CN102758032B - Method for real-time predication of blast furnace pipeline fault probability - Google Patents
Method for real-time predication of blast furnace pipeline fault probability Download PDFInfo
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Abstract
The invention relates to a method for real-time predication of blast furnace pipeline fault probability. A blast furnace pipeline fault probability index P is predicated and analyzed in real time according to various detection data of current blast furnace operation parameters including air pressure, ejection pressure, gas flow, static pressure detection, furnace top temperature, blast furnace air oxygen quantity and the like. Operators can timely adjust corresponding operation parameters according to information prompted by a system when the probability index rises, so that pipeline faults can be avoided, and stability and smoothness in operation of a furnace can be guaranteed.
Description
Technical field
The present invention relates to the blast furnace detection method of field of metallurgy, particularly, the present invention relates to a kind of real-time estimate blast furnace generation pipeline probability method for the blast furnace detection, described method is carried out real-time estimate according to the parameter of operation of blast furnace to blast furnace generation pipeline probability, avoiding blast furnace generation pipeline, thereby guarantee the steady running of the working of a furnace.
Background technology
In the operating process of metallurgy high furnace; the factor that occurs much influencing the blast furnace stable smooth operation through regular meeting; described factor comprises that pipeline, hanging, slump material wait for the unusual working of a furnace, and these unusual working of a furnaces can have influence on the stable and safety of the output of blast furnace, every economic and technical norms or even harm equipment.
Wherein, the basic reason of blast furnace generation pipeline is: a certain regional gas flow is excessive on the blast furnace cross section, and gas speed is too fast, causes this zone furnace material fluidization.And the major cause that causes these unusual working of a furnaces has a lot, comprises blast furnace crude fuel situation, the hot state of State of Blast Furnace, air-flow situation, slagging regime, stokehold operation situation etc.
For avoiding blast furnace generation pipeline, thereby guarantee the steady running of the working of a furnace, must carry out real-time estimate to blast furnace generation pipeline probability.
Existing pipeline Prediction and Control Technology be last century the eighties from the GO-STOP system of external introduction.This system worsens the working of a furnace and is divided into the furnace charge not direct motion that descends, and the stove thermal change is moving or stove is hot low excessively, and the bad three major types of slagging tap taps a blast furnace.This system is at first judged respectively each parameter of blast furnace, carries out comparing in three scopes according to each operating parameters of blast furnace and the cut off value of setting separately, declares a result in " good ", " attention ", " bad ", carries out sub-category to each parameter again.
Secondly, each operating parameters is divided into level differentiation and change differentiation and calculates the GS number of these two kinds of differentiations, wherein the level differentiation is divided into 8 classes, comprise slag iron residual quantity (PSB), stock gas situation (GAS) etc. in full stove ventilation property (DPF2), local ventilation property (DSP), the hot state of stove (HI), furnace charge decline situation (SHI), the cupola well, the change differentiation is divided into 4 classifications.Comprise pressure of air supply, shaft pressure, stove heat number, stock gas.Each classification is set cut off value respectively, judge a result in " good ", " attention ", " bad " according to cut off value.Then, respectively 8 levels are differentiated and 4 changes are differentiated to add up and differentiated GS number and total change differentiation GS number as total level, and declared a result in " good ", " attention ", " bad ".At last total level is differentiated GS number and total change and differentiate the GS number and carry out addition, declare a result in " good ", " attention ", " bad " according to the cut off value of setting.
The GO-STOP system of the external introduction used of blast furnace is at present differentiated the level of blast furnace operating parameter and change is differentiated the result that provides and is three of " good ", " attention ", " bad " result qualitatively, can not provide the result with operability of quantification.
