CN102839244A - Device and method for hot loading of metallized pellets of rotary hearth furnace into blast furnace - Google Patents
Device and method for hot loading of metallized pellets of rotary hearth furnace into blast furnace Download PDFInfo
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- CN102839244A CN102839244A CN2012103280096A CN201210328009A CN102839244A CN 102839244 A CN102839244 A CN 102839244A CN 2012103280096 A CN2012103280096 A CN 2012103280096A CN 201210328009 A CN201210328009 A CN 201210328009A CN 102839244 A CN102839244 A CN 102839244A
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Abstract
The invention discloses a device and a method for hot loading of metallized pellets of a rotary hearth furnace into a blast furnace. The device comprises the rotary hearth furnace, the blast furnace, an intermediate bin, a belt scale and a feeding belt system. The method comprises the following steps of: delivering high-temperature (between 900 and 1,100 DEG C) metallized pellets produced from the rotary hearth furnace to the intermediate bin through a high temperature-resistant chain plate for preserving heat and storing; controlling the feeding velocity according to the proportion of furnace burdens for the production of the blast furnace, and metering materials through the belt scale when a feeding belt on the blast furnace feeds the materials; distributing sintering ore on the feeding belt; distributing the high-temperature metallized pellets when the sintering ore on the feeding belt is delivered to the intermediate bin; and distributing lump ore and oxidized pellets sequentially when delivering the high-temperature metallized pellets to a lump ore bin and an oxidized pellet bin. According to the device and the method, the furnace burdens on the belt are distributed on the feeding belt layer by layer according to the sequence of sintering, and distributing the high-temperature metallized pellets, the lump ore and the pellets, so that the waste heat of the high-temperature metallized pellets is fully used; and the low-temperature sintering ore is used as a grate-layer material, so that the service life of the feeding belt is prolonged.
Description
Technical field
The invention belongs to metallurgical industry ironmaking field, relate to the device and method that a kind of rotary hearth furnace metallized pellet hot charging is gone into blast furnace.
Background technology
Iron and steel enterprise is the energy consumption rich and influential family, is again heavy polluter.Iron and Steel Enterprises in China ton steel comprehensive energy consumption exceeds much than international most advanced level, so iron and steel enterprise is energy-saving and cost-reducing that enterprise self, environment protection and national economy are all had very important meaning.
Blast furnace slag iron etc. since self temperature than higher, heat content is abundant, is a kind of good secondary resource to energy industry.Because of production distribution and traffic requirements, need cooling after blast furnace main raw material sintering and pellet formation are come out simultaneously, and carry storage, material temperature must drop to lower level, causes China's present stage blast furnace feeding raw material mostly to be normal temperature.Utilize the existing sensible heat of Iron And Steel Plant that raw material is heated, not only can reduce the waste of the iron and steel flow process energy, and blast furnace production economic target is had the improvement effect.Patent CN101696460A discloses a kind of dual continuous steel making with iron-containing material rotary hearth furnace process method; This method joins smelting furnace to the hot metal pellet through spiral conveyer; Because being more suitable for powder, carries spiral conveyer; And metallized pellet is the metallized pellet with certain degree of hardness, is prone to cause the phenomenon that gets stuck in the course of conveying like this, and equipment loss is big.And course of conveying influences the accurate control of production process mass flow not to the inventory real time measure.
The north is long owing to winter time, and feed stock for blast furnace is in low temperature for a long time, has increased the blast furnace fuel consumption, and makes blast furnace gas temperature low excessively sometimes, and then causes the bag-type dust bonding, influences the blast furnace ordinary production.Therefore, be necessary to make full use of sensible heat, make the blast furnace feeding material temperature can be stabilized in certain level; It is low excessively to be unlikely to gas temperature, causes bag-type dust to stop up, and charge-temperature raises simultaneously; Gas temperature is raise, increased TRT (blast-furnace top gas recovery turbine generator) generated energy.
Summary of the invention
For making full use of rotary hearth furnace metallized pellet sensible heat, the present invention provides a kind of rotary hearth furnace metallized pellet hot charging to go into the apparatus and method of blast furnace.
