CN109321703A - A kind of short route fused reduction iron-smelting system and method - Google Patents
A kind of short route fused reduction iron-smelting system and method Download PDFInfo
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- CN109321703A CN109321703A CN201811303409.5A CN201811303409A CN109321703A CN 109321703 A CN109321703 A CN 109321703A CN 201811303409 A CN201811303409 A CN 201811303409A CN 109321703 A CN109321703 A CN 109321703A
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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
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
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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
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
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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
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
Abstract
The present invention relates to a kind of short route fused reduction iron-smelting system and methods, belong to ironmaking technology field, including the direct-reduction of fuel pulverizing plant, Iron Ore Powder preparation facilities, Iron Ore Powder and coke breeze preparation facilities, gas-solid separating device；The U-shaped structure that Iron Ore Powder direct-reduction is communicated with coke breeze preparation facilities for bottom, two sides are respectively low-temperature reduction section, high temperature reduction section, bottom is melting and reducing section, the bottom of melting and reducing section obtains molten iron, the fuel pulverizing plant, Iron Ore Powder preparation facilities are connect with low-temperature reduction section middle and lower part, bottom respectively, low-temperature reduction section is connect with gas-solid separating device, and gas-solid separating device is connect with the top combustion device of high temperature reduction section, middle part respectively.By three-level reduced iron miberal powder, the reproducibility feature of coal dust different component is made full use of, realizes the multilevel reduction of coal dust and Iron Ore Powder, the final comprehensive high-efficiency clean utilization for realizing coal and iron ore, on the basis of realizing that the sub-prime of coal dust makes full use of, completes short route and practice iron process.
Description
Technical field
The invention belongs to ironmaking technology fields, and in particular to a kind of short route fused reduction iron-smelting system and method.
Background technique
Current ironmaking technology is mainly based on blast furnace ironmaking, and blast furnace technology by constantly improving and complete for a long time
It is kind, a maturation, advanced production technology are had been developed as, competitiveness reaches unprecedented level.But the hair of blast furnace
There is also problems for exhibition, and blast furnace technology entirety production procedure is too long, the production process of sinter, pellet and coke
Cause serious big gas and water and dust pollution；Meanwhile blast furnace coking coal a large amount of consumption and its reserves it is less between contradiction ask
Topic, certainly will bring crisis to the follow-up developments of blast furnace.
The enhancing of variation and environmental consciousness recently as global energy markets, non-blast furnace ironmaking technology is as a kind of clear
Clean energy-efficient new technology, new process, increasingly by the highest attention of people in the industry.For this purpose, it is proposed that a kind of use coal dust
It is reduced directly the novel short route fused reduction iron-smelting technology meter systems of Iron Ore Powder.In this new technology system, can directly it make
It is realized with coal dust and Iron Ore Powder three-level is restored, on the basis of guaranteeing reduction effect, greatly shorten ironmaking process, it can be well
Achieve the effect that energy-saving and emission-reduction.
Summary of the invention
For above-mentioned problems of the prior art, it is an object of the present invention to provide a kind of short route melting and reducings
Ironmaking system.By optimizing to coal coke technique, realize that high temperature powdery coke recycles in furnace, while being made with high fever
The hydrogen-rich gas of value is reduced directly Iron Ore Powder using this coal dust gasification reproducibility coal gas；Meanwhile coal dust and Iron Ore Powder are in high temperature ring
Also the reaction of formula carbon heat reducing can be in contact under border, last coal dust and Iron Ore Powder are all melted in bottom molten iron reduction pond, real
The final of existing iron ore also originates in iron.
In order to solve the above technical problems, the technical solution of the present invention is as follows:
A kind of short route fused reduction iron-smelting system, including fuel pulverizing plant, Iron Ore Powder preparation facilities, Iron Ore Powder are direct
Reduction and coke breeze preparation facilities, gas-solid separating device；The U-shaped knot that Iron Ore Powder direct-reduction is communicated with coke breeze preparation facilities for bottom
Structure, two sides are respectively low-temperature reduction section, high temperature reduction section, and bottom is melting and reducing section, and the bottom of melting and reducing section obtains molten iron,
The fuel pulverizing plant, Iron Ore Powder preparation facilities are connect with low-temperature reduction section middle part, bottom respectively, low-temperature reduction section and gas-solid
Separator connection, gas-solid separating device are connect with the top combustion device of high temperature reduction section, middle part respectively.
