EP2796566B1 - Blast furnace operation method - Google Patents
Blast furnace operation method Download PDFInfo
- Publication number
- EP2796566B1 EP2796566B1 EP12860851.0A EP12860851A EP2796566B1 EP 2796566 B1 EP2796566 B1 EP 2796566B1 EP 12860851 A EP12860851 A EP 12860851A EP 2796566 B1 EP2796566 B1 EP 2796566B1
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- Prior art keywords
- pulverized coal
- blast furnace
- operation method
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- notches
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- 238000000034 method Methods 0.000 title claims description 68
- 239000003245 coal Substances 0.000 claims description 218
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 126
- 239000001301 oxygen Substances 0.000 claims description 126
- 229910052760 oxygen Inorganic materials 0.000 claims description 126
- 239000007789 gas Substances 0.000 claims description 98
- 239000012159 carrier gas Substances 0.000 claims description 33
- 229910000805 Pig iron Inorganic materials 0.000 claims description 32
- 239000000571 coke Substances 0.000 claims description 18
- 239000000428 dust Substances 0.000 claims description 12
- 239000003473 refuse derived fuel Substances 0.000 claims description 12
- 239000004033 plastic Substances 0.000 claims description 8
- 229920003023 plastic Polymers 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 8
- 238000007664 blowing Methods 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 description 53
- 239000006185 dispersion Substances 0.000 description 31
- 238000002474 experimental method Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 11
- 229910002092 carbon dioxide Inorganic materials 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000002028 Biomass Substances 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 230000036284 oxygen consumption Effects 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 3
- 239000003830 anthracite Substances 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
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- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- -1 that is Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
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Images
Classifications
-
- 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
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
- C21B7/163—Blowpipe assembly
-
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
-
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/168—Introducing a fluid jet or current into the charge through a lance
- F27D2003/169—Construction of the lance, e.g. lances for injecting particles
Definitions
- the present invention relates to a method for operating a blast furnace that includes injecting pulverized coal through a blast furnace tuyere to increase the combustion temperature, thereby improving productivity and reducing CO 2 emissions.
- Patent Literature 1 discloses that the combustion efficiency can be improved by using pulverized coal having a volatile matter content of 25 mass% or less at a pulverized coal ratio of 150 kg/t-pig iron or more, supplying the pulverized coal and oxygen to a lance for injecting a fuel through a tuyere, and increasing the oxygen concentration in the lance to 70% by volume or more.
- Patent Literature 1 it is also proposed in Patent Literature 1 that in the case of a single-tube lance a mixture of oxygen and pulverized coal is injected through the single-tube lance, and in the case of a double wall lance pulverized coal is injected through an inner tube of the double wall lance, and oxygen is injected through an outer tube of the double wall lance.
- the pulverized coal ratio is the mass of pulverized coal used per ton of pig iron.
- Patent Literature 2 discloses that a reaction between pulverized coal and oxygen is promoted by dispersing the pulverized coal utilizing asperities formed on an outer tube of a double wall lance.
- Patent Literature 3 discloses that in a double wall lance for injecting pulverized coal through an inner tube thereof and oxygen through an outer tube thereof the contact between pulverized coal and oxygen is improved by shortening the inner tube relative to the outer tube, that is, placing a pulverized coal injecting front end of the inner tube upstream from an oxygen injecting front end of the outer tube in the injecting direction.
- JP 2000 192119 A describing a blowing method of auxiliary fuel into a blast furnace by which the auxiliary fuel is blown into the blast furnace from an auxiliary fuel blowing tuyere. Further related art may also be found in CN 102 268 496 A .
- a gas flowing through an outer tube of a double wall lance also functions to cool the outer tube.
- an obstacle that interferes with the gas flow such as the asperities formed on the outer tube in Patent Literature 2
- a heat load is applied to a slow flow region, possibly causing wear damage, such as cracking or a melting loss.
- wear damage may induce backfire or clogging of a lance.
- An increase in the amount of pulverized coal inevitably causes a problem of abrasion of a raised portion due to pulverized coal injected through an inner tube.
- Patent Literature 3 Although shortening the front end of the inner tube of the double wall lance relative to the outer tube of the double wall lance as described in Patent Literature 3 may improve the contact between pulverized coal and oxygen, an oxygen flow suppresses the dispersion of pulverized coal, and the combustibility of pulverized coal is not sufficiently improved.
- the present invention has paid attention to these problems and aims to provide a blast furnace operation method for increasing the combustion temperature and thereby reducing CO 2 emissions.
- the present invention provides a blast furnace operation method described below.
- the method includes injecting pulverized coal together with a carrier gas through an inner tube of the double wall lance, injecting a combustion-supporting gas through an outer tube of the double wall lance, and forming notches in a injecting front end of the inner tube of the double wall lance, wherein the concentration of oxygen in a gas composed of the carrier gas and the combustion-supporting gas in the double wall lance is 35% by volume or more.
- the combustion temperature can be increased, and consequently CO 2 emissions can be reduced.
- the pulverized coal ratio is 170 kg/t or more
- the specific consumption of a combustion-supporting gas, such as oxygen can be reduced by decreasing the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas in the double wall lance to less than 70% by volume.
- the notches circumferentially evenly spaced in the front end of the inner tube of the double wall lance improve the diffusion of pulverized coal and the combustion-supporting gas and further improve combustion efficiency.
- Injecting part of oxygen for enrichment into a blast as a combustion-supporting gas through the outer tube of the double wall lance can prevent excess oxygen supply without disturbing the gas balance in the blast furnace.
- Fig. 1 is an overall view of a blast furnace to which a blast furnace operation method according to the present embodiment is applied.
- a tuyere 3 of a blast furnace 1 is coupled to a blow pipe 2 for blowing hot air, and a lance 4 is inserted in the blow pipe 2.
- a combustion space called a raceway 5 is disposed over a coke layer in front of the tuyere 3 in a hot air blowing direction. Combustion and gasification of a reducing material occur mainly in this combustion space.
- Fig. 2 illustrates the combustion state when only pulverized coal 6 is injected as a solid reducing material through the lance 4.
- the pulverized coal 6 is injected from the lance 4 into the raceway 5 through the tuyere 3.
- the volatile matter and fixed carbon of the pulverized coal 6 burn together with coke 7.
- an aggregate of carbon and ash which is generally called char, is discharged from the raceway as unburned char 8.
- the hot air velocity in front of the tuyere 3 in the hot air blowing direction is approximately 200 m/sec.
- An oxygen zone extends approximately 0.3 to 0.5 m from a front end of the lance 4 into the raceway 5.
- Fig. 3 illustrates the combustion mechanism in the case that only the pulverized coal (PC in the figure) 6 is injected into the blow pipe 2 through the lance 4.
- Particles of the pulverized coal 6 injected into the raceway 5 through the tuyere 3 are heated through radiative heat transfer from flames in the raceway 5.
- the temperature of the particles increases rapidly through radiative heat transfer and conductive heat transfer.
- the particles start to decompose at a temperature of 300°C or more.
- the volatile matter of the particles ignites and forms a flame.
- the combustion temperature reaches a temperature in the range of 1400°C to 1700°C.
- the char 8 remains. Since the char 8 is mainly composed of fixed carbon, a combustion reaction is accompanied by a carbon dissolution reaction, such as a solution-loss reaction or a hydrogen gas shift reaction.
- Fig. 4 illustrates the combustion mechanism in the case that the pulverized coal 6, together with a combustion-supporting gas oxygen 9, is injected into the blow pipe 2 through the lance 4.
- the pulverized coal 6 and the oxygen 9 are simply injected parallel to each other.
- a dash-dot-dot line in the figure indicates the combustion temperature in the case that only the pulverized coal is injected as illustrated in Fig. 3 .
- Simultaneous injecting of the pulverized coal and oxygen promotes mixing of the pulverized coal and oxygen in the vicinity of the lance and accelerates the combustion of the pulverized coal, thereby increasing the combustion temperature in the close vicinity of the lance.
- a combustion experiment was performed with a combustion experimental apparatus illustrated in Fig. 5 .
- Imitating the interior of a blast furnace an experiment furnace 11 is filled with coke, and the interior of a raceway 15 can be observed through an observation window.
