JPH0931555A - Method for controlling sintering temperature pattern and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method of a sintering temp. pattern which can quickly and accurately return back to a prescribed temp. pattern even if the sintering temp. pattern varies by change of a sintering operational condition. SOLUTION: The adjusting quantity of the number of revolutions of an exhauster is obtd. from each average value and tendency value at a long period, short period and extremely short period of sintering exhaust gas in a wind box in any position in an interval from the position where the temp. of the sintering exhaust gas most quickly raises, to the position where becomes the highest temp., further an average value and a tendency value of returning ore producing quantity in a prescribed term and an evaluating index of the number of revolutions of the exhauster.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for controlling a sintering temperature pattern in a sintering operation for producing a sintered ore as a raw material for a blast furnace.

[0002]

2. Description of the Related Art In a sintering reaction in a sintering machine, a combustion part is formed by igniting an upper layer of a sintering raw material in an ignition furnace, and the combustion part changes from the upper layer to the lower layer with time, that is, as the pallet moves. The process is completed by disappearing the unsintered layer. Generally, the temperature distribution of the sintering exhaust gas during the sintering operation has a pattern as shown in Fig. 2 (b), and in order to obtain the sintered ore with good thermal efficiency and high production yield, the sintering temperature pattern should be changed. It is an indispensable condition to control properly according to. An important sintering completion point (BTP; Burn Through P) for controlling this sintering temperature pattern.
oint) is measured by measuring the temperature of the sintering exhaust gas passing through each wind box (WB), and is grasped by the position of the point where the temperature becomes the highest.

For example, in Japanese Unexamined Patent Publication No. 54-48608, the position of the BTP is the position of the windbox in the machine length direction of the sintering machine as one criterion, and the position of the windbox showing the maximum temperature, and Assuming that the distribution of the sintering exhaust gas temperature in the wind box before and after that is a quadratic curve that is convex upward, calculate the position that shows the maximum temperature, and find it so that this position becomes the target position. A technique for adjusting the rotation speed of a blower and controlling the sintering temperature pattern is described.

[0004]

However, in recent years, in order to reduce the power cost of the exhaust fan, the BT
Since P is operated as close as possible to the side of the mining section, in the technique described in JP-A-54-48608, BTP is used.
However, due to the influence of air leaks from the mine, the actual BTP and the position of the observed BTP obtained from the measured temperature constantly deviate, and accurate control cannot be performed. Furthermore, when operating at a position where the true BTP exceeds the mine ore in order to reduce the amount of air leakage from the mine, the BTP may not be detected. Had the problem of.

The present invention has been made in view of the above circumstances, and can quickly and accurately return to a predetermined temperature pattern even if the sintering operation pattern changes and the sintering temperature pattern changes. An object of the present invention is to provide a method of controlling a sintering temperature pattern and a device therefor.

[0006]

According to the present invention, there is provided a semiconductor device comprising:
The method for controlling the sintering temperature pattern described is, after the sintering raw material is charged on the sintering pallet, it is ignited from above and the sintering exhaust gas is sequentially passed from below the sintering pallet through a wind box, a dust collector, and an exhaust fan. While producing a sinter, while cooling this sinter and sizing, sinter having a predetermined particle size or less generated during this sizing is recovered as a return ore and operating, In the method for controlling the sintering temperature pattern for adjusting the rotation speed of the exhaust fan that sucks the bound exhaust gas, the sintering exhaust gas temperature is set at any position between the position where the temperature of the exhaust gas rises most and the position where the temperature becomes the maximum. The sintering exhaust gas temperature in the wind box at the time is measured, and the time-dependent sintering exhaust gas temperature data within the measured predetermined period is divided into long-term, short-term, and ultra-short-term,
Obtain the average value and the trend value of the sintering exhaust gas temperature in each of the divided periods, and obtain the long-term temperature evaluation index, the short-term temperature evaluation index, and the ultra-short-term temperature evaluation index, respectively, from the average value and the trend value of each of the divided periods, and further, The amount of the returned ore is measured over time, and the average value and the tendency value are obtained from the amount of the returned ore generated over time in the measured predetermined period, and from the average value and the tendency value of the amount of the returned ore. The return ore generation amount evaluation index is obtained, the long-term firing state evaluation index of the sintering raw material is obtained from the return ore generation amount evaluation index and the long-term temperature evaluation index, and the long-term firing state evaluation index, the short-term temperature evaluation index and the pole The overall evaluation index of the sintering state of the sintering raw material is obtained from the short-term temperature evaluation index, while the rotation speed of the exhaust gas suction exhaust fan is measured, and the rotation speed obtained by evaluating the rotation speed within a predetermined period is evaluated. The blower according to the index and the firing state comprehensive evaluation index Determine the increase or decrease adjustment amount of the rotational speed, adjusting the rotational speed of the exhaust fan on the basis of the increase or decrease adjustment amount of the rotational speed of the exhauster.

