CN105420436A - Iron-making device and iron-making process using same - Google Patents
Iron-making device and iron-making process using same Download PDFInfo
- Publication number
- CN105420436A CN105420436A CN201510748511.6A CN201510748511A CN105420436A CN 105420436 A CN105420436 A CN 105420436A CN 201510748511 A CN201510748511 A CN 201510748511A CN 105420436 A CN105420436 A CN 105420436A
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- iron
- solid charge
- mixing zone
- zone
- spray gun
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention belongs to the technical field of metallurgical equipment, in particular to an iron-making device and an iron-making process using the same. The iron-making device comprises a discharging zone, a solid charge zone, a mixing zone (namely a solid charge and slag mixing zone) and a precipitation separation zone successively from top to bottom, wherein a primary air spray gun is arranged on the side wall of the mixing zone, and a secondary air spray gun is arranged on the side wall of the solid charge zone; a slag outlet and an iron outlet are formed in the side wall of the precipitation separation zone. The iron-making process comprises the following steps that melting is carried out in the mixing zone; primary air is injected into the mixing zone to aggravate the combustion and melting of charge blocks, and carbon monoxide gas is produced to reduce iron oxide; the surplus air ascends to the slag surface to violently burn with carbon on the molten surface, a lot of heat is released, and the melting temperature is ensured; secondary air is injected to the solid charge zone, so that the combustion ratio of carbon monoxide gas of furnace gas of the solid charge zone is greater than or equal to 95 percent, and the heat value of carbon is increased.
Description
Technical field
The invention belongs to technical field of metallurgical equipment, particularly a kind of non-blast furnace ironmaking device, and use the iron-smelting process of this iron-smelting device.
Background technology
Current blast furnace remains the main force of metallurgy industry ironmaking, and its advantage is that the furnace life of blast furnace is long, production capacity is large, energy consumption is low, it is simple and easy to operate.But because blast furnace process is long, capital cost is high, equipment is complicated, environmental pollution is serious.Coke resource is non-renewable, when market energy shortage, increasingly competitive, the sight of people turns to the new non-blast furnace ironmaking technique of exploitation and ironmaking equipment gradually.
Without the target that burnt low stain is non-blast furnace ironmaking novel process.Non-blast furnace ironmaking technique, can be divided into " direct-reduction process " and " smelting reduction process " two large class.Smelting reduction process is as the leading research direction of non-blast furnace ironmaking, and except COREX stove realizes except scale production, other non-blast furnace ironmaking technique all also there is no the state of the art of scale production.
Summary of the invention
The present invention proposes a kind of non-blast furnace ironmaking device and iron-smelting process.Iron-smelting device comprises discharging area, solid charge district, mixing zone (mixing zone refers to: the mixing zone of solid charge and slag) from top to bottom, and depositing separation area.Mixing zone sidewall is provided with First air spray gun, and in solid charge district, sidewall is provided with secondary-wind spray gun, and depositing separation area sidewall is provided with slag notch and iron notch.
Iron-smelting device in the present invention carries out First air winding-up and secondary air winding-up in smelting process, First air spray gun used and secondary-wind spray gun can be one or more, can carry out according to actual needs selecting suitable quantity, spray gun is used for jetting oxygen rich gas or air in stove.In order to realize the circulation of above-mentioned furnace gas and heat, be partly or entirely communicated with between discharging area, solid charge district, mixing zone, depositing separation area, making to react the high-temperature furnace gas produced can pass through, and heat transmission is more abundant.
In the present invention, the shape of iron-smelting device can be selected according to furnace charge quantity, size and character, and preferably the cross section in this solid charge district becomes large from top to bottom gradually, is convenient to the conveying of furnace charge and the transmission of heat.
In the present invention, secondary-wind spray gun is jetted to solid charge district, makes rate of combustion >=95% of the CO (carbon monoxide converter) gas in solid charge district.
In the present invention, First air spray gun is jetted to mixing zone, and furnace charge is rolled.
In the present invention, described iron-smelting device forms existing molten point stove, shaft furnace, stove of turning, smelting furnace or pipe furnace transformation.
