EP3069079B1 - Ofenwandanordnung - Google Patents

Ofenwandanordnung Download PDF

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Publication number
EP3069079B1
EP3069079B1 EP14796416.7A EP14796416A EP3069079B1 EP 3069079 B1 EP3069079 B1 EP 3069079B1 EP 14796416 A EP14796416 A EP 14796416A EP 3069079 B1 EP3069079 B1 EP 3069079B1
Authority
EP
European Patent Office
Prior art keywords
furnace wall
cooling fins
wall arrangement
furnace
arrangement
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.)
Active
Application number
EP14796416.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3069079A1 (de
Inventor
Rainer Weiss
Jürgen Schlax
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.)
Saint Gobain IndustrieKeramik Roedental GmbH
Original Assignee
Saint Gobain IndustrieKeramik Roedental GmbH
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.)
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Publication date
Application filed by Saint Gobain IndustrieKeramik Roedental GmbH filed Critical Saint Gobain IndustrieKeramik Roedental GmbH
Priority to PL14796416T priority Critical patent/PL3069079T3/pl
Publication of EP3069079A1 publication Critical patent/EP3069079A1/de
Application granted granted Critical
Publication of EP3069079B1 publication Critical patent/EP3069079B1/de
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    • 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
    • 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
    • F23M5/04—Supports for linings
    • 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
    • F23M5/06—Crowns or roofs for combustion chambers
    • 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 present invention relates to a furnace wall arrangement of an industrial furnace with a furnace wall and with at least one protective element made of refractory material which is fastened on one side to an inside of the furnace wall.
  • the furnace wall is designed, for example, as a closed boiler tube wall and, if appropriate, on the floor as a grate perforated by ventilation slots.
  • the boiler tube wall is formed, for example, from parallel tubes connected to one another via tube fins or individually standing tubes, partially fixed on the rear side.
  • a cooling fluid can usually flow through the tubes. Water is preferably used as the cooling fluid, the boiling temperature of which can be set to over 250 ° C. by a correspondingly high pressure.
  • the protective elements made of a refractory material are, for example, by mechanical holding devices, such as Hook, and / or connected to the furnace wall arrangement by mortar.
  • a furnace wall arrangement falling under the above-mentioned type is out DE 102 04 240 A1 known.
  • the boiler tube wall has holding elements and the protective elements have recesses in which the holding elements are provided.
  • Anchoring elements can be drilled through holes in the protective elements Holes of the holding elements are pushed in order to anchor the protective elements on the holding elements.
  • a better heat transfer between the protective element and the furnace wall is achieved by filling the space with mortar or by pouring the space with cement.
  • the space is filled with an adhesive that also serves to attach the protective elements to the furnace walls.
  • the disadvantage of this solution is a relatively high assembly and disassembly effort for repair work.
  • the cooling fins ensure good heat dissipation from the protective elements into the furnace wall. As a result, the protective elements are cooled from their rear sides, which has an advantageous effect on the service life of the protective elements.
  • the cooling fins are elongated profile rods which are at least partially positively and / or non-positively arranged in grooves matching the cooling fins and which are formed in the protective element.
  • the profile bars are long, rectangular, full profiles, in particular in the form of strips.
  • the profile bars do not have a filled cross section, but their cross section only occupies parts of a surface, for example a U-shaped profile occupies three edges of a surface.
  • the cooling fin is built up in layers from a graphite foil to the desired thickness. Strips of graphite foil with a thickness, in particular in the range from 0.4 to 1 mm, are stacked on top of one another and, if appropriate, glued to one another.
  • the rod-shaped configuration of the cooling fins is particularly advantageous if the furnace wall also has linear structures, for example pipes.
  • the cooling fins are preferably arranged parallel to the linearly running structures of the furnace wall, so that there are large contact surfaces between the furnace wall and the cooling fins, which in turn bring about good heat conduction from the cooling fins into the furnace wall.
  • the grooves in the protective elements ensure large contact areas between the protective elements and the cooling fins and thus good heat conduction from the protective elements into the cooling fins.
  • the cooling fins can advantageously be mechanically attached or glued into the grooves.
  • a flushing gas can be passed between adjacent linearly extending cooling fins, the cooling fins serving as channel walls of a flushing gas channel. No adjustments are usually required to the purge gas supply and purge gas discharge of the furnace.
  • the cooling fins have shapes other than elongated, for example circular.
  • the profile bars have an I-shaped cross section or a cross section in the form of a trapezoidal tapered "I" s, the wider side of the trapezoid being in contact with the Furnace wall and the narrower side of the trapezoid is provided in the groove of the protective element.
