CN109477151A - Heating plasma air blast - Google Patents
Heating plasma air blast Download PDFInfo
- Publication number
- CN109477151A CN109477151A CN201880000931.8A CN201880000931A CN109477151A CN 109477151 A CN109477151 A CN 109477151A CN 201880000931 A CN201880000931 A CN 201880000931A CN 109477151 A CN109477151 A CN 109477151A
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- Prior art keywords
- air
- hot blast
- general pipeline
- mixing
- blast
- Prior art date
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/002—Heated electrically (plasma)
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/06—Making pig-iron in the blast furnace using top gas in the blast furnace process
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/10—Cooling; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
- C21B7/163—Blowpipe assembly
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
- C21B9/02—Brick hot-blast stoves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
- F27B1/16—Arrangements of tuyeres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
- F27B1/24—Cooling arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/02—Supplying steam, vapour, gases, or liquids
-
- 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
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Plasma Technology (AREA)
- Furnace Details (AREA)
Abstract
Mixing air is heated to raised temperature using plasmatorch by a kind of air mixer of remodeling, which is retrofitted to the air mixer in air blast furnace system.Heating plasma air mixes in hot blast general pipeline with the heating air from hot blast stove, to improve the temperature of mixing air blast before being delivered to blast furnace.Advantageously, the temperature for being delivered to the air of blast furnace can be equal to or higher than the highest air themperature that hot blast stove technically produces.Air themperature can be increased to the design maximum temperature of hot blast refractory system (exporting to tuyere outlet from hot blast stove).Reduce coke ratio it can be seen that being delivered to the increased hot drum air temperature of blast furnace, allows fuel to inject and increase, increase blast furnace output, and reduce CO2Discharge.
Description
Technical field
This patent disclosure relates generally to before by blast supply to blast furnace to the heating of air blast, and more particularly, to will
Blast heating is to beyond its ordinary temperature.
Background technique
The purposes of blast furnace is by iron oxide electronation and physical transformation be liquid iron.Blast furnace is huge kiln
Furnace, and it has the steel chimney of cone, is lined with refractory brick and copper and/or cast iron cooling element.In operation, such as iron
The raw material of mine pelletizing, the ore of sintering and/or bulk, coke and sludging flux etc is put into the top of blast furnace, and pre-add
The air and oxygen of heat are blown into the bottom of blast furnace together with the fuel injected.Raw material needs 6 to 8 hours to be deposited to drum
The bottom of wind furnace, in this time point, raw material has become the final product of liquid slag and liquid iron.In some cases, these liquid
State product is discharged from stove with regular intervals, and in other situations, which is continuously discharged from stove.It is blown into drum
The heating air of wind furnace bottom rises to the top of blast furnace, a large amount of chemical reaction of whole process experience in 6 to 8 seconds.
Hot-blast stove heat and be discharged into the air of heating (being known as hot blast) with about 900 to 1300 DEG C to air
In blast furnace.In blast furnace, the increased oxygen of hot blast and institute makes coke and the fuel combustion injected.The production of such burning
Object includes heat, gas (CO and H2), carbon black and ash content.Iron oxide is reduced into the pig iron of melting by these combustion products.It comes from
The gangue mineral of ore and ash content from coal and coke are combined with fusant, form molten slag.
Detailed description of the invention
Attached drawing will now be referred to by way of example, attached drawing shows illustrative embodiments, in attached drawing:
Fig. 1 shows the exemplary configurations of the blast furnace including hot blast general pipeline；
Fig. 2 shows in plan view typical air mixer relevant to the hot blast general pipeline of Fig. 1；
Fig. 3 shows the typical air mixer relevant to the hot blast general pipeline of Fig. 1 of Fig. 2 with Section A-A comprising
B-B arrow；
Fig. 4 shows the typical air mixer relevant to the hot blast general pipeline of Fig. 1 of Fig. 3 with the view of B-B arrow；
Fig. 5 with before the right side to solid show a kind of hot blast general pipeline including air mixer, the air mixer
It is transformed into the plasmatorch with the one side according to the application；
Fig. 6 shows the imperfect air mixing combined with the plasmatorch of Fig. 5 and hot blast general pipeline with perspective cut-away view
Device.
