CN105241248A - Sintering-end-point double-boundary compensation control method with front end point and back end point of combustion zone bottom contact section as boundaries - Google Patents
Sintering-end-point double-boundary compensation control method with front end point and back end point of combustion zone bottom contact section as boundaries Download PDFInfo
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Abstract
The invention relates to a sintering-end-point double-boundary compensation control method with a front end point and a back end point of a combustion zone bottom contact section as boundaries. The method includes the steps that a quadratic curve is fitted with the temperature of two air bellows at the front control boundary position and the back control boundary position as base points, and the temperature value of a point where the quadratic curve and the front control boundary position are interacted serves as a predicated value; the temperature of an air bellow at the front adjustment boundary position is adjusted according to the predicted value by changing the air pressure of a main exhaust fan, and the temperature of an air bellow at the back adjustment boundary position is adjusted according to a difference value result between a temperature measured value and a set value by changing the speed of a combustion engine; and the deviation values between temperature measured values of the air bellows at the front adjustment boundary position and the back adjustment boundary position and the set value serve as parameter change factors for adjusting power, a function relation between the adjusting power and the deviation values between the temperature measured values and the set value is fitted through a neural network system, and the sintering end points can be controlled. By means of the method, the predicting accuracy of the sintering end points can be improved, and the adjusting oscillation performance of the sintering end points can be reduced.
Description
Technical field
The present invention relates to a kind of sintering indice method, specifically combustion zone touches the sintering end point bilateral boundary compensating control method that end points before and after end section is border, belongs to sintering process automation field.
Background technology
Accurate forecast sintering end point position is the basic demand of modern SINTERING PRODUCTION, to raising sintering machine output and guarantee that sinter quality tool is of great significance, realize SINTERING PRODUCTION and the good accuracy of harmony to sintering end point of cogeneration two process also been proposed higher requirement.But because sintering end point influence factor is many and complicated, cause current actual sintered production process be difficult to realize the accurate forecast of sintering end point and accurately regulate, this causes very large puzzlement to two process coordinatings.
Known prediction of burn through point and control methods, first any two bellows sintered discharge gas temperature after end point is touched in mensuration sinter bed preheating zone, the standard conic section of sintered discharge gas temperature is gone out again, with the position corresponding to conic section peak point for sintering end point position carries out regulating and controlling according to two bellows EGT coordinate fittings.The essence of known prediction of burn through point and control methods is position corresponding to forecast conic section peak point and adjusted, belongs to monolateral boundary sintering indice method.There is following shortcoming in known sintering end point monolateral boundary sintering indice method:
1) there is relatively large deviation in the concept of sintering end point, causes forecast precision low
As everyone knows, known monolateral boundary sintering indice method is is sintering end point with the position corresponding to matching conic section peak point, in fact, real sintering end point is not conic section peak point, but the complete sintering machine position corresponding to that of combustion zone reaction, namely combustion zone touches the aft terminal of end section, and the two has diverse physical significance.So there is internal difference, with conic section peak point for control objectives can cause forecast precision lowly and often cause regulating to have very large concussion with conic section peak point for control objectives and combustion zone touch end section aft terminal for control objectives.
2) matching conic section peak point generally can depart from the mid point that sintering belt touches end section
Known sintering indice method thinks that matching conic section peak point generally can overlap with the mid point that sintering belt touches end section, but because sintering reaction is very complicated, there is very big difference in matching conic section and actual temperature rise curve, in most cases, matching conic section peak point can depart from the mid point that sintering belt touches end section, so known sintering indice method forecast accuracy is very low, even often there is the mistake of directionality, finally cause the result that large amplitude vibration regulates.
3) regulate difficulty large
Known prediction of burn through point method forecast precision is poor, all there is uncertainty to the forecast of sintering end point change direction and variable quantity, so cause the adjustment instructed by known prediction of burn through point method to have the feature of large amplitude, long-time vibration, thus bring very large difficulty to the automatic adjustment of sintering machine.
A large amount of SINTERING PRODUCTION practice shows, really there is very large defect in known prediction of burn through point method, be difficult to meet the requirement that modern large SINTERING PRODUCTION regulates sintering end point automatically, need the forecasting mode thoroughly changing existing sintering end point, improve forecasting model, fundamentally improve accuracy of the forecast, significantly reduce the concussion that sintering machine regulates.
Summary of the invention
The object of the invention is to provide a kind of combustion zone and touches the sintering end point bilateral boundary compensating control method that end points before and after end section is border, can improve the accuracy of prediction of burn through point, and reduces the concussion of sintering end point adjustment.