- a lance 14 is inserted in a blow pipe 12.
- a hot air blown from an air-heating furnace to the blast furnace a hot air produced by a combustion burner 13 can be blasted into the experiment furnace 11 at a predetermined blast rate.
- the oxygen enrichment level of the blast air can be controlled with the blow pipe 12.
- One or both of pulverized coal and oxygen can be injected into the blow pipe 12 through the lance 14.
- An exhaust gas from the experiment furnace 11 is separated into an exhaust gas and dust in a separator 16 called cyclone.
- the exhaust gas is sent to an exhaust gas treatment system, such as an auxiliary combustion furnace.
- the dust is collected in a collecting box 17.
- the pulverized coal is composed of fixed carbon (FC) 71.4%, volatile matter (VM) 19.5%, and ash 9.1%.
- the blast conditions include a blast temperature of 1200°C, a flow rate of 300 Nm 3 /hr, a blast velocity of 130 m/sec at a front end of the tuyere, and an oxygen enrichment of 6% (an oxygen concentration of 27.0%, an enrichment of 6.0% relative to an oxygen concentration of 21% in air).
- the lance 14 was a double wall lance
- pulverized coal was injected through an inner tube of the double wall lance
- oxygen was injected as a combustion-supporting gas through an outer tube of the double wall lance.
- Pulverized coal was carried by a carrier gas.
- the carrier gas for pulverized coal was nitrogen.
- the solid-gas ratio of pulverized coal to a carrier gas for carrying pulverized coal ranges from 10 to 25 kg/Nm 3 in the case that a powder, that is, pulverized coal is carried by a small amount of gas (high concentration transport) or 5 to 10 kg/Nm 3 in the case that pulverized coal is carried by a large amount of gas (low concentration transport).
- the carrier gas may also be air.
- An experiment was conducted with a focus on variations in pulverized coal flow at a pulverized coal ratio in the range of 100 to 180 kg/t.
- oxygen was injected as a combustion-supporting gas, part of oxygen for enrichment was included in the blast so as not to change the total amount of oxygen blown into the furnace.
- the combustion-supporting gas may also be an oxygen-enriched air.
- the present inventors found the following in this experiment.
- a combustion-supporting gas that is, oxygen
- the combustion temperature is increased by increasing the oxygen concentration in an operation at a low pulverized coal ratio of less than 150 kg/t even if the pulverized coal has a volatile matter content of 25 mass% or less.
- the combustion temperature is not increased by increasing the oxygen concentration.
- the pulverized coal ratio is 150 kg/t or more, the combustion temperature levels off at an oxygen concentration of approximately 35% by volume.
- Fig. 6(a) illustrates the pulverized coal flow in an operation at a low pulverized coal ratio of less than 150 kg/t. Since the lance is a straight tube having a constant diameter in the experiment, the dispersion width of pulverized coal is substantially constant. The pulverized coal flow has a substantially uniform concentration within the dispersion width at such a low pulverized coal ratio. In an operation at a high pulverized coal ratio of 150 kg/t or more, however, as illustrated in Fig. 6(b) , pulverized coal is concentrated in the center of the dispersion width.
- pulverized coal in an operation at a high pulverized coal ratio of 170 kg/t or more, pulverized coal is highly concentrated in the center of the pulverized coal flow. Since oxygen is injected through the outer tube of the double wall lance, pulverized coal concentrated in the center of the pulverized coal flow does not come into contact with oxygen, and such unburned pulverized coal injected into the furnace interferes with aeration in the blast furnace. Even if the amount of oxygen blown is increased to promote contact with oxygen, when the amount of oxygen blown exceeds a certain threshold, as illustrated in Fig. 6(c) , the pulverized coal flow is further concentrated in the center of the surrounding oxygen flow. Thus, the contact with oxygen is not substantially promoted, and the combustion temperature levels off as described later.
- the pulverized coal 6 and the combustion-supporting gas oxygen 9 can diffuse through the notches 23 formed in the injecting front end of the inner tube 21 of the double wall lance 4 and come into contact with each other, thereby increasing the combustion temperature.
- pulverized coal 6 is concentrated in a central portion of a combustion-supporting gas oxygen 9. This results in poor contact between the pulverized coal 6 and the oxygen 9, and the combustion temperature levels off.
- the notches 23 formed in the inner tube 21 of the double wall lance 4 have no wear damage trouble.
- the combustion temperature levels off when the concentration of oxygen in a gas composed of the carrier gas for carrying pulverized coal and the combustion-supporting gas in the lance is 35% by volume or more.
- the combustion temperature is not increased at an oxygen concentration of 35% by volume or more.
- the combustion temperature increases even when the concentration of oxygen in a gas composed of the carrier gas and the combustion-supporting gas is 35% by volume or more. This means that the pulverized coal flow from the double wall lance 4 is not concentrated at a pulverized coal ratio of 150 kg/t or more and less than 170 kg/t.
- the combustion temperature levels off when the concentration of oxygen in a gas composed of the carrier gas and the combustion-supporting gas in the lance is 70% by volume or more, and the combustion temperature is not increased at an oxygen concentration of more than 70% by volume.
- the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas in the lance is 70% by volume or more, the combustion efficiency is not improved at a pulverized coal ratio of 170 kg/t or more, although the specific oxygen consumption increases.
- the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas is 35% by volume or more and less than 70% by volume, preferably 40% by volume or more and 65% by volume or less, more preferably 45% by volume or more and 60% by volume or less, at a pulverized coal ratio of 150 kg/t or more and less than 170 kg/t or a pulverized coal ratio of 170 kg/t.
- the upper limit of the pulverized coal ratio is 300 kg/t or less, preferably 250 kg/t or less.
- the shape of the notches 23 in the inner tube 21 viewed in the radial direction may be tetragonal as illustrated in Fig. 11(a) , triangular as illustrated in Fig. 11(b) , or U-shaped as illustrated in Fig. 11(c) .
- the size of the notches 23 is represented by the opening width of the notches 23 and the depth of the notches 23 from the opening to the bottom thereof.
- the angle ⁇ made by the center of the front end and the center of the lower end of each of the notches 23, more specifically the angle ⁇ of a line segment between the center of the opening and the center of the bottom of each of the notches 23 with respect to a chord of the opening preferably ranges from 30 to 90 degrees.
- Fig. 14 illustrates the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal as a function of the notch width.
- the notch width was represented by the ratio of the total width of the notches to the internal circumference of the inner tube.
- the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal were represented by ratios based on the case of the inner tube having no notch.
- the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal increased with increasing notch width.
- the dispersion width of the pulverized coal began to decrease at a certain notch width.
- the ratio of the total width of the notches to the circumference of the inner tube is preferably more than 0 and 0.5 or less, more preferably 0.05 or more and 0.3 or less, still more preferably 0.1 or more and 0.2 or less.
- Fig. 15 illustrates the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal as a function of the notch depth.
- the notch depth was represented by the depth itself.
- the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal was represented by ratios based on the case of the inner tube having no notch.
- the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal increased with increasing notch depth.
- the dispersion width of the pulverized coal began to decrease at a certain notch depth.
- the notch depth is preferably more than 0 and 12 mm or less, more preferably 2 mm or more and 10 mm or less, still more preferably 3 mm or more and 7 mm or less.
- Fig. 16 illustrates the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal as a function of the number of notches.
- the number of notches was represented by the ratio of the number of the notches to the maximum number of notches.
- the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal were represented by ratios based on the case of the inner tube having no notch.
- the maximum number of notches is an integer part of a quotient obtained by dividing the internal circumference of the inner tube of the double wall lance by the notch width, more specifically the maximum number of notches having a predetermined width in the inner tube.
- the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal increased with increasing number of notches.
- the dispersion width of the pulverized coal began to decrease at a certain number of notches. This is probably because although the degree of mixing between oxygen and pulverized coal and the dispersibility of the pulverized coal increase with increasing number of notches, an excessively great number of notches results in an increased ratio of oxygen flowing through the inner tube, thereby suppressing the dispersion of pulverized coal.
- the ratio of the number of the notches to the maximum number of notches is preferably more than 0 and 0.8 or less, more preferably 0.1 or more and 0.6 or less, still more preferably 0.2 or more and 0.5 or less.