In order to utilize rotary hearth furnace metallized pellet sensible heat, scheme of the present invention is following: agglomerate ore storage bin after belt scale metering cloth on charging belt; The hot metal pellet that rotary hearth furnace is produced is delivered to intermediate bin insulation through high temperature resistant carrier bar and stores, after the belt scale metering above the agglomerate of cloth on charging belt; Lump ore is metered into charging belt at ore storage bin through belt scale, drops on material loading and goes in the belt above the metallized pellet; The oxidisability pelletizing adds charging belt at ore storage bin through the belt scale metering at last.Require respectively to go into furnace charge per-cent according to blast furnace, the control blanking velocity, and open the sintering silo blanking earlier; Mineral aggregate to be sintered is behind the intermediate bin that is transported to the hot metal pellet on the belt; Open the intermediate bin blanking, when furnace charge moves to lump ore and oxidisability pelletizing successively on the belt, the blanking of control feed opening.Furnace charge is pressed sintering, hot metal pellet, lump ore and pelletizing order stratiform cloth at charging belt, has both made full use of hot metal pellet waste heat, has used the low-temperature sintering ore deposit again and has done grate-layer material, has prolonged the charging belt life-span.
Agglomerate temperature described herein is 20 ℃-70 ℃, and lump ore is normal temperature (identical with envrionment temperature), and the acid pellet temperature is 20 ℃-70 ℃.Said lump ore is a massive iron ore; Agglomerate is with various powdery iron-containing raw materials, allocates an amount of fuel and flux into, adds an amount of water; Through mix and make ball after on agglomerating plant, make material that a series of physicochemical change take place, the ore that the mineral powder granular sintering is formed.
Described hot metal pellet tapping temperature is 900-1100 ℃, and the iron in the pelletizing mainly exists with the metallic iron form, the degree of metalization of pelletizing >=60%, and the temperature that gets into intermediate bin is 500～700 ℃.
Said carrier bar has high-temperature stability, heatproof >=1100 ℃, and those skilled in the art can select as required flexibly.Through naturally cooling, temperature drops to 500～700 ℃ to the metallized pellet that rotary hearth furnace comes out during to intermediate bin on carrier bar.
Described intermediate bin liner is heat-stable lagging material, the common practise that is chosen as those skilled in the art that it is concrete.
Said agglomerate temperature is 20 ℃-70 ℃, and lump ore is a normal temperature, and the acid pellet temperature is 20 ℃-70 ℃.
Said agglomerate, metallized pellet, lump ore and acid pellet have following part by weight: agglomerate 55-80%, lump ore 5-10%, acid pellet 10-20%, metallized pellet 5-15%; Said order is for referring to behind the good agglomerate of material loading skin elder generation's cloth, belt be transported to intermediate bin again the cloth metallized pellet in the above, so cloth lump ore and acid pellet successively form a structure as shown in Figure 2.
Said charging belt is high temperature resistant belt, 350 ℃ of heatproof degree, and those skilled in the art can select as required flexibly.Before furnace charge got into blast furnace, charge-temperature was 80-150 ℃.
The present invention also provides a kind of device that rotary hearth furnace metallized pellet hot charging is gone into blast furnace that is used for for this reason; It comprises rotary hearth furnace, blast furnace, intermediate bin, belt scale and charging belt system; Rotary hearth furnace links to each other with intermediate bin through carrier bar; Intermediate bin and belt scale necklace, belt scale links to each other with the charging belt system, and the charging belt system links to each other with blast furnace; Also have agglomerate storehouse, lump ore storehouse, acid pellet storehouse to be respectively applied for the sample introduction of corresponding material in this external system, it has following putting in order with intermediate bin by charging belt sample introduction direction: agglomerate storehouse, intermediate bin, lump ore storehouse, acid pellet storehouse.Existing stating before its corresponding techniques characteristic.
The present invention is the method that a kind of rotary hearth furnace metallized pellet hot charging is gone into blast furnace; This method is not made very cataclysm to charging of blast furnace technology; Effectively utilized the sensible heat of the hot metal pellet that rotary hearth furnace produces; And omitted this link of cooling of rotary hearth furnace pelletizing, saved the rotary hearth furnace production energy consumption.It is long to have solved the northern time in winter simultaneously, and blast furnace feeding charge-temperature deficiency causes gas temperature low excessively, and the cloth bag bonding influences the problem of blast furnace ordinary production, favourable reduction blast furnace ironmaking comprehensive energy consumption.
