CN104060008A - Blast furnace smelting method - Google Patents
Blast furnace smelting method Download PDFInfo
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- CN104060008A CN104060008A CN201310236293.9A CN201310236293A CN104060008A CN 104060008 A CN104060008 A CN 104060008A CN 201310236293 A CN201310236293 A CN 201310236293A CN 104060008 A CN104060008 A CN 104060008A
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- blast furnace
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Abstract
The invention discloses a blast furnace smelting method. The method comprises the steps: in a blast furnace smelting process, spraying a coal powder and a carrier gas into a blast furnace through an air port of the blast furnace, wherein the carrier gas is an oxygen-enriched gas with the oxygen content of more than 50 vol%. Under a condition of the same oxygen enrichment rate of the blast furnace, the method can allow the combustion rate of the blast furnace sprayed and blown coal powder in the blast furnace smelting process to be improved.
Description
Technical field
The present invention relates to a kind of method of blast-furnace smelting.
Background technology
In the process of blast-furnace smelting, the effect of utilizing of pulverized coal injection in blast furnace is that the rate of combustion in blast furnace determines by coal dust, and the rate of combustion of coal injection is higher, and coal dust substitution rate is just higher, reduces coke ratio just more, and coal dust utilizes effect just better.
In order to improve the rate of combustion of pulverized coal injection in blast furnace, the measures such as the method for prior art has the granularity that reduces coal injection, improves the oxygen enrichment percentage in blast furnace, the fugitive constituent of raising injection coal, wherein, the oxygen enrichment percentage improving in blast furnace is to improve the mode conventionally adopting in the current production practice of coal combustion rate.Rich-oxygen of blast furnace is exactly the oxygen enrichment percentage increasing in air blast, and general way is before blower fan or before hotblast stove, to add oxygen.Practice shows, this oxygen enrichment mode makes oxygen consuming amount very large, and oxygen concn in coal dust firing region is not high yet, is unfavorable for improving the rate of combustion of coal dust, causes coal dust to utilize effect not good enough.
Summary of the invention
The object of the invention is to overcome the not good defect of blast furnace injection rate of pulverized coal combustion in prior art, a kind of novel method of blast-furnace smelting is provided.
In order to achieve the above object, the invention provides a kind of method of blast-furnace smelting, the method comprises: in blast furnace ironmaking process, coal dust and carrier gas are sprayed in blast furnace by the air port of blast furnace, wherein, described carrier gas is the oxygen rich gas that oxygen content is greater than 50 volume %.
Method of the present invention can make the local oxygen enrichment in the combustion zone of coal dust before air port, increases considerably the oxygen level in coal dust firing region, thereby improves blast furnace injection rate of pulverized coal combustion.
Other features and advantages of the present invention are described in detail the embodiment part subsequently.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
A kind of method that the invention provides blast-furnace smelting, the method comprises: in blast furnace ironmaking process, coal dust and carrier gas are sprayed in blast furnace by the air port of blast furnace, wherein, described carrier gas is the oxygen rich gas that oxygen content is greater than 50 volume %.
The method according to this invention, only need make oxygen content in coal injection carrier gas used be greater than 50 volume %, can test object of the present invention,, improves blast furnace injection rate of pulverized coal combustion that is.Under preferable case, described carrier gas is oxygen.
The method according to this invention, the temperature and pressure of carrier gas can be adjusted according to the concrete condition of production.Under preferable case, the temperature of described carrier gas is 10-25 DEG C, and pressure is 0.8-1.2MPa.Further preferably, the temperature of described carrier gas is 15-20 DEG C, and pressure is 0.9-1.1MPa.In the present invention, pressure refers to absolute pressure.
The method according to this invention, the method is carried out air blast oxygen enrichment to blast furnace before can also being included in coal dust and carrier gas being sprayed into blast furnace by the air port of blast furnace.That is to say, method of the present invention can be arranged in pairs or groups and use mutually with the method for conventional raising coal injection rate of combustion, and can obtain better effect.Wherein, air blast oxygen enrichment refers to before coal injection, and blast furnace is carried out to air blast (simultaneously increasing the oxygen content in air blast), replaces the air of high furnace interior, and high furnace interior oxygen content is improved.
In the present invention, the oxygen enrichment percentage in blast furnace refers to total oxygen enrichment percentage in blast furnace, comprises and sprays into the part that carrier gas improves oxygen level, also comprises the part that air blast oxygen enrichment (if having this step) improves oxygen level.Oxygen enrichment percentage in blast furnace can be adjusted according to practical condition.Under preferable case, it is 2-5 volume % that the straying quatity of described carrier gas and air blast oxygen enrichment make the oxygen enrichment percentage in blast furnace.
