CN104411837A - Method for producing pig iron, and blast furnace to be used therefor - Google Patents
Method for producing pig iron, and blast furnace to be used therefor Download PDFInfo
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- CN104411837A CN104411837A CN201380035116.2A CN201380035116A CN104411837A CN 104411837 A CN104411837 A CN 104411837A CN 201380035116 A CN201380035116 A CN 201380035116A CN 104411837 A CN104411837 A CN 104411837A
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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
- C21B7/163—Blowpipe assembly
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
- Blast Furnaces (AREA)
Abstract
Provided is a blast furnace capable of reducing the production costs of pig iron, and suppressing the adhesion of blast-furnace-blowing-coal ash and blockages caused by blast-furnace-blowing-coal ash along the path of the blast-furnace blowing coal to the interior of the blast-furnace body. A blast furnace (100) is equipped with: a blast-furnace body (110); material-insertion means (111-113) for inserting a material (1) containing iron ore and coal into the interior of the blast-furnace body from the top section thereof; hot-air blowing means (114, 115) for blowing hot air (101) into the interior of the blast-furnace body through the tuyere thereof; and blast-furnace-blowing-coal supply means (120-129) for blowing blast-furnace-blowing coal (11) into the interior of the blast-furnace body through the tuyere thereof. Therein, the blast-furnace-blowing-coal supply means blow a blast-furnace blowing coal having the proportion of oxygen atoms contained therein (dry base) set to 10-20 wt%, and the average pore diameter set to 10-50nm, while the hot-air blowing means measure the melting point of the ash in the material in advance, and blow hot air which is 100-150 DEG C lower than the melting point of the ash.
Description
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 loading inner by raw materials such as iron ore, Wingdale and coke from blast furnace body top, and from this blast furnace body side blast orifice blowing hot air on the lower and the pulverized coal injection into blast furna (coal dust) as auxiliary fuel, the pig iron can be produced with iron ore.
But, in order to stably run described blast-furnace equipment, need to suppress blast furnace blowing coal ash to be attached to pulverized coal injection into blast furna on the passage of blast furnace body interior or by channel blockage.
Dealer is had to propose such as by adding the CaO such as Wingdale, serpentine class slag former in the softening temperature of the ash of coal dust is lower than the coal dust of 1300 DEG C, by the softening temperature of the ash in coal dust adjustment process to more than 1300 DEG C, then the coal dust being only more than 1300 DEG C the softening temperature of the ash in coal dust is internally jetted from the blast orifice of high furnace main body, improve the combustible method (for example, referring to following patent documentation 1) of pulverized coal injection into blast furna.
In addition, dealer is also had to propose a kind of blast-furnace coal powder injection operational method, make it more nonflammable by the composition, particle diameter etc. that such as increase and decrease Rich Oxygen Amount or adjustment coal dust, be reduced in the accessible top temperature of raceway zone, even if in the great operation of coal powder blowing amount, also air permeability (for example, referring to following patent documentation 2) can be improved.
Prior art document
Patent documentation
Patent documentation 1: Japanese Patent Laid-Open 5-156330 publication
(paragraph [0014]-[0023], [Fig. 1] etc. for example, referring to specification sheets)
Patent documentation 2: Japanese Patent Laid-Open 11-152508 publication
Summary of the invention
The problem that invention quasi-solution is determined
But the blast-furnace coal powder injection method recorded in described patent documentation 1 only uses by adding above-mentioned slag former, by the softening temperature of ash adjustment process to the coal dust of more than 1300 DEG C, running cost is therefore caused to increase.
In addition, the blast-furnace coal powder injection operational method recorded in described patent documentation 2, its coal powder blowing amount is very big, needs the composition, the particle diameter that specially adjust coal dust, running cost therefore still can be caused to increase.
In view of this, the present invention is made for solving above-mentioned problem, object is to provide a kind of pig iron manufacture method and the blast-furnace equipment for the method, it can suppress blast furnace blowing coal ash to be attached to pulverized coal injection into blast furna on the passage of blast furnace body interior or by channel blockage, and can reduce pig iron manufacturing cost.