Present invention also offers a kind of iron smelting method, iron-smelting device is entered from discharging area through pretreated furnace charge block, at solid charge, district completes heating, and reach the soft heat stage, the high-temperature furnace gas that combustion reactions produces is in the process by solid charge district, progressively consume the heat in iron-smelting device, reduce its temperature.Enter behind mixing zone until solid charge, wrapped up by hot slag, constantly softening fusing.After fusing, a large amount of carbon discharges because of the decomposition of solid state, and be floated to slag surface, iron and the slag of melting enter depositing separation area and be separated, then discharges from iron notch and slag notch respectively.
After First air winding-up enters mixing zone, part generates reducing gas carbon monoxide, reacts with the oxide compound of remaining iron.A large amount of oxygen is combined with carbon, vigorous combustion occurs and generates carbonic acid gas, discharge a large amount of heats.The reaction that mixing zone occurs is complicated and hockets, and the intensity of once jetting is determined by air quantity, oxygen enrichment ratio, and the pressure of once jetting and gun inlets go deep into the height correlation of bath surface.Secondary air winding-up is the furnace gas atmosphere controlling solid charge district, a large amount of CO (carbon monoxide converter) gas is allowed to burn, the rate of combustion controlling CO (carbon monoxide converter) gas in furnace gas reaches 70% ~ 95%, preferably only retains a small amount of (concentration of carbon monoxide is approximately 1% ~ 5%) CO (carbon monoxide converter) gas, to improve the calorific value of carbon.
Preferably, enter iron-smelting device through pretreated furnace charge block with 800 ~ 1200 DEG C of high temperature, after solid charge district completes and is heated to 1300-1500 DEG C, reach the soft heat stage.
Preferably, after solid charge fusing, under the winding-up effect of First air, the carbon that mixing zone is separated out produces vigorous combustion at solid and slag boundary surface layer, and furnace temperature is not less than 1500 DEG C, preferably between 1500 ~ 1800 DEG C.
Preferably, 1300-1450 DEG C is controlled in depositing separation area temperature.
Iron-smelting device of the present invention does not make stock column with coke, and First air winding-up at solid charge place, therefore neither be different from blast furnace; Iron-smelting device of the present invention has a solid charge district, is different from the bath smelting furnace of melting and reducing, because bath smelting furnace does not have stock column.
The present invention is reasonably arranged region each in stove and spray gun, completes the smelting to iron, and equipment is simple, and technique is easy to operate, greatly reduces extraneous energy expenditure, have the technique effect of energy-saving and emission-reduction owing to making full use of reaction heat.
Accompanying drawing explanation
Fig. 1 is the structural representation of iron-smelting device of the present invention
In figure, 1. depositing separation area, 2. First air spray gun, 3. mixing zone, 4. secondary-wind spray gun, 5. solid charge district, 6. iron-smelting device, 7. iron notch, 8. slag notch, 9. discharging area.
Embodiment
Under normal operating conditions, iron-smelting device is divided into 1 depositing separation area, 3 mixing zones, 5 solid charge districts.Iron-smelting device 6 is entered from discharging area 9 by the furnace charge block that heats or pelletizing, more descending to the bottom in solid charge district 5 from the top layer in solid charge district 5, constantly absorb by the heat of the high-temperature furnace gas that mixing zone rises, until be warming up to fusing point.The high-temperature furnace gas that combustion reactions produces, in the process by solid charge district 5, progressively consumes the heat in iron-smelting device 6, reduces its temperature.Enter behind mixing zone 3 until solid charge, wrapped up by hot slag, constantly softening fusing.After fusing, a large amount of carbon discharges because of the decomposition of solid state, and be floated to slag surface, iron and the slag of melting enter depositing separation area.
After First air winding-up enters mixing zone 3, part generates reducing gas carbon monoxide, and react with the oxide compound of remaining iron, a large amount of oxygen is combined with carbon, vigorous combustion occurs and generates carbonic acid gas, discharge a large amount of heats.Secondary air winding-up is the furnace gas atmosphere controlling solid charge district 5, allows a large amount of CO (carbon monoxide converter) gas burn, and only retains a small amount of (concentration of carbon monoxide is approximately 1% ~ 5%) CO (carbon monoxide converter) gas, to improve the calorific value of carbon.