To achieve these goals, the present invention adopts following technical scheme:
Combustion zone touches the sintering end point bilateral boundary compensating control method that end points before and after end section is border, comprises the following steps:
1) sintering machine underlying parameter, front control boundary position, rear control boundary position, front adjustment boundary position and rear adjustment boundary position is determined;
2) when determining normally to produce, the temperature values of position, front adjustment border bellows and the temperature values of position, rear adjustment border bellows;
3) temperature of front control boundary position and rear control boundary position two bellows is basic point matching conic section, and the temperature value of conic section and front control boundary position joining is as predicted value;
4) blast that the temperature of position, front adjustment border bellows is worth according to weather report by changing main exhauster adjusts, and the temperature of position, rear adjustment border bellows adjusts by changing combustor machine speed according to the difference result of temperature measured value and setting value;
5) using the deviate of front adjustment boundary position and rear adjustment border position box temperature measured value and setting value as the ginseng variable factor regulating power, and can be controlled sintering end point regulating the difference functions correlation of power and temperature measured value and setting value to carry out matching by nerve network system.
Adopt the present invention of technique scheme, compared with prior art, its beneficial effect is:
1) using the way of vertex of a conic as sintering end point before have modified, it is Forecasting Object that combustion zone to touch under bottom starting point and combustion zone along arriving stoker surface corresponding points, it is sintering end point that combustion zone touches edge arrival stoker surface corresponding points on bottom terminal and combustion zone, the position of more realistic middle sintering end point;
2) forecast precision is high, because Forecasting Object of the present invention is in the low slope variation rate section (degree of fitting of pure preheating section is very high) of secondary line, so forecast precision is very high;
3) regulate concussion property little, because forecast precision of the present invention is high, and take preconditioning to regulate with emergent the compensatory control scheme combined, so regulate concussion property significantly to reduce;
4) power function is regulated can to realize science matching, the present invention regulates the ginseng variable factor of power to be the temperature approach regulating boundary observed temperature and design temperature, compared with the position deviation value of known monolateral boundary sintering indice method, regulate between power and temperature deviation value and can set up mathematical, and can utilize neutral net from actual production data, obtain more accurate automatic regulation moving force function;
5) easily realize automation to regulate, due to more accurate automatic regulation moving force function can be obtained, so than being easier to the Automated condtrol realizing sintering end point.
As preferably, the present invention further technical scheme is:
Front control boundary position is that combustion zone touches starting point bellows position, bottom, and rear control boundary position is the position that combustion zone touches terminal bellows position, bottom and sintering end point.
Front adjustment boundary position is that combustion zone touches the previous bellows position of bottom starting point, and rear adjustment boundary position is that combustion zone touches a bellows position after the terminal of bottom.
Lower than the lower limit of normal range (NR), namely the predicted value of front adjustment boundary position thinks that appearance postpones by sintering end point position, start sintering end point position and postpone preconditioning pattern; Higher than the upper limit of normal range (NR), namely the predicted value on front adjustment border thinks that sintering end point position by appearance in advance, start sintering end point position and shift to an earlier date preconditioning pattern;
Front border postpones preconditioning power F=ψ (before t-t24);
Front border shifts to an earlier date preconditioning power F=ψ (t poor-Δ t) or F=ψ (t24-t1),
The incidence coefficient that wherein ψ, Φ-need is obtained by creation data matching;
Before t-be front adjusting position box temperature minimum of a value;
T is poor-and be the minimum of a value of the temperature gap of front adjusting position and front control boundary position bellows;
T24-be respectively front adjusting position box temperature measured value;
The difference of Δ t-temperature measured value and setting value;
T1-is front adjusting position box temperature maximum.
Lower than the lower limit of normal range (NR), namely the predicted value on rear adjustment border thinks that sintering end point position has occurred in advance, start sintering end point position emergent shaping modes in advance, higher than the upper limit of normal range (NR), namely the predicted value on front adjustment border thinks that postponing has appearred in sintering end point position, start sintering end point position and postpone emergent shaping modes;
Rear border postpones to regulate power F=Φ (poor after t-Δ t) or F=Φ (t28-t2);
Rear border regulates power F=Φ (after t-t28) in advance;
In formula,
ψ, Φ-need by creation data matching obtain incidence coefficient;
After t-be rear adjusting position box temperature minimum of a value;
Poor after t-be the minimum of a value of the temperature gap of rear adjusting position and rear control boundary position bellows;
T28-be rear adjusting position box temperature measured value;
The difference of Δ t-temperature measured value and setting value;
T2-is rear adjusting position box temperature maximum.