The means of dealing with problems
Solve the pig iron manufacture method of the 1st invention of above-mentioned problem, it is by loading inner by the raw material containing iron ore and coal from blast furnace body top, and from blast orifice internally blowing hot air and the pulverized coal injection into blast furna of this high furnace main body, raw material iron ore is used to manufacture the pig iron, it is characterized in that, described pulverized coal injection into blast furna is, oxygen atom content ratio (butt) is 10wt% ~ 20wt%, average pore diameter is the pulverized coal injection into blast furna of 10nm ~ 50nm, measure the fusion point of ash in described pulverized coal injection into blast furna in advance, the temperature of described hot blast is adjusted to the temperature of low relative to described fusion point of ash 100 ~ 150 DEG C.
The pig iron manufacture method solving the 2nd invention of above-mentioned problem is: a kind of pig iron manufacture method of above-mentioned 1st invention, is characterized in that, carry out oxygen concentration at the described blast orifice of described high furnace main body to described hot blast.
Solve the blast-furnace equipment of the 3rd invention of above-mentioned problem, it comprises: high furnace main body; Raw material containing iron ore and coal is loaded inner raw material loading mechanism from described blast furnace body top; From the hot blast spraying and blowing organ of the blast orifice of described high furnace main body internally blowing hot air; And the pulverized coal injection into blast furna feed mechanism of pulverized coal injection into blast furna of internally jetting from the described blast orifice of described high furnace main body, it is characterized in that, for jetting, oxygen atom content ratio (butt) is 10 ~ 20wt% to described pulverized coal injection into blast furna feed mechanism, average pore diameter is the pulverized coal injection into blast furna of 10 ~ 50nm, described hot blast spraying and blowing organ is used for measuring the fusion point of ash in described raw material in advance, and winding-up temperature is adjusted to the described hot blast after low relative to this fusion point of ash 100 ~ 150 DEG C.
The blast-furnace equipment solving the 4th invention of above-mentioned problem is: a kind of blast-furnace equipment of above-mentioned 3rd invention, it is characterized in that also possessing oxygen concentration mechanism, this oxygen concentration mechanism carries out oxygen concentration at the described blast orifice of described high furnace main body to described hot blast.
The blast-furnace equipment solving the 5th invention of above-mentioned problem is: a kind of blast-furnace equipment of above-mentioned 4th invention, it is characterized in that, described oxygen concentration mechanism has the spray gun of described oxygen circulation, and the leading section of described spray gun is configured in the position of base end part side closer to the private side of this high furnace main body of the described blast orifice of more described high furnace main body.
Invention effect
According to pig iron manufacture method of the present invention and the blast-furnace equipment for the method, owing to being be 10 ~ 20wt% by oxygen atom content ratio (butt), average pore diameter is the pulverized coal injection into blast furna of 10 ~ 50nm, i.e. oxygen-containing functional group (carboxyl, aldehyde radical, ester group, hydroxyl etc.) etc. tar generate base depart from and significantly reduce, but main framing is (with C, H, combusting component centered by O) the pulverized coal injection into blast furna that significantly suppressed of decomposition (minimizing), the hot blast being adjusted to low relative to the ash fusion point of this pulverized coal injection into blast furna 100 ~ 150 DEG C along with temperature is jetted to blast furnace body interior together, therefore the temperature of hot blast becomes lower than the fusion point of ash in pulverized coal injection into blast furna, blast furnace blowing coal ash can be suppressed to be attached to pulverized coal injection into blast furna on the passage of blast furnace body interior or by channel blockage.Thus, blast-furnace equipment can stably run.Further because the ash in described pulverized coal injection into blast furna and described hot blast be together blown into blast furnace body interior but can not melting, so the grizzles such as the sub-bituminous coal of cheapness, brown coal can be used as pulverized coal injection into blast furna, thus pig iron manufacturing cost can be reduced.
