CN107904347A - A kind of coal-based direct reduction shaft furnace and its restoring method - Google Patents
A kind of coal-based direct reduction shaft furnace and its restoring method Download PDFInfo
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- CN107904347A CN107904347A CN201711234876.2A CN201711234876A CN107904347A CN 107904347 A CN107904347 A CN 107904347A CN 201711234876 A CN201711234876 A CN 201711234876A CN 107904347 A CN107904347 A CN 107904347A
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
Abstract
The present invention provides a kind of coal-based direct reduction shaft furnace, including furnace body, top is provided with preheating section outside furnace body, furnace interior is from top to bottom disposed with material-feeding mechanism, combustion chamber and cooling section, reduction section is provided through in combustion chamber, preheating section is coaxially disposed by material-feeding mechanism and reduction section, the discharge port of material-feeding mechanism is connected with the feed inlet of reduction section, the discharge port of reduction section is connected with the feed inlet of cooling section, preheating pars infrasegmentalis is equipped with heat source introducing port, the top of combustion chamber is exported equipped with high-temp waste gas, high-temp waste gas outlet is connected by the heat source introducing port of exhaust emission tube road and preheating section.Preheating section is arranged on the outside of combustion chamber by the reduction shaft furnace, so that preheating section use commonly keeps the temperature resistance to material and builds by laying bricks or stones, safeguard simple, the highly-conductive hot carbon SiClx heat conducting tank of resistance to material height in combustion chamber is significantly reduced at the same time, reduce the resistance to timber-used amount of carborundum, save cost of investment, and combustion chamber height reduction, the uniformity of easily controllable reduction section temperature.
Description
Technical field
The invention belongs to Direct Reduction Technology field, and in particular to a kind of coal-based direct reduction shaft furnace and its restoring method.
Background technology
The conventional method of production direct reduced iron is directly to be gone back the iron ore containing iron oxide or pelletizing with reducibility gas
It is former and obtain reduced iron, by taking Midrex methods as an example, in the method for such production direct reduced iron, by things such as natural gases
Manufactured reducing gas forcibly enters shaft furnace from positioned at the air port of shaft furnace bottom, with the oxide of reduced iron, so as to be gone back
Former iron.
In recent years, the new method for producing reduced iron is the carbonaceous material substitution natural gas with such as coal etc, is gone back with coal
Former agent, it is known that such as rotary hearth furnace, rotary kiln, reduce the fired pelletizing made of stones with iron ore by heating, and obtain gold
Belong to iron, this kind of technique receives an acclaim in the area for lacking natural gas.But there are Deoxidation Atmosphere in Furnace and oxidation for this kind of technique
Property atmosphere coexist, there is the problem of reoxidizing in metallic iron after reduction, product quality is difficult to improve.To solve this problem, carry
Muffle Coal-based Direct Reduction Technologies are gone out, which is provided separately room is reduced with combustion chamber, and heat enters reduction by conducting
Room so that reduction interior has good reducing atmosphere；As patent document CN101215614A discloses a kind of reduction room and adds
The closed interval of hot cell multilayer and fusion gasification combination metal smelting method, in this way by metal oxides such as reducing agent and iron ores
The reduction room of direct reduction unit is added after being mixed in a certain ratio, reduction indoor metal oxide is reduced agent also at high temperature
It is former to separate fever room or reduction room using heat conduction is closed into sponge iron, direct reduction unit；And for example patent document CN2921740Y,
Patent document CN1818081A discloses a kind of interior external heat vertical passway reduction furnace and the method using stove production sponge iron,
Material top-down continuous operation in reduction furnace, the reduction furnace are divided into preheating zone and heating reduction reaction band in reduction furnace
Preheating zone must be provided with row's burner, and heating zone of reduction must be provided with 3-4 row's burners, laterally stand up 2-6 retort in stove, indulge
To 4-100 row's retort is placed, there is one group of burner to be used to heat the periphery of retort between every two tank, the bottom of each retort
Portion designs an interior burner, insulating layer is equipped with all retort lower part outlets in reduction furnace, by the iron of oxides-containing iron
Miberal powder and binding agent mixed pelletizing, iron ball outer layer glue last layer carbon dust and are oxidized to double-deck iron oxide pellet through high-temperature flue gas again, will be double
Layer iron oxide pellet and anthracite or coke end add the double-deck SiC reactions for the interior external heat being fixed in the reduction furnace of tunnel-kiln type
In tank, sponge iron is prepared.