Description of drawings
Fig. 1 is the device synoptic diagram that a kind of rotary hearth furnace metallized pellet hot charging is gone into blast furnace.
Fig. 2 is the bed of material sectional view behind the charging belt cloth.
Embodiment
Embodiment 1:
1880m
3Blast furnace, burden structure are agglomerate 70%, lump ore 5%, metallized pellet 10%, acid pellet 15%.
As shown in Figure 1; This device comprises rotary hearth furnace, blast furnace, intermediate bin, belt scale and charging belt system, and rotary hearth furnace links to each other with intermediate bin through carrier bar, and intermediate bin links to each other with belt scale; Belt scale links to each other with the charging belt system, and the charging belt system links to each other with blast furnace.
The hot metal pellet that rotary hearth furnace reduction comes out, 1050 ℃ of temperature are transported to intermediate bin through carrier bar, because naturally cooling, squeezing into the preceding temperature of intermediate bin is 600 ℃.Blast furnace feeding material batching is pressed sintering 70%, and metallized pellet 10%, lump ore 6%, acid pellet 14% carry out proportioning, and wherein the agglomerate temperature is 60 ℃, and the lump ore temperature is a room temperature, 55 ℃ of acid pellet temperature.According to the good dnockout flow of Charge Mixture Control and through the weighing belt metering; By stratiform on charging belt, arrange successively agglomerate, metallized pellet, lump ore and acid pellet furnace charge; Form a structure shown in Figure 2, be transported to State of Blast Furnace liftout jar through charging belt and get into blast furnace.Because the heat transfer of hot metal pellet makes to mix and expects that temperature had reached 125 ℃ when State of Blast Furnace was pushed up, the temperature that has guaranteed blast furnace gas is in higher level.
Embodiment 2:
Similar with the device of embodiment 1; This device comprises rotary hearth furnace, blast furnace, intermediate bin, belt scale and charging belt system; Rotary hearth furnace links to each other with intermediate bin through carrier bar; Intermediate bin links to each other with belt scale, and belt scale links to each other with the charging belt system, and the charging belt system links to each other with blast furnace.
3200m
3Blast furnace, burden structure are agglomerate 68%, lump ore 5%, metallized pellet 12%, acid pellet 15%.
The hot metal pellet that rotary hearth furnace reduction comes out, 1100 ℃ of temperature are transported to intermediate bin through carrier bar, because naturally cooling, squeezing into the preceding temperature of intermediate bin is 660 ℃.Blast furnace feeding material batching is pressed sintering 65%, and metallized pellet 15%, lump ore 5%, acid pellet 15% carry out proportioning, because winter, charge-temperature is lower, and the agglomerate temperature is 40 ℃, and the lump ore temperature is a room temperature, 35 ℃ of acid pellet temperature.According to the good dnockout flow of Charge Mixture Control and through the weighing belt metering; By stratiform on charging belt, arrange successively agglomerate, metallized pellet, lump ore and acid pellet furnace charge; Form a structure shown in Figure 2, be transported to State of Blast Furnace liftout jar through charging belt and get into blast furnace.Because the heat transfer of hot metal pellet makes to mix and expects that temperature had reached 90 ℃ when State of Blast Furnace was pushed up, the temperature that has guaranteed blast furnace gas is in higher level.
Embodiment 3:
3200m
3Blast furnace, burden structure are agglomerate 55%, lump ore 10%, metallized pellet 15%, and acid pellet 20%, institute's using appts is identical with embodiment 2.
The hot metal pellet that rotary hearth furnace reduction comes out, 1100 ℃ of temperature are transported to intermediate bin through carrier bar, because naturally cooling, squeezing into the preceding temperature of intermediate bin is 660 ℃.Blast furnace feeding material batching is pressed sintering 55%, and metallized pellet 15%, lump ore 10%, acid pellet 20% carry out proportioning, because winter, charge-temperature is lower, and the agglomerate temperature is 20 ℃, and the lump ore temperature is a room temperature, 20 ℃ of acid pellet temperature.According to the good dnockout flow of Charge Mixture Control and through weighing belt metering,, be transported to State of Blast Furnace liftout jar through charging belt and get into blast furnace by stratiform on charging belt, arrange successively agglomerate, metallized pellet, lump ore and acid pellet furnace charge.Because the heat transfer of hot metal pellet makes to mix and expects that temperature had reached 90 ℃ when State of Blast Furnace was pushed up, the temperature that has guaranteed blast furnace gas is in higher level.
