CN1766130A - Harmonization control method for blast furnace hot blast stove system - Google Patents
Harmonization control method for blast furnace hot blast stove system Download PDFInfo
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Abstract
The invention relates to compatible control method for hot-blast stove of blast furnace, which comprises: determining the lowest blast temperature, designing correlated process parameters and constructing case database; extracting burning data to add into database; obtaining real-time process parameters; with case-base inference method, predicting the time that blast temperature drops down to lowest temperature as the blast end time and the burning terminal time of successive furnace; comparing the predicted time with preset terminal time of successive furnace; according to result, changing gas supply to achieve the waste gas temperature upper limit with set terminal; repeating said steps to realize the variable-period running. This invention increases total blast temperature, and reduces blast temperature.
Description
Technical field
The invention belongs to blast furnace and hot blast cupola combustion automatic control technology field, particularly a kind of control method for coordinating that is predicted as the iron-smelting blast furnace hot blast stove system of realizing on the basis with hot blast temperature.
Background technology
Blast funnace hot blast stove is the visual plant during blast furnace ironmaking is produced, and it is bearing the keying action that the heat that coal gas produced of will burning is delivered to blast furnace blast.A blast-furnace hot-air furnace system is made of 3～4 hotblast stoves usually, and the working process of each hotblast stove is divided into burning, changes stove and air-supply three phases.Several hotblast stoves alternately are operated in ventilation state in order, to reach the purpose that continuous and stable hot blast feeding is provided to blast furnace.
For each hotblast stove of a hot blast stove system, its working process is alternate or perhaps sequence batch (, and a plurality of hotblast stove cooperatings have then formed the process of successive air-supply on the whole.Because hotblast stove institute's accumulative heat in combustion phases can not directly and simply be measured, so existing hot blast stove system control method (no matter being control automatically or manually control), basically be to control combustion processes indirectly as process parameter, and reflect the quality of combustion processes with them with dome temperature and spent air temperture.For the burning of each hotblast stove, change stove and the air-supply stage has then been taked the operation scheme of fixed cycle, the length of the combustion time of each hotblast stove and air-supply time all is the same and is pre-set.
Existing hot blast stove system adopts the shortcoming of fixed cycle operation scheme to be mainly reflected in the following aspects:
1) owing to each hotblast stove in the hot blast stove system there are differences on individuality, their incendiary thermo-efficiency is different, if all adopt the identical air-supply time, will cause wind pushing temperature bigger fluctuation to occur because of the difference of each hotblast stove savings heat;
2) calorific value of the main fuel-blast furnace gas of hot blast stove system is not changeless, and when calorific value was higher, hotblast stove accumulative heat was just higher in same combustion time, otherwise just lower.Therefore if adopt fixed combustion time and air-supply time, can cause the fluctuation of hot blast temperature bigger too;
3) no matter be because the difference of hotblast stove individuality or the variation of caloric power of gas, if hot blast stove system adopts the operation scheme of fixed cycle, the hotblast stove of having put aside more heat transfer at combustion phases just can not discharge its heat fully in the air-supply stage so, thereby gas consumption is strengthened, cause the unnecessary waste of the energy.
Existing blast furnace hot-blast stove combustion automatic control method is mainly two big classes, promptly based on mathematical model with based on the control method of artificial intelligence.
Some developed countries are because the volume of blast furnace is bigger, and the check and analysis means of processing parameter are perfect, and all act as a fuel with blast furnace gas mixing coke-oven gas, so generally adopted the control method based on the blast furnace and hot blast cupola combustion mathematical model.The topmost problem that the mathematical model control method faces in application is to need perfect detection and analysis meter to match, and the price of these instrument is more expensive, and the workload of later maintenance is bigger.
