CN102010920A - Method for smelting bell-less top blast furnace high proportion pellet ore burden structure - Google Patents
Method for smelting bell-less top blast furnace high proportion pellet ore burden structure Download PDFInfo
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- CN102010920A CN102010920A CN2010106048364A CN201010604836A CN102010920A CN 102010920 A CN102010920 A CN 102010920A CN 2010106048364 A CN2010106048364 A CN 2010106048364A CN 201010604836 A CN201010604836 A CN 201010604836A CN 102010920 A CN102010920 A CN 102010920A
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Abstract
The invention discloses a method for smelting a bell-less top blast furnace high proportion pellet ore burden structure. Alkalinity of sintering ore is improved to be 2.5-3.5 times or flux with high CaO content is added, the technology that bulk coke is charged at the center and coke is mixed in ore is adopted, a charging method of split charging, ore coke unequal stockline and chute feeder feeding from small angle to high angle is adopted, a tank is reversed regularly, and batch weight of ore is expanded, so that a blast furnace stock column can maintain stable and uniform edge gas flow and strong center gas flow when gas flow passes through; the tuyere theoretical combustion temperature is controlled to be 2200-2300 DEG C; and the operation policy of low silicon and low slag basicity is adopted to smelt. The utilization factor of the blast furnace can be improved by 8-10%; the fuel ratio of the blast furnace can be reduced by 2-3%; and the Si content of pig iron is reduced, the desulphuration capacity is improved, the pig iron quality is improved, the furnace body service life is prolonged to more than eight years, and the blast furnace production stability and the economic benefit are improved. The invention is applicable to the bell-less top blast furnace under the condition that pellet ore in the blast furnace burden structure accounts for 60-100% of the total burden quantity.
Description
Technical field
The invention belongs to the blast furnace smelting process method, particularly a kind of no clock furnace roof blast furnace is pellet burden structure smelting process at high proportion.
Background technology
Because of the demand of enlarging of iron work blast furnace and strengthening smelting, the contradiction that blast furnace improves the grog rate becomes increasingly conspicuous, and goes into the raising of stove grade for protecting blast furnace grog rate and blast furnace.Under original SINTERING PRODUCTION ability, the production of development pellet reaches about 80% blast furnace feeding pellet ratio; Because the singularity that pellet itself is had increases to after 60% at the pellet consumption, smooth operation of furnace production is difficult to guarantee that collapsing the hanging number of times increases, and furnace bosh, bosh are tied thick phenomenon and often taken place, and seriously restrict blast furnace production and technico-economical comparison and improve.
At the pellet burden structure smelting at high proportion of no clock furnace roof blast furnace, at present domestic reaching still do not have better solution in the world; Because when the pellet ratio accounts for furnace charge total amount 60% when above, have the following outstanding problem that solves of needing during smelting: (1) is acid mostly because of pellet, that is: CaO%/SiO
2%＜1.00 need consider that when blast-furnace burden CaO adds in which way; (2) pellet nature angle of rest (repose) is little than the natural angle of rest (repose) of coke, and only 24～27 °, and rollability is good, angle of repose is little; After pellet adds blast furnace, easily roll, make charge level be tending towards smooth; (3) pellet reduction degradation in temperature 570-1000 ℃ interval is comparatively serious in the blast furnace, the about 30%-35% of Pulverization ratio; Along with oxide compound reduces the carrying out in each stage, the cubical expansivity of 20%-25% is arranged under the normal circumstances, have a strong impact on the blast furnace permeability of stock column.(4) the softening beginning of pellet loading reduction softening temperature is on the low side, and is wider between the softened zone, causes blast-furnace bosh coal gas to increase by the cohesive zone resistance.
Summary of the invention
The object of the present invention is to provide a kind of no clock furnace roof blast furnace pellet burden structure smelting process at high proportion, can make and account for furnace charge total amount 60% when above when the pellet ratio, effectively reduce resistance by blast furnace stock column vertical direction center and peripheral coal gas, improve the blast furnace permeability of stock column, reduce blast furnace pressure reduction, guarantee the operation of blast furnace stably manufactured.
