CN104411837B - Pig iron manufacture method and for the blast-furnace equipment of the method - Google Patents

Pig iron manufacture method and for the blast-furnace equipment of the method Download PDF

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Publication number
CN104411837B
CN104411837B CN201380035116.2A CN201380035116A CN104411837B CN 104411837 B CN104411837 B CN 104411837B CN 201380035116 A CN201380035116 A CN 201380035116A CN 104411837 B CN104411837 B CN 104411837B
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CN
China
Prior art keywords
blast
furna
pulverized coal
main body
coal injection
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Expired - Fee Related
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CN201380035116.2A
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CN104411837A (en
Inventor
大本节男
中川庆一
滨田务
坂口雅一
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B5/00Making pig-iron in the blast furnace
    • C21B5/001Injecting additional fuel or reducing agents
    • C21B5/003Injection of pulverulent coal
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B5/00Making pig-iron in the blast furnace
    • C21B5/008Composition or distribution of the charge
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B7/00Blast furnaces
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B7/00Blast furnaces
    • C21B7/16Tuyéres
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B7/00Blast furnaces
    • C21B7/16Tuyéres
    • C21B7/163Blowpipe assembly

Abstract

The invention provides a kind of blast-furnace equipment, it can suppress blast furnace blowing coal ash and be attached to pulverized coal injection into blast furna on the passage of blast furnace body interior or by passage obstruction, and can reduce pig iron manufacturing cost. This blast-furnace equipment (100) comprising: blast furnace main body (110); The raw material that contains iron ore and coal (1) is packed into inner raw material loading mechanism (111~113) from blast furnace main body top; Hot blast spraying and blowing organ (114,115) from from the blast orifice of blast furnace main body to inner blowing hot air (101); And from jet to the inside pulverized coal injection into blast furna feed mechanism (120~129) of pulverized coal injection into blast furna (11) of the blast orifice of blast furnace main body, wherein, the pulverized coal injection into blast furna feed mechanism oxygen atom content ratio (butt) that is used for jetting is the pulverized coal injection into blast furna that 10~20wt%, average pore diameter are 10~50nm, hot blast spraying and blowing organ is for measuring in advance raw material fusion point of ash, and the temperature of jetting is adjusted to the hot blast with respect to low 100~150 DEG C of this fusion point of ash.

Description

Pig iron manufacture method and for the blast-furnace equipment of the method
Technical field
The present invention relates to a kind of pig iron manufacture method and the blast-furnace equipment for the method.
Background technology
Blast-furnace equipment is by packing the raw materials such as iron ore, lime stone and coke into from blast furnace main body topPortion, and from blast orifice blowing hot air on the lower of this blast furnace main side portion with as the blast furnace of auxiliary fuelInjection coal (coal dust), can produce the pig iron with iron ore.
But, in order stably to move described blast-furnace equipment, need to suppress blast furnace blowing coal ash attachedAt pulverized coal injection into blast furna and lead on the passage of blast furnace body interior or passage is stopped up.
There is dealer for example to propose by adding in lower than the coal dust of 1300 DEG C at the grey softening point of coal dustAdd the CaO such as lime stone, serpentine class slag former, the grey softening point adjustment in coal dust is processed extremelyMore than 1300 DEG C, be only then that 1300 DEG C of above coal dusts are from blast furnace the grey softening point in coal dustThe blast orifice of main body is jetted to inside, improves combustible method (for example, the ginseng of pulverized coal injection into blast furnaAccording to following patent documentation 1).
In addition, also have dealer to propose a kind of blast-furnace coal powder injection operational method, by for example increasing and decreasing richnessComposition, the particle diameter etc. of oxygen amount or adjustment coal dust make it more nonflammable, and being reduced in convolution district can reachMaximum temperature, for example, even in the great operation of coal powder blowing amount, also (, can improve air permeabilityWith reference to following patent documentation 2).
Prior art document
Patent documentation
Patent documentation 1: Japanese patent laid-open 5-156330 communique
(for example, with reference to description paragraph [0014]-[0023], [Fig. 1] etc.)
Patent documentation 2: Japanese patent laid-open 11-152508 communique
Summary of the invention
The problem that invention quasi-solution is determined
But the blast-furnace coal powder injection method of recording in described patent documentation 1 only uses by addingState slag former, grey softening point adjustment is processed to more than 1300 DEG C coal dusts, therefore cause operationCost increases.