Present applicant proposes a kind of systems of the short route fused reduction iron-smelting of three-level reduction iron production, make full use of coal dust not
With the reproducibility feature of component, the multilevel reduction of coal dust and Iron Ore Powder, the final comprehensive high-efficiency cleaning for realizing coal and iron ore are realized
It utilizes.
Preferably, Iron Ore Powder preparation facilities includes that sequentially connected iron ore storehouse, muck storehouse, the first flour mill, cloth bag remove
Dirt device, mineral powder bin, miberal powder batcher.
Preferably, the fuel pulverizing plant include sequentially connected run coal bin, crusher, broken coal storehouse, the second flour mill,
Rough coal separator, rough coal powder cabin, coal dust batcher.
It is further preferred that rough coal separator is connect with bag filter.
Preferably, the feeding manner of Iron Ore Powder preparation facilities and fuel pulverizing plant is one to liquidate, in the circle of contact and W type
Kind.
As the another embodiment of the application, gas-solid separating device includes gas-solid separator from top to bottom, first
Dipleg, separation raw material cabin, the second dipleg, the first dipleg are connect with the top combustion device of high temperature reduction section, the second dipleg and height
The middle part of warm reduction section connects, and the second outlet is arranged in the top of gas-solid separating device.
As a kind of embodiment of the application, gas-solid separating device includes sequentially connected burnt iron separator and coke breeze
Separator, burnt iron separator are connect with the middle part of high temperature reduction section, and the top of coke breeze separator and high temperature reduction section is fired
Burner connection.
It is further preferred that burnt iron separator includes that burnt iron separator, semi-reduction iron powder storehouse, iron powder L expect from top to bottom
Leg.
Burnt iron separator separates semi-reduction iron powder, and coke breeze separator separates coke breeze.
It is further preferred that coke breeze separator includes coke breeze separator, coke breeze L dipleg from top to bottom.
Still more preferably, first discharge port is arranged in the top of coke breeze separator.
Both the above embodiment is that feed-type is different.
The coal gas that outlet discharge generates carries out subsequent processing.
Preferably, melting and reducing section is respectively slag exit, carbon iron melting and reducing section, molten iron outlet from top to bottom.
Impurity forms slag under the action of flux, and slag density is lower, is discharged in upper outlet, molten iron then goes out in bottom
Mouth outflow.
The fuel pulverizing plant can be realized thick, the fine powder classified utilization of coal dust, while can realize between thick, fine powder
Consumption balance matching；Iron ore can be ground in required granularity input coefficient furnace by the Iron Ore Powder preparation facilities, while realize refining
The addition of flux needed for iron.Raw material a part that the gas-solid separating device flies out low-temperature reduction section returns to high temperature reduction section.
The method that the system of above-mentioned short route fused reduction iron-smelting carries out reduction iron production, specific steps are as follows:
1) preparation of raw material
The process of raw coal and iron ore by broken, milling, separation respectively enters pulverized coal bin, mineral powder bin, spare；
2) low-temperature reduction
In low-temperature reduction section, in conjunction with the coal gas of high temperature effect that the conveying of high temperature reduction section comes, the coal dust gasification combustion of input
It burns and further generates coal gas, rough coal powder can be gasified totally to obtain coke breeze, and Iron Ore Powder is further under the action of reproducibility coal gas
Reduction reaction occurs, the coal gas of generation, coke breeze, semi-reduction Iron Ore Powder are by entering burnt iron separator at the top of low-temperature reduction section；
3) high temperature reduction
The coke breeze separated is sent into the burner at the top of high temperature reduction section by coke breeze separator, is being passed through combustion-supporting gas
Under body (air or oxygen rich gas) effect, gasification, and combustion reaction occurs, generates reproducibility coal gas and coke；Burnt iron separator will
The semi-reduction Iron Ore Powder separated is sent into the middle part of high temperature reduction section, under the action of reproducibility coal gas and high temperature, semi-reduction iron
Miberal powder and coal gas, high temperature coke breeze further occurrence reduction reaction；
4) melting and reducing
Low-temperature reduction section, the complete miberal powder of high temperature reduction section unreacted and coke breeze under high temperature action in molten condition into
Entering melting and reducing section, concurrently raw reduction reaction has finally obtained molten iron.
Preferably, coal dust is divided into rough coal powder and fine breeze in rough coal separator in step 1), fine breeze enters cloth bag and removes
Dirt device is mixed into burner hearth low-temperature reduction section with Iron Ore Powder.
Preferably, the partial size of the rough coal powder of rough coal powder cabin is 0.05-5mm, and the partial size of the miberal powder of mineral powder bin is 0.05-8mm.