Fig. 7 shows the plasmatorch in the mixing tube of the air mixer of Fig. 5 with perspective cut-away view, is added with air
Shielding part and protection refractory tube；
Fig. 8 shows plasmatorch and associated tuyere with schematic cross section；
Fig. 9 shows in cross section the plasmatorch that installation is cooperateed with water cooling structure part according to present aspects；
Figure 10 shows in cross section the mixing chamber that transformation in mixer air intlet has plasmatorch；
Figure 11 shows in plan view the modified mixing chamber of Figure 10；
Figure 12 shows in cross section the blending tank that transformation in mixer air intlet has plasmatorch；
Figure 13 shows in plan view the modified blending tank of Figure 12；
Figure 14 shows in cross section the line mixer that transformation in air intlet has plasmatorch；And
Figure 15 shows the table for summing up the effect that blast temperature is improved using plasma energy.
Specific embodiment
Disclosed aspect according to the present invention, the method for being provided with operation air blast furnace system, which includes hot drum
Wind general pipeline, hot blast is passed into blast furnace from least one hot stove through hot blast general pipeline, and hot blast general pipeline is with designated
For the temperature controlled air intlet of hot blast.This method includes reducing the amount of the carbon dioxide discharged by air blast furnace system.It should
Reduction is accomplished by the following way: the heating plasma of plasmatorch of the origin self installation in mixer air intlet
The jet stream of gas heats the air for being passed through hot blast general pipeline from mixer air intlet to mix with hot blast.By around
The cold air shielding part for leaving the heating plasma gas jet of plasmatorch, reduces the fire proofed wood for being transmitted to hot blast general pipeline
Heat on material controls the temperature of hot blast general pipeline refractory material associated with hot blast general pipeline.
According to another aspect of the present invention, a kind of air mixer of remodeling is provided.The air mixer of the remodeling
It include: air intlet, which includes refractory material；Plasmatorch, which is mounted in air intlet, and fits
In being heated using the jet stream of heating plasma gas through air intlet to be mixed with the hot-air from hot blast general pipeline
Air；And shroud gas import component, to provide the cold air shielding part of the jet stream around heating plasma gas, thus
Reduce the heat for being transferred to refractory material.
Disclosed further aspect according to the present invention, is provided with a kind of method that mixer is transformed, which includes
Air intlet, the air intlet include refractory material.This method comprises: plasmatorch is installed to air intlet, to allow to use
The jet stream of heating plasma gas from plasmatorch heats the air being passed through from inlet of cold air to mix with hot blast；
And shroud gas import component is installed in association with plasmatorch, to provide the air shielding part of cold air, around
Thus heating plasma air reduces the heat for being transmitted to refractory material.
The description below in conjunction with attached drawing to specific embodiment disclosed by the invention, other sides disclosed by the invention are read
Face and feature will be apparent to those skilled in the art.
Fig. 1 shows a kind of air blast furnace system 100 comprising blast furnace 102, multiple heating furnaces 104 and is lined with fire proofed wood
The pipe-line system of material.Blast furnace 102 includes tuyere 106.It can be seen that the pipe-line system for being lined with refractory material includes that hot blast is total
Pipe 108.
In operation, 104 heating cold air of heating furnace.Be heated air blast (be hot blast now, usually 900-1300
DEG C) through hot blast general pipeline 108 it is transported to tuyere 106.When entering blast furnace 102 via tuyere 106, hot blast and coke and
The fuel combustion injected to melt iron ore, pelletizing, and is sintered to the pig iron and clinker of melting.
Heating furnace 104 is recuperative heat exchanger, and is understood to be supplied to hot blast with stationary temperature
Blast furnace 102.When furnace air heat cycles start, the air themperature left from selected heating furnace 104 is in its maximum
Value.Regrettably, as time goes by, due to the heat-energy losses from the fireproof lattice brick in heating furnace 104, which is reduced.