In addition the blast-furnace coal powder injection operational method of recording in described patent documentation 2, its breeze blowing,Amount greatly, need to specially be adjusted composition, the particle diameter of coal dust, therefore still can cause operating cost to increase.
In view of this, the present invention is made for solving above-mentioned problem, and object is to provide a kind of pig ironManufacture method and for the blast-furnace equipment of the method, it can suppress blast furnace blowing coal ash and be attached to blast furnaceInjection coal leads on the passage of blast furnace body interior or by passage obstruction, and can reduce pig iron manufactureCost.
The means of dealing with problems
The pig iron manufacture method that solves the 1st invention of above-mentioned problem, it will be by containing iron ore and coalThe raw material of charcoal packs inside into from blast furnace main body top, and jets to inside from the blast orifice of this blast furnace main bodyHot blast and pulverized coal injection into blast furna, use raw material iron ore to manufacture the pig iron, it is characterized in that, described blast furnace sprayBlowing coal is, oxygen atom content ratio (butt) is 10wt%~20wt%, and average pore diameter isThe pulverized coal injection into blast furna of 10nm~50nm, measures the fusion point of ash in described pulverized coal injection into blast furna in advance, willThe temperature of described hot blast is adjusted to the temperature with respect to low 100~150 DEG C of described fusion point of ash.
The pig iron manufacture method that solves the 2nd invention of above-mentioned problem is: a kind of life of above-mentioned the 1st inventionIron method, is characterized in that, at the described blast orifice of described blast furnace main body, described hot blast is carried outOxygen concentration.
The blast-furnace equipment that solves the 3rd invention of above-mentioned problem, it comprises: blast furnace main body; To contain ironThe raw material of ore and coal packs inner raw material loading mechanism into from described blast furnace main body top; From describedThe blast orifice of blast furnace main body is to the hot blast spraying and blowing organ of inner blowing hot air; And from described blast furnace main bodyDescribed blast orifice to the pulverized coal injection into blast furna feed mechanism of inside winding-up pulverized coal injection into blast furna, its feature existsIn, described pulverized coal injection into blast furna feed mechanism be used for jetting oxygen atom content ratio (butt) be 10~The pulverized coal injection into blast furna that 20wt%, average pore diameter are 10~50nm, described hot blast spraying and blowing organ is usedFusion point of ash in measuring in advance described raw material, winding-up temperature is adjusted into low with respect to this fusion point of ashDescribed hot blast after 100~150 DEG C.
The blast-furnace equipment that solves the 4th invention of above-mentioned problem is: a kind of blast furnace of above-mentioned the 3rd invention is establishedStandby, it is characterized in that also possessing oxygen concentration mechanism, this oxygen concentration mechanism is in described blast furnace main bodyDescribed blast orifice described hot blast is carried out to oxygen concentration.
The blast-furnace equipment that solves the 5th invention of above-mentioned problem is: a kind of blast furnace of above-mentioned the 4th invention is establishedStandby, it is characterized in that, described oxygen concentration mechanism has the spray gun of described oxygen circulation, described spray gunLeading section be configured in more close this blast furnace of base end part side of the described blast orifice of more described blast furnace main bodyThe position of the private side of main body.
Invention effect
According to pig iron manufacture method of the present invention and for the blast-furnace equipment of the method, owing to being that oxygen is formerSub-content ratio (butt) is 10~20wt%, the blast furnace spray that average pore diameter is 10~50nmBlow coal, the tar such as oxygen-containing functional group (carboxyl, aldehyde radical, ester group, hydroxyl etc.) generate that base departs from andSignificantly reduce, but the decomposition (minimizing) of main framing (combusting component centered by C, H, O)The pulverized coal injection into blast furna significantly being suppressed, is accompanied by that temperature is adjusted to respect to this pulverized coal injection into blast furnaThe hot blast that ash fusion point is low 100~150 DEG C is together to the winding-up of blast furnace body interior, the therefore temperature of hot blastBecome lower than the fusion point of ash in pulverized coal injection into blast furna, can suppress blast furnace blowing coal ash and be attached to blast furnace sprayBlowing coal leads on the passage of blast furnace body interior or passage is stopped up. Thus, blast-furnace equipment can be steadySurely move. And, because the ash in described pulverized coal injection into blast furna and described hot blast are together blown into heightFurnace main body inside but can melting, so can be using the cheap grizzle such as ub-bituminous coal, brown coal as heightStove injection coal uses, thereby can reduce pig iron manufacturing cost.
