CN116987834A - Control method and device for steel packing balance - Google Patents
Control method and device for steel packing balance Download PDFInfo
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- CN116987834A CN116987834A CN202310962368.5A CN202310962368A CN116987834A CN 116987834 A CN116987834 A CN 116987834A CN 202310962368 A CN202310962368 A CN 202310962368A CN 116987834 A CN116987834 A CN 116987834A
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- molten iron
- total amount
- ladle
- blast furnace
- flow rate
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 40
- 239000010959 steel Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000012856 packing Methods 0.000 title claims abstract description 35
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 818
- 229910052742 iron Inorganic materials 0.000 claims abstract description 409
- 238000010079 rubber tapping Methods 0.000 claims abstract description 64
- 238000007599 discharging Methods 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 description 24
- 238000009628 steelmaking Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 9
- 238000003723 Smelting Methods 0.000 description 6
- 206010022971 Iron Deficiencies Diseases 0.000 description 3
- 238000005429 filling process Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/12—Opening or sealing the tap holes
Abstract
The invention discloses a control method and a device for steel packing balance. The method comprises the following steps: calculating the first predicted total amount of molten iron of the blast furnace in the current heat; calculating the residual molten iron amount of the heat according to the first predicted molten iron total amount and the molten iron packing filling capacity; if the residual molten iron amount is larger than the molten iron residual standard, re-determining the opening aperture of the blast furnace and calculating a second predicted molten iron total amount; carrying out ladle filling according to the redetermined opening aperture of the blast furnace, and calculating the actual total amount of molten iron and the average flow rate of molten iron; and determining the tapping time of the next furnace according to the second predicted total amount of molten iron, the actual total amount of molten iron and the average flow rate of molten iron so as to balance the iron and steel ladle. According to the embodiment of the invention, through the estimation of the total amount of the molten iron produced by the blast furnace and the calculation of the residual amount of the molten iron in the next heat, the residual amount of the molten iron in the next heat is reduced, so that the probability that the ladle cannot be filled in the heat is reduced, the heat damage of the molten iron is reduced, and the ladle filling balance of the steel is realized.
Description
Technical Field
The invention relates to the technical field of steelmaking, in particular to a method and a device for controlling steel packing balance.
Background
Iron-steel balance is the stability between the amount of molten iron required to be consumed in steelmaking and the amount of molten iron produced in iron making, and the balance between the amount of heat generated by molten iron (generally expressed as temperature) and the amount of heat required in steelmaking.
The temperature of molten iron is a key quality index of a steelmaking system and is a core index representing the energy of molten iron. The temperature of molten iron is high, the energy consumption can be reduced in the steelmaking process, the temperature of the molten iron is low, and the qualified molten steel can be smelted only by supplementing heat in a steelmaking system. The temperature loss in the ladle charging process of the molten iron refers to the gradient of the temperature loss of the molten iron caused by the process of switching the molten iron charging process between the main line and the auxiliary line in the ladle charging process of the blast furnace.
In the prior art, the tapping amount difference of each furnace of the blast furnace is large, the filling amount of the ladle is basically fixed, so that when tapping of each furnace is finished, the amount of molten iron in the secondary ladle does not meet the steelmaking requirement, and the next furnace molten iron filling needs to be waited, so that the ladle of the steel is unbalanced, and the heat loss of the molten iron is large.
Disclosure of Invention
The invention provides a control method and a control device for steel packing balance, which are used for reducing the heat damage of molten iron and realizing the steel packing balance.
According to an aspect of the present invention, there is provided a control method of steel packing balance, the method comprising:
calculating the first predicted total amount of molten iron of the blast furnace in the current heat;
calculating the residual molten iron amount of the heat according to the first predicted molten iron total amount and the molten iron packing filling capacity;
if the residual molten iron amount is larger than the molten iron residual standard, re-determining the aperture of the opening of the blast furnace and calculating a second predicted total amount of molten iron;
carrying out ladle filling according to the redetermined opening aperture of the blast furnace, and calculating the actual total amount of molten iron and the average flow rate of molten iron;
and determining tapping time of the next furnace according to the second predicted total amount of molten iron, the actual total amount of molten iron and the average flow rate of molten iron so as to balance steel packaging.
