CN109457075A - A kind of coal-based DR process using assisted Reduction - Google Patents
A kind of coal-based DR process using assisted Reduction Download PDFInfo
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- CN109457075A CN109457075A CN201811560320.7A CN201811560320A CN109457075A CN 109457075 A CN109457075 A CN 109457075A CN 201811560320 A CN201811560320 A CN 201811560320A CN 109457075 A CN109457075 A CN 109457075A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/008—Use of special additives or fluxing agents
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention relates to a kind of coal-based DR process using assisted Reduction, ferriferous oxide pelletizing and coal base reduction material are put into indoor to reduction, it uses combustion chamber to be heated to reduction room to promote to restore indoor furnace charge and carry out reduction reaction, is passed through auxiliary gas to reduction interior, auxiliary gas is containing CO2And CO and CO2Concentration is than the coal gas greater than 1.Utilize the CO in auxiliary gas2It is reacted with the C in furnace charge and generates reducing agent CO and assist the CO etc. contained in gas, increase the concentration of reduction section CO, accelerated diffusion of the CO into ferriferous oxide pelletizing, shorten the recovery time, improve production efficiency, auxiliary gas, which uses, contains CO2Coal gas.
Description
Technical field
The invention belongs to metal smelt technical fields, and in particular to a kind of coal-based direct reduction work using assisted Reduction
Skill.
Background technique
Direct Reduction Technology is broadly divided into two kinds of techniques of gas base and coal base.Gas base directly reducing has reduction rate fast, single
The outstanding features such as machine production capacity is big.Currently, gas base directly reducing DRI yield accounts for about the 80% of total output in the world, it is being reduced directly
Leading position is in technique.
In China, due to natural gas resource scarcity, rich coal resources, Coal-based Direct Reduction Technologies are by more and more
Concern.Coal-based direct reduction, which refers to, directly makees the method that reducing agent restores metal oxide with solid coal, and coal base is direct
Reduction can be used cheap mill coal as reducing agent.
China's Coal-based Direct Reduction Technologies mainly have: the processes such as rotary kiln, tunnel oven, rotary hearth furnace, shaft furnace, although this
A little techniques all using coal as reducing agent, but the equipment method of operation, combustion heating, material bed movement side, direct-reduction condition etc. just
There is very big difference in face.Wherein, the based shaft kiln directly reduced atmospheric condition of coal is preferable, and combustion heating efficiency is higher, and uses additional
Hot mode effect is especially good.
The reducing condition of coal-based DR process is mainly reduction temperature condition and reducing atmosphere condition.Coal base is directly also
Original is using coal as reducing agent, and under the high temperature conditions, the key reaction that Direct Reduction occurs is as follows:
FenOm+mC→nFe+mCO
mCO+FenOm→nFe+mCO2
mCO2+mC→2mCO
Reducing atmosphere condition refers mainly to CO atmosphere, and the rate of reduction of direct-reduction is related with CO concentration and CO diffusion.Reduction
The reduction reaction of section starts from the direct-reduction of C, then generates CO.Coal-based direct reduction rate is contacted by ferriferous oxide with C
The limitation that limitation and CO are spread into ferriferous oxide.
Generally for the outer direct-reduction for matching carbon pellets, due to ferriferous oxide contact with C it is limited, CO amount less and generation slowly,
CO is spread slowly into ferriferous oxide, leads to that the coal-based direct reduction time is long, production efficiency is low.
Summary of the invention
The present embodiments relate to a kind of coal-based DR process using assisted Reduction and a kind of mini-mill steelmaking works
Skill can at least solve the segmental defect of the prior art.
The present embodiments relate to a kind of coal-based DR process using assisted Reduction, by ferriferous oxide pelletizing and coal
Base reducing material is put into coal base reduction shaft furnace room, uses combustion chamber to heat the reduction room indoor to promote to restore
Furnace charge carries out reduction reaction, is passed through auxiliary gas to the reduction interior, the auxiliary gas is containing CO2And CO and CO2Concentration ratio is greater than
1 coal gas, makes CO2It is reacted with the C in furnace charge and generates CO, increase CO concentration in coal base reduction shaft furnace room, accelerated CO and aoxidized to iron
It is spread in object pelletizing, to improve reducing condition.