The present another kind of autocontrol method of using based on artificial intelligence, mainly comprise the fuzzy control of blast furnace and hot blast cupola combustion optimal air-fuel ratio, gas flow and air-fuel ratio set expert systems control, by detecting Self organizing Fuzzy Control that the waste gas remaining oxygen realizes, spent air temperture Adaptive Fuzzy Control or the like, briefly introduce as follows to the characteristics of these methods.
(1) realizes that the automatic key of controlling of blast furnace and hot blast cupola combustion is the fluctuation along with gas pressure and quality, and carry out the real-time adjustment (adjustment of air flow quantity can be converted into the adjustment to air-fuel ratio) of gas flow and air flow quantity according to the different states of blast funnace hot blast stove.The optimal air-fuel ratio fuzzy control method of propositions such as Huang Zhaojun is comparison closing to reality application requiring (referring to 2002 the 4th phase 38-40 of a metallurgical automation page or leaf), it regulates air-fuel ratio in the dome temperature rising stage of blast furnace and hot blast cupola combustion according to a kind of fuzzy control rule, to realize the soaring fast of dome temperature; Regulate air-fuel ratio according to another kind of fuzzy control rule stationary phase at dome temperature, be not less than its stationary value to keep dome temperature; In the stationary phase of dome temperature, according to the climbing speed of spent air temperture, regulate the gas flow of supplying with blast funnace hot blast stove, when finishing, burning reaches the maximum value that working specification requires just to guarantee spent air temperture.
(2) the blast furnace and hot blast cupola combustion expert systems control method (referring to 2002 the 4th phase 57-62 of control engineering page or leaf) of Ma Zhuwu proposition.The core of this method is according to expert systems MAES-JT and sums up more than 100 control law that extract in advance, preset required gas flow of blast furnace and hot blast cupola combustion and air flow quantity by 5 periods, and determine whether reducing or increasing coal gas and the air flow quantity that sets by the climbing speed and the afterburning time of calculating spent air temperture.
(3) the Self organizing Fuzzy Control method (referring to 1999 the 6th phase 64-68 of steel research journal page or leaf) that realizes according to the waste gas remaining oxygen that proposes such as Jiang Liqiu.The variation that the characteristics of this method are need to use the zirconium white oxygen measuring instrument installed in the flue to measure remaining oxygen in the waste gas, by a kind of Self organizing Fuzzy Control method coefficient of excess air is remained on the best combustion band again, be that coefficient of excess air is 1.02～1.10, corresponding waste gas remaining oxygen is 0.412%～1.900%, thereby improves the efficient of blast furnace and hot blast cupola combustion.
(4) the adaptive fuzzy control method (referring to 2004 the 5th phase 71-74 of steel research journal page or leaf) that proposes such as Wang Guangyang at the spent air temperture climbing speed control of flameholding phase.The maximum value that spent air temperture just in time required for working specification when this method began for guaranteeing to blow, arriving dome temperature heated with maximum coal gas amount before stationary phase, reach after stationary phase climbing speed with spent air temperture as controlled target, the highest spent air temperture is as restricted condition, manipulated variable is a gas flow, and regulates air flow quantity according to optimal air-fuel ratio.Choose the deviation E and the fuzzy input of velocity of variation C conduct thereof of spent air temperture climbing speed, the output manipulated variable is that U is a gas flow, regulate gas flow according to the variation of spent air temperture climbing speed then: excessive when climbing speed, and when the trend that continue to increase is arranged, reduce gas flow; Bigger than normal when climbing speed, but rate variations keeps flow constant when being negative value; On the low side and when the trend that continues to reduce is arranged when climbing speed, suitably increase gas flow.
A common weak point of existing hotblast stove control method is that they have only considered the control problem of single hotblast stove individuality, and has ignored hotblast stove as a system, solve problem from whole angle.In fact, the heat storage capacity of each hotblast stove is distinguishing in hot blast stove system, and the variation of the calorific value of blast furnace gas is also bigger, therefore adopts the operation scheme of fixed cycle can not guarantee to make the air-supply effect of hot blast stove system integral body to reach optimum.