Optionally, the step of calculating the first predicted total amount of molten iron in the present heat of the blast furnace includes:
acquiring a first tapping time, the residual molten iron amount in a blast furnace and the molten iron generation rate;
and calculating the first predicted total molten iron according to the first tapping time, the residual molten iron amount in the blast furnace, the molten iron generation rate and a total molten iron calculation formula.
Optionally, the calculation formula of the total amount of molten iron is:
M＝ΔM+Mt×T；
wherein M is the total amount of molten iron; Δm is the amount of residual molten iron in the blast furnace; mt is the molten iron generation rate; t is the tapping time.
Optionally, the step of re-determining the open tap hole diameter of the blast furnace and calculating the second predicted total amount of molten iron includes:
changing the aperture of the blast furnace iron opening;
acquiring a first molten iron flow rate corresponding to the aperture of the blast furnace tapping hole;
calculating a second tapping time according to the first molten iron flow rate and a tapping time calculation formula;
calculating the total amount of blast furnace molten iron under the current aperture according to the second tapping time;
judging whether the residual molten iron amount under the total amount of the current blast furnace molten iron is larger than a molten iron residual standard or not;
if yes, changing the aperture of the blast furnace iron opening again;
and if not, taking the total amount of the blast furnace molten iron under the current aperture as the second predicted molten iron total amount. Optionally, the tapping time calculation formula is:
T＝(ΔM+Mt×T)/V；
wherein T is tapping time; Δm is the amount of residual molten iron in the blast furnace; mt is the molten iron generation rate; v is the flow rate of molten iron.
Optionally, the step of ladle charging according to the redetermined blast furnace open tap hole aperture comprises:
calculating a pre-determined flow rate according to the first tapping time and the first predicted total amount of molten iron;
filling and timing the ladle; wherein, the molten iron containing and filling amount comprises: lower limit capacity, standard capacity, and upper limit capacity;
calculating the current ladle flow rate according to the lower limit capacity and the lower limit capacity filling time;
and determining the current ladle packing capacity according to the current ladle flow rate and the preset flow rate.
Optionally, the step of determining the ladle filling capacity according to the ladle flow rate and the predetermined flow rate comprises:
judging whether the current ladle flow rate is greater than the preset flow rate;
if yes, filling an nth ladle; wherein n is more than or equal to 2;
if not, the current ladle is continuously filled to the upper limit capacity.
Optionally, the step of calculating the actual total amount of molten iron and the average flow rate of molten iron includes:
calculating the average flow rate of molten iron according to the flow rates of molten iron from the first ladle to the n-1 th ladle;
judging whether the average flow speed of the molten iron is larger than the preset flow speed;
if yes, the lower limit capacity of the filling value of the nth ladle is determined;
if not, the nth molten iron package is filled to the upper limit capacity;
the actual total amount of molten iron is calculated according to the filling capacity of each ladle.
Optionally, the step of determining the tapping time of the next heat according to the second predicted total amount of molten iron, the actual total amount of molten iron and the average flow rate of molten iron includes:
calculating a molten iron difference between the second predicted molten iron total amount and the actual molten iron total amount;
calculating a molten iron difference value discharge time according to the molten iron average flow rate and the molten iron difference value;
and determining the tapping time of the next furnace according to the molten iron difference value discharging time.
According to another aspect of the present invention, there is provided a control apparatus for balancing a steel ladle, the apparatus comprising:
the calculation module is used for calculating the first expected total amount of molten iron of the blast furnace in the current heat; calculating the residual molten iron amount of the heat according to the first predicted molten iron total amount and the molten iron packing filling capacity; calculating the actual total amount of molten iron and the average flow rate of molten iron;
the judging module is used for judging whether the residual molten iron amount is larger than a molten iron residual standard or not;
and the time determining module is used for determining the tapping time of the next furnace according to the second predicted total molten iron, the actual total molten iron and the average flow rate of molten iron.