As one of embodiment, the auxiliary gas is the coal gas of reduction ceiling portion discharge.
As one of embodiment, reduction temperature is controlled at 1000~1200 DEG C.
As one of embodiment, the coal base reduction shaft furnace room includes sequentially connected preheating section, reduction section from top to bottom
And cooling section, the auxiliary gas are passed through from the cooling section.
As one of embodiment, the cooling section is located at outside the combustion chamber, cooling by the way of water-cooled jacket, is passed through
Gas and furnace charge is assisted to exchange heat to carry out supplement heat rejecter.
As one of embodiment, the coal base reduction shaft furnace room includes sequentially connected preheating section, reduction section from top to bottom
And cooling section, the cooling section are located at outside the combustion chamber, and secondary air road and the auxiliary are equipped in the cooling section wall
Flow channel extends in the reduction section, and the auxiliary gas is passed through from the reduction section.
As one of embodiment, the auxiliary gas is sprayed into the reduction section by air brick.
As one of embodiment, the mixed carbon comtent in the furnace charge is 350~500kg/tDRI.
The embodiment of the present invention at least has the following beneficial effects:
Coal-based DR process provided by the invention, by being passed through suitable auxiliary gas into coal base reduction shaft furnace room,
Utilize the CO in auxiliary gas2It is reacted with the C in furnace charge and generates CO and assist the CO etc. contained in gas, increase the dense of reducing zone CO
Degree improves the speed of CO mass transfer, diffusion, promotes the ferriferous oxide in CO reduction furnace charge, reduces Direct reduction degree, to improve also
Former speed and production efficiency reduce energy consumption.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structural schematic diagram of coal-based direct reduction shaft furnace provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a kind of coal-based DR process using assisted Reduction, by ferriferous oxide pelletizing and coal
Base reducing material is put into reduction room 1, and combustion chamber 2 is used to heat to promote to restore the furnace charge in room 1 the reduction room 1
6 carry out reduction reaction, and auxiliary gas 5 is passed through into the reduction room 1, and the auxiliary gas 5 is containing CO2And CO and CO2Concentration ratio is greater than
1 coal gas, makes CO2It is reacted with the C in furnace charge 6 and generates CO, increase CO concentration in coal base reduction shaft furnace room, accelerated CO and aoxidized to iron
It is spread in object pelletizing, to improve reducing condition.
Above-mentioned Direct Reduction carries out in coal-based direct reduction shaft furnace, such as Fig. 1, which is outer
Heated type shaft furnace is the shaft furnace of muffle heating in other words, and in reduction room 1, ferriferous oxide pelletizing and coal base reduction material can be
Reduction reaction is carried out in the case where isolation air.Above-mentioned coal-based direct reduction shaft furnace can be used that application No. is 201510550196.6
Or application No. is external heating types shaft furnaces such as the shaft furnaces provided in 201711234876.2 Chinese patent application, specific structure this
Place does not repeat.
Coal-based DR process provided in this embodiment is utilized by being passed through suitable auxiliary gas 5 into reduction room 1
Assist the CO in gas 52It is reacted with the C in furnace charge 6 and generates CO, and the CO etc. contained in auxiliary gas 5 increases the dense of reducing zone CO
Degree improves the speed of CO mass transfer, diffusion, promotes the ferriferous oxide in CO reduction furnace charge 6, to improve reduction rate and production effect
Rate reduces energy consumption.
