CN110331257A - The design method of side-blown air pressure gun parameter in a kind of AOD refinery practice - Google Patents
The design method of side-blown air pressure gun parameter in a kind of AOD refinery practice Download PDFInfo
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- CN110331257A CN110331257A CN201910486525.3A CN201910486525A CN110331257A CN 110331257 A CN110331257 A CN 110331257A CN 201910486525 A CN201910486525 A CN 201910486525A CN 110331257 A CN110331257 A CN 110331257A
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- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
Abstract
The present invention relates to a kind of design methods of side-blown air pressure gun parameter in AOD refinery practice, belong to liquid steel refining technical field.Technical solution is: the air supply intensity of side-blown air pressure gun is controlled in 1.0-1.5m3/t/min；After the maximum stream flow for determining side-blown air pressure gun, circular is for example following: first determining the downstream pressure and flow velocity of central tube, carries out the selection of cross air blasting gun number and center internal diameter of copper pipe, again then to ensure that side-blown air pressure gun meets the requirement of maximum stream flow；Select side-blown air pressure gun protection air cooling mode and circumferential weld width, area.The invention has the advantages that: AOD furnace age is improved, shorten AOD smelting cycle, reduces AOD fuel ferrosilicon and slag charge lime, fluorite consumption.
Description
Technical field
The present invention relates to a kind of design methods of side-blown air pressure gun parameter in AOD refinery practice, belong to liquid steel refining technology neck
Domain.
Background technique
AOD refinery practice is that the mixed gas of oxygen and inert gas (argon gas, nitrogen) is straight by air pressure gun from furnace body side
It connecing to be blown among molten bath (under liquid level) and be refined, the annular air pressure gun (spray gun) of use is the important equipment of AOD refinery practice,
The center of annular air pressure gun is center copper pipe, is the cooling circumferential weld of annular between center copper pipe and housing, side-blown by evenly distributing
Protection air-flow Ar, N2 of air pressure gun, reaches the uniform cooling of air pressure gun, and the unlikely damage because of individual air pressure guns causes resistance to around air pressure gun
Material blowing out by serious melting loss；The internal diameter parameter of center copper pipe determines maximum air supply intensity (the O2+ inert gas needed for smelting
Ar, N2).The air pressure gun parameter designing of prior art is unreasonable, is easy to cause the resistance to material around air pressure gun by melting loss, and smelting cycle is long,
Thermal loss is big, and the consumption of fuel ferrosilicon and slag charge lime is caused to increase.
Summary of the invention
It is an object of the present invention to provide a kind of design methods of side-blown air pressure gun parameter in AOD refinery practice, improve AOD furnace age,
Shorten AOD smelting cycle, reduces AOD fuel ferrosilicon and slag charge lime, fluorite consumption, solve above-mentioned technology existing for prior art
Problem
Technical scheme is as follows:
The design method of side-blown air pressure gun parameter in a kind of AOD refinery practice, comprising the following steps:
1. the selection of side-blown air pressure gun air supply intensity: the air supply intensity of side-blown air pressure gun is controlled in 1.0-1.5m3/t/min；
2. the selection of cross air blasting gun number and the selection of center internal diameter of copper pipe:
After the maximum stream flow for determining side-blown air pressure gun, circular is for example following: first determining the downstream pressure and stream of central tube
Then speed carries out the selection of cross air blasting gun number and center internal diameter of copper pipe again, to ensure that side-blown air pressure gun meets wanting for maximum stream flow
It asks:
Q=D/2/1000×D/2/1000×3.14×10×P×U×N×60
Q: the maximum stream flow (m3/min) of more air pressure gun central gas streams
D: center internal diameter of copper pipe (mm)
P: enter central tube air-flow, regulating valve downstream pressure (MPa)
U: enter central tube air-flow, flow velocity (m/s) after regulating valve valve
N: cross air blasting gun number
3. side-blown air pressure gun protection air cooling mode and circumferential weld width, area:
A, the cooling control system of every air pressure gun uses independent control, independent regulating valve is provided with, with every wind of absolute guarantee
The cooling tolerance that rifle enters is absolutely identical, prevents inhomogeneous cooling, can guarantee the uniform erosion of the resistance to material of AOD in this way, avoid office
It damages and blowing out in portion；
B, cooling air circumferential weld width and area
Cooling air circumferential weld width: 1≤d/h≤2 wherein: d: the wall thickness (mm) of center copper pipe；H: cooling air circumferential weld width (mm)；
Cooling air circumferential weld area: 1≤S/F≤3 wherein: S: the cross section (mm2) of center copper pipe；F: the cross section (mm of circumferential weld
2).
