CN102925621A - Method for preventing dry dedusting system of semi-steel steel converter from explosion venting - Google Patents
Method for preventing dry dedusting system of semi-steel steel converter from explosion venting Download PDFInfo
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- CN102925621A CN102925621A CN2012104536004A CN201210453600A CN102925621A CN 102925621 A CN102925621 A CN 102925621A CN 2012104536004 A CN2012104536004 A CN 2012104536004A CN 201210453600 A CN201210453600 A CN 201210453600A CN 102925621 A CN102925621 A CN 102925621A
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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
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Abstract
The invention provides a method for preventing a dry dedusting system of a semi-steel steel converter from explosion venting. The method for preventing the dry dedusting system of the semi-steel steel converter from explosion venting comprises three steps, wherein a first step is that the quantity of residue slag is controlled to be 2 * 10 <-3> to 4 * 10 <-3> times of the furnace volume of the steel converter, a second step is that after the slag in the steel converter is wrapped and dry, molten iron is blended into the slag, and at the same time, the rotating speed of a fan is controlled to be 300-500 revolutions per minute, a third step is that a gun is moved downwards for ignition, no carburant is added when the gun is moved downwards, after the start of converting, the volume content of oxygen in flue gas is detected, and after the volume content of the oxygen is not higher than 5%, slagging materials are added into the steel converter. By means of the method for preventing the dry dedusting system of the semi-steel steel converter from explosion venting, times of explosion venting of the dry dedusting system of the semi-steel steel converter can be reduced, and therefore an electrostatic dust removal device can be protected, the service life of a dry dedusting device can be prolonged, and production time can be saved.
Description
Technical field
The present invention relates to semi-steel making converter dry dedusting technology field, more particularly, relate to a kind of method that can prevent the dry-dedusting system venting of dust explosion of semi-steel making converter.
Background technology
The traditional wet dedusting technology (OG method) of the many employings of the existing converter coal gas purification of China and recovery system, automatic control level and coal-gas recovering amount are all lower, and the dust content of gas after the purification still reaches 100mg/m
3, the recovery system energy consumption is larger, and the ton steel process energy consumption of converter steelmaking is 23.6kg mark coal.At the initial stage sixties, the dry dust collection method of converter by German LURGI and the cooperative development of Thyssen steel mill is called for short the LT method, and this method for dust removal began to apply the beginning of the eighties; The ultimate principle of converter dry dedusting technology is to the cooling of spraying water through the high-temperature flue gas behind the gasification cooling flue, and flue-gas temperature is reduced to about 200 ℃ by 900 ℃～1000 ℃, adopts electric precipitator to process again.The converter dry dust-removal system mainly comprises: gasification cooling flue, evaporative cooler (EC), electrostatic precipitator (EP), coal gas switching station, gas cooler (GC), diffusion system, ash-transmission system etc.
In the prior art, dry dedusting technology ton steel dust content of gas can reach 10mg/m
3, steel-making ton steel process energy consumption is only for below the 10kg mark coal.Therefore, the converter gas dry dedusting technology is acknowledged as the from now on developing direction of metallurgical dust-removal system.
Yet, in the prior art, because steelmaking process not only will produce coal gas of converter, but also can suck the minimum dust granules of particle, coal gas of converter belongs to inflammable and explosive medium, in the electric precipitation process of dry-dedusting system, bad the coal gas venting of dust explosion will occur in case control, and contain the minimum dust of particle and part metals iron powder in the dust granules that steelmaking process sucks, the dust venting of dust explosion will not occur if this part material obtains good control.Therefore; electrostatic precipitator all is equipped with explosion venting device; play the effect of safeguard protection; in case blast in the fly-ash separator, explosion venting device can automatically be opened gas with burning expansion and in time discharge and can automatically reset, and has reduced the destructiveness to electrostatic precipitator; thereby guaranteed the electrostatic precipitator long-time running; but how each venting of dust explosion also can to the equipment injury, therefore, prevent that venting of dust explosion from becoming the important factor that prolongs the dry-dedusting system life-span.
In existing patent documentation, publication number is that the Chinese patent application of CN102344987A has openly disclosed flue gas dry-process dust removing process of a kind of converter; Publication number is that the Chinese patent application of CN101570808A has openly disclosed a kind of converter gas dry-dedusting system and explosion-proof equipment thereof; Publication number is that the Chinese patent application of CN102010928A has openly disclosed a kind of converter oxygen gun blowing control method based on dry dedusting technology; Publication number is that the Chinese patent application of CN101892343A has openly disclosed a kind of converter gas dry-dedusting system and using method thereof; Publication number is the method that the Chinese patent application of CN101619375A has openly disclosed a kind of preventing electric precipitation detonation discharge of top and bottom blown converter.Yet these Patent Application Publications are all mainly concentrated and have been set forth the using method of dry-dedusting system or how to have prevented coal gas venting of dust explosion (CO, H
2), all unexposed for the method for the dust venting of dust explosion in the dry-dedusting system that how to prevent the semi-steel making converter.