Because the development of blast furnace operation technology and detection technique, original GO-STOP expert systems can not satisfy the higher level development of blast furnace to the judgement of blast furnace generation pipeline.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of real-time estimate blast furnace generation pipeline probability method is provided, it can come real-time estimate blast furnace generation pipeline probability according to the parameter of operation of blast furnace, when finding that this probability index raises, operator just can information according to system suggestion in time adjust corresponding operating parameters, thereby avoid taking place pipeline, thereby guaranteed the stable smooth operation of the working of a furnace.
In order to solve the problems of the technologies described above, the invention provides a kind of real-time estimate blast furnace generation pipeline probability method, establishing blast furnace generation pipeline probability is P:
P=W_BSG* ∑ W
jP
j, j=1 wherein, 2 ... 7;
In the formula,
W
jThe probability index P that causes pipeline for each factor
jTo the weight of total probability indices P, j=1 wherein, 2 ... 7, W
jThe factor of indication and P
jEach factor unanimity of indication is as P
1Indication be the conditions of blast furnace factor to producing the probability of pipeline, W
1Be the conditions of blast furnace factor to producing the weight of pipeline probability.Its span is between 0 to 1, and is more big to the influence that causes the pipeline probability, and its weight is also just more big, and different blast furnace institute value is different.
P
1For the conditions of blast furnace present situation causes the probability index of pipeline, W
1Usually between 0.4-0.8, preferred W
1=0.7.
That conditions of blast furnace embodies is permeability index K value and the blast furnace pressure differential deltap P of blast furnace, more big if K value or Δ P have departed from the specified standards value, illustrates that the possibility of blast furnace stock column generation fluidization (that is pipeline takes place) is more big, probability index P
1Scope between 0-100%, its value is more low more good, more big explanation conditions of blast furnace causes the possibility of pipeline more big.Because conditions of blast furnace is big to the influence degree that causes the blast furnace pipeline, so its corresponding weights W
1Also relatively large, generally between 0.4-0.8.
P
2For the blast furnace gas distributions causes the probability index of pipeline, W
2Span between 0.3-0.6, preferred W
2=0.5.
Blast furnace is to record the power that gas temperature is represented gas fluid in blast furnace by being installed in thermometric galvanic couple in the blast furnace.Blast furnace is equipped with the cross temperature galvanic couple at the furnace throat place, have 21, wherein the blast furnace central point has a galvanic couple inspection center temperature (representing with CCT), and all the other 20 are waited radius to be divided into 5 circles, every circle has 4 galvanic couples, and 4 temperature of one of the most close furnace wall circle are represented 4 temperature in edge.Steel brick on the blast furnace circumferential direction, coal gas fan housing all respectively are equipped with 8 galvanic couples to detect the intensity of edge air-flow than the position height of cross temperature.4 medial temperatures of CCT temperature and edge of general cross temperature are represented the power of gas fluid in blast furnace central gas stream and edge air-flow, because fixing by the air-flow total amount of blast furnace, if the edge air-flow is few at most for the air-flow by the center, the edge is many at least for air-flow by the center, so center and peripheral air-flow power all will be in a reasonable range, the center is strong excessively, the too weak blast furnace gas utilization ratio that can cause in edge descends, fuel consumption increases, the center excessively a little less than, the edge can cause blast furnace permeability to descend too by force, and direct motion is unusual.And the reason that pipeline takes place generally all to be blast furnace edge air-flow too strong and cause the local fluidization of material of blast furnace.In addition, the deviation of 4 temperature in edge, 8 temperature of steel brick and 8 temperature of coal gas fan housing is represented blast furnace in the homogeneity of edge air-flow, at the blast furnace edge, if the air-flow of certain point is very strong, other point is relatively low, and namely the deviation of edge air-flow is big, just is easy to cause the generation of pipeline.W
2Expression blast furnace gas distributions is to sending out the influence degree that causes taking place pipeline.Probability index P
2Scope between 0-100% because the coal gas distributions is bigger to the influence degree that causes pipeline, W
2Span between 0.3-0.6, concrete value need be decided according to the characteristics of each blast furnace operating.
