JPH0813047A - Method for controlling input quantity of heat in sintering machine - Google Patents

Abstract

PURPOSE:To provide a control method for input heat quantity in a sintering machine, by which the stable control can always be executed by restraining the variation of FeO content and yield. CONSTITUTION:A first relation indicating the correlation between the output heat quantity of raw material charged to the sintering machine and the FeO content contained in the sintered product 3 and/or a second relation indicating the correlation between the above output heat quantity and the yield of the product 3 are obtd. beforehand. The actually measured value of the above output heat is applied to the above first relation and/or the second relation to calculate the predicting value of the above FeO content and/or yield. The input heat quantity supplied to the sintering machine is controlled based on the difference between the calculated prediction value of the FeO content and/or yield and the aimed value thereof. By this method, the stable control can always be executed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the amount of heat input to a sinter, and more particularly to a method for controlling the amount of heat input to a sinter used in the operation of a sinter in the steelmaking industry.

[0002]

2. Description of the Related Art Conventionally, the following method has been known as a method for controlling the amount of heat input to a sintering machine (Japanese Patent Laid-Open No. 60-60).
No. 43441 and Japanese Patent Publication No. 6-39672).
In the method disclosed in JP-A-60-43441,
In the sinter production process, the relationship between the sinter FeO measured by the magnetic substance content measuring device installed after the sinter machine and the input heat amount per unit weight of the sintering raw material was obtained in advance, and the desired level was obtained. The calorific value of the sintering reaction is adjusted by the sinter ore FeO continuously measured so that the strength of the sintered ore approaches the critical heat input. This controls the heat input to the sintering machine. Further, in the method disclosed in Japanese Patent Publication No. 6-39672, the heat output amount is detected from the information obtained from the measurement end installed in the sintering machine, and the difference between the moving average value and the latest value of the detected heat output amount is obtained. , The coke conversion value is obtained based on this difference, and if the values of the closest two or three points of the coke conversion value satisfy the preset condition, the coke mixture ratio is changed by the action amount set according to the condition ( A control system in which this method is considered applicable is shown in FIG. 10). This controls the heat input to the sintering machine.

[0003]

The conventional method for controlling the heat input to the sintering machine, which is disclosed in Japanese Patent Laid-Open No. 60-43441, has the following problems. (1) The magnetic substance content measuring device uses FeO in real time.
Can be measured, but the measurement accuracy is reduced by magnetic substances other than FeO (for example, metallic Fe, MgO, Fe2O3, etc.). Therefore, when the input heat amount is controlled by using this, the fluctuation of FeO becomes large. (2) Since only FeO is set as the control target, the yield fluctuation, which is another important index for the operation of the sintering machine, becomes large. Further, the conventional sintering machine input heat amount control method disclosed in Japanese Patent Publication No. 6-39672 has the following problems. (1) Taking the moving average value of the heat output as a reference value and adjusting the coke mixing ratio to follow this, the fluctuation of the heat output can be reduced, but the heat output is controlled to a certain target value. You cannot do it. (2) Since the amount of heat output cannot be controlled to the target value, the sintered ore FeO, which has a strong correlation with the amount of heat output, cannot be managed within a certain target range. In order to solve the problems in the prior art, the present invention improves the sintering machine charging calorie control method and suppresses fluctuations in FeO and / or yield, and enables stable control at all times. A first object of the present invention is to provide a method for controlling the amount of heat input to a machine. Further, the present invention provides a method for controlling the amount of heat input to a sintering machine, which suppresses fluctuations in the amount of heat output, controls the amount of heat output to its target value, and can always perform stable control by reflecting information about the sintered product. This is the second purpose.

[0004]

In order to achieve the first object, the first aspect of the present invention provides a correlation between the heat output of the raw material charged to the sintering machine and the FeO amount contained in the sintered product. The first relationship is calculated in advance, and the predicted value of the FeO amount is calculated by applying the measured value of the heat output amount to the first relationship, and the calculated predicted value of the FeO amount and its It is configured as a sintering machine input heat amount control method for controlling the input heat amount to the sintering machine based on the deviation from the target value. In the second invention, a second relationship representing the correlation between the heat output of the raw material input to the sintering machine and the yield of the sintered product is obtained in advance, and the measured value of the heat output is the second value. The sintering machine for calculating the predicted value of the yield by applying the above-mentioned relationship to the sintering machine and controlling the amount of heat input to the sintering machine based on the deviation between the calculated predicted value of the yield and its target value. This is a method for controlling the amount of heat input. A third aspect of the present invention is the first relationship showing the correlation between the heat output of the raw material fed to the sintering machine and the amount of FeO contained in the sintered product, and the correlation between the heat output and the yield of the product. A second relationship representing the relationship is obtained in advance, and the predicted values of the FeO amount and the yield are calculated by applying the measured value of the heat output amount to the first and second relationships. Each required heat input amount is calculated based on the deviation between each predicted value of FeO amount and yield and the target value thereof, and is input to the sintering machine based on the weighted sum of each calculated required heat input amount. This is a method for controlling the amount of heat input to a sintering machine for controlling the amount of heat. Furthermore,
The first relationship is represented by the following formula: FeO amount = A1 × heat output + B1 (A1, B1: coefficient), and the coefficient A1, B1 is updated every predetermined period.

