CN103074463A - Operation method of lifting lance in the midway of converter steelmaking under dry dedusting condition - Google Patents
Operation method of lifting lance in the midway of converter steelmaking under dry dedusting condition Download PDFInfo
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- CN103074463A CN103074463A CN2013100015661A CN201310001566A CN103074463A CN 103074463 A CN103074463 A CN 103074463A CN 2013100015661 A CN2013100015661 A CN 2013100015661A CN 201310001566 A CN201310001566 A CN 201310001566A CN 103074463 A CN103074463 A CN 103074463A
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Abstract
The invention relates to an operation method of lifting a lance in the midway of converter steelmaking under a dry dedusting condition, and belongs to the technical field of converter steelmaking operation process. The technical scheme is as follows: 1, lifting the lance to completely dump dregs; 2, standing for three minutes; 3, adding 500 jin of silicon iron; 4, swinging a converter forwards and backwards; 5, flushing nitrogen for 60 seconds; 6, descending the lance to observe components; and 7, enabling the oxygen lance to follow slowly. Therefore, the operation method provided by the invention is also called a seven-step operation method of lifting the lance in the midway of converter steelmaking under the dry dedusting condition. The operation method has the beneficial effects that the explosion limit of the mixed gas of CO and O2 is effectively kept away, so that the explosion venting is avoided. Practice shows that the implementation of the seven-step processing method of lifting the lance in the midway achieves zero explosion venting, so that the production rhythm of the converter is stabilized to the greatest extent, the capacity of the converter is increased, and the service life of an electrostatic precipitator is prolonged.
Description
Technical field
The present invention relates to converter steelmaking blunderbuss working method midway under a kind of dry method dust condition, belong to converter operation Technology field.
Background technology
At present, newly-built large-scale steel mill adopts dry dedusting technology more, and the advantage of this technology is: water saving, economize on electricity, environmental protection and economy.Wherein electrostatic precipitator is the nucleus equipment of dry-dedusting system; the electric precipitation detonation discharge Analysis on Mechanism is as follows: at the initial stage of bessemerizing; because what be full of in flue and the fly-ash separator is air; contain the oxygen about 21%; when bessemerizing beginning; oxygen will with molten iron in C reaction produce a large amount of CO; along with the CO that carries out that blows enters in the flue gas more and more; when the oxygen of CO and front when melting concn reaches limits of explosion in fly-ash separator; namely produce blast under the effect of electrostatic precipitator electrical spark, when the pressure of blast formation surpasses 2.5kpa, the fly-ash separator explosion venting valve will be opened automatically; electric field is shielded, be referred to as venting of dust explosion.In the process of bessemerizing, especially in the middle and later periods, because this moment, slagformation period finished, bath temperature also reaches the temperature of the rapid oxidation of carbon, in this case, the rifle reaction between carbon and oxygen that begins to blow is just very violent under the secondary, CO produces rapidly, if the CO that produces is not entered electrostatic precipitator by perfect combustion at fire door, electrostatic precipitator inner with open blow before air in the flue mix, thereby in electrostatic precipitator, produce larger blast, blowing is interrupted.Therefore, prevent that fly-ash separator generation venting of dust explosion from becoming emphasis and the difficult point of converter smelting.According to statistics, Baogang, Handan are precious, Shoudu Iron and Steel Co Jing Tang Iron And Steel Company (Cao Feidian) is using per month venting of dust explosion 2-3 time of dry dedusting technology operation period average, and Xinyang steel mill is at operation initial stage venting of dust explosion 4-5 time at least per month.The blunderbuss accident especially occurs mid-term in decarburization in converter in converting process, very harmful because dealing with the venting of dust explosion that again descends rifle to occur improperly, gently then causes to produce and interrupts, the heavy then fried whole electrostatic precipitator even cause the generation of fatal accident of giving up.Therefore, it is most important that the processing of science is carried out in the blunderbuss midway that blowing is entered carbon period.
Summary of the invention
The object of the invention provides under a kind of dry method dust condition converter steelmaking blunderbuss working method midway can avoid CO and O effectively
2Thereby the limits of explosion of mixed gas reaches the generation of avoiding venting of dust explosion, solves the problems referred to above that exist in the background technology.
