CN118166174A - Automatic converter mouth brushing control method and system for converter - Google Patents
Automatic converter mouth brushing control method and system for converter Download PDFInfo
- Publication number
- CN118166174A CN118166174A CN202410428464.6A CN202410428464A CN118166174A CN 118166174 A CN118166174 A CN 118166174A CN 202410428464 A CN202410428464 A CN 202410428464A CN 118166174 A CN118166174 A CN 118166174A
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- 230000001680 brushing effect Effects 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 41
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 299
- 239000001301 oxygen Substances 0.000 claims abstract description 299
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 295
- 238000007664 blowing Methods 0.000 claims abstract description 92
- 238000010926 purge Methods 0.000 claims abstract description 18
- 230000002045 lasting effect Effects 0.000 claims description 27
- 238000005507 spraying Methods 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 6
- 230000001133 acceleration Effects 0.000 claims description 4
- 238000009529 body temperature measurement Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 abstract description 36
- 238000004140 cleaning Methods 0.000 abstract description 12
- 230000036284 oxygen consumption Effects 0.000 abstract description 6
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4693—Skull removal; Cleaning of the converter mouth
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The embodiment of the invention provides a control method and a control system for an automatic furnace mouth brushing of a converter, and relates to the technical field of furnace mouth brushing and protecting of converters. Aims to solve the problems that the cleaning mode of the slag adhering at the mouth of the converter is time-consuming and has larger potential safety hazard. The automatic furnace mouth brushing control method of the converter comprises the steps of obtaining the diameter of a furnace mouth; according to the diameter of the furnace mouth, controlling the oxygen lance to purge the furnace mouth in stages, and controlling the brushing furnace mouth lance position, oxygen blowing flow and oxygen blowing time of the oxygen lance in each stage; wherein the oxygen blowing flow rate of each stage is in the range of 32000 3/h to 38000m 3/h, and the oxygen lance is a 6-hole oxygen lance. The automatic converter mouth brushing system of the converter is used for implementing the method. The corresponding oxygen-generating lance position is automatically selected according to the slag-forming conditions of different converter mouths, so that the oxygen-generating operation of the brush-burner mouths is standardized, the labor intensity of workers is reduced, the oxygen-generating time of the brush-burner mouths is shortened, the oxygen consumption is saved, and the maintenance of the furnace is more stable.
Description
Technical Field
The invention relates to the technical field of converter mouth brushing and furnace protection, in particular to a method and a system for controlling automatic mouth brushing of a converter.
Background
The splashing is an unavoidable problem in converter steelmaking, particularly the splashing slag adheres to the mouth of the converter, so that the diameter of the mouth of the converter is continuously reduced, and the operations of adding molten iron, adding scrap steel and the like of the converter are seriously affected to be smoothly carried out; meanwhile, the diameter of the converter mouth is reduced, so that the discharge of converter smoke is affected, and the occurrence of splashing is further aggravated.
Currently, each large steel plant adopts two modes to clean the slag at the converter mouth, wherein the two modes comprise: cleaning converter mouth slag adhering by adopting a dismantling furnace vehicle and purging the converter mouth slag adhering by adopting an oxygen lance; however, the furnace mouth slag is cleaned by using a furnace disassembly vehicle, manual cleaning is adopted, the time is long, the production rhythm is influenced, the furnace mouth temperature is high, and long-time operation cannot be performed; the oxygen lance is used for blowing the slag at the furnace mouth, and oxygen is blown to blow the slag at the furnace mouth of the converter, so that the operation is simple, the effect is obvious, but the oxygen lance is manually controlled by manpower, and the phenomenon of flue leakage is easy to occur due to improper use of the lance position of the oxygen lance, so that serious potential safety hazard exists.
Disclosure of Invention
The invention aims to provide a converter automatic brushing furnace mouth control method, which can solve the problems that a converter mouth slag sticking cleaning mode is time-consuming and has great potential safety hazards.
The invention further aims to provide an automatic converter mouth brushing system for the converter, which can solve the problems that a converter mouth slag sticking cleaning mode is time-consuming and potential safety hazards are large.
Embodiments of the invention may be implemented as follows:
The embodiment of the invention provides a control method for automatically brushing a furnace mouth of a converter, which comprises the following steps:
Obtaining the diameter of a furnace mouth;
Judging whether the furnace mouth type belongs to a first furnace mouth type, a second furnace mouth type or a third furnace mouth type according to the furnace mouth diameter, controlling an oxygen lance to purge different furnace mouth types in stages, and controlling a furnace mouth brushing gun position, oxygen blowing flow and oxygen blowing time of the oxygen lance in each stage;
Wherein the range of the furnace mouth diameter R1 of the first furnace mouth type is 2.8m < R1 < 3.2m; the diameter R2 of the second furnace mouth type is in the range of 2.6m < R2 < 2.8m; the diameter R3 of the third furnace mouth type is in the range of R3<2.6m; the furnace mouth diameter R1 of the first furnace mouth type is larger than the furnace mouth diameter R2 of the second furnace mouth type and larger than the furnace mouth diameter R3 of the third furnace mouth type; the oxygen blowing flow rate of each stage ranges from 32000 3/h to 38000m 3/h, the total oxygen blowing time of all stages ranges from 25s to 120s, and the oxygen lance is a 6-hole oxygen lance.
