CN106086278A - A kind of molten point of stove reduction system and method for injecting oxygen - Google Patents
A kind of molten point of stove reduction system and method for injecting oxygen Download PDFInfo
- Publication number
- CN106086278A CN106086278A CN201610637901.0A CN201610637901A CN106086278A CN 106086278 A CN106086278 A CN 106086278A CN 201610637901 A CN201610637901 A CN 201610637901A CN 106086278 A CN106086278 A CN 106086278A
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- Prior art keywords
- shaft furnace
- stove
- reduction shaft
- breeze
- reduction
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Classifications
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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
- C21B13/023—Making spongy iron or liquid steel, by direct processes in shaft furnaces wherein iron or steel is obtained in a molten state
-
- 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
-
- 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 molten point of stove reduction system and method for a kind of injecting oxygen.Described system includes reduction shaft furnace, molten point of stove and oxygen rifle, wherein, described reduction shaft furnace includes breeze and flux feeding mouth, coal dust feeding mouth, feed opening, smoke inlet, is provided with the baffle plate of adjustable inclination in the burner hearth of described reduction shaft furnace, and it is hollow structure with the rotating shaft supported；A described molten point stove includes feeding mouth, exhanst gas outlet and discharging opening, and described feeding mouth connects the feed opening of described reduction shaft furnace, and described exhanst gas outlet connects the smoke inlet of described reduction shaft furnace；The lance head of described oxygen rifle is located in described molten point of stove, and described oxygen rifle stretches in described molten point of stove from the furnace roof of described molten point of stove.Molten point of stove reduction system and method for the injecting oxygen of the present invention, by arranging the baffle plate of adjustable inclination to control speed and the residence time of breeze decline, it is ensured that the reduction effect of breeze in described reduction shaft furnace.
Description
Technical field
Present invention relates generally to a kind of molten point of stove reduction system and method, be specifically related to molten point of stove of a kind of injecting oxygen also
Original system and method.
Background technology
Non-blast furnace ironmaking is a direction of Iron & Steel Development, and main purpose is to realize low cost smelting and difficult reduced ore
Utilization, and for realize cleanly production.In recent years molten point of technology of coal-base fusing reduction and direct-reduction+electric furnace with
And the molten point technology of coal-based direct reduction+gas furnace progressively develops into for one of iron-smelting process technology, this technique had with coal generation
Burnt, reduction temperature high, the duration of heat is short, energy consumption is low, environmental pollution is little and the feature such as reduced investment, meets china natural resources, the energy
Current situation, becomes one of focus of iron and steel circle research the most both at home and abroad.Melting and reducing and direct-reduction technique do not use coke,
It is not required to build coke oven and chemical industry facility, sintering facility can not be built when using lump ore and part pellet, decrease more polluter,
In order to realize, steel plant's cleaning produces, energy-conserving and environment-protective create condition.
Prior art one is COREX (smelting iron the ultimate aim as it with coal) technology.The agent set of this technology is
Reduction shaft furnace and melting gasification furnace.By joining in shaft furnace by lump ore and pelletizing, reducing gas is utilized ore reduction to be arrived
The metallized pellet of more than 90%, then feed them into melting gasification furnace and reduce further and melt, final production goes out qualified molten iron.
The shortcoming of this technology is to directly utilize powder, needs first powder to be pressed into pelletizing recycling, or directly utilize lump ore, this skill
What art was difficult in smelting process in regulation raw material joins charcoal ratio, it is impossible to accurately control the reduction effect of Ore.