But using above-mentioned coal base reduction method produce direct reduced iron when easily there arises a problem that：Furnace charge is because between use
Heating and reduction are connect, for residing time in furnace when 50-60 is small, whole reduction furnace is up to more than ten rice in reduction furnace, on the one hand
The high heat conduction reduction furnaces for needing to consume a large amount of costlinesses are built by laying bricks or stones with refractory material, and on the other hand, distance is longer in short transverse, it is difficult to
Realize being evenly heated for furnace charge, serious shadow end product quality.In view of the above-mentioned problems, one as disclosed in patent CN205576193U
Kind direct reduced iron production reduction furnace, sets at least two layers interlaced intercepter from bottom to top in the combustion chamber.But
In view of actual design, investment and production run, this method significantly increases the complexity and device fabrication difficulty of reduction furnace,
Overhaul and difficult in maintenance, it is minimum that this method is applied to industrial possibility.
The content of the invention
For the above-mentioned problems in the prior art, the object of the present invention is to provide a kind of coal-based direct reduction to erect
Stove, can significantly reduce indirectly heat reduction furnace high heat conduction refractory material dosage, while realize that furnace charge is overall uniform in stove
Heating, ensures that product quality is stablized.
The technical scheme is that a kind of coal-based direct reduction shaft furnace is provided, including furnace body, furnace body outside top
Preheating section is provided with, the furnace interior is from top to bottom disposed with material-feeding mechanism, combustion chamber and cooling section, the combustion chamber
Reduction section is inside provided through, the preheating section is coaxially disposed by material-feeding mechanism and reduction section, the discharging of the material-feeding mechanism
Mouth is connected with the feed inlet of reduction section, and the discharge port of the reduction section is connected with the feed inlet of cooling section, the preheating pars infrasegmentalis
Equipped with heat source introducing port, the top of the combustion chamber is exported equipped with high-temp waste gas, and high-temp waste gas outlet passes through exhaust emission tube
Road is connected with the heat source introducing port of the preheating section.
Further, the preheating section and material-feeding mechanism are equipped with multiple, the quantity phase of the preheating section and material-feeding mechanism
Same and one-to-one corresponding is arranged on above each material-feeding mechanism.
Further, the reduction section and material-feeding mechanism are equipped with multiple, the quantity phase of the material-feeding mechanism and reduction section
Same and one-to-one corresponding is arranged on above each reduction section, and the preheating section, material-feeding mechanism and the reduction section being respectively correspondingly arranged are coaxially arranged.
Further, each reduction section array is arranged in the combustion chamber.
Further, the cooling section is equipped with multiple, and the discharge port one of each cooling section and each reduction section is a pair of
It should connect.
Further, multiple burners have circumferentially been evenly arranged on the side wall of the combustion chamber.
Further, the top of the reduction section is exported equipped with coal gas of high temperature, and coal gas of high temperature outlet is drawn by coal gas
Pipe is connected with the combustion chamber.
Further, the top of the reduction section is exported equipped with coal gas of high temperature, and coal gas of high temperature outlet passes through branch gas tube
It is connected with the coal gas processing mechanism outside furnace body.
In addition, present invention also offers the restoring method using above-mentioned coal-based direct reduction shaft furnace, following step is specifically included
Suddenly：
1) preheat：Agglomerate to be restored and carbonaceous reducing agent are mixed, mixes and expects to be fitted into preheating section to run from top to bottom, while by
Heat source introducing port imports high temperature heat source into preheating section, and high temperature heat source is run from bottom to top is preheated to 600~900 to mixing material
℃。
2) reduce：Agglomerate and carbonaceous reducing agent to be restored after preheating enter in reduction section through material-feeding mechanism cloth, also
The high-temperature flue gas that agglomerate and the carbonaceous reducing agent room of being burned burning to be restored produces in former section is heated to 1000~1250 DEG C and goes forward side by side
Row reduction reaction.
3) agglomerate to be restored is reduced into metal, is cooled down after reduction section discharge into cooling section, while combustion chamber
The high-temp waste gas produced that burns is reused by exhaust emission tube road into preheating section.
Specifically, the agglomerate to be restored is metal oxide agglomerate or iron content zinc powder sludge pellet block, the carbonaceous reducing agent
For anthracite or coke breeze.
