WO2014027481A1 - 銑鉄製造方法およびこれに使用する高炉設備 - Google Patents

銑鉄製造方法およびこれに使用する高炉設備 Download PDF

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Publication number
WO2014027481A1
WO2014027481A1 PCT/JP2013/062157 JP2013062157W WO2014027481A1 WO 2014027481 A1 WO2014027481 A1 WO 2014027481A1 JP 2013062157 W JP2013062157 W JP 2013062157W WO 2014027481 A1 WO2014027481 A1 WO 2014027481A1
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WIPO (PCT)
Prior art keywords
blast furnace
coal
blowing
hot air
blast
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Application number
PCT/JP2013/062157
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English (en)
French (fr)
Japanese (ja)
Inventor
大本　節男
慶一 中川
務 濱田
雅一 坂口
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三菱重工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱重工業株式会社 filed Critical 三菱重工業株式会社
Priority to IN505DEN2015 priority Critical patent/IN2015DN00505A/en
Priority to KR1020157001014A priority patent/KR101648683B1/ko
Priority to US14/413,879 priority patent/US20150176096A1/en
Priority to CN201380035116.2A priority patent/CN104411837B/zh
Publication of WO2014027481A1 publication Critical patent/WO2014027481A1/ja

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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
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/008—Composition or distribution of the charge
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • C21B7/163—Blowpipe assembly