Fig. 2 shows in plan view known air mixer 200 relevant to hot blast general pipeline 108.Air mixer 200
Including mixing air import 202 and multiple mixing tubes 204.Fig. 2 shows one of mixing tubes 204 directly to be presented by mixing import 202
It send.Fig. 2 also shows one of mixing tube 204 and feeds via distributor 206.Fig. 3 is shown and hot blast general pipeline with Section A-A
The mixer 200 of 108 relevant Fig. 2 comprising B-B arrow.Fig. 4 is shown and hot blast general pipeline 108 with the view of B-B arrow
The mixer 200 of relevant Fig. 2.
In order to provide stationary temperature to blast furnace 102, can be used air mixer 200 to leave heating furnace 104 and into
Further mixing air (about 100-300 DEG C) is added in the hot blast for entering hot blast general pipeline 108.When heating furnace 104 is being run
In at the ending in its thermal cycle when often do so.Mixing air mixes in hot blast general pipeline 108 with hot blast,
Generate mixing air blast.Mixing air blast has the set temperature chosen, and the set temperature is lower than the hot drum air temperature before mixing.Whole
In a furnace in air blast circulation, the flow rate that the mixing air in hot blast is added to through air mixer 200 can be by using sky
Air valve (not shown) and gradually decrease.It can be seen that this is gradually decreased, to obtain the mixing air blast into blast furnace 102 constant
Temperature.Once the air valve for air mixer 200 is closed, heating furnace 104 can leave air blast and recycle and return to heating
Circulation.In warming cycle, the fireproof lattice brick in heating furnace 103 is burned blast furnace gas and reheats, the gas
Usually it is supplemented with natural gas and/or oxygen.The heating furnace 104 of update then can come into operation.It therewith responsively, can be again in sky
Mixing air is added at gas mixer 200, obtains the set point to control the temperature of mixing air blast.
Cause to mix temperature of the temperature possessed by air blast lower than hot blast as mixing hot blast with mixing air, it can
To think that the blast furnace smelting process of such pattern has intrinsic poor efficiency.When mixing air blast supplies seasonable, drum with steady temperature
The smooth operation of wind furnace smelting technology, but the efficiency of blast furnace smelting process is used air mixer 200 to can be obtained most
The limitation of big constant blast temperature.
In general, there is presented herein using plasmatorch that some or all mixing airs are heated to high temperature,
And then the mixing air heated is mixed with the hot blast for leaving heating furnace 104.Enter blast furnace 102 through tuyere 106
Mixing air blast obtained will have the temperature for being higher than hot blast.
Fig. 5 shows remodeling air mixer 500 relevant to hot blast general pipeline 108 with solid.The remodeling air is mixed
Clutch 500 includes mixing air import 502 and multiple mixing tubes 504.
Existed according to the difference of the various aspects of the application, the air mixer 200 for the air mixer 500 and Fig. 2 that retrofits
In remodeling air mixer 500 includes multiple plasmatorch 508A, 508B, 508C, 508D (respectively or generally 508).
Plasmatorch is arcing gas heater, generates high temperature ionized gaseous conductor, to obtain from the straight of electric arc
Connect hot transmission.It has been found that the Xi Wu plasma company (Westinghouse of the Mt.Pleasant positioned at Pennsylvania
Plasma Corporation) label be 11H plasmatorch be suitable as multiple plasmatorch 508.
As shown in figure 5, plasmatorch 508 is inserted into the mixing tube 504 fed via distributor 506.
Conventional is that relatively cold mixing air is added to from heating furnace 104 by means of air mixer 200 to come out
Hot blast in.
Advantageously, it herein proposes and the mixing air after heating is added to from heating by means of hot blast mixer 500
In the hot blast that furnace 104 comes out.
Mixing air after the addition heating proposed as a result, the fireproof lattice brick in the heating furnace 104 reaches it
Most Warm status when, be supplied to blast furnace 102 mixing air blast temperature be equal to or more than in air blast Thermal Cycling initially
The temperature of the hot blast come out from heating furnace 104.This keeps with by adding colder mixing air into blast furnace 102
The conventional method of constant mixing blast temperature is opposite.The conventional method is also referred to as " downward temperature adjustment (downward
temperature trimming)".What is proposed herein is related to the party of the air after the offer heating of hot blast general pipeline 108
Formula can show the temperature for increasing mixing air blast, so that temperature possessed by the mixing air blast exceeds the thermal capacitance of heating furnace 104
Amount.The use of mode presented herein can be shown and result in coke consumption reduction, blast furnace output increase and CO2Row
Reduction is put, this is because the utilization to obtainable energy is more effective.