Compared with prior art, beneficial effects of the present invention：
(1) preheating section is arranged on the outside of combustion chamber by this coal-based direct reduction shaft furnace provided by the invention so that preheating section
Built by laying bricks or stones, safeguarded simply, while significantly reduce the resistance to material heat conduction of highly-conductive hot carbon SiClx in combustion chamber using resistance to material is commonly kept the temperature
Tank height, reduces the resistance to timber-used amount of carborundum, saves cost of investment, and combustion chamber height reduction, easily controllable reduction section temperature
Uniformity.
(2) heat source used of preheating section quoted from combustion chamber, carries in this coal-based direct reduction shaft furnace provided by the invention
The high thermal efficiency of the reduction shaft furnace, while preheated in preheating section using high-temperature flue gas adverse current direct contact heat transfer mode, heat exchange
Efficient, firing rate is fast, is obviously improved reduction shaft furnace production efficiency.
The present invention is described in further details below with reference to attached drawing.
Brief description of the drawings
Fig. 1 is the structure diagram of coal-based direct reduction shaft furnace in embodiment 1；
Fig. 2 is the structure diagram of coal-based direct reduction shaft furnace in embodiment 2；
Fig. 3 is the structure diagram of coal-based direct reduction shaft furnace in embodiment 3；
Description of reference numerals：1st, preheating section；2nd, exhaust gas endless tube；3rd, furnace body；4th, material-feeding mechanism；5th, reduction section；6th, combustion chamber；7th, burn
Mouth；8th, cooling section；9th, exhaust emission tube road；10th, exhaust gas imports branch pipe；11st, heat source introducing port；12nd, coal gas fairlead；13rd, coal
Gas branch pipe；14th, coal gas processing mechanism.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained all other without making creative work
Embodiment, belongs to the scope of protection of the invention.
In the description of the present invention, it is to be understood that term " " center ", " on ", " under ", "front", "rear", " left side ",
The orientation or position relationship of the instruction such as " right side ", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " are based on shown in the drawings
Orientation or position relationship, are for only for ease of the description present invention and simplify description, rather than instruction or imply signified device or
Element must have specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention；
In description of the invention, unless otherwise indicated, " multiple " are meant that two or more.
Embodiment 1：
As shown in Figure 1, a kind of coal-based direct reduction shaft furnace is present embodiments provided, including furnace body 3, the outside of furnace body 3 top
Preheating section 1 is provided with, material-feeding mechanism 4, combustion chamber 6 and cooling section 8 are from top to bottom disposed with inside the furnace body 3, it is described
Reduction section 5 is provided through in combustion chamber 6, the preheating section 1 is coaxially disposed by material-feeding mechanism 4 and reduction section 5, the cloth
The discharge port of mechanism 4 is connected with the feed inlet of reduction section 5, and the discharge port of the reduction section 5 is connected with the feed inlet of cooling section 8,
1 lower part of preheating section is equipped with heat source introducing port 11, and the top of the combustion chamber 6 is exported equipped with high-temp waste gas, the high-temp waste gas
Outlet is connected by exhaust emission tube road 9 with the heat source introducing port 11 of the preheating section 1.Wherein, material-feeding mechanism 4 is distributing device；
The horizontal cross-section of preheating section 1 and reduction section 5 is rounded or square, preferably circular, to improve edge in preheating section 1 and reduction section 5
The radially temperature uniformity in each region, so as to improve the uniformity of reduction reaction.