Accompanying drawing explanation
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 view of major portion in Fig. 2.
Embodiment
Below based on accompanying drawing to pig iron manufacture method of the present invention and be described for the embodiment of the blast-furnace equipment of the method, but the present invention is not limited only to the following embodiment that illustrates based on accompanying drawing.
(the first embodiment)
First embodiment of pig iron manufacture method of the present invention and the blast-furnace equipment for the method is described based on Fig. 1 below.
As shown in Figure 1, weight feed contains the raw material quantitative feedway 111 of the raw material 1 of iron ore and coke, contacts with the carrying direction upstream side of the charge conveyor 112 of this raw material 1 of carrying.Contact above the downstream side, carrying direction of this charge conveyor 112 and the furnace roof hopper 113 at high furnace main body 110 top.The hot-blast conveying appliance 116 of heat air delivery 101 is connected with the blowpipe 117 of the blast orifice 118 being arranged at described high furnace main body 110.
In addition, the feeding hopper 120 of supply pulverized coal injection into blast furna 11 is equipped near described high furnace main body 110.
The oxygen atom content ratio (butt) of described pulverized coal injection into blast furna 11 is 10 ~ 18wt%, and average pore diameter is 10 ~ 50nm (preferably 20 ~ 50nm).
Above-mentioned pulverized coal injection into blast furna 11 is by by sub-bituminous coal, grizzle (the oxygen atom content ratio (butt): more than 18wt% of the ash fusion points such as brown coal usual lower (such as 1200 DEG C), average pore diameter: 3 ~ 4nm) in low-oxygen environment (oxygen concn: below 5v/v%) carry out heating (110 ~ 200 DEG C × 0.5 ~ 1 hour), dry, after removing moisture, (oxygen concn: below 2v/v%) heating in low-oxygen environment (460 ~ 590 DEG C (preferably 500 ~ 550 DEG C) × 0.5 ~ 1 hour), destructive distillation, by water, carbonic acid gas and tar fraction etc. are removed with the form of carbonization gas and empyreumatic oil, then in low-oxygen environment, (oxygen concn: below 2v/v%) cools the method for (less than 50 DEG C), the material that can easily manufacture.
The bottom of described feeding hopper 120 and the base end side of travelling belt 121 contact, and this travelling belt 121 is carried from the described pulverized coal injection into blast furna 11 in this feeding hopper 120.The front of described travelling belt 121 contacts with the top of the reception hopper 122 receiving described pulverized coal injection into blast furna 11.
The bottom of described reception hopper 122 is connected with the top receiving port of coal pulverizer 123, and the described pulverized coal injection into blast furna 11 from this reception hopper 122 is ground into specified diameter size (such as, less than 80 μm) by this coal pulverizer 123.Be connected with nitrogen gas supply source 124 below the side of described coal pulverizer 123, this nitrogen gas supply source 124 supplies inert nitrogen gas 102.The top of described coal pulverizer 123 is connected with the base end side of transfer line 125, and the described pulverized coal injection into blast furna 11 pulverized is carried out strength carrying by described nitrogen 102 by this transfer line 125.
The front of described transfer line 125 connects with the cyclonic separator (or deep bed filter) 126 be separated with described nitrogen 102 by described pulverized coal injection into blast furna 11.The below of described cyclonic separator 126 contacts with the top of the accumulation hopper 127 accumulating described pulverized coal injection into blast furna 11.The bottom of described accumulation hopper 127 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.The top of described winding-up tank 128 is connected with the spray gun 129 being connected to described blowpipe 117, by supplying described nitrogen 102 from described nitrogen gas supply source 124 in this winding-up tank 128, strength carrying can be carried out to supply to the described pulverized coal injection into blast furna 11 of this winding-up tank 128 inside, be supplied in above-mentioned blowpipe 117 from above-mentioned spray gun 129.