The synoptic diagram that hot blast stove system fixed cycle operation scheme wind pushing temperature changes as shown in Figure 1.T represents the air-supply time that each hotblast stove is identical among Fig. 1, and curve 1,2 and 3 is respectively 3 hotblast stoves change curve of wind pushing temperature in the corresponding air-supply stage successively.As can be seen from Figure 1, because each hotblast stove all adopts the identical air-supply time, hot blast temperature will occur and be lower than the phenomenon that blast furnace is produced desired temperature value (the horizontal dotted line among Fig. 1), and the fluctuation of hot blast temperature is also bigger after changing the stokehold, shown in curve among Fig. 12 and curve 3 boundaries.
Summary of the invention
The present invention is the weak point that overcomes existing hot blast stove system fixed cycle operation scheme, has proposed a kind of hot blast stove system control method for coordinating that prediction realizes based on hot blast temperature.This method with the minimum wind pushing temperature of whole hot blast stove system as total controlling index, prediction according to the concluding time that the hotblast stove of firm completion of combustion is blown, dynamically set the burning terminal point of follow-up air-supply hotblast stove, thereby each hotblast stove is discharged fully, at combustion phases accumulative heat to reach the dual purpose that reduces gas consumption and reduce the hot blast temperature fluctuation.
The harmonization control method for blast furnace hot blast stove system that the present invention proposes is divided into data and prepares and 2 stages of on-line operation;
The described data preparatory stage comprises following step:
1), sets the minimum temperature value of each hotblast stove air-supply in the hot blast stove system according to the processing requirement of operation of blast furnace;
2) set and hotblast stove wind pushing temperature and relevant process parameter of time length, and construct the case library structure (generally adopting the form of data-base recording) of corresponding relation between reflect heat wind furnace combustion efficacy and the hot blast temperature in view of the above;
3) collect and put in order the historical data of each Combustion of Hot Air Furnace, therefrom extract a plurality of examples and add above-mentioned steps 2 to) among the case library of being constructed;
The described on-line operation stage comprises following step:
4) gather in real time and calculate firm completion of combustion, will enter the process parameter of the hotblast stove in air-supply stage;
5) utilize inference method to dope the time that this hotblast stove wind pushing temperature drops to the described minimum temperature value of above-mentioned data preparatory stage step 1) based on example, and with its air-supply concluding time as this hotblast stove;
6) with above-mentioned steps 5) the burning terminal time (being the time that spent air temperture equals rules set upper limit value) set as the hotblast stove of follow-up air-supply of air-supply concluding time;
7) by the climbing speed of the current spent air temperture of hotblast stove of follow-up air-supply, calculate the burning terminal time of its expectation, to burn then terminal time and above-mentioned steps 6) in the burning terminal time set compare, and the coal gas amount size that change enters the hotblast stove of follow-up air-supply according to comparative result, so that it reaches the higher limit of the spent air temperture of rules regulation at burning terminal time of setting;
8) hotblast stove of each firm completion of combustion and the hotblast stove of its follow-up air-supply are repeated above-mentioned steps 4)～7), thereby the variable cycle operation of realization hot blast stove system.
Technical characterstic of the present invention and effect:
The present invention is a kind of harmonization control method for blast furnace hot blast stove system that is predicted as the basis realization with hot blast temperature.The characteristics of this method are that hotblast stove fixed cycle operation scheme is changed into the variable cycle operation scheme, prediction according to the concluding time that the hotblast stove of firm completion of combustion is blown, dynamically adjust and set the burning terminal time of follow-up air-supply hotblast stove, thereby each hotblast stove can be discharged in its air-supply stage fully at combustion phases accumulative heat, reduce gas consumption and reduce the fluctuation that hot blast temperature occurs.