According to the embodiment of the invention, the total amount of molten iron produced in the production of the blast furnace is estimated and used as a first total amount of molten iron, the residual molten iron amount of the heat is calculated according to the packing capacity of the molten iron and the first total amount of molten iron, and when the residual molten iron amount of the heat is larger than the residual standard of molten iron, the aperture of an iron opening of the blast furnace is changed, and the total amount of molten iron produced in the production of the blast furnace of the heat is estimated again and used as a second total amount of molten iron. The remaining amount of molten iron at the second total amount of molten iron is smaller than the molten iron remaining standard. And filling the ladle under the changed aperture of the blast furnace tapping hole, and calculating the actual total amount of molten iron and the average flow rate of molten iron. And determining the tapping time of the next heat by the second predicted total amount of molten iron, the actual total amount of molten iron and the average flow rate of molten iron, so that the steel packing is balanced. According to the embodiment of the invention, through the estimation of the total amount of the molten iron produced by the blast furnace and the calculation of the residual amount of the molten iron in the next heat, the residual amount of the molten iron in the next heat is reduced, so that the probability that the ladle cannot be filled in the heat is reduced, the heat damage of the molten iron is reduced, and the ladle filling balance of the steel is realized.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for controlling the balance of steel packing provided by an embodiment of the invention;
FIG. 2 is a flow chart of another method for controlling the balance of steel packing according to an embodiment of the present invention;
FIG. 3 is a flowchart for re-determining a tap hole diameter of a blast furnace and calculating a second predicted total amount of molten iron according to an embodiment of the present invention;
FIG. 4 is a flow chart of ladle charging provided by an embodiment of the present invention;
FIG. 5 is a flow chart of another ladle charging provided by an embodiment of the present invention;
FIG. 6 is a flowchart for calculating an actual total amount of molten iron and an average flow rate of molten iron according to an embodiment of the present invention;
fig. 7 is a flowchart of another control method for steel packing balance according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiment of the invention provides a control method for steel packing balance. The method can be applied to steel production and is used for reducing the residual molten iron of each heat in the steel production process. Fig. 1 is a flowchart of a control method for steel packing balance according to an embodiment of the present invention. Referring to fig. 1, the method includes:
s110, calculating the first expected total amount of molten iron of the blast furnace in the current heat.
Specifically, in the iron and steel production process, it is necessary to smelt iron-containing ore into liquid molten iron in an iron-making blast furnace and then to perform iron and steel smelting in a steelmaking blast furnace by transferring the molten iron. In the smelting process, the amount of molten iron produced by the blast furnace is affected by various factors including the temperature of the blast furnace, the smelting mode and the time, and the amount of molten iron produced by the blast furnace is not fixed in the actual production process. Therefore, prior to the operation of balancing the steel ladle, it is necessary to perform the pre-calculation of the molten iron produced by the blast furnace according to the current production environment.
S120, calculating the residual molten iron amount of the heat according to the first predicted molten iron total amount and the molten iron packing filling capacity.
Specifically, in the process of transferring molten iron from an iron-making blast furnace to a steel-making blast furnace, it is necessary to fill the molten iron produced in the iron-making blast furnace into a ladle for aggregation and then transfer the molten iron from the ladle to the steel-making blast furnace. It will be appreciated that in actual production, the ladle charge capacity is less than the capacity of the blast furnace, and the remaining amount of molten iron in the present heat is calculated from the first estimated total amount of molten iron and the ladle charge capacity. When the molten iron in the iron-making blast furnace is insufficient to be filled to the minimum value of the ladle filling capacity, the molten iron in the iron-making blast furnace is not filled into the ladle any more, and at the moment, the molten iron remained in the iron-making blast furnace is the residual molten iron amount of the heat. The molten iron remaining in the ironmaking blast furnace is not transferred any more, and participates in the production of molten iron in the next heat as a part of the amount of residual molten iron in the blast furnace.
And S130, if the residual molten iron amount is larger than the molten iron residual standard, the opening aperture of the blast furnace is redetermined, and a second predicted molten iron total amount is calculated.