  • the cooling fins have particularly simple geometric shapes, which enable particularly simple production and processing of the cooling fins.
  • the cooling fins with the cross section in the form of a trapezoidally tapered "I” s that is to say slightly pointed cooling fins, partially facilitate complete insertion of the cooling fins into the grooves.
  • other profile rods are used, for example those whose cross-section is composed of a circular arc and straight ribs projecting radially from the circular arc, or of graphite foil built up in layers.
  • cooling fins are glued into the protective element.
  • the adhesive ensures good thermal contact, a gas-tight connection and, in addition, mechanical pre-assembly, which ultimately contributes to easy assembly and disassembly of the furnace wall arrangement.
  • cooling fins are attached to the furnace wall, for example glued, screwed, clamped or soldered.
  • the cooling fins consist of a heat-resistant elastic material. Due to the elasticity that is present even when there is a change in temperature, such cooling fins, when they are clamped between the furnace wall and the protective elements in the assembled state, remain permanently in a mechanical system on the furnace wall and on the protective element.
  • the cooling fin material is soft and, in the event of elastic deformation, exerts only small forces on the clamping components. From the cooling fins pressed onto the furnace wall, only permissible small compressive forces are exerted on the protective elements, so that the protective elements are not damaged.
  • the heat-resistant elastic sealing material is expanded graphite.
  • This material is characterized by good thermal conductivity, elasticity and good chemical resistance to corrosion by flue gas.
  • the specific thermal conductivity of the material used is preferably 100 W m -1 K -1 or greater. Consequently, this material is particularly well suited for the formation of the cooling fins.
  • Alternative materials, such as metal bellows or metal foams, are used in alternative designs.
  • the cooling fins are built up in layers from a graphite foil.
  • Graphite foil is flexible due to its small thickness.
  • Multi-layer arrangements of the graphite foil are processed in embodiments of the invention, for example as a lamellar stack or as a curl, in particular to form a flexible seal.
  • the furnace wall arrangement according to the invention is preferably dimensioned such that the temperatures of the cooling fins always remain below 600 ° C.
  • the inside of the protective elements face the combustion chamber, which has high temperatures of, for example, 1150 ° C. This heats up the inner surface of the protective elements.
  • temperatures up to greater than 1000 ° C. were measured on the surfaces of the inside of the protective elements.
  • the outside of the protective elements are cooled so that they have a lower surface temperature. Accordingly, the protective elements in the furnace wall arrangement according to the invention are well cooled overall, so that temperatures that occur are low and the durability of the protective elements is high.
  • the cooling fins are connected in a heat-conducting manner to the outer sides of the protective elements, so that these assume almost the same temperatures, at least in the vicinity of the interfaces with the protective elements. Excessively high temperatures can damage the cooling fins, for example oxygen can oxidize graphite at temperatures above 600 ° C. Accordingly, material thicknesses and other parameters that influence the temperatures that occur are set so that predetermined temperature limit values are not exceeded.
  • At least one graphite foil is arranged on the furnace wall, the graphite foil being clamped between adjacent cooling fins.
  • the good chemical resistance of graphite is used to cover areas of the furnace wall that are at risk of corrosion and to protect against chemical exposure to flue gas.
  • the furnace wall is designed as a boiler tube wall, in which parallel tubes are connected to one another via tube fins, or as a grate.
  • Side walls and ceilings of industrial furnaces are often designed as boiler tube walls.
  • the boiler tube walls are clad by plate-shaped protective elements, the sides of which are partially profiled inversely to the boiler tube walls to ensure constant distances between the furnace wall and the protective element.
  • the grate is therefore also to be understood as an oven wall, the component of an oven wall arrangement according to the invention, as well as the protective element as such.
  • the protective elements are preferably designed as waisted plates, that is to say as plates which are formed at two opposite ends with recesses, in particular those with a part-circular cross section, the recesses encompassing the pipes of the furnace wall at a distance.
  • the cooling fins are preferably received in the area of these recesses and pass through the gap-shaped annular space between the recess and the tube.
  • the plates are arranged one above the other and next to each other to form the furnace wall arrangement and are loosely guided so that fastening to the furnace wall can be omitted.
  • These plates preferably penetrate the space between adjacent pipes and protrude on both sides of the pipe plane.
  • the plates are made of the same material as described above, which also applies to the cooling fins.
  • the material of the cooling fins can be selected appropriately, but preferably graphite is used.
  • the advantage of the described embodiment is a very good protective function. Furthermore, the tubes are more or less completely surrounded by the cooling fins. Installation is also extremely simple and separate fasteners opposite the furnace wall are unnecessary.
