KR20050069301A - Speed controller of iron ore sintering machine and method thereof - Google Patents

Abstract

The present invention is a speed control device and method for iron ore sintering machine to secure the stability of the control and improve the speed control efficiency by using the plasticity singularity which is important information representing the state of the sintering machine when controlling the bogie speed of the iron ore sintering machine It is about.

The present invention provides a plurality of temperature measuring means for measuring the temperature of the exhaust gas discharged from the sintering machine trolley is installed at regular intervals for each wind phase of the sintering machine; The temperature of the wind phase measured by the plurality of temperature measuring means checks the position of the wind phase reaches a specific temperature set according to the sintering completion temperature of the photographic ore and the position at which the temperature is measured and the distance between the sintering machine bogie and input to the position controller And a control unit configured to control the speed, wherein the control unit interpolates linearly on the basis of the average temperature of the wind speed below the specific temperature and the continuous temperature of the excess continuous wind phase to identify the position of the wind phase that has reached the specific temperature. Alternatively, the position of the wind phase at which the specific temperature is reached may be interpolated based on the average temperature of the wind phase below the specific temperature and the excess continuous wind image.

Description

Speed controller of iron ore sintering machine and method thereof {Speed Controller of Iron Ore Sintering Machine and Method Thereof}

The present invention relates to a speed control device and method of the iron ore sintering machine, and more particularly, to control the stability of the iron ore sintering machine by using the plasticity singularity which is important information representing the state of the sintering machine when controlling the bogie speed of the iron ore sintering machine. And a speed control device and method for iron ore sintering machine for improving the speed control efficiency.

In general, in the sinter plant, a sintering raw material is prepared by mixing fine iron ore with subsidiary materials such as limestone and fine powder coke used as a fuel and supplying the sintering machine to the sinter truck.

Then, the surface of the sintered raw material charged into the sintering machine trolley is ignited with an ignition burner, and the sintering reaction proceeds by burning coke contained in the sintered raw material by air sucked through the lower part of the wind by the suction blower. A sintered cake in the form of a mass is produced.

The sintered cake is dropped into the crusher and broken by the rotation of the sintering machine. The sintered cake is cooled by the cooler and sorted into a sintered ore having a specific particle diameter and supplied to the blast furnace.

At this time, by measuring the temperature of the exhaust gas discharged to the various wind phases located below the sintering machine, and numerically calculating the maximum temperature, the position of the exhaust gas maximum temperature is defined as the burn-through point (BTP). And controlling to maintain the position at a specific position is the most common BTP sintering machine speed control model.

Here, the peak of exhaust gas temperature is the position where coke combustion is completed, and in the subsequent sintering machine, the model is based on the cooling of the calcined sintered cake, and is mainly applied when the capacity of the sintering machine is sufficient compared to the capacity of the blast furnace in the past. Has been.

However, in recent years, it is a general trend that the maximum productivity is operated due to the lack of sintered ore production, and the speed control model of the past has greatly reduced the utility.

In high-production sintering operations, it is often impossible to estimate the peak of the exhaust gas temperature.In this case, the sintering speed control using the BTP model eliminates a specific point of control (set-point position). This shows a big problem that the driver must operate manually.

That is, the calculation of the BTP point, as shown in Fig. 2, by using the exhaust gas temperature measured in the longitudinal direction of three or more points to calculate the curve by virtually curve fitting (curve fitting) the secondary convex curve upwards, The position where the derivative value becomes "0" is obtained by BTP.

In daily operation, the highest temperature point is located inside the three measurements used in the calculations, making it suitable for secondary curves.However, when operating for the purpose of increasing the productivity of sintered ore, the three consecutive exhaust gases used in the calculations are used. There is a problem that the temperature measurement may show a tendency to continue to rise, such that the stability is poor.

Recently, due to these problems, instead of using the firing completion point (BTP), which is the exhaust gas temperature peak, as the positional information for sintering machine speed control, as shown in FIG. Although the inflection point is defined as the plastic inflection point (BRP) and the BRP speed control model is applied to the sintering machine position control information, this method has proposed a complexity of the model that is difficult to apply to a general control system. There was a problem involving it.

Accordingly, the present invention has been made in view of the problems of conventional firing completion point and plastic inflection point control, the object of the present invention is to determine the position of the wind phase after confirming the position of the wind phase reached the sintering completion temperature through the thermoelectric element The present invention provides an apparatus and method for controlling the speed of an iron ore sintering machine to adjust the speed of the sintering machine by the position controller.

