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WO2002099350A1 - Procede de raccordement de deux rangees de sections d'un four annulaire et dispositif associe au procede - Google Patents

Procede de raccordement de deux rangees de sections d'un four annulaire et dispositif associe au procede Download PDF

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Publication number
WO2002099350A1
WO2002099350A1 PCT/NO2002/000200 NO0200200W WO02099350A1 WO 2002099350 A1 WO2002099350 A1 WO 2002099350A1 NO 0200200 W NO0200200 W NO 0200200W WO 02099350 A1 WO02099350 A1 WO 02099350A1
Authority
WO
WIPO (PCT)
Prior art keywords
firing
connecting duct
flow
gas passages
section
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.)
Ceased
Application number
PCT/NO2002/000200
Other languages
English (en)
Inventor
Anders Ruud
Inge Holden
Nigel Martin Anderson
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.)
Norsk Hydro ASA
Original Assignee
Norsk Hydro ASA
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 Norsk Hydro ASA filed Critical Norsk Hydro ASA
Publication of WO2002099350A1 publication Critical patent/WO2002099350A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B13/00—Furnaces with both stationary charge and progression of heating, e.g. of ring type or of the type in which a segmental kiln moves over a stationary charge
    • F27B13/06—Details, accessories or equipment specially adapted for furnaces of this type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B13/00—Furnaces with both stationary charge and progression of heating, e.g. of ring type or of the type in which a segmental kiln moves over a stationary charge
    • F27B13/02—Furnaces with both stationary charge and progression of heating, e.g. of ring type or of the type in which a segmental kiln moves over a stationary charge of multiple-chamber type with permanent partitions; Combinations of furnaces

Definitions

  • the present invention concerns a method for connecting firing gas passages in the outermost section in one row in a ring furnace for calcining of carbon bodies to firing gas passages in the matching outermost section in the parallel row via a connecting duct. Moreover, the present invention concerns a device in connection with such a method, whereby a flow director is installed inside the connecting duct, which will contribute to reducing the active flow cross-section and which is also designed to minimise problems with uneven gas distribution in the first sections in the furnace rows.
  • a ring furnace In a ring furnace, two rows of sections are usually built next to each other in parallel rows. At each end of a row of sections, the gas ducts are connected to the parallel row of sections via a connecting duct. In this way, the sections are joined together to form a ring.
  • Such furnaces have a firing cycle which is gradually moved in relation to the sections as the carbon material is calcined.
  • the firing gases from a section are conducted to an adjacent section in the direction of firing via passages arranged in head walls located between the sections.
  • Each section may be divided into several smaller pits or cassettes by means of partition walls or so-called cassette walls. These walls are provided with ducts for the firing gases, and heat is supplied to the carbon material to be calcined by conducting firing gases through these ducts.
  • a section may be divided into two parts by a barrier wall in the space below the cassettes.
  • the firing gases are then conducted up through one half and down through the other half in the ducts of the cassette walls in the direction of firing.
  • One aim of the present invention was to arrive at a method and device for connecting firing gas passages in the outermost section in one row to firing gas passages in the outermost section in the parallel row in such a way that the problems associated with uneven gas distribution and thus undesired temperature variations are minimised.
  • a connecting duct which is designed in such a way that the firing gases are distributed as evenly as possible between the gas passages in the head walls. This may be achieved by placing a flow director inside the connecting duct.
  • the flow director may consist of elements as stated in the applicant's own Norwegian patent application no. NO 20012044.
  • a gradual reduction in the active flow cross-section of the connecting duct will lead to a considerably improved flow pattern into the first section. This will, among other things, contribute to the achievement of a more even temperature distribution in the sections, which, in turn, results in a more even calcining level (lower standard deviation) of the carbon bodies overall in the section. The effects of this are increased production and/or a reduction in the quantity of energy (oil or gas) which must be supplied to the process.
  • Fig. 1 shows a plan view of the end of a ring furnace with two rows of sections connected to a connecting duct, where the section is taken just above the base of the sections.
  • FIG. 2 shows, in perspective from below, a part of a connecting duct with a flow director and an adjacent head wall with firing gas passages.
  • Figure 1 shows a plan view of the end of a ring furnace with two rows of sections. The section is taken at the lower end of the head wall and just above the base of the sections. The sections are connected to a connecting duct 1.
  • a flow director 2 is placed in the end of the connecting duct 1 , and the firing gases FG flow towards it.
  • the firing gases FG flow from the space below the partially shown section K3 through the firing gas passages 3, 3' in the head wall 4.
  • only two of the firing gas passages are marked with reference numbers, but there are firing gas passages along the entire head wall.
  • Section K2 may be connected to an extraction device (not shown) which contributes to the creation of a vacuum in section K2, which makes it possible for the firing gases to flow in this direction.
  • sections K3 and K2 are shown here, which may correspond to two of the serially connected sections in a combustion cycle as described in the applicant's own patent, US 5,759,027. The present invention will also apply successively to the other sections in the combustion cycle as the combustion process is moved forwards in the furnace, even though this is not shown in the figure.
  • Figure 2 shows, in perspective from below, a part of a connecting duct 1 which is designed with an arch, in which a flow director 2 forms an inclined wall by the firing gas passages 6, 6' in the head wall 7 above the base of the furnace 5.
  • the firing gases FG flow from the firing gas passages 3, 3' in the head wall 4 in the outermost section in one row (not shown), through the connecting duct 1 and in through the firing gas passages 6, 6' in the head wall 7.
  • the flow director 2 may be fixed in the connecting duct 1 at each end in such a way that at least one end fixing allows expansion/contraction of the flow director 2.
  • the flow director 2 will contribute to making the flow conditions between the outermost sections, here shown as sections K3 and K2, as like the flow conditions between adjacent sections in a row as possible.
  • the length and angle of the flow director are, therefore, adapted to the specific furnace. If the firing direction is changed, the flow director 2 may be moved to the other end of the connecting duct 1 (not shown in the figure).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)