The process reduced using the coal-based direct reduction shaft furnace to agglomerate to be restored is as follows：First, group to be restored
The high temperature heat source that block and carbonaceous reducing agent are entered in operational process by 1 bottom of preheating section from top to bottom in preheating section 1 is direct
After transmission of heat by contact is preheated to 600~900 DEG C, into material-feeding mechanism 4, passed in preheating section 1 using the directly contact of high temperature heat source adverse current
Hot mode preheats, and heat exchange efficiency is high, and firing rate is fast, can be obviously improved reduction shaft furnace production efficiency；Then, by material-feeding mechanism 4
High temperature pelletizing after will be preheated is distributed into reduction section 5, and agglomerate to be restored and carbonaceous reducing agent are burned room in reduction section 5
6 high-temperature flue gas produced are further heated to 1000~1250 DEG C and carry out reduction reaction, and agglomerate to be restored is reduced into gold
Belong to, be expelled in cooling section 8 and cooled down from 5 lower part of reduction section, and the high-temp waste gas that the burning of combustion chamber 6 at this time produces can pass through
The high temperature heat source that exhaust emission tube road 9 enters in preheating section 1 as preheating section 1 carries out agglomerate to be restored and carbonaceous reducing agent
Preheating, effectively increases the efficiency of utilization of the reduction shaft furnace, the extraction temperature of high-temp waste gas is 700~1000 DEG C.Wherein, institute
It is metal oxide agglomerate or iron content zinc powder sludge pellet block to state agglomerate to be restored, and the carbonaceous reducing agent is selected coal dust, preferably waved
Send out temperature higher anthracite or coke breeze.Compared to the combustion that preheating section and reduction section are arranged to furnace body in existing reduction furnace
Burn interior to be preheated and reduced, preheating section 1 is arranged in the outside of combustion chamber 6 in the present embodiment, it is easy to maintain, and can reduce
The heat resisting temperature of 1 resistance to material of preheating section, without selecting expensive carborundum to use valency as 1 resistance to material of preheating section
The cheap resistance to material of commonly insulation of lattice is built by laying bricks or stones, reduces equipment investment cost, and arrangement reduction section 5 is only needed in combustion chamber 6, is shown
Work reduces the highly-conductive hot carbon SiClx heat conducting tank of resistance to material height in combustion chamber 6, the reduction resistance to timber-used amount of carborundum, while combustion chamber 6
Height also significantly reduces, the uniformity of temperature in the easily controllable reduction section 5.
Certainly, preheating section 1 is placed at it in the present embodiment, and the agglomerate and carbonaceous reducing agent to be restored after preheating are again by upper
Material device and material-feeding mechanism are distributed into reduction section, can reach identical effect with this present embodiment, but compare and in this present embodiment will
Preheating, 1 is placed directly within for the preheating method on 3 top of furnace body, adds the transporting device and high-temperature flue gas stringing of high temperature pelletizing
Complexity, be unfavorable for the economy and feasibility of reduction shaft furnace.
And in order to further improve the production efficiency of the reduction furnace, the preheating section 1 and material-feeding mechanism 4 can be equipped with
Multiple, the preheating section 1 is identical with the quantity of material-feeding mechanism 4 and corresponds arranged on each top of material-feeding mechanism 4；Correspondingly, institute
State reduction section 5 also set it is multiple, the material-feeding mechanism 4 it is identical with the quantity of reduction section 5 and correspond be arranged on each reduction section 5 on
Side, the preheating section 1, material-feeding mechanism 4 and the reduction section 5 being respectively correspondingly arranged are coaxially arranged.It is corresponding, can be by the cooling section 8
Also set multiple, the discharge port of each cooling section 8 and each reduction section 5 connects one to one.In addition, in order to improve reduction
The uniformity that 5 heating-up temperatures of section and reduction reaction carry out, to ensure the greater homogeneity of product, it is preferred that by each reduction
5 arrays of section are arranged in the combustion chamber 6；Multiple burners 7 have circumferentially been evenly arranged on the side wall of the combustion chamber 6.And it is
The high-temp waste gas produced in combustion chamber 6 is imported into each preheating section 1 by convenience, and exhaust emission tube road 9 one end is accessed and is burnt
In room 6, other end connection exhaust gas endless tube 2, each preheating section 1 is enclosed in the exhaust gas endless tube 2, is set on exhaust gas endless tube 2 multiple useless
Conductance enters branch pipe 10, and import branch pipe 10 by exhaust gas is connected with the heat source introducing port 11 of each preheating section 1, so that in combustion chamber 6
The high-temp waste gas of generation enters in each preheating section 1, ensure that the uniformity and uniformity of temperature in each preheating section 1.
Embodiment 2：
As shown in Fig. 2, on the basis of the structure for the coal-based direct reduction shaft furnace that above-described embodiment 1 provides, the reduction section 5
Top is exported equipped with coal gas of high temperature, and coal gas of high temperature outlet is connected by coal gas fairlead 12 with the combustion chamber 6.
