EP1323980A1 - Voute à refroidissement - Google Patents

Voute à refroidissement Download PDF

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Publication number
EP1323980A1
EP1323980A1 EP02025451A EP02025451A EP1323980A1 EP 1323980 A1 EP1323980 A1 EP 1323980A1 EP 02025451 A EP02025451 A EP 02025451A EP 02025451 A EP02025451 A EP 02025451A EP 1323980 A1 EP1323980 A1 EP 1323980A1
Authority
EP
European Patent Office
Prior art keywords
layer
vaulted ceiling
ceiling according
cooling fluid
vaulted
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Withdrawn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
EP02025451A
Other languages
German (de)
English (en)
Inventor
Erwin Wachter
Klaus Zoss
Bruno Andreoli
Werner Seglias
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.)
Hitachi Zosen Innova AG
Original Assignee
Von Roll Umwelttechnik 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 Von Roll Umwelttechnik AG filed Critical Von Roll Umwelttechnik AG
Publication of EP1323980A1 publication Critical patent/EP1323980A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/08—Cooling thereof; Tube walls

Definitions

  • the invention relates to a coolable vaulted ceiling for a high temperature melting furnace according to the generic term of Claim 1.
  • Vaulted ceilings for high-temperature melting furnaces usually consist of one layer, usually several layers of heat-resistant (refractory) stones. These exist, for example made of silicon carbide, chamotte, high alumina and / or Chromium corundum. Especially with a self-supporting Vaulted ceilings must also cover the refractory stones permanent heat exposure to be dimensionally stable so that the vault holds. There is an additional load on the stones for systems that are not in continuous operation, e.g. Reduktionsschmelzöfen in waste incineration plants, due to heat-related Contraction and expansion of the stones. To one To prevent shortening the life of the refractory bricks is therefore compliance with those specified by the manufacturer maximum averaged over the entire shift medium temperature essential.
  • the vault is an additional problem with furnaces, where the inside of the furnace is tight on the outside and the inside got to.
  • reduction furnaces for example, none Oxygen from outside penetrate into the furnace not affect the reducing atmosphere inside the oven and to prevent that already reduced Metals are oxidized again.
  • reducing gas does not escape to the outside as it is on cooler, in particular metallic components condensed and accelerates their corrosion.
  • the tightness of the refractory layer is caused by wear of the refractory Stones due to high heat loads and heat fluctuations, which can lead to deformation of the masonry reduced.
  • a vaulted ceiling is known from DE 27 58 755, which to increase the life of the refractory bricks Owns water cooling.
  • the vaulted ceiling includes one Vaulted ring, on which there is a frame made of conduit pipes supports for a coolant.
  • On the line pipes are the refractory stones are loosely placed. By cooling the refractory bricks in front of a too large thermal Load protected. The tightness of the vault is however not given.
  • the line pipes are also direct exposed to the furnace atmosphere.
  • the invention is therefore based on the object Specify vaulted ceiling that is both permanent as well the inside of the oven against the entry or exit of gas seals.
  • the coolable vaulted ceiling according to the invention also comprises at least one layer of refractory bricks on the at least one of them facing away from the inside of the furnace Sealing layer, an insulation layer with heat insulation Effect, and a cooling layer used to conduct a Cooling fluid is formed.
  • the sealing layer serves to seal the inside of the furnace against leakage or entry of gas.
  • she consists preferably from a metal foil. is particularly suitable a steel foil, preferably through a glass fiber fabric is reinforced.
  • Such a sealing layer is in the Temperatures from 100 to 450 ° C, which on the The inside of the stone facing away from the furnace does not prevail flammable and fusible and also keeps overpressure in the Inside the oven stood.
