Patent US3828735A successfully refreshed from Google Patents.
US3828735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler tube shielding wall
Assignee: C AND H COMBUSTION CO
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Filing: 1973-01-15
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Granted: 1974-08-13
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Expires: 1993-01-15
Abstract
Abstract A shielding or insulating wall of discrete tiles is removably secured in front of the impingement surfaces of boiler tubes in the burner region of the boiler furnace chamber for shielding the lower regions of the boiler tubes against excessive heating in order to force combustion gases to rise into the superheat and reheat regions of the boiler to develop and maintain required higher temperatures in such latter regions, or to protect the boiler tubes from direct impingement of burner flames which tend to generate and accelerate their premature deterioration. The shielding wall of tile is free-floating with the expansion and contraction of the boiler tubes, whose load and temperature variation in the burner region of the furnace area normally results in cracking and decay of a fixed continuous shielding wall material as currently practiced.
Inventors
- 👤 R Graham
- 👤 D Frame
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:05
CPC Classifications
F; F23; F23M; F23M5/00; F23M5/08; F23M5/04
Claims Analysis
Total Claims: 56
Claim 1
Independent Claim
298 words
In a wall of ceramic fire brick or tile to shield at least a portion of a water wall of substantially parallel relatively closely adjacent but spaced apart boiler tubes extending vertically upwardly in and from the burner region of a boiler tube furnace area from direct impingement of burner-produced flames and combustion gases upon the facing exposed surfaces of said boiler tubes, and to deflect a significant portion of the heat generated by said flames and combustion gases into the superheat region of the boiler unit thereabove, the improvement combination comprising at least one pair of said parallel relatively closely adjacent but spaced apart vertically extending boiler tubes, a plurality of shielding tiles for said boiler tubes, means to support said plurality of shielding tiles in substantially vertical files adjacent the said facing exposed surfaces of said boiler tubes, said support means being fixedly secured to said boiler tubes, and free-floating tile retaining means manually removably engageable with said boiler tubes and with an upper portion of each said tile in said files, to secure each said tile in shielding relationship to said boiler tubes, each of said tiles comprising a unitary ceramic body having a distal front face, lateral side walls, a proximal rear face, and a top wall surface having a transverse slot therein, one of said side walls having a longitudinally extending rib portion and the other of said side walls having a longitudinally extending recess complementary to said rib portion, said rib portion and recess being aligned with each other transversely of said body, whereby said tiles are relatively free-floating with the expansion and contraction movements of said boiler tubes, and said rib portions and recesses of laterally adjacent tiles dovetail with each other when said tiles are arranged in parallel side-by-side relationship.
Claim 2
Dependent Claim
298 words
In a wall of ceramic fire brick or tile to shield at least a portion of a water wall of substantially parallel relatively closely adjacent but spaced apart boiler tubes extending vertically upwardly in and from the burner region of a boiler tube furnace area from direct impingement of burner-produced flames and combustion gases upon the facing exposed surfaces of said boiler tubes, and to deflect a significant portion of the heat generated by said flames and combustion gases into the superheat region of the boiler unit thereabove, the improvement combination comprising at least one pair of said parallel relatively closely adjacent but spaced apart vertically extending boiler tubes, a plurality of shielding tiles for said boiler tubes, means to support said plurality of shielding tiles in substantially vertical files adjacent the said facing exposed surfaces of said boiler tubes, said support means being fixedly secured to said boiler tubes, and free-floating tile retaining means manually removably engageable with said boiler tubes and with an upper portion of each said tile in said files, to secure each said tile in shielding relationship to said boiler tubes, each of said tiles comprising a unitary ceramic body having a distal front face, lateral side walls, a proximal rear face, and a top wall surface having a transverse slot therein, one of said side walls having a longitudinally extending rib portion and the other of said side walls having a longitudinally extending recess complementary to said rib portion, said rib portion and recess being aligned with each other transversely of said body, whereby said tiles are relatively free-floating with the expansion and contraction movements of said boiler tubes, and said rib portions and recesses of laterally adjacent tiles dovetail with each other when said tiles are arranged in parallel side-by-side relationship.
Claim 3
Dependent Claim
66 words
The structural combination defined in claim 1, wherein said means to support said plurality of shielding tiles comprises a plate portion disposed at an angle to the plane of said boiler tubes and fixedly secured to said boiler tubes, and a tile retaining portion at the distal edge of said plate portion to engage said tile resting upon said plate portion and retain the same thereon.