Accompanying drawing explanation
Fig. 1 is control border of the present invention and regulates border position description figure;
In Fig. 1: curve is sintering temperature curve, when sintering end point is normal, 24, temperature spot A point corresponding to 27 bellows, B point are the two-end-point of peak line segment, so A point, B point position be respectively before and after after control border, position C point temperature corresponding to the previous bellows of A point is front conciliation border, and the position D point temperature corresponding to the rear bellows of B point is rear adjustment border.
Fig. 2 is forward and backward control border of the present invention, adjustment border, front and back prediction curve figure;
In Fig. 2: 19,20,21 3 box temperature are measured value, the conic section that the later temperature of 22 bellows is basic point matching with 19,20,21 3 box temperature, forecast result is as follows:
(1) judgement that whether offsets of front control border
24 box temperature are 368 DEG C, and front control border does not shift to an earlier date, and does not postpone yet;
Between 24 bellows and 25 bellows, the temperature difference is 35 DEG C, and front control border does not shift to an earlier date;
(2) judgement whether border offsets is controlled afterwards
Between 27 bellows and 28 bellows, the temperature difference is 53 DEG C, is greater than 40 DEG C, and rear border is postponed, and needs to regulate.
Detailed description of the invention
To do the present invention below in conjunction with embodiment and describe clearly and completely further, described embodiment is only the present invention's part embodiment, instead of whole embodiments.
Combustion zone touches the sintering end point bilateral boundary compensating control method that end points before and after end section is border, comprises the following steps:
1) sintering machine underlying parameter, front control boundary position, rear control boundary position, front adjustment boundary position and rear adjustment boundary position is determined, controlling boundary position is wherein that combustion zone touches starting point bellows position, bottom, rear control boundary position is the position that combustion zone touches terminal bellows position, bottom and sintering end point, front adjustment boundary position is that combustion zone touches the previous bellows position of bottom starting point, and rear adjustment boundary position is that combustion zone touches a bellows position after the terminal of bottom;
In the present embodiment:
A, sintering machine underlying parameter
Sintering machine area: 265m
2
Sintering machine wind box number: each 28 of left and right
B, control boundary position
Front control boundary position: 25 bellows
Rear control boundary position: 27 bellows
C, adjustment boundary position
Front adjustment boundary position: 24 bellows
Rear adjustment boundary position: 28 bellows
2) when determining normally to produce, the temperature values of position, front adjustment border bellows and the temperature values of position, rear adjustment border bellows
In the present embodiment, the temperature values of front adjustment boundary bellows:
The adjustment target that a, front border shift to an earlier date
Between (1) 24 bellows and 25 bellows, the temperature difference is greater than 45 DEG C;
(2) 24 box temperature are lower than 365 DEG C.
The adjustment target that b, front border are postponed
24 box temperature are lower than 260 DEG C.
The temperature values of position, rear adjustment border bellows
The adjustment target (the two meets simultaneously) that a, rear border are postponed
Between (1) 27 bellows and 28 bellows, the temperature difference is greater than 40 DEG C;
(2) 28 box temperature are lower than 365 DEG C;
The adjustment target that b, rear border shift to an earlier date
28 box temperature are higher than 280 DEG C;
3) forward and backward control border, front and back regulate bound prediction
4) Adjusted Option: the blast that the temperature of position, front adjustment border bellows is worth according to weather report by changing main exhauster adjusts, and the temperature of position, rear adjustment border bellows adjusts by changing combustor machine speed according to the difference result of temperature measured value and setting value;
5) using the deviate of front adjustment boundary position and rear adjustment border position box temperature measured value and setting value as the ginseng variable factor regulating power, and can be controlled sintering end point regulating the difference functions correlation of power and temperature measured value and setting value to carry out matching by nerve network system.
Regulate dynamic relation formula as follows
A, preconditioning mode tuning power
(1) front border postpones to regulate power
F=ψ（260-t24）
(2) front border regulates power in advance
F=ψ (45-Δ t) or F=ψ (t
24-345)
B, emergent shaping modes regulate power
(1) the adjustment power of border delay afterwards
F=Φ (40-Δ t) or F=Φ (t
28-365)
(2) the adjustment power that shifts to an earlier date of border afterwards
F=Φ（280-t28）
Note: in formula,
ψ, Φ-need by creation data matching obtain incidence coefficient;
T
24, t
28-be respectively 24,28 bellows EGT measured values;
The difference of Δ t-EGT measured value and setting value.
Above only describes general principle of the present invention and preferred embodiment, those skilled in the art can make many changes and improvements according to foregoing description, and these changes and improvements should belong to protection scope of the present invention.