- Fig. 17 illustrates the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal as a function of the width of a tetragonal notch or a triangular notch.
- the experimental results for the triangular notch is superimposed on Fig. 14 .
- the notch width was represented by the ratio of the total width of the notches to the internal circumference of the inner tube.
- the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal were represented by ratios based on the case of the inner tube having no notch.
- the ratio of the total width of the notches of any shape to the circumference of the inner tube is preferably more than 0 and 0.5 or less, more preferably 0.05 or more and 0.3 or less, still more preferably 0.1 or more and 0.2 or less.
- the lance is a stainless steel pipe, for example.
- a lance is sometimes surrounded by a water jacket and is cooled with water, a front end of the lance cannot be surrounded by the water jacket.
- a front end of an outer tube of a double wall lance that cannot be cooled with water is likely to change its shape with heat.
- a pulverized coal flow may be changed and hit a tuyere, thereby causing damage to the tuyere.
- a bent outer tube of a double wall lance may block a gap between the outer tube and an inner tube of the lance.
- a blockage in the outer tube may result in a melting loss of the outer tube of the double wall lance or may cause damage to a blow pipe. Deformation or wear damage of a lance makes it difficult to achieve the desired combustion temperature and decrease the specific consumption of a reducing material.
- the outer tube In order to cool an outer tube of a double wall lance, which cannot be cooled with water, the outer tube must be cooled with a gas flowing inside the outer tube. In the case that an outer tube of a double wall lance is cooled by dissipating heat into a gas flowing inside the outer tube, the flow velocity of the gas probably affects the lance temperature.
- the present inventors measured the lance surface temperature while changing the flow velocity of a gas injected through an outer tube of a double wall lance.
- oxygen was injected through the outer tube of the double wall lance, and pulverized coal was injected through an inner tube of the double wall lance. The flow velocity of a gas was changed with the amount of oxygen injected through the outer tube.
- An oxygen-enriched air may be used instead of oxygen. 2% or more, preferably 10% or more, oxygen-enriched air is used. An oxygen-enriched air is used not only for cooling but also in order to improve the combustibility of pulverized coal.
- Fig. 18 shows the measurement results.
- the outer tube of the double wall lance was a steel pipe called 20A schedule 5S.
- the inner tube of the double wall lance was a steel pipe called 15A schedule 90.
- the lance surface temperature was measured while changing the total flow velocity of oxygen and nitrogen injected through the outer tube.
- the terms "15A” and “20A” refer to the nominal outer diameter of a steel pipe according to JIS G 3459.
- 15A denotes an outer diameter of 21.7 mm
- 20A denotes an outer diameter of 27.2 mm.
- the term “schedule” is the nominal thickness of a steel pipe according to JIS G 3459.
- 20A schedule 5S denotes a thickness of 1.65 mm
- 15A schedule 90 denotes a thickness of 3.70 mm.
- plain steel may also be used.
- the outer diameter of a steel pipe is specified in JIS G 3452
- the thickness of the steel pipe is specified in JIS G 3454.
- the lance surface temperature decreases in inverse proportion to the flow velocity of a gas injected through the outer tube of the double wall lance.
- a double wall lance surface temperature of more than 880°C results in creep deformation and a bending of the double wall lance.
- the outlet flow velocity in the outer tube of the double wall lance is 20 m/sec or more.
- the double wall lance has no deformation or bending.
- An outlet flow velocity of more than 120 m/sec in the outer tube of the double wall lance is not practical in terms of the operating cost of the equipment.
- 120 m/sec is the upper limit of the outlet flow velocity in the outer tube of the double wall lance.
- the outlet flow velocity may be 20 m/sec or more, if necessary.
- Injecting part of oxygen for enrichment into a blast (as a combustion-supporting gas) through the outer tube 22 of the double wall lance 4 can prevent excess oxygen supply without disturbing the gas balance in the blast furnace and reduce the specific oxygen consumption.
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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)
- Manufacture Of Iron (AREA)
- Blast Furnaces (AREA)
Description
- The present invention relates to a method for operating a blast furnace that includes injecting pulverized coal through a blast furnace tuyere to increase the combustion temperature, thereby improving productivity and reducing CO2 emissions.
- Considering recent global warming due to increased carbon dioxide emissions, it is also important for the iron industry to reduce CO2 emissions. In blast furnaces, coke and pulverized coal injected through a tuyere are used as main reducing materials. Because of the difference in carbon dioxide emissions in pretreatment, the use of pulverized coal rather than coke can reduce CO2 emissions. For example,
Patent Literature 1 discloses that the combustion efficiency can be improved by using pulverized coal having a volatile matter content of 25 mass% or less at a pulverized coal ratio of 150 kg/t-pig iron or more, supplying the pulverized coal and oxygen to a lance for injecting a fuel through a tuyere, and increasing the oxygen concentration in the lance to 70% by volume or more. It is also proposed inPatent Literature 1 that in the case of a single-tube lance a mixture of oxygen and pulverized coal is injected through the single-tube lance, and in the case of a double wall lance pulverized coal is injected through an inner tube of the double wall lance, and oxygen is injected through an outer tube of the double wall lance. The pulverized coal ratio is the mass of pulverized coal used per ton of pig iron. -
Patent Literature 2 discloses that a reaction between pulverized coal and oxygen is promoted by dispersing the pulverized coal utilizing asperities formed on an outer tube of a double wall lance. -
Patent Literature 3 discloses that in a double wall lance for injecting pulverized coal through an inner tube thereof and oxygen through an outer tube thereof the contact between pulverized coal and oxygen is improved by shortening the inner tube relative to the outer tube, that is, placing a pulverized coal injecting front end of the inner tube upstream from an oxygen injecting front end of the outer tube in the injecting direction. -
- [PTL 1] Japanese Patent No.
4074467 - [PTL 2] Korean Patent Laid-Open Publication No.
2002-00047359 - [PTL 3] Japanese Unexamined Patent Application Publication No.
6-100912 - Further related art may be found in
JP 2000 192119 A CN 102 268 496 A . - Although much air is blown through a tuyere, a lance may be exposed to a high temperature. Thus, the supply of a mixture of a high concentration of oxygen and pulverized coal to a single-tube lance as described in
Patent Literature 1 is unrealistic from a safety standpoint. With a demand for a further reduction of CO2 emissions, it is desirable to increase the pulverized coal ratio to 170 kg/t-pig iron or more, for example. At a high pulverized coal ratio of 170 kg/t or more, however, even when pulverized coal is injected through an inner tube of a double wall lance and oxygen is injected through an outer tube thereof as described inPatent Literature 1, the combustion temperature levels off, and the combustion efficiency cannot be increased. - A gas flowing through an outer tube of a double wall lance also functions to cool the outer tube. In the presence of an obstacle that interferes with the gas flow, such as the asperities formed on the outer tube in
Patent Literature 2, a heat load is applied to a slow flow region, possibly causing wear damage, such as cracking or a melting loss. Such wear damage may induce backfire or clogging of a lance. An increase in the amount of pulverized coal inevitably causes a problem of abrasion of a raised portion due to pulverized coal injected through an inner tube. - Although shortening the front end of the inner tube of the double wall lance relative to the outer tube of the double wall lance as described in
Patent Literature 3 may improve the contact between pulverized coal and oxygen, an oxygen flow suppresses the dispersion of pulverized coal, and the combustibility of pulverized coal is not sufficiently improved. - The present invention has paid attention to these problems and aims to provide a blast furnace operation method for increasing the combustion temperature and thereby reducing CO2 emissions.
- In order to achieve this object, the present invention provides a blast furnace operation method described below.
- (1) A blast furnace operation method, including preparing pulverized coal having a volatile matter content of 25 mass% or less;
preparing a double wall lance for injecting the pulverized coal and a combustion-supporting gas through a tuyere, the double wall lance having an inner tube and an outer tube;
blowing hot air through the tuyere;
circumferentially forming a plurality of notches in a injecting front end of the inner tube of the double wall lance, the notches being cut in the axial direction;
injecting the pulverized coal together with a carrier gas through the inner tube at a pulverized coal ratio of 150 kg/t-pig iron or more; and
injecting the combustion-supporting gas through the outer tube of the double wall lance,
wherein the concentration of oxygen in a gas composed of the carrier gas and the combustion-supporting gas is 35% by volume or more. - (2) The blast furnace operation method according to (1), wherein the notches are circumferentially evenly spaced in the front end of the inner tube of the double wall lance.