Definitions

  • the present invention relates to a pig iron manufacturing method and a blast furnace facility used therefor.
  • the blast furnace equipment is charged with iron ore, limestone and coke raw materials from the top of the blast furnace main body, and hot blast and auxiliary fuel (pulverized coal) as hot air and auxiliary fuel from the tuyere near the side of the blast furnace main body. ) Can be produced from iron ore.
  • a pulverized coal ash with a softening point of less than 1300 ° C. is added with a CaO source mineralizer such as limestone or serpentine, and the ash softening point in the pulverized coal is adjusted to 1300 ° C. or higher. It has been proposed to improve the combustibility of blast furnace infused coal by blowing only pulverized coal having an ash softening point of 1300 ° C. or higher into the interior from the tuyere of the blast furnace body (for example, the following) Patent Document 1).
  • the amount of enriched oxygen can be increased or decreased, or the composition and particle size of the pulverized coal can be adjusted to make it more difficult to burn.
  • a blast furnace pulverized coal injection operation method that can improve the air permeability even in an extremely large operation has been proposed (for example, see Patent Document 2 below).
  • Japanese Patent Laid-Open No. 5-156330 see, for example, paragraphs [0014]-[0023], [FIG. 1], etc.
  • the blast furnace pulverized coal blowing method described in Patent Document 1 uses only pulverized coal that has been subjected to an adjustment treatment of the ash softening point to 1300 ° C. or higher by adding a slagging agent as described above. This increases the running cost.
  • An object of the present invention is to provide a pig iron production method and a blast furnace facility using the pig iron production method capable of suppressing the blockage caused by the coal ash and reducing the production cost of the pig iron.
  • the pig iron manufacturing method according to the first invention that solves the above-described problem is to charge a raw material containing iron ore and coal from the top of the blast furnace main body into the inside, and hot air and blast furnace blowing from the tuyere of the blast furnace main body to the inside.
  • the blast furnace blowing coal has an oxygen atom content (dry base) of 10% by weight to 20% by weight and an average pore diameter.
  • the melting point of ash in the blast furnace blowing coal is measured in advance, and the temperature of the hot air is adjusted to a temperature lower by 100 to 150 ° C. than the melting point of the ash.
  • the pig iron manufacturing method according to the second invention for solving the above-mentioned problem is the pig iron manufacturing method according to the first invention described above, wherein the hot air is enriched with oxygen at the tuyere of the blast furnace body. It is characterized by.
  • a blast furnace facility for solving the above-described problem includes a blast furnace main body, raw material charging means for charging a raw material containing iron ore and coal from the top of the blast furnace main body, and a wing of the blast furnace main body.
  • a blast furnace facility according to a fourth invention for solving the above-described problem is the blast furnace facility according to the third invention described above, wherein the hot air is enriched with oxygen at the tuyere of the blast furnace body.
  • the apparatus further comprises means.
  • a blast furnace facility according to a fifth invention that solves the above-described problem is a blast furnace facility according to the fourth invention described above, wherein the oxygen enrichment means includes an injection lance through which the oxygen flows.
  • the distal end portion of the injection lance is arranged on the inner side of the blast furnace main body than the proximal end side of the tuyere of the blast furnace main body.
  • the blast furnace blown coal having an oxygen atom content ratio (dry base) of 10 to 20% by weight and an average pore diameter of 10 to 50 nm, that is, Although tar-generating groups such as oxygen-containing functional groups (carboxyl group, aldehyde group, ester group, hydroxyl group, etc.) are eliminated and greatly reduced, decomposition of the main skeleton (combustion component centering on C, H, O) Since the blast furnace blown coal, in which (decrease) is greatly suppressed, is blown into the blast furnace body with hot air adjusted to a temperature lower by 100 to 150 ° C.
  • the temperature of the blast furnace blown coal becomes lower than the melting point of the ash in the blast furnace blown coal, and the adhesion of the blast furnace blown coal ash or the blockage by the blast furnace blown coal ash can be suppressed in the path leading to the inside of the blast furnace main body. . Therefore, stable operation of the blast furnace facility becomes possible. Since the ash in the blast furnace blowing coal is blown into the blast furnace main body together with the hot air without melting, low-grade coal such as inexpensive subbituminous coal and lignite can be used as blast furnace blowing coal. The manufacturing cost of pig iron can be reduced.