Claim 4
Dependent Claim
60 words
The structural combination defined in claim 2, wherein said plate portion is provided with a proximal edge substantially complementary to the facing exposed surfaces of said boiler tubes, portions of said proximal edge being welded to said boiler tube surfaces. 4. The structural combination defined in claim 2, wherein said plate and tile retaining portions comprise a unitary angle plate.
Claim 5
Dependent Claim
47 words
The structural combination defined in claim 3, wherein said boiler tubes are cylindrical and have convexly curved outer facing surfaces extending axially of said tubes, and said plate portion proximal edge is provided with concavely arcuate portions complementary to said boiler tube convexly curved outer facing surfaces.
Claim 6
Dependent Claim
23 words
The structural combination defined in claim 5, wherein said arcuate edge portions are at least in part welded to said boiler tube surfaces.
Claim 7
Dependent Claim
25 words
The structural combination defined in claim 2, wherein said plate portion is disposed in a plane substantially normal to the plane of said boiler tubes.
Claim 8
Dependent Claim
19 words
The structural combination defined in claim 1, wherein said transverse slot extends from one side wall to the other.
Claim 9
Dependent Claim
23 words
The structural combination defined in claim 1, wherein said transverse slot is spaced from and extends substantially parallel to said distal front face.
Claim 10
Dependent Claim
28 words
The structural combination defined in claim 1, wherein said tile body further comprises a distal undercut bottom wall surface extending rearwardly to a depending proximal lower flange portion.
Claim 11
Dependent Claim
21 words
The structural combination defined in claim 1, wherein said rib portion and recess are disposed substantially medially of said side walls.
Claim 12
Dependent Claim
33 words
The structural combination defined in claim 1, wherein said proximal rear face comprises in part a pair of longitudinally extending substantially parallel concavely curved wall surfaces at the proximal corners of said tile.
Claim 13
Dependent Claim
24 words
The structural combination defined in claim 12, wherein said concavely curved wall surfaces are spaced apart by a medial longitudinally extending web face therebetween.
Claim 14
Dependent Claim
32 words
The structural combination defined in claim 12, wherein said concavely curved wall surfaces have a transverse curvature substantially complementary to the adjacent portions of the outer facing surfaces of said boiler tubes.
Claim 15
Dependent Claim
33 words
The structural combination defined in claim 1, wherein said tile body further comprises a proximal upper flange portion extending rearwardly of said slot and being lower in height than said top wall surface.
Claim 16
Dependent Claim
16 words
The structural combination defined in claim 1, wherein said tile body is generally rectilinear in configuration.
Claim 17
Dependent Claim
89 words
The structural combination defined in claim 1, wherein said manually removably engageable tile retaining means comprises a distal plate member engageable with at least one said tile in said file, a stem having one end secured to said distal plate member and extending axially normal to the plane of said plate member, and a boiler tube engaging member secured to the other or proximal end of said stem, extending rearwardly from and in the plane of said stem and substantially normal to the plane of said distal plate member.
Claim 18
Dependent Claim
23 words
The structural combination defined in claim 17, wherein said one stem end is secured substantially medially and central of said distal plate member.
Claim 19
Dependent Claim
21 words
The structural combination defined in claim 17, wherein said stem is secured substantially to one edge of said distal plate member.
Claim 20
Dependent Claim
105 words
The structural combination defined in claim 17, wherein said stem and said boiler tube engaging member each have a cross-sectional thickness no greater than the free clear distance between said pair of spaced apart adjacent boiler tubes, and said boiler tube engaging member has a transverse width substantially greater than such free clear distance between said adjacent boiler tubes, whereby said boiler tube engaging pOrtion and said stem of said tile retaining means are insertable between said boiler tubes and, upon rotation of said stem and boiler tube engaging member, said free-floating tile retaining means is engaged with said boiler tubes at their proximal sides.
