Patentamt
Jê E u r o p European
a i s c h e Patent
s
Office
(ÏÏ) Publication number:
Office européen des brevets
EUROPEAN
©
PATENT
(§) Dateof publication of patent spécification: 10.12.86
0 077
6 0 8
g 1
SPECIFICATION
(g) Int. Cl.4: F 27 D 1/00,
F 27 D 1 / 1 4
(D Application number: 82304821.0
(§) Dateoffiling: 13.09.82
(54) Thermally insulative modules for lining furnaces or like equipment.
(§) Priority: 16.10.81 US 312047
(§) Date of publication of application:
27.04.83 Bulletin 83/17
(§) Publication of the grant of the patent:
10.12.86 Bulletin 86/50
(H) Designated Contractinj States:
BEDEFRGBITSE
(§) Références cited:
EP-A-0 013 039
FR-A-2 321 101
FR-A-2 393 254
US-A-3 819468
US-A-3 832 815
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® Proprietor: THE BABCOCK & WILCOX
COMPANY
1010 Common Street P.O. Box 60035
New Orléans Louisiana 70160 (US)
® Inventor: Oxford, Roger Charles
2328 Allen Avenue
Augusta Georgia 30906 (US)
Inventor: Ferguson, Alan Corbett
423 Ashland Drive
Augusta Georgia 30909 (US)
Inventor: Gordon, Melvin Léon
2647 Cranbrook Drive
Hephzibah Georgia 30815 (US)
(74) Représentative: Cotter, Ivan John et al
D. YOUNG & CO. 10 Staple Inn
LondonWC1V7RD (GB)
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Note: Within nine months from the publication of the mention of the grant of the European patent, any person may
give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall
be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been
paid. (Art. 99(1 ) European patent convention).
Courier Press, Leamington Spa, England.
The present invention relates to thermally insulative modules for lining furnaces or like equipment.
Several ceramic fibre modular designs for furnace linings presently exist. Many such modules
comprise individual strips of refractory fibre
blanket stacked edgewise and either cemented to
an expanded metal substrate by means of
ceramic cement or mortar, or held together by
retainer members having a base portion running
the length of the individual strips, as exemplified
in US Patents Nos. US-A-3 940 244 and
U S - A - 3 832 815. Other known modular designs
are composed of a compressed continuous strip
of pleated thermally insulative blanket with two of
the outer pleats (cold face pleats) mechanically
supported by its metal frame. The supports run
substantially the length of the fold or pleat. The
module's metal frame allows it to successively
attach to the adjacent modules. Once attached,
the modules are mounted to the furnace walls
using studs or fastening clips affixed to the walls,
as exemplified by US Patents Nos. U S - A 4 001 996 and U S - A - 4 103 469.
However, problems still exist with certain types
of insulation modules. Ceramic fibre blankets
and, therefore, the modules made thereof are not
mechanically strong and must be handled with
great care to avoid tearing. Ceramic fibre blanket
material is known to shrink when exposed to temperatures in excess of 1093°C (2000°F). Known
modules utilising blankets of such material for
lining of furnaces have encountered difficulties
caused by said shrinkage of the material. Shrinkage has caused separations between folds within
a module and between modules themselves,
thereby exposing the furnace shell and critical
retainer members to the heat of the interior of the
furnace. Shrinkage has also caused the pleats of a
folded blanket configuration to unfold and hence
sag since not all cold faced pleats were
supported.
US Patent No. U S - A - 4 287 839 ( E P - A 0 013 039) discloses a thermally insulative module for lining a furnace, the module comprising an
insulative blanket folded into a plurality of inner
folds and outer folds, a support means having a
base and a mounting means and a retaining
means at each end thereof, the plurality of outer
folds of the blanket being positioned between the
retaining means of the support means, and fold
support rod means extending through the plurality of outer folds of the blanket and attached to
the retaining means. Such a module is referred to
hereinbelow as "a module of the kind described
in U S - A - 4 287 839".
The base portion of the support means of the
module of U S - A - 4 287 839 is in the form of a
base plate whose length and width are substantially the same as the length and width of the
module. The mounting means at each end of the
support means comprises a pair of hooks rotatably mounted to the base plate. The retaining
means at each end of the support means comprises a pair of lugs that are spaced apart in the
direction of the width of the module and are
bolted or otherwise fixed to the base plate. The
lugs are disposed externally of the folded blanket.
The fold rod support means comprises two fold
support rods that are spaced apart in the direction
of the width of the module. Each rod is fixed at
each end to a respective one of the two lugs at
each end of the module.