Preferably, the temperature of low-temperature reduction section is 900-1100 DEG C, and the temperature of high temperature reduction section is 1300-1600 DEG C.
Beneficial effects of the present invention:
1) first segment low temperature coal gas reduced iron miberal powder, second segment coal gas of high temperature and coke breeze restore semi-reduction Iron Ore Powder jointly,
Third section molten condition coke breeze reduced iron miberal powder makes full use of the reproducibility of coal dust different component by three-level reduced iron miberal powder
Feature realizes that the multilevel reduction of coal dust and Iron Ore Powder, the final comprehensive high-efficiency clean utilization for realizing coal and iron ore, short route are practiced
Iron, while can also obtain a certain amount of coal gas；
2) the novel short route ironmaking system technique of coal dust melting and reducing Iron Ore Powder of the invention can realize the sub-prime of coal dust
It makes full use of, to realize the abundant prereduction of Iron Ore Powder, and then reaches better abundant reduction effect；
3) coal dust and miberal powder are after broken, milling, and rough coal material enters the bottom of low-temperature reduction section, and duff material enters low temperature
The middle and lower part of reduction section, the available sufficient gasification, and combustion of fine breeze obtain the coal gas of Gao Qing, and rough coal powder is made at high temperature
Coke breeze, after a part of reduction reaction, remaining part enters melt zone in the molten state, fine breeze in the top of rough coal powder,
It can adequately be reacted with miberal powder, with coke breeze reduction reaction occurs for miberal powder again after falling, and makes fine breeze and rough coal powder classified utilization；
4) high temperature reduction section reacts coke breeze and miberal powder using the heat that coke breeze burns, unreacted miberal powder, coke breeze melting
And high-temperature fusion section is fallen into, the temperature of reactant is adequately improved, and improve the temperature of melt zone, promotes melt zone
Contact reduction reaction.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is a kind of short route fused reduction iron-smelting system construction drawing of the invention；
Fig. 2 is another short route fused reduction iron-smelting system construction drawing of the invention；
Fig. 3 is 3 short route fused reduction iron-smelting system construction drawing of the embodiment of the present invention；
Wherein,
1, iron ore storehouse；2, iron ore crusher；3, muck storehouse, the 4, first flour mill；5, bag filter；6, mineral powder bin；
7, miberal powder batcher；8, run coal bin；9, coal dust crusher；10, broken coal storehouse；11, the second flour mill；12, rough coal separator；13,
Rough coal powder cabin；14, coal dust batcher；15, low-temperature reduction section；16, high temperature reduction section；17, burnt iron separator；18, semi-reduction iron
Powder cabin；19, coke breeze separator, 20, coke breeze L dipleg；21, iron powder L dipleg；；22, burner；23, slag exit；24, carbon iron
Melting and reducing section；25, molten iron exports；26, outlet；2-1, gas-solid separator；2-2, the first L dipleg；2-3, separation raw material cabin；
2-4, the 2nd L dipleg；1-1, fuel pulverizing plant；1-2, Iron Ore Powder preparation facilities；1-3, gas-solid separating device；The 3rd L of 1-4
Dipleg；1-5, the 4th L dipleg.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Below with reference to embodiment, the present invention is further described
Embodiment 1
As shown in Figure 1
A kind of short route fused reduction iron-smelting system, including fuel pulverizing plant 1-1, Iron Ore Powder preparation facilities 1-2, iron ore
Powder direct-reduction and coke breeze preparation facilities, gas-solid separating device 1-3；Iron Ore Powder direct-reduction is bottom phase with coke breeze preparation facilities
Logical U-shaped structure, two sides are respectively low-temperature reduction section 15, high temperature reduction section 16, and bottom is melting and reducing section 24, the coal dust system
Standby device 1-1, Iron Ore Powder preparation facilities 1-2 are connect with 15 middle part of low-temperature reduction section, bottom respectively, low-temperature reduction section 15 and gas
Solid separation device 1-3 connection, gas-solid separating device 1-3 are connect with the top burner 22 of high temperature reduction section 16, middle part respectively.
