WO2009095244A1 - Lining of a furnace chamber - Google Patents

Lining of a furnace chamber Download PDF

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Publication number
WO2009095244A1
WO2009095244A1 PCT/EP2009/000583 EP2009000583W WO2009095244A1 WO 2009095244 A1 WO2009095244 A1 WO 2009095244A1 EP 2009000583 W EP2009000583 W EP 2009000583W WO 2009095244 A1 WO2009095244 A1 WO 2009095244A1
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WO
WIPO (PCT)
Prior art keywords
ceramic plates
lining according
grooves
tubes
lining
Prior art date
Application number
PCT/EP2009/000583
Other languages
German (de)
French (fr)
Inventor
Albrecht-Ehler Nowak
Original Assignee
Karrena Gmbh
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Filing date
Publication date
Application filed by Karrena Gmbh filed Critical Karrena Gmbh
Publication of WO2009095244A1 publication Critical patent/WO2009095244A1/en

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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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
    • C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/107—Protection of water tubes
    • F22B37/108—Protection of water tube 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
    • F23M5/08—Cooling thereof; Tube walls
    • 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
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/002—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using inserts or attachments
    • 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
    • F23M2900/00—Special features of, or arrangements for combustion chambers
    • F23M2900/05004—Special materials for walls or lining

Definitions

  • the invention relates to a lining of a Feuerungsraums with a pipe wall and on the pipe wall firing side mounted ceramic plates.
  • the object of the invention is to improve a lining of the type mentioned so that with a sufficiently high protection of the pipe wall, a small wall thickness of the ceramic plates can be achieved and thus optimum heat transfer is achieved.
  • the ceramic plates are made of low-pored material and form part-cylindrical grooves, in which the pipes of the pipe wall einhgen axis parallel.
  • These thin-walled ceramic plates re-shape the outside of the tube wall so that they form the corresponding outer-side waveform and thus one achieve optimum heat transfer.
  • Either the ceramic plates nestle in a form-fitting manner on the tube wall, or there is a gap between the ceramic plates and the tube wall, which is preferably filled in order to achieve optimum heat transfer.
  • By the tube wall outside following shaping of the plates is given a very uniform heat flow through the system, whereby only small temperature differences in the plate and thus only low thermal stresses arise.
  • the tubes engage positively in the grooves.
  • the tubes can be less than half their circumference in the gutters eino.
  • the ceramic plates consist of a silicon-impregnated silicon carbide. Not only does such a material result in optimal heat transfer, it also does not react with the dusts and slags, thus minimizing slag adhesion and buildup of ash streams.
  • the thickness (D1) of the ceramic plates (5) is substantially constant except for attachment and / or connection points.
  • the thickness of the ceramic plates is one to three times the thickness of the wall of the tubes.
  • the thickness of the ceramic plates can be 7 to 12 mm, in particular 8 to 10 mm.
  • the ceramic plates each form at least two mutually shaped, mutually parallel grooves.
  • the connection point between two grooves of a ceramic plate can form a longitudinal projection projecting toward the tube wall and parallel to the groove axis, which can be gripped around by at least one clamp fastened to the tube wall.
  • the clamp can be fastened to the webs fastened between the pipes.