In addition, the automatic converter mouth brushing control method provided by the embodiment of the invention can also have the following additional technical characteristics:
Optionally, the step of determining, according to the furnace mouth diameter, that the furnace mouth type belongs to the first furnace mouth type, the second furnace mouth type or the third furnace mouth type, controlling the oxygen lance to purge different furnace mouth types in stages, and controlling a brushing furnace mouth lance position, an oxygen blowing flow rate and an oxygen blowing time of the oxygen lance in each stage includes:
Under the condition that the furnace mouth type belongs to the first furnace mouth type, in the first stage, controlling the oxygen lance position to move to 18800mm, adjusting the oxygen flow to 35500m 3/h, entering the second stage after lasting for 10s, controlling the oxygen lance position to move to 19500mm, adjusting the oxygen flow to 35500m 3/h, entering the third stage after lasting for 15s, controlling the oxygen lance position to move to 20000mm, adjusting the oxygen flow to 35500m 3/h, finishing brushing the furnace mouth after lasting for 15s, and automatically moving the oxygen lance to the waiting position of 18800mm.
Optionally, the step of determining, according to the furnace mouth diameter, that the furnace mouth type belongs to the first furnace mouth type, the second furnace mouth type or the third furnace mouth type, controlling the oxygen lance to purge different furnace mouth types in stages, and controlling a brushing furnace mouth lance position, an oxygen blowing flow rate and an oxygen blowing time of the oxygen lance in each stage further includes:
Under the condition that the furnace mouth type belongs to the second furnace mouth type, in the first stage, controlling the oxygen lance position to move to 18600mm, adjusting the oxygen flow to 35500m 3/h, entering the second stage after lasting for 10s, controlling the oxygen lance position to move to 19500mm, adjusting the oxygen flow to 35500m 3/h, entering the third stage after lasting for 35s, controlling the oxygen lance position to move to 20000mm, adjusting the oxygen flow to 35500m 3/h, finishing brushing the furnace mouth after lasting for 35s, and automatically moving the oxygen lance to a waiting position of 18800mm.
Optionally, the step of determining, according to the furnace mouth diameter, that the furnace mouth type belongs to the first furnace mouth type, the second furnace mouth type or the third furnace mouth type, controlling the oxygen lance to purge different furnace mouth types in stages, and controlling a brushing furnace mouth lance position, an oxygen blowing flow rate and an oxygen blowing time of the oxygen lance in each stage further includes:
under the condition that the fire hole type belongs to the third fire hole type, in the first stage, controlling the oxygen lance position to move to 18650mm, adjusting the oxygen flow to 35500m3/h, entering the second stage after lasting for 40s, controlling the oxygen lance position to move to 19500mm, adjusting the oxygen flow to 35500m3/h, entering the third stage after lasting for 40s, controlling the oxygen lance position to move to 20000mm, adjusting the oxygen flow to 35500m3/h, finishing brushing the fire hole after lasting for 40s, and automatically moving the oxygen lance to a waiting position of 18800mm.
Optionally, the length of the oxygen lance is 23125mm, the diameter of the oxygen lance is 325mm, the center dip angle of the oxygen lance is 15.5 degrees, and the throat diameter phi of the oxygen lance is 40.3mm.
Optionally, the single hole depth of impact of the oxygen lanceThe impact depth h1=h×correction coefficient of the 6-hole oxygen lance;
Wherein: p is the use pressure, phi is the diameter of the throat, and H is the gun position; and taking a correction coefficient of 0.90 for the 6-hole spray head.
Optionally, the effective impact area of the lance a=n×pi×d 2/4;
d＝1.26×(ρ/ρ0g)1/6×(vade)1/3×(H/B)1/2；
Wherein: n is the number of oxygen spraying holes, d is the single-hole impact diameter, ρ is the volume density of oxygen at the outlet of the oxygen spraying holes, ρ 0 is the volume density of oxygen at the inlet of the oxygen spraying holes, g is the gravity acceleration, v a is the outlet flow velocity 546.75m/s, d e is the throat radius of the oxygen spraying holes, H is the gun position of the oxygen gun operation, B is a constant, the Mach number is determined to be 0.5-3, and after the oxygen spraying holes are separated from the outlet 15de, B=6-9, and 7.86 is taken.
Optionally, the oxygen lance blows oxygen no more than 2 times per furnace steel; the duration of brushing the furnace mouth once per furnace is not more than 2 minutes.
