CN1099418A - Method and device of reduction iron-smelting for cold-coagulated carboniferous briquet - Google Patents
Method and device of reduction iron-smelting for cold-coagulated carboniferous briquet Download PDFInfo
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- CN1099418A CN1099418A CN 94107925 CN94107925A CN1099418A CN 1099418 A CN1099418 A CN 1099418A CN 94107925 CN94107925 CN 94107925 CN 94107925 A CN94107925 A CN 94107925A CN 1099418 A CN1099418 A CN 1099418A
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Abstract
The characteristics of the device of this invention are:(1) at least one jet orifice for oxygen is added on the upper port of existing terminal reduction furnace. (2) a burner is added which is installed between high temp. deduster and ring enclosed wind pipe of pre-reduction furnace. The characteristics of process are:(1) cold concreted spherical briquette which contains 5-20 percent fixed carbon is used. (2) the upper part temp. of terminal reduction furnace is controlled at 1300-1800 deg.C, secondary combustion rate is controlled at a range of 20-70 percent. (3) the temp. of coal gas entered into high temp. dedaster is controlled at 1050-800 deg.C. (4) the metallization rate of pre-reduction furnace is greater than 20 percent.
Description
The invention belongs to the melting and reducing field, be specially adapted to adopt smelting reduction process to produce molten iron with carbon containing cold consolidated pelletizing.
In the prior art, the technology of producing the molten iron success with coal is the COREX method of VAI in exploitation in 1977.Be characterized in acid pellet or rich lump ore are packed in the shaft furnace, obtain degree of metalization and reach prereduced burden material more than 92%.Prereduced burden after will reducing is then packed into and is melted in the fusion reducing furnace and reduction eventually.In end reducing furnace, emit molten iron at last, reclaim coal gas from the pre-reducing furnace furnace roof.The COREX method uses acid pellet or lump ore to make raw material, and its reductibility is relatively poor, can not accept high prereduction gas temperature.So its prereduction equipment is very huge, production efficiency is low.
The object of the present invention is to provide a kind of device and method of improved reduction iron-smelting for cold-coagulated carboniferous briquet, it is the production efficiency height not only, the heat utilization efficiency height, and also equipment is simple.
In order to achieve the above object, reduction iron-smelting for cold-coagulated carboniferous briquet device of the present invention, it comprises pre-reducing furnace, described pre-reducing furnace has last opening for feed and lower discharge port, also have a plurality of air ports that the annular that is positioned at the middle and lower part is enclosed airduct and is attached thereto, also has end reducing furnace under the pre-reducing furnace of being positioned at, described end reducing furnace has last opening for feed, its top has at least one coal and flux to add pipe, there is at least one oxygen spout the middle and upper part, there are a plurality of side oxygen coal spouts the middle and lower part, the bottom has at least one to put Tie Kou and a slag notch, also is serially connected with hot precipitator on the middle and lower part of described pre-reducing furnace annular is enclosed gas line between airduct and the end reducing furnace top gas exit.Be serially connected with fly-ash separator on the gas line after the gas exit of described pre-reducing furnace top, after this fly-ash separator on the gas line and be connected to coal gas circulation booster fan between the end reducing furnace gas exit, its characteristics are: this device also has at least one oxygen spout, and described oxygen spout is positioned at the angle of described end reducing furnace middle and upper part and its medullary ray and horizontal plane 10 °～60 ° scopes; Also have a burner, described burner is serially connected in described hot precipitator and the pre-reducing furnace annular is enclosed between the airduct.
Utilize the method for device ironmaking of the present invention, its characteristics are: this method uses the cold-bonded carbonic pellet that contains fixed carbon 5～20% to make raw material; This method control end reducing furnace upper temp is in 1300～1800 ℃ of scopes, and post-combustion rate is in 20%～70% scope; Adopt this method, metallization＞20% that enters the hot prereduced burden material of end reducing furnace gets final product; Entering described pre-reducing furnace and annular in this method encloses the link reducing gas temperature in exit, air port of airduct and determined by following method: i.e. the carbonaceous pelletizing of Shi Yonging, three balls are piled up together, at 60%CO+40%CO
2Under the atmosphere, at 1kg/cm
2Under the pressure, the beginning bonding temp of reductase 12 hour (according to raw material not herewith temperature between 900 °～1100 °), the described reducing gas temperature in pre-reducing furnace air port that enters is in-50～+ 50 ℃ scope of described beginning bonding temp.
