CN104862444B - Method for preventing explosion venting of dry dedusting system of catch carbon converter - Google Patents
Method for preventing explosion venting of dry dedusting system of catch carbon converter Download PDFInfo
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- CN104862444B CN104862444B CN201510224461.1A CN201510224461A CN104862444B CN 104862444 B CN104862444 B CN 104862444B CN 201510224461 A CN201510224461 A CN 201510224461A CN 104862444 B CN104862444 B CN 104862444B
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Abstract
The invention discloses a method for preventing explosion venting of a dry dedusting system of a catch carbon converter, belongs to the technical field of dry dedusting of converters, and is used for preventing the dry dedusting system of the catch carbon converter from generating the explosion venting accident. The oxygen flow and the nitrogen blowing amount in the catch carbon operation are controlled, and the oxygen blowing amount mode is controlled according to the catch carbon content in secondary gun reblowing, so that the xplosion venting of the dry dedusting system of the catch carbon converter can be effectively prevented, the safety production is realized, the operability of the converter is improved, the production cost is reduced, and the molten steel quality is enhanced. Under the conditions of the dry dedusting technology, the target of stably producing low alloys (HRB400 series) and high-carbon steels (40-80#, 77B, 82B and the like) by the converter catch carbon method is realized.
Description
Technical field
The present invention relates to a kind of method being prevented from highcasting speed converter dry dust pelletizing system venting of dust explosion, belong to converter dry and remove
Dust collecting method technical field.
Background technology
The development producing with oxygen converter steelmaking and being gradually improved of process for making, dedusting technology is also evolving into
Ripe.The Recovery Purifying of oxygen converter steelmaking mainly has two methods, i.e. gas wet (og) and coal gas dry-method (lt), real producing
In trampling, the dust removing effects of gas wet (og) are incompatible with current environment protection related request, and coal gas dry-method (lt) is because can
So that dust concentration (standard state) directly can be down to by 10mg/m by electric cleaner3Hereinafter, its udst separation efficiency high and extensive
Application.
At present, converter dry dedusting technology has been identified as the developing direction in a period from now in the world, and it is permissible
Partially or completely compensate whole energy consumptions of convertor steelmaking process, realize the target of negative converter energy consumption steel-making.Meanwhile, it is from tighter
The environmental protection of lattice and power conservation requirement are seen, converter dry dust pelletizing system has more catered to the requirement of metallurgical industry sustainable development.
Converter smelting high-carbon steel has two ways according to the difference of carbon content of molten steel during tapping: one kind is highcasting speed method, and one
Planting is homlolgation.Highcasting speed method refers to that molten bath phosphorus content reaches when tapping requires stopping oxygen blast, now in molten bath not only sulfur phosphorus and
Temperature meets the requirements, and after counting the carbon that ferroalloy is brought in metal, the carbon in molten steel also can meet the specification in being made steel
Require.Compared with homlolgation tapping, the tapping of highcasting speed method has that duration of blast is short, oxygen consumption is few, the blow loss of ferrum is few, metal is received
The high advantage of rate, simultaneously slag the erosion of furnace lining is mitigated, can also have that carbon dust addition is few with prolonging furnace age, oxygen contains in steel
The low, alloy of amount consumes less, original field trash is less, that gas content is low, molten steel composition fluctuation is less etc. is excellent for the nitrogen in steel, hydrogen etc.
Point.But can cause electric precipitation that venting of dust explosion production accident frequently occurs using dry method dust in highcasting speed method converter producing, seriously
Disturb STEELMAKING PRODUCTION rhythm, destroy cleaner.Therefore home and abroad adopts the iron and steel enterprise of dry method dust all using carburetting
Method is smelted, and dry dedusting technology is restricted in highcasting speed method converter producing low-alloy and high-carbon steel application, no becomes at present
Ripe process and technology are avoiding highcasting speed method dry-dedusting system venting of dust explosion.
In existing patent documentation, China Patent Publication No. cn102952917a discloses in a kind of converter steelmaking process
Prevent the control method of dry-dedusting system venting of dust explosion, China Patent Publication No. cn101880744a discloses a kind of decarburization converter
The method that exhaust-gas treatment adopts dry dedusting technology electric precipitation not venting of dust explosion, China Patent Publication No. cn101619375a discloses one
The method planting preventing electric precipitation detonation discharge of top and bottom blown converter.However, these patent application publication are all mainly concentrated elaborates converter
Smelted using homlolgation, the using method of dry-dedusting system or how to prevent coal gas venting of dust explosion, for how preventing highcasting speed method
Converter dry dust pelletizing system venting of dust explosion is all not directed to.