Solution of the present invention is: a kind of no clock furnace roof blast furnace is pellet burden structure smelting process at high proportion, its operation steps is as follows: (1) is improved the basicity to 2.5-3.5 times of stove agglomerate or with addition of the flux of high CaO content, is satisfied blast furnace slag making system needs;
(2) no clock furnace roof blast furnace utilizes the polycyclic distributing technology, carries out central coke by 7%-15% of coke (per) charge weight, the centre of development air-flow;
(3) no clock furnace roof blast furnace adopts in the ore deposit and adds burnt technology, utilizes under the groove coke scale hooper elder generation corresponding ore amount coke of weighing to criticize heavy 7%-15%; After treating ore and coke all weighing being ready to, coke and ore gate are opened simultaneously, and ore and coke uniform mixing are packed in the truck, feed in raw material by normal reinforced program; When throttling valve under the furnace roof batch can is opened the burnt compound in ore deposit, back when the furnace roof chute is put into stove, because of coke is little than pellet density, granularity is big, leave the vibrating deflection of chute greater than pellet when in chute, rolling or sliding, and furnace charge is in dropping process, influence because of rising coal gas stream buoyancy in the stove, coke drop point radius of a circle is greater than ore drop point radius of a circle behind the cloth, can form uniform and stable coke layer at ore bed of material edge, play the uniform edge of development stability coal gas stream and prevent the thick effect of furnace wall knot;
(4) when no clock furnace roof blast furnace bucket ore drawing stone and coke, the Changing Pattern of materials flow size composition segregation during according to the batch can blowing, adopt the roof material distributing chute to carry out cloth to the wide-angle direction from Small angle, the small-particle furnace charge and the powder that cause because of the mass flow particle segregation when guaranteeing the batch can blowing, cloth to the blast furnace center to 2/3 place at furnace wall edge;
(5) loading method adopts positive packing, ore deposit Jiao not to wait stockline;
(6) also a jar no clock furnace roof blast furnace need regularly carry out the tank switching operation, prevent because of and during pan furnace top cloth the materials flow drop point in the radius of a circle periodical change, make stock column furnace size composition generation vertical direction segregation in the stove, cause the local over-blowing in blast furnace edge to produce pipeline trip, get final product at least 4 tank switching loop cycles of a stock column inner control;
(7) ore deposit is criticized and heavily is controlled at more than the threshold value, and ore is 10%-12% of a throat diameter at the mean thickness of furnace throat;
(8) by adjusting the blast furnace blowing system, adopt higher theoretical tuyere combustion temperature during blast furnace operating, be controlled between 2200 ℃-2300 ℃;
(9) select low silicon and low basicity of slag to smelt, Si is controlled between the 0.40%-0.60%; R
2Be controlled at 1.04-1.08 doubly.
By following commerical test data contrast as can be seen, the blast furnace that the present invention preferably resolves when the pellet ratio reaches 80% is smelted problem smoothly.
After using this Technology to adjust to the right place, can improve capacity factor of a blast furnace 8%-10%; Reduce blast furnace fuel than 2-3%; The pig iron contain [si ］ descend 0.08%, the pig iron ratio of first-grade products rises 40%, improves iron quality; Prolong more than shaft life-span to 8 year, can significantly improve blast furnace production stability and economic benefit.Use range of the present invention: the pellet ratio accounts for the no clock furnace roof blast furnace under the 60%-100% condition of total furnace charge amount in the blast furnace burden structure.The inventive method is simple, and easy handling can make to account for furnace charge total amount 60% when above when the pellet ratio, effectively reduce resistance by blast furnace stock column vertical direction center and peripheral coal gas, improve the blast furnace permeability of stock column, reduce blast furnace pressure reduction, guarantee the operation of blast furnace stably manufactured.
Embodiment
A kind of no clock furnace roof blast furnace is pellet burden structure smelting process at high proportion, the basicity that at first improves agglomerate to 2.5-3.5 doubly or with addition of the flux of high CaO content, solving the blast furnace slag making system needs; By blast-furnace burden and top filling process, improve the ventilation property of blast furnace stock column vertical direction center and peripheral, form the twice air-flow; The control theoretical tuyere combustion temperature is controlled between 2200 ℃-2300 ℃; Adopt low silicon and low basicity of slag operation policy to smelt.Under the condition that guarantees smooth operation of furnace, improve gas utilization rate, reduce ratio of putting coke into furnace.