Abstract

L'invention porte sur un procédé et sur un dispositif relatifs au raccordement des passages de gaz de combustion dans un section extrême de l'une des rangées d'un four annulaire de calcination de corps carbonés avec les passages de gaz de combustion de la section extrême correspondante de la rangée parallèle par l'intermédiaire d'un conduit de raccordement (1). La section transversale active dudit conduit (1) se réduit progressivement dans le sens du courant de gaz du fait de l'installation dans le conduit (1) d'un étrangleur (2). Cela permet une répartition aussi régulière que possible des gaz de combustion entre les passages d'alimentation (6, 6') de la paroi de tête (7), et une diminution des problèmes liés à la répartition irrégulière des gaz dans la première section des rangées du four.
PCT/NO2002/000200 2001-06-06 2002-06-05 Procede de raccordement de deux rangees de sections d'un four annulaire et dispositif associe au procede Ceased WO2002099350A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20012773 2001-06-06
NO20012773A NO314104B1 (no) 2001-06-06 2001-06-06 Fremgangsmåte for å forbinde to rekker kamre i en ringkammerovn samt anordning ved samme

Publications (1)

Publication Number Publication Date
WO2002099350A1 true WO2002099350A1 (fr) 2002-12-12

Family

ID=19912533

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2002/000200 Ceased WO2002099350A1 (fr) 2001-06-06 2002-06-05 Procede de raccordement de deux rangees de sections d'un four annulaire et dispositif associe au procede

Country Status (2)

Country Link
NO (1) NO314104B1 (fr)
WO (1) WO2002099350A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013187959A1 (fr) 2012-06-15 2013-12-19 Fluor Technologies Corporation Four de cuisson de carbone à feu mobile à récupération de chaleur
WO2013187960A1 (fr) 2012-06-15 2013-12-19 Fluor Technologies Corporation Système d'allumage à récupération de chaleur et de préchauffage d'oxygène pour cuisson de carbone

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4215982A (en) * 1976-05-05 1980-08-05 Elettrocarbonium S.P.A. Continuous ring furnaces for baking and rebaking carbon articles
US4269592A (en) * 1980-02-08 1981-05-26 Benton Charles M Control of combustibility of volatile hydrocarbons and particulate matter in an exhaust gas stream by use of a high velocity burner in a carbon bake ring furnace
EP0726438A2 (fr) * 1995-02-10 1996-08-14 NORSK HYDRO a.s. Dispositif pour un four à feu tournant à chambres

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4215982A (en) * 1976-05-05 1980-08-05 Elettrocarbonium S.P.A. Continuous ring furnaces for baking and rebaking carbon articles
US4269592A (en) * 1980-02-08 1981-05-26 Benton Charles M Control of combustibility of volatile hydrocarbons and particulate matter in an exhaust gas stream by use of a high velocity burner in a carbon bake ring furnace
EP0726438A2 (fr) * 1995-02-10 1996-08-14 NORSK HYDRO a.s. Dispositif pour un four à feu tournant à chambres

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013187959A1 (fr) 2012-06-15 2013-12-19 Fluor Technologies Corporation Four de cuisson de carbone à feu mobile à récupération de chaleur
WO2013187960A1 (fr) 2012-06-15 2013-12-19 Fluor Technologies Corporation Système d'allumage à récupération de chaleur et de préchauffage d'oxygène pour cuisson de carbone

Also Published As

Publication number Publication date
NO314104B1 (no) 2003-01-27
NO20012773L (no) 2002-12-09
NO20012773D0 (no) 2001-06-06

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