatory variable of the regulation is the temperature of all the waste gases from all the wind distribution pipes arranged one after the other in the sintering machine, which is measured in a collection line just before the suction blower. As another regulation variable, the deviation of the average temperature of all the waste gases, which leave the wind distribution pipes with a temperature of more than 100 ° C, is used. This variable reacts faster than the total temperature of the waste gases collected in the collection line. This method can also be used when maximum temperature can not be detected or only a maximum temperature locally adulterated by external influences in the wind distribution ducts is detected. Alternatively, the determination of the maximum temperature in the wind distribution pipes arranged consecutively is proposed as a second regulation variable in a cascade regulation, which corresponds to the point of perforation by current burning. The desired burn point is determined on the basis of the temperature of the waste gases in the collection line. In this way, inaccuracies in the determination of the maximum temperature should be compensated, for example in the last wind distribution conduit. This regulation, however, is also costly, because two regulatory variables must be determined. In addition, the adjustment to adjust a burn point can only be used when a maximum in the temperature distribution can also be found. For example, this is not the case when the material to be sintered is not even sintered until the material is discharged.

US 3,399,053 discloses a method and apparatus for regulating the transport speed of a sintering machine, wherein in three wind distribution conduits each disposed at the end of the transport passage and in the middle of the passage of transport of the sintering machine, the temperatures are measured, so as to regulate continuously the transport speed and adjust the point of drilling by burning desired. From the three temperature measurements at the end of the transport passage, the maximum intensity of temperature distribution along the transport passage is determined by adaptation of a parabola. This maximum intensity is compared with the desired position of the maximum and the burning point, respectively, where a change in the transport speed of the sintering machine derives from a deviation.

From the temperature measurements in the middle of the transport passage, a prediction of the change rate of the position of the maximum temperature is derived.

The transport speed of the sintering machine is then adapted depending on the maximum temperature distribution and the expected change rate. By taking into account the expected rate of change, changes in the sintering characteristics, for example, of material subsequently introduced, can be considered quickly. However, this method is subject to great uncertainty, because the individual temperature measurements each include large errors comparatively, which in addition to possible systematic influences are also accidentally influenced by the imprecisely estimated composition of the sintering mass. An adaptation of a parabola in the base of these defective variables can lead to the fact that the adaptation itself is also defective and the maximum of Temperature distribution is determined with a considerable distance from the current maximum. The same applies to the prediction of the exchange rate, so that the whole of an unstable regulation is obtained.

Therefore, it is an object of intention to propose a simple and strong possibility of regulating the transport speed of a sintering machine.

According to the invention, this object is solved with a method according to claim 1 and with a regulator according to claim 8.

In the method mentioned above, therefore, the temperature profile of three, in particular exactly three, measuring points arranged consecutively is compared. These measuring points can possibly be arranged directly one after the other and / or one after the other separated by other measuring points. In the comparison of the three measurement points, a maximum of the temperature is calculated when the first and third measurement points in the transport direction have a lower temperature value than the second measurement point. Even though the invention in a particularly advantageous manner is carried out with the evaluation of exactly three measuring points, it is also possible to evaluate more than three measurement points, where in this case, for example, the first and the last measurement points. they must have a lower temperature value than some or all of the average measurement points between them, in order to be able to determine a maximum. To determine a maximum, the point of change in a sequence of measurement points is sought in a particularly advantageous manner according to the invention, wherein a sequence of increasing temperature values changes in a sequence of decreasing temperature values. This change point is then calculated as the maximum of the temperature curve.

According to the invention, however, maximum temperature is not calculated when all the measuring points, in particular all the measuring points selected in a relevant evaluation range, form an ascending series of temperature values, so that in particular in three or more measuring points arranged consecutively, no maximum is found. After the determination as to whether a maximum can be presumed or not, the transport speed is set with a maximum temperature estimate depending on a deviation of the positions of the measuring point with the maximum temperature value and the position of the selected burn point, while when maximum temperature is not calculated, the transport speed of the sintering machine is reduced by a specified value.