Above-mentioned hot-blast conveying appliance 116 is connected with hot blast temperature control device 115.Hot blast temperature control device 115 is connected with warm-air supply source 114.Hot blast temperature control device 115, the fusing point of the ash (blast furnace blowing coal ash) of this pulverized coal injection into blast furna 11 obtained according to the fusing point of the ash (blast furnace blowing coal ash) measuring above-mentioned pulverized coal injection into blast furna 11 in advance, the hot blast of Self-air-heating supply source 114 is adjusted to the temperature of low relative to this fusion point of ash 100 ~ 150 DEG C in the future.Such as, when the fusing point of the ash (blast furnace blowing coal ash) of above-mentioned pulverized coal injection into blast furna 11 is 1200 DEG C, hot blast is adjusted to 1050 ~ 1100 DEG C by hot blast temperature control device 115.
In addition, in Fig. 1,110a is used to the iron notch taking out liquid pig iron (molten iron) 2.
In present embodiment described above, described raw material quantitative feedway 111, described charge conveyor 112, described furnace roof hopper 113 etc. constitutes raw material loading mechanism, described warm-air supply source 114, described hot blast temperature control device 115, described hot-blast conveying appliance 116, described blowpipe 117 etc. constitutes hot blast spraying and blowing organ, described feeding hopper 120, described travelling belt 121, described reception hopper 122, described coal pulverizer 123, described nitrogen gas supply source 124, described transfer line 125, described cyclonic separator 126, described accumulation hopper 127, described winding-up tank 128, described spray gun 129, described blowpipe 117 etc. constitutes pulverized coal injection into blast furna feed mechanism.Described hot blast temperature control device 115 etc. constitutes hot blast temperature controlling organization.
Then, for using the pig iron manufacture method of above-mentioned blast-furnace equipment 100 to be described.
In addition, coal ash (blast furnace blowing coal ash) fusing point of described pulverized coal injection into blast furna 11 will measure in advance.
When described in described raw material quantitative feedway 111 weight feed during raw material 1, this raw material 1 is supplied in described furnace roof hopper 113 by described charge conveyor 112, and is loaded in described high furnace main body 110.
Meanwhile, when described pulverized coal injection into blast furna 11 being dropped into described feeding hopper 120 and being inner, this pulverized coal injection into blast furna 11 is supplied to described reception hopper 122 by described travelling belt 121, is then ground into specified diameter size (such as, less than 80 μm) at described coal pulverizer 123.
Then, when supplying described nitrogen 102 from described nitrogen gas supply source 124, the described pulverized coal injection into blast furna 11 pulverized is carried by described nitrogen 102 strength, by described transfer line 125, be carried in described cyclonic separator 126, after being separated with described pulverized coal injection into blast furna 11, be discharged to outside system.
At the isolated described pulverized coal injection into blast furna 11 of described cyclonic separator 126, accumulated in after in described accumulation hopper 127, be supplied in described winding-up tank 128, be carried to described spray gun 129 by described nitrogen 102 strength from described nitrogen gas supply source 124, be then supplied to the inside of described blowpipe 117.
Then, from described hot-blast conveying appliance 116 to described blowpipe 117 with the gas velocity of such as 240m/s supply hot blast 101, the temperature of this hot blast 101 is adjusted to low 100 ~ 150 DEG C relative to the fusing point of the ash (blast furnace blowing coal ash) of described pulverized coal injection into blast furna 11, the preheating of described pulverized coal injection into blast furna 11 is made to catch fire thus, flame is formed in the front end of this blowpipe 117, in raceway zone combustion, react with the coke etc. in the described raw material 1 in described high furnace main body 110, generate reducing gas.Thus, the iron ore in described raw material 1 is reduced and becomes the pig iron (molten iron) 2, takes out from described iron notch 110a.In addition, the oxygen concentration of described hot blast 101 is adjusted to such as 28%.
Herein, the average pore diameter of above-mentioned pulverized coal injection into blast furna 11 is 10 ~ 50nm, namely the tar such as oxygen-containing functional group (carboxyl, aldehyde radical, ester group, hydroxyl) generates base and departs from and significantly reduce, but oxygen atom content ratio (butt) is 10 ~ 18wt%, namely the decomposition (minimizing) of main framing (combusting component centered by C, H, O) is significantly suppressed.
