CN102021255A - Distribution method of bell-free blast furnace with high proportion pellet ore burden structure - Google Patents
Distribution method of bell-free blast furnace with high proportion pellet ore burden structure Download PDFInfo
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- CN102021255A CN102021255A CN2010105779926A CN201010577992A CN102021255A CN 102021255 A CN102021255 A CN 102021255A CN 2010105779926 A CN2010105779926 A CN 2010105779926A CN 201010577992 A CN201010577992 A CN 201010577992A CN 102021255 A CN102021255 A CN 102021255A
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Abstract
The invention discloses a distribution method of a bell-free blast furnace with a high proportion pellet ore burden structure, particularly comprising the following steps: performing central coke charging with 7 to 15% of the coke/charge weight, and weighting 3 to 8% of the coke/charge weight corresponding to the ore amount through a coke weighting hopper under the tank; opening the coke gate and the ore gate simultaneously to uniformly mix the ore and the coke and load the mixture into the skip car, and charging according to the normal charging procedure; discharging the mixture of the ore and the coke into the furnace through a furnace roof launder when the lower throttle valve of the furnace roof charging bucket is opened, wherein the coke dropping point radius is larger than the ore dropping point radius after the distribution, and a uniform and stable coke layer is formed at the border of the ore charge layer; and controlling the ore/charge weight above the critical value, and controlling the average depth of the ore at the furnace throat within the range of 8 to 10% of the furnace throat diameter. By using the method disclosed by the invention, the resistance of the coal gas passing through the center and the border of the blast furnace in vertical direction can be reduced, thereby improving the gas permeability of the blast furnace burden column, reducing the pressure difference of the blast furnace, and ensuring the stable operation of the blast furnace.
Description
Technical field
The invention belongs to the blast furnace smelting process method, particularly a kind of bell-less blast furnace is pellet burden structure distributing process at high proportion.
Background technology
Demand because 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, be necessary to develop pellet production, blast furnace feeding pellet ratio is reached about 80%.But because the singularity that pellet itself is had increases to after 60% at the pellet consumption, smooth operation of furnace 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 bell-less blast furnace pellet burden structure smelting at high proportion, at present domestic reaching still do not have solution preferably in the world.Reason is: when the pellet ratio accounts for furnace charge total amount 60% when above, there is following problem in no bell roof material distributing: (1) 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; (2) 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; (3) 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 purpose of this invention is to provide a kind of bell-less blast furnace pellet burden structure distributing process at high proportion, can 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 that blast furnace stable smooth operation and technico-economical comparison improve, reduce pig iron cost, prolong blast furnace campaign.
Solution of the present invention is: a kind of bell-less blast furnace is pellet burden structure distributing process at high proportion, this method is by improving the ventilation property of blast furnace stock column vertical direction center and peripheral, form the twice air-flow, under the condition that guarantees smooth operation of furnace, improve gas utilization rate;
Concrete steps are:
7%-15% by coke (per) charge weight carries out central coke, the centre of development air-flow; Utilize the elder generation of coke scale hooper under the groove corresponding ore amount coke of weighing to criticize heavy 3%-8%; 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 can form uniform and stable coke layer at ore bed of material edge greater than ore drop point radius of a circle behind the cloth;
The ore deposit is criticized and heavily is controlled at more than the threshold value, and ore is the 8%-10% of throat diameter at the mean thickness of furnace throat.
The inventive method is simple, adopts the inventive method, and obtained metallurgical effect when the pellet ratio reaches 80% sees the following form.
By data in the above-mentioned table as can be known, use Technology of the present invention to adjust to the right place after, can improve capacity factor of a blast furnace 8%-10%; Reduce blast furnace fuel and compare 2-3%; The pig iron contains [si] and descends 0.08%, and 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.Therefore, the inventive method can reduce the resistance by blast furnace stock column vertical direction center and peripheral coal gas, improves the blast furnace permeability of stock column, reduces blast furnace pressure reduction, guarantees that blast furnace stable smooth operation and technico-economical comparison improve, and reduces pig iron cost, prolongs blast furnace campaign.
Embodiment
A kind of bell-less blast furnace is pellet burden structure distributing process at high proportion, by improving the ventilation property of blast furnace stock column vertical direction center and peripheral, forms the twice air-flow, under the condition that guarantees smooth operation of furnace, improves gas utilization rate.
(1) 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;
(2) 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 3%-8%; 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;
(3) 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;
(4) loading method adopts positive packing, ore deposit Jiao not to wait stockline;
(5) 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, be no less than 4 to 5 tank switching loop cycles a stock column inner control and get final product;
(6) ore deposit is criticized and heavily is controlled at more than the threshold value, and ore is the 8%-10% of throat diameter at the mean thickness of furnace throat.