Optionally, the step of judging whether the furnace mouth type belongs to the first furnace mouth type, the second furnace mouth type or the third furnace mouth type according to the furnace mouth diameter, controlling the oxygen lance to purge different furnace mouth types in stages, and controlling the brushing furnace mouth gun position, the oxygen blowing flow and the oxygen blowing time of the oxygen lance in each stage is performed in the sample waiting process after the temperature measurement and sampling of the blowing starting gun and the sublance TSO.
The embodiment of the invention also provides an automatic converter mouth brushing system of the converter. The automatic converter mouth brushing system comprises a video observation device, an oxygen gun and a controller, wherein the video observation device and the oxygen gun are connected with the controller, the video observation device is used for detecting the diameter of the converter mouth, the oxygen gun is used for blowing the converter mouth, and the controller is used for executing the automatic converter mouth brushing control method of the converter.
The automatic converter mouth brushing control method and system for the converter have the beneficial effects that:
The automatic furnace mouth brushing control method of the converter comprises the steps of obtaining the diameter of a furnace mouth; judging whether the furnace mouth type belongs to a first furnace mouth type, a second furnace mouth type or a third furnace mouth type according to the furnace mouth diameter, controlling an oxygen lance to purge different furnace mouth types in stages, and controlling a furnace mouth brushing gun position, oxygen blowing flow and oxygen blowing time of the oxygen lance in each stage; wherein the range of the furnace mouth diameter R1 of the first furnace mouth type is 2.8m < R1 < 3.2m; the diameter R2 of the second furnace mouth type is in the range of 2.6m < R2 < 2.8m; the diameter R3 of the third furnace mouth type is in the range of R3<2.6m; the furnace mouth diameter R1 of the first furnace mouth type is larger than the furnace mouth diameter R2 of the second furnace mouth type and larger than the furnace mouth diameter R3 of the third furnace mouth type; the oxygen blowing flow rate of each stage ranges from 32000 3/h to 38000m 3/h, the total oxygen blowing time of all stages ranges from 25s to 120s, and the oxygen lance is a 6-hole oxygen lance.
According to the slag-forming condition of the furnace mouth, the corresponding gun position of the furnace mouth brushing, oxygen blowing flow and oxygen blowing time are selected. The oxygen blowing operation of the furnace mouth is standardized, the labor intensity of workers is reduced, the oxygen blowing time of the furnace mouth is shortened, the oxygen consumption is saved, and the furnace maintenance is more stable.
The automatic converter mouth brushing system is used for implementing the method and can solve the problems that the cleaning mode of the converter mouth stuck slag is time-consuming and the potential safety hazard is large.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a nozzle mentioned in the method for controlling an automatic brushing mouth of a converter according to the present embodiment;
fig. 2 is a block diagram of a step of a first part of the automatic converter mouth brushing control method of the converter according to the embodiment;
Fig. 3 is a block diagram of a second part of the method for controlling the automatic brushing mouth of the converter according to the present embodiment.
Icon: 100-laryngeal inlet; 200-spraying holes; 300-center tilt angle.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship described in the drawings, or an azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
The automatic converter mouth brushing control method of the converter according to the present embodiment will be described in detail with reference to fig. 1 to 3.
Referring to fig. 1 and 2, an embodiment of the present invention provides a method for controlling an automatic brushing mouth of a converter, including:
Step S1, obtaining the diameter of a furnace mouth;
step S2, judging that the type of the furnace mouth belongs to a first furnace mouth type, a second furnace mouth type or a third furnace mouth type according to the diameter of the furnace mouth, controlling an oxygen lance to purge different furnace mouth types in stages, and controlling the brushing furnace mouth lance position, oxygen blowing flow and oxygen blowing time of the oxygen lance in each stage;
Wherein, the range of the furnace mouth diameter R1 of the first furnace mouth type is 2.8m < R1 < 3.2m; the diameter R2 of the second furnace mouth type is in the range of 2.6m < R2 < 2.8m; the diameter R3 of the third furnace mouth type ranges from R3<2.6m; the furnace mouth diameter R1 of the first furnace mouth type is larger than the furnace mouth diameter R2 of the second furnace mouth type and larger than the furnace mouth diameter R3 of the third furnace mouth type; the oxygen blowing flow rate of each stage is in the range of 32000 3/h to 38000m 3/h, the total oxygen blowing time of all stages is in the range of 25s to 120s, and the oxygen lance is a 6-hole oxygen lance.
Observing slag formation condition of a furnace mouth through a high-definition video, wherein the furnace mouth is large (R is more than 2.8 meters and less than or equal to 3.2 meters); the furnace mouth is normal (R is more than or equal to 2.6 meters and less than or equal to 2.8 meters); the furnace mouth is small (R is 2.6 m), and three modes of large furnace mouth, normal furnace mouth and small furnace mouth are selected on an operation picture. And selecting three modes of large furnace mouth, normal furnace mouth and small furnace mouth on an operation picture according to the slag accumulation amount.