  • a raw material quantitative supply device 111 that quantitatively supplies a raw material 1 containing iron ore and coke 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 feeding device 116 for feeding hot air 101 is connected to a blow pipe 117 provided at the tuyere 118 of the blast furnace main body 110.
  • a supply hopper 120 for supplying the blast furnace blowing coal 11 is disposed in the vicinity of the blast furnace main body 110.
  • the blast furnace-blown coal 11 has an oxygen atom content (dry base) of 10 to 18% by weight and an average pore diameter of 10 to 50 nm (preferably 20 to 50 nm).
  • the blast furnace blown coal 11 is generally low-grade coal having a low ash melting point (for example, 1200 ° C.) such as subbituminous coal or lignite (oxygen atom content ratio (dry base): more than 18% by weight, average pore diameter: 3).
  • a low ash melting point for example, 1200 ° C.
  • lignite oxygen atom content ratio (dry base): more than 18% by weight, average pore diameter: 3
  • a low oxygen atmosphere oxygen concentration: 5% by volume or less
  • oxygen oxygen concentration: 5% by volume or less
  • a low oxygen atmosphere (oxygen) Concentration: 2% by volume or less) by heating (460 to 590 ° C. (preferably 500 to 550 ° C.) ⁇ 0.5 to 1 hour) and subjecting to dry distillation, water, carbon dioxide, tar content, etc. It can be easily manufactured by removing it as dry-distilled oil and then cooling (50 ° C. or less) in a low oxygen atmosphere (oxygen concentration: 2% by
  • the lower part of the supply hopper 120 communicates with the proximal end side of the belt conveyor 121 that conveys the blast furnace blowing coal 11 from the supply hopper 120.
  • the front end side of the belt conveyor 121 communicates with an upper portion of a receiving hopper 122 that receives the blast furnace blowing charcoal 11.
  • the lower part of the receiving hopper 122 is connected to an upper inlet of a coal mill 123 that pulverizes the blast furnace blown coal 11 from the receiving hopper 122 into a predetermined diameter size (for example, 80 ⁇ m or less).
  • a nitrogen gas supply source 124 for supplying nitrogen gas 102 which is an inert gas is connected to the lower side of the side of the coal mill 123.
  • a base end side of a conveying line 125 for conveying the pulverized blast furnace blown coal 11 by air flow with the nitrogen gas 102 is connected.
  • the front end side of the transfer line 125 is connected to a cyclone separator (or bag filter) 126 that separates the blast furnace blowing coal 11 and the nitrogen gas 102.
  • a lower part of the cyclone separator 126 communicates with an upper part of a storage hopper 127 that stores the blast furnace blowing coal 11.
  • the lower part of the storage hopper 127 is connected to the upper side of the injection tank 128.
  • the nitrogen gas supply source 124 is connected to the lower side of the side of the injection tank 128.
  • An upper portion of the injection tank 128 is connected to an injection lance 129 connected to the blow pipe 117.
  • the injection tank 128 is connected to the injection lance 129.
  • the blast furnace blown charcoal 11 supplied into the tank 128 can be conveyed by airflow and supplied from the injection lance 129 into the blow pipe 117.
  • a hot air temperature control device 115 is connected to the hot air supply device 116.
  • a hot air supply source 114 is connected to the hot air temperature control device 115.
  • the hot air temperature control device 115 adjusts the melting point of the ash (blast furnace blown coal ash) of the blast furnace blown coal 11 obtained by measuring the melting point of the ash (blast furnace blown coal ash) of the blast furnace blown coal 11 in advance. Based on this, the hot air sent from the hot air supply source 114 is adjusted to a temperature 100 to 150 ° C. lower than the melting point of the ash. For example, when the melting point of the ash of the blast furnace blowing coal 11 (blast furnace blowing coal ash) is 1200 ° C., the hot air temperature control device 115 adjusts the hot air to 1050 to 1100 ° C.
  • reference numeral 110 a denotes a tap hole for taking out molten pig iron (molten metal) 2.
  • the raw material charging unit 111, the charging conveyor 112, the furnace top hopper 113 and the like constitute raw material charging means
  • the hot air feeding device 116, the blow pipe 117, and the like constitute hot air blowing means
  • the line 125, the cyclone separator 126, the storage hopper 127, the injection tank 128, the injection lance 129, the blow pipe 117, and the like constitute a blast furnace infused coal supply means.
  • the hot air temperature control device 115 and the like constitute hot air temperature control means.
  • the melting point of the ash (blast furnace blown coal ash) of the blast furnace blown coal 11 is measured in advance.
  • 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 blast furnace blowing coal 11 is introduced into the supply hopper 120, the blast furnace blowing coal 11 is supplied to the receiving hopper 122 via the belt conveyor 121, It is pulverized to a predetermined diameter size (for example, 80 ⁇ m or less).