Specifically, in the process that the molten iron is transferred to the steelmaking blast furnace in the ironmaking blast furnace, the ironmaking blast furnace does not stop smelting, and at the moment, the production of the molten iron is still carried out in the ironmaking blast furnace. It is understood that the flow rate of molten iron into the ladle is related to the size of the open tap hole of the blast furnace when the molten iron charge is performed. When the aperture of the opening of the blast furnace is larger, the flow rate of molten iron flowing into the ladle is larger; the smaller the size of the opening hole of the blast furnace, the smaller the flow rate of molten iron into the ladle. As the flow rate of molten iron into the ladle changes, the ladle charging time also changes. Since the blast furnace does not stop smelting in the molten iron filling process, the change of the molten iron filling time means the change of the production time of the blast furnace, and the molten iron amount produced by the blast furnace is changed. Therefore, when the aperture of the open iron mouth of the blast furnace changes, the molten iron produced by the blast furnace needs to be estimated and calculated again. It should be noted that the remaining amount of molten iron at the second predicted total amount of molten iron is smaller than the molten iron remaining standard.
And S140, carrying out ladle filling according to the redetermined opening aperture of the blast furnace and calculating the actual total amount of molten iron and the average flow rate of molten iron.
Specifically, the charging time of the ladle is counted when the ladle is charged. And calculating the flow rate of the molten iron in the filling process of the ladle according to the filling time and the filling capacity of the ladle. The average flow rate of molten iron can be calculated according to the flow rate of molten iron in the filling process of each ladle. It will be appreciated that the actual total amount of molten iron may be calculated from the fill capacity of the respective ladle.
And S150, determining tapping time of the next heat according to the second predicted total amount of molten iron, the actual total amount of molten iron and the average flow rate of molten iron so as to balance steel packing.
Specifically, since the remaining molten iron of the present heat is not transferred any more, it participates in the production of the next heat as a part of the amount of the remaining molten iron in the blast furnace. Therefore, in the calculation of the total amount of molten iron in the next heat, it is necessary to consider the remaining molten iron in the present heat, thereby increasing or decreasing the time for producing molten iron in the next heat, decreasing the amount of remaining molten iron in the next heat production, and balancing the ladle charging of steel.
According to the embodiment of the invention, the total amount of molten iron produced in the production of the blast furnace is estimated and used as a first total amount of molten iron, the residual molten iron amount of the heat is calculated according to the packing capacity of the molten iron and the first total amount of molten iron, and when the residual molten iron amount of the heat is larger than the residual standard of molten iron, the aperture of an iron opening of the blast furnace is changed, and the total amount of molten iron produced in the production of the blast furnace of the heat is estimated again and used as a second total amount of molten iron. The remaining amount of molten iron at the second total amount of molten iron is smaller than the molten iron remaining standard. And filling the ladle under the changed aperture of the blast furnace tapping hole, and calculating the actual total amount of molten iron and the average flow rate of molten iron. And determining the tapping time of the next heat by the second predicted total amount of molten iron, the actual total amount of molten iron and the average flow rate of molten iron, so that the steel packing is balanced. According to the embodiment of the invention, through the estimation of the total amount of the molten iron produced by the blast furnace and the calculation of the residual amount of the molten iron in the next heat, the residual amount of the molten iron in the next heat is reduced, so that the probability that the ladle cannot be filled in the heat is reduced, the heat damage of the molten iron is reduced, and the ladle filling balance of the steel is realized.
Fig. 2 is a flowchart of another control method for steel packing balance according to an embodiment of the present invention. Optionally, referring to fig. 2, the step of calculating the first predicted total amount of molten iron in the present heat of the blast furnace includes:
s111, obtaining the first tapping time, the residual molten iron amount in the blast furnace and the molten iron generation rate.
Specifically, the total amount of molten iron produced during the production of the blast furnace is related to the tapping time, the amount of residual molten iron in the blast furnace, and the rate of molten iron production. Wherein, the residual molten iron amount in the blast furnace comprises the molten iron amount produced by smelting in the blast furnace during the period from the last furnace blockage to the current furnace opening and the iron shortage amount in the last furnace. It should be noted that the iron deficiency may be positive or negative; when the iron deficiency is positive, indicating that residual molten iron exists in the last furnace; when the iron deficiency is negative, the actual yield of the last heat is lower than the expected value.