The length of side-blown air pressure gun selects: the selection of air pressure gun length is mainly the length decision according to the molten bath AOD brick.Individual steel
Factory in order to improve furnace life, lengthening its length consciously, but the effect in will not generally being expected.Its reason is mainly wind
After rifle lengthens, if upstream pressure cannot be improved significantly, the pressure that will result in air pressure gun exit is not reached requirement, and is caused
There is interval and sprays into air-flow, to be unable to effective protection air pressure gun；According to data introduction, circumferential weld gas outlet pressure must not be lower than ring
, otherwise there is intermittent air flow in 1.9 times of border pressure.If improving upstream pressure simply, gas energy consumption will increase, cost will increase
Add, thus length should not lengthen simply, should mainly start with from design parameter.
The selection requirement of opposite side wind blowing gun:
A, 18mm is not to be exceeded in single air pressure gun center copper pipe maximum inner diameter, and air-flow is otherwise be easy to cause to be directed through molten bath, gas
Utilization rate decline；It is easy to cause the melting loss of resistance to material on air pressure gun opposite simultaneously；
B, air pressure gun number is typically chosen 3,5,7,9, convenient for the arrangement of air pressure gun and the stirring in molten bath；
C, into central tube air-flow, regulating valve downstream pressure can be calculated according to 1.4-1.5MPa；Upstream pressure need to guarantee
2.0MPa or more must not be lower than 1.6MPa, unlikely to guarantee that the pressure at side-blown air pressure gun central air outlet is not less than 0.3MPa
Rifle is blocked up in being formed；
D, into central tube air-flow, flow velocity can be calculated by 120-130m/s after regulating valve valve；Gas flow rate before valve designs
50m/s。
The invention has the advantages that:
1, shorten smelting cycle: increasingly important particularly with long process Stainless Steel Plant.For example blast furnace+AOD furnace production 200 is stainless
Steel or mineral hot furnace+AOD furnace production 300 are stainless steel mode.Its productive prospecting be it is uninterrupted, cannot be because of local process system
Production procedure divergence is about caused, these processes belong to mass production procedure, are not equal to electric furnace+AOD furnace short route
Production model.Thus require the rhythm of production of AOD that there must be certain elasticity, to meet the needs of production.In side-blown air pressure gun
In design, it is necessary to which there are certain spaces.Although AOD top gun also has certain influence on smelting cycle, since top gun is only blown in master
The oxygen supply stage uses, and smelts the later period generally without coming into operation, and the key link that can restrict smelting cycle is later period decarburization,
Thus the design of side-blown air pressure gun is most important.From the design parameter of air pressure gun, be mainly manifested in center internal diameter of copper pipe design and
In the selection of number；
2, improve AOD furnace age: China's AOD furnace age is generally lower at this stage, and AOD furnace age of the nominal capacity less than 100 tons generally exists
80-90 furnace, 100-120 tons of AOD furnace age also with regard to 120-130 furnace, also rarely exceed 200 furnaces for biggish stove.Such feelings
Under condition, it will cause and frequently replace furnace body, effective performance of a full set of process of restriction, that is, production efficiency are lower, and worker's labour is strong
Degree is big.It, mainly should be real in every air pressure gun protection air-flow in the parameter and layout designs of air pressure gun in order to improve the AOD service life
Row individually control, that is, a gas flow regulating valve is respectively configured, it is obtained with realizing protection air-flow on each air pressure gun
Even distribution.China AOD service life is relatively low, and main cause is exactly no independent control.The followed by width and area design of circumferential weld, when
So this is not main reason.Besides upstream pressure must assure that, if protection gas upstream pressure cannot be guaranteed, will cause
The intermittent penetrating of protection air-flow；If oxygen pressure is low, the shortening of exit oxygen jet core segment, oxygen reaction zone will cause
It concentrates at the resistance to material around air pressure gun, causes the resistance to serious melting loss of material in part；
3, AOD smelting cost: effective control of smelting cycle is reduced, heat loss can be significantly reduced, reduces fuel ferrosilicon and slag
The consumption of work stone ash, fluorite.Calculated according to 60 tons of AOD furnaces, the duration of heat shortens 10 minutes, and cooling is counted according to 6 ° per minute
It calculates, can about reduce by 1% chromium oxidation, ton steel can save 5 kilograms of ferrosilicon, 20 kilograms of lime, 3 kilograms of fluorites, and benefit very may be used
It sees.
Specific embodiment
Below by embodiment, the present invention will be further described in detail.