Embodiment 4:
3200m3 blast furnace, burden structure are agglomerate 80%, lump ore 5%, metallized pellet 5%, and acid pellet 10%, institute's using appts is identical with embodiment 2.
The hot metal pellet that rotary hearth furnace reduction comes out, 1100 ℃ of temperature are transported to intermediate bin through carrier bar, because naturally cooling, squeezing into the preceding temperature of intermediate bin is 660 ℃.Blast furnace feeding material batching is pressed sintering 80%, and metallized pellet 5%, lump ore 5%, acid pellet 10% carry out proportioning, and the agglomerate temperature is 70 ℃, and the lump ore temperature is a room temperature, 70 ℃ of acid pellet temperature.According to the good dnockout flow of Charge Mixture Control and through weighing belt metering,, be transported to State of Blast Furnace liftout jar through charging belt and get into blast furnace by stratiform on charging belt, arrange successively agglomerate, metallized pellet, lump ore and acid pellet furnace charge.Because the heat transfer of hot metal pellet makes to mix and expects that temperature had reached 150 ℃ when State of Blast Furnace was pushed up, the temperature that has guaranteed blast furnace gas is in higher level.
Embodiment 5:
3200m3 blast furnace, burden structure are agglomerate 77%, lump ore 8%, metallized pellet 5%, and acid pellet 10%, institute's using appts is identical with embodiment 2.
The hot metal pellet that rotary hearth furnace reduction comes out, 1100 ℃ of temperature are transported to intermediate bin through carrier bar, because naturally cooling, squeezing into the preceding temperature of intermediate bin is 660 ℃.Blast furnace feeding material batching is pressed sintering 77%, and metallized pellet 5%, lump ore 8%, acid pellet 10% carry out proportioning, and the agglomerate temperature is 60 ℃, and the lump ore temperature is a room temperature, 55 ℃ of acid pellet temperature.According to the good dnockout flow of Charge Mixture Control and through weighing belt metering,, be transported to State of Blast Furnace liftout jar through charging belt and get into blast furnace by stratiform on charging belt, arrange successively agglomerate, metallized pellet, lump ore and acid pellet furnace charge.Because the heat transfer of hot metal pellet makes to mix and expects that temperature had reached 80 ℃ when State of Blast Furnace was pushed up, the temperature that has guaranteed blast furnace gas is in higher level.
Claims (8)
1. a rotary hearth furnace metallized pellet hot charging is gone into the device of blast furnace; It is characterized in that; Described device comprises rotary hearth furnace, blast furnace, intermediate bin, belt scale and charging belt system, and rotary hearth furnace links to each other with intermediate bin through carrier bar, and intermediate bin links to each other with belt scale; Belt scale links to each other with the charging belt system, and the charging belt system links to each other with blast furnace.
2. device according to claim 1 is characterized in that said rotary hearth furnace is a high temperature reaction stove, and the metallized pellet of producing is solid-state, and carries through carrier bar; Said carrier bar heatproof >=1100 ℃.
3. device according to claim 1 is characterized in that, said belt scale is used for transporting the blanking of agglomerate, metallized pellet and metering intermediate bin.
4. device according to claim 1 is characterized in that, described charging belt system is made up of charging belt, transmission mechanism and tightening device, and said charging belt is high temperature resistant belt, 350 ℃ of heatproofs.
5. one kind is utilized the arbitrary said device of claim 1-4 that rotary hearth furnace metallized pellet hot charging is gone into the method for blast furnace, it is characterized in that this method comprises:
1) the rotary hearth furnace reduction hot metal pellet insulation of coming out stores;
2) agglomerate, metallized pellet, lump ore and acid pellet are reached the sequencing storied placement in proportion, then the furnace charge that obtains is sent into blast furnace.
6. method according to claim 5 is characterized in that, said metallized pellet temperature is 900-1100 ℃, and the iron in the metallized pellet mainly exists with the metallic iron form, the degree of metalization of iron >=60%, and temperature is 500-700 ℃ during the insulation storage.