And S112, calculating a first expected total molten iron according to the first tapping time, the residual molten iron amount in the blast furnace, the molten iron generation rate and a calculation formula of the total molten iron.
Specifically, the calculation formula of the total amount of molten iron is:
M＝ΔM+Mt×T；
wherein M is the total amount of molten iron; Δm is the amount of residual molten iron in the blast furnace; mt is the molten iron generation rate; t is the tapping time.
Fig. 3 is a flowchart for re-determining a tap hole diameter of a blast furnace and calculating a second predicted total amount of molten iron according to an embodiment of the present invention. On the basis of the above embodiments, optionally, referring to fig. 3, the step of re-determining the tap hole diameter of the blast furnace and calculating the second predicted total amount of molten iron includes:
s131, changing the aperture of a blast furnace tapping hole.
Specifically, the flow rate of molten iron into the ladle is related to the size of the open tap hole of the blast furnace. When the aperture of the opening of the blast furnace is larger, the flow rate of molten iron flowing into the ladle is larger; the smaller the size of the opening hole of the blast furnace, the smaller the flow rate of molten iron into the ladle.
S132, obtaining a first molten iron flow rate corresponding to the aperture of the blast furnace tapping hole.
Specifically, different blast furnace tapping hole diameters correspond to different molten iron flow rates. The manner of obtaining the flow rate of molten iron at different apertures is varied, and the present embodiment is merely illustrative of the manner of obtaining and is not intended to be limiting. The flow rate of molten iron under different apertures is calculated by the packing capacity and the packing time of molten iron, the relation between the aperture size and the flow rate is determined according to the flow rate of molten iron under different apertures, and the flow rate of molten iron corresponding to the aperture size is calculated according to the relation between the aperture size and the flow rate.
S133, calculating the second tapping time according to the first molten iron flow rate and a tapping time calculation formula.
Specifically, the tapping time calculation formula is:
T＝(ΔM+Mt×T)/V；
wherein T is tapping time; Δm is the amount of residual molten iron in the blast furnace; mt is the molten iron generation rate; v is the flow rate of molten iron.
S134, calculating the total amount of the blast furnace molten iron under the current aperture according to the second tapping time.
Specifically, since the amount of molten iron produced during the production of the blast furnace is related to the tapping time, the amount of residual molten iron in the blast furnace, and the rate of molten iron production. Therefore, the tapping time of the blast furnace is changed, and the total amount of molten iron produced by the blast furnace is also changed.
S135, judging whether the residual molten iron amount under the total amount of the current blast furnace molten iron is larger than a molten iron residual standard; if yes, then execute S136; if not, S137 is performed.
In particular, the molten iron remaining standard characterizes the maximum limit value of the remaining molten iron on the next furnace production impact. The remaining standard of the molten iron can be set according to the capacity and the requirement of the blast furnace in actual production, and the embodiment is not limited to this.
S136, changing the aperture of the blast furnace tapping hole again.
Illustratively, the molten iron remaining standard is 30 tons, the molten iron generation rate is 6 tons/minute, and the amount of iron shortage is 60 tons. When the aperture of the blast furnace tapping hole is changed from 50mm to 52 mm, the flow rate of molten iron corresponding to the aperture of 52 mm is 7.2 tons/min.
According to the formula t= (Δm+mt×t)/V: t= (120+6×t)/7.2, calculating to obtain the iron tapping duration of the heat prejudgment as 100 minutes, and calculating total molten iron=120+6×100=720 tons, wherein each package is filled with 110 tons of molten iron, and the remaining 60 tons of 6 packages can be filled; each pack is filled with 109 tons of molten iron, and 6 packs can be filled with 66 tons; each pack is filled with 108 tons of molten iron, and 6 packs can be filled with 72 tons of residual molten iron; each pack is filled with 111 tons of molten iron, and 6 packs can be filled with the remaining 54 tons; each pack is filled with 112 tons of molten iron, and 6 packs can be filled with 48 tons of residual molten iron. Increasing the drill bit diameter from 50mm to 55mm, increasing the molten iron flow to 7.5 tons/min, obtained according to the formula t= (Δm+mt×t)/V: t= (120+6×t)/7.5, calculating to obtain the iron tapping duration of the heat prejudgment of 80 minutes, and calculating total molten iron=120+6×80=600 tons, wherein each package is filled with 110 tons of molten iron, and 5 packages can be filled with the rest 50 tons; each pack is filled with 109 tons of molten iron, 5 packs can be filled with 55 tons; each pack is filled with 108 tons of molten iron, and 5 packs can be filled with 60 tons of residual molten iron; each pack is full of 111 tons of molten iron, 5 packs can be filled with 45 tons; each pack is filled with 112 tons of molten iron, 5 packs can be filled with 40 tons of residual molten iron. At this time, the remaining amount of molten iron is greater than the remaining standard of molten iron, and the opening aperture of the blast furnace needs to be changed again.