Thus, when above-mentioned pulverized coal injection into blast furna 11 is together blown into the inside of described high furnace main body 110 with described hot blast 101, owing to containing many Sauerstoffatoms in main framing, and pore diameter is large, so not only make the oxygen of described hot blast 101 easily internally spread, and pole difficult labour green coke oil, therefore substantially can not produce unburned carbon (carbon black), can perfect combustion.
In addition, to blowpipe 117 carry hot blast 101 be measure the fusion point of ash in pulverized coal injection into blast furna 11 in advance after, temperature is adjusted to the hot blast of low relative to this fusion point of ash 100 ~ 150 DEG C, therefore there will not be (blast furnace blowing coal ash) melting of the ash of pulverized coal injection into blast furna 11 and is attached to the situation of spray gun 129 and blast orifice 118 internal surface.That is, blast furnace blowing coal ash can be suppressed to be attached to pulverized coal injection into blast furna 11 on the passage of high furnace main body 110 inside or by channel blockage.Therefore blast-furnace equipment 100 can stably run.
So, even if do not adopt the softening temperature only using ash to adjust the method for process to the coal dust of more than 1300 DEG C, or when coal powder blowing amount is very big, the adjustment composition of coal dust and the method for particle diameter, also can suppress blast furnace blowing coal ash to be attached to pulverized coal injection into blast furna on the passage of blast furnace body interior or by channel blockage.
Therefore, adopt present embodiment, the grizzles such as the sub-bituminous coal of cheapness, brown coal can be used as pulverized coal injection into blast furna 11, and without the need to using the bituminous coal etc. of high price, the manufacturing cost of the pig iron 2 can be reduced.
In addition, in described pulverized coal injection into blast furna 11, average pore diameter is necessary for 10 ~ 50nm (preferably 20 ~ 50nm).Because if diameter is lower than 10nm, then the oxygen in hot blast 101 not easily internally spreads, and incendivity can be caused to decline; On the other hand, if diameter is more than 50nm, then easily broken and become finely powdered.After being blown into high furnace main body 110 inside, if broken and become finely powdered, then can take advantage of the air-flow of gas directly through the inside of high furnace main body 110, just be discharged without burning.
In addition, in described pulverized coal injection into blast furna 11, oxygen atom content ratio (butt) also must at more than 10wt%.Because if lower than 10wt%, then when not containing oxygenant or when not carrying out oxygen concentration to hot blast, be difficult to make its perfect combustion.
Incidentally, when 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 then difficult to make the tar such as oxygen-containing functional group generate base and depart from completely from described grizzle, and it is also very difficult that average pore diameter will be made to reach 10 ~ 50nm; On the other hand, if more than 590 DEG C, then the main framing of described grizzle (combusting component centered by C, H, O) can be made to start obviously to decompose, cause combusting component very few.
(the second embodiment)
Second embodiment of pig iron manufacture method of the present invention and the blast-furnace equipment for the method is described based on Fig. 2 and Fig. 3 below.In addition, for the part identical with above-mentioned embodiment situation, use the symbol identical with the symbol used in the explanation of above-mentioned embodiment, and omit the explanation repeated with the explanation in above-mentioned embodiment.
The blast-furnace equipment 200 of present embodiment, as shown in Figures 2 and 3, has the oxygen concentration spray gun 214 being connected to blowpipe 117 and arranging.The oxygen concentration cardinal extremity of spray gun 214 is connected with oxygen conveying device 213.Oxygen conveying device 213 is connected with oxygen temperature control device 212.Oxygen temperature control device 212 is connected with oxygen supply source 211.