The method according to this invention, described coal dust can be the blast furnace coal injection of this area routine.Under preferable case, described coal dust is one or more in hard coal, lean coal and bituminous coal.
The method according to this invention, the particle diameter of described coal dust can be selected according to practical condition.Under preferable case, the particle diameter of described coal dust is 0.05-0.1mm.
In the present invention, there is no special requirement for blast-furnace smelting raw material used.Under preferable case, described raw material is vanadium titano-magnetite raw material.Further preferably, described vanadium titano-magnetite raw material contains vanadium titanium agglomerate, vanadium-titanium pellet and lump ore, the described vanadium titanium agglomerate agglomerate that the mixture sintering that contains sefstromite concentrate and common iron ore concentrate obtains of serving as reasons, described vanadium-titanium pellet is the pellet being obtained by sefstromite concentrate roasting or the pellet being obtained by the mixture roasting that contains sefstromite concentrate and common iron ore concentrate, described common iron ore concentrate is that described lump ore is common rhombohedral iron ore lump ore not containing the iron ore concentrate of v element and titanium elements.In the present invention, described common iron ore concentrate refers to not containing vanadium and titanium elements or only contains micro-vanadium, the iron ore concentrate of titanium elements; Described common rhombohedral iron ore lump ore refers to the rhombohedral iron ore lump ore that does not contain vanadium and titanium elements or only contain micro-vanadium, titanium elements.
In described method of the present invention, the condition of described blast-furnace smelting does not have strict requirement, can in conventional blast furnace smelting method, suitably select.Under preferable case, the condition of described smelting comprises: the draught temperature of blast furnace is 1200-1250 DEG C, and furnace top pressure is 120-200kPa.
Below in conjunction with embodiment, the invention will be further described, but scope of the present invention is not limited in following examples.
Vanadium titanium agglomerate (TFe49-51%, FeO7-8%, TiO in following examples and comparative example
26-8%) come from and climb steel iron work;
Common rhombohedral iron ore lump ore (TFe45-50%, FeO2-5%, SiO
218-20%) come from Huili County;
Vanadium-titanium pellet (TFe53-55%, FeO1-2%, TiO
28-10%) come from Flos Bombacis Malabarici steel city enterprise-like corporation;
Coke (C80-82%, A12.5-13.5%, CSR58-60%) comes from Pan Gang coke-oven plant;
Hard coal, lean coal come from Panzhihua City mineral bureau.
The rate of combustion of coal dust refers to the mark of coal dust firing quality, is the speed speed that coal dust burns under certain temperature and atmosphere.
The testing method of the rate of combustion of coal dust is the WCT-2C microcomputer differential thermal balance of utilizing Beijing Optical Instrument Factory to produce, by weighed a certain amount of coal dust, add in sample crucible, be positioned in differential thermal balance, pass into a certain amount of airflow (60ml/min), according to certain temperature rise rate (20 DEG C/min) heating coal dust, read coal dust firing to 500 DEG C, 600 DEG C, 700 DEG C and lose weight percent, respectively divided by all can combustion value (be coal dust perfect combustion after all percent weight loss) be rate of combustion.
Embodiment 1
The present embodiment is for illustrating the method for blast-furnace smelting provided by the invention.
The common rhombohedral iron ore lump ore of the vanadium titanium agglomerate of 70 weight parts, 8 weight parts, vanadium-titanium pellet and the coke of 22 weight parts are added to 1200m
3blast furnace in smelt; Blast furnace is carried out to air blast oxygen enrichment; The coal dust (60 % by weight hard coal+40 % by weight lean coal) and the carrier gas (temperature is 20 DEG C, and pressure is 1MPa, and carrier gas is oxygen) that particle diameter are about to 74 microns spray in blast furnace by the air port of blast furnace; Wherein, to make the oxygen enrichment percentage of blast furnace be 4 volume % for the straying quatity of described carrier gas and air blast oxygen enrichment.
Winding-up is about 120kg/ ton iron to the winding-up amount of the described coal dust in blast furnace, and the add-on control of coke is about to 460kg/ ton iron, and it is 1220 DEG C that the hot blast temperature in the air port of blast furnace (being also wind-warm syndrome) is controlled, and is 157kPa by top pressure control.