Summary of the invention
For at least one in the prior art above shortcomings, one of purpose of the present invention is to provide a kind of method that can prevent semi-steel making converter dry dust-removal system venting of dust explosion.
The invention provides a kind of method that prevents semi-steel making converter dry dust-removal system venting of dust explosion, said method comprising the steps of: the quantity of slag of staying of control converter is 2 * 10
-3～4 * 10
-3Times converter heat size; Slag in converter is blended into molten iron after wrapping up in and doing, and controlling simultaneously rotation speed of fan is 300～500rpm; Lower rifle igniting does not add carburelant in lower rifle; After the blowing beginning, detect the volume content of the oxygen in the flue gas, be not more than after 5% at the oxygen volume content, in converter, add slag making materials.
In a preferred exemplary embodiment of the present invention, the described step that is blended into molten iron is 50～90t/min with the speed control that is blended into of molten iron.
In a preferred exemplary embodiment of the present invention, the described step that adds slag making materials in the converter adopts multiple batches of adding mode, and the add-on of every batch of control slag making materials is 500～1000kg.
In a preferred exemplary embodiment of the present invention, described method also comprises: after the described step that is blended into molten iron, slowly rock converter, to guarantee that when the lower rifle igniting molten iron surface is without the big area coverture in the converter.
In a preferred exemplary embodiment of the present invention, described method also comprises: described method also be included in described slag wrap up in do after, first in converter, add steel scrap, then be blended into molten iron, and the weight of controlling the thin material in the described steel scrap is no more than 15% of steel scrap gross weight.
Compared with prior art, beneficial effect of the present invention comprises: can reduce the number of times of semi-steel making converter dry dust-removal system venting of dust explosion, thereby can protect electrostatic dust collection equipment, prolong dry dust removal equipment work-ing life, save the production time.
Embodiment
Hereinafter, describe the method that prevents semi-steel making converter dry dust-removal system venting of dust explosion of the present invention in detail in connection with exemplary embodiment.
In one exemplary embodiment of the present invention, adopt dry-dedusting system that the flue gas (wherein, containing CO, minimum dust granules and the part metals iron powder of particle) that the half steel steel-making converter produces is purified and reclaims.In the present embodiment, the method that prevents semi-steel making converter dry dust-removal system venting of dust explosion may further comprise the steps: the quantity of slag of staying of control converter is 2 * 10
-3～4 * 10
-3Times converter heat size; Slag in converter is blended into molten iron (referred to as converting iron) after wrapping up in and doing, and controlling simultaneously rotation speed of fan is 300～500rpm; Lower rifle igniting does not add carburelant in lower rifle; After the blowing beginning, detect the volume content of the oxygen in the flue gas, be not more than after 5% at the oxygen volume content, in converter, add slag making materials.
In another exemplary embodiment of the present invention, preferably, the step that is blended into molten iron is 50～90t/min with the speed control that is blended into of molten iron.
In another exemplary embodiment of the present invention, preferably, the step that adds slag making materials in the converter adopts multiple batches of adding mode, and the add-on of every batch of control slag making materials is 500～1000kg.
In another exemplary embodiment of the present invention, described method preferably also comprises: after the described step that is blended into molten iron, slowly rock converter, to guarantee that when the igniting of lower rifle the molten iron surface is without big area (for example, accounting for the area more than 80% on whole molten iron surface) coverture in the converter.
In another exemplary embodiment of the present invention, described method preferably also comprises: described slag wrap up in do after, in converter, add steel scrap first, then be blended into molten iron, and the weight of controlling the thin material in the described steel scrap is no more than 15% of steel scrap gross weight.
In another exemplary embodiment of the present invention, the described method of semi-steel making converter dry dust-removal system venting of dust explosion that prevents also can realize in the following ways:
(1) quantity of slag is stayed in control according to the converter situation, will stay the quantity of slag to be controlled to be 2 * 10
-3～4 * 10
-3Times converter heat size, for example, for the 200t converter, it stays the quantity of slag can be 400～800kg.
(2) convert before the iron, confirm situation in the stove, the residue slag can be converted iron after wrapping up in and doing in the stove, and the rotating speed of controlling simultaneously blower fan is 300～500rpm.