In the method for controlling the sintering temperature pattern according to claim 2, in the method for controlling the sintering temperature pattern according to claim 1, the place where the temperature of the sintering exhaust gas is measured is the temperature at which the sintering exhaust gas temperature rises most. Set it at or near a position that will be rapid.

According to a third aspect of the present invention, there is provided a sintering temperature pattern control device in which a sintering raw material is charged on a sintering pallet and then ignited from above, and a wind box, a dust collector, and an exhauster are installed from below the sintering pallet. Sintering gas is sequentially sucked through to produce sinter, and the sinter is cooled and sized, and sinter having a predetermined particle size or less generated during sizing is recovered as return ore. In operation, in a sintering temperature pattern control device that adjusts the rotation speed of an exhaust fan that sucks in the sintering exhaust gas, the sintering in a wind box located downstream of the position where the temperature of the sintering exhaust gas rapidly increases. The storage exhaust gas temperature, the amount of the returned ore, and the rotational speed of the exhaust fan are measured and stored over time, and the sintering exhaust gas temperature data over a predetermined period from the storage unit is stored for a long term and a short term. , It is divided into extremely short periods, and the sintering exhaust gas of each divided period is A temperature evaluation unit that obtains the average value and the tendency value of the temperature, and a temperature that obtains the long-term temperature evaluation index, the short-term temperature evaluation index, and the ultra-short-term temperature evaluation index from the average value and the tendency value of each divided period obtained by the temperature evaluation unit. The index determination unit and the average value and the tendency value are calculated from the stored amount of the returned ore over time within the predetermined period, and the return ore generation evaluation index is calculated from the average value and the tendency value of the returned ore generation amount. The return ore generation amount evaluation index determination unit, the return ore generation amount evaluation index from the return ore generation amount evaluation index determination unit and the long-term firing state evaluation index of the sintering raw material by the long-term temperature evaluation index from the temperature index determination unit. From the long-term firing state evaluation unit to be sought, the long-term firing state evaluation index from the long-term firing state evaluation unit, the short-term temperature evaluation index from the temperature index determination unit, and the ultra-short-term temperature evaluation index, the firing state comprehensive evaluation index of the sintering raw material Comprehensive firing conditions And a rotation speed evaluation unit for evaluating the rotation speed data of the exhaust fan held in the storage unit, and the exhaust speed is evaluated by the rotation speed evaluation index and the firing state comprehensive evaluation index obtained from the rotation speed evaluation unit. An exhaust fan rotation speed adjustment amount determining unit that obtains an increase / decrease adjustment amount of the rotation speed of the wind blower, and the rotation speed of the exhaust fan is adjusted based on the increase / decrease adjustment amount of the exhaust fan rotation speed adjustment amount determining unit. It has a control unit to operate.

The long-term, short-term, and ultra-short-term classifications of the sintering exhaust gas temperature data are set in consideration of the time constant in the operation of the sintering machine, the cycle time such as return ore, and the result of empirical performance evaluation. It is a period of time, and is a range of time divided so that the sintering temperature pattern can be controlled and evaluated most appropriately and efficiently. For example, the long-term classification is set to about 8 hours to 24 hours, which traces back the present time, and the influence of the temperature level (heat) under the same proportion of the ore mixture is determined. Further, in order to avoid the influence of disturbance, the long-term segment is unclear in about 1 to 2 hours, and preferably in the range of about 12 to 24 hours. Furthermore, the short-term classification is set to 1 hour to 4 hours, preferably 1.5 hours to 3 hours, and the influence of fluctuation factors corresponding to the cycle (about 3 hours) in which the return ore circulates in the sintering machine is appropriately set. It is desirable to evaluate. In addition, the very short term classification is the time (about 10 to 2) until the result of the operation of adjusting the rotation speed of the exhaust fan is reflected in the actual temperature of the wind box.
0 minutes), preferably within 1 hour, preferably 10 minutes to 20 minutes
It is preferable to set the time to about a minute since it is possible to accurately grasp the fluctuation of the burning portion of the sintering raw material that most affects the sintering temperature pattern. The tendency value of the sintering exhaust gas temperature is the measured data in each of the three periods of long-term, short-term, and ultra-short-term divided into the first half and the second half, and the first half and the second half. It means the difference between the average values.
The position where the temperature of the sintering exhaust gas rises most rapidly,
For example, when the temperature pattern of the sintering exhaust gas is approximated by a part of a cubic curve including a minimum value and a maximum value, a position corresponding to an inflection point between the minimum value and the maximum value, that is, the third order The position where the second derivative is zero on the curve.