The inventive method has overcome the weak point that existing hot blast stove system adopts the fixed cycle operation scheme, hotblast stove is considered every possible angle as a system, the changed situation quality award from the ministry turns to global optimization, improved the whole wind pushing temperature of hot blast stove system, reduced owing to changing the wind pushing temperature fluctuation that stove causes, for the stably manufactured of blast furnace has been created necessary condition.
Description of drawings
Fig. 1 is the synoptic diagram that wind pushing temperature changes under the existing fixed periodic duty.
Fig. 2 is the FB(flow block) of hot blast stove system control method for coordinating embodiment of the present invention.
The synoptic diagram of the burning terminal time that Fig. 3 sets for the present invention and the burning terminal time of expectation.
The synoptic diagram that wind pushing temperature changed when Fig. 4 controlled (variable cycle) method for adopting coordination of the present invention.
Embodiment
The harmonization control method for blast furnace hot blast stove system that the present invention proposes reaches embodiment in conjunction with the accompanying drawings and is described in detail as follows:
The blast funnace hot blast stove that the present invention proposes is coordinated control control and is based on that prediction to the hotblast stove air-supply time realizes, be that embodiment describes its working process in detail with a concrete blast-furnace hot-air furnace system below, the significant parameter of the blast funnace hot blast stove that present embodiment is selected for use is: furnace volume 230M
3, be equipped with 3 hotblast stoves, adopt 2 to burn 1 combustion system that send; Hotblast stove is a top ignition, and the fuel of use all is blast furnace gas, 450 ℃ of the higher limits of the spent air temperture of rules regulation.
The harmonization control method for blast furnace hot blast stove system flow process of present embodiment as shown in Figure 2, is divided into data and prepares and 2 stages of on-line operation.The data preparatory stage comprises following step:
1) according to the processing requirement of operation of blast furnace, setting hot blast stove system is the minimum temperature value of each hotblast stove air-supply;
2) set and hotblast stove wind pushing temperature and relevant process parameter of time length, and construct the case library structure (form of data-base recording) of corresponding relation between reflect heat wind furnace combustion efficacy and the hot blast temperature in view of the above;
3) collect and finishing heat wind furnace incendiary historical data, therefrom extract a plurality of examples and add above-mentioned steps 2 to) among the actual gains storehouse of being constructed;
The on-line operation stage comprises following step:
4) gather in real time and calculate firm completion of combustion, will enter the process parameter of the hotblast stove in air-supply stage;
5) utilize inference method to dope the time that this hotblast stove wind pushing temperature drops to the described minimum temperature value of above-mentioned data preparatory stage step 1) based on example, and with its air-supply concluding time as this hotblast stove;
6) with above-mentioned steps 5) the burning terminal time set as follow-up air-supply hotblast stove of air-supply concluding time, promptly spent air temperture equals the time of rules set upper limit value;
7) by the climbing speed of the current spent air temperture of hotblast stove of follow-up air-supply, calculate the burning terminal time of its expectation, to burn then terminal time and above-mentioned steps 6) in the burning terminal time set compare, and the coal gas amount size that change enters the hotblast stove of follow-up air-supply according to comparative result, so that it reaches the higher limit of the spent air temperture of rules regulation at burning terminal time of setting;
8) hotblast stove of each firm completion of combustion and the hotblast stove of follow-up air-supply are repeated above-mentioned steps 4)～7), thereby the variable cycle operation of realization hot blast stove system.
Above-mentioned steps 1) the minimum temperature value of described hotblast stove air-supply is to determine according to the concrete processing requirement of blast furnace production.The embodiment of this minimum temperature value can be 1140 ℃.
