EP0367745A2 - Verfahren zum Einblasen eines Hilfsbrennstoffs in einen Hochofen - Google Patents

Verfahren zum Einblasen eines Hilfsbrennstoffs in einen Hochofen Download PDF

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Publication number
EP0367745A2
EP0367745A2 EP89870160A EP89870160A EP0367745A2 EP 0367745 A2 EP0367745 A2 EP 0367745A2 EP 89870160 A EP89870160 A EP 89870160A EP 89870160 A EP89870160 A EP 89870160A EP 0367745 A2 EP0367745 A2 EP 0367745A2
Authority
EP
European Patent Office
Prior art keywords
fuel
injected
hot wind
blast furnace
auxiliary fuel
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Withdrawn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
EP89870160A
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English (en)
French (fr)
Other versions
EP0367745A3 (de
Inventor
Arthur Poos
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.)
Centre de Recherches Metallurgiques CRM ASBL
Original Assignee
Centre de Recherches Metallurgiques CRM ASBL
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 Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Publication of EP0367745A2 publication Critical patent/EP0367745A2/de
Publication of EP0367745A3 publication Critical patent/EP0367745A3/de
Withdrawn legal-status Critical Current

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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
    • 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 method for injecting auxiliary fuel into a blast furnace.
  • the auxiliary fuel in particular pulverized coal
  • the hot wind at a temperature between 1000 ° C and 1200 ° C, which is blown into the blast furnace by the wind nozzles.
  • the coal burns, releasing heat and gases, essentially reducing gases CO and H2, in a determined quantity inside the blast furnace.
  • the quantity of pulverized coal that can be injected in this way is limited, firstly because the coal has a cooling effect which lowers the temperature of the flame, and secondly because the combustion of the coal is not complete at high injection rates and therefore causes unburnt and / or soot formation.
  • the object of the present invention is to propose a process which meets this need by simple and advantageous means, which moreover do not require significant transformations of the existing injection installations.
  • a method of injecting auxiliary fuel into a blast furnace in which said auxiliary fuel is injected into a current of hot wind flowing in the direction of at least one nozzle of said blast furnace, is characterized in that injecting a superheating fuel into said hot wind current, upstream of the injection point of said auxiliary fuel.
  • This superheating fuel injected into the hot wind, in accordance with the process of the invention, causes the formation of a "pseudo-plasma", that is to say of a superheated gaseous medium, located at the place where the auxiliary fuel is injected.
  • This pseudo-plasma obtained without consumption of electrical energy, has properties close to those of conventional plasmas and promotes rapid and complete combustion of the auxiliary fuel.
  • the auxiliary fuel can be a solid fuel, a liquid fuel or a gaseous fuel, or else a mixture of several fuels of different types.
  • the superheating fuel can also be a solid fuel, a liquid fuel or a gaseous fuel, or else a mixture of several fuels of different types.
  • the auxiliary fuel and the superheating fuel are injected as they are into the hot wind current, and their combustion is ensured by the oxygen contained in the hot wind.
  • the oxygen contained in the hot wind it may be necessary to increase the oxygen content of this hot wind, depending on the quantities of fuel injected. Any additional oxygen can be injected with the corresponding fuel, preferably in stoichiometric proportion to ensure the desired combustion of said fuel.
  • Another interesting variant of the process of the invention consists in injecting at least one of said fuels, that is to say the auxiliary fuel and / or the superheating fuel, by means of a suitable burner.
  • This burner which can be of any known type, is supplied on the one hand with fuel and on the other hand with oxygen, and it then injects the corresponding fuel into the hot wind current in the form of hot combustion gases.
  • the oxygen content of the hot wind is preferably adapted according to the composition of said combustion gases, and in particular their contents. in reducing gases.
  • the hot wind blown through the nozzles is generally at a temperature between 1000 ° C and 1200 ° C, depending on the type of cowper available.
  • the hot wind consists of air or air enriched with oxygen.
  • the quantity of superheating fuel injected into the hot wind is adjusted so that said hot wind is brought to a temperature between 1500 ° C. and 2500 ° C.
  • FIG. 1 a conventional blast furnace (1), fed in (2) with 1610 kg per ton of pig iron (kg / tf) of good quality agglomerate and with metallurgical coke stabilized and screened at 35 mm.
  • 140 kg / tf of dry pulverized coal containing 25% volatile matter was injected conventionally, in the hot wind (5), for example at the level of the nozzle.
  • To produce a cast iron of the desired quality that is to say containing 5% C and 0.2% Si and having a temperature of 1500 ° C, 334 kg / tf of dry coke was consumed.
  • FIG. 2 illustrates the production of the same quality of pig iron from the same raw materials and in the same blast furnace as in the case of FIG. 1, but using a variant of the process of the present invention.
  • the blast furnace (1) is also loaded with (2) 1,610 kg / tf of good quality agglomerate, as well as metallurgical coke stabilized and screened at 35 mm.
  • the cold wind (4) is formed by mixing 37 m3 N / tf of pure oxygen (4a) and 470 m3 N / tf of air (4b) compressed to a pressure of 4.5 bar.
  • This cold wind (4), oxygenated to 27%, is brought into the cowper (3) at a temperature of 1200 ° C and the resulting hot wind (5) is blown into the blast furnace with a flow rate of 507 m3 N / tf .
  • the pulverized coal was injected by means of an oxy-coal burner (7) of a known type, supplied with oxygen (7a) and pulverized coal (7b).
  • coke oven gas was injected at (8), that is to say upstream of the injection point of the pulverized coal (7), at a rate of 26 m3 N / tf.
  • This injection (8) gave rise to the formation of a "pseudo-plasma" (9), having a temperature of 1700 ° C. and composed of 6.0% H2O; 2.0% CO2; 21.0% WHERE; 71.0% N2. Thanks to this pseudo-plasma, it was possible to inject in (7b) up to 350 kg / tf of pulverized coal with 149 m3 N / tf of oxygen in (7a). As a result, coke consumption has been reduced to 177 kg / tf, a 47% gain in coke compared to the conventional market in Figure 1.
  • the process of the present invention makes it possible to greatly increase the quantity of pulverized coal injected into the blast furnace, compared to the most favorable markets achievable by conventional injection techniques. Comparable results can be achieved for the injection of liquid or gaseous fuel.

