EP0566846A1 - Von Luft gestützte verbesserte alkalische Zelle - Google Patents

Von Luft gestützte verbesserte alkalische Zelle Download PDF

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Publication number
EP0566846A1
EP0566846A1 EP93103553A EP93103553A EP0566846A1 EP 0566846 A1 EP0566846 A1 EP 0566846A1 EP 93103553 A EP93103553 A EP 93103553A EP 93103553 A EP93103553 A EP 93103553A EP 0566846 A1 EP0566846 A1 EP 0566846A1
Authority
EP
European Patent Office
Prior art keywords
support structure
channel
structure according
vault
stones
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Withdrawn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
EP93103553A
Other languages
German (de)
English (en)
French (fr)
Inventor
Otto Karl
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.)
Veitscher Magnesitwerke AG
Original Assignee
Veitscher Magnesitwerke 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
Application filed by Veitscher Magnesitwerke AG filed Critical Veitscher Magnesitwerke AG
Publication of EP0566846A1 publication Critical patent/EP0566846A1/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/12—Casings; Linings; Walls; Roofs incorporating cooling arrangements
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/02—Crowns; Roofs
    • F27D1/025—Roofs supported around their periphery, e.g. arched roofs

Definitions

  • the invention relates to a vault-like support structure made of refractory molded parts for use in an industrial furnace, in particular a shaft furnace.
  • a vaulted support structure of the type mentioned above can be found there in the burner area.
  • the individual stones are, for example, conical in the radial direction.
  • the molded parts (stones) are not only exposed to considerable thermal stress. Dusty lime particles and combustion components also lead to a chemical attack in the area of the supporting structure. This chemical attack results primarily from the formation of melting phases of the solids mentioned in the contact area with the stones. Such melt phase-forming particles are, for example, alkalis, residues from combustion agents or flux. This leads to infiltration of the molten foreign substances into the stones of the supporting structure, which consist, for example, of magnesite qualities. At the same time, low-melting eutectics with the magnesitic components form. The result is an at least partial dissolution of the structure of the stones or an enlargement of the structure, so that the infiltration proceeds with increasing speed.
  • the invention seeks to remedy the situation and offer a vault-like support structure and an associated molded part which are more resistant to thermal and chemical attacks.
  • the invention is based on the finding that this goal can be achieved in a surprisingly simple manner if a temperature gradient is formed within the supporting structure, so that the supporting structure is cooler on the inside than on the outside.
  • the invention is based on the idea that in this way infiltration of molten phases on the way from Surfaces of the stones in the interior of the stones can be stopped via a corresponding temperature gradient.
  • the invention relates to a vault-like support structure made of refractory molded parts for use in an industrial furnace, in particular a shaft furnace, which is formed with at least one through channel extending from one end of the support structure to the other, which can be connected to an air supply device .
  • the through-channel formed within the supporting structure serves to carry "cooling air” in order to form a temperature gradient between the inside of the stone and the surface of the stones.
  • “Cooling air” initially means that the air passed through the through-channel is cooler than the temperature in the furnace.
  • the cooling air can consist of the combustion air fed into the shaft furnace, a small part of which is now passed through the through-channel.
  • the cooling air is supplied, for example, at one end of the through-channel and the cooling air is guided into the shaft at the opposite end, so that there is no overall energy loss; rather, the cooling device described works in an energy-neutral manner, since all of the combustion air remains in the shaft.
  • the shape of the through channel can be chosen freely. Typically, the through channel will have a circular cross-sectional area.
  • the through-channel should have a diameter of approximately 50 to 60 mm. This results in a cooling air volume between 50 and 100 m3 / h.
  • the pressure to be set at which the air is guided along the through-channel can be set empirically on each furnace; a pressure of 3000 mm water column can be given as an example.
  • the formation of the vault-like supporting structure in the manner described above leads to the fact that melting phases can continue to form in the surface area of the molded parts of the supporting structure, but are stopped on their way into the interior of the stone due to the lower temperatures prevailing there and consequently solidify. In this way, a kind of "diffusion barrier" is formed, which has the consequence that there is a clear inhibition of infiltration compared to the prior art and the durability of the supporting structure can be increased significantly.
  • the passageway will extend continuously from one end to the other end of the support structure. However, this is not absolutely necessary.
  • the through-channel can also have a wave shape, for example, although this appears less sensible due to the different stone geometries associated therewith for cost reasons.
  • Figure 1 shows the dome-shaped area around the distributor bridge of a ring shaft furnace for burning lime with a burner 10.
  • vault-like support structures 12 of the type according to the invention can be seen.
  • each stone 22, which here consist of magnesite each have a central opening 24, the openings 24 of the stones 22 being matched to one another such that a continuous, curved passage channel 26 extends over the arch , here with a circular cross-sectional area.
  • connection piece 28 is connected to the left end of the supporting structure in FIG. 2, via which cooling air (K) is led into the through-channel 26 (for example via a blower, not shown here), which exits again at the opposite end (at 30) and from there got into the shaft.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
EP93103553A 1992-04-22 1993-03-05 Von Luft gestützte verbesserte alkalische Zelle Withdrawn EP0566846A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4213183 1992-04-22
DE19924213183 DE4213183C1 (enrdf_load_stackoverflow) 1992-04-22 1992-04-22