- (3) The blast furnace operation method according to (2), wherein the ratio of the total width of the notches to the internal circumference of the inner tube of the double wall lance is more than 0 and 0.5 or less.
- (4) The blast furnace operation method according to (3), wherein the ratio of the total width of the notches to the internal circumference of the inner tube of the double wall lance is 0.05 or more and 0.3 or less.
- (5) The blast furnace operation method according to (4), wherein the ratio of the total width of the notches to the internal circumference of the inner tube of the double wall lance is 0.1 or more and 0.2 or less.
- (6) The blast furnace operation method according to (2), wherein each of the notches has a depth of more than 0 mm and 12 mm or less.
- (7) The blast furnace operation method according to (6), wherein each of the notches has a depth of 2 mm or more and 10 mm or less.
- (8) The blast furnace operation method according to (7), wherein each of the notches has a depth of 3 mm or more and 7 mm or less.
- (9) The blast furnace operation method according to (2), wherein the ratio of the number of the notches to the maximum number of notches is more than 0 and 0.8 or less, wherein the maximum number of notches is an integer part of a quotient obtained by dividing the internal circumference of the inner tube of the double wall lance by the width of one of the notches.
- (10) The blast furnace operation method according to (9), wherein the ratio of the number of the notches to the maximum number of notches is 0.1 or more and 0.6 or less.
- (11) The blast furnace operation method according to (10), wherein the ratio of the number of the notches to the maximum number of notches is 0.2 or more and 0.5 or less.
- (12) The blast furnace operation method according to (1), wherein the combustion-supporting gas is oxygen, and part of oxygen for enrichment is injected into a blast through the outer tube of the double wall lance.
- (13) The blast furnace operation method according to (1), wherein the pulverized coal has a volatile matter content of 3 mass% or more and 25 mass% or less.
- (14) The blast furnace operation method according to (1), wherein the combustion-supporting gas injected through the outer tube of the double wall lance has an outlet flow velocity in the range of 20 to 120 m/sec.
- (15) The blast furnace operation method according to (1), wherein the pulverized coal ratio is 170 kg/t-pig iron or more.
- (16) The blast furnace operation method according to (1), wherein the pulverized coal ratio is 170 kg/t-pig iron or more, and the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas is 35% by volume or more and less than 70% by volume.
- (17) The blast furnace operation method according to (16), wherein the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas is 40% by volume or more and 65% by volume or less.
- (18) The blast furnace operation method according to (17), wherein the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas is 45% by volume or more and 60% by volume or less.
- (19) The blast furnace operation method according to (15), wherein the pulverized coal ratio is 170 kg/t-pig iron or more and 300 kg/t-pig iron or less.
- (20) The blast furnace operation method according to (16), wherein the pulverized coal ratio is 170 kg/t-pig iron or more and 300 kg/t-pig iron or less.
- (21) The blast furnace operation method according to (1), wherein the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas is 35% by volume or more and less than 70% by volume.
- (22) The blast furnace operation method according to (21), wherein the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas is 40% by volume or more and 65% by volume or less.
- (23) The blast furnace operation method according to (22), wherein the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas is 45% by volume or more and 60% by volume or less.
- (24) The blast furnace operation method according to (1), wherein the pulverized coal ratio is 150 kg/t-pig iron or more and 300 kg/t-pig iron or less.
- (25) The blast furnace operation method according to (1), wherein the pulverized coal ratio is 150 kg/t-pig iron or more and less than 170 kg/t-pig iron.
- (26) The blast furnace operation method according to (1), wherein the pulverized coal ratio is 150 kg/t-pig iron or more and less than 170 kg/t-pig iron, and the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas is 35% by volume or more and less than 70% by volume.
- (27) The blast furnace operation method according to any one of (1) to (26), wherein at least one selected from the group consisting of waste plastics, refuse-derived fuels, organic resources, scrap woods, and CDQ coke dust is added to the pulverized coal.
- (28) The blast furnace operation method according to (27), wherein the pulverized coal accounts for 80 mass% or more, and at least one of the waste plastics, refuse-derived fuels, organic resources, scrap woods, and CDQ coke dust is used.
- In a blast furnace operation method according to the present invention in which a lance for injecting a fuel through a tuyere is a double tube, the method includes injecting pulverized coal together with a carrier gas through an inner tube of the double wall lance, injecting a combustion-supporting gas through an outer tube of the double wall lance, and forming notches in a injecting front end of the inner tube of the double wall lance, wherein the concentration of oxygen in a gas composed of the carrier gas and the combustion-supporting gas in the double wall lance is 35% by volume or more. Even in an operation using pulverized coal having a volatile matter content of 25 mass% or less at a high pulverized coal ratio of 150 kg/t or more, the combustion temperature can be increased, and consequently CO2 emissions can be reduced. When the pulverized coal ratio is 170 kg/t or more, the specific consumption of a combustion-supporting gas, such as oxygen, can be reduced by decreasing the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas in the double wall lance to less than 70% by volume.
- The notches circumferentially evenly spaced in the front end of the inner tube of the double wall lance improve the diffusion of pulverized coal and the combustion-supporting gas and further improve combustion efficiency.
- Injecting part of oxygen for enrichment into a blast as a combustion-supporting gas through the outer tube of the double wall lance can prevent excess oxygen supply without disturbing the gas balance in the blast furnace.
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- [
Fig. 1] Fig. 1 is a longitudinal sectional view of an embodiment of a blast furnace to which a blast furnace operation method according to the present invention is applied. - [
Fig. 2] Fig. 2 is an explanatory view of the combustion state when only pulverized coal is injected through the lance illustrated inFig. 1 . - [
Fig. 3] Fig. 3 is an explanatory view of the combustion mechanism of pulverized coal inFig. 2 . - [
Fig. 4] Fig. 4 is an explanatory view of the combustion mechanism in the case that pulverized coal and oxygen are injected. - [
Fig. 5] Fig. 5 is an explanatory view of a combustion experimental apparatus. - [
Fig. 6] Figs. 6(a) to 6(c) are explanatory views of the concentration of a pulverized coal flow. - [
Fig. 7] Figs. 7(a) and 7(b) are detail views of a injecting front end of the lance illustrated inFig. 1 . - [
Fig. 8] Figs. 8(a) and 8(b) are explanatory views of the pulverized coal flow of the lance illustrated inFig. 7 and a lance formed of a straight tube. - [
Fig. 9] Fig. 9 is a graph of the relationship between the concentration of oxygen in a lance gas and the combustion rate at a pulverized coal ratio of 150 kg/t-pig iron or more and less than 170 kg/t-pig iron. - [
Fig. 10] Fig. 10 is a graph of the relationship between the concentration of oxygen in a lance gas and the combustion rate at a pulverized coal ratio of 170 kg/t-pig iron or more. - [
Fig. 11] Figs. 11(a) to 11(c) are explanatory views of the shape of a notch in an inner tube viewed in the radial direction. - [
Fig. 12] Figs. 12(a) and 12(b) are explanatory views of the angle θ made by a center of a front end and a center of a lower end of a notch. - [
Fig. 13] Fig. 13 is an explanatory view of an experiment on the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal. - [
Fig. 14] Fig. 14 is an explanatory view of the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal as a function of the notch width. - [