Brief description of the drawings
Fig. 1 is the schematic block diagram of the first embodiment of blast-furnace equipment of the present invention.
Fig. 2 is the schematic block diagram of the second embodiment of blast-furnace equipment of the present invention.
Fig. 3 is the enlarged drawing of major part in Fig. 2.
Detailed description of the invention
Below based on accompanying drawing to pig iron manufacture method of the present invention and for the blast-furnace equipment of the methodEmbodiment describes, but the present invention is not limited only to the following embodiment based on brief description of the drawings.
(the first embodiment)
Based on Fig. 1, pig iron manufacture method of the present invention and the blast-furnace equipment for the method are described belowThe first embodiment.
The raw material quantitative of the raw material 1 that as shown in Figure 1, weight feed contains iron ore and coke is supplied with dressPut 111, contact with the carrying direction upstream side of the charge conveyor 112 of carrying this raw material 1. This dressFurnace roof hopper 113 tops at the carrying direction downstream of material conveyer 112 and blast furnace main body 110 topsContact. The hot-blast conveying appliance 116 of heat air delivery 101 and the drum that is arranged at described blast furnace main body 110The blowpipe 117 in air port 118 connects.
In addition, near of described blast furnace main body 110 is equipped with the feed that supplies of supplying with pulverized coal injection into blast furna 11Bucket 120.
The oxygen atom content ratio (butt) of described pulverized coal injection into blast furna 11 is 10~18wt%, averagePore diameter is 10~50nm (preferably 20~50nm).
Above-mentioned pulverized coal injection into blast furna 11 be by by the ash fusion point such as ub-bituminous coal, brown coal conventionally lower (for example1200 DEG C) grizzle (oxygen atom content ratio (butt): exceed 18wt%, average poreDiameter: 3~4nm) in low-oxygen environment (oxygen concentration: below 5v/v%) heat (110~200 DEG C × 0.5~1 hour), dry, remove after moisture (oxygen concentration: 2v/v% in low-oxygen environmentHeating (460~590 DEG C (preferably 500~550 DEG C) × 0.5~1 hour), destructive distillation below),Water, carbon dioxide and tar part etc. are removed with the form of carbonization gas and empyreumatic oil, then existedThe method of (oxygen concentration: 2v/v% is following) cooling (50 DEG C following) in low-oxygen environment, can be easyThe material that ground is manufactured.
The base end side of the bottom of described feeding hopper 120 and conveyer belt 121 contacts, this conveyer belt 121Carrying is from the described pulverized coal injection into blast furna 11 in this feeding hopper 120. Before described conveyer belt 121The top of the distolateral reception hopper 122 with receiving described pulverized coal injection into blast furna 11 contacts.
The bottom of described reception hopper 122 is connected with the top receiving port of coal pulverizer 123, this coal pulverizer123 will be ground into specified diameter size (example from the described pulverized coal injection into blast furna 11 of this reception hopper 122As, 80 μ m are following). The below, side of described coal pulverizer 123 is connected with nitrogen gas supply source 124,Inert nitrogen gas 102 is supplied with in this nitrogen gas supply source 124. The top of described coal pulverizer 123 and carryingThe base end side of line 125 connects, and this transfer line 125 passes through the described pulverized coal injection into blast furna 11 of having pulverizedDescribed nitrogen 102 carries out strength carrying.
The front of described transfer line 125 with by 102 points of described pulverized coal injection into blast furna 11 and described nitrogenFrom cyclone separator (or bag filter) 126 connect. Under described cyclone separator 126Side contacts with the top of accumulating hopper 127 of accumulating described pulverized coal injection into blast furna 11. The described hopper that accumulates127 bottom is connected with the top of winding-up tank 128.