[0010]

In the method for controlling the sintering temperature pattern according to any one of claims 1 and 2, the wind at any position between the position where the temperature of the sintering exhaust gas rises most rapidly and the position where it reaches the maximum temperature. Long-term, short-term, and extremely short-term average and trend values of the sintering exhaust gas temperature in the box, and the average value and trend value of the amount of return ore generated within a predetermined period, and the exhaust speed rotation speed evaluation index. Since the increase / decrease adjustment amount of the rotation speed of the exhaust fan is obtained by the above, the sintering temperature pattern can be controlled by reflecting the temperature of the sintering exhaust gas, the amount of returned ore and the rotation speed of the exhaust fan. In addition, since the evaluation of the long-term firing state includes the return ore generation amount evaluation index that evaluates the amount of return ore (which is a fine-grained sintered ore that does not meet product specifications and is reused as a sintering raw material). It is possible to stabilize the quality and production of sinter. In particular, in the method for controlling the sintering temperature pattern according to the second aspect of the present invention, since the location for measuring the sintering exhaust gas temperature is set at a position where the sintering exhaust gas temperature rises most rapidly or in the vicinity thereof, the sintering temperature pattern control is performed. The responsiveness in can be maximized. The sintering temperature pattern control device according to claim 3, wherein the sintering exhaust gas temperature in the wind box downstream of the position where the temperature of the sintering exhaust gas rapidly rises, the amount of returned ore,
A storage unit that measures and stores the data of the rotation speed of the exhaust fan with time, and a temperature evaluation unit for the sintering exhaust gas temperature that evaluates the data and determines each evaluation index, a return ore occurrence evaluation index determination unit, an exhaust gas Since there is a control unit that adjusts the rotation speed of the exhaust fan by the rotation speed evaluation unit of the air blower, it is possible to control the sintering temperature pattern by accurately reflecting the change with time of each data.

[0011]

In the method for controlling the sintering temperature pattern according to claims 1 and 2 and the controller for the sintering temperature pattern according to claim 3, the sintering exhaust gas temperature in a predetermined air box is set at predetermined time intervals. Calculating in 3 steps, long-term, short-term, and ultra-short-term, evaluate this, and compare this evaluation value with the evaluation table created based on the know-how accumulated in the past sintering operation. Since it is possible to evaluate the state of, and accurately adjust the fluctuation of the sintering operation to adjust the rotation speed of the exhaust fan,
It is possible to improve the controllability of the sintering temperature pattern and suppress operational fluctuations. In addition, since the long-term firing state evaluation includes the return ore generation amount evaluation index that evaluates the return ore generation amount, it is possible to stabilize the quality and production of the sintered ore. Therefore, even if the sintering operation conditions change and the sintering temperature pattern fluctuates, it is possible to quickly and accurately return to the predetermined temperature pattern, which can contribute to the stability of the quality and production of the sintered ore. Particularly, in the method for controlling the sintering temperature pattern according to the second aspect, it is possible to maximize the responsiveness in controlling the sintering temperature pattern and to stably control the sintering temperature pattern without losing its shape. It is suitable, and the rotation speed of the exhaust fan can be adjusted by sensitively reflecting the influence of the change in the air permeability of the sintering raw material layer and the change in the heat level.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the attached drawings, an embodiment in which the present invention is embodied will be described to provide an understanding of the present invention. FIG. 1 is an explanatory view of a method for controlling a sintering temperature pattern according to the embodiment of the present invention, and FIG.
(A) and (b) are explanatory views of a sintering machine to which the method for controlling a sintering temperature pattern according to the embodiment of the present invention is applied, and a temperature distribution in each wind box, and FIG. 3 is a measurement in the wind box. FIG. 4 is a diagram for explaining a long-term time change of temperature, FIG. 4 is a diagram for explaining a short-term time change of the measured temperature in the wind box, and FIG. 5 is a diagram for explaining an extremely short-term time change of the measured temperature in the wind box. Is.