The pres nt invention provides a module of the
kind described in US-A-4 287 839, characterised in that:
(i) the support means is in the form of an
elongate support bracket having an elongate base
of width substantially less than that of the folded
blanket;
(ii) the mounting means at each end of the
elongate support bracket (20) is in the form of a
bracket mounting member (26);
(iii) the retaining means at each end of the
elongate support bracket (20) is in the form of a
protected upturned bracket retaining member
(24); and
(iv) the fold support rod means is in the form of
a single fold support rod (30) attached at each end
to a respective one of the bracket retaining members (24).
The present inventors have found that such a
simple structure will function satisfactorily in
spite of the above-described problems caused by
the fragility and tendency to shrink of the blanket
material.
The simplicity of the construction of the
arrangement can be enhanced if each bracket
mounting member is end-slotted or has at least
one hole therein, especially if the slots or holes
are sized to accept threaded studs for mounting
the module to a furnace or like equipment. The
simplicity can further be enhanced if a bracket
mounting member comprises an elongate integral extension of the elongate base and/or if a
bracket retaining member is integral with the
elongate base.
Preferably, the upturned bracket retaining
member at each end of the elongate support
bracket is protected by virtue of its being disposed between an outer fold and an end flap of
the blanket. In this way, the retaining members
(as well as the fold support rod) is protected from
the environment of the furnace or like equipment
by virtue of its being disposed within the body of
material defined by the folded blanket.
Modules forming preferred embodiments of
the present invention and described hereinbelow
can be used to line furnace walls and ceilings. The
modules can be attached to a furnace wall or
ceiling having threaded studs and/or other fastening devices. The blanket of the preferred modules
is under compression before and after installation. The preferred modules resist unravelling
and/or lamination of the layers of insulative
blanket.
The invention will now be further described, by
way of illustrative and non-limiting example, with
reference to the accompanying drawings, in
which
Figure 1 is an isometric view of a module
embodying this invention; and
Figure 2 is an isometric view of another module
embodying this invention.
Each figure of the drawings illustrates a rodanchored, accordion-fold, full-lining thermally insulative module 10 to be used for insulating a
furnace or other high temperature equipment.
The module 10 is preformed from a folded or
pleated ceramic fibre insulating blanket 12 and a
support bracket 20. Folds or pleats 14 and 16 exist
at the hot or inner and cold or outer faces, respectively, of the module 10. The support bracket 20
has a base 22, and also has a protected upturned
retaining member 24 and a mounting member 26
at each end thereof. A pleat support rod 30
extends between the retaining members 24 of
each support bracket 20. The rod 30 is threaded
perpendicularly through each cold face pleat 16
and is located near the outer or cooler face of the
module 10 and parallel thereto.
The outer or cooler face of the module 10, also
referred to as the cold face, is defined as that
surface of the module which comes into contact
with the furnace wall. The hot face of the module
10 is defined as that surface of the module which
is exposed to the interior of the furnace. Therefore, the module 10 has both hot face or inner
folds or pleats 14 and cold face or outer folds or
pleats 16. The pleat support rod 30 not only holds
the ceramic fibre blanket 12 in compression, but
also serves to retain each pleat 16 within the
module 10. Each end of the pleat support rod 30 is
attached to a support bracket retaining member
24. Each retaining member 24 is situated between
an outer fold and end flap of the module, whereby
the member 24 is protected from the detrimental
effects of the furnace environment. Any conventional means of attachment can be used. However, the rod 30 will typically be end-threaded so
that a nut at each end of the rod will keep the rod
secured to the support bracket20.
The folded ceramic fibre insulating blanket 12 is
formed from a suitable commercially available
ceramic fibre sheet such as the type known under
the trademark KAOWOOL and sold by The Babcock & Wilcox Company. It should be understood
that the particular type of insulating blanket used
is selected in accordance with the range of temperatures in the high temperature equipment in
which the apparatus is to be installed.
The folded blanket 12 is compressed prior to
being placed within the support members 24 of
the support bracket 20. This compression is calculated to compensate for thermal shrinkage of the
blanket material that occurs during use of the
module. Banding material (not shown) is then
placed around the module 10 at or near the two
ends so that the banding material is in parallel
relationship with the support rod 30. The banding
material ensures that the folds and end flaps of
the module remain substantially square and compressed during package, shipping and placement.
Once installation of the furnace wall or ceiling is
complete, the banding material is removed.
A modular block fibre lining formed from a
plurality of the modules 10 is typically installed in
parquet fashion such that adjacent modules are
turned 90° before installation. The present modular design represents a full furnace lining and as
such can be used alone. However, if desired, a
safety or backup liner layer of wallpaper insulation blanket can be used behind the module as
further protection for the furnace shell.
In both the illustrated embodiments the mounting members 26 are end-slotted. The mounting
members 26 may instead each have at least one
hole therein. In all cases, the members 26 are
preferably sized to accept threaded studs (not
shown) mounted to the furnace.