This also solves the problem of the previous maximum consideration, which could not safely be determined if the burning point of the material to be sintered is still in the sintering machine. It is very likely that due to a very high transport speed in the sintering machine, the point of burning by burning had not yet been reached when the material to be sintered was already discharged from the sintering machine before being fully sintered . Because the bursting point recognition method proposed in the invention now not only considers the maximum temperature value of the various measuring points, but also an analysis of the profile of the measuring points arranged in consecutively to be evaluated, in particular, by a comparison of the measured temperature of a measurement point with the preceding and subsequent measurement point. Only when the temperature values of both the preceding and subsequent measurement points are lower than the temperature of the average measuring point or of several average measuring points, it is ensured that the burn point has actually been determined. If this is not the case, the regulation according to the invention proposes to reduce the transport speed of the sintering machine when there is a sequence of temperature values increasing up to the last measurement point, in order to bring the maximum of the temperature of the material to be sintered within the region of the transport passage.

In an advantageous supplementation of the regulation method according to the invention, the transport speed can also be increased by a specified value when the first, second and third measurement points form a descending series of temperature values. This indicates that the material to be sintered has already reached its bursting point before reaching the first measurement point. So a maximum is not calculated in this case either.

In the at least three, although preferably more measuring points of temperature values, a sequence of three values measured according to the invention is sought, which reveal the criteria described above to recognize a maximum in the temperature profile. If said maximum has been recognized, the maximum search may be stopped according to the invention. Alternatively, however, it is also possible to continue the search and in this way carry out a verification of the measured values, in order to discover, for example, whether two maxima are recognized. If this were the case, an error message of the regulation could be issued, so that the sintering process is verified, for example by means of other parameters. However, as long as a maximum is not found using the previous criterion, the search for maxima continues at three measuring points arranged consecutively, so that each of all the measurement points are formed and verified to be sequences evaluated of three measuring points to be evaluated one after the other, and, instead of the three measurement points to be evaluated one after the other, more measurement points, for example, four or five, can be evaluated, as described above . Thus, the maximum search is not limited to three measurement points, but there are always three successive measurements compared.

According to the invention, the measurement points can be measurement points arranged directly one after the other along the transport passage. According to the invention, however, it is also possible that the measurement points to be evaluated are defined by fixed verification sequences of measurement points. It is also possible that the measuring points not to be evaluated are located between the measurement points arranged consecutively to be evaluated in the transport direction.

As purchased with the prior art described above, an essential advantage of the proposed method also consists in that the temperature profile along the transport step is evaluated as the only regulation variable according to the invention. This allows to provide a single sensor, such as a temperature sensor, per measurement point. This is particularly advantageous, because the sensors used in technical plants such as a sintering plant must be resistant, since otherwise they can be damaged rapidly. A plurality of different sensors per measuring point therefore considerably increases the costs of the regulation according to the invention.

As in conventional sintering machines, the desired and preferably selected burn point is just before the end of the transport passage in the sintering machine, and the measurement points are preferably also disposed at the end of the transport passage before material discharge, for example, in the last third of the sintering machine.

Preferably, more than three measuring points are also provided according to the invention, in order to be able to determine the maximum of a temperature distribution over a large part of the transport passage. In conventional sintering plants, a number of four to six measuring points is particularly preferred according to the invention, which generally covers a sufficient length of the transport passage in the sintering machine. Normally, the sintering machine is divided into uniform sections. In terms of construction, it was found advantageous at a segment width of 3 m. Each of these segments has a wind distribution duct, where the last four wind distribution ducts are cut in half to provide a more accurate definition of the burn point.

In a preferred embodiment of the method according to the invention, the measurement points can be arranged in the wind distribution conduits, preferably in wind distribution conduits arranged directly one after the other. The maximum local resolution of the temperature distribution then corresponds to the diameter or extent of a wind distribution duct in the direction of transport, when in each wind distribution duct of the sintering machine or at least in each distribution duct of wind of the sintering machine from the region of interest, a measuring point is arranged. The measuring points are preferably located near the suction openings behind the wind distribution ducts, where the waste gases sucked by the suction blower are collected behind the wind distribution ducts through the material to be sintered . The temperature of the waste gases is determined directly and decisively by the temperature of the material to be sintered, where the temperature profile of these waste gases in particular follows the temperatures in the material to be sintered along the transport step .

Instead of an evaluation of the measurement points arranged directly next to one another, three measurement points can also be selected from a plurality of measurement points arranged consecutively, where the points of measurement First, second and third measurement are arranged one after the other in the transport direction, but measurement points not considered are disposed between the measurement points. In this way, a different amplitude of the measurement curve can be taken into account.