The control mode of the corresponding furnace mouth type is selected according to different furnace mouth slagging conditions, and the corresponding oxygen lance position, time and flow rate are automatically selected, so that the automatic furnace mouth brushing and oxygen blowing operation is finished, the furnace mouth brushing operation is standardized, the manual furnace mouth brushing time can be shortened, the oxygen consumption is saved, and the furnace mouth maintenance is stable.
Referring to fig. 2 and 3, in the present embodiment, step S2, determining, according to a furnace mouth diameter, that a furnace mouth type belongs to a first furnace mouth type, a second furnace mouth type or a third furnace mouth type, controls an oxygen lance to purge different furnace mouth types in stages, and controls a brushing furnace mouth lance position, an oxygen blowing flow rate and an oxygen blowing time of the oxygen lance in each stage includes:
Step S21, under the condition that the fire hole type belongs to the first fire hole type, in the first stage, controlling the oxygen lance position to move to 18800mm, adjusting the oxygen flow to 35500m 3/h, entering the second stage after lasting 10S, controlling the oxygen lance position to move to 19500mm, adjusting the oxygen flow to 35500m 3/h, entering the third stage after lasting 15S, controlling the oxygen lance position to move to 20000mm, adjusting the oxygen flow to 35500m 3/h, finishing brushing the fire hole after lasting 15S, and automatically moving the oxygen lance to the waiting position of 18800mm. Wherein the range of the furnace mouth diameter R1 of the first furnace mouth type is 2.8m < R1 is less than or equal to 3.2m.
When the furnace mouth is of a large type (2.8 m < R is less than or equal to 3.2 m), according to the oxygen impact depth and impact area in the oxygen lance, when the oxygen lance height is in the range of 18800mm-20000mm, the impact depth and impact area can effectively cover the large type furnace mouth. The gun position, the oxygen flow and the oxygen blowing time in three stages can be controlled to ensure a good cleaning effect on a large-sized furnace mouth.
Referring to fig. 2 and 3, in the present embodiment, step S2, the step of determining, according to the furnace mouth diameter, whether the furnace mouth type belongs to the first furnace mouth type, the second furnace mouth type or the third furnace mouth type, controlling the oxygen lance to purge different furnace mouth types in stages, and controlling the brushing furnace mouth lance position, the oxygen blowing flow rate and the oxygen blowing time of the oxygen lance in each stage further includes:
Step S22, under the condition that the fire hole type belongs to the second fire hole type, in the first stage, controlling the oxygen lance position to move to 18600mm, adjusting the oxygen flow to 35500m 3/h, entering the second stage after lasting 10S, controlling the oxygen lance position to move to 19500mm, adjusting the oxygen flow to 35500m 3/h, entering the third stage after lasting 35S, controlling the oxygen lance position to move to 20000mm, adjusting the oxygen flow to 35500m 3/h, finishing brushing the fire hole after lasting 35S, and automatically moving the oxygen lance to a waiting position of 18800mm. Wherein the diameter R2 of the second furnace mouth type is in the range of 2.6m < R2.ltoreq.2.8 m.
When the furnace mouth is of a normal furnace mouth type (R is more than or equal to 2.6 meters and less than or equal to 2.8 meters), according to the oxygen impact depth and impact area in the oxygen lance, when the oxygen lance height is in the range of 18600mm-20000mm, the impact depth and impact area can effectively cover the furnace mouth of the normal type. The gun position, the oxygen flow and the oxygen blowing time in three stages can be controlled to ensure a good cleaning effect on a normal type furnace mouth.
Referring to fig. 2 and 3, in the present embodiment, step S2, the step of determining, according to the furnace mouth diameter, whether the furnace mouth type belongs to the first furnace mouth type, the second furnace mouth type or the third furnace mouth type, controlling the oxygen lance to purge different furnace mouth types in stages, and controlling the brushing furnace mouth lance position, the oxygen blowing flow rate and the oxygen blowing time of the oxygen lance in each stage further includes:
Step S23, under the condition that the fire hole type belongs to the third fire hole type, in the first stage, controlling the oxygen lance position to move to 18650mm, adjusting the oxygen flow to 35500m3/h, entering the second stage after lasting for 40S, controlling the oxygen lance position to move to 19500mm, adjusting the oxygen flow to 35500m3/h, entering the third stage after lasting for 40S, controlling the oxygen lance position to move to 20000mm, adjusting the oxygen flow to 35500m3/h, ending brushing the fire hole after lasting for 40S, and automatically moving the oxygen lance to a waiting position of 18800mm. The diameter R3 of the third furnace mouth type ranges from R3<2.6m.
When the slag formation of the furnace mouth is of a small type (the diameter R of the furnace mouth is less than 2.6 meters), according to the impact depth and the impact area of oxygen in the oxygen lance, when the height of the oxygen lance is in the range of 18650mm-20000mm, the impact depth and the impact area can effectively cover the small type furnace mouth. The gun position, the oxygen flow and the oxygen blowing time in three stages can be controlled to ensure a good cleaning effect on a small-sized furnace mouth.