Further, the above first relationship is expressed as follows: FeO amount = A1 × heat output + B1 + C1 × heat source auxiliary raw material amount
(A1, B1, C1: coefficient), and the coefficients A1 and B1 are expressed as C
This is a method for controlling the amount of heat input into the sintering machine, which is calculated based on the deviation from the 1 × heat source auxiliary material amount and the actually measured value of the heat output amount. Furthermore, it is a sintering machine input calorie control method in which the second relation is expressed by yield = A2 × heat output + B2 (A2, B2: coefficient), and the coefficients A2 and B2 are updated every predetermined period. Further, the increase / decrease in the input heat amount is calculated as follows: Increase / decrease in the input heat amount = G × [α × (yield target value-yield predicted value) / A1 + (1-α) × (FeO amount target value-FeO amount predicted value) / A2] where A1, A2: coefficient, G: constant, α: variable (0 <
This is a method for controlling the amount of heat input to the sintering machine represented by α <1). Further, the heat output amount is calculated as follows: Heat output amount (kcal / t) = Limestone decomposition heat amount (kcal / t) + Sintered sensible heat amount (kcal / t)
+ Exhaust gas sensible heat amount (kcal / t) Limestone decomposition heat amount (kcal / t) = Limestone amount (kg) x
1000 x limestone decomposition specific heat (kcal / kg) / (product amount + return ore amount) (t) Sintered sensible heat amount (kcal / t) = sintering specific heat (kcal / ° C)
・ Kg) × 1000 × product inlet temperature (° C)
× Temperature correction coefficient Exhaust gas sensible heat (kcal / t) = Exhaust gas specific heat (kcal / t)
℃ ・ Nm ³ ) × Exhaust gas suction blower current amount conversion coefficient (Nm ³ / A ・ min) × 1440 (min) × Exhaust gas suction blower current value (A) × Exhaust gas temperature (° C) / (Product amount This is a method for controlling the amount of heat input to the sintering machine, which is represented by + (return ore amount) (t).

On the other hand, in order to achieve the above-mentioned second object, the fourth aspect of the present invention actually measures the heat output of the raw material fed into the sintering machine and determines the deviation between the measured value of the heat output and its target value. Based on this, the amount of change in the coke distribution ratio in the raw material is calculated, and the amount of heat input to the sintering machine is controlled using the amount of change in the coke distribution ratio.
A fifth aspect of the invention is to actually measure the heat output of the raw material that is put into the sintering machine, and to determine the change amount of the coke distribution ratio in the raw material based on the deviation between the measured value of the heat output and its target value. Calculate,
A sintering machine input heat quantity control method for controlling the input heat quantity of the sintering machine by using the change amount of the coke distribution ratio, and changing the target value based on the information on the sintered product and the heat output quantity. . Furthermore, in changing the above target value,
This is a method for controlling the heat input to the sintering machine, which uses a regression equation of information on the sintered product and the heat output. Further, when the information on the sintered product obtained by substituting the target value into the regression equation is out of the allowable range, the calorie input heat quantity for changing the target value by a predetermined amount It is a control method. Further, it is a method for controlling the amount of heat input to the sintering machine, which changes the predetermined amount according to the degree of deviation from the allowable range.
Furthermore, it is a method for controlling the amount of heat input to the sintering machine in which the information on the sintered product is the amount of FeO. Furthermore, it is a method for controlling the amount of heat input to the sintering machine, in which the information on the sintered product is the yield.