Prior art two is FINEX (direct fine ore and non-coking coal dust smelting molten iron) technology, is at COREX technology base
The new technology grown up further on plinth, COREX technology uses lump ore, pelletizing, and FINEX technology all uses fine ore.FINEX
Technical matters replaces the reduction shaft furnace in COREX technique with Finmet (the hot wafering direct-reduction iron processes) technique of 4 grades of fluid beds,
Becoming briquette iron by hot molding to add melting gasification furnace with fluid bed reduction fine ore, briquetting, specially fine ore and limestone, dolomite etc. melts
Agent is put into a series of fluidized-bed reactor together.Fine ore in a downward direction by four reactors, in this course by
Heating, and it is reduced into DRI by the reducibility gas produced by coal gasification of reverse flow therewith.Anti-from last
The DRI answering device heat out is compressed into hot-pressed iron compact (HCI:hot compacted iron), and hot-pressed iron compact is transported afterwards
To fusion and gasification furnace roof, put into melting gasification furnace, be melted.Last out molten iron and slag.
The shortcoming of prior art two is: fluid bed needs level Four to reduce, and structure is complicated；Briquetting is needed before entering molten point of stove
Generate hot pressing ball and enter back into molten point stove.
Therefore, in shaft furnace, complete direct reduction reactor to be able to directly utilize the powders such as breeze, coal dust, pulverized limestone, and
Simplify multi-stage fluidized bed process, and transporting velocity and the residence time of breeze can be controlled, it is ensured that the reduction effect of breeze, having must
A kind of molten point of new stove reduction system and method is proposed.
Summary of the invention
It is an object of the invention to provide molten point of stove reduction system and method for a kind of injecting oxygen so that this technique can
Directly utilize the powders such as breeze, coal dust, pulverized limestone in shaft furnace, complete direct reduction reactor, and simplify multi-stage fluidized bed process,
High-temperature-resistant structure in guarantee reduction shaft furnace, and transporting velocity and the residence time of breeze can be controlled, to ensure going back of breeze
Former effect.
The invention provides molten point of stove also original system of a kind of injecting oxygen, described system includes reduction shaft furnace, molten point of stove
With oxygen rifle, wherein, described reduction shaft furnace includes breeze and flux feeding mouth, coal dust feeding mouth, feed opening, smoke inlet, described
The top of described reduction shaft furnace is located at by breeze and flux feeding mouth and described coal dust feeding mouth, and described feed opening and smoke inlet set
Bottom in described reduction shaft furnace；Being provided with the baffle plate of adjustable inclination in the burner hearth of described reduction shaft furnace, described baffle plate is located at institute
State under breeze and flux feeding mouth, on described feed opening and described smoke inlet；Described baffle plate and described reduction shaft furnace
Inwall leaves gap, and described baffle plate is disposed with aperture；Described baffle plate by through described reduction shaft furnace furnace wall rotating shaft support in
On described reduction shaft furnace；A described molten point stove includes feeding mouth, exhanst gas outlet and discharging opening, and described feeding mouth connects described reduction vertical
The feed opening of stove, described exhanst gas outlet connects the smoke inlet of described reduction shaft furnace；The lance head of described oxygen rifle is located at described molten
In dividing stove, described oxygen rifle stretches in described molten point of stove from the furnace roof of described molten point of stove.
Above-mentioned system, is sequentially provided with multiple gear with described inclination angle from top to bottom in the burner hearth of described reduction shaft furnace
Plate, the vertical centrage of the most described reduction shaft furnace in inclination angle of adjacent described baffle plate is arranged symmetrically with.
Above-mentioned system, described baffle plate is adjustable as 30 °-60 ° with the angle of horizontal plane；Hole diameter on described baffle plate
For 10mm-30mm.
Above-mentioned system, described reduction shaft furnace can be block furnace, described baffle plate length along the incline direction at described inclination angle
Degree is 0.5-0.95 times of the described reduction shaft furnace length of side, and the rotary shaft of adjacent described baffle plate is at the vertical direction of described reduction shaft furnace
0.2-1.5 times that distance is the described reduction shaft furnace length of side.
Above-mentioned system, the material of described baffle plate is heat-resistance stainless steel；Described baffle plate and the junction of described reduction shaft furnace
It is provided with sealing device；Described rotating shaft is provided with rotation drive rod.