As shown in Figure 5, the air mixer 500 of remodeling includes inlet of cold air 502, which is arranged to
The allocated device 506 feeds multiple mixing tubes 504.The hot blast general pipeline 108 that the air mixer 500 of remodeling is connected is shown as
With multiple holes, the mixing tube 504 for the air mixer 500 with remodeling is connected.Each hole and 516 phase of flanged type import
Association.Plasmatorch relevant to appended drawing reference 508A is associated with that mixing tube of appended drawing reference 504 is associated with.It is additional
Plasmatorch 508B, 508C, 508D do not mark associated mixing tube associated with other with certain figures.
As can be from being best appreciated from Fig. 6, hot blast general pipeline 108 be shown with outer housing 514 and refractory material
510, which can be formed by steel.Each of multiple holes in the outer housing 514 of hot blast general pipeline 108 hole leads to following
Road is associated, which passes through flanged type import 516 and pass through refractory material 510 and the inside into hot blast general pipeline 108.Note
It anticipates and arrives, it can be seen that the operation of each plasmatorch 508 increases the refractory material 510 and/or outer housing of hot blast general pipeline 108
A possibility that 514 overheat, and refractory material 510 and/or outer housing 514 that this is likely to result in hot blast general pipeline 108 damage.
Herein propose, by provide air shielding part come alleviate hot blast general pipeline 108 refractory material 510 and/or
Any overheat of outer housing 514.For this purpose, plasmatorch 508A is shown as connecting by shroud gas import component 614
To the hole of hot blast general pipeline 108.A kind of non-diatomic gas can be added in the shroud air in air shielding part.It is non-double former
The example of sub- gas includes H2O and CO2.It can show, non-diatomic gas plays absorption a part and issues from plasma jet
Radiation energy effect.By this method, due to the transmission of radiations heat energy, it can show that non-diatomic gas enhances shielding
Air reduces the ability of the heating to refractory material 510.
Herein also, it has been proposed that alleviating the refractory material 510 of hot blast general pipeline 108 by the fireproof construction that subregion is arranged
And/or the overheat of outer housing 514, the fireproof construction of the subregion are directed to the purposes of the ultra-high temperature near plasmatorch flame location
Using specified fire resisting or ceramic material.The fireproof construction of the subregion can be realized as across each flange of hot blast general pipeline 108
Formula import 516 and the physical shielding portion for passing through refractory material 510, to protect refractory material 510 without departing from its running temperature pole
Limit.It is noted that the material in the physical shielding portion can be different from the refractory material 510 of hot blast general pipeline 108.As shown in fig. 6, the object
Managing shielding part may include two components, i.e. import refractory tube 612A is to protect flanged type import 516 and main refractory tube (host
Refractory tube) 612B to be to protect the refractory material 510 of hot blast general pipeline 108.Alternatively, the physical shielding portion can be formed
For single refractory tube.
Fig. 7 shows plasmatorch 508A in the mixing tube of the air mixer 500 of the remodeling of Fig. 5 with sectional block diagram
Operation.In operation, plasmatorch 508A generates the jet stream 722 of heating plasma gas.
Still in this operation, shroud gas import component 614 is equipped with the shielding part 720 of cooler air, has or not
With non-diatomic gas added by the jet stream 722 around heating plasma gas, thus to protect fire-resistant shield portion 612A/
The refractory material 510 and/or outer housing 514 of 612B, hot blast general pipeline 108.
The exemplary disclosure to shroud gas import component 614 can be found in United States Patent (USP) No.:7,095,283, schemed
8 initially occur from the United States Patent (USP).
The plasmatorch 40 that Fig. 8 is positioned with the import 42 that schematic cross section shows neighbouring tuyere 44.Tuyere 44 is pacified
In the wall of reaction vessel 10, and define chamber 46.Chamber 46 can have cylinder-shaped or frustoconical shape.Deng from
Sub- torch 40 include nozzle 48, the nozzle structure at along circumferential direction guide heating plasma gas jet stream (in this example, etc.