And S137, taking the total amount of the blast furnace molten iron under the current aperture as a second predicted molten iron total amount.
Illustratively, the molten iron remaining standard is 30 tons, the molten iron generation rate is 6 tons/minute, and the amount of iron shortage is 60 tons. When the aperture of the blast furnace tapping hole is changed from 50mm to 48 mm, the flow rate of molten iron corresponding to the aperture of 48 mm is 6.8 tons/min.
According to the formula t= (Δm+mt×t)/V: t= (120+6×t)/6.8, the heat pre-determined iron duration is calculated to be 150 minutes, and the total amount of molten iron is calculated to be=120+6×150=1020 tons. Each pack is filled with 110 tons of molten iron, and can be filled with 9 packs of more than 30 tons; each pack is filled with 109 tons of molten iron, and can be filled with 9 packs of more than 39 tons; each pack is filled with 108 tons of molten iron, and 9 packs can be filled with more than 48 tons; each pack is filled with 111 tons of molten iron, and can be filled with 9 packs of more than 21 tons; each pack is filled with 112 tons of molten iron, and can be filled with 9 packs and more than 12 tons. At this time, the remaining amount of molten iron is smaller than the remaining standard of molten iron.
Fig. 4 is a flow chart of ladle charging provided in an embodiment of the present invention. Optionally, referring to fig. 4, the step of ladle charging according to the redetermined blast furnace tap hole aperture comprises:
s141, calculating a pre-judging flow rate according to the first tapping time and the first predicted total molten iron.
Specifically, the first predicted total amount of molten iron is related to the first tapping time and the predicted flow rate. Therefore, the pre-determined flow rate can be calculated according to the first tapping time and the first predicted total amount of molten iron.
S142, filling and timing the ladle; wherein, molten iron contains the packing volume and includes: lower limit capacity, standard capacity, and upper limit capacity.
Specifically, molten iron smelted in an ironmaking blast furnace is poured into a ladle, and pouring is stopped when the molten iron in the ladle reaches the lower limit capacity of the ladle. Illustratively, the standard ladle capacity is 110 tons; the lower limit capacity is 108 tons; the upper capacity was 112 tons.
S143, calculating the current ladle flow rate according to the lower limit capacity and the lower limit capacity filling time.
S144, determining the current ladle filling capacity according to the current ladle flow rate and the preset flow rate.
Specifically, the current ladle loading capacity is determined based on the current ladle flow rate relative to the predetermined flow rate. Illustratively, when the current ladle flow rate is greater than the predetermined flow rate, charging the ladle to a lower limit capacity of the ladle; when the current ladle flow rate is smaller than the preset flow rate, filling the molten iron to the upper limit capacity of the ladle; and when the current ladle flow rate is equal to the preset flow rate, filling the molten iron to the standard capacity of the ladle.
Fig. 5 is a flow chart of another ladle charging provided by an embodiment of the present invention. Optionally, referring to fig. 5, the step of determining the molten iron packing capacity according to the ladle flow rate and the predetermined flow rate includes:
s1441, judging whether the current ladle flow rate is greater than a pre-judging flow rate; if yes, then execute S1442; if not, S1443 is performed.
Specifically, when the current ladle flow rate is greater than the preset flow rate, filling the molten iron to the lower limit capacity of the ladle; and when the current ladle flow rate is smaller than the preset flow rate, filling the molten iron to the upper limit capacity of the ladle.