When the gas temperature in entering the pre-reducing furnace air port does not reach the temperature of above-mentioned requirements, send into oxygen-containing gas at burner internal combustion part coal gas to being connected on high-temperature gas duster and the annular burner that encloses between the airduct, the gas temperature in the pipeline is brought up to the temperature of requirement.
This method is blended into from the cooled coal gas of pre-reducing furnace top through dedusting and pressurization at end reducing furnace gas exit place.The cooled coal gas amount that is blended into by control makes the gas temperature in the gas line that enters before the hot precipitator drop to 1050 ℃～800 °.
Technical process of the present invention is: cold-bonded carbonic pellet ore deposit opening for feed from the pre-reducing furnace top that will contain fixed carbon 5～20% adds the pre-reducing furnace, from the coal gas of high temperature of end reducing furnace with enclose airduct and the air port sprays in the pre-reducing furnace from the mutually mixed high temperature mixed gas of the circulation cooled coal gas at pre-reducing furnace top from the pre-reducing furnace middle and lower part through annular, the temperature of gas that sprays in the pre-reducing furnace can be determined by the following method: can measure three balls of carbonaceous pelletizing by experiment and pile up together, at 60%CO+40%CO
2Under the atmosphere, at 1kg/cm
2Under the pressure, reductase 12 hour bonding temperature of beginning, (according to raw material not herewith temperature in 900 ℃～1100 ℃ scopes), in-50 ℃～+ 50 ℃ scopes of described beginning bonding temp, determine to enter the prereduction temperature degree in prereduction air port.
If the coal gas that enters in the pre-reducing furnace air port does not reach the temperature of described requirement, enclose in the burner between airduct and the hot precipitator spray oxygen-containing gas a part of coal gas that burns to being serially connected in the pre-reducing furnace annular, gas temperature is brought up to the level of requirement.
Pre-reducing furnace can be divided into four districts in the working hour, and shaft top is heat exchange zone, and the middle part is the indirect reduction reaction zone, and the shaft middle and lower part is to being the direct reduction reactor district more than the air port, and the air port is following to be direct reduction cooling zone.Carbon containing cold consolidated pelletizing is after through four districts in the pre-reducing furnace, discharge from the lower discharge port of pre-reducing furnace, through the opening for feed of charging system from end reducing furnace top, enter in the end reducing furnace, flux and the coal that replenishes are packed into from the coal or the flux adding pipe on end reducing furnace top.The oxygen that the end reducing furnace burning is required is supplied with by oxygen spout that is located at the end reducing furnace middle and upper part and the side oxygen coal spout that is located at the middle and lower part.Can divide five districts during end reducing furnace work, be followed successively by secondary combustion zone, ore-coke layer district, coke bed district, slag blanket district and iron floor district from top to bottom, wherein, the secondary combustion zone mainly is the CO gas that burning is blown up from the bottom, and post-combustion rate is controlled between 20%～70%, and temperature is controlled at 1300 ℃～1800 ℃, the ore-coke layer district, be the smelting reduction district, in this district, carbonaceous pelletizing is finished reduction eventually and fusing.
Put the iron mouth in the end reducing furnace bottom and slag notch is emitted molten iron and slag, 1300 ℃～1800 ℃ the coal gas of high temperature of discharging on end reducing furnace top, the coal gas of high temperature exit with from the cold circulating gas hybrid cooling of pre-reducing furnace furnace roof, be blended into amount temperature by the control cooled coal gas and can reduce to 1050 ℃～800 ℃, enter the hot precipitator dedusting then.