[0007]

According to the first to third inventions, the first relationship and / or the above-mentioned heat output amount showing the correlation between the heat output amount of the raw material charged to the sintering machine and the FeO amount contained in the sintered product. And a second relationship representing the correlation between the product yield and
The predicted value of the FeO amount and / or the yield is calculated by applying the measured value of the heat output amount to the first relationship and / or the second relationship. FeO amount calculated above and /
Alternatively, the amount of heat input to the sintering machine is controlled based on the deviation between the predicted yield value and its target value. Here, when both predicted values of the FeO amount and the yield are used, each required heat input amount is calculated on the basis of the deviation, and the sintering machine is fed to the sintering machine based on the weighted sum of the calculated required heat input amounts. The amount of heat input is controlled. Therefore, unlike the conventional example, the magnetic substance content measuring device is not used, and the FeO amount is obtained from the relational expression of the heat output amount which has a strong correlation with the analyzed FeO amount.
Moreover, since the heat output is obtained in real time, F in real time
The eO amount can be calculated.

When the predicted values of both the FeO amount and the yield are used, the input heat amount is determined by the weighted sum of the deviations between the target values and the calculated values. Different operational policies can be reflected in heat control. Further, since the relational expression between the FeO amount and the heat output amount and / or the relational expression between the yield and the heat output amount is obtained at any time, the calculation accuracy of the FeO amount and / or the yield is good, and therefore stable control is always performed. You can do it. Furthermore, by considering the change in the FeO amount due to the heat source auxiliary raw material, the FeO amount can be immediately and accurately predicted even if the auxiliary raw material mixing ratio in the input heat amount changes. Therefore, in this case, more stable control can be performed.
As a result, it is possible to obtain a method for controlling the heat input to the sintering machine, which can suppress the fluctuation of the FeO amount and / or the fluctuation of the yield and can always perform stable control. On the other hand, according to the fourth aspect of the invention, the heat output of the raw material to be fed into the sintering machine is measured, and the coke distribution ratio in the raw material is changed based on the deviation between the measured value of the heat output and its target value. The amount of heat is calculated, and the amount of heat input to the sintering machine is controlled using the amount of change in the coke distribution ratio. Therefore, the amount of heat output can be controlled to the target value while suppressing the variation in the amount of heat output.

According to the fifth invention, the control according to the fourth invention is performed, and the target value is changed based on the information on the sintered product and the heat output. Therefore, in this case, information about the sintered product can be reflected in the control of the heat output. Furthermore, in changing the above target value,
If the regression equation of the information on the sintered product and the heat output is used, the information on the sintered product can be more reliably reflected in the control of the heat output. Further, when the information about the sintered product obtained by substituting the target value into the regression equation is out of the allowable range, the target value is changed by a predetermined amount. As a result, the heat output can be controlled so that the information on the sintered product is always within the allowable range. further,
If the predetermined amount is changed according to the degree of deviation from the permissible range, the control operation can be quickly converged. Further, when the information about the sintered product is the FeO amount or the yield, the FeO amount or the yield can be reflected in the control of the heat output. As a result, it is possible to suppress the fluctuation of the heat output amount and control the heat output amount to the target value, and to always perform stable control by reflecting the information about the sintered product.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the accompanying drawings for the understanding of the present invention. The following embodiments are examples of embodying the present invention and are not intended to limit the technical scope of the present invention. Here, FIG. 1 is a diagram showing a schematic flow of a method for controlling heat input to a sintering machine according to an embodiment (first embodiment) of the first to third inventions, and FIG. 2 is a process flow of a sintering factory. The schematic diagram shown in FIG. 3, FIG. 3 is an explanatory diagram showing the relationship between the heat output amount and the FeO amount, FIG. 4 is an explanatory diagram showing the change in the FeO amount due to changes in the auxiliary materials, and FIG. 5 is an explanatory diagram showing the method for determining the scale correction term. FIG. 6 is a diagram showing a schematic flow of a calorie input heat amount control method according to one embodiment (second embodiment) of the fourth and fifth inventions, and FIG. 7 is applicable to the second embodiment method. 8 is a block diagram of the control system, FIG. 8 is a flow chart showing the operation of the control system, and FIG. 9 is an explanatory diagram showing the control state of the control system. As shown in FIG. 1 and FIG. 2, the sintering machine input heat quantity control method according to one embodiment (first embodiment) of the first to third inventions is a method for supplying the raw material 2 to the sintering machine 1. The first relationship showing the correlation between the amount of heat and the amount of FeO contained in the sintered product 3 and / or the amount of heat output and the product 3
The second relationship representing the correlation with the yield of the above is obtained in advance (S1), and the measured value of the heat output amount is set to the first relationship and / or
Alternatively, by applying the second relation, the predicted value of the FeO amount and / or the yield is calculated (S2), and the deviation between the calculated FeO amount and / or the predicted value of the yield and its target value is calculated. The amount of heat input to the sintering machine 1 is controlled based on (S3)
It is configured as follows.