Its operation steps is as follows:
(1) basicity of improve the stove agglomerate to 2.5-3.5 doubly or with addition of the flux of high CaO content, satisfy blast furnace slag making system needs;
(2) no clock furnace roof blast furnace utilizes the polycyclic distributing technology, carries out central coke, the centre of development air-flow by the 7%-15% of coke (per) charge weight;
(3) no clock furnace roof blast furnace adopts in the ore deposit and adds burnt technology, utilizes under the groove coke scale hooper elder generation corresponding ore amount coke of weighing to criticize heavy 7%-15%; After treating ore and coke all weighing being ready to, coke and ore gate are opened simultaneously, and ore and coke uniform mixing are packed in the truck, feed in raw material by normal reinforced program; When throttling valve under the furnace roof batch can is opened the burnt compound in ore deposit, back when the furnace roof chute is put into stove, because of coke is little than pellet density, granularity is big, leave the vibrating deflection of chute greater than pellet when in chute, rolling or sliding, and furnace charge is in dropping process, influence because of rising coal gas stream buoyancy in the stove, coke drop point radius of a circle is greater than ore drop point radius of a circle behind the cloth, can form uniform and stable coke layer at ore bed of material edge, play the uniform edge of development stability coal gas stream and prevent the thick effect of furnace wall knot;
(4) when no clock furnace roof blast furnace bucket ore drawing stone and coke, the Changing Pattern of materials flow size composition segregation during according to the batch can blowing, adopt the roof material distributing chute to carry out cloth to the wide-angle direction from Small angle, the small-particle furnace charge and the powder that cause because of the mass flow particle segregation when guaranteeing the batch can blowing, cloth to the blast furnace center to 2/3 place at furnace wall edge;
(5) loading method adopts positive packing, ore deposit Jiao not to wait stockline;
(6) also a jar no clock furnace roof blast furnace need regularly carry out the tank switching operation, prevent because of and during pan furnace top cloth the materials flow drop point in the radius of a circle periodical change, make stock column furnace size composition generation vertical direction segregation in the stove, cause the local over-blowing in blast furnace edge to produce pipeline trip, get final product at least 4 tank switching loop cycles of a stock column inner control;
(7) ore deposit is criticized and heavily is controlled at more than the threshold value, and ore is the 10%-12% of throat diameter at the mean thickness of furnace throat;
(8) by adjusting the blast furnace blowing system, adopt higher theoretical tuyere combustion temperature during blast furnace operating, be controlled between 2200 ℃-2300 ℃;
(9) select low silicon and low basicity of slag to smelt, [Si] is controlled between the 0.40%-0.60%; R
2Be controlled at 1.04-1.08 doubly.
Claims (1)
1. no clock furnace roof blast furnace pellet burden structure smelting process at high proportion is characterized in that its operation steps is as follows: (1) improve the basicity of going into the stove agglomerate to 2.5-3.5 doubly or with addition of the flux of high CaO content, satisfy blast furnace slag making system needs;
(2) no clock furnace roof blast furnace utilizes the polycyclic distributing technology, carries out central coke, the centre of development air-flow by the 7%-15% of coke (per) charge weight;
(3) no clock furnace roof blast furnace adopts in the ore deposit and adds burnt technology, utilizes under the groove coke scale hooper elder generation corresponding ore amount coke of weighing to criticize heavy 7%-15%; After treating ore and coke all weighing being ready to, coke and ore gate are opened simultaneously, and ore and coke uniform mixing are packed in the truck, feed in raw material by normal reinforced program; When throttling valve under the furnace roof batch can is opened the burnt compound in ore deposit, back when the furnace roof chute is put into stove, because of coke is little than pellet density, granularity is big, leave the vibrating deflection of chute greater than pellet when in chute, rolling or sliding, and furnace charge is in dropping process, influence because of rising coal gas stream buoyancy in the stove, coke drop point radius of a circle is greater than ore drop point radius of a circle behind the cloth, can form uniform and stable coke layer at ore bed of material edge, play the uniform edge of development stability coal gas stream and prevent the thick effect of furnace wall knot;
(4) when no clock furnace roof blast furnace bucket ore drawing stone and coke, the Changing Pattern of materials flow size composition segregation during according to the batch can blowing, adopt the roof material distributing chute to carry out cloth to the wide-angle direction from Small angle, the small-particle furnace charge and the powder that cause because of the mass flow particle segregation when guaranteeing the batch can blowing, cloth to the blast furnace center to 2/3 place at furnace wall edge;
(5) loading method adopts positive packing, ore deposit Jiao not to wait stockline;
(6) also a jar no clock furnace roof blast furnace need regularly carry out the tank switching operation, prevent because of and during pan furnace top cloth the materials flow drop point in the radius of a circle periodical change, make stock column furnace size composition generation vertical direction segregation in the stove, cause the local over-blowing in blast furnace edge to produce pipeline trip, get final product at least 4 tank switching loop cycles of a stock column inner control;
(7) ore deposit is criticized and heavily is controlled at more than the threshold value, and ore is the 10%-12% of throat diameter at the mean thickness of furnace throat;
(8) by adjusting the blast furnace blowing system, adopt higher theoretical tuyere combustion temperature during blast furnace operating, be controlled between 2200 ℃-2300 ℃;
(9) select low silicon and low basicity of slag to smelt, Si is controlled between the 0.40%-0.60%; R
2Be controlled at 1.04-1.08 doubly.