Referring to FIG. 1, in this example, the length of the lance was 23125mm, the diameter of the lance was 325mm, the center tilt angle of the lance was 15.5℃and the throat diameter of the lance was 40.3mm.
Referring to fig. 1, the nozzle is provided with a throat 100 having a diameter phi and an orifice 200 having a center inclination 300 of 15.5 deg..
In this example, the single hole depth of impact of the lanceThe impact depth h1=h×correction coefficient of the 6-hole oxygen lance; wherein: p is the use pressure, phi is the diameter of the throat, and H is the gun position; and taking a correction coefficient of 0.90 for the 6-hole spray head.
Then: when the gun position is 1600mm during blowing, the impact depth h1=96.0 cm; when the gun position is 1800mm during converting, the impact depth h1=90.7 cm; the depth of impact h1=86.3 cm when the gun position during converting is 2000 mm.
In this example, the effective impact area of the lance, a=n×pi×d 2/4;
d＝1.26×(ρ/ρ0g)1/6×(vade)1/3×(H/B)1/2；
Wherein: n is the number of oxygen spraying holes, d is the single-hole impact diameter, ρ is the volume density of oxygen at the outlet of the oxygen spraying holes, ρ 0 is the volume density of oxygen at the inlet of the oxygen spraying holes, g is the gravity acceleration, v a is the outlet flow velocity 546.75m/s, d e is the throat radius of the oxygen spraying holes, H is the gun position of the oxygen gun operation, B is a constant, the Mach number is determined to be 0.5-3, and after the oxygen spraying holes are separated from the outlet 15de, B=6-9, and 7.86 is taken.
Impact area calculation, a) according to the isentropic flow function table: when ma=2.05, ρ/ρ 0 =0.2176, ma= 1.6553; wherein: the density Kg/m 3,ρ0 of the outlet oxygen of the p-oxygen injection hole, the density Kg/m 3,Ma* of the inlet oxygen of the oxygen injection hole and the flow rate coefficient of the outlet oxygen injection hole are calculated according to the isentropic flow function table.
B) Determination of outlet flow rate: v a is defined by the oxygen injection orifice outlet flow rate formula: v a = Ma x v = Ma x 19.07 x m/s, where: v a -outlet flow rate of oxygen spraying holes, m/s, v-sonic velocity of oxygen jet, m/s, T 0 -oxygen stagnation temperature K, wherein T 0 =273+ (20-30) K is generally selected according to local summer temperature, and T O =300K is selected: v a = 546.75m/s.
C) Determination of single hole impact diameter: d is represented by the formula of the outlet flow rate of the oxygen spraying holes: d=1.26× (ρ/ρ 0g)1/6×(vade)1/3×(H/B)1/2, where g-gravity acceleration, 9.81m/s2, d e -oxygen injection hole throat radius m, H-oxygen lance operating gun position m, B-constant, depending on the Mach number of the jet, mach number is 0.5-3, after exiting from outlet 15d e, B=6-9, taking 7.86. When the gun position during converting is 1600mm, single hole impact diameter d=0.671 m, when the gun position during converting is 1800mm, single hole impact diameter d=0.711 m, when the gun position during converting is 2000mm, single hole impact diameter d=0.750 m.
D) Determination of effective impact area: a is represented by the area formula: a=n×pi×d 2/4, where: n-number of oxygen spraying holes. Then: when the gun position is 1600mm during converting, the effective impact area A=2.122 m 2; when the gun position is 1800mm during converting, the effective impact area A=2.382 m 2; the effective impact area a= 2.651m 2 when the gun is positioned at 2000mm during converting.
In the embodiment, the oxygen lance blows oxygen for not more than 2 times per furnace steel; the duration of brushing the furnace mouth once per furnace is not more than 2 minutes. In this embodiment, the step of determining that the type of the fire hole belongs to the first fire hole type, the second fire hole type or the third fire hole type according to the fire hole diameter, controlling the oxygen lance to purge different fire hole types in stages, and controlling the brushing fire hole lance position, oxygen blowing flow and oxygen blowing time of the oxygen lance in each stage is performed in the sample waiting process after the temperature measurement and sampling of the blowing and lifting lance and the sublance TSO.
