CN106148627A - A kind of molten point of stove reduction system and method for natural gas oxygen heating - Google Patents
A kind of molten point of stove reduction system and method for natural gas oxygen heating Download PDFInfo
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- CN106148627A CN106148627A CN201610638597.1A CN201610638597A CN106148627A CN 106148627 A CN106148627 A CN 106148627A CN 201610638597 A CN201610638597 A CN 201610638597A CN 106148627 A CN106148627 A CN 106148627A
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- shaft furnace
- stove
- reduction shaft
- natural gas
- breeze
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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
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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
- C21B13/006—Starting from ores containing non ferrous metallic oxides
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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
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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
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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- Chemical & Material Sciences (AREA)
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- Organic Chemistry (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The present invention relates to molten point of stove reduction system and method for a kind of natural gas oxygen heating.Described system includes reduction shaft furnace, molten point of stove and natural gas oxygen lance, and wherein, described reduction shaft furnace includes breeze and flux feeding mouth, feed opening, smoke inlet, is provided with the baffle plate of adjustable inclination in the burner hearth of described reduction 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, and described exhanst gas outlet connects the smoke inlet of described reduction shaft furnace；The lance head of described natural gas oxygen lance is located in described molten point of stove, and described natural gas oxygen lance 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 natural gas oxygen heating 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 the molten of a kind of natural gas oxygen heating
Divide stove reduction 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.Further, the most natural
The objectionable impurities such as the S in gas enter molten iron, have impact on the quality of ferrum.
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.Further, the objectionable impurities such as the S in a large amount of natural gass enters molten iron, have impact on the quality of ferrum.
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 to avoid the S in natural gas etc. are harmful miscellaneous
Matter enters molten iron, it is ensured that the reduction effect of breeze, it is necessary to propose a kind of molten point of new stove reduction system and method.
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 natural gas oxygen heating so that this work
Artistic skill enough directly utilizes the powders such as breeze, coal dust, pulverized limestone and completes direct reduction reactor in shaft furnace, it is to avoid the S in natural gas
Enter molten iron Deng objectionable impurities, and simplify multi-stage fluidized bed process, and transporting velocity and the residence time of breeze can be controlled, with
Ensure the reduction effect of breeze.
The invention provides a molten point of stove also original system of a kind of natural gas oxygen heating, described system include reduction shaft furnace,
Molten point of stove and natural gas oxygen lance, wherein, described reduction shaft furnace includes breeze and flux feeding mouth, feed opening, smoke inlet, institute
Stating breeze and flux feeding mouth is located at the top of described reduction shaft furnace, described feed opening and smoke inlet are located at described reduction shaft furnace
Bottom；Being provided with the baffle plate of adjustable inclination in the burner hearth of described reduction shaft furnace, described baffle plate is located at described breeze and flux enters
Under material mouth, on described feed opening and described smoke inlet；Described baffle plate leaves gap with the inwall of described reduction shaft furnace, institute
State and on baffle plate, be disposed with aperture；Described baffle plate by the rotating shaft support through described reduction shaft furnace furnace wall on described reduction 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 natural gas oxygen lance is located in described molten point of stove,
Described natural gas oxygen lance 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
Breeze and the flux feeding mouth of stove are connected with speed governing batcher.
Above-mentioned system, the structure of described natural gas oxygen lance is telescopic water cooled lance, described natural gas oxygen lance
The material of lance head is copper, and the sleeve internal layer of described natural gas oxygen lance is natural gas winding-up layer, and intermediate layer is blowing oxygen layer,
Outermost is cooling circulating water layer；The oxygen inlet of described blowing oxygen layer connects oxygen channel, described natural gas winding-up layer
Imported gas connect natural gas line.
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 are sent into described reduction shaft furnace and are carried out reduction reaction, generate reduction breeze；Described reduction breeze is sent into described molten
Divide stove, melt point stove Natural GasInjecting and oxygen by described natural gas oxygen lance to described and make described natural gas and oxygen combustion
Burn, 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.
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；By regulating the described natural gas of natural gas oxygen lance and the proportioning of oxygen to control the burning of natural gas
Rate so that unreduced breeze reacts further；By promoting the heating-up temperature of described natural gas oxygen lance to realize ore deposit in stove
Liquid and slag separation, realize the outer ore deposit liquid of stove and slag separation by peripheral slag skimmer；By regulating described breeze in described reduction
The time of staying in shaft furnace is to control the reduction degree of described breeze；By the water yield in control high-temperature flue gas pipeline to control flue gas
Enter the temperature in described reduction shaft furnace；By controlling described ore deposit after the feed opening of described reduction shaft furnace detects material position further
The delivery rate of powder regulates the feeding amount of breeze, 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 by regulation natural gas and the quantity of the unburned natural gas of burden control of oxygen, so that breeze is by thoroughly also
Former；The present invention uses pure oxygen burning, and the high temperature of generation can meet smelts, to low-grade iron ore etc. is difficult, the needs that ore deposit is melted point；Molten point
The high-temperature flue gas of stove can supply direct reduction furnace with heating reduction breeze.The present invention also utilizes natural gas and oxygen combustion heating
Make molten point of reduction breeze, reduce the usage amount of natural gas, reduce the objectionable impurities content such as S, P in molten iron.