The jet stream of Ion Heating gas is guided along the central axis 50 of chamber 46).Chamber 46 can have perpendicular to central axis
Circular cross section in 50 plane.Plasma jet can have for example from the temperature in the range of 5000-8000 DEG C.Shield gas
Body import component 52 is configured to provide colder gas (i.e. shroud gas) to heating plasma gas (plasma jet) week
It encloses, and the plasma jet is shielded from chamber wall.The shroud gas import component 52 can be positioned adjacent to tuyere import.
Tuyere chamber 46 can be lined with refractory material 54, and can be cooled down by fluid, water-cooled jacket or tubulose cooling coil may be used, at this
Depending on being not shown in the figure, in the water-cooled jacket or the cold wall for going coil pipe that can be embedded in tuyere 44 of tubulose.In other embodiments, the chamber
It can be water cooling coil pipe or the copper billet with cooling duct, not be lined with refractory material.Cooling air-flow can be guided as follows,
Wherein plasma jet is kept focus on axis, and shroud gas flows between plasma jet and chamber wall.
Fig. 9 is in the flanged type import 516 for being mounted on hot blast general pipeline 108 of the cross sectional view according to the various aspects of the application
Plasmatorch 908, matched with air cooled refractory sleeve 902 and/or water cold sleeve 904.It proposes, makes herein
The refractory material 510 and outer housing 514 of hot blast general pipeline 108 are protected with refractory sleeve and cooling air and/or aquaporin.
As the jet stream for the heating plasma gas in conjunction with discussing Fig. 7, having plasmatorch 908 to generate can be surrounded with air
Shielding part, the air shielding part is generated using shroud gas import component 922, and shroud gas import component 922 limits shielding
Gas feed.When cooling air passes through shroud gas import component 922 and is inserted into plasma jet and air cooled fire resisting
When between casing 902, air shielding part is produced.As previously alluded, such as H2The non-diatomic of O (steam) etc
Gas can be added in cooling air, to absorb some radiations heat energies from plasma jet, be transmitted to fire resisting to reduce
The heat of material 910.
As understood by those skilled in the art, the air mixer 200 of Fig. 2 be not uniquely can by mixing air with
The known method that hot blast from heating furnace 104 mixes.Figure 10-16 shows other known air mixer, according to
The various aspects of the application, it is suitable for by blast heating to exceed its ordinary temperature.
Figure 10, which is shown in cross section, designs 1000 for the mixing chamber of air mixer.These multiple mixing chamber
1000 is mountable in air blast furnace system, such as the air blast furnace system 100 of Fig. 1.In fact, these mixing chamber 1000 are mountable
In the exit of each heating furnace 104.The mixing chamber 1000 has hot drum wind inlet 1004 and pairs of mixing air import
1005A, 1005B (respectively or being generally 1005).In general, before entering hot blast general pipeline 1008, in hot drum wind inlet
The hot blast being accepted at 1004 and the mixing air being accepted at mixing air import 1005 mix in cylinder 1002,
Hot blast general pipeline 1008 is similar to the hot blast general pipeline 108 of Fig. 1.
According to the various aspects of the application, plasmatorch 1006A, 1006B (respectively or generally be 1006) can with it is each
Mixing air import 1005 is correspondingly installed.As discussed above, plasmatorch 1006 can be used in mixing air
The mixing air is heated with before mixing from the air that heating furnace 104 comes out, temperature is thus generated and is greater than usually by heating furnace
The mixing air blast of generated temperature.
In the mode consistent with the mode of the refractory material of protection hot blast general pipeline 108 as shown in Figure 7 and steel,
The refractory material and steel of mixing chamber 1000 can be protected by fire-resistant shield portion.Air or water can be used to cool down fire-resistant shield
Portion.In addition, in operation, the refractory material and steel of mixing chamber 1000 can be protected by air shielding part, air shielding
Portion is generated by using shroud gas import component.