  • the nitrogen gas 102 flows into the cyclone separator 126 via the transfer line 125 by air-transporting the pulverized blast furnace blowing charcoal 11. And the blast furnace blown coal 11 is separated and then discharged out of the system.
  • the blast furnace blown coal 11 separated by the cyclone separator 126 is stored in the storage hopper 127 and then supplied into the injection tank 128, and the nitrogen gas 102 from the nitrogen gas supply source 124 supplies the The air is conveyed to the injection lance 129 and supplied into the blow pipe 117.
  • the hot air 101 adjusted to a temperature lower by 100 to 150 ° C. than the melting point of the ash of the blast furnace blown coal 11 (blast furnace blown coal ash) from the hot air supply device 116 to the blow pipe 117 is, for example, a gas
  • the blast furnace blown coal 11 is preheated and ignited, becomes a flame at the tip of the blow pipe 117 and burns in the raceway, and the raw material in the blast furnace body 110 It reacts with coke in 1 to generate reducing gas.
  • the iron ore in the raw material 1 is reduced to become pig iron (molten metal) 2 and is taken out from the tap outlet 110a.
  • the oxygen gas concentration of the hot air 101 is adjusted to 28%, for example.
  • the blast furnace blown coal 11 has an average pore diameter of 10 to 50 nm, that is, a large amount of tar-generating groups such as oxygen-containing functional groups (carboxyl group, aldehyde group, ester group, hydroxyl group, etc.) are eliminated. Although it has decreased, the oxygen atom content rate (dry base) is 10 to 18% by weight, that is, the decomposition (reduction) of the main skeleton (combustion components centering on C, H, O) is greatly suppressed. Yes.
  • the main skeleton contains a large amount of oxygen atoms, and the oxygen in the hot air 101 is contained inside by pores having a large diameter.
  • the tar is very unlikely to be produced, so that it can be completely burned with almost no unburned carbon (soot).
  • the hot air 101 measures the melting point of the ash in the blast furnace blowing coal 11 in advance, and sends the hot air 101 lowered by 100 to 150 ° C. to the melting point of the ash to the blow pipe 117.
  • Charcoal 11 ash blast furnace blown coal ash
  • Charcoal 11 ash does not melt and adhere to the inner surfaces of the injection lance 129 and tuyere 118. That is, it is possible to suppress adhesion of blast furnace blown coal ash or blockage due to blast furnace blown coal ash on the route from which the blast furnace blown coal 11 reaches the inside of the blast furnace main body 110. Therefore, stable operation of the blast furnace equipment 100 is possible.
  • the average pore diameter needs to be 10 to 50 nm (preferably 20 to 50 nm). This is because if the thickness is less than 10 nm, the ease of diffusion of oxygen in the hot air 101 is reduced, causing a decrease in combustibility, whereas if it exceeds 50 nm, it tends to crack and become finer. This is because if the gas is blown into the interior of the blast furnace 110 and cracks and becomes fine, it passes through the interior of the blast furnace body 110 while riding on the gas stream and is discharged without burning.
  • the oxygen atom content (dry base) needs to be 10% by weight or more. This is because if it is less than 10% by weight, it becomes difficult to completely burn without containing an oxidizing agent or enriching hot air with oxygen.
  • the dry distillation temperature needs to be 460 to 590 ° C. (preferably 500 to 550 ° C.). This is because if the temperature is lower than 460 ° C., tar-generating groups such as oxygen-containing functional groups cannot be sufficiently removed from the low-grade coal, and it becomes very difficult to make the average pore diameter 10 to 50 nm. On the other hand, if the temperature exceeds 590 ° C., the decomposition of the main skeleton of the low-grade coal (combustion components centered on C, H, O) starts to become remarkable, and the combustion components are excessively reduced.
  • the blast furnace facility 200 includes an oxygen-enriched injection lance 214 provided in connection with a blow pipe 117 as shown in FIGS.
  • the proximal end of the oxygen-enriched injection lance 214 is connected to the oxygen gas feeding device 213.
  • the oxygen gas supply device 213 is connected to the oxygen gas temperature control device 212.
  • the oxygen gas temperature control device 212 is connected to the oxygen gas supply source 211.
  • the distal end portion 214 a of the oxygen-enriched injection lance 214 is positioned on the inner side of the blast furnace main body 110 than the proximal end portion 118 a of the tuyere 118 of the blast furnace main body 110.
  • the hot air 101 can be oxygen-enriched in the vicinity of the tuyere 118 of the blast furnace main body 110, and the combustion start timing of the blast furnace blowing coal 11 can be delayed. That is, in the blow pipe 117, adhesion of blast furnace blown coal ash due to combustion of the blast furnace blown coal 11 or blockage by blast furnace blown coal ash can be suppressed.