In order to achieve the above object, the present invention is a speed control device of the sintering machine for controlling the bogie speed of the iron ore sintering machine through a position controller, the discharge is installed in the sintering machine trolley at regular intervals for each wind phase A plurality of temperature measuring means for measuring the temperature of the gas; The temperature of the wind phase measured by the plurality of temperature measuring means checks the position of the wind phase reaches a specific temperature set according to the sintering completion temperature of the photographic ore and the position at which the temperature is measured and the distance between the sintering machine bogie and input to the position controller And a control unit configured to control the speed, wherein the control unit interpolates linearly on the basis of the average temperature of the wind speed below the specific temperature and the continuous temperature of the excess continuous wind phase to identify the position of the wind phase that has reached the specific temperature. Or, it provides a speed control device of the iron ore sintering machine characterized in that the interpolation of the curve on the basis of the average temperature of the wind phase and the excess continuous wind phase that exceeds the specific temperature to determine the position of the wind phase has reached the specific temperature. .

The temperature measuring means is composed of a thermoelectric element, and is installed in the same position in the center position of the sub gate of the hopper for supplying iron ore to the sintering machine bogie for each wind phase, from the wind direction of the position where the temperature of the exhaust gas rises rapidly to the last wind phase. do.

The present invention relates to a speed control method of a sintering machine to control the bogie speed of the iron ore sintering machine through a position controller, the method comprising: (a) measuring the temperature of the exhaust gas discharged from the sintering bogie at a plurality of positions in the width direction and the average temperature Obtaining a; (b) checking the position of the wind phase at which the average temperature reaches a specific temperature set according to the sintering completion temperature of the photographic ore and the position at which the temperature is measured and the distance between the sintering machine bogies and inputting the corresponding wind position to the position controller. It also provides a method for controlling the speed of the iron ore sintering machine comprising a.

The step (b) is a method of identifying the position of the wind image reaches the specific temperature by interpolating linearly on the basis of the average temperature of the average wind temperature is lower than the specific temperature and the continuous temperature of the excess continuous wind image; The position of the wind image that reaches a specific temperature is determined by one of the methods of confirming the position of the wind image that reaches the specific temperature by interpolating the curve based on the average temperature of the wind image below and the excess continuous wind image.

(Example)

Hereinafter, an apparatus and a method for controlling a speed of an iron ore sintering machine according to the present invention will be described in detail with reference to the accompanying drawings.

The speed control device of the iron ore sintering machine according to the present invention, as shown in Figure 1, the angle located in the lower portion of the sintering machine bogie 1 in the sintering machine supplied with the sintering raw material through the sub-gate 12 of the hopper 10 A plurality of thermoelectric elements 5 for measuring the temperature of the exhaust gas drawn from the sintering machine trolley 1 at the wind phase 3 are provided at regular intervals.

At this time, the air phase in which the thermoelectric element 5 is installed is not installed in all the air phases of the sintering machine, but the width of the air phases is about 10 or more from the wind direction at the position where the temperature of the exhaust gas rises sharply to the last one. About 7 thermoelectric elements are installed in the direction. In this case, the width direction position of the thermoelectric element 3 is based on the center position of the sub gate 12, and thus, the number of installations in the width direction is preferably determined by the number of sub gates 12. . In the embodiment of the present invention, there are about 70 thermoelectric elements 5 installed.

The 70 thermoelectric elements are converted into digital data through respective converters 20 and outputted (only one converter is illustrated in FIG. 1).

The output of the plurality of thermoelectric elements 5 converted into digital data by the converter 20 as described above is input to the control unit 25, the control unit 25 using the input temperature data of the wind phase characteristics of the present invention By inputting the wind-up position data for the constant temperature singular point control to the position controller 30, the position controller 30 to automatically control the speed of the sintering machine bogie.

Here, the position controller 30 controls the rotational speed of the drive unit 15 of the sintering machine in order to control the speed of the sintering machine bogie is a component mounted to the existing sintering machine.

Before describing the operation of the present invention having the configuration described above, the control characteristics of a general sintering machine will be described.

When the temperature of the exhaust gas discharged from the sintering machine is analyzed based on the longitudinal direction of the sintering machine, the firing state information is included, and the firing state deviation information of each sintering machine can be obtained through the temperature distribution in the width direction of each sintering machine bogie. Can be.

In order to confirm the accurate temperature distribution, the installation position of the thermoelectric element 3 that measures the temperature of the exhaust gas discharged from the sintering truck, that is, the temperature measurement point, should be located within 50 mm from the bottom of the sintering truck. All of these must be constant to reduce errors due to the position of the measuring point.

Therefore, since the position measured by the thermoelectric element 3 is a position away from the sintering machine bogie, the actual measured temperature is measured lower than the temperature of the exhaust gas discharged from the sintering bogie.