The flue gas producing in converter steelmaking process is under being drawn of blower fan, cold through gasification cooling flue, vapotron
But to about 200 DEG C.Flue gas after cooling enters cylinder type electrostatic precipitator by pipeline, under electric field action, collects remaining
Fine dust.Co, o2 concentration in the purified gas that system detects according to gas analyser, by controlling switching station, realizes returning of coal gas
Receive or diffuse.System main composition specifically includes that gasification cooling flue 2, vapotron (ec) 3, electrostatic precipitation as shown in Figure 1
Device (ep) 4, blower fan 5, gas cooler (gc) 7, diffusion system 6 etc..
During top and bottom combined blown converter steelmaking, the molten iron in stove occurs violent chemical reaction to generate with the oxygen being blown into
Substantial amounts of high-temperature flue gas, with some inclusion of air of fire door, flue gas main component is co, co2、o2、n2, ar and dust etc..
Along with iron making, plus steel scrap, open blow, catch carbon, the operation such as re-blow, tap, dry-dedusting system is in coal gas and air all the time
Alternately flow, and have electrode discharge, as co >=9%, o in electrostatic precipitator again2When >=6%；And work as h2>=3%, 02>=2%
Shi Jun occurs venting of dust explosion.There is venting of dust explosion, gently then lead to the unplanned rifle that carries of oxygen rifle to cause STEELMAKING PRODUCTION to interrupt, serious venting of dust explosion can damage
Evil minus plate, the deformation of anode line, vibrated system and scraping machine, affect equipment normal work, cause converter to stop production, reduce converter
Operating rate, disturbs rhythm of production.
Carbon monoxide air nitrogen in " safe practice handbook "+carbon dioxide system blast is compiled according to day safety association
The ternary diagram of scope, is converted into carbon monoxide oxygen-nitrogen+carbon dioxide system explosive range ternary diagram.In ternary diagram
The enclosed region of luc is referred to as explosion triangle area, and the co concentration in this region is in the range of explosion limit, when running into high temperature heat source
Explode.The region that ufpc surrounds is referred to as Potential Area Of Danger, and the co concentration in this region is higher than the explosion ratio upper limit, but oxygen
Gas concentration is relatively low, and this region is also called oxygen concentration deficiency area, does not explode because oxygen deficiency runs into high temperature heat source.slcq
Enclosed region is comparatively safe area, and the co concentration in region is in below explosion ratio lower limit, due to not reaching explosion ratio pole
Limit and there is no explosivity.In order to control electrostatic precipitator venting of dust explosion, dry method dust design producer usually requires that converter tapping terminal
Control w(c) ＜ 0.15%.Be analyzed from venting of dust explosion mechanism in conjunction with Fig. 2, as molten steel w(c) be about 0.6% when, co:40%, o2:
When 0.5%, if converter directly adopts highcasting speed method, smoke components can be transitioned into composition of air along ab trend, if a catch carbon is complete
When needing to re-blow, smoke components penetrate into blast area along ba trend.From ternary map analysis, straight line ab is enclosed through luc
Blast area, flue gas causes venting of dust explosion through electrostatic precipitator electrode discharge.Reduce the venting of dust explosion of converter highcasting speed dry-dedusting system
Number of times, it is necessary to assure mixing gas component avoids the blast area that luc is surrounded, such as smoke components move towards along curve adb.To mixed
Close in flue gas and be filled with n2, the volume fraction of co, o2 and h2 can be effectively reduced, such as Fig. 3, ab composition is changed into a ' after being filled with nitrogen
B ', away from ab, if pour enough n2 can avoid explosion limit scope in mixed gas.
The oxygen blow duration of oxygen top and bottom combined blown converter steelmaking about more than ten minutes, slag making to be completed, decarburization, de- during this period
Phosphorus, desulfurization, degassing, the removal basic task such as non-metallic inclusion and intensification.At the blowing initial stage, molten iron temperature is relatively low, and decarburization is anti-
Should be suppressed, based on silicon, the oxidation of manganese, co and co2Content slowly rises.Blowing mid-term is carbon period, with temperature
Constantly raise and silicon, this oxidation of manganio are complete, carbon oxygen reacts rapidly, co and co2Content starts rapid increase, o in flue gas2Content is fast
Drop to less than 1% fastly.Blow the later stage, now carbon has dropped to less than 0.6%, reaction between carbon and oxygen speed is in slow downward trend.
