WO2013108768A1 - 高炉設備 - Google Patents
高炉設備 Download PDFInfo
- Publication number
- WO2013108768A1 WO2013108768A1 PCT/JP2013/050623 JP2013050623W WO2013108768A1 WO 2013108768 A1 WO2013108768 A1 WO 2013108768A1 JP 2013050623 W JP2013050623 W JP 2013050623W WO 2013108768 A1 WO2013108768 A1 WO 2013108768A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coal
- blast furnace
- pulverized
- hot air
- nitrogen gas
- Prior art date
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Classifications
-
- 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
- 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
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/04—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10F—DRYING OR WORKING-UP OF PEAT
- C10F5/00—Drying or de-watering peat
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/08—Treating solid fuels to improve their combustion by heat treatments, e.g. calcining
- C10L9/083—Torrefaction
-
- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
- F27B1/20—Arrangements of devices for charging
-
- 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
- F27D3/0033—Charging; Discharging; Manipulation of charge charging of particulate material
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- 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
- F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/02—Preheating, e.g. in a laminating line
- F27M2003/025—Drying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/14—Pyrolising
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
Definitions
- the present invention relates to blast furnace equipment.
- pig iron In the blast furnace facility, raw materials such as iron ore, limestone, and coal are charged into the blast furnace body from the top, and hot air and pulverized coal (PCI charcoal) are blown from the tuyere at the lower side of the side as auxiliary fuel.
- PCI charcoal pulverized coal
- an object of the present invention is to provide a blast furnace facility that can reduce the manufacturing cost of pig iron.
- a blast furnace facility for solving the above-described problems includes a blast furnace main body, raw material charging means for charging a raw material from the top into the blast furnace main body, and a blade inside the blast furnace main body.
- the pulverized coal supply means includes low-grade coal A water removal means for evaporating water, a carbonization means for carbonizing the coal from which water has been removed by the water removal means, a cooling means for cooling the coal carbonized by the carbonization means, and cooling by the cooling means
- Pulverizing means for pulverizing the coal a storage tank for storing the coal pulverized by the pulverizing means, and transporting the coal pulverized by the pulverizing means to the storage tank with an inert gas flow hand
- it comprises a feed means for feeding the coal in the reservoir tank
- the blast furnace equipment according to a second invention is characterized in that, in the first invention, the dry distillation means heats the coal at 400 to 600 ° C.
- the blast furnace equipment according to a third invention is characterized in that, in the first or second invention, the cooling means cools the coal to 200 ° C. or less in an inert gas atmosphere. .
- the blast furnace equipment is that, in any one of the first to third aspects, the pulverizing means pulverizes the coal to a diameter of 100 ⁇ m or less in an inert gas atmosphere.
- the blast furnace equipment according to a fifth invention is characterized in that, in any of the first to fourth inventions, the low-grade coal is subbituminous coal or lignite.
- a blast furnace facility is the blast furnace equipment according to any one of the first to fifth inventions, wherein the pulverized coal has an oxygen atom content ratio (dry base) of 10 to 20% by weight. It has an average pore diameter of 10 to 50 nm.
- low-grade coal is dried and dry-distilled to form dry-distilled coal having a high reaction activity with oxygen, cooled and pulverized, and then transported in a nitrogen gas stream into the storage tank.
- PCI charcoal By storing it, it can be used as PCI charcoal while imparting high combustion performance to inexpensive low-grade coal, so that it is possible to reduce the production cost of pig iron and at the same time dry distillation coal and fine powder imparted high combustion performance Since charcoal can be used for short-term storage and short-term transportation without long-term storage and long-term transportation, high safety can be easily ensured.
- a raw material quantitative supply device 111 that quantitatively supplies a raw material 1 such as iron ore, limestone, and coal communicates with the upstream side in the transport direction of a charging conveyor 112 that transports the raw material 1.
- the downstream side in the transport direction of the charging conveyor 112 is in communication with the top of the furnace top hopper 113 at the top of the blast furnace main body 110.
- a hot air supply device 114 for supplying hot air 101 (1000 to 1300 ° C.) is connected to a blow pipe 115 provided at the tuyere of the blast furnace main body 110.