Figure 11 shows in plan view the modified mixing chamber 1000 of Figure 10.It should be understood that in Figure 10 and 11
Plasmatorch 1006 alternatively can be positioned on the bottom of mixing chamber 1000, thus from each plasmatorch 1006 it is equal from
Sub- jet stream is projected vertically upward in cylinder 1002, rather than is horizontally projected.At least in terms of the challenge for reducing fire resisting overheat,
It is expected that perpendicular projection plasma jet will have the advantages that better than horizontal projection plasma jet
Figure 12, which is shown in cross section, designs 1200 for the blending tank of air mixer.The blending tank 1200 is located at heating
104 downstream of furnace, between the bostle pipe of heating furnace and blast furnace plant nearest in multiple heating furnaces 104." nearest heating
Furnace " is the heating furnace nearest from blast furnace.In most of blast furnace installations, heating furnace may be arranged to embark on journey, and therefore can
There is a heating furnace measurably nearest from blast furnace.In China, rectangular heating furnace construction will use.In such configuration,
Physically the heating furnace nearest from blast furnace may not necessarily be located in multiple heating furnaces towards the downstream farthest of blast furnace
Heating furnace.
In operation, hot blast comes out from heating furnace 104 and is flowed into blending tank 1200 along hot blast general pipeline 1204
In central lumen 1202.Mixing air is injected into blending tank 1200 from bottom.Cooling air and hot blast are in central lumen
Mixing, and blending tank 1200 is left via mixing air outlet 1208, it is flowed into tuyere 106.The use class of blending tank 1200
It is similar to the use of mixing chamber 1000.One difference is, the feelings of a mixing chamber 1000 are associated with each heating furnace 104
Condition is on the contrary, only single blending tank 1200.
According to the various aspects of the application, plasmatorch 1206A, 1206B (respectively or generally be 1206) it is mountable
Mixing air entrance.As discussed above, plasmatorch 1206 can be used for going out in mixing air with from heating furnace 104
The air come heats the mixing air before mixing, and thus generates temperature and is greater than the usually temperature as caused by heating furnace 104
Mixing air blast.
In the mode consistent with the mode of the refractory material of protection hot blast general pipeline 108 as shown in Figure 7 and steel,
The refractory material and steel of blending tank 1200 can be protected by fire-resistant shield portion.Air or water can be used to cool down fire-resistant shield
Portion.In addition, in operation, the refractory material and steel of blending tank 1200 can be protected by air shielding part, the air shielding part
It is generated by using shroud gas import component.
Figure 13 shows in plan view the modified blending tank 1200 of Figure 12.
Figure 14 shows in cross section line mixer 1400.In routine operation, mixing air via mixing air into
Mouthful enter line mixer 1400, and be guided and circumferentially about hot blast air-flow.
According to the various aspects of the application, plasmatorch 1406A, 1406B (respectively or generally be 1406) can with it is each
Mixing air import is correspondingly installed.As discussed above, plasmatorch 1406 can be used for mixing air with from
The air that heating furnace 104 comes out heats the mixing air before mixing, and thus generates temperature and is greater than usually by 104 institute of heating furnace
The mixing air blast of the temperature of generation.
Advantageously, it can be seen that the various aspects of the application cause the overall of hot drum air temperature to increase, due to mixing hot drum
Contain more energy in wind, the ratio of the injected fuel of added relative moderate will be allowed to increase.
In the various aspects of the application, be delivered to the temperature of the mixing hot blast of blast furnace 102 by control it is good in a manner of
Increase.
Generally, the various aspects of the application are permitted by being adjusted to for temperature controlled added cooling air
Perhaps the energy for originating from hot blast stove 104 is optimized.In addition, blast furnace 102 can be in the temperature of existing refractory system
Limit is nearby operated.In addition, electric energy to be used as to the supplement energy source of heating air, and the carbon of blast furnace can be efficiently reduced
Consumption, and thus reduce CO2Discharge.
Figure 15 shows table 1500, which compares in five kinds of situations (basic scenario and four alternative situations)
The various aspects of temperature (" blast temperature ") in blast furnace 102.As that can see from table 1500, in response to blast temperature
Increase, various operating parameters also change.One Example operating parameters is that one tonne of thermometal (HM) blast furnace 102 of production is disappeared
The amount of coke of consumption.The amount of coke is referred to as " coke ratio (coke rate) ".Coke ratio is typically expressed as kg/t HM.It can from table 1500
To see, in response to the raising of blast temperature, coke ratio is reduced.