S1442, filling an nth ladle; wherein n is more than or equal to 2.
S1443, continuously filling the current ladle to the upper limit capacity.
Fig. 6 is a flowchart for calculating an actual total amount of molten iron and an average flow rate of molten iron according to an embodiment of the present invention. Optionally, referring to fig. 6, the step of calculating the actual total amount of molten iron and the average flow rate of molten iron includes:
s145, calculating the average flow rate of molten iron according to the flow rates of molten iron from the first ladle to the n-1 th ladle.
Specifically, the flow rates of molten iron when filling each ladle are accumulated, and the average flow rate of molten iron can be obtained by dividing the accumulated result by the number of the ladles.
S146, judging whether the average flow speed of molten iron is larger than a preset flow speed; if yes, then execution S147; if not, S148 is performed.
Specifically, when the average flow rate of molten iron is greater than the preset flow rate, filling the nth ladle to the lower limit capacity; and filling the nth ladle to the upper limit capacity when the average flow rate of the molten iron is smaller than the preset flow rate.
S147, the lower limit capacity of the nth ladle filling value.
S148, filling the nth ladle to the upper limit capacity.
S149, calculating the actual total amount of molten iron according to the filling capacity of each ladle.
Specifically, the actual total amount of molten iron can be obtained by accumulating the filling capacities of the respective ladles.
Fig. 7 is a flowchart of another control method for steel packing balance according to an embodiment of the present invention. Optionally, referring to fig. 7, the step of determining the tapping time of the next heat according to the second predicted total amount of molten iron, the actual total amount of molten iron, and the average flow rate of molten iron includes:
s151, calculating a molten iron difference value between the second predicted molten iron total amount and the actual molten iron total amount.
Specifically, at the time of actual production, since the remaining molten iron is not transferred, there is a difference between the actual total amount of molten iron and the second predicted total amount of molten iron.
S152, calculating molten iron difference value discharging time according to the average flow speed of molten iron and the molten iron difference value.
Specifically, the molten iron differential discharging time refers to a time required for complete discharge of the remaining molten iron at the average flow rate of molten iron.
S153, determining the tapping time of the next heat according to the molten iron difference value discharging time.
Specifically, the tapping time refers to the start time of molten iron transfer of the blast furnace, which refers to a specific moment. In actual production, the tapping time of the next heat may be adjusted according to the molten iron difference discharging time and the production plan.
The embodiment of the invention also provides a control device for steel packing balance, which comprises: the device comprises a calculation module, a judgment module and a time determination module.
The calculation module is used for calculating the first expected total amount of molten iron of the blast furnace in the current heat; calculating the residual molten iron amount of the heat according to the first predicted molten iron total amount and the molten iron packing filling capacity; and calculating the actual total amount of molten iron and the average flow rate of molten iron. The judging module is used for judging whether the residual molten iron amount is larger than a molten iron residual standard. The time determining module is used for determining tapping time of the next furnace according to the second predicted total amount of molten iron, the actual total amount of molten iron and the average flow rate of molten iron.
It should be noted that, the control device for steel packing balance provided by the embodiment of the present invention has the beneficial effects of the control method for steel packing balance provided by any embodiment, and is not described herein.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for controlling the balance of steel packaging, comprising:
calculating the first predicted total amount of molten iron of the blast furnace in the current heat;
calculating the residual molten iron amount of the heat according to the first predicted molten iron total amount and the molten iron packing filling capacity;
if the residual molten iron amount is larger than the molten iron residual standard, re-determining the aperture of the opening of the blast furnace and calculating a second predicted total amount of molten iron;
carrying out ladle filling according to the redetermined opening aperture of the blast furnace, and calculating the actual total amount of molten iron and the average flow rate of molten iron;
and determining tapping time of the next furnace according to the second predicted total amount of molten iron, the actual total amount of molten iron and the average flow rate of molten iron so as to balance steel packaging.