A kind of specific embodiment, will be loaded in preheating section 1, this is pre- by the agglomerate of iron ore concentrate and carbonaceous reducing agent preparation
Hot arc 1 high 4m, wide 0.4m, long 1.2m, totally 4 preheating sections.Agglomerate is run from top to bottom in preheating section 1, what combustion chamber 6 produced
High-temp waste gas is run from bottom to top, and high-temp waste gas introduces 800 DEG C of temperature, 200 DEG C of discharge temperature, and agglomerate is heated in preheating section 1
To 650 DEG C, it is distributed into through material-feeding mechanism 4 in the reduction section 5 of furnace body 3,5 quantity of reduction section is consistent with 1 quantity of preheating section, reduction section 5
Height 4.2m, wide 0.4m, long 1.2m, in reduction section 5, agglomerate is burned the high-temperature flue gas that the burning of room 6 produces and is heated to 1100
DEG C, reduction reaction occurs, produces sponge iron, high-temperature sponge iron hot sending electric furnace steel making, and the high-temperature coal of generation is reduced in reduction section 5
Gas is introduced to burning in combustion chamber 6 by coal gas fairlead 12, as heating fuel, improves energy utilization rate.
Embodiment 3：
As shown in figure 3, on the basis of the structure for the coal-based direct reduction shaft furnace that above-described embodiment 1 provides, the reduction section 5
Top is exported equipped with coal gas of high temperature, and coal gas of high temperature outlet passes through branch gas tube 13 and the coal gas processing mechanism 14 outside furnace body 3
Connection.
A kind of specific embodiment, will be loaded in preheating section 1, in advance by the agglomerate of metallurgical dust and carbonaceous reducing agent preparation
Hot arc 1 high 4m, wide 0.4m, long 1.2m, totally 4 preheating sections 1, agglomerate run from top to bottom in preheating section 1, the burning of furnace body 3
The high-temp waste gas that burning produces in room 6 is run from bottom to top, and high-temp waste gas introduces 1000 DEG C of temperature, 250 DEG C of discharge temperature, agglomerate
850 DEG C are heated to, reduction section is distributed into through material-feeding mechanism 4,5 quantity of reduction section is consistent with 1 quantity of preheating section, the height of reduction section 5
4.2m, wide 0.4m, long 1.2m, in reduction section 5, agglomerate is burned the high-temperature flue gas that the burning of room 6 produces and is heated to 1150 DEG C, hair
Raw reduction reaction, produces sponge iron, sponge iron is sent into blast furnace after the cooling of cooling section 8 or converter uses；In reduction section 5 also at the same time
The coal gas of high temperature that original reaction produces is introduced after coal gas processing mechanism 14 is handled by branch gas tube 13 to be used as fuel to repeat profit
With improving energy utilization rate.
In conclusion preheating section is arranged on the outside of combustion chamber by this coal-based direct reduction shaft furnace provided by the invention,
Indirectly heat reduction furnace high heat conduction refractory material dosage is significantly reduced, while realizes that entirety of the furnace charge in stove is evenly heated, is protected
Demonstrate,prove product quality to stablize, and significantly reduce process energy consumption.
The foregoing examples are only illustrative of the present invention, does not form the limitation to protection scope of the present invention, all
It is to be belonged to the same or similar design of the present invention within protection scope of the present invention.
Claims (10)
1. a kind of coal-based direct reduction shaft furnace, including furnace body (3), it is characterised in that：The exterior top of the furnace body (3) is provided with pre-
Hot arc (1), the furnace body (3) is internal to be from top to bottom disposed with material-feeding mechanism (4), combustion chamber (6) and cooling section (8), institute
State in combustion chamber (6) and be provided through reduction section (5), the preheating section (1) is coaxial by material-feeding mechanism (4) and reduction section (5)
Set, the discharge port of the material-feeding mechanism (4) connects with the feed inlet of reduction section (5), the discharge port of the reduction section (5) with it is cold
But the feed inlet connection of section (8), preheating section (1) lower part are equipped with heat source introducing port (11), and the top of the combustion chamber (6) is set
There is high-temp waste gas outlet, high-temp waste gas outlet passes through exhaust emission tube road (9) and the heat source introducing port of the preheating section (1)
(11) connect.
2. coal-based direct reduction shaft furnace as claimed in claim 1, it is characterised in that：The preheating section (1) and material-feeding mechanism (4)
Be equipped with it is multiple, the preheating section (1) it is identical with the quantity of material-feeding mechanism (4) and correspond be arranged on each material-feeding mechanism (4) on
Side.