Another ion of operating parameter is breeze blowing (PCI).Coal dust injects usually at tuyere height.From table
1500 it can be seen that, be expressed as the PCI of kg/t HM and increase in response to the raising of blast temperature.As can be appreciated, in blast furnace
Various designs in, other fuel, including natural gas can be injected at tuyere height.It is noted that the cost of coke can be lower than
Obtain PCI and natural gas.There are also other more abnormal injected fuel, comprising: oven gas, heavy oil, such as kerosene
Coal tar pitch derivative, waste oil (machine oil), plastics and biomass.
With in response to higher temperature and coke ratio reduce and PCI increase, it is contemplated that find out one represent this two
The combined operating parameter of a operating parameter.The operating parameter of " fuel ratio " is proposed to realize this combination.It can from table 1500
To see, it is expressed as the fuel ratio of kg/t HM and reduces in response to the raising of blast temperature.As fuel ratio reduces, have occurred
CO2The corresponding reduction of discharge, because coke and PCI (or other injected fuel) represent the maximum carbon to blast furnace process
Input.
Another important operating parameter is power consumption, is expressed as kilowatt hour thermometal per ton (kWh/tHM).From table
1500 can see, and in response to the raising of blast temperature, power consumption increases.
Evaluated, in response to being heated to hot blast beyond its ordinary temperature, coke dosage can be reduced, and can be injected more
More fine coal or natural gas.As hot drum air temperature increases, obtained fuel ratio reduces.It can be seen that this leads to higher yield
And CO2Discharge is reduced, especially provided that the electricity to blast furnace is from renewable (that is, without CO2Generate) the energy.
By being heated to the hot blast come out from heating furnace beyond its ordinary temperature, it may also be seen that blast furnace process becomes
More efficiently.The reduction and the required blow rate required that the efficiency can just operate the saving of spending to measure, due to coke consumption amount
Reduction (being shown in Table " the specific blow rate required " in lattice 1500), the operation spending saving can see.Specifically the blow rate required is
The magnitude of air blast used in output iron per ton.In addition, having the yield from blast furnace by the various aspects for implementing the application
The increase of (tonnage of thermometal generated).
The above embodiment of the application is only as an example.Without departing from this Shen being defined by the appended claims
Please be under conditions of range, those skilled in the art can be replaced, modify and retrofit to each particular implementation.
Claims (23)
1. a kind of method for operating air blast furnace system, the air blast furnace system includes hot blast general pipeline, and hot blast is through the hot drum
Wind general pipeline is passed into blast furnace from least one heating furnace, and the hot blast general pipeline, which has, is specified for the control of hot drum air temperature
Air intlet；The described method includes:
The amount of the carbon dioxide discharged by the air blast furnace system is reduced, the reduction is accomplished by the following way: by coming from
The jet stream of the heating plasma gas for the plasmatorch being mounted in mixer air intlet is heated from the mixer air
Import is passed through air of the hot blast general pipeline to mix with the hot blast；And
By providing the cold air shielding part around the heating plasma gas jet come out from the plasmatorch, subtract
Thus the heat being transmitted on hot blast general pipeline refractory material less controls the hot blast associated with the hot blast general pipeline
The temperature of general pipeline refractory material.
2. the method as described in claim 1, which is characterized in that the cooling air includes non-diatomic gas.
3. method according to claim 2, which is characterized in that the non-diatomic gas includes H2O。
4. method according to claim 2, which is characterized in that the non-diatomic gas includes CO2。
5. the method as described in claim 1, which is characterized in that further include: by the hot blast general pipeline refractory material and
The fireproof construction of subregion is set between the cold air shielding part, is further reduced and sends the hot blast general pipeline refractory material to
Heat.
6. the method as described in claim 1, which is characterized in that further include: by the hot blast general pipeline refractory material and
Physics shielding part is set between the cold air shielding part, further reduces and sends the hot blast general pipeline refractory material to
Heat.
7. method as claimed in claim 6, which is characterized in that further include: by carrying out water cooling to the physical shielding portion, into
Reduce the heat for sending the hot blast general pipeline refractory material to one step.
8. method as claimed in claim 6, which is characterized in that further include: it is cold by carrying out air to the physical shielding portion
But, the heat for sending the hot blast general pipeline refractory material to is further reduced.