P
3For furnace heat load causes the probability index of pipeline, W
3Span between 0.2-0.6, preferred W
3=0.5.
Furnace heat load calculates according to blast furnace furnace wall water coolant water temperature difference and the water yield, characterizes the situation that the blast furnace inner furnace wall is bondd by slag iron, if furnace wall by slag iron bond more, then water temperature difference can reduce, thermal load reduces; It is less to bond, and causes water temperature difference to raise, and thermal load raises.The too high or too low stable smooth operation that does not utilize blast furnace of thermal load, too high then furnace wall directly contact with slag iron with gas stream in the stove and damage furnace lining and water cooler easily, and too low blast furnace causes the furnace wall knot thick easily.If the furnace wall thermal load is very high always on certain direction, illustrate that the slag iron of bonding is few, the furnace wall circumferential direction occurs inhomogeneous, causes pipeline at the thermal load higher position easily.In addition, thermal load raises suddenly from lower level, illustrates that the slag iron of blast furnace furnace wall bonding comes off suddenly, also can cause pipeline to take place.So when thermal load in the value of being above standard scope, or thermal load fluctuation pipeline occurs, probability index P when big easily
3Scope between 0-100%, W
3The expression blast furnace heat load is to causing taking place the influence degree of pipeline, W
3Span between 0.2-0.6, concrete value need be decided according to the characteristics of each blast furnace operating.
P
4For fluctuating, roof pressure causes the probability index of pipeline, W
4Span between 0.7-0.9, preferred W
4=0.9.
The roof pressure of blast furnace generally is set in a fixed value, under the prerequisite of non-artificial setting and equipment failure, the reason of roof pressure fluctuation be exactly in the State of Blast Furnace certain zone resistance occurs and descend suddenly, the pressure reduction between roof pressure and the blast reduces suddenly.Reducing of this resistance is most because the furnace charge fluidization causes.The probability that pipeline has taken place appearance roof pressure fluctuation explanation blast furnace is very big.If pipeline has taken place, its important performance blast furnace roof pressure fluctuation just.Probability index P
4Scope between 0-100%, W
4The fluctuation of expression blast furnace roof pressure is to causing taking place the influence degree of pipeline, W
4Span between 0.7-0.9, concrete value need be decided according to the characteristics of each blast furnace operating.
P
5The probability index that causes pipeline when for the shaft static pressure fluctuation taking place, W
5Span between 0.1-0.6, preferred W
5=0.2.
Generally which floor pressure detection meter is the short transverse along blast furnace be provided with, and every layer generally has four detections by circumferential direction, and such pressure detection meter is referred to as the shaft static pressure.Along short transverse, that pressure is minimum is furnace top pressure TP, and pressure the highest be blast BP, during, direct motion stable at blast furnace, the static pressure difference between each layer is stable, the pressure difference between four static pressures of every layer should be 0.But when not direct motion of conditions of blast furnace, it is unstable that each layer static pressure difference becomes, and the pressure difference between every layer the static pressure is also non-vanishing.So when fluctuation takes place static pressure, may be to cause because the fluidization (being pipeline) of stock column appears in regional area.So probability index P
5Scope generally between 0-100%, W
5Expression shaft static pressure causes taking place the influence degree of pipeline when fluctuation takes place, also may cause other the special working of a furnace, W because static pressure fluctuates
5Span between 0.1-0.6, concrete value need be decided according to the characteristics of each blast furnace operating.
P
6The probability index that causes pipeline when descending unusually for the blast furnace gas utilization ratio, W
6Span between 0.1-0.3, preferred W
6=0.1.