(3) employing adds first the loading pattern that steel scrap is converted iron again, and the weight of thin material (thin material refers to the ferrous material that granularity is little, impurity is many in the steel scrap, such as hot rolling iron scale, cold-rolled steel coils bound feet groove bits, the outer addendum of continuously cast bloom etc.) is no more than 15% of steel scrap gross weight in the control steel scrap.
When (4) converting iron, will convert the iron speed control and be 50～90t/min to reduce the flue dust generation, and convert after the iron, and slowly descend rifle behind the grate back and forth again, the operation of feeding in raw material again after rifle burns fire under the affirmation forbids adding carburelant in the time of lower rifle.Do not catch fire if find not beat, must carry immediately rifle, carry rifle after grate guarantee again to descend rifle after the molten iron surface is without the big area coverture.
(5) after lower rifle is opened and blown, wait O in the flue gas
2After volume content≤5%, in converter, add slag making materials.
(6) step that adds slag making materials in the converter adopts multiple batches of adding mode, forbids concentrating reinforced, and the add-on of every batch of control slag making materials is 500～1000kg,
In order to understand better above-mentioned exemplary embodiment of the present invention, below in conjunction with concrete example it is further specified.
Comparative Examples 1
Certain 200t of company semi-steel making converter adopts dry-dedusting system (DDS) that flue gas is processed, and dust venting of dust explosion number of times in use occurs per month reached 3 times.Slag making materials is quickened lime, light dolomite and composite fluxing medium in this Comparative Examples, and half steel is the molten steel after vanadium extraction by converter blowing.
Example 1
Employing following methods for 200t semi-steel making converter in the above-mentioned Comparative Examples 1 carries out flue gas processing and recovery.Be specially: control stays the quantity of slag at the 400kg/ stove; Wrap up in when residue slag in the stove and just to convert iron after doing, simultaneously rotation speed of fan is reduced to 400rpm; Converted after the iron, slowly descended rifle behind the grate back and forth again, the operation of feeding in raw material again after rifle burns fire under confirming forbids adding carburelant in the time of lower rifle; Lower rifle waits O in the flue gas after opening and blowing
2After %≤5%, adding weight is first slag making materials of 500kg.After adding first slag making materials, minute many batches of adding slag making materialses, its add-on is respectively 1000kg, 900kg, 850kg, 1000kg, 700kg, 900kg, 1000kg, 800kg.The slag making materials of this example and molten steel and Comparative Examples 1 are basic identical.After adopting the method for this example, dust venting of dust explosion number of times reduces to 0.5 time/month.
Comparative Examples 2
Certain 200t of company semi-steel making converter adopts dry-dedusting system (DDS) that flue gas is processed, and dust venting of dust explosion number of times in use occurs per month reached 3 times.Slag making materials is quickened lime, light dolomite and composite fluxing medium in this Comparative Examples, and half steel is the molten steel after vanadium extraction by converter blowing.
Example 2
Employing following methods for 200t semi-steel making converter in the above-mentioned Comparative Examples 2 carries out flue gas processing and recovery.Be specially: control stays the quantity of slag at the 800kg/ stove; Wrap up in when residue slag in the stove and just to convert iron after doing, simultaneously rotation speed of fan is reduced to 500rpm; Converted after the iron, slowly descended rifle behind the grate back and forth again, the operation of feeding in raw material again after rifle burns fire under confirming forbids adding carburelant in the time of lower rifle; Lower rifle waits O in the flue gas after opening and blowing
2After %≤5%, adding weight is first slag making materials of 500kg.After adding first slag making materials, add slag making materials in batches, its add-on is respectively 900kg, 1000kg, 950kg, 900kg, 800kg, 1000kg, 950kg, 800kg.The slag making materials of this example and molten steel and Comparative Examples 2 are basic identical.After adopting the method for this example, dust venting of dust explosion number of times reduces to 0.4 time/month.
In sum, method of the present invention can reduce the number of times of semi-steel making converter dry dust-removal system venting of dust explosion greatly, thereby can protect electrostatic dust collection equipment, prolongs dry dust removal equipment work-ing life, saves the production time, in addition, can also save production cost.
Although the above has described the present invention in conjunction with exemplary embodiment, those of ordinary skills should be clear, in the situation of the spirit and scope that do not break away from claim, can carry out various modifications to above-described embodiment.