Technical scheme of the present invention is: converter steelmaking blunderbuss working method midway under a kind of dry method dust condition comprises following steps:
1. play at once deslagging behind the rifle, search the blunderbuss reason; When entering carbon period, put aside converter smelting the FeO of quite a few in the slag, grate at once after the blunderbuss midway, as much as possiblely outwell most of oxidation sludge, be unlikely to like this to make the FeO in the slag when again descending rifle rapidly with the molten bath in C react and produce a large amount of CO gases, effectively avoid the generation of venting of dust explosion;
2. again descend the rifle time will with play interval 3-5 minute at least rifle time, be conducive to like this make the CO gas of high density to be got rid of from whole dry-dedusting system;
3. add ferrosilicon 1.1-1.7kg/t steel, effect be feed when again descending rifle the oxygen in molten bath at first with pasc reaction, the oxidation rate that can slow down like this carbon in the molten bath, the least possible generation CO gas is avoided the venting of dust explosion point of coal gas to greatest extent;
4. significant grate shakes to ± 45 ° before and after, and the furnace charge or the slag that swim on the half steel liquid level after the blowing out are midway scatter, and exposed half steel liquid level guarantees once to descend rifle to light a fire successfully as much as possible;
5. manually open the nitrogen purging flue more than one minute before descending rifle, effect is the oxygen in the dilution tunnel Air, when making its blowing below the fast-descending to 6%; Another effect is the concentration of diluting the CO that and then produces, slow down the rising speed of CO, simultaneously, also be to utilize N2 to form a kind of piston-type flue gas post. promote air remaining in the flue always and discharge to diffusing chimney, reduce oxygen concentration, avoid " 6,9 point of crossing ", namely CO concentration reaches the 9%(concentration expressed in percentage by volume, together lower), O
2Reach 6%, this stagnation point is that the venting of dust explosion of empirical value produces constantly;
6. again descend rifle, observe the dry method evaporative cooler EC of system and the electrostatic precipitator EP O of place
2With CO content situation, the stokehold is ready to respectively lime, light dolomite, each 1.7-2.9kg/t steel of unprocessed dolomite, with the splash that prevents that soft blow from bringing; After igniting is normal, work as O
2Be down to below 6%, CO does not rise to 9% when above, begin to add lime, each 1.7-2.9kg/t steel of light dolomite, if reaction in furnace excess Temperature, add unprocessed dolomite 1.7-2.9kg/t steel, so both can slow down the molten bath heat-up rate, postpone the arrival of quick carbon period, suitable multiviscosisty slag prevents the splash that brings because of rifle soft blow under the secondary effectively again; In addition, experience shows at O
2Fall movable gas hood when content reaches 10% and be conducive to fast prompt drop oxygen;
7. optimize rifle position and oxygen blast flow control; Rifle is lighted a fire successfully and is not caused the undue foaming of bits and occur under the prerequisite of large spray under guaranteeing, the rifle position is raised in igniting as far as possible, is controlled at 1.9-2.2 rice, is lighting a fire successfully, after observation fire door flame is stable, slowly with the extremely normal rifle position 1.3-1.4m that blows of rifle; Adopt the main purpose of this rifle bit pattern to be: to slow down as far as possible the formation speed of opening CO when blowing, effectively avoid CO and O
2 Thereby the limits of explosion of mixed gas reaches the generation of avoiding venting of dust explosion.
The described ferrosilicon step that adds, if have in the situation of Bottom Blowing, manually the bottom blowing flow is transferred to maximum value, thereby can impel like this in the slag C among the FeO and molten bath to react and reduce oxidisability in the slag, the oxygen that feeds when again descending the rifle blowing at first reacts with slag, thereby can slow down the formation speed of CO.
Operation steps of the present invention is summed up and can be summarized as:
Play the evacuation of rifle slag;
Left standstill three minutes;
500 jin of ferrosilicon;
Stove rocks back and forth;
Nitrogen flushing 60 seconds;
Lower rifle is seen composition;
The oxygen rifle is slowly followed, so the present invention is also referred to as " seven step of converter steelmaking blunderbuss midway methodology under the dry method dust condition ".