Claims (5)
1. combustion zone touches the sintering end point bilateral boundary compensating control method that end points before and after end section is border, it is characterized in that, comprises the following steps:
1) sintering machine underlying parameter, front control boundary position, rear control boundary position, front adjustment boundary position and rear adjustment boundary position is determined;
2) when determining normally to produce, the temperature values of position, front adjustment border bellows and the temperature values of position, rear adjustment border bellows;
3) temperature of front control boundary position and rear control boundary position two bellows is basic point matching conic section, and the temperature value of conic section and front control boundary position joining is as predicted value;
4) blast that the temperature of position, front adjustment border bellows is worth according to weather report by changing main exhauster adjusts, and the temperature of position, rear adjustment border bellows adjusts by changing combustor machine speed according to the difference result of temperature measured value and setting value;
5) using the deviate of front adjustment boundary position and rear adjustment border position box temperature measured value and setting value as the ginseng variable factor regulating power, and can be controlled sintering end point regulating the difference functions correlation of power and temperature measured value and setting value to carry out matching by nerve network system.
2. combustion zone according to claim 1 touches the sintering end point bilateral boundary compensating control method that end points before and after end section is border, it is characterized in that: front control boundary position is that combustion zone touches starting point bellows position, bottom, and rear control boundary position is the position that combustion zone touches terminal bellows position, bottom and sintering end point.
3. combustion zone according to claim 2 touches the sintering end point bilateral boundary compensating control method that end points before and after end section is border, it is characterized in that: front adjustment boundary position is that combustion zone touches the previous bellows position of bottom starting point, rear adjustment boundary position is that combustion zone touches a bellows position after the terminal of bottom.
4. combustion zone according to claim 1 touches the sintering end point bilateral boundary compensating control method that end points before and after end section is border, it is characterized in that: lower than the lower limit of normal range (NR), namely the predicted value of front adjustment boundary position thinks that appearance postpones by sintering end point position, start sintering end point position and postpone preconditioning pattern; Higher than the upper limit of normal range (NR), namely the predicted value on front adjustment border thinks that sintering end point position by appearance in advance, start sintering end point position and shift to an earlier date preconditioning pattern;
Front border postpones preconditioning power F=ψ (before t-t24);
Front border shifts to an earlier date preconditioning power F=ψ (t poor-Δ t) or F=ψ (t24-t1),
The incidence coefficient that wherein ψ, Φ-need is obtained by creation data matching;
Before t-be front adjusting position box temperature minimum of a value;
T is poor-and be the minimum of a value of the temperature gap of front adjusting position and front control boundary position bellows;
T
24-be respectively front adjusting position box temperature measured value;
The difference of Δ t-temperature measured value and setting value;
T1-is front adjusting position box temperature maximum.
5. combustion zone according to claim 1 touches the sintering end point bilateral boundary compensating control method that end points before and after end section is border, it is characterized in that: lower than the lower limit of normal range (NR), namely the rear predicted value on border that regulates thinks that sintering end point position has occurred in advance, start sintering end point position emergent shaping modes in advance, higher than the upper limit of normal range (NR), namely the predicted value on front adjustment border thinks that postponing has appearred in sintering end point position, start sintering end point position and postpone emergent shaping modes;
Rear border postpones to regulate power F=Φ (poor after t-Δ t) or F=Φ (t28-t2);
Rear border regulates power F=Φ (after t-t28) in advance;
In formula,
ψ, Φ-need by creation data matching obtain incidence coefficient;
After t-be rear adjusting position box temperature minimum of a value;
Poor after t-be the minimum of a value of the temperature gap of rear adjusting position and rear control boundary position bellows;
T28-be rear adjusting position box temperature measured value;
The difference of Δ t-temperature measured value and setting value;
T2-is rear adjusting position box temperature maximum.
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| CN108088398A (en) * | 2016-11-23 | 2018-05-29 | 中冶长天国际工程有限责任公司 | A kind of injection assisted sintering method combustion measurement device and measuring method |
| CN109738443A (en) * | 2019-01-30 | 2019-05-10 | 中南大学 | Analyze the method and system of the flourishing layer migration velocity of sintering cup test |
| CN115200371A (en) * | 2022-07-14 | 2022-10-18 | 中冶华天工程技术有限公司 | Multi-bellows cooperative control method in iron ore sintering process |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108088398A (en) * | 2016-11-23 | 2018-05-29 | 中冶长天国际工程有限责任公司 | A kind of injection assisted sintering method combustion measurement device and measuring method |
| CN109738443A (en) * | 2019-01-30 | 2019-05-10 | 中南大学 | Analyze the method and system of the flourishing layer migration velocity of sintering cup test |
| CN109738443B (en) * | 2019-01-30 | 2022-01-11 | 中南大学 | Method and system for analyzing migration speed of red fire layer of sintering cup test |
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