The molten iron of fusing enters depositing separation area with slag and is separated, then discharges from iron notch 7 and slag notch 8 respectively.
The explanation of above embodiment is just for helping method and the core concept thereof of understanding this programme.It should be pointed out that under the prerequisite not departing from this programme principle, can also carry out some improvement to this programme, these improvement fall in the protection domain of this programme claim too.
Claims (8)
1. an iron-smelting device, comprise discharging area, solid charge district, mixing zone and depositing separation area from top to bottom successively, it is characterized in that: mixing zone sidewall is provided with First air spray gun, in solid charge district, sidewall is provided with secondary-wind spray gun, and depositing separation area sidewall is provided with slag notch and iron notch.
2. iron-smelting device according to claim 1, is characterized in that: described First air spray gun and secondary-wind spray gun winding-up oxygen rich gas or air.
3. iron-smelting device according to claim 1, is characterized in that: described First air spray gun and secondary-wind spray gun are one or more.
4. iron-smelting device according to claim 1, is characterized in that: be partly or entirely communicated with between discharging area, solid charge district, mixing zone, depositing separation area.
5. iron-smelting device according to claim 1, is characterized in that: the cross section in solid charge district becomes large from top to bottom gradually.
6. use an iron-smelting process for the iron-smelting device described in any one of claim 1-5, it comprises the following steps:
(1) furnace charge block enters iron-smelting device with 800 ~ 1200 DEG C from discharging area, completes being heated to 1300-1500 DEG C, and reach the soft heat stage in solid charge district;
(2) enter behind mixing zone until solid charge, under the winding-up effect of First air, the carbon that mixing zone is separated out produces vigorous combustion at solid and slag boundary surface layer, and furnace temperature is not less than 1500 DEG C;
(3) 1300-1450 DEG C is controlled in depositing separation area temperature;
(4) molten iron melted and slag enter depositing separation area and are separated, then discharge from iron notch and slag notch respectively.
7. iron-smelting process according to claim 6, is characterized in that: the secondary air winding-up also comprising solid charge district, the rate of combustion controlling CO (carbon monoxide converter) gas in furnace gas reaches 70% ~ 95%.
8. iron-smelting process according to claim 7, is characterized in that: fusing, reduction and oxidising process complete in mixing zone, and temperature is between 1500 ~ 1800 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510748511.6A CN105420436A (en) | 2015-11-07 | 2015-11-07 | Iron-making device and iron-making process using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510748511.6A CN105420436A (en) | 2015-11-07 | 2015-11-07 | Iron-making device and iron-making process using same |
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| CN105420436A true CN105420436A (en) | 2016-03-23 |
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| CN201510748511.6A Pending CN105420436A (en) | 2015-11-07 | 2015-11-07 | Iron-making device and iron-making process using same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105783020A (en) * | 2016-04-21 | 2016-07-20 | 成都华西堂环保科技有限公司 | Oxygen-rich low-nitrate combustion and denitration process of coal-fired boiler |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104928428A (en) * | 2015-04-27 | 2015-09-23 | 钢铁研究总院 | Pulverized coal melt separation and recovery method for low-grade iron resources |
-
2015
- 2015-11-07 CN CN201510748511.6A patent/CN105420436A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104928428A (en) * | 2015-04-27 | 2015-09-23 | 钢铁研究总院 | Pulverized coal melt separation and recovery method for low-grade iron resources |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105783020A (en) * | 2016-04-21 | 2016-07-20 | 成都华西堂环保科技有限公司 | Oxygen-rich low-nitrate combustion and denitration process of coal-fired boiler |
| CN105783020B (en) * | 2016-04-21 | 2018-07-27 | 成都华西堂环保科技有限公司 | A kind of oxygen-enriched low nitrogen burning denitrating technique of coal-burning boiler |
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Application publication date: 20160323 |
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