9. method as claimed in claim 6, which is characterized in that further include: in the hot blast general pipeline refractory material and described
Shell is arranged between portion in physical shielding.
10. method as claimed in claim 9, which is characterized in that further include: by carrying out water cooling to the shell, further
Reduce the heat for sending the hot blast general pipeline refractory material in ground.
11. method as claimed in claim 9, which is characterized in that further include: by carrying out air cooling to the shell, into
Reduce the heat for sending the hot blast general pipeline refractory material to one step.
12. the method as described in claim 1, which is characterized in that further include reducing the hot drum for being supplied to the blast furnace
The specific blow rate required of wind.
13. the method as described in claim 1, which is characterized in that further include increasing the fuel being injected into the blast furnace
Amount.
14. method as claimed in claim 13, which is characterized in that the fuel being injected into the blast furnace includes following
One of or it is a variety of: fine coal, natural gas, oven gas, heavy oil, kerosene, used oil, plastics and biomass.
15. a kind of air mixer of remodeling, comprising:
Mixing air import, the mixing air import includes refractory material；
Plasmatorch, the plasmatorch are mounted in the mixing air import, and are suitable for using heating plasma gas
Jet stream heats mixing air, the mixing air by the mixing air import with the hot-air from hot blast general pipeline
It mixes；And
Thus shroud gas import component is reduced and is passed to provide the cooling air shielding part for surrounding the heating plasma jet stream
Give the heat of the refractory material.
16. the air mixer retrofited as claimed in claim 15, which is characterized in that the cooling air includes non-diatomic
Gas.
17. the air mixer retrofited as claimed in claim 16, which is characterized in that the non-diatomic gas includes H2O。
18. the air mixer retrofited as claimed in claim 16, which is characterized in that the non-diatomic gas includes CO2。
19. the air mixer retrofited as claimed in claim 15, which is characterized in that further include resistance in the hot blast general pipeline
The fireproof construction of subregion between fiery material and the cold air shielding part.
20. the air mixer retrofited as claimed in claim 15, which is characterized in that further include resistance in the hot blast general pipeline
Physical shielding portion between fiery material and the cold air shielding part.
21. the air mixer retrofited as claimed in claim 20, which is characterized in that further include water cooling structure part, with to described
Physical shielding portion provides water.
22. the air mixer retrofited as claimed in claim 20, which is characterized in that further include air cooling component, with to
The physical shielding portion provides air.
23. a kind of method that mixer is transformed, the mixer includes mixing air import, and the mixing air import includes resistance to
Fiery material, which comprises
Plasmatorch is installed to the mixing air import, to allow by the heating plasma gas from the plasmatorch
Jet stream heats mixing air, and the mixing air is from the mixing air import by mixing with the hot blast；And
Shroud gas import component is installed in association with the plasmatorch, it is described to provide the air shielding part of cold air
Air shielding part surrounds the plasma jet, reduces the heat for being transmitted to the refractory material as a result,.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201762501512P | 2017-05-04 | 2017-05-04 | |
| US62/501,512 | 2017-05-04 | ||
| PCT/CA2018/050536 WO2018201259A1 (en) | 2017-05-04 | 2018-05-04 | Plasma heating blast air |
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| CN109477151A true CN109477151A (en) | 2019-03-15 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201880000931.8A Pending CN109477151A (en) | 2017-05-04 | 2018-05-04 | Heating plasma air blast |
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| CN (1) | CN109477151A (en) |
| WO (1) | WO2018201259A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114634999A (en) * | 2022-03-25 | 2022-06-17 | 新疆八一钢铁股份有限公司 | Oxygen blast furnace gas ultrahigh-temperature heating smelting method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU500686B1 (en) * | 2021-09-24 | 2023-03-24 | Wurth Paul Sa | Electric stove |
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| BE813264A (en) * | 1974-04-03 | 1974-10-03 | Injecting hot reducing gases into blast furnaces - via plasma generators and tuyeres in groups of three | |
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| JPS56169714A (en) * | 1980-05-30 | 1981-12-26 | Kobe Steel Ltd | Operation of hot blast stove for blast furnace |
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| WO2018201259A1 (en) | 2018-11-08 |
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