  • the sealing layer can also be inside the refractory Layer, e.g. with a layer structure Refractory bricks and lightweight fire bricks or lightweight fire tiles between the lower layers formed from it, which can then also act as an insulation layer.
  • the sealing layer from the cooling layer is through the insulation layer separated.
  • the insulation layer serves to establish a predetermined temperature difference between Outside and inside or between the refractories Stones and the surrounding area.
  • the Sealing layer is kept in a temperature range that does not fall below a predetermined minimum temperature, will also condense aggressive gases the sealing layer prevents. Due to the cooling fluid in the Cooling layer is a predetermined amount of heat over the Vaulted ceiling removed.
  • the thickness and the material of the layers are preferred and / or the heat dissipation of the cooling fluid is selected in this way are that the mean temperature in the refractory Stones does not exceed a specified temperature value. This is preferably between 1300 and 1600 ° C and is in particular about 1450 ° C.
  • the Sealing layer is in a predetermined temperature range kept above the dew point of the inside of the oven contained aggressive gases. The minimum temperature is preferably 150-250 ° C, particularly preferably 200 ° C.
  • the insulation layer can preferably have a temperature difference from 100 to 300 ° C, preferably 200 ° C. It is still predominant on its surface a temperature of 100 to 200 ° C. This surface will from the cooling layer, preferably all over Contacted surface area.
  • the cooling layer includes preferably a cover layer and thus directly or Pipes connected indirectly via contact elements. The cooling layer dissipates a predetermined amount of heat.
  • the invention is particularly for furnaces with a self-supporting Vault suitable, since compliance with a predetermined average temperature of the refractory bricks is particularly important for reasons of stability.
  • the invention is also suitable for ovens where the Gas atmosphere inside the furnace must be checked in particular must, e.g. for reduction melting furnaces, in particular for those for treating slag from waste incineration.
  • Fig. 1 shows the layer structure of an inventive Vaulted ceiling.
  • the supporting vault is formed by a layer 1 of refractory bricks made up of four Sub-layers 1a-d exist.
  • a first Lower layer 1a made of refractory bricks 8 is a second one Lower layer 1b made of lightweight fire bricks 9. It exclude two further sublayers 1c, 1d Light fire plate 10, which is already heat-insulating Act.
  • 1d Light fire plate 10 which is already heat-insulating Act.
  • the furnace interior 11th seals gastight. Is on the sealing layer 2 the insulation layer 3, which is heat-insulating and causes the sealing layer 2 not below one certain minimum temperature cools.
  • the insulation layer 3 is followed by the cooling layer 4.
  • This comprises a cover layer 5, which here consists of two Foil layers 5a, 5b is formed.
  • the cover layer 5 is thermally conductive.
  • Line pipes 7 for the cooling fluid are connected with plate-shaped contact elements 6, the Heat transfer between the cover layer 5 and the Ensure pipe 7 or the cooling fluid.
  • the Shape of the contact elements 6 is based on the shape of the vault adjusted so that there is a large-area contact.
  • the conduits 7, which like the contact elements 6 consist of a metal with high thermal conductivity preferably welded to the contact elements 6.
  • Contact element 6 and pipe 7 can also be in one piece be made. Water is preferably used as the cooling fluid used. The use of air is also possible however, has the disadvantage of lower heat capacity.
  • the first sub-layer 1a has a thickness of 200 to 400 mm, preferably about 300 mm.
  • the refractory bricks 8 consist, for example, of approximately 60% Al 2 O 3 , 3% SiO 2 , 0.3% Fe 2 O 3 and 30% Cr 2 O 3 .
  • the thermal conductivity is preferably between 1 and 5 W / mK and is, for example, approximately 3 W / mK (at 700 ° C) or 2.8 W / mK (at 1000 ° C).
  • the first lower layer has, for example, an average temperature of 1400 to 1500 ° C. at temperatures inside the furnace 11.