Above-mentioned system, the exhanst gas outlet of the described molten point of stove flue gas by reduction shaft furnace described in high-temperature flue gas pipeline communication
Import, described high-temperature flue gas pipe interior is provided with water-cooled flue.
Above-mentioned system, the feed opening of described reduction shaft furnace is provided with radar level gauge or capacitance material level meter；Described reduction vertical
The breeze of stove and flux feeding mouth and described coal powder entrance are connected with speed governing batcher respectively.
Above-mentioned system, the structure of described oxygen rifle is telescopic water cooled lance, and the material of the lance head of described oxygen rifle is copper,
The sleeve internal layer of described oxygen rifle is blowing oxygen layer, and outermost is cooling circulating water layer；The oxygen inlet of described blowing oxygen layer
Connect and have oxygen channel.
The invention provides a kind of method utilizing said system to carry out molten point of stove reduction, described method includes step: will
Breeze and flux and coal dust are sent into described reduction shaft furnace and are carried out reduction reaction, generate reduction breeze and pyrolysis carbon dust；Go back described
Original ore powder and carbon dust send into described molten point of stove, to described molten point of stove injecting oxygen and make described carbon dust and oxygen by described oxygen rifle
Burning, obtains the ore deposit liquid after reduction reaction and slag；The described molten point of high-temperature flue gas that stove produces is passed through described reduction shaft furnace.
Above-mentioned method, described method may further comprise the step of: by speed governing batcher governing speed to control described breeze
Feeding amount with flux and coal dust；By regulating the amount of oxygen of described oxygen rifle to regulate the combustion rate of described carbon dust so that not also
Former breeze reacts further；By promoting the heating-up temperature of described oxygen rifle to realize ore deposit liquid and slag separation in stove, by outward
Enclose slag skimmer and realize the outer ore deposit liquid of stove and slag separation；By the regulation described breeze time of staying in described reduction shaft furnace with control
Make the reduction degree of described breeze；Enter in described reduction shaft furnace to control flue gas by controlling the water yield in high-temperature flue gas pipeline
Temperature；Come by the delivery rate controlling described breeze and coal dust after the feed opening of described reduction shaft furnace detects material position further
Regulation breeze and the feeding amount of coal dust, to prevent described feed opening from blocking.
The beneficial effects of the present invention is, it is possible to use breeze at a low price and the higher lump ore of coal dust fictitious hosts and pelletizing
Ore deposit；The present invention can be adjusted by the friction speed regulation coal dust of regulation batcher, the ratio of breeze；The present invention uses pure oxygen to fire
Burning, the high temperature of generation can meet smelts, to low-grade ore etc. is difficult, the needs that ore deposit is melted point；The high-temperature flue gas of molten point of stove can supply
Direct reduction furnace is with heating reduction breeze.
Additionally, regulating measure of the present invention is the most, including delivery rate regulation, the regulation of blanking speed, amount of oxygen and coal dust
Amount regulation, unburned coal powder amount regulation etc., multiple regulating measure and the various state modulator in smelting process and adjustment adapt, and protect
Demonstrate,prove the reduction effect of breeze.
Accompanying drawing explanation
Fig. 1 is the system structure sketch of the embodiment of the present invention；
Fig. 2 is the reduction shaft furnace interior panelling front view structural representation of the embodiment of the present invention；And
Fig. 3 be in Fig. 2 the A of reduction shaft furnace interior panelling to structural representation.
Detailed description of the invention
Below in conjunction with drawings and Examples, the detailed description of the invention of the present invention is described in more details, in order to energy
The advantage being enough more fully understood that the solution of the present invention and its various aspects.But, specific embodiments described below and reality
Executing example is only descriptive purpose rather than limitation of the present invention.