Here, in the above step S3, Fe
When both the predicted values of the O amount and the yield are used, the required heat input amount is calculated based on the deviation (S3a), and the sintering machine 1 is calculated based on the weighted sum of the calculated required heat input amount. The amount of heat input to the device is controlled (S3b). FIG. 2 shows a flow of the sintering process 10. In the figure, the raw material 2 is appropriately mixed and stored in the raw material tank 11 and then cut out by the quantitative cutout device 12.
The raw material 2 cut out is granulated by the primary and secondary drum mixers 13 and fed to the sintering machine 1. The supplied raw material 2 is ignited and fired here to obtain a product 3. The exhaust gas at the time of firing is sucked by the suction blower 14 through the electric dust collector (EP) 13, and then discharged into the atmosphere through the flue gas desulfurization facility 15. The baked product 3 is sent to the cooler 17 via the primary crusher 16 and cooled there. Exhaust heat from the cooler 17 is recovered and effectively utilized by the exhaust heat recovery boiler 18. The cooled product 3 is sized by the secondary crusher 19 and then screened by the screen 20, and the returned ore 21 is returned to the raw material tank 11 for reuse. The screened product 3 is sent to the blast furnace as the final product after sampling inspection by the automatic sampling equipment 22. This sintering process 10 is controlled by the control device 23.
Controlled by. That is, the method of the first embodiment is implemented by the controller 23.

The procedure of controlling the heat input to the sintering machine by the control device 23 will be described below. However, here, a case will be described in which the predicted values of both the FeO amount and the yield are used in the method of the first embodiment. When either of the two is used, only the relevant process needs to be performed, and therefore the description thereof is omitted here. First, limestone (corresponding to the raw material) amount, production amount (corresponding to the product amount), return ore amount, cooler (corresponding to the cooler) inlet temperature, blower as data for calculating the amount of analyzed FeO, yield and heat output. The current value and the EP temperature (corresponding to the exhaust gas temperature) are stored in the memory 24 of the control device 23 together with the time data. Next, the heat output amount at each time is calculated by the following formula, and is similarly stored in the memory 24. The following series of calculations are executed by the calculator 25 of the controller 23. Heat output (kcal / t) = Limestone decomposition heat quantity (kcal / t) + Sintered sensible heat quantity (kcal / t) + Exhaust gas sensible heat quantity (kcal / t) Limestone decomposition heat quantity (kcal / t) = Limestone quantity (kg) × 1000 × Decomposition of limestone Specific heat (kcal / kg) / (Production amount + Returned mineral amount) (t) Sintered sensible heat amount (kcal / t) = Sintering specific heat (kcal / ° C. kg) × 1000 × Cooler inlet temperature ( ℃) × cooler temperature correction coefficient Exhaust gas sensible heat (kcal / t) = Exhaust gas specific heat (kcal / ℃ · Nm ³ ) × blower current flow rate conversion coefficient (Nm ³ / A · min) × 1440 (min) × blower current value ( A) x EP temperature (° C) / (production + return ore) (t) (1)

Next, the accumulated data is averaged for a certain time (for example, about 1 to 24 hours). Based on the averaged data, the least squares method is used to obtain the coefficients A1, A2, B1, B2 in the respective equations indicating the following first and second relationships stored in advance in the memory 24. First relation: FeO amount = A1 × heat output + B1 Second relation: Yield = A2 × heat output + B2 (2) At this time, the FeO amount and the heat output, or the yield and the heat output are The calculation is performed by shifting the time, for example, 0 to 6 hours. FIG. 3 shows the relationship between the amount of FeO and the amount of heat output by the coefficients A1 and B1 thus obtained. Also, the coefficient A2
The same holds true for the relationship between the yield and the amount of heat output according to B2 (up to this point corresponds to step S1 in the above method). Next, data for calculating the heat output is collected at a certain cycle.
Then, this data is also subjected to the averaging process at the same time as the above averaging process. Then, the amount of heat output is calculated and stored in the memory 24. The FeO amount and the yield determined by the above equation (2) are predicted (corresponding to step S2 in the above method).