Claims (5)
1. method that prevents semi-steel making converter dry dust-removal system venting of dust explosion, described dry-dedusting system are used for the flue gas that the half steel steel-making converter produces is purified and reclaims, and it is characterized in that, said method comprising the steps of:
The quantity of slag of staying of control converter is 2 * 10
-3～4 * 10
-3Times converter heat size;
Slag in converter is blended into molten iron after wrapping up in and doing, and controlling simultaneously rotation speed of fan is 300～500rpm;
Lower rifle igniting does not add carburelant in lower rifle;
After the blowing beginning, detect the volume content of the oxygen in the flue gas, be not more than after 5% at the oxygen volume content, in converter, add slag making materials.
2. the method that prevents semi-steel making converter dry dust-removal system venting of dust explosion according to claim 1, the described step that is blended into molten iron is 50～90t/min with the speed control that is blended into of molten iron.
3. the method that prevents semi-steel making converter dry dust-removal system venting of dust explosion according to claim 1, the described step that adds slag making materials in the converter adopts multiple batches of adding mode, and the add-on of every batch of control slag making materials is 500～1000kg.
4. the method that prevents semi-steel making converter dry dust-removal system venting of dust explosion according to claim 1, described method also is included in after the described step that is blended into molten iron, slowly rock converter, to guarantee that when the igniting of lower rifle the molten iron surface is without the big area coverture in the converter.
5. the method that prevents semi-steel making converter dry dust-removal system venting of dust explosion according to claim 1, described method also be included in described slag wrap up in do after, first in converter, add steel scrap, then be blended into molten iron, and the weight of controlling the thin material in the described steel scrap is no more than 15% of steel scrap gross weight.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210453600.4A CN102925621B (en) | 2012-11-13 | 2012-11-13 | Method for preventing dry dedusting system of semi-steel steel converter from explosion venting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210453600.4A CN102925621B (en) | 2012-11-13 | 2012-11-13 | Method for preventing dry dedusting system of semi-steel steel converter from explosion venting |
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| Publication Number | Publication Date |
|---|---|
| CN102925621A true CN102925621A (en) | 2013-02-13 |
| CN102925621B CN102925621B (en) | 2014-07-09 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103184305A (en) * | 2013-03-13 | 2013-07-03 | 河北钢铁股份有限公司承德分公司 | Explosion-proof control method adopting electric precipitation for vanadium extraction in converter |
| CN103320566A (en) * | 2013-06-26 | 2013-09-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting semi-steel through double-slag process |
| CN103555880A (en) * | 2013-10-16 | 2014-02-05 | 河北钢铁股份有限公司承德分公司 | Method for preventing electric precipitation explosion venting during blowing igniting of semi-steel steelmaking |
| CN105603147A (en) * | 2016-03-08 | 2016-05-25 | 唐山钢铁集团有限责任公司 | Converter slag forming process for rapid slagging |
| CN107012283A (en) * | 2016-01-27 | 2017-08-04 | 鞍钢股份有限公司 | Converter slag retention method |
| CN107164598A (en) * | 2017-05-10 | 2017-09-15 | 山东钢铁股份有限公司 | A kind of method for lifting converter sparking effect |
| CN114875200A (en) * | 2022-05-09 | 2022-08-09 | 山东钢铁集团永锋临港有限公司 | Method for preventing corrosion and water leakage of converter oxygen lance nozzle end face under dry dedusting condition |
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| 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 |
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| 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 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103184305A (en) * | 2013-03-13 | 2013-07-03 | 河北钢铁股份有限公司承德分公司 | Explosion-proof control method adopting electric precipitation for vanadium extraction in converter |
| CN103320566A (en) * | 2013-06-26 | 2013-09-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting semi-steel through double-slag process |
| CN103320566B (en) * | 2013-06-26 | 2015-09-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Double slag process smelts the method for half steel |
| CN103555880A (en) * | 2013-10-16 | 2014-02-05 | 河北钢铁股份有限公司承德分公司 | Method for preventing electric precipitation explosion venting during blowing igniting of semi-steel steelmaking |
| CN107012283A (en) * | 2016-01-27 | 2017-08-04 | 鞍钢股份有限公司 | Converter slag retention method |
| CN107012283B (en) * | 2016-01-27 | 2018-10-09 | 鞍钢股份有限公司 | Converter slag retention method |
| CN105603147A (en) * | 2016-03-08 | 2016-05-25 | 唐山钢铁集团有限责任公司 | Converter slag forming process for rapid slagging |
| CN107164598A (en) * | 2017-05-10 | 2017-09-15 | 山东钢铁股份有限公司 | A kind of method for lifting converter sparking effect |
| CN114875200A (en) * | 2022-05-09 | 2022-08-09 | 山东钢铁集团永锋临港有限公司 | Method for preventing corrosion and water leakage of converter oxygen lance nozzle end face under dry dedusting condition |
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