Below in conjunction with accompanying drawing 1, embodiments of the invention are described in further detail.Injecting oxygen in the present embodiment
A molten point of stove also original system include: 1, breeze hopper；2, speed governing batcher；3, reduction shaft furnace；4, smoke evacuation system；5, baffle plate；6、
High-temperature flue gas pipeline；7, feed opening；8, oxygen rifle；9 molten points of stoves；10, tapping hole；11 coal dust hoppers；12 speed governing batchers；13 oxygen
Pipeline.Wherein, breeze hopper 1, coal dust hopper 11, speed governing batcher 2 and 12 etc. can arrange according to actual needs or be replaced by it
Its device.
Described reduction shaft furnace 3 includes breeze and flux feeding mouth, coal dust feeding mouth, feed opening 7, smoke inlet, described ore deposit
Powder and flux feeding mouth are located at the top of described reduction shaft furnace 3, and described feed opening 7 and smoke inlet are located at described reduction shaft furnace 3
Bottom；Being provided with the baffle plate 5 of adjustable inclination in the burner hearth of described reduction shaft furnace 3, described baffle plate 5 is located at described breeze and flux
Under feeding mouth and coal dust feeding mouth, on described feed opening and described smoke inlet；Described baffle plate 5 and described reduction shaft furnace 3
Inwall leave gap, described baffle plate 5 is disposed with aperture；Described baffle plate 5 is by the rotating shaft 51 through described reduction shaft furnace 3 furnace wall
It is supported on described reduction shaft furnace 3.Front view in the reduction shaft furnace 3 of the concrete structure of baffle plate 5 such as Fig. 2 and the A of Fig. 3 are to regarding
Figure.
The material of the baffle plate 5 in reduction shaft furnace 3 is generally heat-resistance stainless steel.
A described molten point stove 9 includes feeding mouth, exhanst gas outlet and discharging opening, and described feeding mouth connects described reduction shaft furnace 3
Feed opening 7, described exhanst gas outlet connects the smoke inlet of described reduction shaft furnace 3.
The lance head of described oxygen rifle 8 is located in described molten point of stove 9, and described oxygen rifle 8 stretches into institute from the furnace roof of described molten point of stove 9
State in molten point of stove 9.
Multiple baffle plate 5 with described inclination angle it is sequentially provided with from top to bottom in the burner hearth of described reduction shaft furnace 3, adjacent described
The vertical centrage of the most described reduction shaft furnace in inclination angle 3 of baffle plate 5 is arranged symmetrically with.
The present invention utilizes breeze at a low price and coal dust to instead of the higher lump ore of price and pellet.
Breeze and flux in breeze hopper 1 can send into direct-reduction shaft furnace by speed governing batcher 2 according to a certain percentage
3, speed governing batcher 2 may be designed as spiral speed regulation batcher, ensures direct-reduction shaft furnace 3 and breeze hopper 1 while feed
Between sealing.
Another hopper 11 is set simultaneously and deposits coal dust, utilize the coal dust of 12 0-1mm of speed governing batcher to send into the most also
Former shaft furnace 3.
Coal dust, the proportioning of breeze is controlled by the friction speed arranging batcher.
The delivery rate of speed governing batcher 2 and 12 depends on the response speed of molten point of stove 9, and specific targets can be by molten point
CO in the flow of the CO reducing gases that stove produces and outlet reducing gas2Content determine.Reducing gas flow is big, CO2Content
Little, then increase feeding coal, otherwise, reduce feeding coal.Generally, the CO that direct-reduction shaft furnace 3 exit detects2Body
Long-pending content is between 15-25%, and the volume content of CO is between 70%-80%, and remaining gas is the trace gas such as nitrogen, hydrogen
Body.
The baffle plate 5 of adjustable inclination is set in reduction shaft furnace 3, after breeze enters direct-reduction shaft furnace 3, along baffle plate 5 to
Lower flowing, the design principle of controllable register is the longest principle in material path, ensures again the cigarette in direct-reduction shaft furnace 3 simultaneously
Atmidometer can not be the biggest.
According to above principle, simultaneously according to baffle plate 5 and the coefficient of friction of breeze, for foursquare reduction shaft furnace, design
0.5-0.95 times of the baffle plate 5 a length of reduction shaft furnace length of side along the incline direction at described inclination angle, preferably about 0.75 times.