The technology of the present invention characteristics: in the process of bessemerizing, the major cause of blunderbuss of having an accident comprises the chain warning of various category-As, serious splash occurs, dry method dust is reported to the police or show " suddenly stopping " signal etc., what the present invention is directed to that above a variety of causes causes carries rifle midway, after having analyzed concrete reason and venting of dust explosion mechanism, learn in conjunction with inspection information: the aerial limits of explosion scope of CO is 12.5%--74.2%, and what prevent venting of dust explosion is exactly to control CO and O in the converter gas
2Melting concn do not reach limits of explosion, in order to prevent the generation of venting of dust explosion, " 6,9 carry the rifle interlocking " set in the stokehold, namely CO surpasses 9%, O
2When surpassing 6%, the automatic blow off of system is carried rifle, simultaneously, sums up " seven step methodologys " by on-the site analysis, effectively prevents venting of dust explosion to occur.
Beneficial effect of the present invention is: can effectively avoid CO and O
2Thereby the limits of explosion of mixed gas reaches the generation of avoiding venting of dust explosion.Practice shows: the enforcement by seven step of blunderbuss midway facture, obtain zero venting of dust explosion achievement, and farthest stablized the converter rhythm of production, improved the converter production capacity, prolonged the work-ing life of electric precipitation.
Description of drawings
Fig. 1 is rifle rifle bitmap under the secondary of the present invention;
Fig. 2 is rifle oxygen flow trend graph under the secondary of the present invention;
Embodiment
By the following examples (present embodiment is 150 tons of converters) the present invention will be further described.
Converter steelmaking blunderbuss working method midway under a kind of dry method dust condition comprises following steps:
1. play at once deslagging behind the rifle, search the blunderbuss reason; When entering carbon period, put aside converter smelting the FeO of quite a few in the slag, grate at once after the blunderbuss midway, as much as possiblely outwell most of oxidation sludge, be unlikely to like this to make the FeO in the slag when again descending rifle rapidly with the molten bath in C react and produce a large amount of CO gases, effectively avoid the generation of venting of dust explosion;
2. again descend the rifle time to be conducive to like this make the CO gas of high density to be got rid of from whole dry-dedusting system more than 3 minutes in the interval at least with a rifle time;
3. add ferrosilicon 250 kg, effect be feed when again descending rifle the oxygen in molten bath at first with pasc reaction, the oxidation rate that can slow down like this C in the molten bath, the least possible generation CO gas is avoided the venting of dust explosion point of coal gas to greatest extent; If have in the situation of Bottom Blowing, manually the bottom blowing flow is transferred to maximum value, reduce oxidisability in the slag thereby can impel like this in the slag C among the FeO and molten bath to react, the oxygen that feeds when again descending the rifle blowing at first reacts with slag, thereby can slow down the formation speed of CO.
4. significant grate shakes to ± 45 ° before and after, and the furnace charge or the slag that swim on the half steel liquid level after the blowing out are midway scatter, and exposed half steel liquid level guarantees once to descend rifle to light a fire successfully as much as possible;
5. manually open the nitrogen purging flue more than one minute before descending rifle, effect is the oxygen in the dilution tunnel Air, when making its blowing below the fast-descending to 6%; Another effect is the concentration of diluting the CO that and then produces, slow down the rising speed of CO, simultaneously, also be to utilize N2 to form a kind of piston-type flue gas post. promote air remaining in the flue always and discharge to diffusing chimney, reduce oxygen concentration, avoid " 6,9 point of crossing ", namely CO concentration reaches 9%, O
2Reach 6%, this stagnation point is that the venting of dust explosion of empirical value produces constantly;
6. again descend rifle, observe the dry method evaporative cooler EC of system and the electrostatic precipitator EP O of place
2With CO content situation, the stokehold is ready to respectively lime, light dolomite, unprocessed dolomite, each 300-500k
g, with the splash that prevents that soft blow from bringing; After igniting is normal, work as O
2Be down to below 6%, CO does not rise to 9% when above, begins to add lime, each 300-500k of light dolomite
gIf the reaction in furnace excess Temperature adds unprocessed dolomite 300kg
,So both can slow down the molten bath heat-up rate, and postpone the arrival of quick carbon period, suitable multiviscosisty slag prevents the splash that brings because of rifle soft blow under the secondary effectively again; In addition, experience shows at O
2Fall movable gas hood when content reaches 10% and be conducive to fast prompt drop oxygen;
7. optimize rifle position and oxygen blast flow control; Rifle is lighted a fire successfully and is not caused the undue foaming of bits and occur under the prerequisite of large spray under guaranteeing, the rifle position is raised in igniting as far as possible, is controlled at 1.9-2.2 rice, is lighting a fire successfully, after observation fire door flame is stable, slowly with the extremely normal rifle position 1.3-1.4m that blows of rifle; Adopt the main purpose of this rifle bit pattern to be: to slow down as far as possible the formation speed of opening CO when blowing, effectively avoid CO and O