Regulating measure of the present invention is the most, adjusts including delivery rate regulation, the regulation of blanking speed, amount of oxygen and amount of natural gas
Joint, unburned amount of natural gas regulation etc., multiple regulating measure and the various state modulator in smelting process and adjustment adapt, it is ensured that
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.Coal dust oxygen in the present embodiment
A molten point stove also original system for heating includes: 1, raw material hopper；2, smoke evacuation system；3, speed governing batcher；4, reduction shaft furnace；5, gear
Plate；6, high-temperature flue gas pipeline；7, feed opening；8, natural gas oxygen lance；9 molten points of stoves；10, tapping hole；11, oxygen channel；12, sky
So feed channel；13, natural gas adjusting valve；14, natural gas air accumulator.Wherein, raw material hopper, speed governing batcher, natural gas gas storage
Tank, natural gas adjusting valve etc. can arrange or be replaced by other device according to actual needs.
Described reduction shaft furnace 4 includes breeze and flux feeding mouth, feed opening 7, smoke inlet, described breeze and flux pan feeding
Mouth is located at the top of described reduction shaft furnace 4, and described feed opening 7 and smoke inlet are located at the bottom of described reduction shaft furnace；Described also
Being provided with the baffle plate 5 of adjustable inclination in the burner hearth of former shaft furnace 4, described baffle plate 5 is located under described breeze and flux feeding mouth, institute
State on feed opening and described smoke inlet；Described baffle plate 5 leaves gap, on described baffle plate 5 with the inwall of described reduction shaft furnace 4
It is disposed with aperture；Described baffle plate 5 is supported on described reduction shaft furnace 4 by the rotating shaft 51 through described reduction shaft furnace 4 furnace wall.Baffle plate
Front view in the reduction shaft furnace 4 of the concrete structure of 5 such as Fig. 2 and the A direction view of Fig. 3.
A described molten point stove 9 includes feeding mouth, exhanst gas outlet and discharging opening, and described feeding mouth connects described reduction shaft furnace 4
Feed opening 7, described exhanst gas outlet connects the smoke inlet of described reduction shaft furnace 4.
The lance head of described natural gas oxygen lance 8 is located in described molten point of stove 9, and described natural gas oxygen lance 8 is from described molten
The furnace roof dividing stove 9 stretches in described 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 4, adjacent described
The vertical centrage of the most described reduction shaft furnace in inclination angle 4 of baffle plate 5 is arranged symmetrically with.
The present invention utilizes breeze at a low price to instead of the higher lump ore of price and pellet.
Breeze and flux in raw material hopper 1 can send into direct-reduction shaft furnace by speed governing batcher 3 according to a certain percentage
4, speed governing batcher 3 may be designed as spiral speed regulation batcher, ensures direct-reduction shaft furnace 4 and raw material hopper 1 while feed
Between sealing.
The delivery rate of speed governing batcher 3 depends on the response speed of molten point of stove, and specific targets can be produced by molten point of stove
CO in the flow of raw CO reducing gases and outlet reducing gas2Content determine.Reducing gas flow is big, and CO2 content is little, then
Increase feeding coal, otherwise, reduce feeding coal.Generally, the CO detected at direct-reduction spout of shaft furnace2Volume content exists
Between 10-20%, CO volume content between 60%-70%, H2O steam content is about 15%, and remaining gas is nitrogen, hydrogen
The minimum gas such as gas.
The baffle plate 5 of adjustable inclination is set in shaft furnace, after breeze enters direct-reduction shaft furnace 4, along baffle plate 5 to dirty
Dynamic, the design principle of controllable register is the longest principle in material path, ensures again the flue gas resistance in direct-reduction shaft furnace 4 simultaneously
Power 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 4, 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 4 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 4 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 4
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 between sealing device.Can be on baffle plate 5
If reinforcement 52 is to ensure intensity and the rigidity of baffle plate 5.The rotation of baffle plate 5 can hand-turning also can drive, on baffle plate 5 by machine
Rotation drive rod 53 can be designed with.