Before may pipeline occurring, an important sign is exactly that gas utilization rate can descend suddenly.This is that coal gas with stock column heat exchange does not take place fully and reacts, and causes the CO too high levels in the coal gas, shows that the blast furnace gas utilization ratio descends suddenly after fluidization occurring because of stock column.But when the calculating other factors causes the probability index higher (P＞50%) of pipeline takes place, if gas utilization rate descends suddenly, the probability very high (＞80%) that pipeline takes place is described.Cause taking place the probability index of pipeline when not high (P≤50%) at other factors, the unusual reason that descends of gas utilization rate is a lot of owing to causing, and causes the probability index weights W of pipeline so descend because the blast furnace gas utilization ratio is unusual
6Span between 0.1-0.3, concrete value need be decided according to the characteristics of each blast furnace operating.
P
7The probability index that causes pipeline when raising for blast furnace furnace roof temperature anomaly, W
7Span between 0.1-0.3, preferred W
7=0.1.
Similar to the unusual situation about descending of gas utilization rate, before may pipeline occurring, another important sign is exactly that gas temperature can descend suddenly.This is that coal gas with stock column heat exchange takes place fully, causes the gas temperature height, shows that throat temperature TT raises suddenly after fluidization occurring because of stock column.But when the calculating other factors causes the probability index higher (P＞50%) of pipeline takes place, if throat temperature raises unusually, the probability very high (＞80%) that pipeline takes place is described.Cause taking place the probability index of pipeline when not high (P≤50%) at other factors, the unusual reason that raises of throat temperature is a lot of owing to causing, so cause the probability index weights W of pipeline because blast furnace furnace roof temperature anomaly raises
7Span between 0.1-0.3, concrete value need be decided according to the characteristics of each blast furnace operating.
W_BSG is that bosh coal gas amount is to producing the weight of pipeline influence.
The air quantity that blast furnace blasts is referred to as the air-supply ratio with the furnace volume ratio, a suitable air-supply ratio is arranged in every blast furnace production process, experience according to Baosteel, suitable air-supply is than between 1.6 to 1.7, produces in than scope in suitable air-supply, and conditions of blast furnace, index etc. all can appear at best state, if but be lower than or be higher than this suitable air-supply ratio, then the working of a furnace of blast furnace, index can descend, and depart from more greatly, and unusual probability may occur can be more high.It is all different that suitable air-supply is compared to every blast furnace.The influence of air-supply comparison blast furnace mainly embodies the influence of the coal gas amount (being called for short bosh coal gas amount) at unit time blast-furnace bosh position, air-supply can cause bosh portion coal gas amount high or low than high or low, and the bosh coal gas amount (BSG) of different blast furnaces is different according to the characteristics of each blast furnace to the weights W _ BSG that produces the pipeline influence.Be that Baosteel four blast-furnace bosh coal gas amounts (BSG) are to producing the weights W _ BSG of pipeline influence below.
In described real-time estimate blast furnace generation pipeline probability method, described conditions of blast furnace present situation causes the probability index P of pipeline
1=α P
11+ β P
12, wherein,
α, β are weight, span is between 0 to 1, α=0.8 in Baosteel four blast furnaces prediction pipeline probability of occurrence index, β=0.2, this is selected according to the experience of blast furnace production, because the blast of blast furnace or ventilation property pressure reduction cause the probability of pipeline can be very high, and that the unusual working of a furnace causes taking place the probability of pipeline is relatively low.
P
11The probability index that causes pipeline for blast or ventilation property pressure reduction;
P
12The probability index that causes taking place pipeline for the unusual working of a furnace.
In described real-time estimate blast furnace generation pipeline probability method, described blast furnace gas distributions causes the probability index P of pipeline
2Size (is installed in four cantilever temperature measuring equipments at furnace throat place with 4 temperature in cross temperature edge, have 5 to 6 galvanic couples to detect the temperature distribution of blast furnace charge level place air-flow on the every cantilever), (place evenly is equipped with 8 galvanic couples every 45 ° to 8 temperature of throat armour at blast furnace throat steel brick, to detect lip temperature) and reach 8 temperature of coal gas sealing cover and (every 45 ° 8 galvanic couples are installed evenly at blast furnace gas sealing cover place, to detect lip temperature) variation tendency of calculation deviation is identical, the deviation of calculating is more big, and the pipeline probability of generation is also more big.