Fig. 15] Fig. 15 is an explanatory view of the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal as a function of the notch depth. - [
Fig. 16] Fig. 16 is an explanatory view of the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal as a function of the number of notches. - [
Fig. 17] Fig. 17 is an explanatory view of the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal as a function of the width of a tetragonal notch or a triangular notch. - [
Fig. 18] Fig. 18 is an explanatory view of the relationship between the flow velocity at a lance outlet and the lance surface temperature. - A blast furnace operation method according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
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Fig. 1 is an overall view of a blast furnace to which a blast furnace operation method according to the present embodiment is applied. As illustrated in the figure, atuyere 3 of ablast furnace 1 is coupled to ablow pipe 2 for blowing hot air, and alance 4 is inserted in theblow pipe 2. A combustion space called araceway 5 is disposed over a coke layer in front of thetuyere 3 in a hot air blowing direction. Combustion and gasification of a reducing material occur mainly in this combustion space. -
Fig. 2 illustrates the combustion state when only pulverizedcoal 6 is injected as a solid reducing material through thelance 4. The pulverizedcoal 6 is injected from thelance 4 into theraceway 5 through thetuyere 3. The volatile matter and fixed carbon of the pulverizedcoal 6 burn together withcoke 7. After the volatile matter is released, an aggregate of carbon and ash, which is generally called char, is discharged from the raceway asunburned char 8. The hot air velocity in front of thetuyere 3 in the hot air blowing direction is approximately 200 m/sec. An oxygen zone extends approximately 0.3 to 0.5 m from a front end of thelance 4 into theraceway 5. Thus, it is necessary to increase the temperature of pulverized coal particles and improve the efficiency of contact with oxygen (dispersibility) during a period substantially on the order of 1/1000 second. -
Fig. 3 illustrates the combustion mechanism in the case that only the pulverized coal (PC in the figure) 6 is injected into theblow pipe 2 through thelance 4. Particles of the pulverizedcoal 6 injected into theraceway 5 through thetuyere 3 are heated through radiative heat transfer from flames in theraceway 5. The temperature of the particles increases rapidly through radiative heat transfer and conductive heat transfer. The particles start to decompose at a temperature of 300°C or more. The volatile matter of the particles ignites and forms a flame. The combustion temperature reaches a temperature in the range of 1400°C to 1700°C. After the volatile matter is completely released, thechar 8 remains. Since thechar 8 is mainly composed of fixed carbon, a combustion reaction is accompanied by a carbon dissolution reaction, such as a solution-loss reaction or a hydrogen gas shift reaction. -
Fig. 4 illustrates the combustion mechanism in the case that the pulverizedcoal 6, together with a combustion-supportinggas oxygen 9, is injected into theblow pipe 2 through thelance 4. The pulverizedcoal 6 and theoxygen 9 are simply injected parallel to each other. For reference, a dash-dot-dot line in the figure indicates the combustion temperature in the case that only the pulverized coal is injected as illustrated inFig. 3 . Simultaneous injecting of the pulverized coal and oxygen promotes mixing of the pulverized coal and oxygen in the vicinity of the lance and accelerates the combustion of the pulverized coal, thereby increasing the combustion temperature in the close vicinity of the lance. - On the basis of such findings, a combustion experiment was performed with a combustion experimental apparatus illustrated in
Fig. 5 . Imitating the interior of a blast furnace, anexperiment furnace 11 is filled with coke, and the interior of araceway 15 can be observed through an observation window. Alance 14 is inserted in ablow pipe 12. As a hot air blown from an air-heating furnace to the blast furnace, a hot air produced by acombustion burner 13 can be blasted into theexperiment furnace 11 at a predetermined blast rate. The oxygen enrichment level of the blast air can be controlled with theblow pipe 12. One or both of pulverized coal and oxygen can be injected into theblow pipe 12 through thelance 14. An exhaust gas from theexperiment furnace 11 is separated into an exhaust gas and dust in aseparator 16 called cyclone. The exhaust gas is sent to an exhaust gas treatment system, such as an auxiliary combustion furnace. The dust is collected in acollecting box 17. - The pulverized coal is composed of fixed carbon (FC) 71.4%, volatile matter (VM) 19.5%, and ash 9.1%. The blast conditions include a blast temperature of 1200°C, a flow rate of 300 Nm3/hr, a blast velocity of 130 m/sec at a front end of the tuyere, and an oxygen enrichment of 6% (an oxygen concentration of 27.0%, an enrichment of 6.0% relative to an oxygen concentration of 21% in air). With respect to the pulverized coal injecting conditions, the
lance 14 was a double wall lance, pulverized coal was injected through an inner tube of the double wall lance, and oxygen was injected as a combustion-supporting gas through an outer tube of the double wall lance. Pulverized coal was carried by a carrier gas. The carrier gas for pulverized coal was nitrogen. The solid-gas ratio of pulverized coal to a carrier gas for carrying pulverized coal ranges from 10 to 25 kg/Nm3 in the case that a powder, that is, pulverized coal is carried by a small amount of gas (high concentration transport) or 5 to 10 kg/Nm3 in the case that pulverized coal is carried by a large amount of gas (low concentration transport). In addition to nitrogen, the carrier gas may also be air. An experiment was conducted with a focus on variations in pulverized coal flow at a pulverized coal ratio in the range of 100 to 180 kg/t. When oxygen was injected as a combustion-supporting gas, part of oxygen for enrichment was included in the blast so as not to change the total amount of oxygen blown into the furnace. The combustion-supporting gas may also be an oxygen-enriched air. - The present inventors found the following in this experiment. When pulverized coal is injected through the inner tube of the double wall lance, and a combustion-supporting gas, that is, oxygen is injected through the outer tube of the double wall lance, the combustion temperature is increased by increasing the oxygen concentration in an operation at a low pulverized coal ratio of less than 150 kg/t even if the pulverized coal has a volatile matter content of 25 mass% or less. In an operation at a high pulverized coal ratio of 150 kg/t or more, however, the combustion temperature is not increased by increasing the oxygen concentration. When the pulverized coal ratio is 150 kg/t or more, the combustion temperature levels off at an oxygen concentration of approximately 35% by volume. As described below, this is because pulverized coal injected through the inner tube of the double wall lance localizes (or is concentrated) in the center of a blast flow and rarely or does not come into contact with oxygen injected through the outer tube of the double wall lance. The present invention is the same as the related art in that pulverized coal is injected through an inner tube of a double wall lance and a combustion-supporting gas, for example, oxygen is injected through an outer tube of the double wall lance. However, in the present invention, notches formed in a injecting front end of an inner tube of a double wall lance can improve the diffusion of pulverized coal and a combustion-supporting gas and thereby promote contact between the pulverized coal and the combustion-supporting gas and increase the combustion temperature. Even if the notches are formed in the injecting front end of the inner tube of the double wall lance, when the pulverized coal ratio is 170 kg/t or more, the combustion temperature also levels off at an oxygen concentration of 70% by volume or more in the lance. Thus, an oxygen concentration of more than 70% by volume does not contribute to high combustion efficiency and results in an increased specific oxygen consumption. Unlike a projection, such as a baffle, which suffers wear damage due to collision with pulverized coal, the notches formed in the inner tube of the double wall lance have no wear damage trouble.