According to the automatic converter mouth brushing control method provided by the embodiment, the working principle of the automatic converter mouth brushing control method is as follows: according to the type of the furnace mouth formed by the slag bonding amount of the furnace mouth, the setting of the gun position of the oxygen gun of the furnace mouth, the setting of the oxygen blowing time of the oxygen gun and the setting of the oxygen flow rate are selected. Observing the slag-forming condition of the furnace mouth through a high-definition video, and judging the slag-forming type of the furnace mouth according to the diameter R of the furnace mouth of the converter: the furnace mouth is large (R1 is less than or equal to 3.2 m and is more than 2.8 m); the furnace mouth is normal (R2 is more than or equal to 2.6 meters and less than or equal to 2.8 meters); the furnace mouth is small (R3 is less than 2.6 m), and three modes of large furnace mouth, normal furnace mouth and small furnace mouth are selected on an operation picture. According to the angle of oxygen blowing of the 6-hole oxygen lance and the size of slag formation at the furnace mouth, the oxygen blowing angle and the slag formation size of the furnace mouth are set to be multi-section stepped lance position curves, the lance position of the furnace mouth brushing, the oxygen blowing flow and the oxygen blowing time are determined, 3 steps are set in total, and when the oxygen blowing time of the 3 rd step is finished, the furnace mouth brushing is completed, and the oxygen lance is automatically lifted to a waiting position of 18800mm. By setting the gun position and the furnace mouth position of the oxygen gun, the corresponding operation curve is selected, the automatic operation of the oxygen gun is realized, the gun position is changed to clean slag formation, and the oxygen flow of the oxygen gun in the oxygen flow setting step when the oxygen gun is used for blowing oxygen to treat the slag formation of the furnace mouth of the converter can be dynamically adjusted according to the site condition. Oxygen lance oxygen blowing is carried out for not more than 2 times per furnace steel and is carried out in a plurality of furnace times, the duration of brushing the furnace mouth for each furnace time is not more than 2 minutes, and oxygen is blown again at intervals of 5 seconds until the slag formation of the furnace mouth is completely cleaned. The operation of oxygen blowing and brushing the furnace mouth is carried out in the sample waiting process after the temperature measurement and sampling of the blowing and starting gun and the sublance TSO.
The operation steps of furnace brushing and furnace protecting are as follows: 1. leaving all or part of slag at the furnace mouth after the molten steel is completely discharged; 2. observing the thickness and temperature of slag, selecting the type of a furnace mouth in the picture setting of an upper computer, and determining the step flow of oxygen blowing, the step height of an oxygen lance and the step time of oxygen blowing; 3. shaking the furnace to a vertical position, and clicking an automatic furnace mouth brushing button on the picture; 4. the lance is put down to the set position of the oxygen lance in the first step of the curve, oxygen blowing and furnace mouth brushing are started, the lance is stopped at each set position, and oxygen blowing is carried out at the slag-bonding place of the furnace mouth of the converter; 5. oxygen blowing is carried out according to each sub-step until the oxygen blowing time of the step is set to zero, oxygen blowing is stopped, and an oxygen lance is lifted from the outside of the furnace to a waiting point; 6. checking the slag formation condition of the furnace mouth, and if the slag formation condition is still needed, blowing oxygen to brush the furnace mouth, if the slag formation condition is met, stopping the oxygen lance at a waiting point, and ending the furnace mouth brushing operation.
Example 1
When the converter mouth is less than 2600mm, slag formation is more and the condition is poor, and the small type of the converter mouth is selected. Because of poor furnace mouth conditions and more slag formation, the curves of the gun position of the furnace mouth brushing, the oxygen blowing flow and the oxygen blowing time are selected to be 18650mm,40s,35500m3/h in the first step, 19500mm,40s,35500m3/h in the second step and 20000mm,40s,35500m3/h in the third step. Specifically, after oxygen blowing, the oxygen lance is lifted to a waiting point, when the oxygen lance is lifted to 18650mm after steel tapping, the oxygen blowing flow is 35500m 3/h, the lance position is lifted back to 19500mm after 40 seconds, the lance position is lifted back to 20000mm after 40 seconds, the furnace mouth brushing is automatically stopped after 40 seconds, the lance position is lowered to the lance position waiting point 18600mm, the designed furnace mouth brushing oxygen blowing time is 120 seconds, the slag cleaning of the furnace mouth can be ensured, the automatic furnace brushing control can be finished manually and early when the furnace mouth is close to the end point as required, and the actual furnace mouth brushing time is 20 to 120 seconds. In the whole process of brushing the furnace to blow oxygen, the flow rate of blowing oxygen is controlled to be 32000-38000 m 3/h, after optimization, the flow rate is controlled to be 35500m 3/h, and the consumption of oxygen in the whole process of brushing the furnace mouth is 2500-3200 m 3.
Comparative example 1
When the state of brushing the furnace mouth is observed and the furnace mouth is small, the traditional method is that the pressure of the gun position is checked to 18800mm to blow oxygen for 30 seconds, then the gun is raised to 19100mm, the gun is pressed under the condition of blowing oxygen, the end point is lowered to 18800mm, the whole time for brushing the furnace mouth needs 120 seconds, the oxygen consumption is about 4000m 3 when the oxygen blowing flow is controlled to 48000m 3/h, and the automatic furnace mouth brushing control is shortened by about half a minute compared with the slag splashing time of manual experience slag splashing, and the oxygen is saved by about 800m 3.