From Fig. 4 converter decarburization curve, straight line l0 is co and co2 composition, l2 ＜ 0.15%, l1 ＞ 0.15% when 0.15% for carbon content.
Smelt low-alloy and during high-carbon steel, catch carbon and re-blowing under the conditions of l2, co ＜ 9% in flue gas, venting of dust explosion seldom can occur.In l1 bar
I.e. using highcasting speed method catch carbon with when re-blowing under part, co ＞ 9% in flue gas, flue constantly sucks in air flue gas oxygen content gradually
Increase, as o2 ＞ 6%, electrostatic precipitator will occur venting of dust explosion.Therefore, in converter catch carbon with during re-blowing, control venting of dust explosion master
If the venting of dust explosion occurring during for terminal point control using highcasting speed method.By investigation, prevent currently without in converter highcasting speed
Electrostatic precipitator venting of dust explosion mature technology.
Understand that the mechanism of electrostatic precipitator venting of dust explosion phenomenon is: the o in co and flue that converter decarburization produces by above analysis2
In the mixed proportion in electrostatic precipitator in the range of explosion limit, there is venting of dust explosion when electrode discharge.Therefore prevent venting of dust explosion
Measure the most basic is exactly to control co and o in flue gas2Content, makes co and o through electric cleaner flue gas2Content is not in explosion limit
In the range of, at this moment would not cause venting of dust explosion during electrode discharge.
Content of the invention
The technical problem to be solved is that offer is a kind of prevents highcasting speed method converter dry dust pelletizing system venting of dust explosion
Method, under the conditions of this method can make dry dedusting technology, converter control adopts highcasting speed method, it is to avoid produce in highcasting speed method
When low-alloy and high-carbon steel there is venting of dust explosion in dry-dedusting system, can protect electrostatic precipitator equipment, improves converter smelting operation
Rate, improves steel quality, reduces production cost.
The technical scheme solving above-mentioned technical problem is:
A kind of method preventing highcasting speed method converter dry dust pelletizing system venting of dust explosion, it is using following processing step:
1. related request during highcasting speed:
Shift to an earlier date 20s and reduce oxygen supply intensity before catch carbon, oxygen flux control is in the 45-55% of specified oxygen flow, hypoxia amount
The blowing regular hour, slow down reaction between carbon and oxygen speed, open vapotron 3 outlet nitrogen valve simultaneously, continue the 30s amount of being blown into
About 7800nm3The nitrogen of/h；
2. re-blow related request:
If 1. during first time catch carbon carbon content ＜ 0.15%, can directly open total oxygen blowing；
If 2. first time catch carbon carbon content is in 0.15-0.20%, lower rifle is re-blow nitrogen simultaneously, can directly open total oxygen simultaneously
Blowing.
If 3. during first time catch carbon carbon content 0.20%-0.40%, can perform climbing oxygen blast；
If 4. during first time catch carbon carbon content ＞ 0.40%, lower rifle is re-blow nitrogen simultaneously, simultaneously main blowing oxygen quantity manually set for
The 65% of specified oxygen flow.
The above-mentioned method preventing highcasting speed method converter dry dust pelletizing system venting of dust explosion, re-blows in related request, described execution
Climbing oxygen blast, needs to adjust manually oxygen flow to the 50% of specified oxygen flow before secondary lower rifle, lower rifle is re-blow nitrogen simultaneously, oxygen blast 30s
After can progressively carry oxygen manually, in 20s, oxygen flow half oxygen progressively rises to total oxygen, oxygen flow rise to during total oxygen close nitrogen, Ran Houke
Total oxygen heats up.
The invention has the beneficial effects as follows:
The present invention is blown into nitrogen amount by controlling oxygen flow and control in highcasting speed, and root when secondary lower rifle is re-blow
According to catch carbon carbon content control blowing oxygen quantity pattern, can effectively prevent highcasting speed method converter dry dust pelletizing system venting of dust explosion, realize safety
Produce, be conducive to improving converter smelting operating rate simultaneously, reduce production cost, improve steel quality.In dry dedusting technology bar
Under part, realize the mesh of converter highcasting speed method steady production low-alloy (hrb400 series) and high-carbon steel (40-80#, 77b, 82b etc.)
Mark.