The design method of side-blown air pressure gun parameter in a kind of AOD refinery practice, comprising the following steps:
1. the selection of side-blown air pressure gun air supply intensity: the air supply intensity of side-blown air pressure gun is controlled in 1.0-1.5m3/t/min.
Need to specifically consider entire process flow layout, be related to the electric furnace to match with AOD furnace, blast furnace, mineral hot furnace and
The production capacity of conticaster.It is produced if necessary to fast pace, the upper limit may be selected in air supply intensity, conversely, lower limit may be selected.
2. the selection of cross air blasting gun number and the selection of center internal diameter of copper pipe:
After the maximum stream flow for determining side-blown air pressure gun, circular is for example following: first determining the downstream pressure and stream of central tube
Then speed carries out the selection of cross air blasting gun number and center internal diameter of copper pipe again, to ensure that side-blown air pressure gun meets wanting for maximum stream flow
It asks:
Q=D/2/1000×D/2/1000×3.14×10×P×U×N×60
Q: the maximum stream flow (m3/min) of more air pressure gun central gas streams
D: center internal diameter of copper pipe (mm)
P: enter central tube air-flow, regulating valve downstream pressure (MPa)
U: enter central tube air-flow, flow velocity (m/s) after regulating valve valve
N: cross air blasting gun number
The requirement of opposite side wind blowing gun:
A, 18mm is not to be exceeded in single air pressure gun center copper pipe maximum inner diameter, and air-flow is otherwise be easy to cause to be directed through molten bath, gas
Utilization rate decline；It is easy to cause the melting loss of resistance to material on air pressure gun opposite simultaneously；
B, air pressure gun number is typically chosen 3,5,7,9, convenient for the arrangement of air pressure gun and the stirring in molten bath；
C, into central tube air-flow, regulating valve downstream pressure can be calculated according to 1.4-1.5MPa；Upstream pressure need to guarantee
2.0MPa or more must not be lower than 1.6MPa, unlikely to guarantee that the pressure at side-blown air pressure gun central air outlet is not less than 0.3MPa
Rifle is blocked up in being formed；
D, into central tube air-flow, flow velocity can be calculated by 120-130m/s after regulating valve valve；Gas flow rate before valve designs
50m/s；
3. side-blown air pressure gun protection air cooling mode and circumferential weld width, area:
The uniform cooling of cooling air improves lining durability for the side-blown air pressure gun of effective protection, protects gas (Ar/N) to central gas stream
(O2) uniformly cool down is most important, and the relatively low major reason of domestic AOD furnace age is exactly the uneven of more side-blown air pressure guns
Cooling, the cooling of individual air pressure gun undercoolings, local air pressure gun is again on the weak side, and then causes the resistance to material in local air pressure gun region by high temperature
Oxygen seriously washes away, and is forced blowing out.For the enterprise of long process production stainless steel, causes frequently to replace furnace body, make to give birth to
It produces order and is difficult to tissue, while increasing the labor intensity of worker.
It is found after conscientious comparative analysis, the air pressure gun of domestic overwhelming majority enterprise is cooling using a regulating valve
The cooling of more air pressure guns of whole control, will cause that air pressure gun inhomogeneous cooling is even in this way, and principle is the adjusting due to controlling cooling air
Every air pressure gun after valve, pipe-line layout are bound to cause to actually enter each branch air pressure gun inlet there are the difference of the pressure loss
Pressure cooling medium, assignment of traffic it is uneven, thus form cooling uneven.
A, the cooling control system of every air pressure gun uses independent control method, independent regulating valve is provided with, with absolute
The cooling tolerance for guaranteeing that every air pressure gun enters is absolutely identical, prevents inhomogeneous cooling, can guarantee uniformly invading for the resistance to material of AOD in this way
Erosion avoids part from damaging and blowing out.The main reason for AOD furnace age is relatively low is the melting loss of the resistance to material in air pressure gun region, as long as can be effective
Air pressure gun region is controlled, furnace life is expected to increase substantially.
B, cooling air circumferential weld width and area
Cooling air circumferential weld width: 1≤d/h≤2 wherein: d: the wall thickness (mm) of center copper pipe；H: cooling air circumferential weld width (mm)；
Cooling air circumferential weld area: 1≤S/F≤3 wherein: S: the cross section (mm2) of center copper pipe；F: the cross section (mm of circumferential weld
2)；
Circumferential weld width and area are less than normal, and it is on the weak side to will cause cooling；Width and area are bigger than normal, will cause the waste of cooling air, and
Undercooling hinders the penetrating of oxygen jet, will lead to the reversed penetrating of oxygen under serious conditions, directly washes away around spray gun
Resistance to material.