In combination with example 1 and comparative example 1, example 1 has the following beneficial effects:
1. The automatic furnace mouth brushing and slag removing time is controllable and can not exceed 80 seconds, the total average furnace mouth brushing time is about 120 seconds, compared with the prior art, the slag splashing time is shortened by about 40 seconds, the oxygen consumption is reduced by about 400m 3 per furnace, the oxygen is saved by about 84 ten thousand m 3 per month in a steel-making 2100 furnace per month, and the oxygen cost is saved by about 30 ten thousand yuan per month.
2. The furnace mouth brushing time is shortened, the production rhythm is accelerated, the improvement of the yield is facilitated, the time saving of two furnace seats is on average per shift more than one furnace steel, two more furnace steel are needed a day, 60 more furnace steel are needed in a month accumulation, and the yield is increased by about 1.3 ten thousand tons.
3. The furnace type is convenient to maintain, and the change of the furnace type is realized by changing the automatic furnace mouth brushing control mode according to different maintenance requirements.
The automatic converter mouth brushing control method for the converter provided by the embodiment has at least the following advantages:
the oxygen lance is used for blowing oxygen to sweep slag at the converter mouth, the operation is simple, the effect is obvious, the phenomenon of leaking a flue is not easy to happen, and the safety is high.
According to different converter mouth slagging conditions, corresponding oxygen-forming gun oxygen-blowing gun positions are automatically selected, automatic furnace mouth brushing and slag removal operation is completed, so that the oxygen-blowing operation of the furnace mouth brushing is standardized, the labor intensity of workers is reduced, the oxygen-blowing time of the furnace mouth brushing is shortened, the oxygen consumption is saved, and the furnace maintenance is more stable.
By reasonably setting the gun position, working pressure, oxygen blowing flow and oxygen blowing time of the existing oxygen gun, the oxygen gun is used for blowing oxygen to treat converter mouth slag, so that the damage to converter equipment and a converter lining can be avoided. And compared with the treatment by a furnace disassembly machine, the method saves 25 min/time, greatly improves the production operation rate, and has the advantages of safety, rapidness, good slag-bonding cleaning effect and the like.
The embodiment of the invention also provides an automatic converter mouth brushing system of the converter. The automatic converter mouth brushing system comprises a video observation device, an oxygen gun and a controller, wherein the video observation device and the oxygen gun are connected with the controller, the video observation device is used for detecting the diameter of a converter mouth, the oxygen gun is used for blowing the converter mouth, and the controller is used for executing the automatic converter mouth brushing control method. Can solve the problems of time consumption and larger potential safety hazard of the converter mouth slag adhering cleaning mode.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The automatic converter mouth brushing control method is characterized by comprising the following steps of:
Obtaining the diameter of a furnace mouth;
Judging whether the furnace mouth type belongs to a first furnace mouth type, a second furnace mouth type or a third furnace mouth type according to the furnace mouth diameter, controlling an oxygen lance to purge different furnace mouth types in stages, and controlling a furnace mouth brushing gun position, oxygen blowing flow and oxygen blowing time of the oxygen lance in each stage;
Wherein the range of the furnace mouth diameter R1 of the first furnace mouth type is 2.8m < R1 < 3.2m; the diameter R2 of the second furnace mouth type is in the range of 2.6m < R2 < 2.8m; the diameter R3 of the third furnace mouth type is in the range of R3<2.6m; the furnace mouth diameter R1 of the first furnace mouth type is larger than the furnace mouth diameter R2 of the second furnace mouth type and larger than the furnace mouth diameter R3 of the third furnace mouth type; the oxygen blowing flow rate of each stage ranges from 32000 3/h to 38000m 3/h, the total oxygen blowing time of all stages ranges from 25s to 120s, and the oxygen lance is a 6-hole oxygen lance.
2. The automatic converter mouth brushing control method according to claim 1, characterized in that:
The step of judging whether the furnace mouth type belongs to the first furnace mouth type, the second furnace mouth type or the third furnace mouth type according to the furnace mouth diameter, controlling the oxygen lance to purge different furnace mouth types in stages, and controlling the brushing furnace mouth lance position, the oxygen blowing flow and the oxygen blowing time of the oxygen lance in each stage comprises the following steps:
Under the condition that the furnace mouth type belongs to the first furnace mouth type, in the first stage, controlling the oxygen lance position to move to 18800mm, adjusting the oxygen flow to 35500m 3/h, entering the second stage after lasting for 10s, controlling the oxygen lance position to move to 19500mm, adjusting the oxygen flow to 35500m 3/h, entering the third stage after lasting for 15s, controlling the oxygen lance position to move to 20000mm, adjusting the oxygen flow to 35500m 3/h, finishing brushing the furnace mouth after lasting for 15s, and automatically moving the oxygen lance to the waiting position of 18800mm.