Blast furnace is the unit that Iron And Steel Industry is produced the pig iron, it need advance hot blast by drum and come combustion of coke, so that reduction of iron ore is become molten iron, the effect of hotblast stove is the temperature that air blast is heated to requirement, the heat that hot blast is brought blast furnace into accounts for 1/4 of total heat, and hot blast temperature is generally 1100～1200 ℃ at present.The temperature that hotblast stove is sent into blast furnace is high more, and the coke ratio that the pig iron is produced (ratio of the pig iron per ton that coke consumption amount and blast furnace are produced) is just low more, therefore on processing requirement general all with high wind-warm syndrome as the target of pursuing.But the actual conditions of every blast furnace is different, and the type of supporting hotblast stove, volume and thermo-efficiency is difference to some extent all, and the minimum temperature value of therefore above-mentioned hotblast stove air-supply should be according to practical situation, and just the heat storage capacity that hotblast stove possessed reasonably determines.
Above-mentioned steps 2) described case library structure is by the analysis to a large amount of historical datas of Combustion of Hot Air Furnace, and the process parameter that adopts Control System of Airheater to be easy to gather is constructed.
The operational process of hotblast stove is a kind of sequence batch (production process, it combustion phases institute accumulative heat can not be simply, directly measure, the quality of combustion efficacy can only reflect with the height of hot blast temperature and the length of time length indirectly in its air-supply stage.But find by analysis to burning and a large amount of historical datas of air-supply stage, there is certain corresponding relation between the statistical parameter of the process parameter of combustion efficacy and combustion phases, particularly some reflection burning storage effects, and this relation can't (be difficult to) accurately express with the form of mathematical model in other words, therefore this corresponding relation is preserved with a kind of form of data instance, with the reasoning foundation that these concrete examples are good and bad as the judgement combustion efficacy and the solution hot blast temperature is predicted.
Above-mentioned steps 2) embodiment of the case library structure of corresponding relation comprises 2 parts between described reflect heat wind furnace combustion efficacy and the hot blast temperature, be respectively the problem description section of example and example separate the description part:
The process parameter that the problem description section of example comprises is as follows:
Average dome temperature, the highest dome temperature, average spent air temperture, the highest spent air temperture, gas consumption amount, air consumption, average air-fuel ratio, average gas pressure and Combustion of Hot Air Furnace time.
The description part of separating of example includes only 1 process parameter: the air-supply concluding time.Needs for the coordination control that realizes hot blast stove system, it is defined as from the hotblast stove putting in blast drops to above-mentioned steps 1 up to hot blast temperature) required time of minimum temperature value of described blast furnace production requirement, be called the air-supply concluding time of satisfying processing requirement, be called for short the air-supply concluding time.The air-supply concluding time, the embodiment of used unit was minute (min).
Therefore, the form of the case library structure availability database record of present embodiment structure represents that data item wherein comprises following process parameter:
Average dome temperature, the highest dome temperature, average spent air temperture, the highest spent air temperture, gas consumption amount, air consumption, average air-fuel ratio, average gas pressure, Combustion of Hot Air Furnace time, air-supply concluding time.
Above-mentioned steps 3) purpose is according to above-mentioned steps 2) defined case library structure, historical data calculating above-mentioned steps 2 according to Combustion of Hot Air Furnace) numerical value of each process parameter that provides, then with the process parameter value of these data-base recording forms as the example that extracts, add among the case library item by item.I bar record in i example corresponding instance storehouse can be expressed as:
C
i＝(P
i1，P
i2，P
i3，P
i4，P
i5，P
i6，P
i7，P
i8，P
i9，S
i)，i＝1，2，……，N
Wherein, P
I1, P
I2, P
I3, P
I4, P
I5, P
I6, P
I7, P
I8And P
I9Represent the average dome temperature of i example, the highest dome temperature, average spent air temperture, the highest spent air temperture, gas consumption amount, air consumption, average air-fuel ratio, average gas pressure and Combustion of Hot Air Furnace time respectively, S
iThe air-supply concluding time of representing i example, N represents the bar number of example.
The number of the example that present embodiment adopted is 72, i.e. N=72.The quantity of the example that comprises in the case library should be abundant, to cover the various combustion efficacies that may occur as far as possible.We can say, the quantity of example is many more, just high more based on the order of accuarcy of the The reasoning results that these examples drew, but too much example can cause the speed of reasoning and calculation process slack-off, therefore adopt example what can according to practical situation to accuracy and computing velocity take all factors into consideration determine.