Using these predicted values, the increase / decrease amount of the amount of heat input is determined by the following equation, and the control unit 26 of the controller 23 issues a command signal to the quantitative cutting device 12 and the like to input the amount of heat input to the sintering machine 1. (Corresponding to steps S3a and S3b in the above method). Increase / decrease in input heat amount = G × [α × (yield target value−yield predicted value) / A1 + (1-α) × (FeO target value−FeO predicted value) / A2] (3) where α Is a variable of 0 to 1, and G is a coefficient. After a certain period of time, or when the prediction accuracy of the FeO amount and the yield deteriorates, the coefficients A1, A2, B in the above equation (2)
1 and B2 are updated. Otherwise, the data is collected for calculating the heat output, and the above processing is repeated in sequence. From the above, the following can be said. (1) In the first embodiment, unlike the conventional example, the magnetic substance content measuring device is not used, and the FeO amount is obtained from the relational expression of the heat output amount having a strong correlation with the analyzed FeO amount. Moreover, since the heat output is obtained in real time, the FeO amount in real time can be calculated.

(2) When the predicted values of both the FeO amount and the yield are used, the input heat amount is determined by the weighted sum of the deviations between the target values and the calculated values. Operation policy can be reflected in heat quantity control. (3) Since the relational expression between the FeO amount and the heat output amount and / or the relational expression between the yield and the heat output amount is obtained at any time, the calculation accuracy of the FeO amount and / or the yield is good, and therefore stable control is always possible. You can do it. Further, since all the above relational expressions are linear expressions, the relational expressions can be obtained at high speed. Furthermore, even if there is a dead time in the relationship between the amount of heat output and the amount of FeO and / or the yield, it can be controlled accurately. As a result, it is possible to suppress the fluctuation of the FeO amount and / or the fluctuation of the yield and always perform stable control. By the way, in the above-mentioned first embodiment, when the raw material mixture ratio in the input heat source changes, as shown in FIG. Differences may occur.
This is the amount of FeO in the heat source auxiliary raw material and FeO in the heat source main raw material.
This is because there is a difference from the quantity. Therefore, it is considered that the prediction formula (first relationship) of the FeO amount in the above formula (2) is changed to the following formula. FeO amount = A1 × heat output + B1 + C1 × heat source auxiliary raw material amount (2 ′) where C1 is a change coefficient of the FeO amount depending on the heat source auxiliary raw material amount.

Here, the scale which is the heat source auxiliary material amount is 0.
FIG. 5 shows the relationship between the amount of FeO and the amount of heat output when the content is changed up to 4%. In this case, the FeO amount changes by 0.25% when the scale changes by 2%, and the coefficient of change C1 of the FeO amount due to the heat source auxiliary raw material amount is set to 0.125, and by introducing it into the above equation (2 '), Before learning the coefficients A1 and B1, the level difference between the predicted value and the actual value can be eliminated as shown in FIG. However, since the actual value of the FeO amount includes the influence of the auxiliary raw material mixture ratio in the input heat source, the coefficients A1 and B1 are (FeO amount actual value-C1
X Heat source auxiliary material amount and heat output amount actual value). In this way, by introducing the coefficient of change of the FeO amount due to the heat source auxiliary raw material into the FeO amount prediction equation having the above-mentioned first relation, even if the mixing ratio of the auxiliary raw material in the input heat amount changes, the FeO amount can be accurately measured immediately. The quantity can be predicted. As a result, more stable control can be performed as compared with the first embodiment.
The first embodiment does not particularly mention the fluctuation of the heat output.

However, since the amount of heat output is closely related to the quality of the product, it is desirable to suppress the fluctuation of the amount of heat output by giving a target value to the product for control.
The fourth and fifth inventions have been made in view of this point and will be described below. As shown in FIGS. 2 and 6, the sintering machine charging heat quantity control method according to one embodiment (second embodiment) of the fourth and fifth inventions is such that the raw material 2 supplied to the sintering machine 1 is discharged. The amount of heat is measured (S11), the amount of change in the coke mixing ratio in the raw material 2 is calculated based on the deviation between the measured value of the amount of heat output and its target value (S12), and the amount of change in the coke is used. The amount of heat input to the sintering machine 1 is controlled (S13) (up to this point is the fourth invention), and the target value is changed based on the information regarding the sintered product 3 and the amount of heat output (S14) (first). 5
Invention)). The second embodiment method is embodied by the controller 23 'in FIG. 2 (FIG. 7).
Is a block diagram showing a control system including the control device 23 ').