3. coal-based direct reduction shaft furnace as claimed in claim 2, it is characterised in that：The reduction section (5) and material-feeding mechanism (4)
Be equipped with it is multiple, the material-feeding mechanism (4) it is identical with the quantity of reduction section (5) and correspond be arranged on each reduction section (5) above,
The preheating section (1), material-feeding mechanism (4) and the reduction section (5) being respectively correspondingly arranged are coaxially arranged.
4. coal-based direct reduction shaft furnace as claimed in claim 3, it is characterised in that：Each reduction section (5) array is arranged in
In the combustion chamber (6).
5. coal-based direct reduction shaft furnace as claimed in claim 3, it is characterised in that：The cooling section (8) is equipped with multiple, each institute
State cooling section (8) and the discharge port of each reduction section (5) connects one to one.
6. coal-based direct reduction shaft furnace as claimed in claim 1, it is characterised in that：Along week on the side wall of the combustion chamber (6)
To being evenly arranged multiple burners (7).
7. coal-based direct reduction shaft furnace as claimed in claim 1, it is characterised in that：The top of the reduction section (5) is equipped with height
Warm gas exit, coal gas of high temperature outlet are connected by coal gas fairlead (12) with the combustion chamber (6).
8. coal-based direct reduction shaft furnace as claimed in claim 1, it is characterised in that：The top of the reduction section (5) is equipped with height
Warm gas exit, coal gas of high temperature outlet are connected by branch gas tube (13) the coal gas processing mechanism (14) exterior with furnace body (3).
9. using the restoring method such as claim 1~8 any one of them coal-based direct reduction shaft furnace, it is characterised in that：Bag
Include following steps：
1) preheat：Agglomerate to be restored and carbonaceous reducing agent are mixed, mixes and expects to be fitted into preheating section (1) to run from top to bottom, together
When run from bottom to top from heat source introducing port (11) to high temperature heat source, high temperature heat source is imported in preheating section (1) to mixing material preheating
To 600~900 DEG C；
2) reduce：Agglomerate and carbonaceous reducing agent to be restored after preheating enter in reduction section (5) through material-feeding mechanism (4) cloth,
In reduction section (5) agglomerate and carbonaceous reducing agent to be restored be burned the high-temperature flue gas that room (6) burning produces be heated to 1000~
1250 DEG C and carry out reduction reaction；
3) agglomerate to be restored is reduced into metal, is cooled down into cooling section (8) after reduction section (5) discharge, burnt at the same time
The high-temp waste gas that room (6) burning produces is reused by exhaust emission tube road (9) into preheating section (1).
10. restoring method as claimed in claim 9, it is characterised in that：The agglomerate to be restored for metal oxide agglomerate or
Iron content zinc powder sludge pellet block, the carbonaceous reducing agent are anthracite or coke breeze.
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| CN111534659A (en) * | 2020-06-11 | 2020-08-14 | 武汉科思瑞迪科技有限公司 | Parallel heat accumulating type gas-based shaft furnace and method for producing direct reduced iron |
| CN112981030A (en) * | 2021-02-23 | 2021-06-18 | 中冶南方工程技术有限公司 | Treatment furnace |
| CN113088609A (en) * | 2021-04-13 | 2021-07-09 | 董玉平 | Gas double-base reduction furnace and method for manufacturing reduced iron by using same |
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| CN109457075A (en) * | 2018-12-20 | 2019-03-12 | 中冶南方工程技术有限公司 | A kind of coal-based DR process using assisted Reduction |
| CN111534659A (en) * | 2020-06-11 | 2020-08-14 | 武汉科思瑞迪科技有限公司 | Parallel heat accumulating type gas-based shaft furnace and method for producing direct reduced iron |
| CN111534659B (en) * | 2020-06-11 | 2023-04-28 | 武汉科思瑞迪科技有限公司 | Parallel heat accumulating type gas-based shaft furnace and method for producing direct reduced iron |
| CN112981030A (en) * | 2021-02-23 | 2021-06-18 | 中冶南方工程技术有限公司 | Treatment furnace |
| CN113088609A (en) * | 2021-04-13 | 2021-07-09 | 董玉平 | Gas double-base reduction furnace and method for manufacturing reduced iron by using same |
| CN113088609B (en) * | 2021-04-13 | 2022-06-17 | 黎城太行钢铁有限公司 | Gas double-base reduction furnace and method for manufacturing reduced iron by using same |
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