The coal gas that comes out from the pre-reducing furnace furnace roof is after dedusting, and a part is after the booster fan pressurization, and after delivering to gas exit place, end reducing furnace top and coal gas of high temperature mixing, the confession pre-reducing furnace recycles, and another part is sent to other user.Pre-reducing furnace stock gas internal circulating load will guarantee that the end reducing furnace furnace top gas temperature drops to 1050 ℃～800 ℃.
The present invention compared with prior art, its advantage is:
(1) improved the working efficiency of pre-reducing furnace.
Be connected in series a burner between the airduct owing to enclosing in described hot precipitator and described pre-reducing furnace annular, a part of coal gas improves the gas temperature that enters pre-reducing furnace in order to burn, therefore, pre-reducing furnace not only has the indirect reduction reaction, also have the fast direct reducing reaction, improved the working efficiency of pre-reducing furnace.
(2) improve the interior post-combustion rate of whole device, improved thermo-efficiency.
End reducing furnace top has at least one oxygen spout, and has increased foregoing burner, has increased system-wide post-combustion rate, makes the total system post-combustion rate reach 30%～80%, has improved system-wide thermo-efficiency.
(3) whole reduction rate and burn-off rate have been accelerated.
Because the end reducing furnace top of this device has at least one oxygen spout, to end reducing furnace upper space and charge level spray oxygen, form the combustion zone that a temperature can reach 1300 ℃～1800 ℃ of secondaries at the end reducing furnace upper space, enter the prereduction pellet in the end reducing furnace like this, heated simultaneously from coke bed position side oxygen coal spout combustion heat air-flow by combustion zone, top and bottom, be accelerated whole reduction rate and burn-off rate.
(4) the present invention's degree of metalization of supplying with the prereduced burden material of end reducing furnace can be loosened to＞20%, and the COREX method of VAI exploitation, the degree of metalization that requires prereduced burden material is more than 92%.
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of reduction iron-smelting for cold-coagulated carboniferous briquet device of the present invention.
Among Fig. 1,1 is the upper inlet of pre-reducing furnace, and 2 is pre-reducing furnace, 3 enclose airduct for the prereduction annular, 4 is the pre-reducing furnace lower discharge port, and 5 is the end reducing furnace opening for feed, and 6 is end reducing furnace, 7 is the oxygen spout, 8 is side oxygen coal spout, and 9 is iron notch, and 10 is slag notch, 11 add inlet for coal and flux, 12 is hot precipitator, and 13 is burner, and 14 is booster fan, 15 is fly-ash separator, 16 is the pre-reducing furnace air port, and 17 is pre-reducing furnace top gas exit, and 18 is end reducing furnace top gas exit, 19 is the oxygen cathete of burner, and 20 is the coal gas delivery port.
Claims (3)
1, a kind of reduction iron-smelting for cold-coagulated carboniferous briquet device, it comprises pre-reducing furnace (2), described pre-reducing furnace (2) has last opening for feed (1) and lower discharge port (4), and described pre-reducing furnace (2) has a plurality of air ports (16) that the annular that is positioned at the middle and lower part is enclosed airduct (3) and is attached thereto; Also has the end reducing furnace (6) that is positioned at pre-reducing furnace (2) below, described end reducing furnace (6) has last opening for feed (5), the top of described end reducing furnace (6) has at least one coal and flux to add pipe (11), there are a plurality of side oxygen coal spouts (8) middle and lower part, the bottom has at least one to put an iron mouth (9) and a slag notch (10), on enclosing gas line between airduct (3) and end reducing furnace (6) top, the middle and lower part annular of described pre-reducing furnace (2) also is serially connected with hot precipitator (12), on described pre-reducing furnace (2) top gas exit (17) gas line afterwards, be serially connected with fly-ash separator (15), be connected to coal gas circulation booster fan (14) on this fly-ash separator (15) gas line afterwards and between end reducing furnace (6) the top gas exit (18), it is characterized in that:
[1] this reduction iron-smelting for cold-coagulated carboniferous briquet device has at least one oxygen spout (7), and described oxygen spout (7) is positioned at described end reducing furnace (6) middle and upper part and its medullary ray and horizontal plane angle 10 °～60 ° scopes.