4. the length of side-blown air pressure gun selects
The selection of air pressure gun length is mainly the length decision according to the molten bath AOD brick.Individual steel mills are in order to improve furnace life, intentionally
Know and lengthen its length, but the effect in will not generally being expected.Its reason is mainly after air pressure gun lengthens, if upstream pressure obtains
It is improved less than apparent, the pressure that will result in air pressure gun exit does not reach requirement, and causes air-flow interval occur and sprays into, thus not
It can effective protection air pressure gun；According to data introduction, circumferential weld gas outlet pressure must not be lower than 1.9 times of environmental pressure, otherwise occur
Intermittent air flow.If improving upstream pressure simply, gas energy consumption will increase, cost just will increase, thus length should not add simply
It is long, it should mainly start with from design parameter.
Embodiment one: 10 tons of AOD furnaces of certain factory, side-blown air pressure gun use 3 internal diameter of copper pipe D:8mm, copper pipe wall thickness d:
1mm, circumferential weld width h:0.5mm, oxygen supply intensity 10m3/ point, upstream pressure require 1.6MPa, downstream pressure 1.0MPa, and air pressure gun is cold
But body structure is robbed using single regulating valve three air pressure guns of centralized control, furnace life is generally in 30 furnaces or so.It is analyzed by calculating
Out:
Central tube cross-sectional area S:50.24mm2；Circumferential weld cross-sectional area F:16.49mm2；S/F=3.05 d/h=2.0；
Often occurs the resistance to material in local air pressure gun region in use by serious melting loss, reason is precisely due to cooling system is adopted
With single regulating valve centralized control, lead to the cooling wretched insufficiency of local air pressure gun；Secondly because circumferential weld width is 0.5mm, rifle mistake processed
The supporting point of outer layer stainless steel tube is not easy to control in journey, is easy to train off, it is even to cause inhomogeneous cooling.
Solves above-mentioned technical problem using two internal diameter of copper pipe in the spray gun of 10-11mm using the present invention.
Embodiment two: 20 tons of AOD furnaces of certain factory, side-blown air pressure gun use 3 internal diameter of copper pipe D:14mm, copper pipe wall thickness d:
1.5mm, circumferential weld width h:1.0mm, oxygen supply intensity 30m3/ point, upstream pressure require 1.8MPa, downstream pressure 0.80-1.0MPa,
Air pressure gun is cooling to rob body structure using single regulating valve three air pressure guns of centralized control, and furnace life is generally in 30-40 furnace or so.By meter
Point counting analysis obtains: central tube cross-sectional area S:153.86mm2；Circumferential weld cross-sectional area F:56.52mm2；S/F=2.72 d/h=1.5；
Cooling parameter selection meets the requirements, and mainly center internal diameter of copper pipe selection is bigger than normal, causes downstream pressure obviously relatively low, air pressure gun
Exit flow middle section shortens, and oxygen reaction zone concentrates on the resistance to material region around air pressure gun, thus causes furnace life lower；Simultaneously
There is also the even problems of the inhomogeneous cooling of local air pressure gun.
Using the present invention, internal diameter of copper pipe is selected in three air pressure guns of 11-12mm, solves above-mentioned technical problem.
Embodiment three: 60 tons of AOD furnaces of certain factory, side-blown air pressure gun use 3 internal diameter of copper pipe D:16mm, copper pipe wall thickness d:
1.0mm, circumferential weld width h:1.0mm, oxygen supply intensity 60m3/ point, upstream pressure require 2.0MPa, downstream pressure 1.3-1.5MPa,
Air pressure gun is cooling to use decentralised control, and the cooling of every air pressure gun is respectively carried out cooling robbing body knot by the regulating valve of an independent control
Structure, furnace life is generally in 100 furnaces or so.It is obtained by calculating analysis:
Central tube cross-sectional area S:200.96mm2；Circumferential weld cross-sectional area F:59.66mm2；S/F=3.37 d/h=1.0
Although intensity of cooling seems on the weak side, but due to cooling system independent control, cooling air is absolutely equal in the distribution of every air pressure gun
Even, so that every air pressure gun is evenly cooled, avoiding the resistance to material in part leads to serious melting loss due to inhomogeneous cooling.Shortcoming
It is since inner diameter of centerpipe is larger, stove nominal capacity is less than normal, and causes the resistance to material in air pressure gun opposite vulnerable to melting loss.
Using the present invention, the spray gun structure for the use of 5 internal diameter of copper pipe being 13mm, solves the above problem.