As shown in FIG. 2 (a), the sintering machine 10 includes a sintering raw material 11 composed of iron ore, an auxiliary raw material, powder coke and the like.
A pallet 12 on which is placed and moved, an ignition furnace 13 for igniting the surface of the sintering raw material 11, and a wind box (WB: wind box) fixed below the pallet 12 for sucking air
16 to 21, combustion chamber exhaust gas from the wind box 16 to 21
Exhaust system (MB: Main blower) 22, which exhausts through
And a control device 25. The sintering exhaust gas temperature is obtained by providing a thermometer 24 in the wind box 18 arranged at the fourth position from the exhausting section 23 of the sintering machine 10 and measuring at a predetermined time interval or continuously. In addition, as a method of measuring the amount of returned ore, for example, by providing a merick (measuring machine) for measuring the transferred amount on a transfer conveyor that is in the middle of transferring the generated returned ore to a returned ore hopper (not shown). Method of measuring, measuring the cutting amount and level of the return ore hopper,
There is a method of calculating the generated amount from the difference.

The sintering machine 10 is a DL having an effective machine length of 120 m, an effective machine width of 5 m, and a production capacity of about 18,000 t / day.
It is a (D weight Lloyd) type sintering machine. On the pallet 12, the sintering raw material is charged by a drum feeder or the like (not shown) so that the layer thickness of the sintering raw material is about 600 mm, the firing temperature is about 1360 ° C., and the pallet speed is 3.4 to.
The sintering raw material is processed under a sintering condition of 3.6 m / min.
In addition, the exhaust fan 22 has an air volume of 27,000 Nm ³ / min and a negative pressure of 2
It has a capacity of 000 mmH ₂ O and a motor capacity of 11800 kW, and its rotation speed can be adjusted via the control device 25.

The control device 25 for controlling the rotation speed of the exhaust fan 22 will be described below with reference to FIG. The control device 25 includes a storage unit 100, a temperature evaluation unit 101, a temperature index determination unit 102, a return ore generation amount evaluation index determination unit 103, a long-term firing state evaluation unit 104, a firing state evaluation unit 105, a firing state comprehensive evaluation unit 106, It includes a rotation speed evaluation unit 107, an MB rotation speed adjustment amount determination unit 108, and a control unit 109. The storage unit 100 includes a temperature storage unit 100a and a return ore storage unit 100b, M
It is configured by a B (exhaust fan) rotation speed storage unit 100c. Then, the temperature storage unit 100a inputs the measurement value measured by the thermometer 24 provided in the wind box 18 and stores the change over time of the sintering exhaust gas temperature. Further, the returned ore storage unit 10
For 0b, the generation amount of the returned ore obtained as described above is input and stored over time. Further, the MB rotation speed storage unit 100c successively inputs and stores the rotation speed of the exhaust fan 22 measured by a rotation speed meter (not shown).

The temperature evaluation unit 101 is a long-term temperature evaluation unit 10.
1a, short-term temperature evaluation unit 101b, ultra-short-term temperature evaluation unit 10
1c. Then, in the long-term temperature evaluation unit 101a, as shown in FIG. 3, from the temperature storage unit 100a, 24 hours of time-dependent sintering exhaust gas temperature information measured at 24 points at 1-hour intervals is input, and this firing is performed. 12 hours for the first half (1-12), 1 for the second half
It is divided into 2 hours (13 to 24). Then, the long-term temperature average value T _{1 for} 24 hours, the average value Ta for the first 12 hours, and the average value Tb for the last 12 hours are obtained. Further, the difference (Ta-Tb) between the first half average value Ta and the second half average value Tb is obtained, and this is set as the long-term temperature tendency value ΔT ₁ .

As shown in FIG. 4, the short-term temperature evaluation unit 101b inputs information on the temperature of the sintering exhaust gas for 3 hours measured at 18 points at 10-minute intervals as shown in FIG. Then, the first half 90 minutes (1 to 9) and the second half 90 minutes (10 to 18) are divided into two. Furthermore, the short-term average value T ₂ for 3 hours is calculated, and the first half average value Tc of both sections is calculated.
, The latter half average value Td is obtained, and the difference (Tc-Td) between the first half 90 minutes average value Tc and the latter half 90 minutes average value Td.
Is obtained, and this is taken as the short-term temperature tendency value ΔT ₂ .

Information on the temperature of the sintering exhaust gas for 20 minutes is input from the temperature storage section 100a to the extremely short-term temperature evaluation section 101c, and as shown in FIG.
7) and the latter half 10 minutes (8 to 14). Then, while obtaining the extremely short-term average value T ₃ for these 20 minutes,
Average value Te in the first half 10 minutes and average value Tf in the second half 10 minutes
And the difference (Te-Tf) between these two average values is taken as the extremely short-term temperature tendency value ΔT ₃ .