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Fig. 6(a) illustrates the pulverized coal flow in an operation at a low pulverized coal ratio of less than 150 kg/t. Since the lance is a straight tube having a constant diameter in the experiment, the dispersion width of pulverized coal is substantially constant. The pulverized coal flow has a substantially uniform concentration within the dispersion width at such a low pulverized coal ratio. In an operation at a high pulverized coal ratio of 150 kg/t or more, however, as illustrated inFig. 6(b) , pulverized coal is concentrated in the center of the dispersion width. In particular, in an operation at a high pulverized coal ratio of 170 kg/t or more, pulverized coal is highly concentrated in the center of the pulverized coal flow. Since oxygen is injected through the outer tube of the double wall lance, pulverized coal concentrated in the center of the pulverized coal flow does not come into contact with oxygen, and such unburned pulverized coal injected into the furnace interferes with aeration in the blast furnace. Even if the amount of oxygen blown is increased to promote contact with oxygen, when the amount of oxygen blown exceeds a certain threshold, as illustrated inFig. 6(c) , the pulverized coal flow is further concentrated in the center of the surrounding oxygen flow. Thus, the contact with oxygen is not substantially promoted, and the combustion temperature levels off as described later. -
Fig. 7 illustrates the details of a injecting front end of thedouble wall lance 4 according to the present embodiment.Fig. 7(a) is a longitudinal sectional view, andFig. 7(b) is a cross-sectional view taken along the line A-A inFig. 7(a) . In the present embodiment, as illustrated inFig. 7 ,notches 23 are formed in a injecting front end of aninner tube 21 of thedouble wall lance 4. Pulverizedcoal 6 and a combustion-supportinggas oxygen 9 diffuse through thenotches 23. This allows efficient contact between the pulverizedcoal 6 and theoxygen 9 and increases the combustion temperature. When theinner tube 21 has an inner diameter of approximately 16 mm, fournotches 23 each having an approximately 5 mm x 5 mm square cross section are circumferentially evenly spaced in theinner tube 21 at intervals of 90 degrees. Anouter tube 22 is a straight tube. The shape of thenotches 23 is not limited to the shape described above and may be triangular or U-shaped as described below. The number of thenotches 23 is also not limited to four. - As illustrated in
Fig. 8(a) , the pulverizedcoal 6 and the combustion-supportinggas oxygen 9 can diffuse through thenotches 23 formed in the injecting front end of theinner tube 21 of thedouble wall lance 4 and come into contact with each other, thereby increasing the combustion temperature. In a knowndouble wall lance 4 having no notch in a injecting front end of aninner tube 21, as illustrated inFig. 8(b) , pulverizedcoal 6 is concentrated in a central portion of a combustion-supportinggas oxygen 9. This results in poor contact between the pulverizedcoal 6 and theoxygen 9, and the combustion temperature levels off. As described above, unlike a projection, such as a baffle, which suffers wear damage due to collision with pulverized coal, thenotches 23 formed in theinner tube 21 of thedouble wall lance 4 have no wear damage trouble. -
Fig. 9 shows the combustion temperature represented by the combustion rate under the conditions that the pulverized coal ratio is 150 kg/t, the volatile matter of the pulverized coal is 25 mass% or less, the blast conditions are fixed, the oxygen enrichment ratio is fixed, and the injecting front end of theinner tube 21 of thedouble wall lance 4 has thenotches 23 or no notch. In both cases, pulverized coal is injected through the inner tube of thedouble wall lance 4, and a combustion-supporting gas oxygen is injected through the outer tube of thedouble wall lance 4. As is clear from the figure, in the case of thedouble wall lance 4 having no notch in theinner tube 21, the combustion temperature levels off when the concentration of oxygen in a gas composed of the carrier gas for carrying pulverized coal and the combustion-supporting gas in the lance is 35% by volume or more. Thus, in the case of thedouble wall lance 4 having no notch in theinner tube 21, the combustion temperature is not increased at an oxygen concentration of 35% by volume or more. In contrast, in the case of thedouble wall lance 4 having thenotches 23 in theinner tube 21, the combustion temperature increases even when the concentration of oxygen in a gas composed of the carrier gas and the combustion-supporting gas is 35% by volume or more. This means that the pulverized coal flow from thedouble wall lance 4 is not concentrated at a pulverized coal ratio of 150 kg/t or more and less than 170 kg/t. - Even in the case of the
double wall lance 4 having thenotches 23 in theinner tube 21, however, when the pulverized coal ratio is 170 kg/t or more, as illustrated inFig. 10 , the combustion temperature levels off when the concentration of oxygen in a gas composed of the carrier gas and the combustion-supporting gas in the lance is 70% by volume or more, and the combustion temperature is not increased at an oxygen concentration of more than 70% by volume. Thus, when the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas in the lance is 70% by volume or more, the combustion efficiency is not improved at a pulverized coal ratio of 170 kg/t or more, although the specific oxygen consumption increases. Thus, even in the case of thedouble wall lance 4 having thenotches 23 in theinner tube 21, the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas is 35% by volume or more and less than 70% by volume, preferably 40% by volume or more and 65% by volume or less, more preferably 45% by volume or more and 60% by volume or less, at a pulverized coal ratio of 150 kg/t or more and less than 170 kg/t or a pulverized coal ratio of 170 kg/t. The upper limit of the pulverized coal ratio is 300 kg/t or less, preferably 250 kg/t or less. - The shape of the
notches 23 in theinner tube 21 viewed in the radial direction may be tetragonal as illustrated inFig. 11(a) , triangular as illustrated inFig. 11(b) , or U-shaped as illustrated inFig. 11(c) . The size of thenotches 23 is represented by the opening width of thenotches 23 and the depth of thenotches 23 from the opening to the bottom thereof. As illustrated inFig. 12 , the angle θ made by the center of the front end and the center of the lower end of each of thenotches 23, more specifically the angle θ of a line segment between the center of the opening and the center of the bottom of each of thenotches 23 with respect to a chord of the opening preferably ranges from 30 to 90 degrees. An experiment was performed on the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal while the notch shape, particularly the notch size, was changed. In the experiment, as illustrated inFig. 13 , smoke was emitted from an inner tube and an outer tube of a double wall lance, that is, a pulverized coal flow path and an oxygen flow path. The area of an overlap between the smoke emitted from the pulverized coal flow path and the smoke emitted from the oxygen flow path was determined as a contact area between oxygen and pulverized coal in an image analysis. The dispersion width of the pulverized coal was determined from the spread angle of the smoke emitted from the pulverized coal flow path. The experiment was mainly performed on notches having a tetragonal shape when viewed in the radial direction of the inner tube. - First,
Fig. 14 illustrates the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal as a function of the notch width. The notch width was represented by the ratio of the total width of the notches to the internal circumference of the inner tube. The contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal were represented by ratios based on the case of the inner tube having no notch. As is clear from the figure, the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal increased with increasing notch width. However, the dispersion width of the pulverized coal began to decrease at a certain notch width. This is probably because although the degree of mixing between oxygen and pulverized coal increases with increasing notch width, an excessively large notch width results in an inflow of oxygen into the inside of the double wall lance in the radial direction, thereby suppressing the dispersion of pulverized coal. Thus, the ratio of the total width of the notches to the circumference of the inner tube is preferably more than 0 and 0.5 or less, more preferably 0.05 or more and 0.3 or less, still more preferably 0.1 or more and 0.2 or less. -
Fig. 15 illustrates the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal as a function of the notch depth. The notch depth was represented by the depth itself. The contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal was represented by ratios based on the case of the inner tube having no notch. As is clear from the figure, the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal increased with increasing notch depth. However, the dispersion width of the pulverized coal began to decrease at a certain notch depth. This is probably because although the degree of mixing between oxygen and pulverized coal increases with increasing notch depth, an excessively large notch depth results in the stabilization of a flow at the front end of the lance, thereby suppressing the dispersion of pulverized coal. Thus, the notch depth is preferably more than 0 and 12 mm or less, more preferably 2 mm or more and 10 mm or less, still more preferably 3 mm or more and 7 mm or less. -
Fig. 16 illustrates the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal as a function of the number of notches. The number of notches was represented by the ratio of the number of the notches to the maximum number of notches. The contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal were represented by ratios based on the case of the inner tube having no notch. The maximum number of notches is an integer part of a quotient obtained by dividing the internal circumference of the inner tube of the double wall lance by the notch width, more specifically the maximum number of notches having a predetermined width in the inner tube. As is clear from the figure, the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal increased with increasing number of notches. However, the dispersion width of the pulverized coal began to decrease at a certain number of notches. This is probably because although the degree of mixing between oxygen and pulverized coal and the dispersibility of the pulverized coal increase with increasing number of notches, an excessively great number of notches results in an increased ratio of oxygen flowing through the inner tube, thereby suppressing the dispersion of pulverized coal. Thus, the ratio of the number of the notches to the maximum number of notches is preferably more than 0 and 0.8 or less, more preferably 0.1 or more and 0.6 or less, still more preferably 0.2 or more and 0.5 or less. -
Fig. 17 illustrates the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal as a function of the width of a tetragonal notch or a triangular notch. InFig. 17 , the experimental results for the triangular notch is superimposed onFig. 14 . The notch width was represented by the ratio of the total width of the notches to the internal circumference of the inner tube. The contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal were represented by ratios based on the case of the inner tube having no notch. As is clear from the figure, in both cases of the tetragonal notch and the triangular notch, the contact area between oxygen and pulverized coal and the dispersion width of the pulverized coal increased with increasing notch width. However, the dispersion width of the pulverized coal began to decrease at a certain notch width. This is probably because although the degree of mixing between oxygen and pulverized coal increases with increasing notch width as illustrated inFig. 14 also in the case of the triangular notch, an excessively large notch width results in an inflow of oxygen into the inside of the double wall lance in the radial direction, thereby suppressing the dispersion of pulverized coal. Thus, the ratio of the total width of the notches of any shape to the circumference of the inner tube is preferably more than 0 and 0.5 or less, more preferably 0.05 or more and 0.3 or less, still more preferably 0.1 or more and 0.2 or less. - With an increase in combustion temperature, the outer tube of the double wall lance tends to be exposed to a high temperature. The lance is a stainless steel pipe, for example. Although a lance is sometimes surrounded by a water jacket and is cooled with water, a front end of the lance cannot be surrounded by the water jacket. In particular, it was found that a front end of an outer tube of a double wall lance that cannot be cooled with water is likely to change its shape with heat. When a lance is deformed or bent, this makes it difficult to blow a gas or pulverized coal into an intended portion or replace the consumable lance. A pulverized coal flow may be changed and hit a tuyere, thereby causing damage to the tuyere. A bent outer tube of a double wall lance may block a gap between the outer tube and an inner tube of the lance. A blockage in the outer tube may result in a melting loss of the outer tube of the double wall lance or may cause damage to a blow pipe. Deformation or wear damage of a lance makes it difficult to achieve the desired combustion temperature and decrease the specific consumption of a reducing material.