  • a particularly advantageous embodiment of the ceramic plates is given if at the lower end of the ceramic plates a downwardly projecting, projecting into the hearth space extension is formed, through which the upper end of the underlying ceramic plates can be covered.
  • the extension may form a number of baffles parallel to the grooves.
  • Optimum heat transfer is achieved when the ceramic plates are secured to the tube wall by a thermally conductive mortar.
  • a thermally conductive mortar there may also be a ventilated intermediate space between the ceramic plates and the tube wall.
  • the gap can be filled with thermally conductive mortar.
  • Figure 1 is a horizontal section through the lining
  • Figure 2 is a perspective view of a ceramic plate
  • Figure 3 is a rear view of the ceramic plate
  • FIG. 4 shows the section according to B-B in FIG. 3;
  • FIG. 5 shows the section according to D-D in FIG. 3;
  • FIG. 6 shows a detail of Fig. 5
  • Figure 7 is a perspective view of the clip.
  • the lining of a firing chamber has a pipe wall 1 with a plurality of in particular vertically arranged, mutually parallel tubes 2, which are fastened to each other by webs 3, wherein the webs lie in the particular vertical center plane 4 of the pipe wall.
  • On the combustion chamber facing side of the tube wall 1 are attached to this ceramic plates 5, which form two part-cylindrical grooves 6 in the embodiment, each channel 6, a pipe 2 on the firing side covers.
  • the grooves 6 are coaxial with the respective tube 2, wherein the inner surface 7 of the grooves 6 either rests positively on the outside of the respective tube 2 or forms a gap 8 with the tube.
  • the tubes 2 with less than half of their circumference in the grooves 6 a.
  • the gap 8 is either kept free and preferably vented or filled by a thermally conductive mortar.
  • the ceramic plates 5 are fixed to the tube wall 1 by a heat-resistant adhesive.
  • each ceramic plate 5 forms in the embodiment, two parallel juxtaposed part-cylindrical grooves 6. Instead, but more than two grooves may be formed by a ceramic plate.
  • the ceramic plate forms a longitudinal web 5b, which can be covered by the longitudinal edge 5c of an adjacent ceramic plate, as shown in FIG.
  • the joint 5 d between two grooves 6 of a ceramic plate 5 is thus in the space between two tubes 2 and can in this case touch the web 3 or form with this the gap 8.
  • a projecting longitudinal projection 9 is formed on the inside of the ceramic plate 5, which is parallel to the axes of the grooves 6 and forms on both sides undercuts 10, which are engaged behind by a bracket 11.
  • the channel-shaped bracket 11 with U-shaped cross-section at the leg ends inwardly directed leg ends 12 which engage behind the undercuts 10.
  • the clip is, as shown in Fig. 1, fixed to the web 3 and by the trapezoidal cross-section of the longitudinal projection 9 when placing the ceramic plate 5 on the tube wall 1 adoptedbiegbar so that the leg ends on the oblique side surfaces of the longitudinal projection 9 slide along until the Clamp behind the longitudinal projection 9 snaps.
  • Clip 11 and longitudinal projection 9 thus form a positive, in particular releasable latching connection.
  • a single longitudinal projection 9 is integrally formed on the ceramic plate 5 at the back. Instead, however, two or more longitudinal projections 9 may be provided. This depends in particular on the length or height of the ceramic plate 5, which is 350 mm in the embodiment.
  • arcuate extension 13 is formed, wherein in a ceramic plate with two grooves, the extension 13 forms a double arc and each arc is coaxial with the gutter.
  • the ceramic plates 5 consist of an extremely low-porosity ceramic material, in particular of a silicon-impregnated silicon carbide.
  • the thickness D1 of the ceramic plates is one to three times the thickness D2 of the wall of the tubes 2.
  • the thickness D1 of the ceramic plates is 7 to 12 mm, in particular 8 to 10 mm, the thickness D1 being constant at least in the region of the channels 6.