Above-mentioned steps 4) be the beginning in on-line operation stage, its effect is each process parameter of gathering and calculate firm completion of combustion in real time, being about to enter the hotblast stove in air-supply stage, and these process parameters are above-mentioned steps 2) problem description section of the example that sets.
Above-mentioned steps 5) effect is with in above-mentioned steps 4) in each process parameter of the reflect heat wind furnace combustion processes that draws as a problem new, to be solved, utilization is obtained separating of this problem based on the inference method of example, just draws predicting the outcome to this hotblast stove air-supply concluding time.Above-mentioned steps 5 in the present embodiment) specifically comprise the steps:
(1) with above-mentioned steps 4) in each process parameter of hotblast stove of the firm completion of combustion gathering in real time and calculate be expressed as vector form, that is:
P
new＝(P
1，P
2，P
3，P
4，P
5，P
6，P
7，P
8，P
9)
Wherein, P
1, P
2, P
3, P
4, P
5, P
6, P
7, P
8And P
8Represent the average dome temperature of this hotblast stove, the highest dome temperature, average spent air temperture, the highest spent air temperture, gas consumption amount, air consumption, average air-fuel ratio, average gas pressure and Combustion of Hot Air Furnace time respectively.
(2) calculate P one by one by following formula
NewAnd the Euclidean space distance D between the problem description section of every the example that draws above-mentioned steps 3)
i:
(3) according to the previous step Euclidean space apart from result calculated, get several examples conducts and the current comparatively similar example (getting 3 in the present embodiment) of problem to be solved of its middle distance minimum, to separating of these several examples part is described, just their air-supply concluding time is calculated its arithmetical av, separating of the current problem that the arithmetical av that calculates just draws as the reasoning based on example, just the air-supply concluding time of this hotblast stove that draws by prediction, use TM
PreExpression, unit is minute (min).
Above-mentioned steps 6) be with above-mentioned steps 5) the burning terminal time set as follow-up air-supply hotblast stove of air-supply concluding time of drawing by prediction, promptly spent air temperture equals the time of rules set upper limit value, uses TM equally
PreExpression, unit is minute (min).So-called follow-up air-supply hotblast stove is in just completion of combustion, is about to enter the hotblast stove of blowing after the hotblast stove in air-supply stage.
Above-mentioned steps 7) effect is regulated the gas flow that enters hotblast stove according to the comparison between the burning terminal time of burning terminal time of setting and expectation, and the spent air temperture when Combustion of Hot Air Furnace is finished equals rules set upper limit value just.
Above-mentioned steps 7) concrete steps of embodiment are described as follows in conjunction with Fig. 4:
Among Fig. 3, the time 1 is the time of the hotblast stove putting in blast of firm completion of combustion; Time 2 is in above-mentioned steps 5) in air-supply concluding time of drawing of prediction, the burning terminal time of just follow-up air-supply hotblast stove setting; Time 3 is the burning terminal point that the climbing speed of spent air temperture is estimated when very fast; Time 4 is the burning terminal time that the climbing speed of spent air temperture is estimated when slow; Dotted line 5 is the higher limit of the spent air temperture of rules regulation; Solid line 6 is the variation tendency of climbing speed spent air temperture when very fast; Solid line 7 is the variation tendency of climbing speed spent air temperture when slow.
(1) after the hotblast stove putting in blast of firm completion of combustion, gather and the following process parameter of calculated for subsequent air-supply hotblast stove: current spent air temperture, use TE
0Expression, unit is ℃; The climbing speed of current spent air temperture is represented with VE, and unit is ℃/min.The higher limit TE of the spent air temperture of rules regulation
MaxExpression.