- In order to cool an outer tube of a double wall lance, which cannot be cooled with water, the outer tube must be cooled with a gas flowing inside the outer tube. In the case that an outer tube of a double wall lance is cooled by dissipating heat into a gas flowing inside the outer tube, the flow velocity of the gas probably affects the lance temperature. Thus, the present inventors measured the lance surface temperature while changing the flow velocity of a gas injected through an outer tube of a double wall lance. In the experiment, oxygen was injected through the outer tube of the double wall lance, and pulverized coal was injected through an inner tube of the double wall lance. The flow velocity of a gas was changed with the amount of oxygen injected through the outer tube. An oxygen-enriched air may be used instead of oxygen. 2% or more, preferably 10% or more, oxygen-enriched air is used. An oxygen-enriched air is used not only for cooling but also in order to improve the combustibility of pulverized coal.
Fig. 18 shows the measurement results. - The outer tube of the double wall lance was a steel pipe called 20A schedule 5S. The inner tube of the double wall lance was a steel pipe called
15A schedule 90. The lance surface temperature was measured while changing the total flow velocity of oxygen and nitrogen injected through the outer tube. The terms "15A" and "20A" refer to the nominal outer diameter of a steel pipe according to JIS G 3459. 15A denotes an outer diameter of 21.7 mm, and 20A denotes an outer diameter of 27.2 mm. The term "schedule" is the nominal thickness of a steel pipe according to JIS G 3459. 20A schedule 5S denotes a thickness of 1.65 mm, and15A schedule 90 denotes a thickness of 3.70 mm. In addition to a stainless steel pipe, plain steel may also be used. In this case, the outer diameter of a steel pipe is specified in JIS G 3452, and the thickness of the steel pipe is specified in JIS G 3454. - As indicated by a dash-dot-dot line in the figure, the lance surface temperature decreases in inverse proportion to the flow velocity of a gas injected through the outer tube of the double wall lance. In a double wall lance formed of a steel pipe, a double wall lance surface temperature of more than 880°C results in creep deformation and a bending of the double wall lance. Thus, when the outer tube of the double wall lance is a 20A schedule 5S steel pipe, and the double wall lance surface temperature is 880°C or less, the outlet flow velocity in the outer tube of the double wall lance is 20 m/sec or more. So long as the outlet flow velocity in the outer tube of the double wall lance is 20 m/sec or more, the double wall lance has no deformation or bending. An outlet flow velocity of more than 120 m/sec in the outer tube of the double wall lance is not practical in terms of the operating cost of the equipment. Thus, 120 m/sec is the upper limit of the outlet flow velocity in the outer tube of the double wall lance. In the case of single-tube lances, which have a lower heat load than double wall lances, the outlet flow velocity may be 20 m/sec or more, if necessary.
- In the embodiment described above, the pulverized coal may have an average particle size in the range of 10 to 100 µm. Considering combustibility as well as supply from the lance and supply to the lance, the pulverized coal preferably has an average particle size in the range of 20 to 50 µm. Although pulverized coal having an average particle size of less than 20 µm has high combustibility, the lance is often clogged during transport of the pulverized coal (pneumatic transport). Pulverized coal having an average particle size of more than 50 µm may have low combustibility.
- Pulverized coal injected through the inner tube of the double wall lance may be coal having a volatile matter content of 25 mass% or less or anthracite coal, which can be used as a solid reducing material. Anthracite coal has a volatile matter content in the range of 3 to 5 mass%. Thus, pulverized coal used in the present invention is referred to as pulverized coal having a volatile matter content of 3 mass% or more and 25 mass% or less, including anthracite coal.
- A solid reducing material to be injected mainly contains pulverized coal and may also contain a waste plastic, refuse-derived fuel (RDF), organic resource (biomass), scrap wood, and/or CDQ coke dust. CDQ coke dust is coke breeze collected by a coke dry quenching (CDQ) apparatus. When used, the ratio of pulverized coal to all the solid reducing material is preferably 80 mass% or more. The heat of reaction of pulverized coal is different from the heat of reaction of a waste plastic, refuse-derived fuel (RDF), organic resource (biomass), scrap wood, or CDQ coke dust. Thus, when the amount of pulverized coal approaches the amount of auxiliary material, this tends to result in uneven combustion and unstable operation. Furthermore, the calorific value of a combustion reaction of a waste plastic, refuse-derived fuel (RDF), organic resource (biomass), or scrap wood is lower than the calorific value of a combustion reaction of pulverized coal. Thus, injecting a large amount of the auxiliary material results in low substitution efficiency for the solid reducing material charged through the top of the furnace. Although CDQ coke dust has a high calorific value, CDQ coke dust contains no volatile matter, is difficult to ignite, and has low substitution efficiency. Thus, pulverized coal preferably accounts for 80 mass% or more.
- A waste plastic, refuse-derived fuel (RDF), organic resource (biomass), or scrap wood may be used in the form of small grains having a size of 6 mm or less, preferably 3 mm or less, in combination with pulverized coal. CDQ coke dust may be directly used. The auxiliary material may be mixed with pulverized coal carried by a carrier gas. The auxiliary material may be mixed with pulverized coal in advance.
- In a blast furnace operation method according to the present embodiment in which a
lance 4 for injecting a fuel through atuyere 3 is a double tube, the method includes injecting pulverized coal through aninner tube 21 of thedouble wall lance 4, injecting oxygen (a combustion-supporting gas) through anouter tube 22 of thedouble wall lance 4, and formingnotches 23 in a injecting front end of theinner tube 21 of thedouble wall lance 4, wherein the concentration of oxygen in a gas composed of a carrier gas for carrying the pulverized coal and the combustion-supporting gas is 35% by volume or more. Even in an operation using pulverized coal having a volatile matter content of 25 mass% or less at a high pulverized coal ratio of 150 kg/t or more, the combustion temperature can be increased, and consequently CO2 emissions can be reduced. At a pulverized coal ratio of 170 kg/t or more, the specific oxygen consumption can be reduced by decreasing the concentration of oxygen in the gas composed of the carrier gas for carrying pulverized coal and the combustion-supporting gas to less than 70% by volume. - The
notches 23 circumferentially evenly spaced in the front end of theinner tube 21 of thedouble wall lance 4 improve the diffusion of pulverized coal and the combustion-supporting gas and further improve combustion efficiency. - Injecting part of oxygen for enrichment into a blast (as a combustion-supporting gas) through the
outer tube 22 of thedouble wall lance 4 can prevent excess oxygen supply without disturbing the gas balance in the blast furnace and reduce the specific oxygen consumption. -
- 1
- blast furnace
- 2
- blow pipe
- 3
- tuyere
- 4
- lance
- 5
- raceway
- 6
- pulverized coal
- 7
- coke
- 8
- char
- 9
- oxygen
- 21
- inner tube
- 22
- outer tube
- 23
- notch
Claims (28)
- A blast furnace (1) operation method, comprising:
preparing pulverized coal (6) having a volatile matter content of 25 mass% or less;
preparing a double wall lance (4) for injecting the pulverized coal and a combustion-supporting gas (9) through a tuyere (3), the double wall lance having an inner tube (21) and an outer tube (22);
blowing hot air through the tuyere;
circumferentially forming a plurality of notches (23) in a injecting front end of the inner tube of the double wall lance, the notches being cut in the axial direction;
injecting the pulverized coal together with a carrier gas through the inner tube at a pulverized coal ratio of 150 kg/t-pig iron or more; and
injecting the combustion-supporting gas through the outer tube of the double wall lance,
wherein the concentration of oxygen in a gas composed of the carrier gas and the combustion-supporting gas is 35% by volume or more and characterized in that
the notches are so formed that the pulverized coal and the combustion-supporting gas can diffuse through the notches and come into contact with each other. - The blast furnace operation method according to Claim 1, wherein
the notches are circumferentially evenly spaced in the front end of the inner tube of the double wall lance. - The blast furnace operation method according to Claim 2, wherein
the ratio of the total width of the notches to the internal circumference of the inner tube of the double wall lance is more than 0 and 0.5 or less. - The blast furnace operation method according to Claim 3, wherein
the ratio of the total width of the notches to the internal circumference of the inner tube of the double wall lance is 0.05 or more and 0.3 or less. - The blast furnace operation method according to Claim 4, wherein the ratio of the total width of the notches to the internal circumference of the inner tube of the double wall lance is 0.1 or more and 0.2 or less.