Prediction blast furnace generation pipeline probability method of the present invention, by the current operating parameter of blast furnace, as comprise that tens kinds of blast, roof pressure, coal gas stream, static pressure detection, throat temperature, blast furnace wind oxygen amounts etc. detect data and come real-time estimate to analyze the probability index of blast furnace generation pipeline.When operator find that this probability index raises, just can information according to system suggestion in time adjust corresponding operating parameters, thereby avoid taking place pipeline, thereby guarantee the stable smooth operation of the working of a furnace.
Description of drawings
Fig. 1 is the reasoning from logic figure of blast furnace pipeline total probability index in the prediction blast furnace generation pipeline probability method of the present invention;
Fig. 2 causes the reasoning from logic figure of the probability index of blast furnace generation pipeline for conditions of blast furnace in the prediction blast furnace generation pipeline probability method of the present invention;
Fig. 3 is the reasoning from logic figure of the probability index of blast furnace generation pipeline when the blast furnace gas distributions is unusual in the prediction blast furnace generation pipeline probability method of the present invention;
Fig. 4 is the reasoning from logic figure of the probability index of blast furnace generation pipeline when furnace heat load fluctuates in the prediction blast furnace generation pipeline probability method of the present invention;
Fig. 5 is the reasoning from logic figure that causes the probability index of pipeline generation when roof pressure, static pressure, blast furnace gas utilization ratio and throat temperature are unusual in the prediction blast furnace generation pipeline probability method of the present invention.
Embodiment
Below, for a more detailed description to the present invention by reference to the accompanying drawings with embodiment.Present embodiment only is the description to best mode for carrying out the invention, scope of the present invention is not had any restriction.
Embodiment
As shown in Figure 1, cause the reasoning from logic figure of the probability index P of blast furnace generation pipeline for conditions of blast furnace in the prediction blast furnace generation pipeline probability method of the present invention.The calculation formula of blast furnace generation pipeline probability P is:
P=W_BSG* ∑ W
jP
j, j=1 wherein, 2 ... 7;
In the formula,
W
jThe probability index P that causes pipeline for each factor
jTo the weight of total probability indices P, j=1 wherein, 2 ... 7,
P
1For the conditions of blast furnace present situation causes the probability index of pipeline, note W
1=0.7;
P
2For the blast furnace gas distributions causes the probability index of pipeline, note W
2=0.5;
P
3For furnace heat load causes the probability index of pipeline, note W
3=0.5;
P
4For fluctuating, roof pressure causes the probability index of pipeline, note W
4=0.9;
P
5The probability index that causes pipeline when for the shaft static pressure fluctuation taking place, note W
5=0.2;
P
6The probability index that causes pipeline when descending unusually for the blast furnace gas utilization ratio, note W
6=0.1;
P
7The probability index that causes pipeline when raising for blast furnace furnace roof temperature anomaly, note W
7=0.1;
W_BSG is that bosh coal gas amount is to producing the weight of pipeline influence.
Simultaneously, according to the probability index P value of the blast furnace generation pipeline that calculates, the blast furnace parameter control is taked different treatment processs, is specially:
1), when P value scope is 0～30%, the possibility of expression blast furnace generation pipeline is little;
2), when P value scope is 30～70%, the expression blast furnace pipeline may take place;
3), when P value scope is 70% when above, pipeline very might take place in the expression blast furnace;
For these three kinds of probability, the mode difference of its processing.Possibility occurrence hour is only listed prediction result and is not proposed to handle suggestion; For contingent, not only list predicting the outcome, also to advise; For what might take place very much, should list predict, also detailed suggestion to be proposed, even close loop maneuver.