Abstract

The invention relates to a lining of a furnace chamber comprising a tubular wall and ceramic plates attached to the tubular wall on the furnace side, wherein the ceramic plates comprise low-pore material and form partial-cylindrical grooves in which the tubes of the tubular wall lie axially parallel.

Description

Auskleidung eines Feuerungsraums Lining of a firebox
Die Erfindung betrifft eine Auskleidung eines Feuerungsraums mit einer Rohrwand und an der Rohrwand feuerungsseitig befestigten Keramikplatten.The invention relates to a lining of a Feuerungsraums with a pipe wall and on the pipe wall firing side mounted ceramic plates.
Bei diesen Auskleidungen ist es bekannt, Keramikplatten an der Rohrwand in der Weise zu befestigen, dass an der Rohrwand Laschen oder Bolzen vorstehen, die in eine Ausnehmung insbesondere einen Schlitz der Platte eingreifen. Hierzu ist es erforderlich, dass die Platten ausreichend dickwandig sind, um die Ausnehmungen bilden zu können. Ferner weist das Keramikmaterial der bekannten Keramikplatten eine erhebliche Porosität auf, so dass eine Mindestbrennstärke als Korrosionsschutz der metallischen Rohrwand erforderlich ist.In these liners, it is known to attach ceramic plates to the tube wall in such a way that projecting on the tube wall tabs or bolts which engage in a recess, in particular a slot of the plate. For this purpose, it is necessary that the plates are sufficiently thick-walled to form the recesses can. Furthermore, the ceramic material of the known ceramic plates has a considerable porosity, so that a minimum firing strength is required as corrosion protection of the metallic tube wall.
Aufgabe der Erfindung ist es, eine Auskleidung der eingangs genannten Art so zu verbessern, dass bei einem ausreichend hohen Schutz der Rohrwand eine geringe Wandstärke der Keramikplatten erreichbar ist und damit eine optimale Wärmeübertragung erzielt wird.The object of the invention is to improve a lining of the type mentioned so that with a sufficiently high protection of the pipe wall, a small wall thickness of the ceramic plates can be achieved and thus optimum heat transfer is achieved.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die Keramikplatten aus porenarmen Material bestehen und teilzylindrische Rinnen bilden, in denen die Rohre der Rohrwand achsparallel einhegen.This object is achieved in that the ceramic plates are made of low-pored material and form part-cylindrical grooves, in which the pipes of the pipe wall einhgen axis parallel.
Diese dünnwandigen Keramikplatten formen die Außenseite der Rohrwand nach, so dass sie die entsprechende Wellenform der Außenseite bilden und damit einen optimalen Wärmeübergang erzielen. Entweder schmiegen sich hierbei die Keramikplatten formschlüssig an der Rohrwand an, oder aber es besteht ein Zwischenraum zwischen den Keramikplatten und der Rohrwand, der vorzugsweise verfüllt ist, um eine optimale Wärmeübertragung zu erzielen. Durch die der Rohrwandaußenseite folgende Formgebung der Platten ist ein sehr gleichmäßiger Wärmestrom durch das System gegeben, wodurch nur geringe Temperaturdifferenzen in der Platte und dadurch nur geringe Wärmespannungen entstehen.These thin-walled ceramic plates re-shape the outside of the tube wall so that they form the corresponding outer-side waveform and thus one achieve optimum heat transfer. Either the ceramic plates nestle in a form-fitting manner on the tube wall, or there is a gap between the ceramic plates and the tube wall, which is preferably filled in order to achieve optimum heat transfer. By the tube wall outside following shaping of the plates is given a very uniform heat flow through the system, whereby only small temperature differences in the plate and thus only low thermal stresses arise.