This is recommended in particular when a wind distribution duct is divided into several, that is, two or more, segments in the transport direction and in each segment a measurement point is arranged. In this case, the measurement can be carried out with a generally better resolution, because the transport step can be scanned with the resolution resolution supplied in the wind distribution conduits. The segments can be organized logically, since different temperature sensors are arranged in different regions of the wind distribution duct. Possibly, a constructive separation of the segments can also be carried out, for example, by means of baffle plates in the openings or suction channels. According to the invention, it is particularly advantageous to arrange the plurality of segments, in particular, in the last third of the sintering machine, where the selected bursting point is mostly located.q.

According to a particularly preferred embodiment, the adaptation height when changing the transport speed in the case of an estimated maximum temperature may depend on the value of the deviation between the position of the estimated maximum temperature and the position of the point of perforation by selected burn. Depending on the deviation of the drilling point by actual burning with the desired one, an adjustment in the direction of the drilling point by desired or selected burn is thus accelerated. Adjustment of the adaptation height, for example, can be done via the regulation parameters of the regulator used, a regulator P-, PI-, PID or another regulator. Alternatively, a table of values can also be specified for various value ranges of the deviation, from which the height of the adaptation of the change in transport speed will be read.

For the case that a maximum is not found in the evaluation of the measurement points, the height of the adaptation can be fixed, that is, a change in the transport speed can be made by a fixed value. The objective of this change is to change the point of drilling by burning in the sintering machine or within the region of the measuring points in the sintering machine, so that a maximum is then found. As soon as the maximum is found, the above-described process of changing the drilling point by current burning at the selected burned-out drilling point can be carried out.

According to a preferred variant of the proposed method, an optimized transport speed can be determined from a plant-specific burn rate, the composition of the material to be sintered, the material loading height and the length of the sintering machine. , preferably the length of the sintering machine between the ignition point of the material to be sintered and the selected burn point. This theoretically determined, optimized transport speed can be compared with the current transport speed and / or taken into account when changing the transport speed. The comparison of the optimized transport speed and the current transport speed can be used to find the transport speed suitable for the process more quickly, so as to quickly find the transport speed to be adjusted. In addition, the proposed comparison may additionally or alternatively be used for a specific plant optimization of the burning or drilling rate, when a maximum of the temperature is found. The burn rate mostly results from the theoretical considerations related to the plant, which in the current operation can be specified by the measured values. In addition, the burn-in or perforation rate can be used to specify an approximate transport speed as the starting value of the regulation, in order to minimize the possible regulation deviations and generate a small signal behavior of the regulation, which provides a correction in particular fast According to a development of this feature of the invention, a difference can also be formed between the current transport speed and the optimum transport speed, with a warning message when a threshold value is exceeded. The warning message may possibly also contain a reference to the transport speed to be adjusted favorably, in particular when it can not estimate or find a maximum when checking the measurement points.

According to the invention, the present invention also relates to a regulator for adjusting the point of perforation by burning in a sintering machine. This regulator includes a calculation unit and at least three ports for connecting temperature sensors associated with individual measurement points and an output for specifying a transport speed. Preferably, however, more temperature sensors can be connected to the regulator, where the number of measurement points optimally corresponds to the number of ports. According to the invention, the calculation unit is adapted to carry out the above-described method or parts thereof, for example, by means of suitable software.

A development of the regulator according to the ition provides that the regulator is integrated into a control means of the sintering machine, which specifies the transport speed of the transport passage of the sintering machine. For this purpose, the control can drive suitable drive units of the transport passage, in particular of a transport belt or carriage possibly in circulation. The drive units in particular can be driven by an electric or hydraulic motor. According to the ition, it is provided that the regulator output to specify the transport speed is connected to a control input of the controller. This port can also be realized in an integrated calculation unit without recognizable outputs and control inputs, when regulation and control are implemented in a common microprocessor.

Preferably, the temperature sensors can be connected to some ports, but at least to three ports of the regulator, which in the transport direction are arranged on the wind distribution conduits arranged consecutively along the transport passage of the sintering machine, preferably in wind distribution conduits driven in the direction of suction, and where each forms a measuring point.

A particular reliable temperature measurement can be carried out when the temperature sensors are arranged in the suction means of the wind distribution channels, for example, in tapered grooves or funnel-shaped openings. As a result, residual gases sucked through the material to be sintered are they suck from an exactly defined region where a certain degree of burning of the material to be sintered has been achieved.