  • Fig. 1 schematically shows a preferred embodiment of a furnace wall arrangement 1 according to the invention in cross section.
  • Components of the furnace wall arrangement 1 shown are a furnace wall 2, protective elements 3 and cooling fins 6 clamped between an inner side 4 of the furnace wall 2 and outer sides 5 of the protective elements 3.
  • the furnace wall 2 is a boiler tube wall which has tubes 12 and tube fins 13. During operation of the furnace, water is passed through the tubes 12, via which heat is removed from the furnace wall 2.
  • suspension recesses 11 are formed, by means of which the protective elements 3 are suspended on holding elements 10, the holding elements 10 being arranged, in particular fastened, on the furnace wall 3.
  • the protective elements 3 are plates made of silicon carbide.
  • the protective elements 3 are formed from other refractory materials.
  • Cooling fins 6 are clamped between the furnace wall 2 and the protective elements 3, which in the exemplary embodiment shown are preferably elastic rods or strips, in particular formed from expanded graphite, here, for example, and preferably rectangular rods with an I-shaped cross section. In the spatial dimension perpendicular to the plane shown, the cooling fins 6 and the grooves 7 have significantly larger linear lengths than the cross-sectional edges shown.
  • the cooling fins 6 lie suitably on the furnace wall 2 and on the wall elements, so that good heat conduction from the wall elements 3 via the cooling fins 6 into the furnace wall 2 is ensured.
  • Fig. 2 schematically shows a perspective view of the outside 5 of a wall element 3.
  • the edge of the wall element 3 shown at the front is a cut edge, on which the structure of the grooves 7 and the suspension recess 11 can be clearly seen.
  • strips with a trapezoidal cross-section are inserted into the grooves or joints 7, a width 10 mm measured between the parallel sides of the trapezoid, a length 8 mm measured on the wide side of the trapezoid and one on the narrow side of the trapezoid measured length is 7 mm, which is preferred, but is only exemplary.
  • the cooling fins preferably consist of the expanded graphite material "Ecophit L".
  • FIG 3 again shows purely schematically and in perspective part of a further embodiment of a furnace wall arrangement according to the invention.
  • the furnace wall is formed by spaced tubes 12 which, so to speak, span a boiler tube wall, cooling water being passed through the tubes during operation of the furnace in order to remove heat.
  • protective elements 3 instead of the protective elements 3 according to the embodiment in the Figures 1 and 2 protective elements in the form of waist stones 20 are now used which, unlike in the previous embodiment, are no longer attached directly to the furnace wall, but are loosely guided opposite or on the tubes 12.
  • These waist stones 20 are arranged above and next to one another to form the furnace wall arrangement, ie in the manner of a brick wall.
  • the protective elements 3 designed as waist stones are provided on two opposite sides, which face the tubes 12, with recesses 22, similar to the first exemplary embodiment, which here preferably have a semicircular cross section.
  • the corresponding cooling fins 6 are also accommodated in these recesses 22.
  • These cooling fins are in contact with the tube 12 and the waist stone and are also designed, in particular in terms of material designed according to the first embodiment, that is, preferably made of heat-resistant material, in particular expanded graphite with in particular elastic material properties.
  • the waist stones are plate-shaped and - as has already been explained above, according to the height of the furnace wall arrangement, a corresponding number of stones are stacked on top of one another and also next to one another, so that compared to the formation of the protective elements in the Figures 1 and 2 the protective elements also reach through the free space between the tubes 12 and, in addition, also protrude on both sides and, in conjunction with the waist stones 20 arranged next to one another, also substantially completely enclose the tube 12, so that the cooling fins 6 are arranged, so to speak, distributed over the entire circumference of the tubes 12 .
  • the waist stones 20 are formed in terms of material in accordance with the support elements 3 explained in connection with the first embodiment. The advantage of this embodiment is that the plates no longer have to be fastened on one side to the furnace wall, but rather are guided and arranged loosely along the tubes 12.
  • the waist panels have dimensions of 147 x 176 mm in length and width and a thickness of 100 mm.
  • the pipe spacing can be 150 mm with a pipe diameter of 57 mm.
  • the waist stones are preferably dimensioned with 223 x 187 x 64 mm.
  • Advantageous properties of graphite are a high thermal conductivity and a high chemical resistance to aggressive gases released in the furnace.
  • the heat resistance of graphite in air is sufficiently high for the application described, since the graphite is cooled by the tube wall.
  • the alignment of the cooling fins, which are in particular graphite strips, along the tubes of the tube wall and along the protective elements extending along the tubes ensures high heat transfer from the protective element into the furnace wall. This contributes to a significantly higher effectiveness of the furnace, compared to furnace with ventilated protective elements.
  • the surface temperature on the hot side of the protective element is lower than in the prior art.
  • the protective elements have an increased service life.
  • the adherence of fly ash and slag is less pronounced than in the prior art.