  • the second sub-layer 1b has, for example, a thickness of 40 to 90 mm, preferably 65 mm.
  • the light fire bricks 9 consist, for example, of approximately 68% Al 2 O 3 , 30% SiO 2 , 0.4% Fe 2 O 3 and 0.4% CaO.
  • the thermal conductivity is preferably between 0.2 and 1.0 W / mK. For example, it is about 0.32 W / mK (at 400 ° C) and 0.41 W / mK (at 1200 ° C).
  • the second sub-layer 1b thus already has a reduced thermal conductivity. Their average temperature is around 950 to 1050 ° C.
  • the third and fourth sub-layers 1c, 1d each have a thickness of 20 to 60 mm, preferably 40 mm, for example.
  • the light fire plates 10 consist, for example, of about 43% Al 2 O 3 , 51% SiO 2 , 1.3% Fe 2 O 3 and 0.3% CaO.
  • the thermal conductivity is between about 0.29 W / mK (at 400 ° C) and 0.37 W / mK (at 1000 ° C), ie this underlayer has a further reduced thermal conductivity. In general, the thermal conductivity is preferably between 0.2 and 1.0 W / mK.
  • the average temperature of the third sub-layer is approximately 600 to 700 ° C, that of the fourth sub-layer approximately 250 to 450 ° C.
  • the sealing layer 2 consists of a steel foil with a Thickness between 50 and 300 microns, preferably 250 microns.
  • the Steel foil is through a 0.5 to 1 mm thick Reinforced fiberglass.
  • At a temperature inside the oven of 1500 to 1700 ° C is the temperature at the top lower layer 1d or on the sealing layer 2 preferably 100 to 300 ° C.
  • the insulation layer 3 with a thickness of 50 to 200 mm, preferably about 100 mm, comprises an insulation material which a heat difference of approx. 200 ° C between the Maintain sealing layer and the cooling layer 4 is able.
  • the thermal conductivity of the insulation layer is preferably between 0.05 and 0.2 W / mK.
  • the Material is, for example, insulating fabric or felt the base of rock wool.
  • the covering layer 5 each 50 to 300 microns, preferably 50 microns thick Aluminum foil used, which is also glass fiber reinforced can be.
  • the temperature of the cover layer 5 is between 20 and 200 ° C.
  • the line pipes 7 are to be arranged and dimensioned, and the cooling fluid and its flow rate are to be selected such that a heat flow of approximately 3000 W / m 2 is dissipated.
  • FIG. 2 shows a section through an inventive Vaulted ceiling for a reduction melting furnace.
  • the difference 1 is next to layer 1 made of refractory Stones do not have a separate insulation layer.
  • the Insulation layer 3 is rather the top sub-layer 1d realized from light fire plate 10. This already have a heat insulation, as described above Function.
  • the sealing layer 2 is therefore between the third and the top sublayer 1c, 1d.
  • the cooling layer 4 is located directly on the Insulation layer 3 (top lower layer 1d).
  • the vaulted ceiling is self-supporting and is supported laterally on the side walls 14 of the vault.
  • An outer construction 15 is used to hold a melting electrode 12. This is from above through an opening 13 in the Vaulted ceiling led into the furnace interior 11 and stands with of the melt not shown here in contact.
  • the opening 13 is closed gas-tight in a manner not shown here. For example, a water cup comes into question, which also acts as a pressure relief valve.
  • Fig. 3 shows a top view of the vaulted ceiling or Cooling layer 4.
  • the cooling layer 4 comprises line pipes 7, which exist as a plurality of separate pipe loops 16. Each pipe loop 16 is connected to a coolant supply line as well as a coolant drain connected. This ensures effective heat dissipation reached, with the heating of the coolant within each pipe loop 16 is kept low.
  • the Line pipes are with contact elements 6 in the form of Plates connected on the insulation layer 3 rest.
  • the openings 13 for the electrodes 12 are spared.
  • Insulation layer can be arranged on the cooling layer 4 his.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Processing Of Solid Wastes (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
EP02025451A 2001-12-31 2002-11-15 Voute à refroidissement Withdrawn EP1323980A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH23842001 2001-12-31
CH23842001 2001-12-31

