CN105238903A - Method for achieving splashing slag furnace protecting work by means of converter gas - Google Patents
Method for achieving splashing slag furnace protecting work by means of converter gas Download PDFInfo
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- CN105238903A CN105238903A CN201510561089.3A CN201510561089A CN105238903A CN 105238903 A CN105238903 A CN 105238903A CN 201510561089 A CN201510561089 A CN 201510561089A CN 105238903 A CN105238903 A CN 105238903A
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- slag
- converter
- gas
- splashing
- coal gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a method for achieving splashing slag furnace protecting work by means of converter gas. According to the technique, the converter gas is used for conducting the splashing slag furnace protecting work instead of nitrogen, in this way, rapid and efficient gasification and dephosphorization can be achieved while the splashing slag furnace protecting work is achieved, the initial dephosphorization capacity of the next furnace can be greatly improved, conditions are provided for a few-slag steel-making technique, and steel-making cost is reduced; meanwhile, cyclic utilization of coal gas is achieved; the time for the splashing slag furnace protecting work can be shortened, and the slag corrosion resistance of a slag splashing layer is improved; the nitrogen obtained through replacement can be used for producing the products such as liquefied nitrogen, and the additional value is increased.
Description
Technical field
The present invention relates to field of steel-making, be specifically related to a kind of protecting method with splash slag of steel melting furnace.
Background technology
Splashing slag in converter technique nineteen ninety-five imports China into and has recent two decades so far.This technique stays in stove by slag after converter tapping, penetrates elevated pressure nitrogen air-flow slag splash to furnace wall will be played the effect of protection furnace lining by oxygen lance spraying.Two decades years carrys out this Technology and obtains development, in succession occurs many patented technologies relevant to slag splashing.As patent " converter is spattered gasification in slag process and removed the method for phosphorus in the slag " (patent No.: 200610012514.4), be add carbonaceous reducing agent or siliceous reducer in slag splashing forward direction stove, in slag splashing operation process, gasification removes part phosphorus in slag.But find in actual tests, spatter the carbonaceous reducing agent added in slag forward direction stove and first consume part carbonaceous reducing agent with the FeO generating portion reduction reaction in slag, carbonaceous reducing agent has added few (about 150 kilograms), gasification dephosphorization rate is low, only has 10.33%, has added (being greater than 650 kilograms), gasification dephosphorization rate is also low, only have when add-on 650 kilograms (about suitable 4 kgs/tonne of steel), gasification dephosphorization rate is the highest, but also only has 31.36%.Reason is that reduction dosage adds and lacked not, having added not only to cause cooling of furnace slag to be lowered the temperature, and roll up solid particulate in slag and cause slag to become sticky, the carbonaceous reducing agent added was about 1.26-3.61% by FeO in grate reducing slag before spattering slag, and be not almost reduced reduction again at the FeO in slag 2-4 minute period slag that continues to spatter subsequently, FeO reduces can make slag melting point slightly raise, and this three causes slag viscosity to increase, thus the dynamic conditions of havoc gasification dephosphorisation reaction.In addition, a large amount of carbonaceous reducing agent added mixes with slag and uneven increases slag local viscosity or caking is unfavorable for slag splashing operation.Therefore this technique because of add a large amount of carbonaceous reducing agent not only cost high and gasification dephosphorization effect poor, gasification dephosphorization rate the highest once in a while also only has about 30%, far do not reach the dephosphorization effect of nearly 60% of the best in patent, this patented technology because cost performance is low without actual application value, see " experimental studies of Tang Gang 150 tons of splashing slag in converter process systemization researchs " author Zhang Xiang, on April 15th, 2007; Above-mentioned patented technology is the same with technique popular at present, and all use nitrogen to make winding-up source of the gas, this gas is that rare gas element does not have reductive agent effect and not recyclable, and cost is higher.Patent " CO
2for method (200610165219.2) the isolated high-purity CO of industrial gaseous waste of converter steelmaking slag splashing
2gas as sparging gas, and adds carbonaceous reducing agent in the forward direction stove spattering slag, spatters in slag process and produces CO
2+ C=CO ↑ reclaimed, but or because weak effect or cost height are without practical application.
Summary of the invention
Carbonaceous reducing agent gasification dephosphorization effect is poor, the high present situation that cannot realize practical application of cost to use nitrogen to add for the operation of converter current slag splashing, object of the present invention is intended to develop a kind of coal gas of converter replacement nitrogen utilizing steel mill self to occur and spatters slag source of the gas, promotes slag gasification dephosphorization effect and realizes the utilization of remaining coal-gas recovering simultaneously.