- the raw material charging unit 111, the charging conveyor 112, the furnace top hopper 113 and the like constitute raw material charging means, and the hot air feeding device 114, the blow pipe 115 and the like blow hot air. Is included.
- a steam tube dryer type drying device 122 for evaporating the moisture 3 in the low-grade coal 2 such as subbituminous coal or lignite is disposed.
- Nitrogen gas 102 which is an inert gas
- a nitrogen gas supply source 121 which is an active gas supply means
- water vapor 103 which is a heating medium
- the low-grade coal 2 supplied from the hopper 122a is heated (100 to 200 ° C.) while the inside is in a low-oxygen atmosphere (several percent) and volatilizes at a moisture 3 and relatively low temperature.
- the volatile component 4 is removed from the low-grade coal 2 to produce the dry coal 5, the moisture 3 and the volatile component 4 can be discharged together with the nitrogen gas 102 to the outside. It has become the jar.
- the discharge port of the dry coal 5 of the drying device 122 is connected to the upstream side in the transport direction of the conveyor 141 with a shield hood covering the periphery via a rotary valve 131.
- the nitrogen gas 102 from the nitrogen gas supply source 121 is supplied to the inside of the shield hood of the conveyor 141 so that the inside of the shield hood of the conveyor 141 has a nitrogen gas atmosphere. It has become.
- the downstream side of the conveyor 141 in the conveying direction is connected to the dry coal 5 receiving port of the dry kiln type dry distillation device 123 for carbonizing the dry coal 5 via a rotary valve 132, and the dry distillation device 123 is
- the nitrogen gas 102 is supplied from the nitrogen gas supply source 121 to the inside, and the combustion gas 104 as a heating medium is supplied to an outer jacket fixedly supported, so that the inside is kept in a nitrogen gas atmosphere.
- the dry coal 5 is heated (400 to 600 ° C.) to remove the volatile component 6 that volatilizes at a high temperature from the dry coal 5 to produce the dry-distilled coal 7.
- the volatile component 6 is discharged to the outside together with the nitrogen gas 102. It can be discharged.
- the discharge port of the dry distillation coal 7 of the dry distillation device 123 is connected via a rotary valve 133 to the upstream side in the transport direction of a conveyor 142 with a shield hood covering the periphery.
- the nitrogen gas 102 from the nitrogen gas supply source 121 is supplied to the inside of the shield hood of the conveyor 142 so that the inside of the shield hood of the conveyor 142 has a nitrogen gas atmosphere. It has become.
- the downstream side of the conveyor 142 in the transport direction is connected to the inlet of the dry-distilled coal 7 of the steam-tube dryer type cooling device 124 that cools the dry-distilled coal 7 via a rotary valve 134,
- the nitrogen gas 102 is supplied from the nitrogen gas supply source 121 to the inside, and the cooling water 105 as a cooling medium is supplied to the inside of the coiled cooling pipe disposed in the central portion.
- the dry-distilled coal 7 can be cooled (200 ° C. or lower) while keeping the atmosphere of nitrogen gas.
- the discharge port of the dry distillation coal 7 of the cooling device 124 is connected via a rotary valve 135 to the upstream side in the transport direction of a conveyor 143 with a shield hood that covers the periphery.
- the nitrogen gas 102 from the nitrogen gas supply source 121 is supplied to the inside of the shield hood of the conveyor 143 so that the inside of the shield hood of the conveyor 143 has a nitrogen gas atmosphere. It has become.
- the downstream side of the conveyor 143 in the conveying direction is connected to an inlet of the dry-distilled coal 7 of a mill type pulverizer 125 for pulverizing the dry-distilled coal 7 via a rotary valve 136.
- the dry-distilled coal 7 can be pulverized into pulverized coal 8 (diameter of 100 ⁇ m or less) while the inside is maintained in a nitrogen gas atmosphere with the nitrogen gas fed together with the dry-distilled coal 7.
- the lower part of the pulverizer 125 is connected in the middle of the transfer line 151 from the nitrogen gas supply source 121.
- the transport line 151 is connected to a receiving port of a cyclone separator 152 that is a separating means for separating the pulverized coal 8 from the air flow of the nitrogen gas 102.