(2) be calculated as follows the burning terminal time TM that follow-up air-supply hotblast stove is estimated:
(3) be calculated as follows burning terminal time TM and the above-mentioned steps of estimating according to current spent air temperture climbing speed 6) the burning terminal time TM of the setting that draws
PreBetween relative error Δ TM (%):
(4) relative error of obtaining according to previous step is calculated as follows the regulated quantity Δ GF (%) of the gas flow that enters follow-up air-supply hotblast stove:
ΔGF＝α·ΔTM
Wherein α is a correction factor, this coefficient can artificially be set according to the adjusting experience, also can obtain by the regression analysis to the Combustion of Hot Air Furnace historical data, it has reflected the relation between gas flow and the spent air temperture climbing speed, gets α=0.8 according to the adjusting experience in the present embodiment.
(5) regulated quantity according to the gas flow that obtains changes the coal gas amount size that enters follow-up air-supply hotblast stove, so that it reaches the higher limit of the spent air temperture of rules regulation at the burning terminal time of setting.
It needs to be noted, when adjusting enters the gas flow of hotblast stove, also will regulate accordingly, air-fuel ratio can be maintained in the interval range of optimal air-fuel ratio the air flow quantity that enters hotblast stove, higher with the efficient that guarantees Combustion of Hot Air Furnace.
Above-mentioned steps 8) step 4)～7 in above-mentioned on-line operation stage are described) all to repeat each " follow-up " air-supply hotblast stove, thus realize the variable cycle operation of hot blast stove system on the whole.
The inference method based on example that the present invention adopts (Case-Based Reasoning is called for short CBR) is based on the experience of finding the solution similar problem over and obtains a kind of reasoning pattern of current problem solving result.The document that CBR has with its be translated into reasoning based on case, based on the reasoning of example or based on reasoning of example etc.Nineteen eighty-two, Roger Schank at first proposes the CBR method in " DynamicMemory " book.CBR is bionical to the human cognitive process, compares with additive method, and CBR can handle the knowledge that the form of being unsuitable for turns to rule, the actual procedure of more approaching human decision-making.Therefore, showed the inherent connotation of problem more naturally than traditional RBR based on the reasoning of example.
Quick-reading flow sheets based on the inference method of example is described below:
(1) problem new, to be solved appears;
(2) calculate by the similarity between the problem description section of each example of storing in new problem and the case library, find out 1 or the several example the most similar to current problem;
(3) directly or by simple computation, reuses the description of separating of similar to new problem 1 or several examples, the experience that similar problem is found the solution in utilization just in the past solves the new problem of appearance.
Wherein, similarity is calculated a variety of algorithms, and the Euclidean space distance is the simplest and a kind of intuitively.The present invention is exactly apart from the mathematics foundation as similarity between measurement new problem and each example with Euclidean space.
Air-fuel ratio of the present invention is to enter the air flow quantity of blast funnace hot blast stove and the ratio of fuel (coal gas) flow, the thermo-efficiency of blast funnace hot blast stove was the highest when air-fuel ratio remained within the optimal air-fuel ratio interval, and the theoretical combustion temperature that dome temperature and spent air temperture can reach under the condition of identical gas quality is also the highest.A span that with the optimal air-fuel ratio is mid point is exactly the optimal air-fuel ratio interval.Air-fuel ratio is in the optimal air-fuel ratio interval, and the thermo-efficiency of Combustion of Hot Air Furnace is just than higher.
When the hot blast stove system of present embodiment adopted coordination of the present invention to control (variable cycle) method, the synoptic diagram that wind pushing temperature changes as shown in Figure 4.Wherein, T
I+1, T
iAnd T
I-1Represent respectively 1,2 with No. 3 different air-supply times of hotblast stove, curve 1,2 and 3 is represented the profile of 1,2 and No. 3 hotblast stove wind pushing temperature variation respectively, curve 4,5 and 6 is represented the profile of 1,2 and No. 3 exhaust gas of hot-blast stove temperature variation respectively, dotted line 7 is in above-mentioned steps 1) definite minimum hot blast temperature value, dotted line 8 is the higher limit of the spent air temperture of rules regulation.As can be seen from Figure 2, owing to adopted the variable cycle operation, the hot blast temperature that each hotblast stove is sent all can maintain more than the minimum temperature value of processing requirement, has also reduced by changing the hot blast temperature fluctuation that stove causes.