The side of described winding-up tank 128 on the lower quadrate part is connected with described nitrogen gas supply source 124. Described sprayThe top of blowing tank 128 is connected with the spray gun 129 that is connected in described blowpipe 117, by from described nitrogenSupply source 124, can be to supplying with to this winding-up tank to the described nitrogen 102 of the interior supply of this winding-up tank 128The described pulverized coal injection into blast furna 11 of 128 inside carries out strength carrying, is supplied to from above-mentioned spray gun 129State in blowpipe 117.
On above-mentioned hot-blast conveying appliance 116, be connected with hot blast temperature control device 115. Hot blast temperature controlOn device 115 processed, be connected with warm-air supply source 114. Hot blast temperature control device 115, according in advanceMeasure this blast furnace spray that the fusing point of the ash (blast furnace blowing coal ash) of above-mentioned pulverized coal injection into blast furna 11 obtainsBlow the fusing point of the ash (blast furnace blowing coal ash) of coal 11, the hot blast of Self-air-heating supply source 114 is adjusted in the futureWhole to the temperature with respect to low 100~150 DEG C of this fusion point of ash. For example, above-mentioned pulverized coal injection into blast furna 11The fusing point of ash (blast furnace blowing coal ash) while being 1200 DEG C, hot blast temperature control device 115 is by warmWind is adjusted to 1050~1100 DEG C.
In addition,, in Fig. 1,110a is the tapping hole for taking out liquid pig iron (molten iron) 2.
In present embodiment described above, described raw material quantitative feedway 111, described charging are defeatedSend machine 112, described furnace roof hopper 113 etc. to form raw material loading mechanism, described warm-air supply source 114,The structures such as described hot blast temperature control device 115, described hot-blast conveying appliance 116, described blowpipe 117Become hot blast spraying and blowing organ, described feeding hopper 120, described conveyer belt 121, described reception hopper122, described coal pulverizer 123, described nitrogen gas supply source 124, described transfer line 125, described whirlwindSeparator 126, described in accumulate hopper 127, described winding-up tank 128, described spray gun 129, described in blowManage 117 grades and formed pulverized coal injection into blast furna feed mechanism. Described hot blast temperature control device 115 formations such as gradeHot blast temperature controlling organization.
Then, describe for the pig iron manufacture method that uses above-mentioned blast-furnace equipment 100.
In addition, the coal ash of described pulverized coal injection into blast furna 11 (blast furnace blowing coal ash) fusing point will be measured in advance.
When described in described raw material quantitative feedway 111 weight feeds when raw material 1, this raw material 1 passes throughDescribed charge conveyor 112 is supplied in described furnace roof hopper 113, and is loaded into described blast furnace mainIn body 110.
Meanwhile, in the time described pulverized coal injection into blast furna 11 being dropped into described feeding hopper 120 inside,This pulverized coal injection into blast furna 11 is supplied to described reception hopper 122 by described conveyer belt 121, thenBe ground into specified diameter size (for example, 80 μ m are following) at described coal pulverizer 123.
Then, in the time supplying with described nitrogen 102 from described nitrogen gas supply source 124, described in having pulverizedPulverized coal injection into blast furna 11 is carried by described nitrogen 102 strengths, by described transfer line 125, is handled upside downTo described cyclone separator 126, after separating with described pulverized coal injection into blast furna 11, be discharged to systemOutward.
At the isolated described pulverized coal injection into blast furna 11 of described cyclone separator 126, described in being accumulated inAccumulate hopper 127 interior after, be supplied in described winding-up tank 128, by from described nitrogen gas supply source124 described nitrogen 102 strengths are carried to described spray gun 129, are then supplied to described blowpipe 117Inside.
Then, the gas with for example 240m/s from described hot-blast conveying appliance 116 to described blowpipe 117Flow Velocity is supplied with hot blast 101, and the temperature of this hot blast 101 is adjusted to respect to described pulverized coal injection into blast furnaThe fusing point of 11 ash (blast furnace blowing coal ash) is low 100~150 DEG C, makes thus described pulverized coal injection into blast furna11 preheatings are caught fire, and form flame at the front end of this blowpipe 117, burn, with described in convolution districtCoke in described raw material 1 in blast furnace main body 110 etc. reacts, and generates reducibility gas. ByThis, the iron ore in described raw material 1 is reduced and becomes the pig iron (molten iron) 2, from described tapping hole110a takes out. In addition, the oxygen concentration of described hot blast 101 is for example adjusted into 28%.