- the lower part of the cyclone separator 152 is connected to the upper side of a storage tank 153 that stores the pulverized coal 8, and the storage tank 153 can maintain the inside in a nitrogen gas atmosphere.
- a lower portion of the storage tank 153 is connected to an injection lance 154 connected to the blow pipe 115, and the pulverized coal 8 inside the storage tank 153 is supplied from the injection lance 154 into the blow pipe 115. Be able to.
- reference numeral 110 a denotes a spout for taking out molten pig iron 9.
- the nitrogen gas supply source 121, the drying device 122, the rotary valve 131, etc. constitute water removal means, and the nitrogen gas supply source 121, the dry distillation device 123, and the rotary valve 132 are configured.
- 133, the conveyor 141 and the like constitute dry distillation means, and the nitrogen gas supply source 121, the cooling device 124, the rotary valves 134 and 135, the conveyor 142 and the like constitute cooling means, and the nitrogen gas supply source 121
- the pulverizing device 125, the rotary valve 136, the conveyor 143 and the like constitute pulverizing means, and the nitrogen gas supply source 121, the conveying line 151, the cyclone separator 152 and the like constitute conveying means, and the injection lance 154 Etc. constitute the feeding means.
- the raw material 1 is quantitatively supplied from the raw material quantitative supply device 111, the raw material 1 is supplied into the furnace top hopper 113 by the charging conveyor 112 and charged into the blast furnace main body 110.
- the nitrogen gas 102 is fed from the nitrogen gas supply source 121 and the low-grade coal 2 is fed from the hopper 122a of the drying device 122 into the drying device 122, the low-grade coal 2 is Then, the water vapor 103 is heated (100 to 200 ° C.) through the heating tube in a low oxygen atmosphere (several percent), and the moisture 3 and the volatile component 4 evaporate to go out of the system together with the nitrogen gas 102. By being discharged, it is dried to become dry coal 5.
- the nitrogen gas 102 containing the volatile component 4 is subjected to a purification process after being used as the combustion gas 104 by being burned in a combustion furnace (not shown).
- the dry coal 5 is fed to the conveyor 141 through the rotary valve 131 and is transported in a nitrogen gas atmosphere, and is supplied into the dry distillation apparatus 123 through the rotary valve 132, so that the dry coal 5 is in a nitrogen gas atmosphere.
- the combustion gas 104 is heated through the heating pipe (400 to 600 ° C.), and the volatile component 6 is evaporated and discharged together with the nitrogen gas 102 to be dry-distilled and reacted with oxygen. It becomes dry carbon 7 with high activity.
- the nitrogen gas 102 containing the volatile component 6 is subjected to purification treatment after being used as the combustion gas 104 by being burned in a combustion furnace (not shown).
- the dry-distilled coal 7 is fed to the conveyor 142 via the rotary valve 133 and conveyed in a nitrogen gas atmosphere, and supplied to the inside of the cooling device 124 via the rotary valve 134, And cooled by the cooling water 105 through the cooling pipe (200 ° C. or less), then fed to the conveyor 143 through the rotary valve 135 and conveyed in a nitrogen gas atmosphere.
- the pulverized coal (PCI charcoal) 8 is obtained by being supplied into the pulverizer 125 and being pulverized (with a diameter of 100 ⁇ m or less) in a nitrogen gas atmosphere.
- the pulverized coal (PCI charcoal) 8 is air-conveyed through the conveying line 151 from the pulverizer 125 by the nitrogen gas 102 from the nitrogen gas supply source 121, and is fed to the cyclone separator 152 to be nitrogen gas 102. Is stored in the storage tank 153 in a nitrogen gas atmosphere.
- the pulverized coal (PCI charcoal) 8 stored in the storage tank 153 is fed from the injection lance 154 into the blow pipe 115 and fed from the hot air feeding device 114 to the blow pipe 115. It is burned by being supplied into the hot air 101, and becomes a flame at the tip of the blow pipe 115 to form a raceway, and the coal in the raw material 1 in the blast furnace body 110 is burned. Thereby, the iron ore in the raw material 1 is reduced to become pig iron (molten metal) 9 and is taken out from the tap outlet 110a.