As shown in Figure 2, cause the reasoning from logic figure of the probability index of blast furnace generation pipeline for conditions of blast furnace in the prediction blast furnace generation pipeline probability method of the present invention.The parameter of estimating the conditions of blast furnace present situation mainly is situation about occurring in blast furnace blast level (representing with BP), blast trend, blast wandering situation, blast furnace furnace roof roof pressure (representing with TP), smelting cycle of blast furnace permeability index (representing with K) blast furnace the unusual working of a furnace such as slump material, pipeline, hanging etc.
The sign of pipeline is that blast continues to descend, and blast and air quantity are asymmetric, and pressure reduction reduces, and ventilation property K value is very low.
Same hypothesis permeability index K value
Namely not thought at 2.3～2.5 o'clock pipeline trip can take place or the pipeline probability takes place minimum, or differential pressure Δ P (=BP-TP) when 160～180KPa, not think pipeline trip can take place or the pipeline probability takes place minimum.If but K value≤2.3 or Δ P≤160KPa just have the possibility that pipeline takes place.
So when K value≤2.3 or Δ P≤160Kpa, start the calculating that the pipeline probability index takes place in prediction.
Start the probability of predicting the generation pipeline after calculating according to blast trend, ventilation property (pressure reduction) trend, it is P that note blast or ventilation property (pressure reduction) cause the probability of pipeline
11
If the unusual working of a furnace takes place, behind slump material, pipeline, the hanging etc. pipeline takes place easily also as taking place in a smelting cycle.Remember that the probability index that the unusual working of a furnace causes taking place pipeline is P
12
P
11With p
12The common P that forms
1, namely the working of a furnace causes taking place the probability index P of pipeline
1=α P
11+ β P
12, its weight, β are according to the desirable different value of difference of each blast furnace.
Among Fig. 2, K or Δ P are currency, and K ' or Δ P ' are a last value,
Or
For starting the set(ting)value of design conditions.
K represents the blast furnace permeability index,
The lower limit of permeability index scope during expression conditions of blast furnace stable smooth operation, as Baosteel four blast furnace permeability index ranges in [2.52.8] interval,
Be 2.5;
P represents the current blast of blast furnace;
The lower limit of blast furnace blast during expression conditions of blast furnace stable smooth operation, as Baosteel four blast furnace blast scopes in [395KPa415KPa] interval,
Then be 395KPa;
N is illustrated in the number that occurs the slump material in time of blast furnace 40 batch of materials of packing into;
M is illustrated in the interior number that pipeline takes place of time of blast furnace 40 batch of materials of packing into;
K ' is illustrated in a last permeability index of current permeability index;
P ' is illustrated in a last wind pressure value of current blast;
L represents the number of times that permeability index K or blast P raise;
K
0Permeability index scope during expression conditions of blast furnace stable smooth operation.As Baosteel four blast furnace permeability index ranges in [2.5 2.8] interval;
P
0Blast furnace blast scope during expression conditions of blast furnace stable smooth operation, as Baosteel four blast furnace blast scopes in [395KPa415KPa] interval;
R represents to get K/K
0And P/P
0Minimum value;
As shown in Figure 3, the reasoning from logic figure of the probability index of blast furnace generation pipeline when the blast furnace gas distributions is unusual in the prediction blast furnace generation pipeline probability method of the present invention.Take place before the pipeline, ANOMALOUS VARIATIONS can take place in local air flow, shows that mainly air-flow is inclined to one side, can pass through cross temperature, throat armour temperature, coal gas sealing cover temperature etc. present air-flow distribution situation is found in the detection of coal gas stream.
According to 4 temperature in cross temperature edge, 8 temperature of throat armour and 8 temperature of coal gas sealing cover, according to the temperature computation deviation of these temperature spots.The possibility of the more big generation pipeline of deviation is just more big.
Rule of thumb, the air-flow by the edge is more than the air-flow by the center.If the edge seriously is subjected to press down, the center is very strong, than being easier to the generative center pipeline.