  • the oxygen gas supply source 211, the oxygen gas temperature control device 212, the oxygen gas supply device 213, the oxygen enrichment injection lance 214, etc. constitute oxygen enrichment means. Yes.
  • the melting point of the ash (blast furnace blown coal ash) of the blast furnace blown coal 11 is measured in advance.
  • the blast furnace blown coal 11 passes through the supply hopper 120, the baltic conveyor 121, the receiving hopper 122, the coal mill 123, the cyclone separator 126, and the storage hopper 127 in the same manner as the above-described embodiment. Then, the air is supplied into the injection tank 128, is conveyed to the injection lance 129 by the nitrogen gas 102 from the nitrogen gas supply source 124, and is supplied into the blow pipe 117.
  • the hot air 101 from the hot air supply source 114 is adjusted by the hot air temperature control device 115 to a temperature lower by 100 to 150 ° C. than the melting point of the ash of the blast furnace blowing coal 11 (blast furnace blowing coal ash).
  • the hot air supply device 116 supplies the blow pipe 117 with, for example, a gas flow rate of 240 m / s, and the oxygen gas 103 from the oxygen gas supply source 211 has the same temperature as the hot air 101 in the oxygen gas temperature control device 212. And is supplied to the blow pipe 117 via the oxygen enrichment injection lance 214 by the oxygen gas feeding device 213.
  • the blast furnace injection charcoal 11 is preheated and ignited, becomes a flame at the tip of the blow pipe 117 and burns in the raceway, and reacts with coke and the like in the raw material 1 in the blast furnace main body 110.
  • the iron ore in the raw material 1 is reduced to become pig iron (molten metal) 2 and is taken out from the tap outlet 110a.
  • the total of the oxygen concentration of the hot air 101 and the oxygen concentration of the oxygen gas is adjusted to 28%, for example.
  • the hot air 101 measures the melting point of the ash in the blast furnace blowing coal 11 in advance, and sends the hot air 101 lowered by 100 to 150 ° C. to the melting point of the ash to the blow pipe 117.
  • Charcoal 11 ash (blast furnace blown coal ash) does not melt and adhere to the inner surfaces of the injection lance 129 and tuyere 118. That is, it is possible to suppress adhesion of blast furnace blown coal ash or blockage due to blast furnace blown coal ash on the route from which the blast furnace blown coal 11 reaches the inside of the blast furnace main body 110. Therefore, stable operation of the blast furnace facility 200 is possible.
  • the oxygen-enriched injection lance 214 is provided in the blow pipe 117, the oxygen concentration of the hot air 101 is reduced compared to the above-described embodiment in which only the hot air 101 is supplied to the blow pipe 117. Since the oxygen can be enriched by the oxygen-enriched injection lance 214, the combustion start timing of the blast furnace blown coal 11 can be delayed. Therefore, adhesion of blast furnace blown coal ash or blockage due to blast furnace blown coal ash can be more reliably suppressed in a route from the blast furnace blown coal to the inside of the blast furnace main body.
  • the method for producing pig iron according to the present invention and the blast furnace equipment used for the same suppress the adhesion of blast furnace blown coal ash or blockage due to the blast furnace blown coal ash in the path where the blast furnace blown coal reaches the inside of the blast furnace main body.
  • the manufacturing cost can be reduced, so that it can be used extremely beneficially in the steel industry.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)
  • Blast Furnaces (AREA)
PCT/JP2013/062157 2012-08-13 2013-04-25 銑鉄製造方法およびこれに使用する高炉設備 WO2014027481A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
IN505DEN2015 IN2015DN00505A (enrdf_load_stackoverflow) 2012-08-13 2013-04-25
KR1020157001014A KR101648683B1 (ko) 2012-08-13 2013-04-25 선철 제조 방법 및 당해 방법에 사용하는 용광로 설비
US14/413,879 US20150176096A1 (en) 2012-08-13 2013-04-25 Method for producing pig iron, and blast furnace to be used therefor
CN201380035116.2A CN104411837B (zh) 2012-08-13 2013-04-25 生铁制造方法及用于该方法的高炉设备

Applications Claiming Priority (2)

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JP2012-179239 2012-08-13
JP2012179239A JP5958935B2 (ja) 2012-08-13 2012-08-13 銑鉄製造方法およびこれに使用する高炉設備

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JP (1) JP5958935B2 (enrdf_load_stackoverflow)
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CN (1) CN104411837B (enrdf_load_stackoverflow)
IN (1) IN2015DN00505A (enrdf_load_stackoverflow)
WO (1) WO2014027481A1 (enrdf_load_stackoverflow)

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US9556497B2 (en) * 2012-01-18 2017-01-31 Mitsubishi Heavy Industries, Ltd. Blast furnace

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KR20150020248A (ko) 2015-02-25
JP2014037559A (ja) 2014-02-27
CN104411837B (zh) 2016-05-18
KR101648683B1 (ko) 2016-08-16
US20150176096A1 (en) 2015-06-25
CN104411837A (zh) 2015-03-11
IN2015DN00505A (enrdf_load_stackoverflow) 2015-06-26
JP5958935B2 (ja) 2016-08-02

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