Further, the temperature index determining unit 102 comprises a long-term temperature index determining unit 102a, a short-term temperature index determining unit 102b, and an extremely short-term temperature index determining unit 102c. Hereinafter, a method of determining the evaluation index in the temperature index determining unit 102 will be described in detail with reference to Tables 1 to 3. These comparison tables were created based on a vast amount of past data obtained in the sintering operation and a knowledge base that summarizes the knowledge obtained by analyzing them. It is configured in a tabular form so that it can be uniquely determined from the data of the sintering exhaust gas temperature in the wind box 18 at that time.

The long-term temperature index determining unit 102a, the short-term temperature index determining unit 102b, and the extremely short-term temperature index determining unit 10
2c is the long-term temperature evaluation unit to the ultra-short-term temperature evaluation unit (10
1a to 101c), the respective average values and tendency values are input, and these values and preset temperature evaluations (long-term temperature evaluation, short-term temperature evaluation, ultra-short-term temperature evaluation) shown in Tables 1 to 3 Each temperature evaluation index (+2, +
Any one of 1, 0, -1, and -2) is obtained. Table 1 here
~ Each temperature tendency value (ΔT ₁ , Δ shown on the horizontal axis of Table 3)
T ₂ and ΔT ₃ ) evaluation levels of “large rise”, “small rise”, “level”, “small fall”, and “large fall” are the temperature tendency values (ΔT ₁ , ΔT ₂ , ΔT ₃ ) is 10 ° C. or higher, 10 to 5 ° C., 5 to −5 ° C., −5 to −10, respectively.
It is defined as a state of ℃ and -10 ℃ or less. In addition, "large upper limit deviation", "small upper limit deviation", which are evaluation levels of each temperature average value shown by the vertical axis in Tables 1 to 3,
"Normal", "Small out of the lower limit" and "Large out of the lower limit" means that when the temperature average values (T ₁ , T ₂ , T ₃ ) are higher than the target upper limit value by 5 ° C or more, Within + 5 ° C, between the target upper limit and the target lower limit,
When the temperature is within −5 ° C. from the target lower limit value, it is defined as the state when it is lower than the target lower limit value by 5 ° C. or more. The target upper limit value and the target lower limit value differ depending on the long-term temperature, short-term temperature, and ultra-short-term temperature. Therefore, when the long-term temperature average value T ₁ is within the range from the target upper limit value to the target lower limit value, that is, “normal”, and the long-term temperature tendency value ΔT ₁ is 15 ° C., that is, “large increase”, Table 1
Therefore, the long-term temperature evaluation index at this time is determined as (0). Similarly, using Table 2, the short-term temperature average value T ₂ and the short-term temperature tendency value ΔT ₂ are “normal”, respectively.
The short-term temperature evaluation index in the case of being “flat” is (0), and using Table 3, the extreme short-term temperature average value T ₃ and the extreme short-term temperature tendency value ΔT ₃ are “outside upper limit large” and “downward small”, respectively. The extremely short-term temperature evaluation index at that time is (+1).

[0021]

[Table 1]

[0022]

[Table 2]

[0023]

[Table 3]

The return ore generation amount evaluation index determination unit 103
Is the return ore generation amount evaluation unit 103a and the return ore generation amount index determination unit 1
It consists of 03b. The returned mine generation amount evaluation unit 103a measures 24 points at an interval of 1 hour from the returned mine storage unit 100b.
Information on the amount of returned ore generated over time is input, and the amount of returned ore generated is divided into the first half 12 hours and the second half 12 hours. Then, the average value R of the returned ore generation amount in 24 hours, the average value Ra in the first half 12 hours, and the average value Rb in the second half 12 hours are obtained. Further, the difference (Ra-Rb) between the first half average value Ra and the second half average value Rb is obtained, and this is set as the return ore generation amount tendency value ΔR.

Hereinafter, the return ore generation index determining unit 103b
The index determination method will be described in detail with reference to Table 4, which is an evaluation table. This evaluation table was created on the basis of the knowledge base in which the vast amount of past data obtained in the sintering operation and the knowledge obtained by analyzing them were aggregated in the same manner as described above. The condition of the above is configured in a tabular format so that it can be uniquely judged from the measured data of the amount of returned ore at that time. This return ore generation index determination unit 1
03b inputs the returned ore generation amount average value R and the returned ore generation amount tendency value ΔR from the returned ore generation amount evaluation unit 103a, and collates these values with the preset returned ore generation amount evaluation table shown in Table 4. Then, the evaluation index (any one of +2, +1, 0, -1, and -2) is obtained. As shown by the horizontal axis in Table 4, the return ore generation tendency value ΔR is "upward large", "upward small", "level", "downward small", and "downward large". The generated amount tendency value ΔR is 10 wt% or more, 10 to 5 w
t%, 5 to -5 wt%, -5 to -10 wt%, and -1
It is defined as a state of 0 wt% or less. Also, as shown by the vertical axis in Table 4, the state of the return ore generation average value R being "large upper limit deviation", "small upper limit deviation", "normal", "small lower limit deviation", and "large lower limit deviation" The term "return ore generation average value R" is higher than the target upper limit value by 5 wt% or more, is within +5 wt% from the target upper limit value, is between the target upper limit value and the target lower limit value, and is lower than the target lower limit value. 5 wt
When it is within%, it is defined as the state when it is lower than the target lower limit value by 5 wt% or more. Therefore, the return value average R is within the range between the target upper limit value and the target lower limit value, that is, "normal", and the return value tendency value ΔR
Is 15 wt%, that is, "large increase", the evaluation index of the return ore generation index determining unit 103b at this time is determined as (+1) according to Table 4.