In above-mentioned smelting process, coal dust rate of combustion of combustion zone in blast furnace is as shown in table 1 below.
Embodiment 2
The present embodiment is for illustrating the method for blast-furnace smelting provided by the invention.
The common rhombohedral iron ore lump ore of the vanadium titanium agglomerate of 70 weight parts, 8 weight parts, vanadium-titanium pellet and the coke of 22 weight parts are added to 1200m
3blast furnace in smelt; Blast furnace is carried out to air blast oxygen enrichment; The coal dust (60 % by weight hard coal+40 % by weight lean coal) and the carrier gas (temperature is 15 DEG C, and pressure is 0.9MPa, and carrier gas is oxygen) that particle diameter are about to 50 microns spray in blast furnace by the air port of blast furnace; Wherein, to make the oxygen enrichment percentage of blast furnace be 5 volume % for the straying quatity of described carrier gas and air blast oxygen enrichment.
Winding-up is about 120kg/ ton iron to the winding-up amount of the described coal dust in blast furnace, and the add-on control of coke is about to 460kg/ ton iron, and it is 1250 DEG C that the hot blast temperature in the air port of blast furnace (being also wind-warm syndrome) is controlled, and is 120kPa by top pressure control.
In above-mentioned smelting process, coal dust rate of combustion of combustion zone in blast furnace is as shown in table 1 below.
Embodiment 3
The present embodiment is for illustrating the method for blast-furnace smelting provided by the invention.
The common rhombohedral iron ore lump ore of the vanadium titanium agglomerate of 70 weight parts, 8 weight parts, vanadium-titanium pellet and the coke of 22 weight parts are added to 1200m
3blast furnace in smelt; Blast furnace is carried out to air blast oxygen enrichment; The coal dust (60 % by weight hard coal+40 % by weight lean coal) and the carrier gas (temperature is 25 DEG C, and pressure is 1.2MPa, and carrier gas is the oxygen rich gas of oxygen content 80 volume %) that particle diameter are about to 100 microns spray in blast furnace by the air port of blast furnace; Wherein, to make the oxygen enrichment percentage of blast furnace be 2 volume % for the straying quatity of described carrier gas and air blast oxygen enrichment.
Winding-up is about 120kg/ ton iron to the winding-up amount of the described coal dust in blast furnace, and the add-on control of coke is about to 460kg/ ton iron, and it is 1200 DEG C that the hot blast temperature in the air port of blast furnace (being also wind-warm syndrome) is controlled, and is 200kPa by top pressure control.
In above-mentioned smelting process, coal dust rate of combustion of combustion zone in blast furnace is as shown in table 1 below.
Embodiment 4
The method that adopts embodiment 1, different, carrier gas is the oxygen rich gas of oxygen content 60 volume %.Coal dust rate of combustion of combustion zone in blast furnace is as shown in table 1 below.
Embodiment 5
The method that adopts embodiment 1, different, the oxygen enrichment percentage of blast furnace is 3 volume %.Coal dust rate of combustion of combustion zone in blast furnace is as shown in table 1 below.
Embodiment 6
The method that adopts embodiment 1, different, the temperature of carrier gas is 10 DEG C, pressure is 0.8MPa.Coal dust rate of combustion of combustion zone in blast furnace is as shown in table 1 below.
Embodiment 7
The method that adopts embodiment 1, different, coal dust is the hard coal of 80 microns of particle diameters.Coal dust rate of combustion of combustion zone in blast furnace is as shown in table 1 below.
Comparative example 1-7
The method that adopts respectively embodiment 1-7, different, carry out coal injection taking pressurized air as carrier gas.Coal dust rate of combustion of combustion zone in blast furnace is as shown in table 1 below.
Performance test
The rate of combustion of test coal dust combustion zone in blast furnace, as shown in table 1 below.
Table 1
| Embodiment numbering | Rate of combustion (%) | Comparative example numbering | Rate of combustion (%) |
| Embodiment 1 | 62 | Comparative example 1 | 50 |
| Embodiment 2 | 61 | Comparative example 2 | 49 |
| Embodiment 3 | 58 | Comparative example 3 | 48 |
| Embodiment 4 | 58 | Comparative example 4 | 50 |
| Embodiment 5 | 56 | Comparative example 5 | 47 |
| Embodiment 6 | 60 | Comparative example 6 | 48 |
| Embodiment 7 | 61 | Comparative example 7 | 49 |
Can find out from the result of performance test, in the case of the oxygen enrichment percentage of blast furnace is identical, method of the present invention can make the rate of combustion of pulverized coal injection in blast furnace in blast furnace ironmaking process improve.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition each the concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, also can carry out arbitrary combination between various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (9)
1. a method for blast-furnace smelting, is characterized in that, the method comprises: in blast furnace ironmaking process, coal dust and carrier gas are sprayed in blast furnace by the air port of blast furnace, wherein, described carrier gas is the oxygen rich gas that oxygen content is greater than 50 volume %.
