EP0897093A1 - Abdeckblock für Öfen mit aufgehängten Dächern und Verfahren zu dessen Herstellung - Google Patents

Abdeckblock für Öfen mit aufgehängten Dächern und Verfahren zu dessen Herstellung Download PDF

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Publication number
EP0897093A1
EP0897093A1 EP98202097A EP98202097A EP0897093A1 EP 0897093 A1 EP0897093 A1 EP 0897093A1 EP 98202097 A EP98202097 A EP 98202097A EP 98202097 A EP98202097 A EP 98202097A EP 0897093 A1 EP0897093 A1 EP 0897093A1
Authority
EP
European Patent Office
Prior art keywords
layer
block
refractory
layers
insulating properties
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Withdrawn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
EP98202097A
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English (en)
French (fr)
Inventor
Ermanno Magni
Luigi Corona
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.)
Thermal Ceramics Italiana Srl
Original Assignee
Thermal Ceramics Italiana Srl
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 Thermal Ceramics Italiana Srl filed Critical Thermal Ceramics Italiana Srl
Publication of EP0897093A1 publication Critical patent/EP0897093A1/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Withdrawn legal-status Critical Current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
    • F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
    • F27D1/06—Composite bricks or blocks, e.g. panels, modules

Definitions

  • the invention relates to a covering block for furnaces of the suspended roof type and to a process for the construction of said block.
  • furnaces of the suspended roof type are well known and widely utilised in various fields of the industrial sector, in the place of conventional arches-furnaces, with regard to which they provide known functional advantages.
  • the covering wall is comprised of a plurality of refractory elements that are kept - through suitable metal means - in a suspended condition relatively to a supporting frame. Such elements are then approached to one another and adequately pressed against one another, so as to reduce the air spaces between adjoining elements, through which spaces the heat generated in the inside of the furnace may disperse towards the outside.
  • furnaces To be in condition of running in a thermodynamically efficient way, furnaces must be fabricated from materials suitable to withstand the high temperatures of the inside of the combustion chamber and to keep, in the inside of said combustion chamber, the heat generated by the flame supplied by the furnace burners.
  • the walls of the furnace are made from materials having a high level of refractory, possibly by carrying out special workings (for instance, application of special covering paints) on the surface that will face the inside of the combustion chamber.
  • the insulation level desired is usually achieved by increasing the thickness of the furnace walls, and by applying an external additional insulation.
  • the thickness of the individual blocks is limited by the need of ensuring, during the construction of the same, an adequate and homogeneous burning of the base material, the increase in thickness of the furnace wall is achieved by placing several vertical refractory elements near to one another.
  • the additional insulation consists of suitable material, provided on the wall of suspended blocks.
  • suitable materials used for this purpose are insulating concrete and ceramic fiber mats.
  • a suspended roof furnace obtained according to the above method has the drawback of a high installation cost, especially because of the high number of refractory elements (which are particularly expensive) that are necessary to obtain a wall having such a thickness as to ensure a good thermal insulation during the running.
  • the technical problem which is at the basis of this invention is that of contriving a covering block for suspended roof furnaces having adequate refractory and insulating properties and, at the same time, a contained cost, so as to reduce the amount of the investments that are to be provided for the construction of said furnace.
  • the invention relates therefore to a covering block for furnaces of the suspended type, characterised in that it comprises at least a first and a second superposed layers having different refractory and insulating properties.
  • the term "refractory” is intended to mean a material that can withstand, without remarkable structural alterations, the high temperatures of a furnace (at least 1000 ⁇ 1200 °C and more) and, possibly, the direct action of the flame; instead, the term “insulating” is intended to mean a material having a low thermal conductivity, and therefore a material that can provide a high resistance to the heat flow.
  • a covering block having good refractory properties and able to ensure at the same time a good thermal insulation.
  • Reduction in costs is achieved by reducing the overall percentage of refractory material (more expensive) in the block; by limiting the presence of such material in given layers suitably located in the inside of said block, and by providing further layers of insulating material: in this way it is possible to achieve the refractory and insulation levels desired.
  • Such reduction in the percentage of refractory material involves also a reduction in the weight of the resulting block, with remarkable advantages for the installers of the various blocks and the resulting wall.
  • the first and the second layer comprise respectively a first and a second brick independent as concerns construction. This allows to realise the covering block in a particularly simple manner.