Claim 21
Dependent Claim
210 words
The structural combination defined in claim 15, wherein said manually removably engageable tile retaining means comprises a distal plate member engageable with at least one said tile in said file, a stem having one end secured to said distal plate member and extending axially normal to the plane of said plate member, and a boiler tube engaging member secured to the other or proximal end of said stem, extending rearwardly from and in the plane of said stem and substantially normal to the plane of said distal plate member, said stem and boiler tube engaging member each having a cross-sectional thickness no greater than the free clear distance between said pair of spaced apart adjacent boiler tubes, said boiler tube engaging member having a transverse width substantially greater than such free clear distance between said adjacent boiler tubes, said distal plate member being engageable with said proximal upper flange portion of said tile in said slot when said stem is at rest upon said proximal upper flange portion, the proximal portion and stem of said tile retaining means having been inserted between said boiler tubes and, upon rotation of said stem and boiler tube engaging member, said tile retaining means having engaged said boiler tubes at the latters'' proximal sides.
Claim 22
Dependent Claim
37 words
The structural combination defined in claim 20, wherein said boiler tube engaging member is planar and, when rotated into engagement with said boiler tubes, lies in a plane substantially normal to the plane of said boiler tubes.
Claim 23
Dependent Claim
67 words
The structural combination defined in claim 20, wherein when said proximal boiler tube engaging member and said stem are inserted between said boiler tubes and said engaging member extends inwardly beyond the surfaces of said adjacent boiler tubes, said tile retaining means is manually rotatable upon grasping said distal plate member and rotating the same in a plane substantially parallel to the plane of said boiler tubes.
Claim 24
Dependent Claim
131 words
The structural combination defined in claim 1, wherein said plurality of shielding tiles are arranged in one or more banks of tiles forming said shielding wall, each said bank comprising a plurality of vertical files of tiles supported upon said supporting means, said files having their tiles in horizontal parallel alignment with each other to form horizontal courses, a superior bank of said tiles being spaced vertically above an inferior bank to provide a horizontal gap therebetween for facile manual removal and engagement of the uppermost of said tile retaining means with the most superior tiles of said inferior bank, and a heat insulating packing material disposed in said gap to close said gap against impingement of burner flames and combustion gases upon the exposed surfaces of said boiler tubes therebehind.
Claim 25
Dependent Claim
34 words
The structural combination defined in claim 5, and wherein said plate portion further comprises a web portion intermediate said concavely arcuate edge portions, said plate portion being supportive of a plurality of said tiles.
Claim 26
Dependent Claim
29 words
The structural combination defined in claim 2, wherein said tile retaining portion at the distal edge of said plate portion is substantially coextensive in length with said plate portion.
Claim 27
Dependent Claim
16 words
The structural combination defined in claim 2, wherein said tile retaining portion comprises an upstanding flange.
Claim 28
Dependent Claim
85 words
The structural combination defined in claim 1, wherein said free-floating tile retaining means comprises a distal member removably engageable with at least one said tile in said vertical files, a stem having one end thereof secured to said distal member and extending axially normal to the plane of said distal member, and a boiler tube engaging member secured to the proximal end of said stem, extending rearwardly from and in the plane of said stem and substantially normal to the plane of said distal member.
Claim 29
Dependent Claim
19 words
The structural combination defined in claim 1, wherein each said tile comprises a unitary ceramic body of silicon carbide.
Claim 30
Dependent Claim
46 words
The structural combination defined in claim 1, wherein said free-floating tile retaining means each comprises a plate portion having lateral edges intermediate its distal and proximal edges engageable with said boiler tubes, and a distal member engageable with a plurality of tiles at their upper ends.
Claim 31
Dependent Claim
19 words
The structural combination defined in claim 30, wherein said free-floating tile retaining means each comprises substantially an angle plate.
Claim 32
Dependent Claim
28 words
The structural combination defined in claim 30, wherein said lateral edges have arcuate edge portions with a curvature substantially complementary to the convex curvature of said boiler tubes.
Claim 33
Dependent Claim
16 words
The structural combination defined in claim 30, wherein said distal member comprises a depending tile-engaging flange.
Claim 34
Dependent Claim
25 words
The structural combination defined in claim 30, wherein said palte portion is adapted to rest upon the proximal upper top wall surfaces of said tiles.
Claim 35
Dependent Claim
25 words
The structural combination defined in claim 31, wherein said angle plate is adapted to rest upon the proximal upper top wall surfaces of said tiles.
Claim 36
Dependent Claim
28 words
The structural combination defined in claim 32, wherein the root distance between said lateral arcuate edge portions is less than the clear free distance between said boiler tubes.