In the present invention, the temperature of the constant temperature singularity is defined as 200 ° C. below. That is, the constant temperature singularity (T200) means the wind direction of the position where the exhaust gas temperature reaches 200 ℃.

Referring to the estimating step of the constant temperature singularity (T200), the average temperature of the temperature measured through the thermoelectric element disposed in the width direction of each sintering machine of each wind phase is obtained, and the wind phase where this average temperature reaches 200 ° C is confirmed.

In other words, when the position of the wind phase whose average temperature of each wind phase is 200 degreeC or more or less is confirmed, the position of the sintering machine whose temperature of the wind phase located in the middle is near 200 degreeC can be confirmed. That is, if the average temperature of the exhaust gas is linearly interpolated on the basis of the average temperature of the wind phase below 200 ° C. and the excess continuous wind phase, the position of the sintering machine reaching the 200 ° C. temperature between the excess wind phase and the under wind phase is reached. You can get it.

After determining the wind position of the position of the constant temperature singularity (T200) thus identified, and inputting the wind position data to the position controller 30, the position controller 30 automatically adjusts the speed of the sintering machine bogie.

Furthermore, instead of a method of confirming the position of the wind image that reaches the specific temperature by linear interpolation based on the average temperature where the average temperature falls below the specific temperature and the continuous temperature of the excess continuous wind image, the wind image falls below the specific temperature. It is also possible to interpolate the curves based on the average temperatures of excess windages in excess to determine the location of the windage that has reached this particular temperature.

Hereinafter, the features of the above-mentioned constant temperature singularity T200 will be described.

In the present invention, the sintering machine wind phase is connected to one exhaust pipe, so that the exhaust gas temperature pattern is always similar, contemplating the constant temperature specific point (T200), which is a new plasticity singularity defined as (T200) that the exhaust gas temperature reaches 200 ° C. This is implemented in the sinter speed control.

Constant temperature singularity (T200) has the advantage that can always be easily calculated by simply interpolating in the sintering machine, such as the BRP, simply by one-dimensional interpolation can greatly reduce the computational load according to the PLC control.

That is, as can be seen in Fig. 2, the position of the BTP point changes extremely sensitive to the change of the exhaust gas temperature, and BRP tends to be the opposite. By the way, the constant temperature singularity (T200) of the present invention, while the control point, which is the advantage of BRP is always present in the sintering machine, and alleviates the problem of not sensitive to the temperature of the BRP in addition to the advantage of ensuring the stability of the control, in particular, it is less than a certain temperature By simply interpolating on the basis of the average temperature of the wind phase and the excess continuous wind phase, the position of the wind phase where the exhaust gas temperature reaches a certain temperature can be calculated, thus greatly simplifying the calculation process and reducing the burden on the control system. It is an advantage.

3 shows a graph of BTP, BRP, and T200 trends in a large sintering machine that maintains high productivity. As expected, the variation in plastic singularity is greatly changed in the order of T200, BRP, and BTP.

4 and 5 show the correlation between the plasticity singularity BTP, BRP, T200, except for BTP it can be seen that the cross-correlation between the other plasticity singularity is large.

Table 1 shows the statistical analysis of various plastic singularities during the analysis period. Except for the divergence (42 ~ 49%) in daily operation that maintains high productivity, it can be seen that the BTP is operating properly with a standard deviation of 0.72 to 1.12. We can infer divergence.

As shown in Table 1, the standard deviation of the plasticity singularity during the analysis period was calculated to be 17.01 for BTP, 2.16 for BRP, and 0.96 for T200, and T200 was significantly more stable than BTP.

On the other hand, since the T200 is calculated by simple interpolation, compared to BTP and quadratic curve system BRP, the burden of the position controller 30 can be reduced.

In addition, since the T200 measurement point is located in front of the sintering machine compared to the measurement point used for the calculation of BTP and BRP, the time form (Time Lag) required for control can be shortened by 5 minutes or more compared to BTP and BRP.

And, Table 2 compares the operation results of the sintering machine according to the present invention before and after.

Compared with before and after system application, the sintering machine speed, which is the absolute standard of process change, increased from 2.88 (m / min) to 2.91, the standard deviation decreased from 0.23 to 0.12, and the flame front speed. FFS) increased from 21.11 to 21.55 on average, the deviation decreased from 1.53 to 0.94, and the exhaust gas air temperature increased from 140 ° C to 146 ° C and the deviation decreased from 25 ° to 11 °.

On the other hand, as a result of the operation, the productivity increased from 37.6 to 38.4 on average, the deviation decreased from 4.0 to 2.1, and the average particle size of sintered ore increased from 18.95 to 19.68 and the deviation decreased from 1.42 to 1.10.