Herein, the average pore diameter of above-mentioned pulverized coal injection into blast furna 11 is 10~50nm, containing oxygen officialCan roll into a ball tar such as (carboxyl, aldehyde radical, ester group, hydroxyls) and generate base disengaging and significantly reduce, but oxygen is formerSub-content ratio (butt) is 10~18wt%, i.e. main framing (the combustion centered by C, H, OBurn till point) decomposition (minimizing) significantly suppressed.
Thus, above-mentioned pulverized coal injection into blast furna 11 is together blown into described blast furnace main with described hot blast 101, owing to containing many oxygen atoms in main framing, and pore diameter is large, so not when the inside of body 110Only make the oxygen of described hot blast 101 easily to diffusion inside, and utmost point difficult labour green coke oil, therefore baseThis can not produce unburned carbon (carbon black), can completing combustion.
In addition the hot blast 101 of carrying to blowpipe 117, is ashes of measuring in advance in pulverized coal injection into blast furna 11Fusing point after, temperature is not adjusted into the hot blast with respect to low 100~150 DEG C of this fusion point of ash, therefore notThere will be ash (blast furnace blowing coal ash) melting of pulverized coal injection into blast furna 11 and be attached to spray gun 129 and drumThe situation of air port 118 inner surfaces. , can suppress blast furnace blowing coal ash and be attached to pulverized coal injection into blast furna11 lead on the passage of blast furnace main body 110 inside or passage are stopped up. Therefore blast-furnace equipment 100Can stably move.
So, only use grey softening point adjustment to process to more than 1300 DEG C coal dusts even if do not adoptMethod, or coal powder blowing amount is when very big, adjusts the composition of coal dust and the method for particle diameter, also canInhibition blast furnace blowing coal ash is attached to pulverized coal injection into blast furna and leads on the passage of blast furnace body interior or incite somebody to actionPassage stops up.
Therefore, adopt present embodiment, can be using the cheap grizzle such as ub-bituminous coal, brown coal as heightStove injection coal 11 uses, and without using bituminous coal at high price etc., can reduce manufacturing of the pig iron 2This.
In addition, in described pulverized coal injection into blast furna 11, it is (excellent that average pore diameter is necessary for 10~50nmSelect 20~50nm). Because, if diameter lower than 10nm, the oxygen in hot blast 101 be difficult forTo diffusion inside, can cause flammability to decline; On the other hand, if diameter exceedes 50nm, holdEasily broken and become fine-powdered. Be blown into behind blast furnace main body 110 inside, if broken and become thinPowdery, can take advantage of the air-flow of gas directly through the inside of blast furnace main body 110, and process burning is not justBe discharged from.
In addition, in described pulverized coal injection into blast furna 11, oxygen atom content ratio (butt) also must be at 10wt%Above. Because if lower than 10wt%, do not containing oxidant or hot blast do not carried outIn the situation of oxygen concentration, be difficult to make its completing combustion.
Along band explanation, in the time manufacturing described pulverized coal injection into blast furna 11, pyrolysis temperature is necessary for 460~590 DEG C (preferably 500~550 DEG C). Because if lower than 460 DEG C, be difficult to make containing oxygen official energyGroup waits tar to generate base disengaging completely from described grizzle, and will make average pore diameter reach10~50nm is also very difficult; On the other hand, if exceed 590 DEG C, can make described grizzleMain framing (combusting component centered by C, H, O) start obviously decompose, cause and burn intoDivide very few.
(the second embodiment)
Based on Fig. 2 and Fig. 3, pig iron manufacture method of the present invention and the blast furnace for the method are described belowThe second embodiment of equipment. In addition, for the part identical with above-mentioned embodiment situation, use,The symbol identical with the symbol using in the explanation of above-mentioned embodiment, and omit and above-mentioned embodimentIn explanation repeat explanation.
The blast-furnace equipment 200 of present embodiment, as shown in Figures 2 and 3, has the blowpipe of being connected in 117The spray gun 214 for oxygen concentration arranging. Cardinal extremity and the oxygen conveying device of spray gun 214 for oxygen concentration213 connect. Oxygen conveying device 213 is connected with oxygen temperature control device 212. Oxygen temperature controlDevice 212 processed is connected with oxygen supply source 211.