Brief description
Fig. 1 is converter dry dust collecting process flow chart；
Fig. 2 is co-o2-co2(+n2) system explosive range；
Fig. 3 is co-o2-co2(+n2+ n2Mend) explosive range of system；
Fig. 4 is converter gas composition schematic diagram；
Fig. 5 is the catch carbon of first embodiment of the present invention, curve chart of re-blowing；
Fig. 6 is the catch carbon of second embodiment of the present invention, curve chart of re-blowing.
In figure labelling is as follows: movable gas hood 1, gasification cooling flue 2, vapotron (ec) 3, electrostatic precipitator (ep) 4,
Blower fan 5, diffusing chimney 6, gas cooler (gc) 7, gas chamber 8.
Specific embodiment
The present invention is a kind of method preventing highcasting speed method converter dry dust pelletizing system venting of dust explosion, and this method can make height draw
Dry dedusting technology is adopted, it is to avoid the dry-dedusting system when highcasting speed method produces low-alloy and high-carbon steel in carbon method converter producing
There is venting of dust explosion, electrostatic precipitator equipment can be protected, improve converter smelting operating rate, reduce production cost, improve steel quality.
Technical scheme is using following processing step:
1. related request during highcasting speed:
Shift to an earlier date 20s and reduce oxygen supply intensity before catch carbon, oxygen flux control is in the 45-55% of specified oxygen flow, hypoxia amount
The blowing regular hour, slow down reaction between carbon and oxygen speed, open vapotron 3 outlet nitrogen valve simultaneously, continue the 30s amount of being blown into
About 7800nm3The nitrogen of/h.
2. re-blow related request:
1. as first time catch carbon carbon content ＜ 0.15%, total oxygen blowing can directly be opened；
2. if first time catch carbon carbon content is in 0.15-0.20%, lower rifle is re-blow nitrogen simultaneously, can directly open total oxygen simultaneously
Blowing, can directly adjust flow in 13000-14000 nm3/ h re-blows；
3. as first time catch carbon carbon content 0.20%-0.40% can perform climbing oxygen blast, need to adjust oxygen stream manually before secondary lower rifle
Measure to the 50% of specified oxygen flow, lower rifle is re-blow nitrogen simultaneously, can progressively carry oxygen manually, oxygen flow half oxygen in 20s after oxygen blast 30s
Progressively rise to total oxygen, oxygen flow rises to closing nitrogen during total oxygen, then can total oxygen heat up.
When 4. as first time catch carbon carbon content ＞ 0.40%, lower rifle is re-blow nitrogen simultaneously, simultaneously main blowing oxygen quantity manually set for
The 65% of specified oxygen flow.
Below in conjunction with the accompanying drawings embodiments of the invention and implementation result are described further.
Embodiment 1
In the present embodiment, heat (batch) number 4a10149, grade of steel: hrb400b, steel grade: low-alloy, c:0.20-0.25%.Produce this low
When alloy adopts highcasting speed method to produce, before catch carbon, oxygen flow is adjusted to the 50% of specified oxygen flow by 20s manually, beats simultaneously
Open vapotron nitrogen valve below, nitrogen flow 7800nm3/h, nitrogen charging time 30s.When re-blowing, oxygen flow is by specified
Oxygen flow, does not operate according to the inventive method.Draw out co-o2-co2 (+n2) Fig. 5 ternary according to this heat (batch) number smoke components
Figure, when re-blowing as shown in Figure 5, smoke components do not bypass explosion-risk area.Scene actual show this heat (batch) number smelt when, when re-blowing
There is small-sized venting of dust explosion.
Embodiment 2
In the present embodiment, heat (batch) number 4b12161, grade of steel: 55#, steel grade: high-carbon steel, c:0.53-0.57%.Using highcasting speed method
Control terminal, before catch carbon, oxygen flow is adjusted to the 50% of specified oxygen flow, after opening vapotron by 20s manually simultaneously
The nitrogen valve in face, nitrogen flow 7800nm3/ h, rushes nitrogen time 30s.When re-blowing, oxygen flow is adjusted to oxygen flow manually
For specified oxygen flow 65%.Draw out co-o according to this heat (batch) number smoke components2-co2(+n2) Fig. 6 ternary diagram, dotted line abc is height
Flue gas co-o during catch carbon2-co2(+n2) composition profiles, find out that composition substantially avoids blast area by figure.Cd is co-o when re-blowing2-
co2(+n2) composition profiles, composition is also away from explosive range.There is not venting of dust explosion in actual smelting the in scene.