Reducibility gas reverse flow in breeze and shaft furnace, breeze is reduced into directly under conditions of high temperature reductive gas
Reduced iron powder, enters molten point of stove 9 by feed opening 7.The high-temperature flue gas outlet of molten point of stove 9 enters after high-temperature flue gas pipeline 6
Direct-reduction shaft furnace 4, high-temperature flue gas pipeline 6 is internal arranges water-cooled flue, enters directly also to control flue gas by controlling the water yield
The temperature of former shaft furnace 4.Associated temperature is different according to the difference of Ore kind, and general range is between 750 DEG C to 1100 DEG C.Warp
After crossing direct-reduction shaft furnace 4, flue gas passes through and breeze heat exchange, and temperature drops between 520 DEG C to 750 DEG C.
The feed opening 7 of direct-reduction shaft furnace 4 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.
Natural gas oxygen lance structure is telescopic water cooled lance, and wherein, middle Natural GasInjecting, periphery is oxygen, outermost
Side is cooling circulating water, and the head material of natural gas oxygen lance 8 is copper lance head.
Breeze is during falling to bottom from direct-reduction shaft furnace 4 top, and progressively classification reduction, by regulation breeze
The time of staying in direct-reduction shaft furnace, reduction shaft furnace exit breeze degree of metalization can reach 80% to control its reduction degree
Left and right.Remain unreduced breeze and carry out drastic reduction in molten point of stove 9.
Molten point of stove utilizes the heat of oxygen-natural gas winding-up burning generation to make metal mining powder melt.According to breeze reduction degree
Difference, can in molten point of stove with addition of a small amount of carbon granule as reducing agent.Slag and flux form foamed slag in the reaction.Foam
The direct-reduction iron powder that slag charge capture enters, natural gas oxygen lance 8 immerses in foamed slag simultaneously, makes oxygen, natural gas at bubble
Combustion reaction in foam slag, is used for providing heat.
The combustion rate of natural gas is controlled by the ratio controlling natural gas and oxygen.By improving natural gas ratio to produce
A part of unburned natural gas.Unburned natural gas decomposes generation CO and H in entering foamed slag2, also can further participate in reduction reaction,
Breeze is made the most thoroughly to 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 natural gas oxygen lance 8 raise, in finally realizing stove, scum separates.
The present invention can be by regulation natural gas and the quantity of the unburned natural gas of burden control of oxygen, so that breeze is thorough
It is reduced.
The present invention uses pure oxygen burning, and the high temperature of generation can meet smelts, to low-grade iron ore etc. is difficult, the need that ore deposit is melted point
Want.
The high-temperature flue gas of molten point of stove 9 can supply direct-reduction shaft furnace 4 with heating reduction breeze, thus realizes waste gas again
Utilize.
The present invention also utilizes natural gas and oxygen combustion heating to make molten point of reduction breeze, decreases the usage amount of natural gas,
Reduce the objectionable impurities content such as S, P in molten iron.
It addition, reduced iron must be compressed into hot-pressed iron compact in prior art, it is to prevent pruinescence air-flow from blowing away, and makes smelting
Stove has certain breathability；Present invention utilizes generation foamed slag in molten point of stove and solve problem above.Because available foam
Slag catches powder, utilizes the bigger serface of foamed slag as reflecting carrier and solving the breathability of material.
The regulating measure of the present invention is the most, including delivery rate regulation, the regulation of blanking speed, amount of oxygen and amount of natural gas
Regulation, unburned amount of natural gas regulation etc., multiple regulating measure has adapted to various state modulator and the adjustment of smelting process, it is ensured that
Reduction effect.
Embodiment
Raw material hopper 1 put into by breeze and a small amount of flux pulverized limestone, is sent by the speed governing batcher 2 of raw material hopper 1 bottom
Entering to be reduced directly shaft furnace 4, whereabouts of progressively sliding above the baffle plate 5 of inclination fallen by breeze.From molten point of stove 9 high temperature CO gas out
Direct-reduction shaft furnace 4 is entered by high-temperature flue gas pipeline 6.High temperature CO gas and breeze reaction, breeze generates direct-reduction iron powder,
Iron powder enters molten point of stove 9 through feed opening 7.Natural gas out, is entered by natural gas line 12 in natural gas air accumulator 14
Spray gun, its flow is controlled by the regulation valve 13 on pipeline.Natural gas oxygen burns in stove provides heat and reaction to need
Temperature.Wherein natural gas can be the artificial natural gas that pyrolyzing coal provides, it is also possible to be market natural gas.React rear ore deposit liquid
Discharge by tapping hole 10 is intermittent with slag.Erect the complete gas of reaction in furnace to be got rid of by smoke discharging pipe 3, enter lower road and process
Operation.
Hereinafter it is specifically described step by step.
The iron mine of particle diameter about 0-1mm, carbon granule, pulverized limestone are put into raw material hopper 1 according to the part by weight of 10:2:1.