Publications (1)

Publication Number Publication Date
EP1323980A1 true EP1323980A1 (fr) 2003-07-02

Family

ID=4568917

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02025451A Withdrawn EP1323980A1 (fr) 2001-12-31 2002-11-15 Voute à refroidissement

Country Status (4)

Country Link
US (1) US6655955B2 (fr)
EP (1) EP1323980A1 (fr)
JP (1) JP4370454B2 (fr)
NO (1) NO20025850L (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6893293B2 (en) * 2002-08-02 2005-05-17 Finisar Corporation Angled EMI shield for transceiver-PCB interface
US8428096B2 (en) * 2007-05-01 2013-04-23 Merkle International, Inc. Removable filler module
US20090151609A1 (en) * 2007-12-15 2009-06-18 Hoskinson Gordon H Incinerator with pivoting grating system
JP5659462B2 (ja) * 2009-05-14 2015-01-28 Ｊｆｅスチール株式会社 製鉄用容器の耐火物ライニング構造
US8693518B2 (en) * 2009-09-09 2014-04-08 Merkle International Inc. High temperature industrial furnace roof system
EP2857363B1 (fr) * 2012-05-30 2020-09-09 AGC Ceramics Co., Ltd. Structure en couronne
CN103836959A (zh) * 2012-11-26 2014-06-04 江苏华东炉业有限公司 炉顶加固装置
CN105742252B (zh) * 2014-12-09 2019-05-07 台达电子工业股份有限公司 一种功率模块及其制造方法
CN109694177A (zh) * 2018-06-21 2019-04-30 巨石集团有限公司 一种玻璃纤维池窑通路碹顶结构
CN113646274B (zh) * 2019-03-29 2023-04-18 旭硝子陶瓷株式会社 大拱顶棚构造及其制造方法
KR20230090630A (ko) * 2021-12-15 2023-06-22 재단법인 포항산업과학연구원 열손실 저감 및 부식 저감 효과가 우수한 로 벽체

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2368265A (en) * 1940-07-27 1945-01-30 Babcock & Wilcox Co Furnace wall
US2889698A (en) * 1951-07-28 1959-06-09 Babcock & Wilcox Co Insulated furnace wall
US3092051A (en) * 1960-05-27 1963-06-04 Sharon Steel Corp Basic open hearth roof construction
US4157815A (en) * 1978-04-28 1979-06-12 Inland Steel Company Furnace bottom construction with seal
US5163831A (en) * 1989-09-20 1992-11-17 Frazier-Simplex, Inc. Refractory tile for a suspended furnace wall
EP0566846A1 (fr) * 1992-04-22 1993-10-27 Veitscher Magnesitwerke-Actien-Gesellschaft Cellule alcaline améliorée assistée par l'air

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4021603A (en) * 1975-10-22 1977-05-03 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Roof for arc furnace
GB1571365A (en) * 1978-04-11 1980-07-16 Smidth & Co As F L Planetary cooler suspension
US5117604A (en) * 1989-06-26 1992-06-02 M.H. Detrick Co. Refractory brick wall system
US5011402A (en) * 1989-09-20 1991-04-30 Frazier Simplex, Inc. Suspended furnace wall
GB9922542D0 (en) * 1999-09-24 1999-11-24 Rhs Paneltech Ltd Metallurgical ladle/furnace roof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2368265A (en) * 1940-07-27 1945-01-30 Babcock & Wilcox Co Furnace wall
US2889698A (en) * 1951-07-28 1959-06-09 Babcock & Wilcox Co Insulated furnace wall
US3092051A (en) * 1960-05-27 1963-06-04 Sharon Steel Corp Basic open hearth roof construction
US4157815A (en) * 1978-04-28 1979-06-12 Inland Steel Company Furnace bottom construction with seal
US5163831A (en) * 1989-09-20 1992-11-17 Frazier-Simplex, Inc. Refractory tile for a suspended furnace wall
EP0566846A1 (fr) * 1992-04-22 1993-10-27 Veitscher Magnesitwerke-Actien-Gesellschaft Cellule alcaline améliorée assistée par l'air

Also Published As

Publication number Publication date
US6655955B2 (en) 2003-12-02
JP2003261335A (ja) 2003-09-16
NO20025850D0 (no) 2002-12-05
US20030175647A1 (en) 2003-09-18
NO20025850L (no) 2003-07-01
JP4370454B2 (ja) 2009-11-25

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