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  • 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)
EP14796416.7A 2013-11-12 2014-10-31 Ofenwandanordnung Active EP3069079B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14796416T PL3069079T3 (pl) 2013-11-12 2014-10-31 Układ ściany pieca

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013018936.5A DE102013018936B4 (de) 2013-11-12 2013-11-12 Ofenwandanordnung
PCT/EP2014/002930 WO2015070953A1 (de) 2013-11-12 2014-10-31 Ofenwandanordnung

Publications (2)

Publication Number Publication Date
EP3069079A1 EP3069079A1 (de) 2016-09-21
EP3069079B1 true EP3069079B1 (de) 2020-05-13

Family

ID=51893974

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14796416.7A Active EP3069079B1 (de) 2013-11-12 2014-10-31 Ofenwandanordnung

Country Status (4)

Country Link
EP (1) EP3069079B1 (pl)
DE (2) DE102013018936B4 (pl)
PL (1) PL3069079T3 (pl)
WO (1) WO2015070953A1 (pl)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3211307B1 (de) 2016-02-26 2019-06-05 Jünger + Gräter GmbH Feuerfestbau Feuerfestschutzsegment
DE102016103443B4 (de) 2016-02-26 2022-04-28 Jünger+Gräter GmbH Feuerfestschutzsegment
DE102016114177B4 (de) 2016-04-15 2023-11-23 Jünger+Gräter GmbH Feuerfestschutzsegment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1772486A (en) * 1925-06-17 1930-08-12 James C Hobbs Furnace wall
US2077410A (en) * 1932-02-20 1937-04-20 Babcock & Wilcox Co Furnace
US5107798A (en) * 1991-04-08 1992-04-28 Sage Of America Co. Composite studs, pulp mill recovery boiler including composite studs and method for protecting boiler tubes
US20120043065A1 (en) * 2009-05-06 2012-02-23 Luvata Espoo Oy Method for Producing a Cooling Element for Pyrometallurgical Reactor and the Cooling Element

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1841762A (en) 1932-01-19 gebmahy
GB338684A (en) 1929-10-18 1930-11-27 Fuller Lehigh Co Improvements in steam boiler furnaces
TWI226418B (en) 2001-11-08 2005-01-11 Mitsubishi Heavy Ind Ltd Fireproof structure and installation method for protecting water pipes
WO2003040617A1 (fr) * 2001-11-08 2003-05-15 Mitsubishi Heavy Industries, Ltd. Structure de fixation de brique refractaire pour protection de tube d'eau, et structure refractaire de protection de tube d'eau
DE10204240B4 (de) 2002-02-02 2004-07-01 Saint-Gobain Industriekeramik Düsseldorf Gmbh Platte für ein Schutzsystem für eine Kesselrohrwand sowie Schutzsystem für eine Kesselrohrwand
DE10303173B4 (de) 2003-01-27 2005-06-30 Saint-Gobain Industriekeramik Düsseldorf Gmbh Rohrwandschutz für eine Kesselrohrwand

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1772486A (en) * 1925-06-17 1930-08-12 James C Hobbs Furnace wall
US2077410A (en) * 1932-02-20 1937-04-20 Babcock & Wilcox Co Furnace
US5107798A (en) * 1991-04-08 1992-04-28 Sage Of America Co. Composite studs, pulp mill recovery boiler including composite studs and method for protecting boiler tubes
US20120043065A1 (en) * 2009-05-06 2012-02-23 Luvata Espoo Oy Method for Producing a Cooling Element for Pyrometallurgical Reactor and the Cooling Element

Also Published As

Publication number Publication date
DE102013018936B4 (de) 2022-01-13
EP3069079A1 (de) 2016-09-21
DE102013018936A1 (de) 2015-05-13
DE202014009337U1 (de) 2014-12-22
WO2015070953A1 (de) 2015-05-21
PL3069079T3 (pl) 2020-11-02

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