The procedure for controlling the heat input to the sintering machine by the control device 23 'will be described below with reference to FIG. In FIG. 8, first, the initial value of the target value of the heat output amount and the upper and lower limit values for changing the target value of the heat output amount (corresponding to the permissible range) are set to FeO or the product yield (both correspond to information on the sintered product). ) Inside the target management range of
It is stored in the memory 24 'of the controller 23' (S21).
Next, as data for calculating the analytical FeO value, yield and heat output, the amount of limestone, the amount of production, the amount of returned ore, the cooler inlet temperature, the blower current, and the EP temperature are stored in the memory 24 'together with the time data ( S22). Next, the heat output at each time is calculated using the above equation (1), and the memory 2
The data is stored in 4 '(S23) (this corresponds to step S11 in FIG. 6). In addition, the following series of calculation is performed by the controller 2
This is executed by the operation unit 25 'of 3'. Next, the average value process is performed on the accumulated data every certain time (for example, about 1 to 6 hours) (S24). Next, using n averaged data (for example, for about 12 to 24 hours), a minimum of 2
By the multiplication method, the coefficient A1, of the equation (2) which is also a regression equation,
B1 or A2 and B2 are obtained (S25). At this time, F
The eO and the heat output, or the yield and the heat output are calculated by shifting for a certain time (for example, about 0 to 6 hours).

Next, the target value of the heat output is substituted into the above equation (2) to calculate the calculated target value of FeO or yield (S).
26). Next, it is determined whether or not it is the heat output target change timing (S27). The heat output target change timing refers to whether or not a certain time has passed since the previous heat output target change. If it is the heat output target change timing, the following steps are sequentially executed, and if not, skip to step S31. Next, the calculation target value of FeO or yield is compared with the preset upper and lower limit values for changing the heat output amount target value (S28). If the calculation target value exceeds the upper limit value, the heat output amount target value is set. The amount is decreased by a preset amount (corresponding to a predetermined amount) (S29). If the calculated target value is below the lower limit, the target value of the heat output is increased by a preset amount (S30) (steps S24 to S30).
Corresponds to step S14 in FIG. 6). The preset amount may be a fixed value, or may be changed according to the degree of deviation of the calculation target value from the upper limit value. next,
The target value of the heat output and the latest actual heat output are compared, and the input / output heat increase / decrease amount (corresponding to the change amount of the coke distribution ratio) is determined according to the difference (S31) (step S in FIG. 6).
12). Increase / decrease amount of input heat amount = G ′ × (target value of heat output amount−actual value of heat output amount) Here, G ′ is a coefficient.

Next, it is determined whether it is the action timing (S32). Action timing refers to whether or not a certain amount of time has passed since the last action. If it is action timing, execute the next step,
Otherwise, take no action. Step S above
The input heat amount increase / decrease amount determined at 31 is changed, or a threshold value is set for the input heat amount increase / decrease amount, and when the threshold value is exceeded, the input heat amount is increased / decreased by a preset amount (S33). The threshold value may be set in multiple stages, and the amount of heat input may be increased or decreased by an amount corresponding to the threshold value. Specifically, the control unit 26 'of the control device 23' controls the amount of heat input to the sintering machine 1 by issuing a command signal to the quantitative cutout device 12 or the like (steps S32 and S33 correspond to step S in FIG. 6).
13). The above steps S22 to S33 are repeated at a certain control cycle.

FIG. 9 shows an example in which the amount of heat input is controlled by the method of the second embodiment. In FIG. 9, since the FeO calculation target value exceeds the target change upper limit at time A, the heat output target value decreases. Further, at time B, the FeO calculation target value falls below the target change lower limit, so the heat output target value increases. The actual FeO value is controlled within the control upper and lower values by increasing or decreasing the input heat amount in proportion to the difference between the FeO calculation target value and the actual heat output amount value. Further, the actual heat output amount follows the target value by increasing or decreasing the input heat amount according to the difference between the target heat output amount value and the actual heat output amount value. still,
Similar control can be performed on the product yield.
From the above, the following can be said. (1) Since the coke mixing ratio is adjusted based on the deviation between the target value and the actual value of the heat output amount, it is possible to suppress the fluctuation of the heat output amount and control the heat output amount to the target value. (2) Since the target value of the heat output amount is changed so that the FeO amount or the yield is within the target range, the FeO amount or the yield (information about the product) can be managed within the target range. In other words, information about sintered products can be reflected in the control of heat output.

Further, in the change of the above target value, if the regression equation of the information on the sintered product and the heat output is used,
Information about sintered products can be reflected more reliably in the control of heat output. Further, when the information about the sintered product obtained by substituting the target value into the regression equation is out of the allowable range, the target value is changed by a predetermined amount. As a result, the heat output can be controlled so that the information on the sintered product is always within the allowable range. Further, if the predetermined amount is changed according to the degree of deviation from the permissible range, the control operation can be quickly converged. As a result, it is possible to suppress the fluctuation of the heat output amount and control the heat output amount to the target value, and to always perform stable control by reflecting the information about the sintered product.