Vorzugsweise wird hierbei vorgeschlagen, dass die Rohre in den Rinnen formschlüssig einliegen. Dabei können die Rohre mit weniger als der Hälfte ihres Umfangs in den Rinnen einliegen.Preferably, in this case, it is proposed that the tubes engage positively in the grooves. The tubes can be less than half their circumference in the gutters einliegen.
Besonders vorteilhaft ist es, wenn die Keramikplatten aus einem siliziumgetränkten Siliziumcarbid bestehen. Ein solches Material führt nicht nur zu einer optimalen Wärmeübertragung, sondern bildet auch mit den Stäuben und Schlacken keinerlei Reaktionen, so dass Schlackenhaftung und ein Aufbau von Aschewächten minimiert wird.It is particularly advantageous if the ceramic plates consist of a silicon-impregnated silicon carbide. Not only does such a material result in optimal heat transfer, it also does not react with the dusts and slags, thus minimizing slag adhesion and buildup of ash streams.
Eine optimale Wärmeübertragung, geringe Materialspannungen und Materialeinsparungen werden erreicht, wenn bis auf Befestigungs- und/oder Verbindungsstellen die Dicke (D1) der Keramikplatten (5) im Wesentlichen gleich bleibend ist. Hierbei wird vorzugsweise vorgeschlagen, dass die Dicke der Keramikplatten das ein- bis dreifache der Dicke der Wand der Rohre beträgt. Dabei kann die Dicke der Keramikplatten 7 bis 12 mm insbesondere 8 bis 10 mm betragen.Optimum heat transfer, low material stresses and material savings are achieved if the thickness (D1) of the ceramic plates (5) is substantially constant except for attachment and / or connection points. Here, it is preferably proposed that the thickness of the ceramic plates is one to three times the thickness of the wall of the tubes. In this case, the thickness of the ceramic plates can be 7 to 12 mm, in particular 8 to 10 mm.
Vorzugsweise wird vorgeschlagen, dass die Keramikplatten jeweils mindestens zwei aneinander geformte, zueinander parallele Rinnen bilden. Hierbei kann die Verbindungsstelle zwischen zwei Rinnen einer Keramikplatte einen zur Rohrwand vorkragenden, zur Rinnenachse parallelen Längsvorsprung bilden, der durch mindestens eine an der Rohrwand befestige Klammer umgreifbar ist. Hierbei kann die Klammer an den zwischen den Rohren befestigten Stegen befestigt sein. Eine besonders vorteilhafte Ausgestaltung der Keramikplatten ist dann gegeben, wenn am unteren Ende der Keramikplatten eine nach unten ragende, in den Feuerungsraum hineinragende Erweiterung angeformt ist, durch die das obere Ende der darunter befindlichen Keramikplatten überdeckbar ist. Hierbei kann die Erweiterung eine Anzahl von zu den Rinnen achsparallele Bögen bilden.Preferably, it is proposed that the ceramic plates each form at least two mutually shaped, mutually parallel grooves. In this case, the connection point between two grooves of a ceramic plate can form a longitudinal projection projecting toward the tube wall and parallel to the groove axis, which can be gripped around by at least one clamp fastened to the tube wall. In this case, the clamp can be fastened to the webs fastened between the pipes. A particularly advantageous embodiment of the ceramic plates is given if at the lower end of the ceramic plates a downwardly projecting, projecting into the hearth space extension is formed, through which the upper end of the underlying ceramic plates can be covered. In this case, the extension may form a number of baffles parallel to the grooves.
Eine optimale Wärmeübertragung wird erreicht, wenn die Keramikplatten durch einen wärmeleitenden Mörtel an der Rohrwand befestigt sind. Alternativ kann aber auch zwischen den Keramikplatten und der Rohrwand ein insbesondere belüfteter Zwischenraum bestehen. Hierbei kann der Zwischenraum mit wärmeleitendem Mörtel verfüllt sein.Optimum heat transfer is achieved when the ceramic plates are secured to the tube wall by a thermally conductive mortar. Alternatively, however, there may also be a ventilated intermediate space between the ceramic plates and the tube wall. Here, the gap can be filled with thermally conductive mortar.
Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird im Folgenden näher beschrieben. Es zeigenAn embodiment of the invention is illustrated in the drawings and will be described in more detail below. Show it
Figur 1 einen waagerechten Schnitt durch die Auskleidung;Figure 1 is a horizontal section through the lining;
Figur 2 eine perspektivische Ansicht einer Keramikplatte;Figure 2 is a perspective view of a ceramic plate;
Figur 3 eine Rückansicht der Keramikplatte;Figure 3 is a rear view of the ceramic plate;
Figur 4 den Schnitt nach B-B in Fig. 3;FIG. 4 shows the section according to B-B in FIG. 3;
Figur 5 den Schnitt nach D-D in Fig. 3;FIG. 5 shows the section according to D-D in FIG. 3;
Figur 6 einen Ausschnitt aus Fig. 5 und6 shows a detail of Fig. 5 and
Figur 7 eine perspektivische Ansicht der Klammer.Figure 7 is a perspective view of the clip.
Die Auskleidung eines Feuerungsraumes weist eine Rohrwand 1 auf mit einer Vielzahl von insbesondere senkrecht angeordneten, zueinander parallelen Rohren 2, die aneinander durch Stege 3 befestigt sind, wobei die Stege in der insbesondere senkrechten Mittelebene 4 der Rohrwand liegen. Auf der dem Feuerungsraum zugewandten Seite der Rohrwand 1 sind an dieser Keramikplatten 5 befestigt, die im Ausführungsbeispiel jeweils zwei teilzylindrische Rinnen 6 bilden, wobei jede Rinne 6 ein Rohr 2 feuerungsseitig überdeckt. Damit liegen die Rinnen 6 koaxial zu dem jeweiligen Rohr 2, wobei die Innenfläche 7 der Rinnen 6 entweder an der Außenseite des jeweiligen Rohrs 2 formschlüssig anliegt oder mit dem Rohr einen Zwischenraum 8 bildet. Hierbei liegen die Rohre 2 mit weniger als der Hälfte ihres Umfangs in den Rinnen 6 ein. Der Zwischenraum 8 ist entweder frei gehalten und vorzugsweise belüftet oder aber durch einen wärmeleitenden Mörtel ausgefüllt. Alternativ sind die Keramikplatten 5 durch einen hitzebeständigen Kleber an der Rohrwand 1 befestigt sein.The lining of a firing chamber has a pipe wall 1 with a plurality of in particular vertically arranged, mutually parallel tubes 2, which are fastened to each other by webs 3, wherein the webs lie in the particular vertical center plane 4 of the pipe wall. On the combustion chamber facing side of the tube wall 1 are attached to this ceramic plates 5, which form two part-cylindrical grooves 6 in the embodiment, each channel 6, a pipe 2 on the firing side covers. Thus, the grooves 6 are coaxial with the respective tube 2, wherein the inner surface 7 of the grooves 6 either rests positively on the outside of the respective tube 2 or forms a gap 8 with the tube. Here are the tubes 2 with less than half of their circumference in the grooves 6 a. The gap 8 is either kept free and preferably vented or filled by a thermally conductive mortar. Alternatively, the ceramic plates 5 are fixed to the tube wall 1 by a heat-resistant adhesive.
Somit bildet jede Keramikplatte 5 im Ausführungsbeispiel zwei parallel nebeneinander liegende teilzylindrische Rinnen 6. Stattdessen können aber auch mehr als zwei Rinnen von einer Keramikplatte gebildet sein. Auf einem seitlichen Längsrand 5a bildet die Keramikplatte einen Längssteg 5b, der von dem Längsrand 5c einer benachbarten Keramikplatte überdeckbar ist, wie dies in Fig. 1 dargestellt ist.Thus, each ceramic plate 5 forms in the embodiment, two parallel juxtaposed part-cylindrical grooves 6. Instead, but more than two grooves may be formed by a ceramic plate. On a lateral longitudinal edge 5a, the ceramic plate forms a longitudinal web 5b, which can be covered by the longitudinal edge 5c of an adjacent ceramic plate, as shown in FIG.