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| CN2010106048364A CN102010920A (en) | 2010-12-24 | 2010-12-24 | Method for smelting bell-less top blast furnace high proportion pellet ore burden structure |
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| CN2010106048364A CN102010920A (en) | 2010-12-24 | 2010-12-24 | Method for smelting bell-less top blast furnace high proportion pellet ore burden structure |
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Cited By (21)
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|---|---|---|---|---|
| CN102912049A (en) * | 2012-10-29 | 2013-02-06 | 首钢京唐钢铁联合有限责任公司 | Method for eliminating central coke feeding of blast furnace |
| CN103468838A (en) * | 2013-08-23 | 2013-12-25 | 安阳钢铁股份有限公司 | Blast furnace ironmaking technology adopting high pellet ore proportion |
| CN104364397A (en) * | 2012-05-28 | 2015-02-18 | 新日铁住金株式会社 | Method for charging raw material into bell-less blast furnace |
| CN105593380A (en) * | 2013-09-26 | 2016-05-18 | 杰富意钢铁株式会社 | Method and plant for removing arsenic and/or antimony from flue dusts |
| CN104789720B (en) * | 2015-04-14 | 2016-08-24 | 山西太钢不锈钢股份有限公司 | A kind of distributing method of blast furnace pelletizing |
| CN107406896A (en) * | 2015-03-30 | 2017-11-28 | 杰富意钢铁株式会社 | The method of charging feedstock into blast furnace |
| CN107475470A (en) * | 2017-08-16 | 2017-12-15 | 唐山钢铁集团有限责任公司 | A kind of blast furnace uses the damping down method of pelletizing at high proportion under furnace retaining state |
| CN108085441A (en) * | 2018-02-05 | 2018-05-29 | 山东钢铁股份有限公司 | A kind of material loading method processed of blast furnace feeding material |
| CN108265143A (en) * | 2018-03-30 | 2018-07-10 | 武汉钢铁有限公司 | A kind of loading method for preventing blast-furnace shaft knot thickness |
| CN109146233A (en) * | 2018-06-29 | 2019-01-04 | 首钢京唐钢铁联合有限责任公司 | Self-learning material distribution method and device for bell-less furnace top ore |
| CN109355448A (en) * | 2018-11-13 | 2019-02-19 | 包头钢铁（集团）有限责任公司 | A kind of smelting process of large blast furnace with addition of the fluorine-containing fluxed pellets of the low high magnesium of silicon at high proportion |
| CN111286567A (en) * | 2020-03-03 | 2020-06-16 | 首钢京唐钢铁联合有限责任公司 | Control method and system for improving pellet ratio in blast furnace smelting |
| CN111363871A (en) * | 2020-03-04 | 2020-07-03 | 首钢京唐钢铁联合有限责任公司 | Coal gas control method in blast furnace smelting |
| CN112575132A (en) * | 2020-11-16 | 2021-03-30 | 武汉钢铁有限公司 | Blast furnace smelting method for high-proportion pellet ore |
| CN113265496A (en) * | 2021-02-07 | 2021-08-17 | 首钢集团有限公司 | Blast furnace iron-making method using full-acid pellets as raw materials |
| CN113564291A (en) * | 2021-07-16 | 2021-10-29 | 鞍钢股份有限公司 | Material distribution method for high-proportion pellet coke extraction |
| CN114015824A (en) * | 2021-10-29 | 2022-02-08 | 包头钢铁（集团）有限责任公司 | Blast furnace smelting control process for increasing pellet ore proportion |