1. A thermally insulative module for lining a
furnace or like equipment, the module (10) comprising an insulative blanket (12) folded into a
plurality of inner folds (14) and outer folds (16), a
support means having a base (22) and a mounting
means and a retaining means at each end thereof,
the plurality of outer folds (16) of the blanket (12)
being positionedbetween the retaining means of
the support means, and fold support rod means
extending through the plurality of outer folds (16)
of the blanket (12) and attached to the retaining
means, characterised in that:
(i) the support means is in the form of an
elongate support blanket (20) having an elongate
base (22) of width substantially less than that of
the folded blanket (12);
(ii) the mounting means at each end of the
elongate support bracket (20) is in the form of a
bracket mounting member (26);
(iii) the retaining means at each end of the
elongate support bracket (20) is in the form of a
protected upturned bracket retaining member
(24); and
(iv) the fold support rod means is in the form of
a single fold support rod (30) attached at each end
to a respective one of the bracket retaining members (24).
2. A module according to claim 1, wherein the
bracket mounting members (26) are end-slotted.
3. A module according to claim 1, wherein each
bracket mounting member (26) has at least one
hole therein.
4. A module according to claim 2 or claim 3,
wherein the slot or hole of each bracket mounting
member (26) is sized to accept a threaded stud
mounted to a furnace or like equipment.
5. A module according to any one of the preceding claims, wherein a bracket mounting
member (26) comprises an elongate integral extension of the elongate base (22).
6. A module according to any one of the preceding claims, wherein a bracket retaining
member (24) is integral with the elongate base
(22).
7. A module according to any one of the pre-
ceding claims, wherein the upturned bracket retaining member (24) at each end of the elongate support bracket (20) is protected by virtue
of its being disposed between an outer fold
and an end flap of the blanket (12).
8. A module according to any one of the preceding claims, wherein the plurality of outer
folds (16) is compressed within the two retaining members (24).
9. A lining for a furnace or like equipment,
the lining comprising a plurality of modules
(10) according to any one of the preceding
claims and an attachment means securing each
mounting member (26) of each module (10) to
the furnace or like equipment, adjacent modules (10) being mounted such that the plurality
of inner folds (14) of one module is in compressive contact with the plurality of inner folds
(14) of each of a plurality of adjacent modules.
10. A lining according to claim 9, wherein
each module (10) is mounted at a position rotated by 90° with respect to adjacent modules.
1. Wärmeisolierelement für die Auskleidung
eines Ofens oder einer ähnlichen Einrichtung,
wobei das Element (10) eine Isolierdecke (12),
die zu mehreren inneren Falten (14) und äußeren Falten (16) gefaltet ist, eine Stützeinrichtung
mit einem Basisteil (22) und einer Befestigungseinrichtung und einer Halteeinrichtung an jedem ihrer Enden aufweist, wobei die mehreren
äußeren Falten (16) der Decke (12) zwischen
der Halteeinrichtung der Stützeinrichtung angeordnet sind und ein Faltentragestab sich durch
mehrere der äußeren Falten (16) der Decke (12)
erstreckt und an der Halteeinrichtung befestigt
ist, dadurch gekennzeichnet, daß
(i) die Stützeinrichtung in der Form einer
länglichen Stützlasche (20) mit einem länglichen Basisteil (22) einer wesentlich geringeren
Breite als jene der gefalteten Decke (12) vorliegt,
(ii) die Befestigungseinrichtung an jedem
Ende der länglichen Stützlasche (20) in der Form
eines Laschenbefestigungsteils (26) vorliegt,
(iii) die Halteeinrichtung an jedem Ende der
länglichen Stützlasche (20) in der Form eines
Laschenhalteteils
geschützten
umgebogenen
(24) vorliegt und
(iv) der Faltentragestab in der Form eines einzelnen Faltentragestabes (30) vorliegt, der an
jedem Ende jeweils eines der Laschenhalteteile
(24) befestigt ist.
2. Element nach Anspruch 1, bei dem die
Laschenbefestigungsteile (26) am Ende geschlitzt sind.
3. Element nach Anspruch 1, bei dem jedes
Laschenbefestigungsteil (26) wenigstens ein
Loch darin hat.
4. Element nach Anspruch 2 oder Anspruch
3, bei dem der Schlitz oder das Loch eines
jeden Laschenhalteteils (26) so bemessen ist,
daß er bzw. es einen Gewindebolzen aufnimmt,
der an einem Ofen oder einer ähnlichen Einrichtung befestigt ist.
5. Element nach einem der vorausgehenden
Ansprüche, bei dem das Laschenbefestigungsteil (26) eine längliche Verlängerung aus einem
Stück mit dem länglichen Basisteil (22) besitzt.