[0026]

[Table 4]

Next, the long-term firing state evaluation unit 104 which integrates the respective evaluation indexes obtained by the long-term temperature index determination unit 102a and the return ore generation amount index determination unit 103b will be described. The long-term firing state evaluation unit 104 includes an evaluation index determined by the long-term temperature index determination unit 102a and a return ore generation index determination unit 1.
The evaluation index obtained in 03b is input, and the evaluation index (any one of +2, +1, 0, -1, and -2) is calculated by comparing both the evaluation indices with the preset firing evaluation table shown in Table 5. . For example, as described above, the long-term temperature index determination unit 1
When the evaluation indexes of the 02a and the return ore generation index determining unit 103b are (+1) and (−1), respectively, the evaluation indexes of the long-term firing state evaluation integrating these are (+1) as determined from Table 5. Becomes Therefore, by performing the above operation, using the temperature data of the wind box 18 in the sintering operation, the evaluation index (+2, +1, 0, -1, -2) as the evaluation of firing in a macroscopic view. You can ask for either).

[0028]

[Table 5]

Further, the firing state evaluation unit 105 which integrates the respective evaluation indexes obtained by the long-term firing state evaluation unit 104 and the short-term temperature index determination unit 102b will be described.
The firing state evaluation unit 105 is a long-term firing state evaluation unit 104.
By inputting the evaluation index obtained in 1. and the evaluation index obtained in the short-term temperature index determination unit 102b, and comparing both evaluation indexes with the preset firing state evaluation table shown in Table 6, the evaluation index (+2, +1, 0, -1, or -2) is obtained. For example, as described above, the long-term firing state evaluation unit 104
When the evaluation indices of the short-term temperature index determination unit 102b are (0) and (+1), respectively, the firing state evaluation index integrating them is (0) as determined from Table 6.

[0030]

[Table 6]

Next, the firing state comprehensive evaluation unit 106 which integrates the respective firing indices obtained by the firing state evaluation unit 105 and the ultra short-term temperature index determination unit 102c will be described.
The firing state comprehensive evaluation unit 106 is a firing state evaluation unit 105.
By inputting the evaluation index obtained in (1) and the evaluation index obtained in the ultra short-term temperature index determining unit 102c, the firing state comprehensive evaluation index (+2, (Any one of +1, 0, -1, and -2). For example, as described above, when the evaluation indices of the firing state evaluation unit 105 and the ultra short-term temperature index determination unit 102c are (0) and (+1), respectively, the firing state comprehensive evaluation index that integrates these is determined from Table 7. It becomes (0). Therefore, by performing the above operation, the micro-firing state is evaluated using the temperature data of the wind box 18 in the sintering operation, and the firing state comprehensive evaluation index (+
Any of 2, +1, 0, -1, and -2) can be obtained.

[0032]

[Table 7]

Then, the rotation speed evaluation unit 107 includes a current MB rotation speed evaluation unit 107a and an MB rotation speed change elapsed time evaluation unit 1.
07b. The current MB rotation speed evaluation unit 107a
The rotation speed of the exhaust fan 22 stored in the MB rotation speed storage unit 100c is input, and the rotation speed is represented by a current MB rotation speed evaluation index X to Z (X: an upper limit value or more, which is an example of the rotation speed evaluation index, Y: upper limit value to lower limit value, Z: less than or equal to lower limit value) is determined. Here, the upper and lower limits are preset values.

Further, the MB rotation speed change elapsed time evaluation unit 10
In 7b, the elapsed time Δt from the time when the rotation speed of the blower fan 22 was last adjusted to the time when control is to be performed, and the elapsed time Δt is compared with a preset invalid time ts, MB, which is an example of the rotation speed evaluation index
A rotation speed change elapsed time evaluation index (either A or B) is obtained. The evaluation indexes A and B are the cases where the elapsed time Δt after the rotation speed change is equal to or more than the invalid time ts and the case where the elapsed time Δt is less than the invalid time ts, respectively.