[0023]

Since the method for controlling the calorific value of the sintering machine according to the first to third aspects of the present invention is configured as described above, it is not necessary to use the magnetic substance content measuring device as in the conventional example, and the analytical Fe is analyzed.
Since the FeO amount is obtained from the relational expression of the heat output amount having a strong correlation with the O amount, the calculation accuracy of the FeO amount is good, and the heat output amount is obtained in real time, so the FeO amount can be calculated in real time. Further, when using the predicted values of both the FeO amount and the yield, the input heat amount is determined by the weighted sum of the deviations between the target values and the calculated values, so the operation policy such as FeO amount priority or yield priority Can be reflected in heat quantity control. Further, since the relational expression between the FeO amount and the heat output amount and / or the relational expression between the yield and the heat output amount is obtained at any time, the calculation accuracy of the FeO amount and / or the yield is good, and therefore stable control is always performed. You can do it. Furthermore, by considering the change in the FeO amount due to the heat source auxiliary raw material, the FeO amount can be immediately and accurately predicted even if the auxiliary raw material mixing ratio in the input heat amount changes.
Therefore, in this case, more stable control can be performed. As a result, it is possible to obtain a method for controlling the heat input to the sintering machine, which can suppress the fluctuation of the FeO amount and / or the fluctuation of the yield and can always perform stable control.

On the other hand, in the sintering machine input heat quantity control method according to the fourth aspect of the invention, since the coke mixing ratio is adjusted based on the deviation between the target value and the actual value of the heat output quantity, the fluctuation of the heat output quantity is suppressed, The amount of heat output can be controlled to the target value. In the sintering machine input heat quantity control method according to the fifth aspect of the invention, the relationship between the FeO quantity or the yield and the heat output quantity is always identified, and the target of the heat output quantity is controlled so that the FeO quantity or the yield quantity is within the target range. Since the value is changed, the FeO amount or yield (information about products)
Can be managed within the target range. In other words, information about sintered products can be reflected in the control of heat output. Further, when the target value is changed, if the regression equation of the information on the sintered product and the heat output is used, the information on the sintered product can be more reliably reflected in the control of the heat output. Further, when the information about the sintered product obtained by substituting the target value into the regression equation is out of the allowable range, the target value is changed by a predetermined amount. As a result, the heat output can be controlled so that the information on the sintered product is always within the allowable range. Further, if the predetermined amount is changed according to the degree of deviation from the permissible range, the control operation can be quickly converged. As a result, it is possible to suppress the fluctuation of the heat output amount and control the heat output amount to the target value, and to always perform stable control by reflecting the information about the sintered product.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic flow of a method for controlling heat input into a sintering machine according to an embodiment (first embodiment) of first to third inventions.

FIG. 2 is a schematic diagram showing a process flow of a sintering factory.

FIG. 3 is an explanatory diagram showing the relationship between the amount of heat output and the amount of FeO.

FIG. 4 is an explanatory diagram showing changes in the amount of FeO with changes in auxiliary raw materials.

FIG. 5 is an explanatory diagram showing a method of determining a scale correction term.

FIG. 6 is a diagram showing a schematic flow of a method for controlling a calorific value of a sintering machine according to an embodiment (second embodiment) of fourth and fifth inventions.

FIG. 7 is a block diagram of a control system to which the method of the second embodiment can be applied.

FIG. 8 is a flowchart showing the operation of the control system.

FIG. 9 is an explanatory diagram showing a control state by the control system.

FIG. 10 is a block diagram of a control system which is considered to be applicable to the conventional sintering machine input heat amount control method disclosed in Japanese Patent Publication No. 6-39672.