Embodiment 2
As shown in Figure 2
A kind of short route fused reduction iron-smelting system, including fuel pulverizing plant 1-1, Iron Ore Powder preparation facilities 1-2, iron ore
Powder direct-reduction and coke breeze preparation facilities, gas-solid separating device 1-3；Iron Ore Powder direct-reduction is bottom phase with coke breeze preparation facilities
Logical U-shaped structure, two sides are respectively low-temperature reduction section 15, high temperature reduction section 16, and bottom is melting and reducing section 24, the coal dust system
Standby device 1-1, Iron Ore Powder preparation facilities 1-2 are connect with 15 middle part of low-temperature reduction section, bottom respectively, low-temperature reduction section 15 and gas
Solid separation device 1-3 connection, gas-solid separating device 1-3 are connect with the top burner 22 of high temperature reduction section 16, middle part respectively.
Fuel pulverizing plant 1-1 includes mineral powder bin 6, miberal powder batcher 7 from top to bottom.
Iron Ore Powder preparation facilities 1-2 includes rough coal powder cabin 13 from top to bottom, coal dust batcher 14.
Gas-solid separating device 1-3 includes gas-solid separator 2-1, the first L dipleg 2-2, separation raw material cabin 2- from top to bottom
3, the 2nd L dipleg 2-4, the first L dipleg 2-2 are connect with the top burner 22 of high temperature reduction section 16, the 2nd L dipleg 2-4 and high
The middle part of warm reduction section 16 connects, and outlet 26 is arranged in the top of gas-solid separating device 1-3.
Melting and reducing section 24 is respectively slag exit 23, carbon iron melting and reducing section 24, molten iron outlet 25 from top to bottom.
Embodiment 3
As shown in Figure 3
A kind of short route fused reduction iron-smelting system, including fuel pulverizing plant 1-1, Iron Ore Powder preparation facilities 1-2, iron ore
Powder direct-reduction and coke breeze preparation facilities, gas-solid separating device 1-3；Iron Ore Powder direct-reduction is bottom phase with coke breeze preparation facilities
Logical U-shaped structure, two sides are respectively low-temperature reduction section 15, high temperature reduction section 16, and bottom is melting and reducing section 24, the coal dust system
Standby device 1-1, Iron Ore Powder preparation facilities 1-2 are connect with 15 middle part of low-temperature reduction section, bottom respectively, low-temperature reduction section 15 and gas
Solid separation device 1-3 connection, gas-solid separating device 1-3 are connect with the top burner 22 of high temperature reduction section 16, middle part respectively.
Iron Ore Powder preparation facilities includes sequentially connected iron ore storehouse 1, iron ore crusher 2, muck storehouse 3, the first flour mill
4, bag filter 5, mineral powder bin 6, miberal powder batcher 7.
The fuel pulverizing plant includes sequentially connected run coal bin 8, coal dust crusher 9, broken coal storehouse 10, the second flour mill
11, rough coal separator 12, rough coal powder cabin 13, coal dust batcher 14.
Rough coal separator 12 is connect with bag filter 5.
The feeding manner of Iron Ore Powder preparation facilities and fuel pulverizing plant be liquidate, one of the circle of contact or W type.
Gas-solid separating device includes sequentially connected burnt iron separator and coke breeze separator, burnt iron separator and height
The middle part of warm reduction section 16 connects, and coke breeze separator is connect with the top burner 22 of high temperature reduction section 16.
Burnt iron separator includes burnt iron separator 17, semi-reduction iron powder storehouse 18, iron powder L dipleg 21 from top to bottom.
Coke breeze separator includes coke breeze separator 19, coke breeze L dipleg 20 from top to bottom.
Outlet 31 is arranged in the top of coke breeze separator 19.
Miberal powder batcher and coal dust batcher are Weighing feeders.
Melting and reducing section is respectively slag exit 23, carbon iron melting and reducing section 24, molten iron outlet 25 from top to bottom.
Embodiment 4
The method that the system of above-mentioned short route fused reduction iron-smelting carries out reduction iron production, specific steps are as follows:
1) preparation of raw material
The process of raw coal and iron ore by broken, milling, separation respectively enters pulverized coal bin, mineral powder bin, spare；
2) low-temperature reduction
In low-temperature reduction section, in conjunction with the coal gas of high temperature effect that the conveying of high temperature reduction section comes, the coal dust gasification combustion of input
It burns and further generates coal gas, rough coal powder can be gasified totally to obtain coke breeze, and Iron Ore Powder is further under the action of reproducibility coal gas
Reduction reaction occurs, the coal gas of generation, coke breeze, semi-reduction Iron Ore Powder are by entering burnt iron separator at the top of low-temperature reduction section；
3) high temperature reduction
The coke breeze separated is sent into the burner at the top of high temperature reduction section by coke breeze separator, is being passed through combustion-supporting gas
Under body (air or oxygen rich gas) effect, gasification, and combustion reaction occurs, generates reproducibility coal gas；Burnt iron separator will be under separation
Come semi-reduction Iron Ore Powder be sent into high temperature reduction section in the middle part of, under the action of reproducibility coal gas and high temperature, semi-reduction Iron Ore Powder and
Coal gas, high temperature coke breeze further occurrence reduction reaction；
4) melting and reducing
Low-temperature reduction section, the complete miberal powder of high temperature reduction section unreacted and coke breeze under high temperature action in molten condition into
Entering melting and reducing section, concurrently raw reduction reaction has finally obtained molten iron.