Among Fig. 3,
T
1The relative deviation that the expression edge is 4;
T
2Expression steel brick temperature (T
Sft) 8 relative deviation;
T3 represents the relative deviation of 8 of coal gas fan housing temperature;
T
MaxExpression edge vertex temperature;
The reasoning from logic figure of the probability index of blast furnace generation pipeline when fluctuating for furnace heat load in the prediction blast furnace generation pipeline probability method of the present invention as shown in Figure 4.When the furnace wall big area came off, the position gas-flow resistance that comes off reduced suddenly, and mass air flow is from coming off by causing pipeline.The furnace wall big area comes off and can represent by the horizontal Q of thermal load and thermal load fluctuation (Δ Q).The note furnace wall comes off and causes the probability P of pipeline
3
Wherein Q is the thermal load of full stove, and Δ Q is the lift velocity of for some time span DTime,
As shown in Figure 5, the reasoning from logic figure that causes the probability index that pipeline takes place when roof pressure, static pressure, blast furnace gas utilization ratio and throat temperature are unusual in the prediction blast furnace generation pipeline probability method of the present invention.When blast furnace generation pipeline, roof pressure can fluctuate, and the size of roof pressure fluctuation and the frequency of fluctuation can be represented the size of pipeline.When TP fluctuates greater than 8Kpa, illustrate that roof pressure produces fluctuation.When Δ TP 〉=8Kpa or in 20min TP fluctuation secondary, then the probability index P=80% of pipeline.The pipeline probability index was P when fluctuation took place the note roof pressure
4
When blast furnace generation pipeline, shaft static pressure curve is vertical configuration, and pressure reduction is zero or is negative value on certain section height.If the arbitrary two-layer pressure difference Δ P of BP, TP, each layer static pressure≤and (20-N) Kpa, probability index P=(70+N) % (N=0,1,2 that pipeline then takes place ...), the probability P of pipeline when fluctuation takes place the note static pressure
5
When blast furnace generation pipeline, because scurrying out from the part, air-flow cause the chemical energy utilization to reduce, gas utilization rate descends.If probability index P 〉=70% of pipeline takes place, and η
COThe probability index P=80% of pipeline then takes place greater than 0.5% in the reduction amplitude in 10s.The probability that pipeline takes place when descending unusually the note gas utilization rate is P
6
When blast furnace generation pipeline, the contacting and react minimizing of air-flow and raw material, heat exchanger effectiveness reduces, and causes the top temperature sharply to raise.If probability index P 〉=70% of pipeline takes place, and the warm TT in top has risen 50 ℃ in 5s, and the probability index P=80% of pipeline then takes place, and the probability of pipeline was P when note top temperature abnormality raise
7
Among Fig. 5,
η CO represents the gas utilization rate of blast furnace gas;
Δ η CO represents that the gas utilization rate of blast furnace gas changes;
TT represents throat temperature, i.e. the top temperature;
Δ TT represents the variation of throat temperature;
In addition, large blast furnace has a suitable air-supply ratio, blast furnace is at the different times of stove labour, its wind oxygen amount (output) can be different, if large blast furnace air-supply ratio is less than its suitable air-supply ratio, then corresponding conditions of blast furnace can change, the large blast furnace of Baosteel, in wind oxygen amount hour, the working of a furnace is difficult to control on the contrary more, inclined to one side as air-flow, blast wandering is big, but because wind oxygen amount is little, the probability that pipeline takes place on the contrary can be lower, in the prediction of pipeline probability, considered the influence of wind oxygen amount to the working of a furnace, wind oxygen water gaging has been put down represent with blast-furnace bosh coal gas amount, revised on the basis of the final probability index P that calculates.
According to real-time estimate blast furnace generation pipeline probability method of the present invention, it can come real-time estimate blast furnace generation pipeline probability according to the parameter of operation of blast furnace, when finding that this probability index raises, operator just can information according to system suggestion in time adjust corresponding operating parameters, thereby avoid taking place pipeline, thereby guaranteed the stable smooth operation of the working of a furnace.