In the MB rotation speed adjustment amount determining unit 108, the firing condition comprehensive evaluation index, the MB rotation speed change elapsed time evaluation index, and the current condition M obtained by the firing condition comprehensive evaluation unit 106.
The adjustment amount of the rotation speed of the exhaust fan 22 is determined by collating the B rotation speed evaluation index with Table 8. When determining the adjustment amount of the rotation speed of the exhaust fan 22, the firing state comprehensive evaluation unit 1
06, MB rotation speed change elapsed time evaluation unit 107b, current state M
The number of possible combinations of the values of the three items of the B rotation speed evaluation unit 107a is 5 × 3 × 2 = 30, and for each of these 30 combinations, there are five stages of action determination defined in the knowledge base. Has been assigned. That is, the operation for adjusting the rotation speed of the air exhauster 22 is +10 rpm, +5 rpm, ± 0 rpm for each combination.
(Quiet), -5 rpm, -10 rpm.

[0036]

[Table 8]

For example, the rule No. 1, the MB rotation speed change elapsed time evaluation unit 107b, the current MB rotation speed evaluation unit 107a, and the firing state comprehensive evaluation unit 10 are shown.
When each evaluation index of 6 is (A, X, +2), the action determination is −10 rpm, and the current MB
A determination result that the number of revolutions is reduced by 10 rpm is obtained. Then, based on the determination result, the control unit 109 automatically controls the rotation speed of the exhaust fan 22. When the MB rotation speed change elapsed time evaluation index in the MB rotation speed change elapsed time evaluation unit 107b is B, the rotation speed of the exhaust fan 22 is finally adjusted, and the temperature change due to this adjustment is stabilized. Since the time required for No. in Table 8 has not elapsed,
As shown in 16 and 17, the rotation speed of the exhaust fan 22 is not controlled. Note that the above evaluations and judgments do not necessarily need to be compared on the evaluation table described above, and can be realized by a program that can perform equivalent operations on a computer.

In the present embodiment as described above, based on the past and present temperature data in the wind box and by reflecting the knowledge base data, the air blower can be operated without changing the pallet speed. It is possible to effectively control the sintering temperature pattern only by controlling the number of revolutions. Therefore, stable automatic control with little production fluctuation can be performed.
Moreover, each temperature evaluation (long-term, short-term, very short-term) was performed based on the temperature of the wind box at the position where the rate of change of the sintering exhaust gas temperature in the wind box was the maximum, to improve controllability. In the present invention, each temperature evaluation may be performed based on the temperature of the sintering exhaust gas in the air box corresponding to the position of the conventional BTP.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a sintering temperature pattern control method according to an embodiment of the present invention.

2 (a) and 2 (b) are respectively a sintering machine to which a method for controlling a sintering temperature pattern according to an embodiment of the present invention is applied,
3A and 3B are explanatory diagrams of temperature distribution in each wind box.

FIG. 3 is a diagram illustrating a long-term change in measured temperature in a wind box.

FIG. 4 is a diagram illustrating a short-term temporal change in measured temperature in a wind box.

FIG. 5 is a diagram for explaining a temporal change in measured temperature in a wind box for an extremely short period of time.

[Explanation of symbols]

10 Sintering machine 11 Sintering raw material 12 Pallet 13 Ignition furnace 16 Windbox 17 Windbox 18 Windbox 19 Windbox 20 Windbox 21 Windbox 22 Exhaust fan (MB) 23 Exhaust section 24 Thermometer 25 Controller 26 Dust collector 100 Storage unit 100a Temperature storage unit 100b Return ore storage unit 100c MB
Rotation speed storage unit 101 Temperature evaluation unit 101a Long-term temperature evaluation unit 101b Short-term temperature evaluation unit 101c Extreme short-term temperature evaluation unit 102 Temperature index determination unit 102a Long-term temperature index determination unit 102b Short-term temperature index determination unit 102c Extreme short-term temperature index determination unit 103 Return Ore generation evaluation index determination unit 103a Return ore generation amount evaluation unit 103b Return ore generation index determination unit 104 Long-term firing condition evaluation unit 105 Firing condition evaluation unit 106 Firing condition comprehensive evaluation unit 107 Rotation speed evaluation unit 107a Current MB rotation speed evaluation Unit 107b MB rotation speed change elapsed time evaluation unit 108 MB rotation speed adjustment amount determination unit 109 control unit

Claims (3)