The composition of breeze such as following table:
Table 1
| Element | Fe | SiO2 | Al2O3 | CaO | MgO | S | P |
| Content % | 62.8 | 5.2 | 0.8 | 0.9 | 0.5 | 0.01 | 0.05 |
The composition of carbon granule such as following table:
Table 2
| Composition, % | Fixed carbon | Fugitive constituent | Ash | S |
| Mixture Density Networks | 85～90 | 5～7 | 7～10 | 0.2～0.3 |
Speed governing batcher 3 under raw material hopper 1 sends breeze into direct-reduction shaft furnace 4 according to the speed of 2 ton hour.
Baffle plate 5 in regulation shaft furnace so that it is Angle ambiguity is between 40 °-60 °.
In molten point of stove 9, temperature is controlled to about 1050 DEG C, subsequently into directly by high-temperature flue gas out by water-cooled flue
Connect reduction shaft furnace 4, and breeze mixing.CO+H in breeze and flue gas2Reaction is reduced into iron powder, enters molten point by feed opening 7
Stove 9, the composition such as following table of direct-reduction iron powder:
Table 3
| Element | Fe | SiO2 | Al2O3 | CaO | MgO | S | P |
| Content % | 85 | 7.1 | 1.1 | 1.2 | 0.8 | 0.02 | 0.18 |
Natural gas and pure oxygen spray into molten point of stove 9 by natural gas oxygen lance 8.
The ferrum oxide of not thoroughly reduction is reduced by part carbon granule further.Control oxygen amount and amount of natural gas, protect
In molten point of stove 9 of card, temperature is 1750 DEG C.
Open tapping hole 10 according to reaction in furnace situation to tap a blast furnace and slag tap in good time.
The composition of molten iron such as following table:
Table 4
| 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 5
| CaO | SiO2 | MgO | Al2O3 | MnO | FeO | CaO/SiO2 |
| 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 natural gas oxygen heating, described system includes reduction shaft furnace, molten point of stove and natural gas
Oxygen lance, wherein,
Described reduction shaft furnace includes that breeze and flux feeding mouth, feed opening, smoke inlet, described breeze and flux feeding mouth are located at
The top of described reduction shaft furnace, described feed opening and smoke inlet are located at the bottom of described reduction shaft furnace；Described reduction shaft furnace
Be provided with the baffle plate of adjustable inclination in burner hearth, described baffle plate is located under described breeze and flux feeding mouth, described feed opening and
On described smoke inlet；Described baffle plate leaves gap with the inwall of described reduction shaft furnace, and described baffle plate is disposed with aperture；Institute
State baffle plate by the rotating shaft support through described reduction shaft furnace furnace wall on described reduction 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 natural gas oxygen lance is located in described molten point of stove, and described natural gas oxygen lance is from the stove of described molten point of stove
Top is stretched in described molten point of stove.
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；Breeze and the flux feeding mouth of described reduction shaft furnace are connected with speed governing batcher.
System the most according to claim 1, it is characterised in that the structure of described natural gas oxygen lance is the spray of telescopic water-cooled
Rifle, the material of the lance head of described natural gas oxygen lance is copper, and the sleeve internal layer of described natural gas oxygen lance is natural gas winding-up
Layer, intermediate layer is blowing oxygen layer, and outermost is cooling circulating water layer；The oxygen inlet of described blowing oxygen layer connects oxygen
Pipeline, the Imported gas of described natural gas winding-up layer connects natural gas line.
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 are sent into described reduction shaft furnace and carries out reduction reaction, generate reduction breeze；
Described reduction breeze is sent into a described molten point of stove, by described natural gas oxygen lance to described molten point of stove Natural GasInjecting with
Oxygen also makes described natural gas and oxygen combustion, 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.
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；
By regulating the described natural gas of natural gas oxygen lance and the proportioning of oxygen to control the combustion rate of natural gas so that not also
Former breeze reacts further；
By promoting the heating-up temperature of described natural gas oxygen lance to realize ore deposit liquid and slag separation in stove, by peripheral slag skimmer
Realize the outer ore deposit liquid of stove 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；
Ore deposit is regulated by the delivery rate controlling described breeze behind the feed opening of described reduction shaft furnace detection material position further
The feeding amount of powder, to prevent described feed opening from blocking.
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| CN111621611A (en) * | 2020-06-03 | 2020-09-04 | 北京科技大学 | Two-step method for efficiently separating iron and phosphorus from high-phosphorus iron-containing resource based on gas-based energy |
| CN112088142A (en) * | 2018-03-27 | 2020-12-15 | 米德雷克斯技术公司 | Oxygen injection system for direct reduction process |
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