- The blast furnace operation method according to Claim 2, wherein each of the notches has a depth of more than 0 mm and 12 mm or less.
- The blast furnace operation method according to Claim 6, wherein each of the notches has a depth of 2 mm or more and 10 mm or less.
- The blast furnace operation method according to Claim 7, wherein each of the notches has a depth of 3 mm or more and 7 mm or less.
- The blast furnace operation method according to Claim 2, wherein the ratio of the number of the notches to the maximum number of notches is more than 0 and 0.8 or less, wherein the maximum number of notches is an integer part of a quotient obtained by dividing the internal circumference of the inner tube of the double wall lance by the width of one of the notches.
- The blast furnace operation method according to Claim 9, wherein the ratio of the number of the notches to the maximum number of notches is 0.1 or more and 0.6 or less.
- The blast furnace operation method according to Claim 10, wherein
the ratio of the number of the notches to the maximum number of notches is 0.2 or more and 0.5 or less. - The blast furnace operation method according to Claim 1, wherein
the combustion-supporting gas is oxygen, and part of oxygen for enrichment is injected into a blast through the outer tube of the double wall lance. - The blast furnace operation method according to Claim 1, wherein
the pulverized coal has a volatile matter content of 3 mass% or more and 25 mass% or less. - The blast furnace operation method according to Claim 1, wherein
the combustion-supporting gas injected through the outer tube of the double wall lance has an outlet flow velocity in the range of 20 to 120 m/sec. - The blast furnace operation method according to Claim 1, wherein
the pulverized coal ratio is 170 kg/t-pig iron or more. - The blast furnace operation method according to Claim 1, wherein
the pulverized coal ratio is 170 kg/t-pig iron or more, and
the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas is 35% by volume or more and less than 70% by volume. - The blast furnace operation method according to Claim 16, wherein
the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas is 40% by volume or more and 65% by volume or less. - The blast furnace operation method according to Claim 17, wherein
the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas is 45% by volume or more and 60% by volume or less. - The blast furnace operation method according to Claim 15, wherein
the pulverized coal ratio is 170 kg/t-pig iron or more and 300 kg/t-pig iron or less. - The blast furnace operation method according to Claim 16, wherein
the pulverized coal ratio is 170 kg/t-pig iron or more and 300 kg/t-pig iron or less. - The blast furnace operation method according to Claim 1, wherein
the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas is 35% by volume or more and less than 70% by volume. - The blast furnace operation method according to Claim 21, wherein
the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas is 40% by volume or more and 65% by volume or less. - The blast furnace operation method according to Claim 22, wherein
the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas is 45% by volume or more and 60% by volume or less. - The blast furnace operation method according to Claim 1, wherein
the pulverized coal ratio is 150 kg/t-pig iron or more and 300 kg/t-pig iron or less. - The blast furnace operation method according to Claim 1, wherein
the pulverized coal ratio is 150 kg/t-pig iron or more and less than 170 kg/t-pig iron. - The blast furnace operation method according to Claim 1, wherein
the pulverized coal ratio is 150 kg/t-pig iron or more and less than 170 kg/t-pig iron, and
the concentration of oxygen in the gas composed of the carrier gas and the combustion-supporting gas is 35% by volume or more and less than 70% by volume. - The blast furnace operation method according to any one of Claims 1 to 26, wherein
at least one selected from the group consisting of waste plastics, refuse-derived fuels, organic resources, scrap woods, and CDQ coke dust is added to the pulverized coal. - The blast furnace operation method according to Claim 27, wherein
the pulverized coal accounts for 80 mass% or more, and at least one of the waste plastics, refuse-derived fuels, organic resources, scrap woods, and CDQ coke dust is used.
Priority Applications (2)
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EP23184934.0A EP4283233A1 (en) | 2011-12-21 | 2012-03-01 | Double wall lance |
EP18181898.0A EP3421618B1 (en) | 2011-12-21 | 2012-03-01 | Double wall lance |
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JP2011279954A JP5923967B2 (en) | 2010-12-27 | 2011-12-21 | Blast furnace operation method |
PCT/JP2012/055893 WO2013094230A1 (en) | 2011-12-21 | 2012-03-01 | Blast furnace operation method |
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EP18181898.0A Division-Into EP3421618B1 (en) | 2011-12-21 | 2012-03-01 | Double wall lance |
EP18181898.0A Division EP3421618B1 (en) | 2011-12-21 | 2012-03-01 | Double wall lance |
EP23184934.0A Division EP4283233A1 (en) | 2011-12-21 | 2012-03-01 | Double wall lance |
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EP2796566A1 EP2796566A1 (en) | 2014-10-29 |
EP2796566A4 EP2796566A4 (en) | 2015-12-02 |
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EP23184934.0A Pending EP4283233A1 (en) | 2011-12-21 | 2012-03-01 | Double wall lance |
EP18181898.0A Active EP3421618B1 (en) | 2011-12-21 | 2012-03-01 | Double wall lance |
EP12860851.0A Active EP2796566B1 (en) | 2011-12-21 | 2012-03-01 | Blast furnace operation method |
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KR (1) | KR101629123B1 (en) |
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DE102014216336A1 (en) * | 2014-08-18 | 2016-02-18 | Küttner Holding GmbH & Co. KG | Process for injecting replacement reductants into a blast furnace |
CN110714106B (en) * | 2019-10-30 | 2020-12-29 | 沈忠凡 | Blast furnace optimization smelting method of high-titanium type vanadium titano-magnetite |
CN114787391B (en) * | 2019-11-29 | 2023-09-12 | 日本制铁株式会社 | Method for operating blast furnace |
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- 2012-03-01 BR BR112014015336-1A patent/BR112014015336B1/en active IP Right Grant
- 2012-03-01 CN CN201280063993.6A patent/CN104024440B/en active Active
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Also Published As
Publication number | Publication date |
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IN2014KN01261A (en) | 2015-10-16 |
CN104024440B (en) | 2016-01-20 |
TWI487791B (en) | 2015-06-11 |
AU2012355194B2 (en) | 2015-09-03 |
EP2796566A4 (en) | 2015-12-02 |
WO2013094230A1 (en) | 2013-06-27 |
BR112014015336A8 (en) | 2017-06-13 |
EP3421618A1 (en) | 2019-01-02 |
AU2012355194A1 (en) | 2014-07-24 |
KR101629123B1 (en) | 2016-06-09 |
BR112014015336B1 (en) | 2019-05-14 |
KR20140109964A (en) | 2014-09-16 |
EP2796566A1 (en) | 2014-10-29 |
EP3421618B1 (en) | 2023-09-13 |
EP4283233A1 (en) | 2023-11-29 |
TW201326405A (en) | 2013-07-01 |
CN104024440A (en) | 2014-09-03 |
BR112014015336A2 (en) | 2017-06-13 |
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