[Explanation of symbols]

 1 ... Sintering machine 2 ... Raw material 3 ... Product

Claims (15)

[Claims] 1. A first relationship representing the correlation between the heat output of the raw material fed to the sintering machine and the FeO content of the sintered product is obtained in advance, and the measured value of the heat output is calculated as The calculated value of the FeO amount is calculated by applying the relationship of No. 1 and the calcining for controlling the amount of heat input to the sintering machine based on the deviation between the calculated predicted value of the FeO amount and its target value. How to control the amount of heat input to the machine. 2. A second relationship representing the correlation between the heat output of the raw material input to the sintering machine and the yield of the sintered product is obtained in advance, and the measured value of the heat output is the second relationship. The amount of heat input to the sintering machine is calculated based on the deviation between the calculated predicted value of the yield and the target value. Control method. 3. A first relationship showing the correlation between the heat output of the raw material fed into the sintering machine and the FeO amount contained in the sintered product and the correlation between the heat output and the yield of the product. The second relationship represented is obtained in advance, and the predicted values of the FeO amount and the yield are calculated by applying the measured value of the heat output amount to the first and second relationships, and the calculated FeO value is calculated. The required heat input is calculated based on the deviation between each predicted value of the amount and yield and their target values, and the heat input to the sintering machine is calculated based on the weighted sum of the calculated required heat input. Controlling the amount of heat input to the sintering machine. 4. The calcination according to claim 1 or 3, wherein the first relationship is expressed as FeO amount = A1 × heat output + B1 (A1, B1: coefficient), and the coefficients A1, B1 are updated every predetermined period. How to control the amount of heat input to the machine. 5. The amount of FeO = A1 × heat output + B1 + C1 × heat source auxiliary raw material amount
(A1, B1, C1: coefficient), and the coefficients A1 and B1 are expressed as C
4. The method for controlling the calorific value of the sintering machine input according to claim 1, wherein the calorific value is calculated based on a deviation from 1 * heat source auxiliary material amount and an actually measured value of the heat output amount. 6. The firing according to claim 2, wherein the second relationship is expressed by yield = A2 × heat output + B2 (A2, B2: coefficient), and the coefficients A2, B2 are updated at predetermined intervals. How to control the amount of heat input to the machine. 7. The increase / decrease in the input heat amount is the increase / decrease in the input heat amount = G × [α × (target yield value-predicted yield value) / A1 + (1-α) × (FeO amount target value-FeO amount prediction Value) / A2] where A1, A2: coefficient, G: constant, α: variable (0 <
The method for controlling calorific value input to the sintering machine according to claim 3, wherein α <1). 8. The heat output amount is calculated as follows: heat output amount (kcal / t) = limestone decomposition heat amount (kcal / t)
t) + amount of sensible heat of sintering (kcal / t) + amount of sensible heat of exhaust gas (k
cal / t) Calorific value of limestone decomposition (kcal / t) = Limestone amount (kg) x
1000 x limestone decomposition specific heat (kcal / kg) / (product amount + return ore amount) (t) Sintered sensible heat amount (kcal / t) = sintering specific heat (kcal / ° C)
・ Kg) × 1000 × product inlet temperature (° C)
× Temperature correction coefficient Exhaust gas sensible heat (kcal / t) = Exhaust gas specific heat (kcal / t)
℃ ・ Nm ³ ) × Exhaust gas suction blower current amount conversion coefficient (Nm ³ / A ・ min) × 1440 (min) × Exhaust gas suction blower current value (A) × Exhaust gas temperature (° C) / (Product amount + Amount of returned ore) (t) The method for controlling the calorific value of the sintering machine according to any one of claims 1 to 6. 9. The amount of heat output of the raw material fed into the sintering machine is measured, and the change amount of the coke distribution ratio in the raw material is calculated based on the deviation between the measured value of the amount of heat output and its target value. A method for controlling the amount of heat input to a sintering machine, wherein the amount of heat input to the sintering machine is controlled using the amount of change in the coke distribution ratio. 10. The amount of heat output of the raw material fed into the sintering machine is measured, and the change amount of the coke distribution ratio in the raw material is calculated based on the deviation between the measured value of the amount of heat output and its target value. A method for controlling the amount of heat input to a sintering machine, which controls the amount of heat input to the sintering machine by using the amount of change in the coke distribution ratio, and changes the target value based on the information about the sintered product and the amount of heat output. 11. A regression equation of information about a sintered product and the amount of heat output is used to change the target value.
The method for controlling the amount of heat input to the sintering machine according to 0. 12. The target value is changed by a predetermined amount when the information about the sintered product obtained by substituting the target value into the regression equation is out of the allowable range. The method for controlling heat input into a sintering machine as described. 13. The method for controlling the amount of heat input to a sintering machine according to claim 12, wherein the predetermined amount is changed according to the degree of deviation from the allowable range. 14. The method for controlling the amount of heat input to a sintering machine according to claim 10, wherein the information on the sintered product is the amount of FeO. 15. The method for controlling the calorific value of a sintering machine according to claim 10, wherein the information on the sintered product is a yield.