- the conventional blast furnace equipment uses high-quality and expensive anthracite or bituminous coal as PCI charcoal, but the blast furnace equipment 100 according to this embodiment uses low-grade coal 2 such as sub-bituminous coal or lignite.
- Low-grade coal 2 such as sub-bituminous coal or lignite.
- Nitrogen gas after cooling to pulverization in a nitrogen gas atmosphere by making dry-distilled and dry-distilled coal 7 having high reactivity with oxygen 7 (approximately 20 times the reactivity of oxygen with low-grade coal 2) By transporting it in an air stream and storing it in the storage tank 153 in a nitrogen gas atmosphere, it is possible to safely use it as PCI charcoal while imparting high combustion performance to an inexpensive low-grade coal 2.
- the inexpensive low-grade coal 2 can be used as the PCI coal 8, and thus the manufacturing cost of the pig iron 9 can be reduced.
- the dry distillation coal 7 and the pulverized coal 8 imparted with high combustion performance can be used for short-term storage and short-term transport without long-term storage and long-term transport, high safety can be easily ensured. .
- pulverized coal having an oxygen atom content (dry base) of 10 to 18% by weight and an average pore size of 10 to 50 nm (nanometer) (preferably 20 to 50 nm (nanometer)) ) 8A is preferable.
- Such pulverized coal (PCI charcoal) 8A is, as shown in FIG. 2, low-grade coal such as subbituminous coal and lignite (oxygen atom content (dry base): more than 18% by weight, average pore diameter: 3 to 4 nm) 2 is heated (110 to 200 ° C. ⁇ 0.5 to 1 hour) in a low oxygen atmosphere (oxygen concentration: 5% by volume or less) and dried (drying step S11) to remove moisture, and then low By heating (460 to 590 ° C. (preferably, 500 to 550 ° C.) ⁇ 0.5 to 1 hour) in an oxygen atmosphere (oxygen concentration: 2% by volume or less) and dry distillation (dry distillation step S12), product water And carbon dioxide, tar, etc.
- low-grade coal such as subbituminous coal and lignite (oxygen atom content (dry base): more than 18% by weight, average pore diameter: 3 to 4 nm) 2 is heated (110 to 200 ° C. ⁇ 0.5 to
- the average pore diameter is 10 to 50 nm, that is, tar-generating groups such as oxygen-containing functional groups (carboxyl group, aldehyde group, ester group, hydroxyl group, etc.) are removed.
- oxygen-containing functional groups carboxyl group, aldehyde group, ester group, hydroxyl group, etc.
- the oxygen atom content rate dry base
- the main skeleton combustion components centered on C, H, and O
- the hot air when hot air is blown from the tuyere into the main body of the blast furnace, it contains not only oxygen atoms in the main skeleton, but also oxygen in the hot air easily diffuses into the inside due to the large diameter pores. Since tar is hardly generated, complete combustion can be performed with almost no unburned carbon (soot), and combustion efficiency can be improved at low cost.
- the said pulverized coal (PCI charcoal) 8A has an average pore diameter of 10 nm or more, the ease of diffusing oxygen in the hot air is reduced, resulting in a decrease in combustibility. Since it can be suppressed and the average pore diameter is 50 nm or less, it can be suppressed from becoming cracked and fine due to heat shock or the like, so when blown into the inside of the blast furnace main body, it is cracked and becomes fine. It can be suppressed that the gas is discharged without passing through the inside of the blast furnace body while riding on the gas flow and burning.
- the said pulverized coal (PCI charcoal) 8A has an oxygen atom content ratio (dry base) of 10% by weight or more, it can be completely burned without containing an oxidant or oxygen enrichment of hot air. Can do.
- the pulverized coal (PCI charcoal) 8A preferably has a pore volume of 0.05 to 0.5 cm 3 / g, and particularly preferably 0.1 to 0.2 cm 3 / g. Because, if it is less than 0.05 cm 3 / g, the contact area with oxygen in the hot air (reaction area) is small, which may cause a decrease in combustibility, whereas if it exceeds 0.5 cm 3 / g, This is because the volatilization of many components results in excessively porous components due to being too porous.