In above-mentioned coal-based DR process, ferriferous oxide pelletizing can be the not carbonaceous pelletizing raw material for being unworthy of coal,
Can be the carbonaceous pelletizing that is mixed with coal raw material, preferably use carbon containing ferriferous oxide pelletizing, then with coal base reduction material
Together in investment to reduction room 1, direct-reduction and indirect reduction reaction can be carried out in pelletizing and outside pelletizing, improves reduction reaction
Speed.Above-mentioned coal base reduction material can be the coal based direct reducers such as coke blacking, bituminous coal, anthracite, can be with ferriferous oxide
It puts into reduction room 1, can also be arranged with ferriferous oxide pelletizing interlayer again after pelletizing mixing, that is, press the coal base reduction bed of material, iron oxygen
Compound pelletizing layer, the coal base reduction bed of material, ferriferous oxide pelletizing layer sequence stone.Preferably, the mixed carbon comtent in the furnace charge 6
For 350~500kg/tDRI, that is, carries out having more than needed and match carbon, the CO generated in one side guarantee and Direct Reduction2And auxiliary
CO in gas 52It is reacted, on the other hand, can prevent furnace charge 6 from bonding under the high temperature conditions.
Above-mentioned auxiliary gas 5 is preferably containing CO2And CO/CO2> 1 coal gas；Due to CO2The endothermic heat of reaction of CO is generated with C,
And excessive CO2It will lead to reoxidizing for Fe, therefore, the auxiliary gas being passed through should be appropriate, in particular, can consume a part of residual
C.Assist CO in the air demand and auxiliary gas of gas2Content, CO content, H2Ingredient, the ball of the ingredient of content and iron ore, coal
The factors such as size, the density of group are related, can be determined by experiment.
When using containing CO2Coal gas when, CO, H for containing in coal gas in itself2Etc. can further improve reducing condition, for example,
The product that can be the coal-based direct reduction shaft furnace itself, gathers materials on the spot, and can further decrease energy consumption, and reduce discharge, i.e.,
The auxiliary gas 5 is the coal gas being discharged at the top of the reduction room 1；It can certainly be the coal gas such as coal gas or coal gas of converter.
Above-mentioned coal-based DR process, such as Fig. 1 are advanced optimized, the reduction room 1 includes being sequentially connected from top to bottom
Preheating section, reduction section and cooling section, the auxiliary gas 5 is passed through from the cooling section, further preferably from cooling section top
It sprays into, furnace charge 6 herein is just begun to cool, and temperature is still higher, can be preheated and be guaranteed CO to auxiliary gas 52With furnace
The fat city of C reaction in material 6, moreover, auxiliary gas 5 is passed through from cooling section, it can be with the unreacted in downlink furnace charge 6
Remaining C reacted, provide CO for reduction section.And 6 pressure of furnace charge herein is relatively little, and auxiliary gas 5 is easy in infiltration
Row.
In the present embodiment, such as Fig. 1, the cooling section is located at outside the combustion chamber 2, and the mode for generalling use water-cooled jacket is cold
But, and downlink furnace charge 6 with also produce certain temperature drop in auxiliary 5 heat transfer process of gas, improve slow cooling efficiency.
Such as Fig. 1, spray head 3 directly can be set on reduction room 1, auxiliary gas 5 is sprayed into reduction room 1.Other excellent
It selects in embodiment, secondary air road is set in the wall of reduction room 1, auxiliary gas nozzle 3 is connected to the secondary air road, and
The side wall (namely reduction 1 inner wall of room) of close 1 inner cavity of reduction room in secondary air road uses air brick, which does not need
The purpose that auxiliary gas 5 is permeated into furnace charge 6 can be realized in very big injecting velocity and jetting pressure, and can be to avoid nozzle quilt
The case where powder furnace charge 6 blocks occurs, and, it preferably can restore 1 wall of room by cooling protection, improve service life.Into one
Preferably, above-mentioned secondary air road extends in reduction section step from cooling section, so that auxiliary gas 5 is passed through reduction room 1 from reduction section
It is interior, established direct reduced iron in cooling section can be polluted to avoid auxiliary gas 5.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of coal-based DR process using assisted Reduction puts into ferriferous oxide pelletizing and coal base reduction material to coal base
In reduction shaft furnace room, combustion chamber is used to heat the reduction room to promote to restore indoor furnace charge and carry out reduction reaction,
It is characterized by: being passed through auxiliary gas to the reduction interior, the auxiliary gas is containing CO2And CO and CO2Concentration is than the coal greater than 1
Gas makes CO2It is reacted with the C in furnace charge and generates CO, increase CO concentration in coal base reduction shaft furnace room, accelerate CO to ferriferous oxide pelletizing
Middle diffusion, to improve reducing condition.
