EP0255154B1 - Verfahren zur Direktreduktion von eisenoxidhaltigen Materialien im Drehrohrofen - Google Patents

Verfahren zur Direktreduktion von eisenoxidhaltigen Materialien im Drehrohrofen Download PDF

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Publication number
EP0255154B1
EP0255154B1 EP87201059A EP87201059A EP0255154B1 EP 0255154 B1 EP0255154 B1 EP 0255154B1 EP 87201059 A EP87201059 A EP 87201059A EP 87201059 A EP87201059 A EP 87201059A EP 0255154 B1 EP0255154 B1 EP 0255154B1
Authority
EP
European Patent Office
Prior art keywords
blown
rotary kiln
coarser
fraction
finer
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.)
Expired - Lifetime
Application number
EP87201059A
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German (de)
English (en)
French (fr)
Other versions
EP0255154A1 (de
Inventor
Gerd Elsenheimer
Wolfram D. Schnabel
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.)
GEA Group AG
Original Assignee
Metallgesellschaft AG
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
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces

Definitions

  • the invention relates to a process for the direct reduction of iron oxide-containing materials to sponge iron in a rotary tube furnace, the feed being passed through the rotary tube furnace in countercurrent to the gas atmosphere, solid carbonaceous reducing agent with a high content of volatile constituents separated into a coarser and a finer fraction and partly , is charged into the loading end of the rotary kiln, and the outer part is blown through the discharge end of the rotary kiln and is distributed over part of the length of the kiln to the feed and oxygen-containing gases are introduced into the rotary kiln at several points through the jacket.
  • the zone of the rotary kiln before the discharge end of the kiln is particularly sensitive to temperature fluctuations and carbon depletion in the material bed. This can lead to fluctuations in the degree of metallization, formation of deposits in the furnace and increased heat consumption.
  • CA-PS 872 728 From CA-PS 872 728 it is known to blow coal with a grain size up to 6 mm into the discharge end with a blowing device and to feed the remaining coal into the loading end, but the grain size below 1 mm is also blown in from the discharge end.
  • the object of the invention is to maintain optimal operating conditions in the end zone of the rotary kiln by keeping the temperature and the carbon content in the feed largely constant.
  • the portion of the solid reducing agent which is up to 50% of the total reducing agent addition and which is blown into the discharge end of the rotary kiln with a blowing device is a mixture of 10-40% finer fraction below 3-5 mm grain size and 90 - 60% coarser fraction is above 3 - 5 mm grain size and, calculated from the discharge end, up to a maximum of 50% of the furnace length is distributed and the remaining solid, carbon-containing material is charged into the loading end of the rotary kiln.
  • the solid, carbon-containing reducing agent contains more than 20% of flammable, volatile components. A part with a lower volatile content can also be inserted in the loading end of the furnace.
  • the oxygen-containing gases generally air
  • air are blown in through jacket pipes, the outlet openings of which lie in the longitudinal axis of the furnace, and / or through nozzle stones, the outlet openings of which lie approximately in the lining of the furnace.
  • air is expediently introduced through the air tube of the central burner.
  • the central burner is used to heat the furnace during commissioning and standstills, but can also be switched on briefly to increase the temperature.
  • the coarser and the finer fraction can be generated by separating the entire solid reducing agent or a partial stream. The separation is advantageously carried out on vibrating screens. The amount of finer and coarser fraction that is not needed for blowing is charged into the feed end.
  • the reducing agent which is not subjected to this separation, may also be charged into the loading end.
  • the furnace length over which the reducing agent is blown is calculated from the end of the discharge.
  • the proportion of finer fraction in the blown mixture is selected in the upper range if the content of volatile constituents in the reducing agent is relatively low, since then a larger one Amount of fine-grained reducing agent to cover the heat needs must be burned.
  • the proportion is selected in the lower range if the volatile component content is relatively high, since more heat is then covered by the combustion of the volatile components expelled.
  • the screen cut for the separation of the reducing agent is selected depending on the reactivity of the coal, its volatile content and the required operating conditions in the furnace. At low throughputs of the rotary kiln, the percentage of the blown carbonaceous material in the total amount used is in the upper range.
  • the solid carbonaceous material is separated into a coarser and a finer fraction by sieving with a certain sieve size in the range of 3 to 5 mm.
  • a preferred embodiment is that the mixture of the blown carbon-containing material consists of 15-30% finer fraction and 85 to 70% coarser fraction. In most cases, this mixing ratio results in particularly good operating conditions.
  • a preferred embodiment is that the amount of the mixture of solid carbonaceous material blown in is 15-30% of the total carbonaceous material fed.
  • One embodiment consists in that the upper grain size of the blown coarser fraction is limited and the coarse grain above it is separated off and charged into the loading end of the rotary kiln.
  • the coarse grain can be separated before the separation into the finer and coarser fraction or after the separation from the coarser fraction.
  • coarse coal particles are not blown in with the coarser fraction, as a result of which the excess carbon content of the discharge material is reduced and the operating conditions in the furnace can be made more uniform. This separation is carried out in particular when the reducing agent contains larger and changing proportions of coarse grain.
  • a preferred embodiment is that the upper grain size of the blown coarser fraction is limited to 10 to 15 mm. This limitation gives very good operating conditions in the rotary kiln.
  • a preferred embodiment consists in that after the separation, the finer fraction is passed into one container and the coarser fraction into another container, the corresponding amounts of finer and coarser fraction are drawn off from the containers, mixed and blown into the discharge end, the excess Drain the quantities of the finer and coarser fraction separately from the containers and into the end of the entry Rotary kiln can be charged.
  • the term "container” means chutes, bunkers and the like. Dispensing devices are arranged at the lower end of the containers, which allow metered removal and control the desired amount of finer and coarser fractions from the respective containers. The excess amount of finer and coarser fraction flows out of the upper part of the container and is charged into the entry end of the furnace.
  • the streams of the fractions are passed into bunkers and then metered out.
  • the desired mixture of coarser and finer fractions for blowing in can be achieved with very little effort, regardless of fluctuations in the grain composition of the coal supplied.
  • the rotary kiln had a diameter of 4.8 m and a length of 80 m. It was equipped with 8 jacket pipes and 3 systems of nozzle stones. Air was blown into the free furnace space through the casing pipes and nozzle stones and also into the feed through the nozzle stones. A coal blowing device and a central burner were arranged at the discharge end of the furnace.
  • 1.2 t / h were in a grain size of 0 - 5 mm and 3.8 t / h in a grain size of 5 - 15 mm.
  • the temperature of the furnace atmosphere in the last part of the rotary kiln could be kept constant at around 1090 ° C.
  • the advantages of the invention are that very constant furnace conditions can be maintained in the end zone of the rotary kiln before the discharge end.
  • a precisely metered and constant ratio of coarser to finer fraction can be set and maintained even with the usually constantly fluctuating fine fractions of the coal supplied.
  • the temperature and, on the other hand, the carbon content in the feed are kept largely constant and, if necessary, can be changed quickly and in a controlled manner.
  • the ratio can be set and kept constant so that - in connection with the use of only one blowing device - by the rapid combustion of the fine-grained coal in flight a constant temperature and a rapid and constant consumption of the oxygen of the carrier air is achieved and thereby the combustion of the coarser coal is kept low during the flight. This also brings a constant amount of carbon into the loading bed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Manufacture Of Iron (AREA)
EP87201059A 1986-06-21 1987-06-05 Verfahren zur Direktreduktion von eisenoxidhaltigen Materialien im Drehrohrofen Expired - Lifetime EP0255154B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863620842 DE3620842A1 (de) 1986-06-21 1986-06-21 Verfahren zur direktreduktion von eisenoxidhaltigen materialien im drehrohrofen
DE3620842 1986-06-21