2. The method for controlling the balance of steel ladle according to claim 1, wherein the step of calculating the first predicted total amount of molten iron in the present heat of the blast furnace comprises:
acquiring a first tapping time, the residual molten iron amount in a blast furnace and the molten iron generation rate;
and calculating the first predicted total molten iron according to the first tapping time, the residual molten iron amount in the blast furnace, the molten iron generation rate and a total molten iron calculation formula.
3. The method for controlling the ladle balance according to claim 2, wherein the total amount of molten iron is calculated by the formula:
M＝ΔM+Mt×T；
wherein M is the total amount of molten iron; Δm is the amount of residual molten iron in the blast furnace; mt is the molten iron generation rate; t is the tapping time.
4. The method of controlling a ladle balance according to claim 1, wherein the step of redetermining the open tap hole diameter of the blast furnace and calculating the second predicted total amount of molten iron comprises:
changing the aperture of the blast furnace iron opening;
acquiring a first molten iron flow rate corresponding to the aperture of the blast furnace tapping hole;
calculating a second tapping time according to the first molten iron flow rate and a tapping time calculation formula;
calculating the total amount of blast furnace molten iron under the current aperture according to the second tapping time;
judging whether the residual molten iron amount under the total amount of the current blast furnace molten iron is larger than a molten iron residual standard or not;
if yes, changing the aperture of the blast furnace iron opening again;
and if not, taking the total amount of the blast furnace molten iron under the current aperture as the second predicted molten iron total amount.
5. The method for controlling the balance of steel ladle according to claim 4, wherein the tapping time calculation formula is:
T＝(ΔM+Mt×T)/V；
wherein T is tapping time; Δm is the amount of residual molten iron in the blast furnace; mt is the molten iron generation rate; v is the flow rate of molten iron.
6. The method of controlling ladle balance according to claim 1, wherein the step of ladle charging according to the redetermined blast furnace tapping aperture comprises:
calculating a pre-determined flow rate according to the first tapping time and the first predicted total amount of molten iron;
filling and timing the ladle; wherein, the molten iron containing and filling amount comprises: lower limit capacity, standard capacity, and upper limit capacity;
calculating the current ladle flow rate according to the lower limit capacity and the lower limit capacity filling time;
and determining the current ladle packing capacity according to the current ladle flow rate and the preset flow rate.
7. The method of controlling ladle balance according to claim 6, wherein the step of determining the ladle filling capacity based on the ladle flow rate and the predetermined flow rate comprises:
judging whether the current ladle flow rate is greater than the preset flow rate;
if yes, filling an nth ladle; wherein n is more than or equal to 2;
if not, the current ladle is continuously filled to the upper limit capacity.
8. The method of controlling a ladle balance according to claim 6, wherein the step of calculating the actual total amount of molten iron and the average flow rate of molten iron comprises:
calculating the average flow rate of molten iron according to the flow rates of molten iron from the first ladle to the n-1 th ladle;
judging whether the average flow speed of the molten iron is larger than the preset flow speed;
if yes, the lower limit capacity of the filling value of the nth ladle is determined;
if not, the nth molten iron package is filled to the upper limit capacity;
the actual total amount of molten iron is calculated according to the filling capacity of each ladle.
9. The method of controlling a ladle balance according to claim 1, wherein the step of determining the tapping time of the next heat according to the second predicted total amount of molten iron, the actual total amount of molten iron, and the average flow rate of molten iron comprises:
calculating a molten iron difference between the second predicted molten iron total amount and the actual molten iron total amount;
calculating a molten iron difference value discharge time according to the molten iron average flow rate and the molten iron difference value;
and determining the tapping time of the next furnace according to the molten iron difference value discharging time.
10. A control device for the balance of steel packaging, comprising:
the calculation module is used for calculating the first expected total amount of molten iron of the blast furnace in the current heat; calculating the residual molten iron amount of the heat according to the first predicted molten iron total amount and the molten iron packing filling capacity; calculating the actual total amount of molten iron and the average flow rate of molten iron;
the judging module is used for judging whether the residual molten iron amount is larger than a molten iron residual standard or not;
and the time determining module is used for determining the tapping time of the next furnace according to the second predicted total molten iron, the actual total molten iron and the average flow rate of molten iron.
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