2. using the coal-based DR process of assisted Reduction as described in claim 1, it is characterised in that: the auxiliary gas is
The coal gas of reduction ceiling portion discharge.
3. using the coal-based DR process of assisted Reduction as claimed in claim 1 or 2, it is characterised in that: reduction temperature
Control is at 1000~1200 DEG C.
4. using the coal-based DR process of assisted Reduction as claimed in claim 1 or 2, it is characterised in that: the coal base
Reduction shaft furnace room includes sequentially connected preheating section, reduction section and cooling section from top to bottom, and the auxiliary gas is from the cooling section
It is passed through.
5. using the coal-based DR process of assisted Reduction as claimed in claim 4, it is characterised in that: the cooling section
In outside the combustion chamber, cooling by the way of water-cooled jacket, the auxiliary gas and furnace charge being passed through exchange heat to carry out supplement heat rejecter.
6. using the coal-based DR process of assisted Reduction as claimed in claim 1 or 2, it is characterised in that: the coal base
Reduction shaft furnace room includes that sequentially connected preheating section, reduction section and cooling section, the cooling section are located at the burning from top to bottom
Outdoor is equipped with secondary air road in the cooling section wall and the secondary air road extends in the reduction section, described auxiliary
Gas is helped to be passed through from the reduction section.
7. using the coal-based DR process of assisted Reduction as claimed in claim 6, it is characterised in that: the auxiliary gas is logical
Air brick is crossed to spray into the reduction section.
8. using the coal-based DR process of assisted Reduction as described in claim 1, it is characterised in that: in the furnace charge
Mixed carbon comtent is 350~500kg/tDRI.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811560320.7A CN109457075A (en) | 2018-12-20 | 2018-12-20 | A kind of coal-based DR process using assisted Reduction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811560320.7A CN109457075A (en) | 2018-12-20 | 2018-12-20 | A kind of coal-based DR process using assisted Reduction |
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| Publication Number | Publication Date |
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| CN109457075A true CN109457075A (en) | 2019-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811560320.7A Pending CN109457075A (en) | 2018-12-20 | 2018-12-20 | A kind of coal-based DR process using assisted Reduction |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112877491A (en) * | 2021-01-14 | 2021-06-01 | 益晖国际有限公司 | Vertical coal-based and gas-based mixed metal iron direct reduction furnace and process thereof |
| CN113684337A (en) * | 2021-07-29 | 2021-11-23 | 张雷 | Method and device for optimizing iron ore by gas coal double-base direct reduction and magnetic separation |
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| CN103131816A (en) * | 2013-03-25 | 2013-06-05 | 李乾宽 | Method for producing spongy iron through dual-based reduction and special chamber type smelting vertical furnace therefor |
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| CN107904347A (en) * | 2017-11-30 | 2018-04-13 | 中冶南方工程技术有限公司 | A kind of coal-based direct reduction shaft furnace and its restoring method |
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| CN203999666U (en) * | 2014-08-05 | 2014-12-10 | 冯辉阳 | The shaft furnace of gas-coal-based direct reduction iron |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112877491A (en) * | 2021-01-14 | 2021-06-01 | 益晖国际有限公司 | Vertical coal-based and gas-based mixed metal iron direct reduction furnace and process thereof |
| CN113684337A (en) * | 2021-07-29 | 2021-11-23 | 张雷 | Method and device for optimizing iron ore by gas coal double-base direct reduction and magnetic separation |
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Application publication date: 20190312 |