BTP BRP T200 T150 X _all X≤26 % One Ave. 28.49 24.54 58 21.39 20.46 19.68 Std. 18.83 0.72 1.89 0.80 0.77 2 Ave. 28.52 24.22 53 21.23 19.94 19.06 Std. 14.96 1.12 3.49 1.43 1.37 3 Ave. 30.64 24.49 51 21.51 20.37 19.58 Std. 17.25 0.84 1.10 0.65 0.67

Before application After application Average Standard Deviation Average Standard Deviation Sinterer Speed (m / s) 2.88 0.23 2.91 0.12 BTP temperature (℃) 404.41 46.12 415.41 48.25 FFS (m / s) 21.11 1.53 21.55 0.94 Wind temperature (℃) 140.34 24.53 146.60 10.88 Negative pressure (mmAq) 1660.99 203.43 1681.06 123.66 Productivity (T / d / m2) 37.58 4.00 38.41 2.11 Recovery rate of character (net,%) 76.84 2.86 74.58 3.03 Average particle size (mm) 18.95 1.46 19.68 1.10 Room temperature strength (%) 94. 56 0.98 94.42 1.11

In general, as the sintering speed increases, the variation of the process and operation index is usually increased, but the sintering speed according to the present invention is increased, but the variation of the process and the operation is rather reduced, and thus the present invention is simple. The control stability is very high by the control algorithm.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and the general knowledge in the technical field to which the present invention pertains without departing from the spirit of the present invention. Various changes and modifications will be made by those who possess.

1 is a block diagram for explaining a speed control device of the iron ore sintering machine according to the present invention.

Figure 2 is a conceptual diagram for explaining the plasticity singularity in the present invention.

3 is a graph showing various plastic singularity changes in an actual sintering machine.

4 is a graph showing a relationship between a firing complete point (BTP) and a plastic inflection point (BRP) in an actual sintering machine.

5 is a graph showing the relationship between the plastic inflection point (BRP) and the constant temperature singularity in the actual sintering machine.

Explanation of symbols on the main parts of the drawings

1: balance of sintering machine 3: wind

5: thermoelectric element 10: hopper

11: drum feeder 12: sub gate

15: drive unit 20: converter

25 controller 30 position controller

Claims (5)

In the speed control apparatus of the sintering machine for controlling the bogie speed of the iron ore sintering machine through a position controller, A plurality of temperature measuring means installed at predetermined intervals for each wind phase of the sintering machine to measure the temperature of the exhaust gas discharged from the sintering machine cart; The temperature of the wind phase measured by the plurality of temperature measuring means checks the position of the wind phase reaches a specific temperature set according to the sintering completion temperature of the photographic ore and the position at which the temperature is measured and the distance between the sintering machine bogie and input to the position controller A control unit for controlling the speed; The controller checks the position of the wind image that reaches the specific temperature by interpolating linearly based on the average temperature of which the average temperature is lower than the specific temperature and the continuous temperature of the continuous continuous wind image. A speed control device for an iron ore sintering machine, characterized in that the interpolation of curves is confirmed on the basis of the average temperature of the continuous wind phases exceeding to determine the position of the wind phase that has reached the specific temperature. The apparatus of claim 1, wherein the temperature measuring means is made of a thermoelectric element. The said temperature measurement means is located in the center position of the sub-gate of the hopper which supplies iron ore to a sintering machine trolley for each wind phase from the wind direction of the position to which the temperature of exhaust gas rises rapidly to the last wind phase. Speed control device of iron ore sintering machine, characterized in that installed in the same number. In the speed control method of the sintering machine to control the bogie speed of the iron ore sintering machine through a position controller, (A) measuring the temperature of the exhaust gas discharged from the sintering machine bogie at a plurality of locations in the width direction to obtain the average temperature; (b) checking the position of the wind phase at which the average temperature reaches a specific temperature set according to the sintering completion temperature of the photographic ore and the position at which the temperature is measured and the distance between the sintering machine bogies and inputting the corresponding wind position to the position controller. Speed control method of the iron ore sintering machine comprising a. 5. The method of claim 4, wherein the step (b) determines the position of the wind phase at which the average temperature reaches the specific temperature by interpolating linearly on the basis of the average temperature at which the average temperature is below the specific temperature and the average temperature of the continuous continuous wind phase. A wind image that reaches a specific temperature by any of the methods and a method of identifying the position of the wind image that has reached the specific temperature by interpolating the curve based on the average temperature of the wind image below the specified temperature and the excess continuous wind image. Speed control method of the iron ore sintering machine, characterized in that for checking the position of.