2 Thereby the limits of explosion of mixed gas reaches the generation of avoiding venting of dust explosion.
Under the converter secondary in the rifle converting process, feed oxygen and the molten steel speed of reaction in molten bath for strict control, through checking that repeatedly the rifle soft blow time is decided to be 120 seconds under the flue gas content analysis is with secondary, rifle leaves the wind drift amount and is made as 45% of normal full flow blowing under the secondary, and the oxygen flow when then progressively raising stage by stage flow to normal blowing (is generally 32000-34000M
3/ h).Accompanying drawing 1 is rifle rifle bitmap under the embodiment secondary, and accompanying drawing 2 is rifle oxygen flow trend graph under the embodiment secondary, and a rifle time period oxygen flow sees the following form under the secondary:
Present embodiment is two 150 tons of converters of certain steelworks, and these two 150 tons of converter dry dedusting technologies are after using patent of the present invention to operate, and going into operation, together venting of dust explosion does not occur so far.
Claims (2)
1. converter steelmaking blunderbuss working method midway under the dry method dust condition is characterized in that comprising following steps:
1. play at once deslagging behind the rifle, grate at once after the blunderbuss is midway as much as possiblely outwelled most of oxidation sludge;
2. again descend the rifle time will with play interval 3-5 minute at least rifle time;
3. add ferrosilicon 1.1-1.7kg/t steel;
4. significant grate shakes to ± 45 ° before and after, as much as possible exposed half steel liquid level;
5. manually open the nitrogen purging flue more than one minute before descending rifle, the oxygen in the dilution tunnel Air makes its when blowing below the fast-descending to 6%; The concentration of the CO that and then dilution produces simultaneously, utilizes N2 to form a kind of piston-type flue gas post. and promote air remaining in the flue and discharge to diffusing chimney;
6. again descend rifle, observe the dry method evaporative cooler EC of system and the electrostatic precipitator EP O of place
2With CO content situation, the stokehold is ready to respectively lime, light dolomite, unprocessed dolomite, each 1.7-2.9kg/t steel; After igniting is normal, work as O
2Being down to concentration expressed in percentage by volume is 4%-6%, when the CO concentration expressed in percentage by volume does not rise to 9%, begins to add lime, each 1.7-2.9kg/t steel of light dolomite, if the reaction in furnace excess Temperature adds unprocessed dolomite 1.7-2.9kg/t steel;
7. optimize rifle position and oxygen blast flow control; Rifle is lighted a fire successfully and is not caused the undue foaming of bits and occur under the prerequisite of large spray under guaranteeing, the rifle position is raised in igniting as far as possible, is controlled at 1.9-2.2 rice, is lighting a fire successfully, after observation fire door flame is stable, slowly with the extremely normal rifle position 1.3-1.4m that blows of rifle.