7. method according to claim 5 is characterized in that, said agglomerate temperature is 20 ℃-70 ℃, and lump ore is a normal temperature, and the acid pellet temperature is 20 ℃-70 ℃, and before furnace charge got into blast furnace, charge-temperature was 80-150 ℃.
8. method according to claim 5 is characterized in that, said agglomerate, metallized pellet, lump ore and acid pellet have following part by weight: agglomerate 55-80%, lump ore 5-10%, acid pellet 10-20%, metallized pellet 5-15%; After said order is the good agglomerate of first cloth, again the cloth metallized pellet in the above, cloth lump ore and acid pellet then.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210328009.6A CN102839244B (en) | 2012-09-06 | 2012-09-06 | Device and method for hot loading of metallized pellets of rotary hearth furnace into blast furnace |
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| CN201210328009.6A CN102839244B (en) | 2012-09-06 | 2012-09-06 | Device and method for hot loading of metallized pellets of rotary hearth furnace into blast furnace |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106440818A (en) * | 2016-11-01 | 2017-02-22 | 中冶焦耐(大连)工程技术有限公司 | Compact hot sintering mineral transferring system and process |
| CN110684876A (en) * | 2019-11-20 | 2020-01-14 | 山东钢铁股份有限公司 | Charging system and control method thereof |
| CN112522460A (en) * | 2020-11-18 | 2021-03-19 | 山东钢铁集团日照有限公司 | Method for adjusting airflow distribution by spreading blast furnace burden |
| CN113086497A (en) * | 2021-03-25 | 2021-07-09 | 首钢京唐钢铁联合有限责任公司 | Automatic blanking control method and device for pellet production line |
| CN115125359A (en) * | 2021-03-29 | 2022-09-30 | 宝山钢铁股份有限公司 | Method and system for hot charging and hot returning of metallized pellets of rotary hearth furnace to converter for steelmaking |
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| CN102071271A (en) * | 2009-11-24 | 2011-05-25 | 山东铁雄能源煤化有限公司 | Blast-furnace ironmaking raw material hot delivery and hot charging process and equipment |
| CN202144383U (en) * | 2011-07-22 | 2012-02-15 | 重庆钢铁(集团)有限责任公司 | Protection device for hot ore pellet chain scraper conveyor |
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Patent Citations (3)
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| CN102071271A (en) * | 2009-11-24 | 2011-05-25 | 山东铁雄能源煤化有限公司 | Blast-furnace ironmaking raw material hot delivery and hot charging process and equipment |
| CN201834956U (en) * | 2010-10-22 | 2011-05-18 | 上海梅山钢铁股份有限公司 | Secondary diving and adding device of iron ore powder-sintered solid |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106440818A (en) * | 2016-11-01 | 2017-02-22 | 中冶焦耐(大连)工程技术有限公司 | Compact hot sintering mineral transferring system and process |
| CN106440818B (en) * | 2016-11-01 | 2018-05-29 | 中冶焦耐(大连)工程技术有限公司 | A kind of compact heat sinter movement system and technique |
| CN110684876A (en) * | 2019-11-20 | 2020-01-14 | 山东钢铁股份有限公司 | Charging system and control method thereof |
| CN112522460A (en) * | 2020-11-18 | 2021-03-19 | 山东钢铁集团日照有限公司 | Method for adjusting airflow distribution by spreading blast furnace burden |
| CN112522460B (en) * | 2020-11-18 | 2022-05-17 | 山东钢铁集团日照有限公司 | Method for adjusting airflow distribution by spreading blast furnace burden |
| CN113086497A (en) * | 2021-03-25 | 2021-07-09 | 首钢京唐钢铁联合有限责任公司 | Automatic blanking control method and device for pellet production line |
| CN113086497B (en) * | 2021-03-25 | 2023-09-15 | 首钢京唐钢铁联合有限责任公司 | Automatic blanking control method and device for pellet production line |
| CN115125359A (en) * | 2021-03-29 | 2022-09-30 | 宝山钢铁股份有限公司 | Method and system for hot charging and hot returning of metallized pellets of rotary hearth furnace to converter for steelmaking |
| CN115125359B (en) * | 2021-03-29 | 2024-01-09 | 宝山钢铁股份有限公司 | Method and system for steelmaking by hot charging and hot feeding of metallized pellets of rotary hearth furnace |
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| CN102839244B (en) | 2014-09-03 |
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