Claims (4)
1. bell-less blast furnace pellet burden structure distributing process at high proportion, it is characterized in that: this method forms the twice air-flow by improving the ventilation property of blast furnace stock column vertical direction center and peripheral, under the condition that guarantees smooth operation of furnace, improves gas utilization rate;
Concrete steps are:
7%-15% by coke (per) charge weight carries out central coke, the centre of development air-flow; Utilize the elder generation of coke scale hooper under the groove corresponding ore amount coke of weighing to criticize heavy 3%-8%; 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 can form uniform and stable coke layer at ore bed of material edge greater than ore drop point radius of a circle behind the cloth;
The ore deposit is criticized and heavily is controlled at more than the threshold value, and ore is the 8%-10% of throat diameter at the mean thickness of furnace throat.
2. bell-less blast furnace according to claim 1 is pellet burden structure distributing process at high proportion, it is characterized in that: 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.
3. bell-less blast furnace according to claim 1 is pellet burden structure distributing process at high proportion, it is characterized in that: charging process adopts positive packing, ore deposit Jiao not to wait stockline.
4. bell-less blast furnace according to claim 1 is pellet burden structure distributing process at high proportion, it is characterized in that: and 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, be no less than 4 to 5 tank switching loop cycles a stock column inner control and get final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105779926A CN102021255A (en) | 2009-12-31 | 2010-11-28 | Distribution method of bell-free blast furnace with high proportion pellet ore burden structure |
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| CN200910113629 | 2009-12-31 | ||
| CN200910113629.6 | 2009-12-31 | ||
| CN2010105779926A CN102021255A (en) | 2009-12-31 | 2010-11-28 | Distribution method of bell-free blast furnace with high proportion pellet ore burden structure |
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| CN102021255A true CN102021255A (en) | 2011-04-20 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104302788A (en) * | 2012-05-18 | 2015-01-21 | 杰富意钢铁株式会社 | Method for loading raw material into blast furnace |
| CN107119163A (en) * | 2017-06-08 | 2017-09-01 | 唐山钢铁集团有限责任公司 | A kind of Burden distribution method of blast furnace of pelletizing at high proportion |
| CN109146233A (en) * | 2018-06-29 | 2019-01-04 | 首钢京唐钢铁联合有限责任公司 | A kind of method and device of bell-less furnace top ore self study cloth |
| CN109242345A (en) * | 2018-10-10 | 2019-01-18 | 鞍钢股份有限公司 | A kind of determination method of charge weight during blast furnace material distribution |
| 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 |
| CN113832269A (en) * | 2021-09-22 | 2021-12-24 | 西安建筑科技大学 | Central coke feeding method for reducing coke ratio of blast furnace |
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| CN87106397A (en) * | 1987-09-22 | 1988-04-27 | 鞍山钢铁学院 | Distributing process of high mixture ratio pellet for bell type-blast furnace |
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2010
- 2010-11-28 CN CN2010105779926A patent/CN102021255A/en active Pending
Patent Citations (1)
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| CN87106397A (en) * | 1987-09-22 | 1988-04-27 | 鞍山钢铁学院 | Distributing process of high mixture ratio pellet for bell type-blast furnace |
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| 《新疆钢铁》 20081231 李维浩等 八钢380m�高炉多环布料探索试验及生产实践 第28-30页 1-2、4 , 第1期 * |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104302788A (en) * | 2012-05-18 | 2015-01-21 | 杰富意钢铁株式会社 | Method for loading raw material into blast furnace |
| CN104302788B (en) * | 2012-05-18 | 2016-05-04 | 杰富意钢铁株式会社 | To the method for blast furnace charging feedstock |
| CN107119163A (en) * | 2017-06-08 | 2017-09-01 | 唐山钢铁集团有限责任公司 | A kind of Burden distribution method of blast furnace of pelletizing at high proportion |
| CN109146233A (en) * | 2018-06-29 | 2019-01-04 | 首钢京唐钢铁联合有限责任公司 | A kind of method and device of bell-less furnace top ore self study cloth |
| CN109242345A (en) * | 2018-10-10 | 2019-01-18 | 鞍钢股份有限公司 | A kind of determination method of charge weight during blast furnace material distribution |
| 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 |
| 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 |
| CN113832269A (en) * | 2021-09-22 | 2021-12-24 | 西安建筑科技大学 | Central coke feeding method for reducing coke ratio of blast furnace |
| CN113832269B (en) * | 2021-09-22 | 2023-01-31 | 西安建筑科技大学 | Central coke feeding method for reducing coke ratio of blast furnace |
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Application publication date: 20110420 |