2. converter steelmaking blunderbuss working method midway under a kind of dry method dust condition according to claim 1 is characterized in that: describedly add the ferrosilicon step, if having in the situation of Bottom Blowing, manually the bottom blowing flow is transferred to maximum value.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103509907A (en) * | 2013-10-25 | 2014-01-15 | 武汉钢铁(集团)公司 | Magnesium-matched slag-making method using raw dolomite in converter combined blowing |
| 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 |
| CN105331765A (en) * | 2015-11-26 | 2016-02-17 | 宣化钢铁集团有限责任公司 | Method for secondary gun feeding blowing of dry dust removing converter |
| CN106544465A (en) * | 2015-09-17 | 2017-03-29 | 鞍钢股份有限公司 | A kind of control method for preventing converter dry dedusting early stage venting of dust explosion |
| 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 |
| CN107805683A (en) * | 2017-11-06 | 2018-03-16 | 河钢股份有限公司承德分公司 | The method for preventing electrostatic precipitation venting of dust explosion during the double slag meltings of converter |
| CN109913612A (en) * | 2019-03-06 | 2019-06-21 | 鞍钢股份有限公司 | A kind of control method of the environmentally protective smelting of converter |
| CN110527776A (en) * | 2019-09-27 | 2019-12-03 | 山东钢铁股份有限公司 | The unsuccessful processing method of piping and druming fire is opened in a kind of converter |
| CN110735014A (en) * | 2019-10-29 | 2020-01-31 | 攀钢集团西昌钢钒有限公司 | method for blowing steel in furnace to reduce explosion and deflagration rate and explosion venting rate by dry dedusting |
| CN112646943A (en) * | 2020-12-17 | 2021-04-13 | 攀钢集团西昌钢钒有限公司 | Method for controlling dry dedusting explosion venting in semisteel smelting |
| CN113215346A (en) * | 2021-05-19 | 2021-08-06 | 宝武集团鄂城钢铁有限公司 | Smelting method for reducing explosion venting incidence rate of converter |
| CN113699302A (en) * | 2021-08-03 | 2021-11-26 | 邯郸钢铁集团有限责任公司 | Secondary lance discharging control method for accident lance lifting in converter smelting process |
| CN115287389A (en) * | 2022-07-18 | 2022-11-04 | 山东莱钢永锋钢铁有限公司 | Converter less-slag smelting method |
| CN115652015A (en) * | 2022-10-31 | 2023-01-31 | 山东莱钢永锋钢铁有限公司 | Method for avoiding explosion venting in dry dedusting double-slag operation of converter |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103509907A (en) * | 2013-10-25 | 2014-01-15 | 武汉钢铁(集团)公司 | Magnesium-matched slag-making method using raw dolomite in converter combined blowing |
| CN103509907B (en) * | 2013-10-25 | 2015-11-18 | 武汉钢铁(集团)公司 | Join the method for magnesium slag making with unprocessed dolomite in a kind of Blowing Converter |
| CN106544465A (en) * | 2015-09-17 | 2017-03-29 | 鞍钢股份有限公司 | A kind of control method for preventing converter dry dedusting early stage venting of dust explosion |
| CN106544465B (en) * | 2015-09-17 | 2018-08-03 | 鞍钢股份有限公司 | A kind of control method preventing converter dry dedusting venting of dust explosion early period |
| CN105331765A (en) * | 2015-11-26 | 2016-02-17 | 宣化钢铁集团有限责任公司 | Method for secondary gun feeding blowing of dry dust removing converter |
| 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 |
| CN107805683A (en) * | 2017-11-06 | 2018-03-16 | 河钢股份有限公司承德分公司 | The method for preventing electrostatic precipitation venting of dust explosion during the double slag meltings of converter |
| CN109913612A (en) * | 2019-03-06 | 2019-06-21 | 鞍钢股份有限公司 | A kind of control method of the environmentally protective smelting of converter |
| CN110527776A (en) * | 2019-09-27 | 2019-12-03 | 山东钢铁股份有限公司 | The unsuccessful processing method of piping and druming fire is opened in a kind of converter |
| CN110735014A (en) * | 2019-10-29 | 2020-01-31 | 攀钢集团西昌钢钒有限公司 | method for blowing steel in furnace to reduce explosion and deflagration rate and explosion venting rate by dry dedusting |
| CN112646943A (en) * | 2020-12-17 | 2021-04-13 | 攀钢集团西昌钢钒有限公司 | Method for controlling dry dedusting explosion venting in semisteel smelting |
| CN113215346A (en) * | 2021-05-19 | 2021-08-06 | 宝武集团鄂城钢铁有限公司 | Smelting method for reducing explosion venting incidence rate of converter |
| CN113215346B (en) * | 2021-05-19 | 2022-06-14 | 宝武集团鄂城钢铁有限公司 | Smelting method for reducing explosion venting incidence rate of converter |
| CN113699302A (en) * | 2021-08-03 | 2021-11-26 | 邯郸钢铁集团有限责任公司 | Secondary lance discharging control method for accident lance lifting in converter smelting process |
| CN115287389A (en) * | 2022-07-18 | 2022-11-04 | 山东莱钢永锋钢铁有限公司 | Converter less-slag smelting method |
| CN115287389B (en) * | 2022-07-18 | 2024-04-09 | 山东莱钢永锋钢铁有限公司 | Smelting method for converter with less slag |
| CN115652015A (en) * | 2022-10-31 | 2023-01-31 | 山东莱钢永锋钢铁有限公司 | Method for avoiding explosion venting in dry dedusting double-slag operation of converter |
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Application publication date: 20130501 |