Die Verbindungsstelle 5d zwischen zwei Rinnen 6 einer Keramikplatte 5 liegt damit in dem Zwischenraum zwischen zwei Rohren 2 ein und kann hierbei den Steg 3 berühren oder mit diesem den Zwischenraum 8 bilden. An dieser Verbindungsstelle 5d ist auf der Innenseite der Keramikplatte 5 ein vorkragender Längsvorsprung 9 angeformt, der parallel zu den Achsen der Rinnen 6 liegt und beidseitig Hinterschneidungen 10 bildet, die von einer Klammer 11 hintergreifbar sind. Hierzu weist die rinnenförmige Klammer 11 mit U-förmigem Querschnitt an den Schenkelenden einwärts gerichtete Schenkelenden 12 auf, die die Hinterschneidungen 10 hintergreifen.The joint 5 d between two grooves 6 of a ceramic plate 5 is thus in the space between two tubes 2 and can in this case touch the web 3 or form with this the gap 8. At this connection point 5 d, a projecting longitudinal projection 9 is formed on the inside of the ceramic plate 5, which is parallel to the axes of the grooves 6 and forms on both sides undercuts 10, which are engaged behind by a bracket 11. For this purpose, the channel-shaped bracket 11 with U-shaped cross-section at the leg ends inwardly directed leg ends 12 which engage behind the undercuts 10.
Die Klammer ist, wie in Fig. 1 dargestellt, am Steg 3 befestigt und durch den trapezförmigen Querschnitt des Längsvorsprungs 9 beim Aufsetzen der Keramikplatte 5 auf die Rohrwand 1 auseinanderbiegbar, so dass die Schenkelenden an den schrägen Seitenflächen des Längsvorsprungs 9 entlang gleiten, bis die Klammer hinter den Längsvorsprung 9 einschnappt. Klammer 11 und Längsvorsprung 9 bilden damit eine formschlüssige insbesondere lösbare Rastverbindung.The clip is, as shown in Fig. 1, fixed to the web 3 and by the trapezoidal cross-section of the longitudinal projection 9 when placing the ceramic plate 5 on the tube wall 1 auseinanderbiegbar so that the leg ends on the oblique side surfaces of the longitudinal projection 9 slide along until the Clamp behind the longitudinal projection 9 snaps. Clip 11 and longitudinal projection 9 thus form a positive, in particular releasable latching connection.
Im Ausführungsbeispiel ist an der Rückseite nur ein einziger Längsvorsprung 9 an der Keramikplatte 5 angeformt. Stattdessen können aber auch zwei oder mehrere Längsvorsprünge 9 vorgesehen werden. Dies hängt insbesondere von der Länge bzw. Höhe der Keramikplatte 5 ab, die im Ausführungsbeispiel 350 mm beträgt. Am unteren Ende der Keramikplatte 5 ist eine nach unten ragende, in den Feuerungsraum etwas hineinragende bogenförmige Erweiterung 13 angeformt, wobei bei einer Keramikplatte mit zwei Rinnen die Erweiterung 13 einen Doppelbogen bildet und hierbei jeder Bogen koaxial zur Rinne liegt. Durch diese Erweiterung 13 ist das obere Ende einer darunter liegenden Keramikplatte überdeckbar.In the embodiment, only a single longitudinal projection 9 is integrally formed on the ceramic plate 5 at the back. Instead, however, two or more longitudinal projections 9 may be provided. This depends in particular on the length or height of the ceramic plate 5, which is 350 mm in the embodiment. At the lower end of the ceramic plate 5 is a downwardly projecting, in the firing space slightly protruding arcuate extension 13 is formed, wherein in a ceramic plate with two grooves, the extension 13 forms a double arc and each arc is coaxial with the gutter. By this extension 13, the upper end of an underlying ceramic plate can be covered.
Die Keramikplatten 5 bestehen aus einem äußerst porenarmen keramischen Material insbesondere aus einem siliziumgetränkten Siliziumcarbid. Die Dicke D1 der Keramikplatten beträgt das ein- bis dreifache der Dicke D2 der Wand der Rohre 2. Insbesondere beträgt die Dicke D1 der Keramikplatten 7 bis 12 mm insbesondere 8 bis 10 mm wobei zumindest im Bereich der Rinnen 6 die Dicke D1 gleich bleibend ist. The ceramic plates 5 consist of an extremely low-porosity ceramic material, in particular of a silicon-impregnated silicon carbide. The thickness D1 of the ceramic plates is one to three times the thickness D2 of the wall of the tubes 2. In particular, the thickness D1 of the ceramic plates is 7 to 12 mm, in particular 8 to 10 mm, the thickness D1 being constant at least in the region of the channels 6.