Claims (3)
1, a kind of harmonization control method for blast furnace hot blast stove system is divided into data and prepares and two stages of on-line operation;
The described data preparatory stage comprises following step:
1), sets the minimum temperature value of each hotblast stove air-supply in the hot blast stove system according to the processing requirement of operation of blast furnace;
2) set and hotblast stove wind pushing temperature and relevant process parameter of time length, and construct the case library structure of corresponding relation between reflect heat wind furnace combustion efficacy and the hot blast temperature in view of the above;
3) collect and put in order the historical data of each Combustion of Hot Air Furnace, therefrom extract a plurality of examples and add described step 2 to) among the case library of being constructed;
The described on-line operation stage comprises following step:
4) gather in real time and calculate firm completion of combustion, will enter the process parameter of the hotblast stove in air-supply stage;
5) utilize inference method to dope the time that this hotblast stove wind pushing temperature drops to the minimum temperature value of setting in the described step 1) based on example, and with its air-supply concluding time as this hotblast stove;
6) the burning terminal time that the air-supply concluding time of described step 5) is set as the hotblast stove of follow-up air-supply;
7) by the climbing speed of the current spent air temperture of hotblast stove of follow-up air-supply, calculate the burning terminal time of its expectation, the burning terminal time of setting in terminal time and the described step 6) of will burning then compares, and the coal gas amount size that change enters the hotblast stove of follow-up air-supply according to comparative result, so that it reaches the higher limit of the spent air temperture of rules regulation at burning terminal time of setting;
8) hotblast stove of each firm completion of combustion and the hotblast stove of its follow-up air-supply are repeated described step 4)～7), thus the variable cycle operation of realization hot blast stove system.
2, harmonization control method for blast furnace hot blast stove system as claimed in claim 1, it is characterized in that described step 2) process parameter set comprises: average dome temperature, the highest dome temperature, average spent air temperture, the highest spent air temperture, gas consumption amount, air consumption, average air-fuel ratio, average gas pressure, Combustion of Hot Air Furnace time, air-supply concluding time.
3, harmonization control method for blast furnace hot blast stove system as claimed in claim 1 is characterized in that, described step 7) specifically may further comprise the steps:
(1) after the hotblast stove putting in blast of firm completion of combustion, gather and the following process parameter of calculated for subsequent air-supply hotblast stove: current spent air temperture, use TE
0Expression, unit is ℃; The climbing speed of current spent air temperture is represented with VE, and unit is ℃/min.The higher limit TE of the spent air temperture of rules regulation
MaxExpression.
(2) be calculated as follows the burning terminal time TM that follow-up air-supply hotblast stove is estimated:
(3) be calculated as follows the burning terminal time TM of the setting that the burning terminal time TM that estimates according to current spent air temperture climbing speed and described step 6) draw
PreBetween relative error Δ TM (%):
(4) relative error of obtaining according to previous step is calculated as follows the regulated quantity Δ GF (%) of the gas flow that enters follow-up air-supply hotblast stove:
ΔGF＝α·ΔTM
Wherein α is a correction factor,
(5) regulated quantity according to the gas flow that obtains changes the coal gas amount size that enters follow-up air-supply hotblast stove, so that it reaches the higher limit of the spent air temperture of rules regulation at the burning terminal time of setting.
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| CN103514338A (en) * | 2012-06-15 | 2014-01-15 | 上海宝信软件股份有限公司 | Method for predicting flow amount of blast furnace gas used by hot blast stove |
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