To further increase the resolution of the temperature measurement, at least one suction means, although possibly also several or all of the suction means, can be formed segmented in transport direction, where in carios or in all segments of the medium suction a temperature sensor is arranged each as a measuring point.

Other advantages, features and possible applications of the present ition can also be taken from the following description of an exemplary embodiment and the drawings. All the described and / or illustrated features form the object of the present ition per se or in any combination, also independently of their inclusion in the claims or their background.

Brief Description of the Drawings In the drawings: Figure 1 shows schematically a regulator connected to the control of a sintering machine and connected with measuring points according to the ition.

Figure 2 schematically shows the procedure of a method provided according to the ition.

Detailed Description of Preferred Modalities of the Ition Figure 1 schematically shows a sintering machine 1 in which granular or powdered substances, for example ores, are connected to each other by heat. In a discharge of material 2, the material to be heated is therefore loaded in a transport passage 3 formed for example as a circulating grid. The transport passage 3 moves in the direction of transport designated by the arrow F. The material to be sintered is first passed through the lower part of a starter 4 that ignites the material to be sintered on its surface.

During transport along the transport passage 3, the material to be sintered superficially on fire burns through the top of its bed, before it is discharged as sintering material from the transport passage 2 through the discharge of material 5, in order to be supplied for example to a subsequent process. As soon as the material to be sintered has burned to the top of it, the sintering process is complete. The burn point D is selected in the process. Usually, the burn point D is located just before the end of the transport passage 3 and the material discharge 5 in the direction F.

To promote the perforation by burning of the material to be sintered, the wind distribution conduits 6 are provided below the transport passage 3, which via a suction line 7 are connected to a blower 8 operated in the suction direction. The wind distribution ducts 6 include suction means 9 formed as longitudinal grooves, which have their largest opening on the side facing the transport passage 3, in order to suck the waste gases generated during the perforation by burning the material to being sintered as a result of the negative pressure generated by the blower 8. The wind distribution ducts 6 are each disposed below the transport passage 3 with its suction means 9 adjacent to each other, where for the purposes of greater clarity , not all wind distribution ducts 6 are shown in Fig. 1. In addition, not all wind distribution ducts illustrated with their suction means are provided with reference numbers for clarity.

In the wind distribution ducts which in the direction of transfer are arranged directly side by side before the material discharge 5, or more precisely in their suction means 9, each of the measuring points 10 is arranged, although not all of them are provided with reference numbers for greater clarity.

The measuring points 10 each include a temperature sensor disposed in the suction means 9 of a wind distribution conduit 6, wherein said sensor measures the temperature of the residual gases sucked from the material to be sintered into the bed of transport in the region disposed above the suction means 9.

In order to be able to refer to the various measuring points below, they are designed as measuring points MI to M5. However, it is expressly pointed out that the invention is not limited to providing exactly five measuring points 10. On the other hand, one skilled in the art can adapt its number to the respective circumstances of the sintering machine 1, where, in particular, the last third of the step of transport 3 is covered with the appropriate measuring points 10, in order to be able to detect the burnt perforation point in this region of the sintering machine 1.

By means of each of the ports 1 1 supplied, the measurement points MI to M5 are connected to a regulator 12 where the method described below takes place. In a construction unit with the regulator 12, a controller 13 is provided which includes an output 14 for specifying a transport speed. This outlet 14 is connected to a drive unit 15 of the transport passage 3, in order to move the transport passage 3 in the transport direction 12 with the transport speed specified by the controller 13. The regulator 12 and the controller 13 each includes calculation units, possibly also a common calculation unit, which is adapted to carry out the method described below and to drive transport step 3.

The method proposed according to the invention for adjusting the burn point D of the sintering machine 1 provides that the temperatures of the waste gases are each measured at the measurement points MI to M5. A typical temperature profile of these waste gases in the sintering machine provides that at measurement points 10 which follow one another in the transport direction, the temperature values rise, until the burn point is reached. D. After reaching the burn point D, the sintered material is cooled again, so that the temperature of the waste gases decreases. The maximum temperature is thus reached at point D of perforation by burning. According to the invention, the temperature profile measured at the measurement points MI to M5 is now analyzed as will be explained below reference to Figure 2.