[Claims] 1. A method of charging a sintering raw material onto a sintering pallet, igniting the sintering pallet from above, and sintering the sintering exhaust gas from below the sintering pallet through a wind box, a dust collector, and an air exhauster in this order. When the ore is manufactured, the sinter is cooled and sized, and the sinter having a predetermined particle size or less generated during the sizing is recovered as a return ore while operating, the exhaust gas for sucking the sintering exhaust gas is discharged. In a method for controlling a sintering temperature pattern for adjusting the number of revolutions of a blower, in the wind box at any position between a position where the temperature of the sintering exhaust gas rises most rapidly and a position where it reaches the maximum temperature. The sintering exhaust gas temperature is measured, and the time-dependent sintering exhaust gas temperature data within the measured predetermined period is divided into long-term, short-term, and ultra-short-term, and the average value and the trend value of the sintering exhaust gas temperature in each divided period are calculated. Calculated from the average value and trend value of each segment period The temperature evaluation index, the short-term temperature evaluation index, and the ultra-short-term temperature evaluation index are obtained, and the amount of the returned ore is measured over time, and the average is calculated from the amount of the returned ore over time within the measured predetermined period. The value and tendency value are obtained, the return ore generation amount evaluation index is obtained from the average value and tendency value of the return ore generation amount, and the long-term firing state of the sintering raw material is obtained from the return ore generation amount evaluation index and the long-term temperature evaluation index. An evaluation index is obtained, and an overall evaluation index of the sintering state of the sintering raw material is obtained from the long-term sintering state evaluation index, the short-term temperature evaluation index, and the ultra-short-term temperature evaluation index. The number of revolutions of the exhaust fan is measured by measuring the number of revolutions within a predetermined period, and the above-mentioned firing state comprehensive evaluation index is used to obtain an adjustment amount for increasing or decreasing the number of revolutions of the exhaust fan. Adjust the speed of the exhaust fan based on the adjustment amount The method of sintering temperature pattern characterized by Rukoto. 2. The control of the sintering temperature pattern according to claim 1, wherein the location where the sintering exhaust gas temperature is measured is set at a position where the temperature of the sintering exhaust gas temperature rises most rapidly or in the vicinity thereof. Method. 3. After charging the sintering raw material onto the sintering pallet, it is ignited from above and is sintered while sucking the sintering exhaust gas from below the sintering pallet through a wind box, a dust collector and an exhaust fan in order. When the ore is manufactured, the sinter is cooled and sized, and the sinter having a predetermined particle size or less generated during the sizing is recovered as a return ore while operating, the exhaust gas for sucking the sintering exhaust gas is discharged. In the control device of the sintering temperature pattern for adjusting the rotation speed of the wind blower, the temperature of the sintering exhaust gas is a sintering exhaust gas temperature in the wind box downstream from the position where the temperature rapidly rises, the amount of the returned ore, and A storage unit that measures and stores the number of revolutions of the exhaust fan with time, and the sintering exhaust gas temperature data from the storage unit over time within a predetermined period is divided into long-term, short-term, and ultra-short-term, and each divided period And the temperature evaluation part to find the average value and tendency value of the sintering exhaust gas temperature of A temperature index determination unit that determines a long-term temperature evaluation index, a short-term temperature evaluation index, and an ultra-short-term temperature evaluation index from the average value and tendency value of each divided period obtained by the temperature evaluation unit, and the time-course within the stored predetermined period. An average value and a tendency value are calculated from the amount of return ore generated, and an index for evaluating the amount of returned ore generation is calculated from the average value and the trend value of the amount of returned ore generation, and a return ore generation amount evaluation index determination unit, and the returned ore generation A long-term firing state evaluation unit that obtains a long-term firing state evaluation index of the sintering raw material from the return ore generation amount evaluation index from the volume evaluation index determination unit and the long-term temperature evaluation index from the temperature index determination unit; From the long-term firing state evaluation index from the temperature index determination unit and the short-term temperature evaluation index from the temperature index determination unit and the ultra-short-term temperature evaluation index to obtain the firing state comprehensive evaluation index of the sintering raw material, and the firing state comprehensive evaluation unit, which is stored in the storage unit. Times of the exhaust fan An exhaust fan rotation having a rotational speed evaluation unit for evaluating the rotational speed data, and obtaining an increase / decrease adjustment amount of the rotational speed of the exhaust fan by the rotational speed evaluation index obtained from the rotational speed evaluation unit and the firing state comprehensive evaluation index. A sintering temperature characterized by having a number adjustment amount determination unit and a control unit that adjusts the rotation speed of the exhaust fan based on the increase / decrease adjustment amount of the rotation speed of the exhaust air from the exhaust fan rotation speed adjustment amount determination unit. Pattern controller.