| CN114292974A (en) * | 2021-12-21 | 2022-04-08 | 包头钢铁（集团）有限责任公司 | Method for reducing blast furnace fuel ratio under tamping coke smelting condition |
| CN114729406A (en) * | 2019-11-29 | 2022-07-08 | 杰富意钢铁株式会社 | Method for operating a blast furnace and associated installation |
| CN114846159A (en) * | 2020-01-23 | 2022-08-02 | 杰富意钢铁株式会社 | Method for operating a blast furnace and associated installation |
| CN114959258A (en) * | 2022-05-30 | 2022-08-30 | 广东韶钢松山股份有限公司 | Smelting method of blast furnace high-proportion pellet ore |
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| CN104364397B (en) * | 2012-05-28 | 2016-08-17 | 新日铁住金株式会社 | The raw material charging method of bell-less blast furnace |
| CN102912049B (en) * | 2012-10-29 | 2014-11-26 | 首钢京唐钢铁联合有限责任公司 | Method for eliminating central coke feeding of blast furnace |
| CN102912049A (en) * | 2012-10-29 | 2013-02-06 | 首钢京唐钢铁联合有限责任公司 | Method for eliminating central coke feeding of blast furnace |
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| CN107406896B (en) * | 2015-03-30 | 2019-06-28 | 杰富意钢铁株式会社 | The method of charging feedstock into blast furnace |
| CN107406896A (en) * | 2015-03-30 | 2017-11-28 | 杰富意钢铁株式会社 | The method of charging feedstock into blast furnace |
| CN104789720B (en) * | 2015-04-14 | 2016-08-24 | 山西太钢不锈钢股份有限公司 | A kind of distributing method of blast furnace pelletizing |
| CN107475470A (en) * | 2017-08-16 | 2017-12-15 | 唐山钢铁集团有限责任公司 | A kind of blast furnace uses the damping down method of pelletizing at high proportion under furnace retaining state |
| CN108085441A (en) * | 2018-02-05 | 2018-05-29 | 山东钢铁股份有限公司 | A kind of material loading method processed of blast furnace feeding material |
| CN108265143A (en) * | 2018-03-30 | 2018-07-10 | 武汉钢铁有限公司 | A kind of loading method for preventing blast-furnace shaft knot thickness |
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| CN113265496A (en) * | 2021-02-07 | 2021-08-17 | 首钢集团有限公司 | Blast furnace iron-making method using full-acid pellets as raw materials |
| CN113564291B (en) * | 2021-07-16 | 2022-08-16 | 鞍钢股份有限公司 | Material distribution method for high-proportion pellet coke extraction |
| CN113564291A (en) * | 2021-07-16 | 2021-10-29 | 鞍钢股份有限公司 | Material distribution method for high-proportion pellet coke extraction |
| CN114015824A (en) * | 2021-10-29 | 2022-02-08 | 包头钢铁（集团）有限责任公司 | Blast furnace smelting control process for increasing pellet ore proportion |
| CN114015824B (en) * | 2021-10-29 | 2022-12-27 | 包头钢铁（集团）有限责任公司 | Blast furnace smelting control process for increasing pellet ore proportion |
| CN114292974A (en) * | 2021-12-21 | 2022-04-08 | 包头钢铁（集团）有限责任公司 | Method for reducing blast furnace fuel ratio under tamping coke smelting condition |
| CN114292974B (en) * | 2021-12-21 | 2022-11-22 | 包头钢铁（集团）有限责任公司 | Method for reducing blast furnace fuel ratio under tamping coke smelting condition |
| CN114959258A (en) * | 2022-05-30 | 2022-08-30 | 广东韶钢松山股份有限公司 | Smelting method of blast furnace high-proportion pellet ore |
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Application publication date: 20110413 |