It is assumed that in the method a total of measurement points arranged consecutively MI to Mn are evaluated. For this purpose, the measured temperature values of the measurement points M (i-l), M (i) and M (i + 1) are each compared to the other. We start with the second measurement point M (i = 2) in transport direction and in a first scan we check if the temperature value of the measurement point M (i = l) is smaller than the temperature value of the measurement point M (i) If this is the case, the next check is a comparison between the measurement points M8i) and M (i + 1), where a maximum is indicated at position i, when the temperature value at point M (i) is greater than temperature value at the measuring point M (i * l). In this case, the position of the measuring point M (i) is defined as the current bursting point D (i) and the difference is formed with the burn point D selected. Depending on the height of this regulation difference, the transport speed is adapted in the controller 12 or controller 13, where adaptation, for example, is carried out on the basis of a parameterization of the regulation parameters.

When it is indicated on the first scan that the temperature value of the measuring point M8i) is not greater than the temperature value of the measuring point M (il), the procedure goes to the next measuring point M (i + 1) and the test is repeated until the last measuring point is reached. If also for the last measurement point, the value M (i) is smaller than the measured value M (il), the transport speed is increased by a constant l, because the sequence of measured values indicates that the point of Burning perforation is in transport passage 3 before the first measurement point MI.

However, if when verifying a measurement point (in the next verification step) it is indicated that the subsequent measurement point M (i + l) also has a temperature value higher than the measurement point M8i), the procedure also goes to the next measurement point, until all the measurement points are processed. If this condition is also fulfilled at the last measurement point, there is an ascending series of measured temperature values, which indicates that the burn point is behind the transport step. In this case, the transport speed is reduced by a constant value K2.

When adapting the transport speed, the current burn point D (i) is changed in the direction of the selected burn point D, until there is no further control deviation D (i) -D and the drilling point by burning D (i) fixed corresponds to the point of perforation by burning D selected.

This procedure will be explained again below with reference to a specific example with respect to the arrangement shown in Fig. 1 In a first considered case, the following temperatures are measured at the measurement points MI to M5: MI: 240 ° C M2: 250 ° C M3: 260 ° C M4: 270 ° C M5: 280 ° C In this case, there is an ascending temperature sequence and a maximum temperature distribution can not be assumed, because each of the temperatures continues to increase from measurement point to measurement point. In this case, it must be assumed that the conveying speed of the sintering machine 1 is too high and the burn point is located behind the transport passage 3. In this case, the procedure is carried out on the right side of the method as shown in Fig. 2.

In a second case, the following temperature distribution is presented at the measurement points M to M5: MI: 250 ° C M2: 260 ° C M3: 270 ° C M4: 260 ° C M5: 250 ° C In this case, a lower temperature is measured at the measuring points M2 and M4 with respect to the measuring point M3. It can be assumed, therefore, that the current bursting point D (i) is located at the measuring point M3. For the value i = 3, the middle part of the flow diagram of Fig. 2 is developed, and after determining the maximum value of the temperature at the measuring point M3, the evaluation process of the measuring points stops .

In contrast, the difference between the current burn point D (i) and the selected burn point D is formed as a control deviation. Depending on the amount and sign of this difference forming the control deviation, it is now performed a correction of the conveying speed of the sintering machine 1. This means that the correction is greater when the current bursting point D (i) is farthest away from the drilling point selected by burning.

In the case 2 described above, the selected burn point D should be at the measurement point M4, as shown in Fig. 1. The current burn point D (i), however , is located at the measuring point M3, so that the transport speed is barely increased, in order to change the burn point D (i) to the position of the measuring point M4.

If the burn point D (i) is in the region of the measurement point MI, this correction would be greater.

If the burn point D (d) is behind the burn point D selected in the transport direction, the transport speed would be correspondingly reduced.

With regard to the determination of the transport speed, the transport speed of the sintering machine can also be optimized when determining the speed of perforation by burning. Depending on the composition of the material, a specific bursting speed is obtained for each sintering machine 1, with which the sintering bed burns in the vertical direction. If this bursting speed is known or determined, a theoretically optimum transport speed can be calculated from the current material height of the loaded material and the length of the sintering machine or in particular the distance between the ignition point of the material to be sintered in the transport step and the burnt point by selected burn, with reference to the following relationship: transport speed _ length optimal (bed height Y drill handle by burned When in an example the bursting rate or speed determined for the plant is 15mm / min and the height of the loaded material is 700mm, the optimum transport speed of 4.28m / min is obtained with a relevant length of the Sintering machine from the ignition of the material to be sintered to the point of perforation by selected burn. However, the values used in the example only serve as an explanation and they must be adapted to the sintering machine, the mode of operation and the composition of the material.