Difference in height between the rotary shaft of adjacent screen is 0.2-1.5 times of the reduction shaft furnace length of side, preferably about 0.5 times.Baffle plate 5 with
The range of accommodation of the angle of horizontal plane is defined as 30 °-60 °.The structure of instantiation and size are as shown in Fig. 2 and Fig. 3.In figure
Concrete structure and size are exemplary illustration.Certainly reduction shaft furnace can also be other shape as circular.When reduction shaft furnace is other
Shape time, be also according to the longest principle in material path and consider can not be too big to the flue gas resistance in direct-reduction shaft furnace 3, come
The structure of design baffle plate and arrangement form.
When the angle of baffle plate 5 with horizontal plane is 36 °, total distance of stream is about 2.1 times of reduction shaft furnace 3 height.
Due to frictional force and the impact of collision, material falls to being become the reciprocal downglide motion of low speed by the movement of falling object, with whole process is
The situation (being not provided with baffle plate) of free-falling is compared, and breeze fall time is 5-12 times of free-fall time.Below specifically join
Number can make the appropriate adjustments according to the wind speed in reduction shaft furnace 3 and powder particle size scope.The material of baffle plate 5 is heat-resistance stainless steel.Gear
Plate is disposed with the aperture of diameter 10mm-30mm, and reducibility gas is flow through aperture and reduction shaft furnace and gear by the lower section of reduction shaft furnace 3
Gap between plate 5 flows up, to ensure the contact of breeze and reducibility gas.
Baffle plate 5 have the rotating shaft 51 that baffle plate can be made movable and and reduction shaft furnace 3 between sealing device.Can be at baffle plate 5
On set reinforcement 52 to ensure the intensity of baffle plate 5 and rigidity.The rotation of baffle plate 5 can hand-turning also can drive, at baffle plate 5 by machine
On can be designed with rotation drive rod 53.
Reducibility gas reverse flow in breeze, coal dust and reduction shaft furnace 3, breeze is in the condition of high temperature reductive gas
Under be reduced into direct-reduction iron powder, coal dust is pyrolyzed under the high temperature conditions, and the carbon granule after pyrolysis enters a molten point of stove by feed opening 7
9, pyrolysis gas is discharged into next procedure with flue gas and processes.Reduced iron powder enters molten point of stove 9 also by feed opening 7.Molten point of stove 9
High-temperature flue gas outlet enters direct-reduction shaft furnace 3 after high-temperature flue gas pipeline 6, and high-temperature flue gas pipeline 6 is internal arranges water-cooled cigarette
Road, enters the temperature of direct-reduction shaft furnace 3 by controlling the water yield to control flue gas.Associated temperature according to the difference of Ore kind and
Difference, general range is between 750 DEG C to 1100 DEG C.Through direct-reduction furnace rear, passing through and breeze heat exchange, temperature drops to
Between 520 DEG C to 750 DEG C.
The feed opening 7 of direct-reduction shaft furnace 3 is by arranging the facility such as radar level gauge or capacitance material level meter sensing blanking feelings
Condition, prevents feed opening 7 from blocking.If it find that feed opening 7 gathers materials too much, reduce blanking by the delivery rate controlling top
Amount, prevents blocking.
Oxygen rifle structure is telescopic water cooled lance, and wherein, middle injecting oxygen, outermost is cooling circulating water, oxygen rifle 8
Head material is copper lance head.
Breeze is during falling to bottom from direct-reduction shaft furnace 3 top, and progressively classification reduction, by regulation breeze
The time of staying in direct-reduction shaft furnace 3, reduction shaft furnace exit breeze degree of metalization can reach to control its reduction degree
About 80%.Remain unreduced breeze and carry out drastic reduction in molten point of stove 9.