The leading section 214a of oxygen concentration spray gun 214 is positioned at the position of base end part 118a closer to high furnace main body 110 private side of the blast orifice 118 of higher furnace main body 110.Thus, oxygen concentration can be carried out to hot blast 101 near the blast orifice 118 of high furnace main body 110, and the burning time opening of pulverized coal injection into blast furna 11 can be postponed.That is, the blast furnace blowing coal ash that pulverized coal injection into blast furna 11 burning can be suppressed to produce is attached in blowpipe 117 or is blocked by blowpipe.
So, in the present embodiment, described oxygen supply source 211, described oxygen temperature control device 212, described oxygen conveying device 213, described oxygen concentration spray gun 214 etc. constitute oxygen concentration mechanism.
Then, to using the pig iron manufacture method of above-mentioned blast-furnace equipment 200 to be described.
In addition, coal ash (blast furnace blowing coal ash) fusing point of described pulverized coal injection into blast furna 11 will measure in advance.
Identical with above-mentioned embodiment, by described pulverized coal injection into blast furna 11 via described feeding hopper 120, described travelling belt 121, described reception hopper 122, described coal pulverizer 123, described cyclonic separator 126, described accumulation hopper 127, be supplied in described winding-up tank 128, be carried to described spray gun 129 by described nitrogen 102 strength from described nitrogen gas supply source 124 again, be supplied to the inside of described blowpipe 117.
Then, by described hot blast temperature control device 115, the temperature of the hot blast 101 from described warm-air supply source 114 is adjusted to the temperature of low 100 ~ 150 DEG C of the fusing point of the ash (blast furnace blowing coal ash) relative to described pulverized coal injection into blast furna 11, hot blast 101 is supplied to described blowpipe 117 with the gas velocity of such as 240m/s by described hot-blast conveying appliance 116, and by described oxygen temperature control device 212, the oxygen 103 from described oxygen supply source 211 is adjusted to the temperature identical with described hot blast 101, by described oxygen conveying device 213, via described oxygen concentration spray gun 214, be supplied to described blowpipe 117.Thus, the preheating of described pulverized coal injection into blast furna 11 is caught fire, form flame in the front end of this blowpipe 117, in raceway zone combustion, react with the coke etc. in the described raw material 1 in described high furnace main body 110, generate reducing gas.Thus, the iron ore in described raw material 1 is reduced, and forms the pig iron (molten iron) 2, takes out from described iron notch 110a.In addition, the oxygen concn of described hot blast 101 and the oxygen concn summation of described oxygen are adjusted to such as 28%.
In addition, due to hot blast 101 be measure the fusion point of ash in pulverized coal injection into blast furna 11 in advance after, temperature is delivered to blowpipe 117 after being adjusted to low relative to this fusion point of ash 100 ~ 150 DEG C, therefore there will not be (blast furnace blowing coal ash) melting of the ash of pulverized coal injection into blast furna 11 and be attached to the situation of spray gun 129 and blast orifice 118 internal surface.That is, blast furnace blowing coal ash can be suppressed to be attached to pulverized coal injection into blast furna 11 on the passage of high furnace main body 110 inside or by channel blockage.Therefore, blast-furnace equipment 200 can steady running.
For this reason, even if do not adopt the softening temperature only using ash to adjust the method for process to the coal dust of more than 1300 DEG C, or when coal powder blowing amount is very big, the adjustment composition of coal dust and the method for particle diameter, also can suppress blast furnace blowing coal ash to be attached to pulverized coal injection into blast furna on the passage of blast furnace body interior or by channel blockage.
Therefore, by present embodiment, the grizzles such as the sub-bituminous coal of cheapness, brown coal can be used as pulverized coal injection into blast furna 11, and without the need to using the bituminous coal etc. of high price, thus the manufacturing cost of the pig iron 2 can be reduced.
And, because oxygen concentration spray gun 214 is arranged on blowpipe 117, so with only supply to spray gun 117 hot blast 101 above-mentioned embodiment situation compared with, the oxygen concn of hot blast 101 can be reduced, correspondingly carry out oxygen concentration with oxygen concentration spray gun 214, therefore, it is possible to postpone the burning time opening of pulverized coal injection into blast furna 11.Thereby, it is possible to suppress blast furnace blowing coal ash to be attached to pulverized coal injection into blast furna on the passage of blast furnace body interior or by channel blockage more effectively.