- the pulverized coal (PCI charcoal) 8A preferably has a specific surface area of 1 to 100 m 2 / g, and particularly preferably 5 to 20 m 2 / g. Because, if it is less than 1 m 2 / g, the contact area (reaction area) with oxygen in the hot air is small, which may cause a decrease in combustibility, while if it exceeds 100 m 2 / g, many components This is because the volatilization of the fuel is too porous and the combustion components become too small.
- the carbonization temperature in the carbonization step S12 is 460 to 590 ° C.
- pulverized coal (PCI charcoal) 8B having an oxygen atom content ratio (dry base) of 12 to 20% by weight and an average pore diameter of 10 to 50 nm (preferably 20 to 50 nm) is more preferable.
- Such pulverized coal (PCI charcoal) 8B is obtained by drying the low-grade coal (oxygen atom content (dry base): more than 18% by weight) 2 in the same manner as described above (drying).
- Step S11 carbonized in the same manner as described above (Cryogenic step S12), cooled (50 to 150 ° C.) in a low oxygen atmosphere (oxygen concentration: 2% by volume or less) (cooling step S23), and then an oxygen-containing atmosphere
- oxygen is chemically adsorbed and partially oxidized (partial oxidation step S25) by exposure to medium (oxygen concentration: 5 to 21% by volume) (50 to 150 ° C. ⁇ 0.5 to 10 hours), the same as described above
- fine pulverization step S14 finely pulverizing
- the average pore diameter is 10 to 50 nm, that is, the oxygen-containing functional group (carboxyl group, aldehyde group, ester group, hydroxyl group, etc.) like the pulverized coal 8A.
- the oxygen atom content dry base
- the oxygen atom content dry base
- a combustion component centered on the main skeleton C, H, O
- the main skeleton is more oxygen than in the case of the pulverized coal 8A.
- the oxygen of the hot air easily diffuses into the inside due to the large-diameter pores, but also the tar content is hardly generated. Therefore, it is possible to complete combustion without generating more unburned carbon (soot) than in the case of the pulverized coal 8A, and to improve the combustion efficiency at a lower cost than in the case of the pulverized coal 8A. Is more certain.
- the pulverized coal (PCI charcoal) 8B has an average pore diameter of 10 nm or more, like the pulverized coal 8A, the ease of diffusing oxygen in the hot air is reduced, and the combustibility is reduced.
- the pulverized coal 8A since the average pore diameter is 50 nm or less, it is possible to suppress cracking and becoming fine due to heat shock or the like. Therefore, when blown into the inside of the blast furnace body, it can be suppressed that it breaks and becomes fine, and it passes through the inside of the blast furnace body while riding on the gas stream and is discharged without burning. Can be suppressed.
- the oxygen atom content ratio (dry base) is 20% by weight or less, so that the oxygen content is too much and the calorific value becomes too low. Can be suppressed.
- the pulverized coal (PCI coal) 8B like the pulverized coal 8A, pore volume, preferable to be 0.05 ⁇ 0.5cm 3 / g, particularly 0.1 ⁇ 0.2 cm 3 / Very preferably g. Because, if it is less than 0.05 cm 3 / g, the contact area with oxygen in the hot air (reaction area) is small, which may cause a decrease in combustibility, whereas if it exceeds 0.5 cm 3 / g, This is because the volatilization of many components results in excessively porous components due to being too porous.
- the pulverized coal (PCI charcoal) 8B like the pulverized coal 8A, preferably has a specific surface area of 1 to 100 m 2 / g, particularly preferably 5 to 20 m 2 / g. Because, if it is less than 1 m 2 / g, the contact area (reaction area) with oxygen in the hot air is small, which may cause a decrease in combustibility, while if it exceeds 100 m 2 / g, many components This is because the volatilization of the fuel is too porous and the combustion component becomes too small.
- the treatment temperature in the partial oxidation step S25 is 50 to 150 ° C., carbon monoxide and carbon dioxide are generated by the combustion reaction even in an air (oxygen concentration: 21% by volume) atmosphere. This can be suppressed, and the partial oxidation treatment can surely proceed even in an atmosphere having an oxygen concentration of about 5% by volume.
- the blast furnace equipment according to the present invention can reduce the production cost of pig iron, it can be used extremely beneficially in the steel industry.