The heat that molten point of stove utilizes oxygen+carbon dust in stove to produce makes metal mining powder melt.Slag and flux shape in the reaction
Become foamed slag.The direct-reduction iron powder that foamed slag charge capture enters, oxygen rifle 8 immerses in foamed slag simultaneously, makes oxygen, carbon dust exist
Combustion reaction in foamed slag, is used for providing heat.
Oxygen rifle, by carbon dust combustion rate in control amount of oxygen control stove, in unburned carbon dust enters foamed slag and does not partly reduce
Breeze react further, make breeze the most thoroughly reduce.
Molten iron and slag are got rid of from tapping hole 10, realize the outer slag sluicing system of stove through peripheral slag skimmer.Foamed slag leads to simultaneously
Crossing and make the heating-up temperature of oxygen rifle 8 raise, in finally realizing stove, scum separates.
The present invention uses pure oxygen burning, and the high temperature of generation can meet the low-grade needs waiting difficulty to smelt Ore.
The high-temperature flue gas of molten point of stove 9 can supply direct-reduction shaft furnace 3 with heating reduction breeze, thus realizes waste gas again
Utilize.
The regulating measure of the present invention is the most, adjusts including delivery rate regulation, the regulation of blanking speed, amount of oxygen and coal dust amount
Joints etc., multiple regulating measure has adapted to various state modulator and the adjustment of smelting process, it is ensured that reduction effect.
Embodiment
Breeze hopper 1 put into by breeze and a small amount of flux pulverized limestone, is sent by the speed governing batcher 2 of breeze hopper 1 bottom
Enter to be reduced directly shaft furnace 3.Coal dust puts into coal dust hopper 11, and coal dust is sent into also by the speed governing batcher 12 of coal dust hopper 11 bottom
Former shaft furnace 3.Breeze and solvent and coal dust are fallen above the baffle plate 5 of inclination and whereabouts of progressively sliding.From molten point of stove 9 high temperature out
CO gas enters direct-reduction shaft furnace 3 by high-temperature flue gas pipeline 6.High temperature CO gas and breeze reaction, breeze generates directly also
Former iron powder, iron powder enters molten point of stove 9 through feed opening 7.Oxygen enters oxygen rifle 8 by oxygen channel 13, in stove and carbon granule
Burning provides heat, makes temperature rise to the temperature that reaction needs.Rear ore deposit liquid and slag are reacted by tapping hole 10 interval
Property discharge.Erect the complete gas of reaction in furnace to be got rid of by smoke discharging pipe 3, enter lower road treatment process.
Hereinafter it is specifically described step by step.
The Iron Ore Powder of particle diameter about 0-1mm is put into hopper according to the part by weight of 10:1 with addition of part pulverized limestone.Breeze
Composition such as following table:
Table 1
| Element | Fe | SiO<sub>2</sub> | Al<sub>2</sub>O<sub>3</sub> | CaO | MgO | S | P |
| Content % | 62.8 | 5.2 | 0.8 | 0.9 | 0.5 | 0.01 | 0.05 |
According to the speed of 2 ton hour, breeze is sent into direct-reduction shaft furnace by the speed governing batcher under hopper.
The coal dust of particle diameter 0-1mm is put into hopper.The composition of coal dust such as following table:
Table 2
| Composition, % | Fixed carbon | Fugitive constituent | Ash | S |
| Coal dust | 65～75 | 20～25 | 7～10 | 0.2～0.3 |
According to the speed of 1 ton hour, coal dust is sent into direct-reduction shaft furnace by the speed governing batcher under hopper.
Baffle plate 5 in regulation reduction shaft furnace 3 so that it is between Angle ambiguity to 40 °-60 °.