Publications (1)

Publication Number Publication Date
EP0566846A1 true EP0566846A1 (de) 1993-10-27

Family

ID=6457213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93103553A Withdrawn EP0566846A1 (de) 1992-04-22 1993-03-05 Von Luft gestützte verbesserte alkalische Zelle

Country Status (3)

Country Link
EP (1) EP0566846A1 (enrdf_load_stackoverflow)
JP (1) JPH0650670A (enrdf_load_stackoverflow)
DE (1) DE4213183C1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1323980A1 (de) * 2001-12-31 2003-07-02 Von Roll Umwelttechnik AG Kühlbare Gewölbedecke
CN100346122C (zh) * 2004-08-30 2007-10-31 李建新 一种燃烧炉炉顶结构

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB409042A (en) * 1932-11-03 1934-04-26 Arthur William Ogilvy Webb Improvements in or relating to gas-heated furnaces
DE939526C (de) * 1949-12-03 1956-02-23 Hoerder Huettenunion Ag Luftgekuehlter, feuerfester Stein, insbesondere fuer Gewoelbe von Siemens-Martin-OEfen
FR1116086A (fr) * 1953-12-28 1956-05-03 Suedwestfalen Ag Stahlwerke Voûte de four refroidie par l'air
DE1433748A1 (de) * 1963-12-03 1969-09-25 Koho Es Gepipari Miniszterium Verfahren und Einrichtung zur Ausfuehrung der in OEfen durchgefuehrten ueblichen Aufgaben
GB2236778A (en) * 1989-10-10 1991-04-17 Radex Heraklith Keystone set

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB409042A (en) * 1932-11-03 1934-04-26 Arthur William Ogilvy Webb Improvements in or relating to gas-heated furnaces
DE939526C (de) * 1949-12-03 1956-02-23 Hoerder Huettenunion Ag Luftgekuehlter, feuerfester Stein, insbesondere fuer Gewoelbe von Siemens-Martin-OEfen
FR1116086A (fr) * 1953-12-28 1956-05-03 Suedwestfalen Ag Stahlwerke Voûte de four refroidie par l'air
DE1433748A1 (de) * 1963-12-03 1969-09-25 Koho Es Gepipari Miniszterium Verfahren und Einrichtung zur Ausfuehrung der in OEfen durchgefuehrten ueblichen Aufgaben
GB2236778A (en) * 1989-10-10 1991-04-17 Radex Heraklith Keystone set

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1323980A1 (de) * 2001-12-31 2003-07-02 Von Roll Umwelttechnik AG Kühlbare Gewölbedecke
US6655955B2 (en) 2001-12-31 2003-12-02 Von Roll Umwelttechnik Ag Coolable arched roof
CN100346122C (zh) * 2004-08-30 2007-10-31 李建新 一种燃烧炉炉顶结构

Also Published As

Publication number Publication date
JPH0650670A (ja) 1994-02-25
DE4213183C1 (enrdf_load_stackoverflow) 1993-01-14

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