3. The automatic converter mouth brushing control method according to claim 1, characterized in that:
The step of judging whether the furnace mouth type belongs to the first furnace mouth type, the second furnace mouth type or the third furnace mouth type according to the furnace mouth diameter, controlling the oxygen lance to purge different furnace mouth types in stages, and controlling the brushing furnace mouth lance position, the oxygen blowing flow and the oxygen blowing time of the oxygen lance in each stage comprises the following steps:
Under the condition that the furnace mouth type belongs to the second furnace mouth type, in the first stage, controlling the oxygen lance position to move to 18600mm, adjusting the oxygen flow to 35500m 3/h, entering the second stage after lasting for 10s, controlling the oxygen lance position to move to 19500mm, adjusting the oxygen flow to 35500m 3/h, entering the third stage after lasting for 35s, controlling the oxygen lance position to move to 20000mm, adjusting the oxygen flow to 35500m 3/h, finishing brushing the furnace mouth after lasting for 35s, and automatically moving the oxygen lance to a waiting position of 18800mm.
4. The automatic converter mouth brushing control method according to claim 1, characterized in that:
The step of judging whether the furnace mouth type belongs to the first furnace mouth type, the second furnace mouth type or the third furnace mouth type according to the furnace mouth diameter, controlling the oxygen lance to purge different furnace mouth types in stages, and controlling the brushing furnace mouth lance position, the oxygen blowing flow and the oxygen blowing time of the oxygen lance in each stage comprises the following steps:
under the condition that the fire hole type belongs to the third fire hole type, in the first stage, controlling the oxygen lance position to move to 18650mm, adjusting the oxygen flow to 35500m3/h, entering the second stage after lasting for 40s, controlling the oxygen lance position to move to 19500mm, adjusting the oxygen flow to 35500m3/h, entering the third stage after lasting for 40s, controlling the oxygen lance position to move to 20000mm, adjusting the oxygen flow to 35500m3/h, finishing brushing the fire hole after lasting for 40s, and automatically moving the oxygen lance to a waiting position of 18800mm.
5. The automatic converter mouth brushing control method according to any one of claims 1 to 4, characterized in that:
The length of the oxygen lance is 23125mm, the diameter of the oxygen lance is 325mm, the center dip angle of the oxygen lance is 15.5 degrees, and the throat diameter phi of the oxygen lance is 40.3mm.
6. The method for controlling the automatic brush furnace mouth of the converter according to claim 5, wherein:
single hole depth of impact of the oxygen lance The impact depth h1=h×correction coefficient of the 6-hole oxygen lance;
Wherein: p is the use pressure, phi is the diameter of the throat, and H is the gun position; and taking a correction coefficient of 0.90 for the 6-hole spray head.
7. The method for controlling the automatic brush furnace mouth of the converter according to claim 6, wherein:
the effective impact area of the oxygen lance is a=n×pi×d 2/4;
d＝1.26×(ρ/ρ0g)1/6×(vade)1/3×(H/B)1/2；
Wherein: n is the number of oxygen spraying holes, d is the single-hole impact diameter, ρ is the volume density of oxygen at the outlet of the oxygen spraying holes, ρ 0 is the volume density of oxygen at the inlet of the oxygen spraying holes, g is the gravity acceleration, v a is the outlet flow velocity 546.75m/s, d e is the throat radius of the oxygen spraying holes, H is the gun position of the oxygen gun operation, B is a constant, the Mach number is determined to be 0.5-3, and after the oxygen spraying holes are separated from the outlet 15de, B=6-9, and 7.86 is taken.
8. The automatic converter mouth brushing control method according to any one of claims 1 to 4, characterized in that:
the oxygen lance blows oxygen for not more than 2 times per furnace steel; the duration of brushing the furnace mouth once per furnace is not more than 2 minutes.
9. The automatic converter mouth brushing control method according to any one of claims 1 to 4, characterized in that:
The method comprises the steps of judging whether the furnace mouth type belongs to a first furnace mouth type, a second furnace mouth type or a third furnace mouth type according to the furnace mouth diameter, controlling an oxygen lance to purge different furnace mouth types in stages, and controlling the brushing furnace mouth gun position, oxygen blowing flow and oxygen blowing time of the oxygen lance in each stage, wherein the steps are carried out in a sample waiting process after temperature measurement and sampling of a blowing starting gun and a sublance TSO.
10. An automatic converter mouth brushing system is characterized by comprising a video observation device, an oxygen gun and a controller, wherein the video observation device and the oxygen gun are connected with the controller, the video observation device is used for detecting and obtaining the diameter of a mouth, the oxygen gun is used for blowing the mouth, and the controller is used for executing the automatic converter mouth brushing control method according to any one of claims 1-9.
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| CN202410428464.6A CN118166174A (en) | 2024-04-10 | 2024-04-10 | Automatic converter mouth brushing control method and system for converter |
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| CN202410428464.6A CN118166174A (en) | 2024-04-10 | 2024-04-10 | Automatic converter mouth brushing control method and system for converter |
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