6. Element nach einem der vorausgehenden
Ansprüche, bei dem ein Laschenhalteteil (24)
aus einem Stück mit dem länglichen Basisteil
(22) besteht.
7. Element nach einem der vorausgehenden
Ansprüche, bei dem das umgebogene Laschenhalteteil (24) an jedem Ende der länglichen
Stützlasche (22) dadurch geschützt ist, daß es
zwischen einer äußeren Falte und einem umgeschlagenen Endeteil der Decke (12) angeordnet
ist.
8. Element nach einem der vorausgehenden
Ansprüche, bei dem die mehreren äußeren Falten (16) zwischen den beiden Halteteilen (24)
zusammengepreßt sind.
9. Auskleidung für einen Ofen oder eine ähnliche Einrichtung mit mehreren Elementen (10)
nach einem der vorausgehenden Ansprüche
und Befestigungseinrichtungen, die jeweils ein
Befestigungsteil (26) eines jeden Elementes (10)
an dem Ofen oder der ähnlichen Einrichtung
befestigen, wobei einander benachbarte Elemente (10) so befestigt sind, daß die mehreren
inneren Falten (14) eines Elementes in zusammengepreßter Berührung mit den mehreren in. neren Falten (14) eines jeden von mehreren
benachbarten Elementen stehen.
10. Auskleidung nach Anspruch 9, bei der jedes Element (10) in einer um 90° bezüglich der
benachbarten Elemente gedrehten Stellung befestigt ist.
1. Module d'isolation thermique pour le garnissage d'un four ou équipement analogue, le
module (10) comprenant une couverture isolante (12) pliée en une série de plis intérieurs
(14) et de plis extérieurs (16), un moyen de
support comportant une base (22) et un moyen
de montage et une moyen de retenue à chacune de ses extrémités, la série de plis extérieurs (16) de la couverture (12) étant placés
entre les moyens de retenue du moyen de support, et des moyens du type tige de support de
plis s'étendant à travers la série de plis extérieurs (16) de la couverture (12) et fixés aux
moyens de retenue, caractérisé en ce que:
(i) le moyen de support se présente sous la
forme d'une console de support oblongue (20)
présentant une base oblongue (22) de largeur
sensiblement inférieure à celle de la couverture
(12) pliée;
(ii) le moyen de montage prévu à chaque
extrémité de la console de support oblongue
(20) se présente sous la forme d'un montage
de montage de console (26);
(iii) le moyen de retenue prévu à chaque
extrémité de la console de support oblongue
(20) se présente sous la forme d'un organe
de retenue de console tourné vers le haut
protégé (24); et
(iv) le moyen du type tige de support de
plis se présente sous le forme d'une seule
tige de support de plis (30) fixée à chaque
extrémité à l'un, respectif, des organes de retenue de console (24).
2. Module selon la revendication 1, dans lequel les organes de montage de console (26)
sont fendus aux extrémités.
3. Module selon la revendication 1, dans lequel chaque organe de montage de console
(26) présente au moins un trou.
4. Module selon l'une quelconque des
revendications 2 ou 3, dans lequel la fente ou
le trou de chaque organe de montage de
console (26) est dimensionné de façon à recevoir un goujon fileté monté dans un four ou
équipement analogue.
5. Module selon l'une quelconque des
revendications précédentes, dans lequel un organe de montage de console (26) est constitué par un prolongement intégrant oblong de
la base oblongue (22).
6. Module selon l'une quelconque des
revendications précédentes, dans lequel un organe de retenue de console (24) est solidaire
de la base oblongue (22).
7. Module selon l'une quelconque des
revendications précédentes, dans lequel l'organe de retenue de console tourné vers le
haut (24) situé à chaque extrémité de la
console de support oblongue (20) est protégé
du fait qu'il est interposé entre un pli extérieur et un rabat d'extrémité de la couverture
(12).
8. Module selon l'une quelconque des
revendications précédentes, dans lequel la série de plis extérieurs (16) est comprimée entre
les deux organes de retenue (24).
9. Garnissage pour four ou équipement analogue, le garnissage étant constitué par une
série de modules (10) selon l'une quelconque
des revendications précédentes et un moyen
de fixation fixant chaque organe de montage
(26) de chaque module (10) au four ou
équipement analogue, les modules (10) voisins étant montés en sorte que la série de
plis intérieurs (14) d'un module soit en
contact sous compression avec la série de
plis intérieurs (14) de chacun d'une série de
modules voisins.
10. Garnissage selon la revendication 9,
dans lequel chaque module (10) est monté en
position décalée de 90° par rapport aux
modules voisins.