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Abstract
Description
本発明に係る高炉設備の主な実施形態を図1に基づいて説明する。
2 低品位石炭
3 水分
4,6 揮発成分
5 乾燥石炭
7 乾留石炭
8,8A,8B 微粉炭(PCI炭)
9 銑鉄(溶銑)
100 高炉設備
101 熱風
102 窒素ガス
103 水蒸気
104 燃焼ガス
105 冷却水
110 高炉本体
110a 出銑口
111 原料定量供給装置
112 装入コンベア
113 炉頂ホッパ
114 熱風送給装置
115 ブローパイプ
121 窒素ガス供給源
122 乾燥装置
122a ホッパ
123 乾留装置
124 冷却装置
125 粉砕装置
131~136 ロータリバルブ
141~143 コンベア
151 搬送ライン
152 サイクロンセパレータ
153 貯留タンク
154 インジェクションランス
Claims (6)
- 高炉本体と、
前記高炉本体の内部に頂部から原料を装入する原料装入手段と、
前記高炉本体の内部に羽口から熱風を吹き込む熱風吹込み手段と、
前記高炉本体の内部に前記羽口から微粉炭を供給する微粉炭供給手段と
を備えている高炉設備において、
前記微粉炭供給手段が、
低品位石炭中の水分を蒸発させる水分除去手段と、
前記水分除去手段で水分を除去された前記石炭を乾留する乾留手段と、
前記乾留手段で乾留された前記石炭を冷却する冷却手段と、
前記冷却手段で冷却された前記石炭を粉砕する粉砕手段と、
前記粉砕手段で粉砕された前記石炭を貯留する貯留タンクと、
前記粉砕手段で粉砕された前記石炭を前記貯留タンク内へ不活性ガスで気流搬送する搬送手段と、
前記高炉本体の内部に吹き込まれる前記熱風に前記貯留タンク内の前記石炭を送給する送給手段と
を備えていることを特徴とする高炉設備。 - 請求項1に記載の高炉設備において、
前記乾留手段が、前記石炭を400~600℃で加熱するものである
ことを特徴とする高炉設備。 - 請求項1又は請求項2に記載の高炉設備において、
前記冷却手段が、前記石炭を不活性ガス雰囲気中で200℃以下に冷却するものである
ことを特徴とする高炉設備。 - 請求項1から請求項3のいずれか一項に記載の高炉設備において、
前記粉砕手段が、前記石炭を不活性ガス雰囲気中で直径100μm以下に粉砕するものである
ことを特徴とする高炉設備。 - 請求項1から請求項4のいずれか一項に記載の高炉設備において、
前記低品位石炭が、亜瀝青炭又は褐炭である
ことを特徴とする高炉設備。 - 請求項1から請求項5のいずれか一項に記載の高炉設備において、
前記微粉炭が、10~20重量%の酸素原子含有割合(ドライベース)を有するものであると共に、10~50nmの平均細孔径を有するものである
ことを特徴とする高炉設備。
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Cited By (5)
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WO2014045877A1 (ja) * | 2012-09-20 | 2014-03-27 | 三菱重工業株式会社 | 高炉設備 |
JP2018016885A (ja) * | 2016-07-15 | 2018-02-01 | Jfeスチール株式会社 | 高炉操業方法 |
CN108884502A (zh) * | 2016-03-29 | 2018-11-23 | 杰富意钢铁株式会社 | 高炉操作方法 |
WO2022011693A1 (zh) * | 2020-07-17 | 2022-01-20 | 北京科技大学 | 高炉喷吹用兰炭的定向制备技术及高效使用的优化方法 |
CN114561224A (zh) * | 2022-03-11 | 2022-05-31 | 南阳三鑫诚达化工科技有限公司 | 一种低阶煤热解分级分质梯级利用新工艺 |
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JP2013173832A (ja) * | 2012-02-24 | 2013-09-05 | Mitsubishi Heavy Ind Ltd | 改質石炭製造設備 |
CN117004784B (zh) * | 2023-10-07 | 2023-11-28 | 山西建龙实业有限公司 | 一种高炉喷吹煤粉用氮气的预热系统 |
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US20150008626A1 (en) | 2015-01-08 |
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