2. method according to claim 1, wherein, described carrier gas is oxygen.
3. method according to claim 1 and 2, wherein, the temperature of described carrier gas is 10-25 DEG C, pressure is 0.8-1.2MPa.
4. method according to claim 3, wherein, the temperature of described carrier gas is 15-20 DEG C, pressure is 0.9-1.1MPa.
5. method according to claim 1, wherein, the method also comprises: before coal dust and carrier gas are sprayed into blast furnace by the air port of blast furnace, blast furnace is carried out to air blast oxygen enrichment.
6. method according to claim 5, wherein, it is 2-5 volume % that the straying quatity of described carrier gas and air blast oxygen enrichment make the oxygen enrichment percentage in blast furnace.
7. method according to claim 1 and 2, wherein, described coal dust is one or more in hard coal, lean coal and bituminous coal.
8. method according to claim 7, wherein, the particle diameter of described coal dust is 0.05-0.1mm.
9. method according to claim 1, wherein, the condition of described blast-furnace smelting comprises: the draught temperature of blast furnace is 1200-1250 DEG C, furnace top pressure is 120-200kPa.
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| CN201310236293.9A CN104060008A (en) | 2013-06-14 | 2013-06-14 | Blast furnace smelting method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109136431A (en) * | 2018-09-26 | 2019-01-04 | 首钢集团有限公司 | The method of fuel utilization efficiency is improved in a kind of blast furnace ironmaking process |
| CN117487979A (en) * | 2023-11-27 | 2024-02-02 | 山东钢铁集团永锋临港有限公司 | Method for improving oxygen enrichment rate and pulverized coal combustion rate of blast furnace |
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| CN87105969A (en) * | 1986-12-27 | 1988-07-20 | 日本钢管株式会社 | The method of operating blast furnaces |
| CN2439005Y (en) * | 2000-08-28 | 2001-07-11 | 宝山钢铁股份有限公司 | Rotary gas pulsation coal powder injection apparatus |
| JP2003286511A (en) * | 2002-03-29 | 2003-10-10 | Nippon Steel Corp | Method for improving flammability of low-volatile pulverized coal in blast furnace |
| CN101775451A (en) * | 2010-03-26 | 2010-07-14 | 中南大学 | Blast-furnace smelting method for vanadium titano-magnetite |
| CN102382915A (en) * | 2010-08-30 | 2012-03-21 | 上海国冶工程技术有限公司 | Method by adopting carbon dioxide as transmission medium for blast furnace coal injection |
| CN103014205A (en) * | 2012-12-31 | 2013-04-03 | 中冶京诚工程技术有限公司 | Oxygen supply method for oxygen-enriched coal injection of blast furnace |
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2013
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Patent Citations (6)
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| CN87105969A (en) * | 1986-12-27 | 1988-07-20 | 日本钢管株式会社 | The method of operating blast furnaces |
| CN2439005Y (en) * | 2000-08-28 | 2001-07-11 | 宝山钢铁股份有限公司 | Rotary gas pulsation coal powder injection apparatus |
| JP2003286511A (en) * | 2002-03-29 | 2003-10-10 | Nippon Steel Corp | Method for improving flammability of low-volatile pulverized coal in blast furnace |
| CN101775451A (en) * | 2010-03-26 | 2010-07-14 | 中南大学 | Blast-furnace smelting method for vanadium titano-magnetite |
| CN102382915A (en) * | 2010-08-30 | 2012-03-21 | 上海国冶工程技术有限公司 | Method by adopting carbon dioxide as transmission medium for blast furnace coal injection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109136431A (en) * | 2018-09-26 | 2019-01-04 | 首钢集团有限公司 | The method of fuel utilization efficiency is improved in a kind of blast furnace ironmaking process |
| CN117487979A (en) * | 2023-11-27 | 2024-02-02 | 山东钢铁集团永锋临港有限公司 | Method for improving oxygen enrichment rate and pulverized coal combustion rate of blast furnace |
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Application publication date: 20140924 |