By above example as can be seen that low-alloy and high-carbon steel are produced using highcasting speed method of the present invention, dry method can be prevented
Dust pelletizing system venting of dust explosion, realizes safety in production, is conducive to improving converter smelting operating rate simultaneously, reduces production cost, improves molten steel
Quality.Under the conditions of dry dedusting technology, realize converter highcasting speed method steady production low-alloy (hrb400 series) and high-carbon steel
The target of (40-80#, 77b, 82b etc.).
Claims (2)
1. a kind of method preventing highcasting speed method converter dry dust pelletizing system venting of dust explosion it is characterised in that: it adopts following technique step
Rapid:
A. related request during highcasting speed:
Shift to an earlier date 20s and reduce oxygen supply intensity before catch carbon, oxygen flux control blows in the 45-55% of specified oxygen flow, hypoxia amount
Regular hour, slow down reaction between carbon and oxygen speed, open vapotron (3) outlet nitrogen valve simultaneously, continue the 30s amount of being blown into about
7800nm3The nitrogen of/h；
B. re-blow related request:
If 1. during first time catch carbon carbon content ＜ 0.15%, directly open total oxygen blowing；
If 2. first time catch carbon carbon content is in 0.15-0.20%, lower rifle is re-blow nitrogen simultaneously, directly opens total oxygen blowing simultaneously；
If 3. during first time catch carbon carbon content 0.20%-0.40%, execution climbing oxygen blast；
If 4. during first time catch carbon carbon content ＞ 0.40%, lower rifle is re-blow nitrogen simultaneously, and main blowing oxygen quantity manually sets as specified simultaneously
The 65% of oxygen flow.
2. the method preventing highcasting speed method converter dry dust pelletizing system venting of dust explosion according to claim 1 it is characterised in that:
Secondary lower rifle is re-blow in related request, described execution climbing oxygen blast, needs before secondary lower rifle to adjust oxygen flow manually to specified oxygen
The 50% of flow, lower rifle is re-blow nitrogen simultaneously, progressively carries oxygen manually, in 20s, oxygen flow half oxygen progressively rises to total oxygen after oxygen blast 30s,
Oxygen flow rises to closing nitrogen during total oxygen, and then total oxygen heats up.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107794333A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | It is a kind of prevent from bessemerizing interrupt after venting of dust explosion method |
| CN109868337A (en) * | 2019-04-22 | 2019-06-11 | 中冶华天工程技术有限公司 | A method of preventing once dust collection of converter Wet-electric duster ontology venting of dust explosion |
| CN111593163A (en) * | 2020-04-15 | 2020-08-28 | 浙江大维高新技术股份有限公司 | Converter gas flue gas conditioning system and flue gas conditioning method thereof |
| CN115404301B (en) * | 2022-09-09 | 2024-02-27 | 山东莱钢永锋钢铁有限公司 | Method for preventing explosion venting of converter dry dedusting system |
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| JPH01259116A (en) * | 1988-04-08 | 1989-10-16 | Kobe Steel Ltd | Converter gas treating device |
| CN101619375A (en) * | 2009-08-07 | 2010-01-06 | 山西太钢不锈钢股份有限公司 | Method for preventing electric precipitation detonation discharge of top and bottom blown converter |
| CN102010928A (en) * | 2010-12-15 | 2011-04-13 | 武汉钢铁(集团)公司 | Converter oxygen lance blowing control method based on dry dedusting process |
| CN102912073A (en) * | 2012-11-08 | 2013-02-06 | 攀钢集团研究院有限公司 | Method for preventing vanadium extraction converter dry dedusting system from vented explosion |
| CN104313236A (en) * | 2014-11-17 | 2015-01-28 | 武钢集团昆明钢铁股份有限公司 | Explosion venting control method for converter dry-method dust removal system in high-altitude area |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01259116A (en) * | 1988-04-08 | 1989-10-16 | Kobe Steel Ltd | Converter gas treating device |
| CN101619375A (en) * | 2009-08-07 | 2010-01-06 | 山西太钢不锈钢股份有限公司 | Method for preventing electric precipitation detonation discharge of top and bottom blown converter |
| CN102010928A (en) * | 2010-12-15 | 2011-04-13 | 武汉钢铁(集团)公司 | Converter oxygen lance blowing control method based on dry dedusting process |
| CN102912073A (en) * | 2012-11-08 | 2013-02-06 | 攀钢集团研究院有限公司 | Method for preventing vanadium extraction converter dry dedusting system from vented explosion |
| CN104313236A (en) * | 2014-11-17 | 2015-01-28 | 武钢集团昆明钢铁股份有限公司 | Explosion venting control method for converter dry-method dust removal system in high-altitude area |
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