In molten point of stove 9, temperature is controlled to about 1350 DEG C, subsequently into directly by high-temperature flue gas out by water-cooled flue
Connect reduction shaft furnace 3, and breeze mixing.CO reaction in breeze and flue gas is reduced into iron powder, enters molten point of stove 9 by feed opening 7,
DRI meal component such as following table:
Table 3
| Element | Fe | SiO<sub>2</sub> | Al<sub>2</sub>O<sub>3</sub> | CaO | MgO | S | P |
| Content % | 85 | 7.1 | 1.1 | 1.2 | 0.8 | 0.02 | 0.18 |
After pyrolysis, coal dust becomes coke powder, composition such as following table:
Table 4
| Composition, % | M<sub>ad</sub> | A<sub>ad</sub> | V<sub>ad</sub> | FC<sub>ad</sub> |
| Carbon dust | 0.50 | 7.55 | 5.08 | 86.87 |
Wherein, the M in table 4adRepresent air-dried moisture；AadRepresent and be dried base ash；VadRepresent air-dried basis to wave
Send out and divide；FCadRepresent air-dried basis fixed carbon.
Pure oxygen enters to melt a point stove 9 by oxygen lance spraying, and amount of oxygen is 900Nm3/h.The unburned carbon dust of part is to not thorough reduction
Ferrum oxide reduces further.
Control oxygen amount and coal amount, it is ensured that the temperature in molten point of stove 9 is 1750 DEG C.
Open tapping hole according to reaction in furnace situation to tap a blast furnace and slag tap in good time.
Hot metal composition such as following table:
Table 5
| Fe | C | Si | Mn | P | S | Molten iron temperature |
| 95.29 | 4.11 | 0.35 | 0.21 | 0.05 | 0.02 | ～1500 |
The composition of slag such as following table:
Table 6
| CaO | SiO<sub>2</sub> | MgO | Al<sub>2</sub>O<sub>3</sub> | MnO | FeO | CaO/SiO<sub>2</sub> |
| 43.44 | 37.78 | 8.2 | 9.3 | 0.54 | 0.43 | 1.15 |
As seen from the above-described embodiment, effectively low-grade breeze to be reduced to iron-holder higher for technical scheme
Molten iron.
It is last that it is noted that obviously above-described embodiment is only for clearly demonstrating example of the present invention, and also
The non-restriction to embodiment.For those of ordinary skill in the field, can also do on the basis of the above description
Go out change or the variation of other multi-form.Here without also cannot all of embodiment be given exhaustive.And thus drawn
What Shen went out obviously changes or changes among still in protection scope of the present invention.
Claims (10)
1. a molten point of stove also original system of injecting oxygen, described system includes reduction shaft furnace, melts point stove and an oxygen rifle, wherein,
Described reduction shaft furnace includes breeze and flux feeding mouth, coal dust feeding mouth, feed opening, smoke inlet, and described breeze is with molten
Agent feeding mouth and described coal dust feeding mouth are located at the top of described reduction shaft furnace, and described feed opening and smoke inlet are located at described going back
The bottom of former shaft furnace；Be provided with the baffle plate of adjustable inclination in the burner hearth of described reduction shaft furnace, described baffle plate be located at described breeze and
Under flux feeding mouth, on described feed opening and described smoke inlet；Described baffle plate leaves with the inwall of described reduction shaft furnace
Gap, described baffle plate is disposed with aperture；Described baffle plate by the rotating shaft support through described reduction shaft furnace furnace wall in described reduction
On shaft furnace；
A described molten point stove includes feeding mouth, exhanst gas outlet and discharging opening, and described feeding mouth connects the feed opening of described reduction shaft furnace,
Described exhanst gas outlet connects the smoke inlet of described reduction shaft furnace；
The lance head of described oxygen rifle is located in described molten point of stove, and described oxygen rifle stretches into described molten point of stove from the furnace roof of described molten point of stove
In.
System the most according to claim 1, it is characterised in that be sequentially provided with from top to bottom in the burner hearth of described reduction shaft furnace
Multiple baffle plates with described inclination angle, the vertical centrage symmetry cloth of the most described reduction shaft furnace in inclination angle of adjacent described baffle plate
Put.
System the most according to claim 1, it is characterised in that the angle of described baffle plate and horizontal plane be adjustable as 30 °-
60°；Hole diameter on described baffle plate is 10mm-30mm.