RECOVERY OF CONVERTER GAS utilizes technique to be a maturation process very, this technique falls movable gas hood when bessemerizing, aditus laryngis aperture is regulated to control the air capacity of fire door suction by fire door minute-pressure system directive hydraulic control Venturi meter, both the quantity combusted of CO had been reduced, also effectively the furnace gas controlled containing CO leaks, what produced carries out dedusting, by CO, O after driven fan containing CO flue gas through cooling arrival dust-removal system
2cO, O in furnace gas analyzed by analyser
2content, CO, O
2gas up to standard enters gas chamber by the adjustment of T-valve, and below standard gas also to be made a gift to someone diffusing tower post combustion emission by T-valve.The gas temperature reclaimed when bessemerizing can up to 1500 DEG C, and in carbon period coal gas of converter, CO can up to 80% or more.General containing CO60-80%, CO in the coal gas that converter is reclaimed
215-20%, and the oxygen of nitrogen, hydrogen and trace, its proportion>=nitrogen.The ripe perfect coal gas of high temperature recovery system of the existing safety of converter is that the exploitation of the technology of the present invention provides precondition.The principle of the technology of the present invention is such, and result of study shows, P when adding carbon gasification dephosphorization under splashing slag in converter operating condition in slag
2o
5prior to FeO reduction and the reduction reaction of gasification dephosphorization to meet two steps theoretical, that is, the first step, the solid carbon added first with CO in furnace gas
2reaction generates indirect reduction agent CO:CO
2+ C=CO ↑ (1); Second step, P
2o
5the CO be generated reduces and gasifies: P
2o
5+ 5CO ↑=P
2(g) ↑+5CO
2↑ (2); Fig. 1 is gasification dephosphorization two step reaction schematic diagram.Wherein, CO is reacted
2+ C=CO ↑ (1) and P
2o
5in slag, be diffused as the restricted link of gasification dephosphorization, refer to the thermodynamics and kinetics fundamental research of Dephosphorization " under the flowing nitrogen condition " Institutes Of Technology Of Hebei, author Xiang Li, in May, 2005.When converter starts rifle under slag splashing operation, petticoat pipe and gas recovery system are in coal-gas recovering state, penetrated by oxygen lance spraying through the qualified coal gas of converter up to standard of Recovery Purifying high pressure gas after pressurization, slag in stove is splash, whole spatter slag during continue an about 2-4 minute internal furnace and shroud and be full of in CO reducing atmosphere, the P in high-temperature liquid state slag
2o
5contact with CO mono-under high temperature (>=1500 DEG C) with high speed coal gas jet impulse and namely occur: P
2o
5+ 5CO ↑=P
2(g) ↑+5CO
2↑ reaction.With nitrogen N
2make source of the gas and the slag technique of spattering of adding carbonaceous reducing agent in slag is compared, use coal gas of converter to spatter the slag source of the gas dephosphorization that gasifies and there is not CO
2↑+C=2CO ↑ need generates this reaction process of CO, and high pressure gas jet directly not yet will smash atomization through the high-temperature liquid state slag of sparging gas cooling, and while smashing atomization in coal gas CO drip middle P with the liquid slag splash in a large number
2o
5big area fully contacts, and now slag does not yet simultaneously have a large amount of carbonaceous reducing agent to add through high pressure gas cooling to cause slag viscosity to increase severely yet, and whole burner hearth fills thorough tiny liquid slag and drips, CO and P
2o
5contact area is large, P
2o
5in slag, mass transfer velocity is fast.Therefore spatter slag source of the gas with coal gas, eliminate and add with nitrogen the restricted link that carbon spatters two gasification dephosphorizations of slag process gasification dephosphorization, namely there is not CO
2↑+C=2CO ↑ reaction process and P
2o
5the limiting element that in slag, velocity of diffusion is slow, gasification dephosphorization speed will sharply increase, and can will reach the dephosphorization effect that better gasifies in shorter spattering in the slag time; More than qualified by converter gas recovery system after the coal gas that oxygen lance spraying penetrates spatters slag, coal gas can reclaim again, cyclic; If make the coal gas CO content of recovery reduce less or not reduce, can consider to add carbonaceous reducing agent in right amount spattering in slag forward direction stove, spatter the CO occurred in slag process
2↑+C=2CO ↑ reaction, can make CO in furnace gas reduce less or not reduce; For improving coal gas of converter CO content further, promoting gasification dephosphorization effect and can consider that converter carbon period coal gas being reclaimed separately storage uses.
Technical scheme of the present invention is such, and tapping is finished, and stays all or part of for a upper stove terminal slag in stove.Converter back to zero position, before under converter, rifle is about to start slag splashing operation, converter gas recovery system is made to be in coal-gas recovering state, petticoat pipe is in tiny structure difference state, use the qualified coal gas of converter up to standard of safety purification after testing, oxygen level in strict control coal gas, CO content is generally at 60-80%, and CO content is more high better.Existing nitrogen pressurization gas storage gas transmission system can be utilized.Coal gas total pressure through pressurization is 1.2-1.7MPa, and spattering slag operating pressure is 0.6-1.4MPa, and flow is 5000-80000m
3/ h, concrete gas pressure and the flow of using is determined according to the condition of each steel mill and converter tonnage.High pressure gas spatters the oxygen lance spraying injection high pressure gas jet that slag robs position splash by slag through exploring downward to, and implements slag splashing operation; The processing method that the method for slag splashing operation of the present invention uses is the same with nitrogen retaining operation method of preventing splash slag, and uniquely different features is to instead of nitrogen with coal gas of converter.This processing method is equally applicable to the operation of electric arc furnace slag splashing, namely replaces nitrogen with electric arc producer gas and carries out slag splashing operation.The gas that coal gas of converter can be also main component by other CO is replaced.
The beneficial effect that the present invention obtains is, the coal gas utilizing converter self to occur makes the source of the gas of slag splashing operation, rapidly and efficiently gasify while can realizing slag splashing operation dephosphorization, increases substantially next stove initial stage slag dephosphorizing capacity, for less-slag operation technique provides condition; Realize coal gas recycle simultaneously; The slag splashing activity duration can be shortened, improve and spatter slag blanket slag corrosion resistance ability; The nitrogen cemented out can be produced the products such as liquid nitrogen and improve added value.
Embodiment
Tapping is finished, and stays in stove, converter back to zero position by all or part of for a upper stove terminal slag.Converter gas recovery system is made to be in coal-gas recovering state, petticoat pipe is in tiny structure difference state, the qualified after testing coal gas of converter totally up to standard used, CO content is generally at 60-80%, coal gas CO content is more high better, high pressure gas total pressure is 1.2-1.7MPa, and the operating pressure of spattering slag operation is 0.6-1.4MPa, and flow is 5000-80000m
3/ h, coal gas of converter pressure is relevant with converter capacity with each steel mill condition with the determination of flow, and oxygen rifle drops to and spatters slag rifle position, and slag splashes by the high pressure coal air-flow gone out through oxygen lance spraying, wholely spatters the slag activity duration and continues about 2-4 minute.The flue gas produced after spattering slag arrives dust-removal system through cooling and carries out dedusting, by CO, O after driven fan
2cO, O in furnace gas analyzed by analyser
2content, CO, O
2qualified gas up to standard enters gas chamber by the adjustment of T-valve, and below standard gas also to be made a gift to someone diffusing tower post combustion emission by T-valve.
Embodiment
Certain factory's converter smelting basic condition
BOF nominal capacity: 50 tons
Tap: 64-70 ton
Principal item: carbon knot, pressurized vessel, low alloy steel etc.
Oxygen rifle is joined: three hole Laval shower nozzles
Oxygen flow (mark state): 10500-13000m3/h; Use pressure 0.9-1.0MPa
Average smelting cycle 33min25s
Tapping temperature: 1640-1700 DEG C
Coal gas main component: CO content 55-76%, CO
213-16%, N
215-20%; High pressure gas total pressure is 1.6MPa, and spattering slag operating pressure is 0.8-0.9MPa, and flow is 180-250m
3/ min.Tapping is finished, and stays in stove by all or part of for a upper stove terminal slag, and slag specimen got by the stove that falls.Back to zero position, makes converter gas recovery system be in coal-gas recovering state, and petticoat pipe is in tiny structure difference state.Oxygen rifle explores downward to and spatters slag rifle position and start to spatter slag operation, spatters slag operation and continues 2-4 minute, spatters flue gas that slag produces and arrives dust-removal system through watercooled hood cooling and carry out dedusting, remaining coal gas CO, O after testing
2qualified up to standard, remaining coal gas enters gas chamber by the adjustment of T-valve.Spatter slag to finish, get slag specimen; To spatter before and after slag P in slag
2o
5on average be down to 1.60% by 3.58%, the vaporization rate of phosphorus is minimum is 32%, is up to 78%, and concrete typical a few furnace gas dephosphorization rate embodiment is in table 1.
A few stove of table 1 typically gasifies dephosphorization rate embodiment
Do to further illustrate to technical scheme of the present invention and gasification dephosphorization effect of the present invention by embodiment above; but protection scope of the present invention is not limited only to this, any improvement done based on the principle of the invention all should belong to the protection domain of the claims in the present invention.
Claims (5)
1. by a method for coal gas of converter slag splashing operation, it is characterized in that: replace nitrogen with coal gas of converter and carry out splashing slag in converter operation as spattering slag source of the gas.
2. the method for a kind of coal gas of converter slag splashing as claimed in claim 1 operation, it is characterized in that: the detailed process of carrying out splashing slag in converter operation with coal gas of converter is: tapping is finished, stay in stove by all or part of for a upper stove terminal slag, converter back to zero position, converter gas recovery system is in coal-gas recovering state, oxygen rifle explores downward to and spatters slag operation rifle position, and the coal gas operating pressure of spattering slag is 0.6-1.4MPa, and high pressure gas is 5000-80000Nm through the oxygen lance spraying outflow rate of test
3slag splashes and carries out slag splashing operation by the high pressure gas of/h, and slag splashing operation continues 2-4 minute.
3. the method for a kind of coal gas of converter slag splashing as claimed in claim 2 operation, is characterized in that: coal gas of converter can be replaced by the gas being main component containing CO.
4. the method for a kind of coal gas of converter slag splashing as claimed in claim 3 operation, is characterized in that: coal gas of converter can be replaced by electric arc furnace coal gas.
5. the method for a kind of coal gas of converter slag splashing as claimed in claim 4 operation, is characterized in that: this retaining operation method of preventing splash slag is equally applicable to the operation of electric arc furnace slag splashing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510561089.3A CN105238903A (en) | 2015-08-28 | 2015-08-28 | Method for achieving splashing slag furnace protecting work by means of converter gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510561089.3A CN105238903A (en) | 2015-08-28 | 2015-08-28 | Method for achieving splashing slag furnace protecting work by means of converter gas |
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| CN105238903A true CN105238903A (en) | 2016-01-13 |
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|---|---|---|---|
| CN201510561089.3A Pending CN105238903A (en) | 2015-08-28 | 2015-08-28 | Method for achieving splashing slag furnace protecting work by means of converter gas |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108344307A (en) * | 2018-03-20 | 2018-07-31 | 马鞍山钢铁股份有限公司 | A kind of revolving furnace fume hood accumulated slag method for cleaning and revolving furnace fume hood accumulated slag clear up rifle |
| CN109321704A (en) * | 2018-10-30 | 2019-02-12 | 华北理工大学 | It is a kind of to reduce the smelting process for smelting finishing slag phosphorus content using slag splashing |
| CN109593906A (en) * | 2018-12-31 | 2019-04-09 | 王虎 | One kind bessemerizing terminal pretreatment of slag new process |
| CN110184399A (en) * | 2019-06-12 | 2019-08-30 | 钢研晟华科技股份有限公司 | It is a kind of using oxidation sweetening, the process for treating steel slag of dephosphorization under reducing atmosphere two-step method |
| CN110484686A (en) * | 2019-08-19 | 2019-11-22 | 华北理工大学 | A kind of converter Dephosphorization method and smelting process |
| CN113061687A (en) * | 2019-12-30 | 2021-07-02 | 王虎 | Online pretreatment process for electric arc furnace slag |
| CN113122673A (en) * | 2019-12-30 | 2021-07-16 | 王虎 | CaC using calcium carbide2Process for pretreating converter blowing end point steel slag |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0931513A (en) * | 1995-07-12 | 1997-02-04 | Nippon Steel Corp | Steelmaking method in combination blown converter having long service life of refractory |
-
2015
- 2015-08-28 CN CN201510561089.3A patent/CN105238903A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0931513A (en) * | 1995-07-12 | 1997-02-04 | Nippon Steel Corp | Steelmaking method in combination blown converter having long service life of refractory |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108344307A (en) * | 2018-03-20 | 2018-07-31 | 马鞍山钢铁股份有限公司 | A kind of revolving furnace fume hood accumulated slag method for cleaning and revolving furnace fume hood accumulated slag clear up rifle |
| CN109321704A (en) * | 2018-10-30 | 2019-02-12 | 华北理工大学 | It is a kind of to reduce the smelting process for smelting finishing slag phosphorus content using slag splashing |
| CN109321704B (en) * | 2018-10-30 | 2021-02-26 | 华北理工大学 | Smelting method for reducing phosphorus content of smelting final slag by slag splashing furnace protection |
| CN109593906A (en) * | 2018-12-31 | 2019-04-09 | 王虎 | One kind bessemerizing terminal pretreatment of slag new process |
| CN110184399A (en) * | 2019-06-12 | 2019-08-30 | 钢研晟华科技股份有限公司 | It is a kind of using oxidation sweetening, the process for treating steel slag of dephosphorization under reducing atmosphere two-step method |
| CN110484686A (en) * | 2019-08-19 | 2019-11-22 | 华北理工大学 | A kind of converter Dephosphorization method and smelting process |
| CN113061687A (en) * | 2019-12-30 | 2021-07-02 | 王虎 | Online pretreatment process for electric arc furnace slag |
| CN113122673A (en) * | 2019-12-30 | 2021-07-16 | 王虎 | CaC using calcium carbide2Process for pretreating converter blowing end point steel slag |
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Application publication date: 20160113 |
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