EP0467375A1 - Blast furnace pulverized coal injection drying apparatus - Google Patents

Blast furnace pulverized coal injection drying apparatus Download PDF

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Publication number
EP0467375A1
EP0467375A1 EP91112059A EP91112059A EP0467375A1 EP 0467375 A1 EP0467375 A1 EP 0467375A1 EP 91112059 A EP91112059 A EP 91112059A EP 91112059 A EP91112059 A EP 91112059A EP 0467375 A1 EP0467375 A1 EP 0467375A1
Authority
EP
European Patent Office
Prior art keywords
gas
blast furnace
pulverized coal
drying
hot gas
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP91112059A
Other languages
German (de)
English (en)
French (fr)
Inventor
Iwao c/o Tokyo Main Office Asada
Takahisa c/o Denka Cons & Eng. Co. Ltd Honma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Denka Consultant and Engineering Co Ltd
Original Assignee
Denka Consultant and Engineering Co Ltd
Kawasaki Steel Corp
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 Denka Consultant and Engineering Co Ltd, Kawasaki Steel Corp filed Critical Denka Consultant and Engineering Co Ltd
Publication of EP0467375A1 publication Critical patent/EP0467375A1/en
Withdrawn legal-status Critical Current

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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

Definitions

  • the present invention relates to a blast furnace pulverized coal injection (PCI) drying apparatus, more specifically to a blast furnace PCI drying apparatus employing and circulating a drying gas of a ground drying mill of the blast furnace PCI drying apparatus and having the circulating gas route equipped with a dehumidifying apparatus.
  • PCI pulverized coal injection
  • Fig. 2 shows a flow sheet of a blasting apparatus for blasting pulverized coal into a blast furnace.
  • Wet coal is fed through metallurgical coal bunker 101 and feed bin 102 into ground drying mill 103, where the wet coal is ground and dried in hot blast to be made into dried pulverized coal.
  • the dried pulverized coal is then transported together with exhaust gas.
  • the drying gas of the ground drying mill is fed, after adding inert gas 107 as a cooling gas for temperature control to the exhaust gas generated by allowing B gas (blast furnace gas) 105a and/or C gas (coke oven gas) 105 to burn with combustion air 106.
  • the drying gas is exhausted from ground drying mill 103 accompanying ground and dried pulverized coal, by drying wet coal in ground drying mill 103.
  • the pulverized coal transported together with the gas is collected with cyclone 111 and bag filter 112, and is stored in pulverized coal storage hopper 113 of the blast furnace PCI apparatus.
  • the exhaust gas separated from the pulverized coal is released from stack 120.
  • the pulverized coal stored in pulverized coal storage hopper 113 is transferred through intermediate tank 114 to injection tank 115. After pressurized by pressure gas 116, the pulverized coal is transferred through pulverized coal feed pipe 118 by carrier gas 117, and is then injected from a tuyere pipe into blast furnace 119.
  • the hot gas generated in hot gas generating furnace 104 is required to cool the hot gas generated in hot gas generating furnace 104 for generation of the gas to be introduced into ground drying mill 103 of wet coal, the hot gas being for drying wet coal, so that a gas of a lower temperature is mixed together.
  • the gas for cooling hot gas of a higher temperature should be inert gas scarcely containing oxygen, in order to prevent coal dust explosion of pulverized coal.
  • inert gas nitrogen gas, combustion exhaust gas and the like are used.
  • the problem concerning the use of nitrogen gas as inert gas for hot gas generating furnaces is an exceedingly high cost of its operation.
  • the use of the exhaust gas after combustion is generally accompanied by the problems that the operation of the combustion apparatus is influential and the layout of a transporting piping route of the exhaust gas is difficult.
  • the circulation of the exhaust gas of a blast furnace PCI drying apparatus causes the increase in the water content in the circulating gas, so the exhaust gas cannot be used constantly.
  • a dehumidifying apparatus is placed on the route where the exhaust gas from a blast furnace PCI drying apparatus is circulated, and the exhaust gas after water is removed therefrom with the dehumidifying apparatus is used as inert gas.
  • the object of the present invention is to provide an apparatus capable of collecting and circulating exhaust gas from an exhaust gas line of a blast furnace PCI drying apparatus with a fan and removing the water in the circulating gas in order that the resulting circulating gas can be used as inert gas for a hot gas generating furnace.