Oxygen concentration is positioned at compared with the blast orifice of blast furnace main body 110 118 with the leading section 214a of spray gun 214The position of more close blast furnace main body 110 private sides of base end part 118a. Thus, in blast furnace main body 110Blast orifice 118 near can carry out oxygen concentration to hot blast 101, and can postpone pulverized coal injection into blast furna11 burning time started. , can suppress the pulverized coal injection into blast furna that pulverized coal injection into blast furna 11 burnings produceAsh is attached in blowpipe 117 or blowpipe is stopped up.
So, in the present embodiment, described oxygen supply source 211, described oxygen temperature control dressPut 212, described oxygen conveying device 213, described oxygen concentration spray gun 214 etc. formed oxygenEnrichment mechanism.
Then, the pig iron manufacture method that uses above-mentioned blast-furnace equipment 200 is described.
In addition, the coal ash of described pulverized coal injection into blast furna 11 (blast furnace blowing coal ash) fusing point will be measured in advance.
Identical with above-mentioned embodiment, by described pulverized coal injection into blast furna 11 via described feeding hopper 120,Described conveyer belt 121, described reception hopper 122, described coal pulverizer 123, described cyclone separator126, described in, accumulate hopper 127, be supplied in described winding-up tank 128, then by from described nitrogenDescribed nitrogen 102 strengths of supply source 124 are carried to described spray gun 129, are supplied to described blowpipe 117Inside.
Then, will be from described warm-air supply source 114 by described hot blast temperature control device 115The temperature of hot blast 101 be adjusted into the ash (blast furnace blowing coal ash) with respect to described pulverized coal injection into blast furna 11The temperature of low 100~150 DEG C of fusing point, by described hot-blast conveying appliance 116 to described blowpipe 117Air velocity with for example 240m/s is supplied with hot blast 101, and by described oxygen temperature control dressPut 212 the oxygen from described oxygen supply source 211 103 is adjusted into identical with described hot blast 101Temperature, by described oxygen conveying device 213, via described spray gun 214 for oxygen concentration, supplyBe given to described blowpipe 117. Thus, described pulverized coal injection into blast furna 11 preheatings are caught fire, at this blowpipe 117Front end form flame, burn in district in convolution, with the described raw material 1 in described blast furnace main body 110In coke etc. react, generate reducibility gas. Thus, the iron ore quilt in described raw material 1Reduction, forms the pig iron (molten iron) 2, takes out from described tapping hole 110a. In addition described hot blast,The oxygen concentration summation of 101 oxygen concentration and described oxygen is for example adjusted into 28%.
In addition, due to after hot blast 101 is the fusion point of ash of measuring in advance in pulverized coal injection into blast furna 11, temperatureDegree is not adjusted to respect to being delivered to blowpipe 117 after low 100~150 DEG C of this fusion point of ash, therefore notThere will be ash (blast furnace blowing coal ash) melting of pulverized coal injection into blast furna 11 and be attached to spray gun 129 and drumThe situation of air port 118 inner surfaces. , can suppress blast furnace blowing coal ash and be attached to pulverized coal injection into blast furna11 lead on the passage of blast furnace main body 110 inside or passage are stopped up. Therefore, blast-furnace equipment 200Can stable operation.
For this reason, only use grey softening point adjustment to process to more than 1300 DEG C coal dusts even if do not adoptMethod, or coal powder blowing amount is when very big, adjusts the composition of coal dust and the method for particle diameter, also canInhibition blast furnace blowing coal ash is attached to pulverized coal injection into blast furna and leads on the passage of blast furnace body interior or incite somebody to actionPassage stops up.
Therefore, by present embodiment, can be using the cheap grizzle such as ub-bituminous coal, brown coal as heightStove injection coal 11 uses, and without the bituminous coal etc. that uses high price, thereby can reduce the system of the pig iron 2Cause this.
And, because oxygen concentration is arranged on blowpipe 117 with spray gun 214, thus with only to spray gun117 situations of supplying with the above-mentioned embodiment of hot blast 101 are compared, and the oxygen that can reduce hot blast 101 is denseDegree, correspondingly carries out oxygen concentration with oxygen concentration spray gun 214, therefore can postpone blast furnace blowingThe burning time started of coal 11. Thus, can suppress more effectively blast furnace blowing coal ash is attached toPulverized coal injection into blast furna leads on the passage of blast furnace body interior or passage is stopped up.