The theoretically determined optimal transport speed can be used when determining the transport speed in relation to the regulation provided, for example, by the regulator, in order to create a stable regulation and adapt the current transport speed as fast as possible up to the desired mode of operation of the plant, which depends on the construction of the sintering machine and the sintering demand for the subsequent process. Taking these parameters into account, the plant operator can initially select an appropriate transport speed. With the suitable transport speed, the material to be sintered is transported from the material inlet 2 to the material discharge 5, where the surface of the sintering bed is turned on once the actuator 4 and the lit layer of the bed of sintered are carried through the wind distribution pipes 6.

By selecting the burn point D, the plant operator determines in which position the sintering bed should be completely perforated by burning. Due to the proposed regulation, a fast and accurate change is now made to the measured and current burn point D (i) to the preselected position of the burn point D, whose position is also reached when a burn point can not be determined D (i), because the burn point D is not located in the region of the measuring points MI to M5 of the sintering machine 1. In this case, the burn point is initially changed in the direction from the measurement points MI to M5 as shown in Fig. 1, until the exact regulation has effect. This is achieved by adapting the transport speed through firmly specified values.

In relation to the regulation and to accelerate the passage, the optimized transport speed for example, can also be proposed to the plant operator when the quantity of a different one from the point of drilling by burning D (i) currently determined and the point of burned perforation D selected exceeds a particular threshold value.

Claims

1. A method for adjusting the point of drilling by burning in a sintering machine, wherein the material to be sintered is loaded in a transport passage, ignited and transported through the conduits or boxes arranged in the transport direction to a discharge of material, where in at least three measuring points arranged consecutively in transport direction along the transport passage, the temperature is measured and the conveying speed of the sintering machine is adjusted depending on the position of the measured temperature maximum in relation to the position of the burn point selected in the transport step, wherein said method is characterized by comparing the temperature profile of three measurement points arranged consecutively, and where a maximum of the temperature when all the measurement points form an ascending series of temperature values, and why e with an estimated maximum temperature the transport speed is adjusted depending on a deviation between the position of the measuring point with the maximum temperature value and the position of the drilling point per selected burn and because without maximum estimated temperature the speed transport is reduced by a specified value.

2. The method according to claim 1, characterized in that the transport speed is increased by a specified value when the first, second and third measurement points form a descending series of temperature values.

3. The method according to claim 1 or 2, characterized in that the measuring points are arranged in wind distribution conduits.

4. The method according to claim 3, characterized in that a wind distribution conduit is divided into several segments in the transport direction and in each segment a measurement point is arranged.

5. The method according to any of the preceding claims, characterized in that the height of the adaptation when changing the transport speed in the case where a maximum of the temperature is calculated depends on the value of the deviation between the position of the maximum of the temperature and the position of the drilling point by burning.

6. The method according to any of the preceding claims, characterized in that an optimized transport speed is determined from a specific plant burn rate, the material loading height and the length of the sintering machine. compares with the current transport speed and / or is taken into account when changing the transport speed.

7. The method according to claim 6, characterized in that a difference between the transport speed and the optimum transport speed is formed and a warning message is issued when a threshold value is exceeded.

8. A regulator for adjusting the burn point in a sintering machine with a calculation unit and at least three ports for connecting temperature sensors associated with individual measurement points and an output for specifying a transport speed, characterized in that the The calculation unit is adapted to carry out the method according to any of claims 1 to 7.

9. The regulator according to claim 8, characterized in that the regulator is integrated with a controller of the sintering machine, which specifies the transport speed of the transport passage of the sintering machine and because the output of the regulation to specify the speed transport is connected to a control output of the controller.

10. The regulator according to claim 8 or 9, characterized in that the regulator ports of the temperature sensors are connected, and are arranged in wind distribution conduits in transport direction along the transport passage of the sintering machine and each one forms a measurement point.

11. The regulator according to claim 10, characterized in that the temperature sensors are arranged in suction means of the wind distribution conduits.

12. The regulator according to claim 10, characterized in that a suction means is segmented in transport direction and that a temperature sensor is disposed in several segments of the suction means.