Claims (2)
1. the design method of side-blown air pressure gun parameter in a kind of AOD refinery practice, it is characterised in that the following steps are included:
The following steps are included:
1. the selection of side-blown air pressure gun air supply intensity: the air supply intensity of side-blown air pressure gun is controlled in 1.0-1.5m3/t/min；
2. the selection of cross air blasting gun number and the selection of center internal diameter of copper pipe:
After the maximum stream flow for determining side-blown air pressure gun, circular is for example following: first determining the downstream pressure and stream of central tube
Then speed carries out the selection of cross air blasting gun number and center internal diameter of copper pipe again, to ensure that side-blown air pressure gun meets wanting for maximum stream flow
It asks:
Q=D/2/1000×D/2/1000×3.14×10×P×U×N×60
Q: the maximum stream flow (m3/min) of more air pressure gun central gas streams
D: center internal diameter of copper pipe (mm)
P: enter central tube air-flow, regulating valve downstream pressure (MPa)
U: enter central tube air-flow, flow velocity (m/s) after regulating valve valve
N: cross air blasting gun number
3. side-blown air pressure gun protection air cooling mode and circumferential weld width, area:
A, the cooling control system of every air pressure gun uses independent control, independent regulating valve is provided with, with every wind of absolute guarantee
The cooling tolerance that rifle enters is absolutely identical, prevents inhomogeneous cooling, can guarantee the uniform erosion of the resistance to material of AOD in this way, avoid office
It damages and blowing out in portion；
B, cooling air circumferential weld width and area
Cooling air circumferential weld width: 1≤d/h≤2 wherein: d: the wall thickness (mm) of center copper pipe；H: cooling air circumferential weld width (mm)；
Cooling air circumferential weld area: 1≤S/F≤3 wherein: S: the cross section (mm2) of center copper pipe；F: the cross section (mm of circumferential weld
2).
2. the design method of side-blown air pressure gun parameter in a kind of AOD refinery practice according to claim 1, it is characterised in that right
The selection requirement of side-blown air pressure gun:
A, 18mm is not to be exceeded in single air pressure gun center copper pipe maximum inner diameter, and air-flow is otherwise be easy to cause to be directed through molten bath, gas
Utilization rate decline；It is easy to cause the melting loss of resistance to material on air pressure gun opposite simultaneously；
B, air pressure gun number is typically chosen 3,5,7,9, convenient for the arrangement of air pressure gun and the stirring in molten bath；
C, into central tube air-flow, regulating valve downstream pressure can be calculated according to 1.4-1.5MPa；Upstream pressure need to guarantee
2.0MPa or more must not be lower than 1.6MPa, unlikely to guarantee that the pressure at side-blown air pressure gun central air outlet is not less than 0.3MPa
Rifle is blocked up in being formed；
D, into central tube air-flow, flow velocity can be calculated by 120-130m/s after regulating valve valve；Gas flow rate before valve designs
50m/s。
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| CN104152634A (en) * | 2014-08-06 | 2014-11-19 | 邢台钢铁有限责任公司 | Method for stably controlling temperature in smelting process of AOD (argon oxygen decarburization) furnace |
| CN107908202A (en) * | 2017-10-27 | 2018-04-13 | 中冶华天南京电气工程技术有限公司 | A kind of AOD furnace cross air blasting gun pipe ring stitches flow control methods |
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2019
- 2019-06-05 CN CN201910486525.3A patent/CN110331257B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4405365A (en) * | 1982-08-30 | 1983-09-20 | Pennsylvania Engineering Corporation | Method for the fabrication of special steels in metallurgical vessels |
| CN101838719A (en) * | 2009-03-20 | 2010-09-22 | 宝山钢铁股份有限公司 | Air flow adjustment method of air gun for controlling accretion oxide of AOD furnace |
| CN103014238A (en) * | 2011-09-21 | 2013-04-03 | 宝山钢铁股份有限公司 | AOD converter side blowing gun pipeline system flow control method |
| CN202989202U (en) * | 2012-12-07 | 2013-06-12 | 广东华鳌合金新材料有限公司 | Improved gas supply gun for AOD (argon oxygen decarburization) furnace |
| CN104152634A (en) * | 2014-08-06 | 2014-11-19 | 邢台钢铁有限责任公司 | Method for stably controlling temperature in smelting process of AOD (argon oxygen decarburization) furnace |
| CN107908202A (en) * | 2017-10-27 | 2018-04-13 | 中冶华天南京电气工程技术有限公司 | A kind of AOD furnace cross air blasting gun pipe ring stitches flow control methods |
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