Industrial applicibility
Pig iron manufacture method of the present invention and for the blast-furnace equipment of the method, can suppress blast furnace blowingCoal ash is attached to pulverized coal injection into blast furna and leads on the passage of blast furnace body interior or by passage obstruction, andCan reduce pig iron manufacturing cost, therefore in ironworker's industry processed, have useful value.
Symbol description
1 raw material
2 pig iron (molten iron)
11 pulverized coal injection into blast furna
100,200 blast-furnace equipments
101 hot blasts
102 nitrogen
103 oxygen
110 blast furnace main bodys
110a tapping hole
110b outer wall
110c heat-insulating material
111 raw material quantitative feedwaies
112 charge conveyors
113 furnace roof hoppers
114 warm-air supply sources
115 hot blast temperature control device
116 hot-blast conveying appliances
117 blowpipes
118 blast orifices
118a base end part
120 feeding hoppers
121 conveyer belts
122 receive hopper
123 coal pulverizers
124 nitrogen gas supply sources
125 transfer lines
126 cyclone separators
127 accumulate hopper
128 winding-up tanks
129 spray guns
211 oxygen supply sources
212 oxygen temperature control device
213 oxygen conveying devices
214 oxygen concentration spray guns
214a leading section

Claims (5)

1. a pig iron manufacture method, its by by the raw material that contains iron ore and coal from blast furnace mainThe top of body packs inside into, and from the blast orifice of this blast furnace main body to inner blowing hot air and blast furnace blowingCoal, with the raw material iron ore manufacture pig iron,
It is characterized in that,
Described pulverized coal injection into blast furna is, the oxygen atom content ratio of butt is 10wt%~20wt%,
Average pore diameter is the pulverized coal injection into blast furna of 10nm~50nm,
Measure in advance the fusion point of ash in described pulverized coal injection into blast furna,
And the temperature of described hot blast is adjusted to the temperature with respect to low 100~150 DEG C of described fusion point of ashDegree.
2. pig iron manufacture method according to claim 1, is characterized in that,
Described blast orifice in described blast furnace main body carries out oxygen concentration to described hot blast.
3. a blast-furnace equipment, it comprises: blast furnace main body;
The raw material that contains iron ore and coal is packed into inner raw material dress from described blast furnace main body topEnter mechanism;
Hot blast spraying and blowing organ from from the blast orifice of described blast furnace main body to inner blowing hot air; And
The pulverized coal injection into blast furna of winding-up pulverized coal injection into blast furna from the described blast orifice of described blast furnace main body to insideFeed mechanism,
It is characterized in that,
Described pulverized coal injection into blast furna feed mechanism
Oxygen atom content ratio for the butt of jetting is that 10~20wt%, average pore diameter areThe pulverized coal injection into blast furna of 10~50nm,
Described hot blast spraying and blowing organ
For measuring in advance the fusion point of ash of described raw material, and the temperature of jetting is adjusted to respect to describedThe described hot blast that fusion point of ash is low 100~150 DEG C.
4. blast-furnace equipment according to claim 3, is characterized in that,
Also there is the oxygen that at the described blast orifice of described blast furnace main body, described hot blast is carried out oxygen concentrationGas enrichment mechanism.
5. blast-furnace equipment according to claim 4, is characterized in that,
Described oxygen concentration mechanism has the spray gun of described oxygen circulation,
The leading section of described spray gun is configured in the base end part side of the described blast orifice of more described blast furnace main bodyThe position of the private side of more close this blast furnace main body.
CN201380035116.2A 2012-08-13 2013-04-25 Pig iron manufacture method and for the blast-furnace equipment of the method Expired - Fee Related CN104411837B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2012179239A JP5958935B2 (en) 2012-08-13 2012-08-13 Pig iron manufacturing method and blast furnace equipment used therefor
JP2012-179239 2012-08-13
PCT/JP2013/062157 WO2014027481A1 (en) 2012-08-13 2013-04-25 Method for producing pig iron, and blast furnace to be used therefor

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Publication Number Publication Date
CN104411837A CN104411837A (en) 2015-03-11
CN104411837B true CN104411837B (en) 2016-05-18

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