  • the present invention is a blast furnace PCI drying apparatus equipped with a hot gas generating furnace and a ground drying mill for grinding and drying wet coal by introducing the gas generated in a hot gas generating furnace, wherein a branch pipe is placed on a pipe of the exhaust gas after grinding and drying in a pulverized coal ground drying mill and is then linked with a dehumidifying apparatus, and the outlet pipe of the dehumidifying apparatus is connected with the outlet side of the hot gas generating furnace.
  • the outlet side of the hot gas generating furnace means any part of the intermediate route to cool and introduce the gas generated from the hot gas generating furnace into the ground drying mill; in other words, it means that the vicinity of the outlet of the hot gas generating furnace, the intermediate route of the pipe from the hot gas generating furnace to the ground drying mill, and further the vicinity of the inlet of the ground drying mill may be satisfactory.
  • dehumidifying apparatus means an apparatus which can remove water from the exhaust gas from the ground drying mill, but is not necessarily an apparatus which decreases the relative humidity of the exhaust gas.
  • the dehumidifying apparatus may be satisfactorily composed of a scrubber performing the removal of the powder in the exhaust gas and the removal of the water in the exhaust gas by cooling the exhaust gas, on spraying water over the exhaust gas.
  • the present invention is the most characteristic in that in case that a branch pipe is placed in the exhaust gas line of a blast furnace PCI drying apparatus to circulate and use the exhaust gas, a dehumidifying apparatus is placed on the route of the branch pipe to prevent moisture increase in the circulating gas and to enable routine use of the exhaust gas as the circulating gas of the ground drying mill.
  • the increase in water concentration due to the circulation method is suppressed by the decrease in dew point and dewatering with a scrubber, while temperature control is achieved by the circulating gas employing hot gas from the hot gas generating furnace as inert gas.
  • Fig. 1 shows the flow sheet of the example of the present invention.
  • Wet coal 1 as the raw material of a blast furnace PCI is fed into ground drying mill 3.
  • B gas (blast furnace gas) 5a and/or C gas (coke oven gas) 5 are burned with combustion air 6 to generate hot gas, which is then controlled of its temperature with cooling gas to be fed as hot blast into ground drying mill 3.
  • the wet coal is dried and grinded in the ground drying mill while being ground, which is transported together with hot gas from exhaust pipe 7.
  • Dried pulverized coal is collected in bag filter 42, and is stored in pulverized coal storage hopper 43.
  • the exhaust gas separated from pulverized coal is released from stack 20.
  • branch pipe 21 for branching a part or the entire part of the exhaust gas of the blast furnace PCI drying apparatus from exhaust gas line 7, and the exhaust gas is aspirated with fan 22 and is introduced into dehumidifying apparatus 23.
  • dehumidifying apparatus 23 the water in the raw material wet coal introduced in ground drying mill 3 is removed.
  • the gas exhausted from the dehumidifying apparatus 23 is introduced through outlet pipe 24 of the dehumidifying apparatus to the outlet side of hot gas generating furnace 4, to control the temperature of hot gas being fed from hot gas generating furnace 4.
  • the exhaust gas of the blast furnace PCI drying apparatus is circulated as inert gas inside the blast furnace PCI drying apparatus.
  • spray nozzle 25 and filling matter 26 are provided inside the scrubber, to cool the exhaust gas. By this cooling, excess water content in the exhaust gas is removed.
  • the water after cooling the exhaust gas is fed to cooling tower 32, by means of hot water line 30 and hot water pump 31.
  • the water cooled in cooling tower is stored in water pit 33, and is circulated to the spray nozzle through aspiration line 29 and cooling water pipe 27, by means of cooling water pump 28.
  • the water content of wet coal is about 1,500 kg/h, while the saturated water content of the gas at the scrubber inlet is about 22,500 kg/h and the saturated water content of the gas at the scrubber outlet is about 11,700 kg/h. Therefore, the scrubber has sufficient potential of drying wet coal, and the potential of the cooling tower is sufficiently high enough to remove the water content in wet coal.
EP91112059A 1990-07-20 1991-07-18 Blast furnace pulverized coal injection drying apparatus Withdrawn EP0467375A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2190745A JPH0742491B2 (ja) 1990-07-20 1990-07-20 高炉吹込み微粉炭乾燥装置
JP190745/90 1990-07-20

Publications (1)

Publication Number Publication Date
EP0467375A1 true EP0467375A1 (en) 1992-01-22

Family

ID=16263047

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91112059A Withdrawn EP0467375A1 (en) 1990-07-20 1991-07-18 Blast furnace pulverized coal injection drying apparatus