Claim 37
Dependent Claim
35 words
The structural combination defined in claim 30, wherein said plate portion is adapted to removably engage said boiler tubes and to move relative to said boiler tubes in response to their expansion and contraction movements.
Claim 38
Dependent Claim
84 words
The structural combination defined in claim 1, wherein said free-floating tile retaining means each comprises in combination substantially parallel aligned spaced apart distal and proximal bars, transverse rib members fixedly secured to said parallel bars adjacent but spaced from the ends of said bars so that said parallel bars project laterally beyond said transverse rib members, the ends of said proximal parallel bar being engageable with said boiler tubes, said distal parallel bar being engageable with a plurality of tiles at their upper ends.
Claim 39
Dependent Claim
26 words
The structural combination defined in claim 38, wherein said transverse rib members are adapted to rest upon the proximal upper top wall surfaces of said tiles.
Claim 40
Dependent Claim
27 words
The structural combination defined in claim 38, wherein the overall distance between said transverse rib members is less than the clear free distance between said boiler tubes.
Claim 41
Dependent Claim
22 words
The structural combination defined in claim 38, wherein said distal parallel bar depends from said transverse rib members in tile engaging posture.
Claim 42
Dependent Claim
43 words
The structural combination defined in claim 38, wherein the combination of said conjoined parallel bars and transverse rib members is adapted to removably engage said boiler tubes and to move relative to said boiler tubes in response to their expansion and contraction movements.
Claim 43
Dependent Claim
36 words
The structural combination defined in claim 1, wherein said proximal rear face comprises a longitudinally extending concavely curved wall surface forming one corner of said tile at its proximal end and an adjacent proximal wall surface.
Claim 44
Dependent Claim
30 words
The structural combination defined in claim 43, wherein said concavely curved wall surface has a transverse curvature substantially complementary to the convex curvature of the boiler tube next thereto adjacent.
Claim 45
Dependent Claim
53 words
The structural combination defined in claim 1, wherein said proximal rear face comprises a pair of longitudinally extending notched wall surfaces at its proximal corners, complementary to and adapted to receive portions of the convexly curved wall surface of said boiler tubes therewithin, and an intermediate substantially medial longitudinally extending web portion therebetween.
Claim 46
Dependent Claim
49 words
The structural combination defined in claim 1, wherein said proximal rear face comprises a longitudinally extending notched wall surface at one proximal corner, complementary to and adapted to receive a portion of the convexly curved wall surface of one said boiler tube therewithin, and an adjacent proximal wall surface.
Claim 47
Dependent Claim
26 words
The structural combination defined in claim 1, wherein said tile top wall surface is further provided with a transverse upstanding flange anterior of said transverse slot.
Claim 48
Dependent Claim
21 words
The structural combination defined in claim 47, wherein said upstanding flange is disposed adjacent and substantially coextensive with said transverse slot.
Claim 49
Dependent Claim
42 words
The structural combination defined in claim 48, wherein said tile top wall surface further comprises a proximal top wall portion posterior of said transverse slot at a plane lower than the plane of said top wall surface anterior of said upstanding flange.
Claim 50
Dependent Claim
36 words
The structural combination defined in claim 47, wherein each of said tiles further comprises a bottom wall surface having a transverse slot therein substantially parallel to, aligned and coextensive with said top wall surface upstanding flange.
Claim 51
Dependent Claim
24 words
The structural combination defined in claim 50, wherein said bottom wall surfaces on each side of said transverse slot lie in a common plane.
Claim 52
Dependent Claim
22 words
The structural combination defined in claim 47, wherein said tile top wall surface upstanding flange extends from side wall to side wall.
Claim 53
Dependent Claim
21 words
The structural combination defined in claim 50, wherein said bottom wall surface transverse slot extends from side wall to side wall.
Claim 54
Dependent Claim
31 words
The structural combination defined in claim 1, wherein one said tile in a course of said tiles extends substantially across the space between parallel centerlines of and before adjacent boiler tubes.
Claim 55
Dependent Claim
41 words
The structural combination defined in claim 1, wherein a pair of said tiles are disposed in side by side relationship in a course of said tiles and extend substantially across the space between parallel centerlines of and before adjacent boiler tubes.
Claim 56
Dependent Claim
42 words
The structural combination defined in claim 1, wherein three or more of said tiles are disposed in side by side relationship in a course of said tiles and extend substantially across the space between parallel centerlines of and before adjacent boiler tubes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |