CN102676741A - KR (knotted reactor) powder spraying, stirring and desulfurizing device and method - Google Patents
KR (knotted reactor) powder spraying, stirring and desulfurizing device and method Download PDFInfo
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- CN102676741A CN102676741A CN2012101729838A CN201210172983A CN102676741A CN 102676741 A CN102676741 A CN 102676741A CN 2012101729838 A CN2012101729838 A CN 2012101729838A CN 201210172983 A CN201210172983 A CN 201210172983A CN 102676741 A CN102676741 A CN 102676741A
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Abstract
The invention relates to a KR (knotted reactor) powder spraying, stirring and desulfurizing device. The KR powder spraying, stirring and desulfurizing device comprises a stirring head and a driving device for controlling the stirring head to act, wherein the driving device comprises a connecting rod linked with the stirring head, a lifting device for driving the connecting rod to move up and down and a stirring motor for driving the connecting rod to rotate. The KR powder spraying, stirring and desulfurizing device is characterized by further comprising a feeding system and a high-pressure gas source, wherein a through hole for introducing high-pressure inert gas and desulfurizing agents is formed on the stirring head, and an inlet of the through hole is communicated with a desulfurizing agent outlet and a high-pressure gas source outlet of the feeding system. The invention further relates to a method for desulfurizing molten iron by using the KR powder spraying, stirring and desulfurizing device. By using the device, efficient, fast and precise desulfurization can be realized, and the effects of reducing the requirements for granularity of desulfurizing agents, reducing the temperature drop and reducing the loss of the stirring head can be achieved.
Description
Technical field
The present invention relates to a kind of KR stirring desulphurization device and method that dusts.
Background technology
Along with the high speed development of economy and iron and steel technology, society requires increasingly highly, more and more harsher to steel quality, and the kind of product also sharply increases, and the demand of especially high-quality high added value steel grade constantly increases.Face the competition that the steel market is growing more intense; The molten iron pretreatment desulfurizing of economical and efficient; Typical case as the modern steel explained hereafter optimizes one of important step of technical process " blast furnace ironmaking-hot metal pretreatment-converter steelmaking-external refining-sequence casting-heat is sent rolling ", has been widely used in actual production.
The desulfurizing iron technology develops rapidly over nearly 30 years, and tens kinds of treatment processs have been arranged at present, and wherein using the most representative mainly is blowing process and KR mechanical mixing method.They are all quite ripe technically.
The KR mechanical mixing method; Be with pouring fireproof material and through the cruciform stirring-head of overbaking, immerse the certain degree of depth in hot metal ladle molten bath, borrow its whirlpool that rotation produces; Make the quicklime or carbide of calcium base desulfurization powder and the abundant contact reacts of molten iron that add the molten iron top of the slag, reach the desulfurization purpose.Its advantage is that dynamic conditions is superior, helps adopting cheap sweetening agent such as quicklime.
Blowing process is to utilize rare gas element (N
2Or Ar) do carrier with desulfurization powder (like CaO, CaC
2And Mg) sprayed in the molten iron by spray gun, the effect of stirring molten iron is played in carrier gas simultaneously, makes that thorough mixing carries out desulfurization between blowing gas, sweetening agent and the molten iron three.At present, winding-up magnesium fimily desulfurizing agent is main development trend, and its advantage is that cost of equipment is low, flexible operation, and the winding-up time is short, and hot metal temperature drop is little.
These two kinds of application are sulfur removal technology the most widely, the effect from actual production, and the two has length mutually.KR sulfur removal technology biggest advantage is that dynamic conditions is superior, and can adopt cheap sweetening agent, but because sweetening agent all joins the hot metal ladle top of the slag through high hopper, the granularity of sweetening agent is very big to the sweetening effectiveness influence.Though the desulfurization of KR method is at present by extensive employing, complex equipments, one-time investment is big, shortcoming such as have that sorbent consumption is big, the quantity of slag big, desulfurization long processing period, hot metal temperature drop are bigger.Compare the KR method, a less investment of blowing process is fit to the low-cost technologies transformation of medium and small sized enterprises.The maximum shortcoming of blowing process is that dynamic conditions is poor, and the sweetening agent cost is high, generally adopts CaC
2Or the Mg base desulfurizer, there are some researches show that under the situation of all using the CaO base desulfurizer, the desulfurization degree of KR method is four times of blowing process.
It is investigated the patent No. 200610124845.7 " KR method digester bottom blowing method "; Announced a kind of KR method digester bottom blowing method; Its step comprises: slag is opened and is blown before taking off, and is adjusted to minimum ventilative situation behind the logical high pressure nitrogen, makes molten iron liquid level magic flower be 1/10th of jar internal volume; Begin bottom blowing nitrogen during stirring, the bottom blowing flow is 12 ~ 23Nm3/h, and bottom blowing pressure is 0.3 ~ 0.8MPa; After stirring finishes, the sampling thermometric, molten iron temperature is an observed temperature; Took off back slag bottom blowing nitrogen 3 ~ 8 minutes, the bottom blowing nitrogen pressure is 0.5 ~ 0.8MPa.This method can shorten the desulfurization cycle to a certain extent, reduces desulphurization cost, improve desulfuration efficiency; But, sweetening agent adds on the molten iron liquid level because being still from high hopper; The whirlpool that leans on the cross stirring rake to produce is brought sweetening agent in the molten iron into; Sorbent utilization is not high, increases jar increase desulfurization dynamic conditions that end bottom blowing nitrogen also only can be limited, and desulfuration efficiency improves limited.
It is investigated and the patent No. 200710051992.0 " molten iron spraying desulfurization spraying gun " relate to a kind of pretreated spray gun of iron ladle molten iron spraying desulfurization spraying that is used for.Be responsible for torsional deformation to the existing in prior technology spray gun core, can not extract replacing out when causing jetting the pipe plug plug, and then the rifle core that the brings problem that can not reuse.This utility model only changes the rifle core, does not change the inherent shortcoming of blowing process.
Summary of the invention
Technical problem to be solved by this invention is: a kind of KR is provided the stirring desulphurization device and method that dusts; Efficient to realize, fast, precisely desulfurization, reach and reduce the processing cycle, reduce the requirement of sorbent particle degree, reduce temperature drop and reduce the effect of stirring-head loss.
The present invention provides a kind of KR the stirring desulphurization device that dusts; The drive unit that comprises stirring-head and the action of control stirring-head; Described drive unit comprises a connecting rod that connects stirring-head, lifting device that drive link moves up and down and the stirring motor of drive link rotation; Also have charging system and high-pressure air source, have the through hole of logical high-pressure inert gas and sweetening agent on the described stirring-head, described through hole import is communicated with the sweetening agent outlet and the high-pressure air source outlet of charging system.
As preferably; Described connecting rod is a hollow tube; The lower end of hollow tube detachably connects with stirring-head and the mouth of pipe of hollow tube and the through hole sealed butt joint of stirring-head; The top of hollow tube is provided with sweetening agent import and high pressure gas import, and the sweetening agent outlet of described sweetening agent import and charging system is through pipeline connection, and pipeline connection is passed through in the high pressure gas import of hollow tube and high-pressure air source outlet.
As preferably, described stirring-head is the cruciform stirring-head, and described through hole is opened in the hub position of stirring-head.
As preferably, described charging system comprises the storage hopper of depositing sweetening agent and the metering hopper that feeds intake, and described storage hopper is positioned at the metering hopper top that feeds intake.
Utilize KR of the present invention to dust the stirring desulphurization device, may further comprise the steps the method for desulfurizing iron:
1. open lifting device, when stirring-head moves to apart from molten iron liquid level top 2 ~ 10cm, open high-pressure air source and spray into rare gas element, make the agent of carrier gas blowing desulfurization, carrier gas flux 10 ~ 50Nm
3/ h, nebulizer gas pressure are 0.3 ~ 1.2MPa;
2. after carrier gas is opened, open charging system, bring the sweetening agent in the feed bin into transfer line, through the stirring-head end ejection of hollow, the sweetening agent operational throughput is 0.05 ~ 0.5t/min to sweetening agent under the rare gas element effect that high-pressure air source feeds;
3. open stirring motor and drive the stirring-head stirring and continue to drop to the working position, the stirring-head rotating speed progressively increases, when reaching 80 ~ 120 commentaries on classics; Invariablenes turning speed; This moment, desulphurization reaction speed reached maximum, and molten iron carries out dark desulfurization, lasted to accomplish desulfurization behind 2 ~ 6min and handle.
Said carrier gas is N
2Or Ar, sweetening agent is CaO, CaC
2Or Mg.
Carrier gas flux, pressure are big more, and sweetening agent mixes even more with molten iron, and sweetening effectiveness is better; The sweetening agent operational throughput is big more, and sweetening effectiveness is also better.Parameter among above-mentioned steps ⑴, ⑵ and the ⑶ is set according to practical situation such as pending molten iron, target sulphur content and sweeteners.
The shortcoming that existing two kinds of Technologies of describing to background technology exist, and combine the advantage of existing two kinds of Technologies has been invented a kind of KR stirring desulphurization technology of dusting, and promptly adopts the whipping appts and the stirring-head of hollow, stirring simultaneously, utilizes rare gas element (N
2Or Ar) do carrier with desulfurization powder (like CaO, CaC
2And Mg) from the whipping appts of hollow and stirring-head, sprays in the molten iron, improve the contact reacts chance of sweetening agent and molten iron; The effect of stirring molten iron is also played in carrier gas simultaneously.
The present invention compared with prior art has following major advantage:
One of which, the desulfurization cycle obviously shortens, the processing cycle be merely present KR desulfurization 1/3 ~ 1/2 (the desulfurization working hour is reduced to 2 ~ 6min);
Its two, hot metal temperature drop obviously reduces, hot metal temperature drop is merely 1/3 ~ 1/2 (temperature drop is reduced to 15 ~ 40 ℃) of present KR desulfurization;
Its three, doctor solution consumption obviously reduces, doctor solution consumption is merely 1/3 ~ 2/3 (desulfurization (0.001%) consume be reduced to 0.07 ~ 0.20kg/tFe [S]) of present KR desulfurization;
Its four, sweetening effectiveness is very stable, desulfurized molten iron [S] can reach 0.001% until vestige;
Its five, former processing requirement sweetening agent granularity is accounting for more than 80% between 0.4 ~ 1.0mm, the employing of this technology can reduce the requirement to the sweetening agent granularity, tiny powder (＜Φ 0.4mm) also can adopt present technique to use;
Its six because the present invention difference and traditional KR stirring desulphurization, sweetening agent is not be used in the molten iron top of the slag and is added sweetening agent by the outlet ejection of stirring-head lower end, can cancel the operation of skimming before the KR desulfurization, reduces processing cycle and the temperature drop of molten iron at the desulfurization station.
Its seven, market outlook are good.
Apparatus of the present invention and method can be widely applied in the molten iron pre-desulfurization technology; A difficult problem such as solve fundamentally that KR sulfur removal technology sorbent consumption is big, the quantity of slag is big, desulfurization long processing period, hot metal temperature drop are bigger; That brings reduces production costs, and the benefit of increase is also very considerable.
In a word; Present method can reduce sorbent consumption, reduction desulphurization cost, the minimizing quantity of slag (minimizing slag-removing time, the iron loss of skimming that reduces; Need the quantity of slag that base iron is be removed totally before the KR desulfurization, skimming after the desulfurization is to remove the slag that desulfurization produces, so the quantity of slag of skimming after desulfurization size is directly related with doctor solution consumption; Doctor solution consumption reduces the back quantity of slag and also reduces thereupon; The iron water amount of taking out of simultaneously of skimming also reduces, and promptly iron loss reduces), improve desulfuration efficiency, realize efficient, fast, precisely desulfurization; Promote substantive raising of KR desulfurization pretreatment technology production technology level, the qualified molten iron of high cleanliness is provided for rapid, variation and low sulfur " steel-making.
Description of drawings
Fig. 1 KR of the present invention stirring desulphurization device synoptic diagram that dusts;
The dust sectional view of stirring-head in the stirring desulphurization device of Fig. 2 KR of the present invention.
Among the figure: 1. stirring-head, 11. through holes, 2. drive unit, 21. connecting rods, 211. sweetening agent imports, 212 high pressure gas imports, 22. lifting devices, 23. stirring motors, 3. charging system, 31. storage hoppers, 32. meterings feed intake hopper, 4. high-pressure air source.
Embodiment
Fig. 1 is shown in Figure 2; The KR of the present invention stirring desulphurization device that dusts; The drive unit 2 that comprises stirring- head 1 and 1 action of control stirring-head; Drive unit 2 comprises a connecting rod 21 that connects stirring-head 1, lifting device 22 that drive link 21 moves up and down and the stirring motor 23 of drive link 21 rotations; It is characterized in that: also have charging system 3 and high-pressure air source 4, have the through hole 11 of logical high-pressure inert gas and sweetening agent on the stirring-head 1, through hole 11 imports are communicated with the sweetening agent outlet and high-pressure air source 4 outlets of charging system 3.
As preferably; Connecting rod 21 is a hollow tube; The lower end of hollow tube detachably connects with stirring-head 1 and the mouth of pipe of hollow tube and through hole 11 sealed butt joint of stirring-head 1; The top of hollow tube is provided with sweetening agent import 211 and high pressure gas import 212, and sweetening agent import 211 is passed through pipeline connection with the sweetening agent outlet of charging system 3, and the high pressure gas import 212 of hollow tube is passed through pipeline connection with the high-pressure air source outlet.
As preferably, stirring-head 1 is the cruciform stirring-head, and through hole 11 is opened in the hub position of stirring-head 1.
As preferably, charging system 3 comprises the storage hopper 31 of depositing sweetening agent and the metering hopper 32 that feeds intake, and storage hopper 31 is positioned at metering hopper 32 tops that feed intake.
Utilize KR of the present invention to dust the stirring desulphurization device, may further comprise the steps the method for desulfurizing iron:
1. open lifting device 22, when stirring-head 1 moves to apart from molten iron liquid level top 2 ~ 10cm, open high-pressure air source 4 and spray into rare gas element, make the agent of carrier gas blowing desulfurization, carrier gas flux 10 ~ 50Nm
3/ h, nebulizer gas pressure are 0.3 ~ 1.2MPa;
2. after carrier gas is opened, open charging system 3, bring the sweetening agent in the feed bin into transfer line, through the stirring-head 1 end ejection of hollow, the sweetening agent operational throughput is 0.05 ~ 0.5t/min to sweetening agent under the rare gas element effect that high-pressure air source 4 feeds;
3. open stirring motor 23 and drive stirring-head 1 stirring and continue to drop to the working position, stirring-head 1 rotating speed progressively increases, when reaching 80 ~ 120 commentaries on classics; Invariablenes turning speed; This moment, desulphurization reaction speed reached maximum, and molten iron carries out dark desulfurization, lasted to accomplish desulfurization behind 2 ~ 6min and handle.
Carrier gas is N
2Or Ar, sweetening agent is CaO, CaC
2Or Mg.
Embodiment 1:
⑴ molten iron situation before handle:
120 tons of iron ladles, 125 tons of interior dress molten iron, hot metal composition: Si 0.43%, P 0.105%, S 0.061% before the desulfurization pre-treatment, 1300 ℃ of molten iron temperatures, the molten iron band quantity of slag 0.8%.
Desulfurization pre-treatment target S≤0.015%.
⑵ desulfurization treating processes:
1. after iron ladle got into the desulfurization station, stirring-head progressively descended; (the cancellation desulfurizing iron is taken off preceding slag operation)
When 2. stirring-head is apart from molten iron liquid level 5cm, open carrier gas (nitrogen), carrier gas flux 30Nm
3/ h, nebulizer gas pressure are 0.8MPa;
3. after carrier gas is opened, bring the desulfurization powder CaO in the feed bin into transfer line, through the stirring-head end ejection of hollow, the desulfurization powder operational throughput is 0.2t/min, desulfurization powder winding-up time 2min, and the pulvis winding-up finishes the continued nitrogen blowing;
4. stirring-head is opened stirring and is continued to drop to working position (the following 1500mm of molten iron liquid level), and the stirring-head rotating speed progressively increases, when reaching 80 commentaries on classics, and invariablenes turning speed.This moment, desulphurization reaction speed reached maximum, and molten iron carries out dark desulfurization, lasts 4min.
5. after stirring finishes, rise stirring-head, stirring-head stops nitrogen blowing after leaving molten iron, the sampling thermometric.
6. take off the back slag, hang hot metal ladle, make steel to the converter hot metal charging.
⑶ handle back molten iron situation:
Molten iron S 0.010%, 1271 ℃ of molten iron temperatures.
Comparative Examples 1 existing KR desulfurization, conventional whipping appts and stirring-head (non-hollow):
⑴ molten iron situation before handle: with embodiment 1.
⑵ desulfurization treating processes:
1. after iron ladle gets into the processing station of skimming, topple over certain angle, slag before having taken off;
2. behind the slag, iron ladle is reformed, and iron ladle is moved to the desulphurisation treater position before having taken off;
3. add 1.2 tons of small-particle sweetening agent CaO (granularity requires 0.4 ~ 1.0mm to account for more than 80%, to improve the desulfuration efficiency of sweetening agent) to the molten iron liquid level.
4. the stirring-head that progressively descends is opened stirring and is dropped to working position (the following 1500mm of molten iron liquid level), and the stirring-head rotating speed progressively increases, when reaching 100 commentaries on classics, and invariablenes turning speed.This moment, desulphurization reaction speed reached maximum, and molten iron carries out desulfurization, lasts 10min.
5. after stirring finishes, rise stirring-head, the sampling thermometric.
6. take off the back slag, hang hot metal ladle, make steel to the converter hot metal charging.
⑶ handle back molten iron situation:
Molten iron S 0.012%, 1235 ℃ of molten iron temperatures.
Embodiment 2:
⑴ molten iron situation before handle:
120 tons of iron ladles, 120 tons of interior dress molten iron, hot metal composition: Si 0.32%, P 0.116%, S 0.057% before the desulfurization pre-treatment, 1310 ℃ of molten iron temperatures, the molten iron band quantity of slag 1.0%.
Desulfurization pre-treatment target S≤0.001%.
⑵ desulfurization treating processes:
1. after iron ladle got into the desulfurization station, stirring-head progressively descended; (the cancellation desulfurizing iron is taken off preceding slag operation)
When 2. stirring-head is apart from molten iron liquid level 3cm, open carrier gas (nitrogen), carrier gas flux 35Nm
3/ h, nebulizer gas pressure are 1.0MPa;
3. after carrier gas is opened, with the desulfurization powder CaC in the feed bin
2Bring transfer line into, through the stirring-head end ejection of hollow, the desulfurization powder operational throughput is 0.25t/min, desulfurization powder winding-up time 4min, and the pulvis winding-up finishes the continued nitrogen blowing;
4. stirring-head is opened stirring and is continued to drop to working position (the following 1500mm of molten iron liquid level), and the stirring-head rotating speed progressively increases, when reaching 100 commentaries on classics, and invariablenes turning speed.This moment, desulphurization reaction speed reached maximum, and molten iron carries out dark desulfurization, lasts 6min.
5. after stirring finishes, rise stirring-head, the sampling thermometric.
6. take off the back slag, hang hot metal ladle, make steel to the converter hot metal charging.
⑶ handle back molten iron situation:
Molten iron S 0.001%, 1270 ℃ of molten iron temperatures
Comparative Examples 2: existing KR desulfurization, conventional whipping appts and stirring-head (non-hollow)
⑴ molten iron situation before handle: with embodiment 2.
⑵ desulfurization treating processes:
1. after iron ladle gets into the processing station of skimming, topple over certain angle, slag before having taken off;
2. behind the slag, iron ladle is reformed, and iron ladle is moved to the desulphurisation treater position before having taken off;
3. add small-particle sweetening agent CaC to the molten iron liquid level
2(granularity requires 0.4 ~ 1.0mm to account for more than 80%, to improve the desulfuration efficiency of sweetening agent) 1.5 tons.
4. the stirring-head that progressively descends is opened stirring and is dropped to working position (the following 1500mm of molten iron liquid level), and the stirring-head rotating speed progressively increases, when reaching 110 commentaries on classics, and invariablenes turning speed.This moment, desulphurization reaction speed reached maximum, and molten iron carries out desulfurization, lasts 15min.
5. strong mixing 15 minutes is after analyze molten iron S 0.005%, 1240 ℃ of molten iron temperatures.
6. add 0.5 ton of small-particle sweetening agent to the molten iron liquid level once more, continue to stir 3min.
7. through analyzing molten iron S 0.003%, 1227 ℃ of molten iron temperatures.Do not reach the pre-treatment target call, but processing excessive cycle and temperature drop are excessive, end treatment.
8. after stirring finishes, rise stirring-head, the sampling thermometric.
9. take off the back slag, hang hot metal ladle, make steel to the converter hot metal charging.
⑶ handle back molten iron situation:
Molten iron S 0.003%, 1227 ℃ of molten iron temperatures.
With above-mentioned foundation desirable embodiment of the present invention is enlightenment, and through above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.The technical scope of this invention is not limited to the content on the specification sheets, must confirm its technical scope according to the claim scope.
Claims (5)
1. KR stirring desulphurization device that dusts; The drive unit (2) that comprises stirring-head (1) and control stirring-head (1) action; Described drive unit (2) comprises the stirring motor (23) that a connecting rod (21) that connects stirring-head (1), lifting device (22) and drive link (21) that drive link (21) moves up and down are rotated; It is characterized in that: also have charging system (3) and high-pressure air source (4); Have the through hole (11) of logical high-pressure inert gas and sweetening agent on the described stirring-head (1), described through hole (11) import is communicated with the sweetening agent outlet and high-pressure air source (4) outlet of charging system (3).
2. the KR as claimed in claim 1 stirring desulphurization device that dusts; It is characterized in that: described connecting rod (21) is a hollow tube; The lower end of hollow tube detachably connects with stirring-head (1) and the mouth of pipe of hollow tube and through hole (11) sealed butt joint of stirring-head (1); The top of hollow tube is provided with sweetening agent import (211) and high pressure gas import (212); Described sweetening agent import (211) is passed through pipeline connection with the sweetening agent outlet of charging system (3), and the high pressure gas import (212) of hollow tube is passed through pipeline connection with the high-pressure air source outlet.
3. according to claim 1 or claim 2 the KR stirring desulphurization device that dusts, it is characterized in that: described stirring-head (1) is the cruciform stirring-head, and described through hole (11) is opened in the hub position of stirring-head (1).
4. the KR as claimed in claim 1 stirring desulphurization device that dusts; It is characterized in that: described charging system (3) comprises the storage hopper (31) of depositing sweetening agent and the metering hopper (32) that feeds intake, and described storage hopper (31) is positioned at metering hopper (32) top that feeds intake.
5. use like each described KR of claim 1 to 4 and dust the stirring desulphurization device, may further comprise the steps the method for desulfurizing iron:
1. open lifting device (22), when stirring-head (1) moves to apart from molten iron liquid level top 2～10cm, open high-pressure air source (4) and spray into rare gas element, make the agent of carrier gas blowing desulfurization, carrier gas flux 10 ~ 50Nm
3/ h, nebulizer gas pressure are 0.3 ~ 1.2MPa;
2. after carrier gas is opened; Open charging system (3); Bring the sweetening agent in the feed bin into transfer line, through stirring-head (1) the end ejection of hollow, the sweetening agent operational throughput is 0.05 ~ 0.5t/min to sweetening agent under the rare gas element effect that high-pressure air source (4) feeds;
3. open stirring motor (23) and drive stirring-head (1) and stir and continue to drop to the working position, stirring-head (1) rotating speed progressively increases, when reaching 80 ~ 120 when changeing; Invariablenes turning speed; This moment, desulphurization reaction speed reached maximum, and molten iron carries out dark desulfurization, lasted to accomplish desulfurization behind 2 ~ 6min and handle.
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Application publication date: 20120919 |