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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)
EP19890870160 1988-10-31 1989-10-24 Verfahren zum Einblasen eines Hilfsbrennstoffs in einen Hochofen Withdrawn EP0367745A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8801252A BE1002581A6 (fr) 1988-10-31 1988-10-31 Procede d'injection de combustible auxiliaire dans un haut fourneau.
BE8801252 1988-10-31

Publications (2)

Publication Number Publication Date
EP0367745A2 true EP0367745A2 (de) 1990-05-09
EP0367745A3 EP0367745A3 (de) 1990-09-12

Family

ID=3883706

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890870160 Withdrawn EP0367745A3 (de) 1988-10-31 1989-10-24 Verfahren zum Einblasen eines Hilfsbrennstoffs in einen Hochofen

Country Status (3)

Country Link
EP (1) EP0367745A3 (de)
JP (1) JPH02159309A (de)
BE (1) BE1002581A6 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1015083A3 (fr) * 2002-08-26 2004-09-07 Centre Rech Metallurgique Procede pour accroitre la quantite de charbon consomme aux tuyeres d'un haut-fourneau.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1107131A (en) * 1965-02-16 1968-03-20 British Petroleum Co Improvements relating to the operation of blast furnaces
FR1558425A (de) * 1967-12-13 1969-02-28
DE2206692A1 (de) * 1972-02-12 1973-08-16 Rheinlaender Paul Prof Dr Ing Verfahren und vorrichtung zum betrieb eines hochofens
FR2249955A1 (de) * 1973-11-06 1975-05-30 Messerschmitt Boelkow Blohm
SU600172A1 (ru) * 1976-02-27 1978-03-30 Ленинградский межотраслевой научно-исследовательский институт пищевой промышленности Способ подготовки мелассы к сбраживанию при производстве лимонной кислоты
JPS62192509A (ja) * 1986-02-17 1987-08-24 Kobe Steel Ltd 高炉の微粉炭吹込み方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1107131A (en) * 1965-02-16 1968-03-20 British Petroleum Co Improvements relating to the operation of blast furnaces
FR1558425A (de) * 1967-12-13 1969-02-28
DE2206692A1 (de) * 1972-02-12 1973-08-16 Rheinlaender Paul Prof Dr Ing Verfahren und vorrichtung zum betrieb eines hochofens
FR2249955A1 (de) * 1973-11-06 1975-05-30 Messerschmitt Boelkow Blohm
SU600172A1 (ru) * 1976-02-27 1978-03-30 Ленинградский межотраслевой научно-исследовательский институт пищевой промышленности Способ подготовки мелассы к сбраживанию при производстве лимонной кислоты
JPS62192509A (ja) * 1986-02-17 1987-08-24 Kobe Steel Ltd 高炉の微粉炭吹込み方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 12, no. 47 (C-475)[2894], 12 février 1988; & JP-A-62 192 509 (KOBE STEEL LTD) 24-08-1987 *
SOVIET INVENTIONS ILLUSTRATED, semaine 8534, 3 octobre 1985, Derwent Publications Ltd, Londres, GB; & SU-A-600 172 (FERROUS METALLURGY INST.) 30-01-1985 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1015083A3 (fr) * 2002-08-26 2004-09-07 Centre Rech Metallurgique Procede pour accroitre la quantite de charbon consomme aux tuyeres d'un haut-fourneau.

Also Published As

Publication number Publication date
BE1002581A6 (fr) 1991-04-02
JPH02159309A (ja) 1990-06-19
EP0367745A3 (de) 1990-09-12

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