System the most according to claim 1, it is characterised in that described reduction shaft furnace is block furnace, and described baffle plate is along described
0.5-0.95 times of a length of described reduction shaft furnace length of side on the incline direction at inclination angle, the rotary shaft of adjacent described baffle plate is in institute
The distance of the vertical direction stating reduction shaft furnace is 0.2-1.5 times of the described reduction shaft furnace length of side.
System the most according to claim 1, it is characterised in that the material of described baffle plate is heat-resistance stainless steel；Described baffle plate
It is provided with sealing device with the junction of described reduction shaft furnace；Described rotating shaft is provided with rotation drive rod.
System the most according to claim 1, it is characterised in that the exhanst gas outlet of described molten point of stove is by high-temperature flue gas pipeline
Connecting the gas approach of described reduction shaft furnace, described high-temperature flue gas pipe interior is provided with water-cooled flue.
System the most according to claim 1, it is characterised in that the feed opening of described reduction shaft furnace be provided with radar level gauge or
Capacitance material level meter；The breeze of described reduction shaft furnace and flux feeding mouth and described coal dust feeding mouth are connected with speed governing batcher respectively.
System the most according to claim 1, it is characterised in that the structure of described oxygen rifle is telescopic water cooled lance, described
The material of the lance head of oxygen rifle is copper, and the sleeve internal layer of described oxygen rifle is blowing oxygen layer, and outermost is cooling circulating water layer；Institute
The oxygen inlet connection stating blowing oxygen layer has oxygen channel.
9. utilizing the method that system described in any one of claim 1 to 8 carries out molten point of stove reduction, described method includes step
Rapid:
Breeze and flux and coal dust are sent into described reduction shaft furnace and carries out reduction reaction, generate reduction breeze and pyrolysis carbon dust；
Described reduction breeze and carbon dust are sent into described molten point of stove, to described molten point of stove injecting oxygen and makes institute by described oxygen rifle
State carbon dust and oxygen combustion, obtain the ore deposit liquid after reduction reaction and slag；
The described molten point of high-temperature flue gas that stove produces is passed through described reduction shaft furnace.
Method the most according to claim 9, it is characterised in that described method further comprises the steps of:
By speed governing batcher governing speed to control described breeze and the feeding amount of flux and coal dust；
By regulating the amount of oxygen of described oxygen rifle to regulate the combustion rate of described carbon dust so that unreduced breeze is the most anti-
Should；
By promoting the heating-up temperature of described oxygen rifle to realize ore deposit liquid and slag separation in stove, realized outside stove by peripheral slag skimmer
Ore deposit liquid and slag separation；
By the regulation described breeze time of staying in described reduction shaft furnace to control the reduction degree of described breeze；
The temperature in described reduction shaft furnace is entered to control flue gas by controlling the water yield in high-temperature flue gas pipeline；
Come by the delivery rate controlling described breeze and coal dust after the feed opening of described reduction shaft furnace detects material position further
Regulation breeze and the feeding amount of coal dust, to prevent described feed opening from blocking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610637901.0A CN106086278A (en) | 2016-08-05 | 2016-08-05 | A kind of molten point of stove reduction system and method for injecting oxygen |
Applications Claiming Priority (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106755689A (en) * | 2016-12-15 | 2017-05-31 | 江苏省冶金设计院有限公司 | A kind of cold bound pellet prepares the gas-based shaft kiln and its method of sponge iron |
| CN112226824A (en) * | 2020-09-30 | 2021-01-15 | 李小刚 | Automatic carry out non-woven fabrics of ratio and spout fine hair feeding device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106755689A (en) * | 2016-12-15 | 2017-05-31 | 江苏省冶金设计院有限公司 | A kind of cold bound pellet prepares the gas-based shaft kiln and its method of sponge iron |
| CN112226824A (en) * | 2020-09-30 | 2021-01-15 | 李小刚 | Automatic carry out non-woven fabrics of ratio and spout fine hair feeding device |
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