[2] this reduction iron-smelting for cold-coagulated carboniferous briquet device also has a burner (13), and described burner (13) is serially connected in described hot precipitator (12) and described pre-reducing furnace annular is enclosed between the airduct (3).
2, a kind of method of utilizing the described device ironmaking of claim 1 is characterized in that:
[1] this method uses the carbon containing cold consolidated pelletizing that contains fixed carbon 5～20% to make raw material.
[2] this method utilizes oxygen spout (7) control end reducing furnace (6) post-combustion rate in 20～70% scopes, and control end reducing furnace (6) upper temp is in 1300～1800 ℃ of scopes.
[3] this method is located to be blended into from the cooled coal gas of pre-reducing furnace (2) top through dedusting and pressurization at end reducing furnace (6) gas exit (18), and the cooled coal gas amount that is blended into by control makes the gas temperature that enters in the preceding gas line of hot precipitator (12) drop to 1050 ℃～800 ℃.
[4] the reducing gas temperature that enters exit, described pre-reducing furnace air port (16) in this method is determined by following method, i.e. the carbonaceous pelletizing of Shi Yonging is at 60%CO+40%CO
2Under the atmosphere, three balls are piled up together, at 1mg/cm
2Under the pressure, a reductase 12 hour bonding temperature of beginning, the described reducing gas temperature in exit, pre-reducing furnace air port (16) that enters is in-50～+ 50 ℃ of scopes of described beginning bonding temp.
[5] adopt this method, degree of metalization＞20% that enters the hot prereduced burden material of end reducing furnace (6) gets final product.
3, method according to claim 2, when the temperature in entering pre-reducing furnace (2) air port does not reach claim 2 and requires, enclose burner (13) between the airduct (3) and send into oxygen-containing gas to being connected on high-temperature gas duster (12) and annular, the gas temperature in the pipeline is brought up to the temperature of requirement at burner (13) internal combustion part coal gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94107925 CN1099418A (en) | 1994-08-02 | 1994-08-02 | Method and device of reduction iron-smelting for cold-coagulated carboniferous briquet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94107925 CN1099418A (en) | 1994-08-02 | 1994-08-02 | Method and device of reduction iron-smelting for cold-coagulated carboniferous briquet |
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| CN1099418A true CN1099418A (en) | 1995-03-01 |
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| CN 94107925 Pending CN1099418A (en) | 1994-08-02 | 1994-08-02 | Method and device of reduction iron-smelting for cold-coagulated carboniferous briquet |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1059706C (en) * | 1996-09-28 | 2000-12-20 | 北京科技大学 | Gas circulative reduction smelting process for carbon containing pellets |
| WO2010072043A1 (en) * | 2008-12-22 | 2010-07-01 | 莱芜钢铁集团有限公司 | Smelting vessel, steel making plant and steel production method |
| CN107354259A (en) * | 2017-08-03 | 2017-11-17 | 江苏省冶金设计院有限公司 | A kind of coal-based direct reduction shaft furnace and the method smelted using the shaft furnace |
| CN108754057A (en) * | 2018-06-20 | 2018-11-06 | 华北理工大学 | A kind of device and its application for detaching prereduction ferrous material |
-
1994
- 1994-08-02 CN CN 94107925 patent/CN1099418A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1059706C (en) * | 1996-09-28 | 2000-12-20 | 北京科技大学 | Gas circulative reduction smelting process for carbon containing pellets |
| WO2010072043A1 (en) * | 2008-12-22 | 2010-07-01 | 莱芜钢铁集团有限公司 | Smelting vessel, steel making plant and steel production method |
| CN107354259A (en) * | 2017-08-03 | 2017-11-17 | 江苏省冶金设计院有限公司 | A kind of coal-based direct reduction shaft furnace and the method smelted using the shaft furnace |
| CN108754057A (en) * | 2018-06-20 | 2018-11-06 | 华北理工大学 | A kind of device and its application for detaching prereduction ferrous material |
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