Claims

Ansprüche claims
1. Auskleidung eines Feuerungsraums mit einer Rohrwand (1) und an der Rohrwand feuerungsseitig befestigten Keramikplatten (5), dadurch gekennzeichnet, dass die Keramikplatten aus porenarmen Material bestehen und teilzylindrische Rinnen (6) bilden, in denen die Rohre (2) der Rohrwand (1) achsparallel einliegen.1. lining of a firing chamber with a tube wall (1) and on the tube wall on the firing side fixed ceramic plates (5), characterized in that the ceramic plates are made of low-pored material and form part-cylindrical grooves (6), in which the tubes (2) of the tube wall ( 1) einliegen axially parallel.
2. Auskleidung nach Anspruch 1 , dadurch gekennzeichnet, dass die Rohre (2) in den Rinnen (6) formschlüssig einliegen.2. Lining according to claim 1, characterized in that the tubes (2) einliegen positively in the grooves (6).
3. Auskleidung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Rohre (2) mit weniger als der Hälfte ihres Umfangs in den Rinnen (6) einliegen.3. Lining according to claim 1 or 2, characterized in that the tubes (2) with less than half of their circumference in the grooves (6) einliegen.
4. Auskleidung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Keramikplatten (5) aus einem siliziumgetränkten Siliziumcarbid bestehen.4. Lining according to one of the preceding claims, characterized in that the ceramic plates (5) consist of a silicon-impregnated silicon carbide.
5. Auskleidung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass bis auf Befestigungs- und/oder Verbindungsstellen die Dicke (D1) der Keramikplatten (5) im Wesentlichen gleich bleibend ist.5. Lining according to one of the preceding claims, characterized in that except for fixing and / or connection points, the thickness (D1) of the ceramic plates (5) is substantially constant.
6. Auskleidung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Dicke (D1) der Keramikplatten (5) das ein- bis dreifache der Dicke (D2) der Wand der Rohre (2) beträgt. 6. Lining according to one of the preceding claims, characterized in that the thickness (D1) of the ceramic plates (5) is one to three times the thickness (D2) of the wall of the tubes (2).
7. Auskleidung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Dicke (D1) der Keramikplatten (5) 7 bis 12 mm insbesondere 8 bis 10 mm beträgt.7. Lining according to one of the preceding claims, characterized in that the thickness (D1) of the ceramic plates (5) is 7 to 12 mm, in particular 8 to 10 mm.
8. Auskleidung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Keramikplatten (5) jeweils mindestens zwei aneinander geformte, zueinander parallele Rinnen (6) bilden.8. Lining according to one of the preceding claims, characterized in that the ceramic plates (5) each form at least two mutually shaped, mutually parallel grooves (6).
9. Auskleidung nach Anspruch 8, dadurch gekennzeichnet, dass die9. Lining according to claim 8, characterized in that the
Verbindungsstellen zwischen zwei Rinnen (6) einer Keramikplatte (5) einen zur Rohrwand (1) vorkragenden, zur Rinnenachse parallelen Längsvorsprung bildet, der durch mindestens eine an der Rohrwand befestigte Klammer (11) umgreifbar ist.Connecting points between two grooves (6) of a ceramic plate (5) to a pipe wall (1) projecting, parallel to the groove axis longitudinal projection forms, which is gripped by at least one clamp attached to the pipe wall (11).
10. Auskleidung nach Anspruch 9, dadurch gekennzeichnet, dass die Klammern (11) an den zwischen den Rohren befestigten Stegen (3) befestigt sind.10. Lining according to claim 9, characterized in that the brackets (11) are fastened to the webs (3) fastened between the tubes.
11. Auskleidung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass am unteren Ende der Keramikplatten (5) eine nach unten ragende, in den Feuerungsraum hineinragende Erweiterung (13) angeformt ist, durch die das obere Ende der darunter befindlichen Keramikplatten (5) überdeckbar ist.11. Lining according to one of the preceding claims, characterized in that at the lower end of the ceramic plates (5) has a downwardly projecting, projecting into the firing chamber extension (13) is formed, through which the upper end of the underlying ceramic plates (5) can be covered is.
12. Auskleidung nach Anspruch 11 , dadurch gekennzeichnet, dass die Erweiterung (13) zu den Rinnen achsparallele Bögen bildet.12. Lining according to claim 11, characterized in that the extension (13) forms axially parallel bends to the grooves.
13. Auskleidung nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Keramikplatten (5) durch einen wärmeleitenden Mörtel an der Rohrwand (1) befestigt sind.13. Lining according to one of the preceding claims, characterized in that the ceramic plates (5) by a thermally conductive mortar to the pipe wall (1) are attached.
14. Auskleidung nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass zwischen den Keramikplatten (5) und der Rohrwand (1) ein insbesondere belüfteter Zwischenraum (8) besteht. 14. Lining according to one of claims 1 to 12, characterized in that between the ceramic plates (5) and the tube wall (1), in particular a ventilated gap (8).
15. Auskleidung nach Anspruch 14, dadurch gekennzeichnet, dass der15. Lining according to claim 14, characterized in that the
Zwischenraum (8) mit wärmeleitendem Mörtel verfüllt ist. Interspace (8) is filled with thermally conductive mortar.
PCT/EP2009/000583 2008-01-31 2009-01-29 Lining of a furnace chamber WO2009095244A1 (en)

Applications Claiming Priority (2)

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DE102008006894.2 2008-01-31
DE200810006894 DE102008006894A1 (en) 2008-01-31 2008-01-31 Lining of a firebox

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CN111023140A (en) * 2019-12-13 2020-04-17 北京华电德高科技有限责任公司 Laser cladding high-temperature-resistant anti-abrasion structure for special-shaped water wall tube bank

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CN111023140A (en) * 2019-12-13 2020-04-17 北京华电德高科技有限责任公司 Laser cladding high-temperature-resistant anti-abrasion structure for special-shaped water wall tube bank

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