  • the first layer has higher refractory properties with respect to the second layer. More advantageously, the second layer has higher insulating properties with respect to the first layer.
  • the refractory material expensive
  • the lower layer performs prevailingly a refractory activity towards the heat present in the inside of the furnace, without however markedly opposing the heat flow towards the outside.
  • Such flow will be opposed afterwards by the insulating material placed in the upper layers of the block.
  • the first and the second layer are mutually fixed by high fixing strength glues. In this way, it is possible to ensure the structural integrity of the block, indispensable both in terms of safety and in terms of thermal efficiency of the furnace.
  • the second layer comprises seats intended for housing means suitable to support the above block relatively to a supporting frame. Therefore, such seats are obtained in a relatively colder block portion, where the presence of insulating material is provided; this ensures during the running the structural integrity of the metal support means that are to be mounted in such seats.
  • the invention relates to a covering wall for furnaces of the suspended roof type, comprising a plurality of blocks of the above described type, such blocks being suspended on the assembly on a supporting frame and being approached to one another and kept in a condition of close adherence. Therefore, this wall is very efficient from the thermodynamic point of view and at the same time particularly simple from the point of view of construction.
  • the invention relates to a furnace of the suspended roof type, comprising a covering wall of the above described type.
  • the invention relates to a process for the construction of a covering block of the above described type, characterised in that it comprises the following steps:
  • the first and second layers are independent from one another as concerns construction, and the aforesaid fixing step comprises the step of placing between the first and the second layer a high fixing strength glue.
  • Block 1 comprises a plurality of superposed layers, indicated on the whole by 2.
  • the layers 2 comprise a plurality of superposed products, independent on one another from the point of view of construction and having an essentially parallelepiped form.
  • Such products are in practice refractory insulating bricks, manufactured according to tecniques known per se, so as to have the refractory and insulating properties as desired that will be shown in the following.
  • Layers 2 comprise a first lower layer 3, having high refractory properties, and at least a second layer 4 (two layers 4a and 4b in the example shown, superposed to one another) having high insulating properties, superposed to the first layer 3.
  • the first layer 3 has refractory properties higher with respect to the second layers 4a and 4b which, in their turn, have insulating properties higher with respect to the first layer 3.
  • the first layer 3 has a lower surface 3a which faces the inside of a furnace combustion chamber (not shown).
  • the second layer 4a is fixed on the first layer 3 through an in-between high fastening strength glue 5. In the same way, the second layers 4a and 4b are fixed to one another
  • the second layer 4b has, on its upper surface, seats 7 suitably shaped to house metal or ceramic means (not shown) suitable to keep block 1 suspended relatively to a supporting frame (not shown).
  • block 1 During the running, block 1 will be mounted suspended on the supporting frame by means of the aforesaid metal means. To block 1 a plurality of other blocks 1 are approached and kept in close adherence by suitable pressing means (not shown) provided in the opposite ends of the covering wall so realised.
  • suitable pressing means (not shown) provided in the opposite ends of the covering wall so realised.
  • the lower surface 3a of each block 1 forms in this way a refractory surface of the aforesaid covering wall.
  • additional insulating materials (not shown) may be provided, around the suspension means.
  • the furnace During the running, the furnace generates heat at a given running temperature thanks to the heat generated by the flame supplied by the burners of the same furnace.
  • Such running is ensured by the capability of the refractory lower surfaces of block 1 to withstand the high temperatures of the inside of the furnace.
  • This invention allows to achieve several advantages compared to the known technique, comprising following ones.
  • the presence of separate refractory and insulating layers allows to markedly reduce the costs of installation of the furnace roof.
  • the possibility of placing the refractory material (expensive) only where its presence is necessary (i.e. only in the lower layer of the block) and the insulating material (less expensive) in the remaining portion of the block allows to provide a covering wall which, thickness being the same, requires an amount of refractory material much lower than the known technique.
  • the specific weight of a good insulating material is about between a half and a third of the specific weight of a good refractory material.
  • the latter two are insulating materials superposed on refractory materials: the first is a mat of ceramic fibres, the second is an insulating concrete.
  • a covering wall model was constructed according to the invention, having the following dimensions:

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
EP98202097A 1997-07-31 1998-06-24 Abdeckblock für Öfen mit aufgehängten Dächern und Verfahren zu dessen Herstellung Withdrawn EP0897093A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT97MI001840A IT1294291B1 (it) 1997-07-31 1997-07-31 Blocco di copertura per forni del tipo a soffitto sospeso e procedimento per la realizzazione di tale blocco
ITMI971840 1997-07-31

Publications (1)

Publication Number Publication Date
EP0897093A1 true EP0897093A1 (de) 1999-02-17

Family

ID=11377689

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98202097A Withdrawn EP0897093A1 (de) 1997-07-31 1998-06-24 Abdeckblock für Öfen mit aufgehängten Dächern und Verfahren zu dessen Herstellung

Country Status (2)

Country Link
EP (1) EP0897093A1 (de)
IT (1) IT1294291B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108895841A (zh) * 2018-05-15 2018-11-27 新兴能源装备股份有限公司 一种耐磨扬料砖及其制造方法
CN111156822A (zh) * 2020-02-03 2020-05-15 西安博莱炉业科技股份有限公司 一种高温电阻炉炉顶结构及其安装方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1448684A (en) * 1921-04-08 1923-03-13 Norton Co Laminated superrefractory article
DE460763C (de) * 1925-01-27 1928-06-15 Spennemann & Lindemann G M B H Feuerraumdecke mit an Traegern aufgehaengten Steinen
US2908157A (en) * 1953-10-30 1959-10-13 Foster Wheeler Corp Composite firebrick
US3134199A (en) * 1960-05-19 1964-05-26 North American Refractories Complexed refractory brick
DE1558579A1 (de) * 1967-06-13 1970-04-09 Gottfried Lichtenberg Gmbh Feuerbestaendiges,waermeisolierendes Futter fuer die Zustellung von Industrieoefen
EP0534267A1 (de) * 1991-09-17 1993-03-31 EUROIMPIANTI S.r.l. Vorgefertigtes Modul zur Herstellung von Wänden für Öfen zum Brennen und Trocknen von Platten

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1448684A (en) * 1921-04-08 1923-03-13 Norton Co Laminated superrefractory article
DE460763C (de) * 1925-01-27 1928-06-15 Spennemann & Lindemann G M B H Feuerraumdecke mit an Traegern aufgehaengten Steinen
US2908157A (en) * 1953-10-30 1959-10-13 Foster Wheeler Corp Composite firebrick
US3134199A (en) * 1960-05-19 1964-05-26 North American Refractories Complexed refractory brick
DE1558579A1 (de) * 1967-06-13 1970-04-09 Gottfried Lichtenberg Gmbh Feuerbestaendiges,waermeisolierendes Futter fuer die Zustellung von Industrieoefen
EP0534267A1 (de) * 1991-09-17 1993-03-31 EUROIMPIANTI S.r.l. Vorgefertigtes Modul zur Herstellung von Wänden für Öfen zum Brennen und Trocknen von Platten

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108895841A (zh) * 2018-05-15 2018-11-27 新兴能源装备股份有限公司 一种耐磨扬料砖及其制造方法
CN108895841B (zh) * 2018-05-15 2019-11-15 新兴能源装备股份有限公司 一种耐磨扬料砖及其制造方法
CN111156822A (zh) * 2020-02-03 2020-05-15 西安博莱炉业科技股份有限公司 一种高温电阻炉炉顶结构及其安装方法

Also Published As

Publication number Publication date
IT1294291B1 (it) 1999-03-24
ITMI971840A1 (it) 1999-01-31

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