The gasification of hypoxemia nonflame occurs for low-temperature reduction section coal dust.
The partial size of the rough coal powder of rough coal powder cabin is 0.1-1mm, and the partial size of the miberal powder of mineral powder bin is 0.1-1mm.
The temperature of low-temperature reduction section is 1400-1500 DEG C, and the temperature of high temperature reduction section is 1000-1100 DEG C.
Embodiment 5
The method that the system of above-mentioned short route fused reduction iron-smelting carries out reduction iron production, specific steps are as follows:
1) preparation of raw material
Raw coal and iron ore pass through broken, milling, the process of separation respectively enters rough coal powder cabin, mineral powder bin, rough coal separation
Device separates rough coal powder and fine breeze, and fine breeze enters bag filter；
2) low-temperature reduction
In low-temperature reduction section, in conjunction with the coal gas of high temperature effect that the conveying of high temperature reduction section comes, the coal dust gasification combustion of input
It burns and further generates coal gas, rough coal powder can be gasified totally to obtain coke breeze, and Iron Ore Powder is further under the action of reproducibility coal gas
Reduction reaction occurs, the coal gas of generation, coke breeze, semi-reduction Iron Ore Powder are by entering burnt iron separator at the top of low-temperature reduction section；
3) high temperature reduction
The coke breeze separated is sent into the burner at the top of high temperature reduction section by coke breeze separator, is being passed through combustion-supporting gas
Under body (air or oxygen rich gas) effect, gasification, and combustion reaction occurs, generates reproducibility coal gas；Burnt iron separator will be under separation
Come semi-reduction Iron Ore Powder be sent into high temperature reduction section in the middle part of, under the action of reproducibility coal gas and high temperature, semi-reduction Iron Ore Powder and
Coal gas, high temperature coke breeze further occurrence reduction reaction；
4) melting and reducing
Low-temperature reduction section, the complete miberal powder of high temperature reduction section unreacted and coke breeze under high temperature action in molten condition into
Entering melting and reducing section, concurrently raw reduction reaction has finally obtained molten iron.
The gasification of hypoxemia nonflame occurs for low-temperature reduction section coal dust.
The partial size of the rough coal powder of rough coal powder cabin is 1-3mm, and the partial size of the miberal powder of mineral powder bin is 1-3mm.
The temperature of low-temperature reduction section is 1100-1200 DEG C, and the temperature of high temperature reduction section is 1500-1700 DEG C.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (10)
1. a kind of short route fused reduction iron-smelting system, it is characterised in that: including fuel pulverizing plant, Iron Ore Powder preparation facilities,
Iron Ore Powder direct-reduction and coke breeze preparation facilities, gas-solid separating device；Iron Ore Powder direct-reduction is bottom with coke breeze preparation facilities
The U-shaped structure communicated, two sides are respectively low-temperature reduction section, high temperature reduction section, and bottom is melting and reducing section, the pulverized coal preparation dress
It sets, Iron Ore Powder preparation facilities is connect with low-temperature reduction section middle and lower part, bottom respectively, low-temperature reduction section and gas-solid separating device company
It connects, gas-solid separating device is connect with the top combustion device of high temperature reduction section, middle part respectively.
2. system according to claim 1, it is characterised in that: Iron Ore Powder preparation facilities includes sequentially connected iron ore
Storehouse, muck storehouse, the first flour mill, bag filter, mineral powder bin, miberal powder batcher.
3. system according to claim 2, it is characterised in that: the fuel pulverizing plant includes sequentially connected raw coal
Storehouse, crusher, broken coal storehouse, the second flour mill, rough coal separator, rough coal powder cabin, coal dust batcher；
Preferably, rough coal separator is connect with bag filter.
4. system according to claim 1, it is characterised in that: the charging side of Iron Ore Powder preparation facilities and fuel pulverizing plant
Formula be liquidate, one of the circle of contact and W type.