Publications (2)

Publication Number Publication Date
EP0255154A1 EP0255154A1 (de) 1988-02-03
EP0255154B1 true EP0255154B1 (de) 1991-04-17

Family

ID=6303424

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87201059A Expired - Lifetime EP0255154B1 (de) 1986-06-21 1987-06-05 Verfahren zur Direktreduktion von eisenoxidhaltigen Materialien im Drehrohrofen

Country Status (11)

Country Link
US (1) US4838934A (enrdf_load_stackoverflow)
EP (1) EP0255154B1 (enrdf_load_stackoverflow)
CN (1) CN1011893B (enrdf_load_stackoverflow)
AU (1) AU590862B2 (enrdf_load_stackoverflow)
DE (2) DE3620842A1 (enrdf_load_stackoverflow)
ES (1) ES2021694B3 (enrdf_load_stackoverflow)
GR (1) GR3001794T3 (enrdf_load_stackoverflow)
ID (1) ID929B (enrdf_load_stackoverflow)
IN (1) IN164140B (enrdf_load_stackoverflow)
TR (1) TR23022A (enrdf_load_stackoverflow)
ZA (1) ZA874437B (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7618655B2 (en) 2003-11-21 2009-11-17 Cytotools Gmbh Method for the preparation of aqueous solutions of reactive chlorine compounds
AT514438B1 (de) 2013-07-04 2015-01-15 Zizala Lichtsysteme Gmbh Fahrzeugscheinwerfer
CN103757168B (zh) * 2013-12-31 2015-10-07 李苏翔 一种炼铁回转窑及其炼铁工艺

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US981280A (en) 1910-05-12 1911-01-10 John T Jones Method of reducing iron ore.
US2709650A (en) * 1950-05-22 1955-05-31 Johannsen Friedrich Method of processing iron containing materials to nodules
US3097090A (en) * 1960-06-23 1963-07-09 Independence Foundation Metallurgical process
US3890138A (en) * 1971-10-19 1975-06-17 Western Titanium N L Reduction of iron-containing ores
US4375883A (en) * 1980-03-24 1983-03-08 The Direct Reduction Corporation System for recycling char in iron oxide reducing kilns
AU540463B2 (en) * 1981-04-22 1984-11-22 Tata Iron + Steel Co..Ltd. The Production of sponge iron + a rotary kiln for producing the same
US4378244A (en) * 1981-11-03 1983-03-29 The Direct Reduction Corporation System for coal injection in iron oxide reducing kilns
DE3332556A1 (de) * 1983-09-09 1985-03-28 Fried. Krupp Gmbh, 4300 Essen Verfahren zur reduktion oxidischer eisenerze im drehrohrofen

Also Published As

Publication number Publication date
TR23022A (tr) 1989-01-24
EP0255154A1 (de) 1988-02-03
CN87104326A (zh) 1988-01-20
GR3001794T3 (en) 1992-11-23
DE3769394D1 (de) 1991-05-23
ZA874437B (en) 1989-02-22
US4838934A (en) 1989-06-13
AU7452287A (en) 1987-12-24
ES2021694B3 (es) 1991-11-16
IN164140B (enrdf_load_stackoverflow) 1989-01-21
CN1011893B (zh) 1991-03-06
AU590862B2 (en) 1989-11-16
DE3620842A1 (de) 1987-12-23
ID929B (id) 1996-09-16

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