Claims (7)
1. real-time estimate blast furnace generation pipeline probability method, it is characterized in that: establishing blast furnace generation pipeline probability is P, and its calculation formula is: P=W_BSG* ∑ W
jP
j, j=1 wherein, 2 ... 7;
In the formula,
W
jThe probability index P that causes pipeline for each factor
jTo the weight of total probability indices P, be 0-1, j=1 wherein, 2 ... 7,
P
1For the conditions of blast furnace present situation causes the probability index of pipeline, note W
1=0.4-0.8;
P
2For the blast furnace gas distributions causes the probability index of pipeline, note W
2=0.3-0.6;
P
3For furnace heat load causes the probability index of pipeline, note W
3=0.2-0.6;
P
4For fluctuating, roof pressure causes the probability index of pipeline, note W
4=0.7-0.9;
P
5The probability index that causes pipeline when for the shaft static pressure fluctuation taking place, note W
5=0.1-0.6;
P
6The probability index that causes pipeline when descending unusually for the blast furnace gas utilization ratio, note W
6=0.1-0.3;
P
7The probability index that causes pipeline when raising for blast furnace furnace roof temperature anomaly, note W
7=0.1-0.3;
W_BSG is that bosh coal gas amount is to producing the weight of pipeline influence, 1.0-1.6.
2. real-time estimate blast furnace generation pipeline probability method according to claim 1, it is characterized in that: described conditions of blast furnace present situation causes the probability index P of pipeline
1=α P
11+ β P
12, wherein,
α, β are weight, and span is between 0 to 1;
P
11For blast or ventilation property pressure reduction cause the probability of pipeline, between 0-100%;
P
12For the unusual working of a furnace causes taking place the probability index of pipeline, between 0-100%.
3. real-time estimate blast furnace generation pipeline probability method according to claim 1 is characterized in that:
Described W
1=0.7, W
2=0.5, W
3=0.5, W
4=0.9, W
5=0.2, W
6=0.1, W
7=0.1.
4. real-time estimate blast furnace generation pipeline probability method according to claim 1 is characterized in that:
Described W_BSG=1.2-1.4.
5. real-time estimate blast furnace generation pipeline probability method according to claim 1 is characterized in that:
Described blast furnace gas distributions causes the probability index P of pipeline
2The variation tendency of temperature computation deviation of 4 temperature of variation tendency and cross temperature edge, 8 temperature of throat armour and 8 temperature of coal gas sealing cover identical.
6. real-time estimate blast furnace generation pipeline probability method according to claim 2 is characterized in that: α=0.6-0.8, β=0.2-0.4.
7. real-time estimate blast furnace generation pipeline probability method according to claim 6 is characterized in that: α=0.8, β=0.2.
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| CN109284942B (en) * | 2018-10-31 | 2021-08-03 | 山西太钢不锈钢股份有限公司 | Method for determining reasonable range of blast furnace raw fuel parameters |
| CN109685289B (en) * | 2019-01-21 | 2020-11-10 | 重庆电子工程职业学院 | Method, device and system for forward prediction of blast furnace conditions |
| CN111710135B (en) * | 2020-05-26 | 2022-04-12 | 广东韶钢松山股份有限公司 | Early warning and control process for brick collapse of blast furnace hot blast stove fire well wall |
| CN112961949B (en) * | 2021-03-12 | 2022-11-18 | 鞍钢股份有限公司 | Method for rapidly judging pipeline stroke of blast furnace |
| CN114941044B (en) * | 2022-05-25 | 2024-03-01 | 江苏省沙钢钢铁研究院有限公司 | 2000-level high furnace pipeline prediction and treatment method |
| CN115305299A (en) * | 2022-08-05 | 2022-11-08 | 广东韶钢松山股份有限公司 | Blast furnace pipeline airflow pre-judging and processing method and device |
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