5. system according to claim 1, it is characterised in that: gas-solid separating device includes gas solid separation from top to bottom
Device, the first dipleg, separation raw material cabin, the second dipleg, the first dipleg are connect with the top combustion device of high temperature reduction section, the second material
Leg is connect with the middle part of high temperature reduction section, and the second outlet is arranged in the top of gas-solid separating device.
6. system according to claim 1, it is characterised in that: gas-solid separating device includes sequentially connected burnt iron separation dress
It sets and is connect with coke breeze separator, burnt iron separator with the middle part of high temperature reduction section, coke breeze separator and high temperature reduction section
Top combustion device connection；
Preferably, burnt iron separator includes burnt iron separator, semi-reduction iron powder storehouse, iron powder L dipleg from top to bottom.
7. system according to claim 6, it is characterised in that: coke breeze separator includes coke breeze separation from top to bottom
Device, coke breeze L dipleg；
Preferably, first discharge port is arranged in the top of coke breeze separator.
8. system according to claim 1, it is characterised in that: melting and reducing section is respectively slag exit, carbon from top to bottom
Iron melting and reducing section, molten iron outlet.
9. the method that the described in any item short route fused reduction iron-smelting systems of claim 1-8 carry out reduction iron production, feature
It is: specific steps are as follows:
1) preparation of raw material
The process of raw coal and iron ore by broken, milling, separation respectively enters pulverized coal bin, mineral powder bin, spare；
2) low-temperature reduction
In low-temperature reduction section, in conjunction with high temperature reduction section conveying come coal gas of high temperature effect, the coal dust gasification of input burn into
One step generates coal gas, and rough coal powder can be gasified totally to obtain coke breeze, Iron Ore Powder further occurrence under the action of reproducibility coal gas
Reduction reaction, the coal gas of generation, coke breeze, semi-reduction Iron Ore Powder are by entering burnt iron separator at the top of low-temperature reduction section；
3) high temperature reduction
The coke breeze separated is sent into the burner at the top of high temperature reduction section by coke breeze separator, is being passed through combustion-supporting gas
Under (air or oxygen rich gas) effect, gasification, and combustion reaction occurs, generates reproducibility coal gas；Burnt iron separator will separate
Semi-reduction Iron Ore Powder be sent into high temperature reduction section in the middle part of, under the action of reproducibility coal gas and high temperature, semi-reduction Iron Ore Powder and coal
Gas, high temperature coke breeze further occurrence reduction reaction；
4) melting and reducing
Low-temperature reduction section, the complete miberal powder of high temperature reduction section unreacted and coke breeze are molten in the entrance of molten condition under high temperature action
Melting reduction section, concurrently raw reduction reaction has finally obtained molten iron；
Preferably, coal dust being divided into rough coal powder and fine breeze in rough coal separator in step 1), fine breeze enters bag filter,
It is mixed with Iron Ore Powder, flux and sprays into burner hearth.
Preferably, the temperature of low-temperature reduction section is 1000-1200 DEG C, and the temperature of high temperature reduction section is 1400-1700 DEG C.
10. according to the method described in claim 9, it is characterized by: the partial size of the rough coal powder of rough coal powder cabin is 0.05-3mm, mine
The partial size of the miberal powder of powder cabin is 0.05-3mm.
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| CN201811303409.5A CN109321703B (en) | 2018-11-02 | 2018-11-02 | Short-process smelting reduction iron making system and method |
| PCT/CN2018/124111 WO2020087733A1 (en) | 2018-11-02 | 2018-12-27 | Short-process smelting reduction iron-making system and method |
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| CN201811303409.5A CN109321703B (en) | 2018-11-02 | 2018-11-02 | Short-process smelting reduction iron making system and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110578029A (en) * | 2019-09-25 | 2019-12-17 | 山东大学 | Two-section type descending entrained flow iron-making system and iron-making process |
| CN113025771A (en) * | 2021-03-05 | 2021-06-25 | 山东大学 | Grate type direct reduced iron production system and method for sintering machine |
| CN115261542A (en) * | 2022-07-11 | 2022-11-01 | 山东祥桓环境科技有限公司 | Circulating fluidized bed direct reduction method and process for short-process smelting of coal powder and mineral powder |
| CN115710610A (en) * | 2022-10-31 | 2023-02-24 | 山东祥桓环境科技有限公司 | Hydrogen-rich smelting device and process based on coal powder and iron ore powder |
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| Publication number | Publication date |
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| CN109321703B (en) | 2023-09-29 |
| WO2020087733A1 (en) | 2020-05-07 |
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