Industrial applicibility
Pig iron manufacture method of the present invention and the blast-furnace equipment for the method, blast furnace blowing coal ash can be suppressed to be attached to pulverized coal injection into blast furna on the passage of blast furnace body interior or by channel blockage, and pig iron manufacturing cost can be reduced, therefore in ironworker's industry processed, have useful utility value.
Nomenclature
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 high furnace main bodies
110a iron notch
110b outer wall
110c thermal insulation 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 travelling belts
122 receive hopper
123 coal pulverizers
124 nitrogen gas supply sources
125 transfer lines
126 cyclonic 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, it is inner by being loaded from the top of high furnace main body by the raw material containing iron ore and coal, and from blast orifice internally blowing hot air and the pulverized coal injection into blast furna of this high furnace main body, with the raw material iron ore manufacture pig iron,
It is characterized in that,
Described pulverized coal injection into blast furna is, oxygen atom content ratio (butt) is 10wt% ~ 20wt%,
Average pore diameter is the pulverized coal injection into blast furna of 10nm ~ 50nm,
Measure the fusion point of ash in described pulverized coal injection into blast furna in advance,
And the temperature of described hot blast is adjusted to the temperature of low relative to described fusion point of ash 100 ~ 150 DEG C.
2. pig iron manufacture method according to claim 1, is characterized in that,
At the described blast orifice of described high furnace main body, oxygen concentration is carried out to described hot blast.
3. a blast-furnace equipment, it comprises: high furnace main body;
Raw material containing iron ore and coal is loaded inner raw material loading mechanism from described blast furnace body top;
From the hot blast spraying and blowing organ of the blast orifice of described high furnace main body internally blowing hot air; And
Internally to jet from the described blast orifice of described high furnace main body the pulverized coal injection into blast furna feed mechanism of pulverized coal injection into blast furna,
It is characterized in that,
Described pulverized coal injection into blast furna feed mechanism
For jetting, oxygen atom content ratio (butt) is 10 ~ 20wt%, average pore diameter is the pulverized coal injection into blast furna of 10 ~ 50nm,
Described hot blast spraying and blowing organ
For measuring the fusion point of ash in described raw material in advance, and temperature of jetting is adjusted to the described hot blast of low relative to described fusion point of ash 100 ~ 150 DEG C.
4. blast-furnace equipment according to claim 3, is characterized in that,
The described blast orifice also had at described high furnace main body carries out the oxygen concentration mechanism of oxygen concentration to described hot blast.
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 position of base end part side closer to the private side of this high furnace main body of the described blast orifice of more described high furnace main body.
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104411837A true CN104411837A (en) | 2015-03-11 |
| CN104411837B CN104411837B (en) | 2016-05-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380035116.2A Expired - Fee Related CN104411837B (en) | 2012-08-13 | 2013-04-25 | Pig iron manufacture method and for the blast-furnace equipment of the method |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20150176096A1 (en) |
| JP (1) | JP5958935B2 (en) |
| KR (1) | KR101648683B1 (en) |
| CN (1) | CN104411837B (en) |
| IN (1) | IN2015DN00505A (en) |
| WO (1) | WO2014027481A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5848363B2 (en) * | 2012-01-18 | 2016-01-27 | 三菱重工業株式会社 | Blast furnace equipment |
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- 2013-04-25 CN CN201380035116.2A patent/CN104411837B/en not_active Expired - Fee Related
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20150020248A (en) | 2015-02-25 |
| JP2014037559A (en) | 2014-02-27 |
| IN2015DN00505A (en) | 2015-06-26 |
| WO2014027481A1 (en) | 2014-02-20 |
| CN104411837B (en) | 2016-05-18 |
| KR101648683B1 (en) | 2016-08-16 |
| JP5958935B2 (en) | 2016-08-02 |
| US20150176096A1 (en) | 2015-06-25 |
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