Country Status (6)

Country Link
EP (1) EP0467375A1 (ja)
JP (1) JPH0742491B2 (ja)
AU (1) AU8047191A (ja)
BR (1) BR9103105A (ja)
CA (1) CA2047416A1 (ja)
ZA (1) ZA915501B (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0618302A1 (en) * 1993-03-29 1994-10-05 The Boc Group Plc Metallurgical processes and appartus
LU91451B1 (en) * 2008-06-02 2009-12-03 Wurth Paul Sa Method for producing pulverized coal
LU91450B1 (en) * 2008-06-02 2009-12-03 Wurth Paul Sa Method for producing pulverized coal
CN109733757A (zh) * 2019-01-18 2019-05-10 华电电力科学研究院有限公司 一种煤粉仓充炉烟防爆装置及防爆方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100862774B1 (ko) * 2002-08-06 2008-10-13 주식회사 포스코 미분탄 제조 장치
CN105651035A (zh) * 2016-02-29 2016-06-08 成都绿迪科技有限公司 泥煤干燥装置
CN113457814A (zh) * 2021-06-22 2021-10-01 镇江市蓝火环保能源有限公司 一种煤粉处理方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3306238A (en) * 1965-05-20 1967-02-28 Armco Steel Corp Fuel injection system for blast furnaces
FR2531724A1 (fr) * 1982-08-10 1984-02-17 Kobe Steel Ltd Dispositif de broyage, de sechage et de transport d'un combustible broye destine a un haut fourneau

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61111946U (ja) * 1984-12-26 1986-07-15
JPS62123217A (ja) * 1985-11-22 1987-06-04 Sumitomo Metal Ind Ltd 高炉吹き込み用微粉炭の乾燥方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3306238A (en) * 1965-05-20 1967-02-28 Armco Steel Corp Fuel injection system for blast furnaces
FR2531724A1 (fr) * 1982-08-10 1984-02-17 Kobe Steel Ltd Dispositif de broyage, de sechage et de transport d'un combustible broye destine a un haut fourneau

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0618302A1 (en) * 1993-03-29 1994-10-05 The Boc Group Plc Metallurgical processes and appartus
LU91451B1 (en) * 2008-06-02 2009-12-03 Wurth Paul Sa Method for producing pulverized coal
LU91450B1 (en) * 2008-06-02 2009-12-03 Wurth Paul Sa Method for producing pulverized coal
WO2009147153A1 (en) * 2008-06-02 2009-12-10 Paul Wurth S.A. Method for producing pulverized coal
WO2009147151A1 (en) * 2008-06-02 2009-12-10 Paul Wurth S.A. Method for producing pulverized coal
CN102046758A (zh) * 2008-06-02 2011-05-04 保尔伍斯股份有限公司 制造粉煤的方法
CN102046759A (zh) * 2008-06-02 2011-05-04 保尔伍斯股份有限公司 生产粉煤的方法
US20110192079A1 (en) * 2008-06-02 2011-08-11 Paul Wurth S.A. Method for producing pulverized coal
RU2501839C2 (ru) * 2008-06-02 2013-12-20 Поль Вурт С.А. Способ изготовления угольной пыли
RU2502780C2 (ru) * 2008-06-02 2013-12-27 Поль Вурт С.А. Способ изготовления угольной пыли
AU2009253965B2 (en) * 2008-06-02 2014-12-04 Paul Wurth S.A. Method for producing pulverized coal
TWI466993B (zh) * 2008-06-02 2015-01-01 Wurth Paul Sa 用於製造粉煤之方法
TWI475105B (zh) * 2008-06-02 2015-03-01 Wurth Paul Sa 用於製造粉煤之方法
CN102046759B (zh) * 2008-06-02 2015-09-16 保尔伍斯股份有限公司 生产粉煤的方法
US10059885B2 (en) 2008-06-02 2018-08-28 Paul Wurth S.A. Method for producing pulverized coal
CN109733757A (zh) * 2019-01-18 2019-05-10 华电电力科学研究院有限公司 一种煤粉仓充炉烟防爆装置及防爆方法

Also Published As

Publication number Publication date
CA2047416A1 (en) 1992-01-21
JPH0480307A (ja) 1992-03-13
BR9103105A (pt) 1992-05-05
ZA915501B (en) 1992-04-29
JPH0742491B2 (ja) 1995-05-10
AU8047191A (en) 1992-01-23

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