Patent FR1504155A successfully refreshed from Google Patents.
US3850146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler tube shielding wall
Assignee: Individual
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Filing: 1974-02-22
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Granted: 1974-11-26
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Expires: 1994-02-22
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
2026-10-26 00:04
CPC Classifications
F; F23; F23M; F23M5/00; F23M5/08; F23M5/04
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
335 words
In a wall of ceramic fire brick or tile to shield at least a portion of a water wall of substantially parallel closely adjacent but spaced apart boiler tubes, secured together to form an impenetrable water wall by lateral rib members affixed to said boiler tubes and to each other, and 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 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 comprising a bar device manually removably engageable with said support means and a free-floating tile retaining clip manually removably engageable with an upper portion of each said tile in said files and with said bar device, 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
335 words
In a wall of ceramic fire brick or tile to shield at least a portion of a water wall of substantially parallel closely adjacent but spaced apart boiler tubes, secured together to form an impenetrable water wall by lateral rib members affixed to said boiler tubes and to each other, and 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 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 comprising a bar device manually removably engageable with said support means and a free-floating tile retaining clip manually removably engageable with an upper portion of each said tile in said files and with said bar device, 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
40 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.
Claim 5
Dependent Claim
19 words
The structural combination defined in claim 2, wherein said plate and tile retaining portions comprise a unitary angle plate.
Claim 6
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 7
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 8
Dependent Claim
39 words
The structural combination defined in claim 5, wherein said plate portion proximal edge is further provided with a notch in the web portion intermediate said concavely arcuate edge portions, and a notch at each corner of said proximal edge.
Claim 9
Dependent Claim
61 words
The structural combination defined in claim 7, wherein said tile support means further comprises a plurality of said plate portions arranged in horizontal alignment and secured to a plurality of pairs of said boiler tubes, said notches at adjacent corners of each plate portion proximal edge forming a combination notch substantially equal in width and depth to said web portion notch.
Claim 10
Dependent Claim
17 words
The structural combination defined in claim 2, wherein said distal tile retaining portion comprises an upstanding flange.
Claim 11
Dependent Claim
40 words
The structural combination defined in claim 1, wherein said tile ceramic body top wall surface transverse slot extends from one side wall to the other, said transverse slot being spaced from and extending substantially parallel to said distal front face.
Claim 12
Dependent Claim
28 words
The structural combination defined in claim 10, wherein said tile body further comprises a distal undercut bottom wall Surface extending rearwardly to a depending proximal lower flange portion.
Claim 13
Dependent Claim
66 words
The structural combination defined in claim 10, wherein said proximal rear face comprises a pair of substantially adjacent longitudinally extending substantially parallel concavely curved wall surfaces, said concavely curved wall surfaces being spaced apart by a medial longitudinally extending web portion therebetween, said concavely curved wall surfaces having a transverse curvature substantially complementary to the adjacent portion of the outer facing surfaces of said boiler tubes.
Claim 14
Dependent Claim
33 words
The structural combination defined in claim 10, 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 15
Dependent Claim
31 words
The structural combination defined in claim 12, wherein said web portion intermediate said concavely curved wall surfaces is provided with a longitudinal slot extending the length of said proximal rear face.
Claim 16
Dependent Claim
83 words
The structural combination defined in claim 8, wherein said bar device comprises a pair of parallel bars, a pin securing said parallel bars in spaced apart relationship and fixedly positioned adjacent one end of said parallel bars, said pin having end portions extending laterally outwardly from said parallel bars at each side of said bar device, and a pair of spacer bars securing said parallel bars in spaced apart relationship and fixedly positioned at the opposite end of said parallel bars and therebetween.
Claim 17
Dependent Claim
55 words
The structural combination defined in claim 15, wherein said spacer bars lie in a plane normal to the axis of said pin, and in spaced apart relationship a distance substantially equal to and slightly greater than the diameter of said pin, said spacer bars extending longitudinally from and beyond the ends of said parallel bars.
Claim 18
Dependent Claim
28 words
The structural combination defined in claim 16, wherein said pin and said spacer bars secure said parallel bars in substantially parallel spaced apart relationship throughout their longitudinal extent.
Claim 19
Dependent Claim
51 words
The structural combination defined in claim 16, wherein each said bar device is longitudinally alignable and removably engageable with substantially identical bar devices upon inter-engagement of the spacer bars of a superior bar device with the intermediate web portion of the pin between said parallel bars of an inferior bar device.
Claim 20
Dependent Claim
50 words
The structural combination defined in claim 15, wherein each said bar device is engageable with and supportable from said support means plate portions by said pin end portions, said parallel bars extending through said medial plate portion notch or said combination notch at the proximal corners of adjacent plate portions.
Claim 21
Dependent Claim
85 words
The structural combination defined in claim 15, wherein said free-floating tile engaging clip comprises a distal member removably engageable with at least one said tile at its upper end, a stem having one end thereof secured to said distal member and extending axially normal to the plane of said distal member, and a bar device 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 22
Dependent Claim
97 words
The structural combination defined in claim 20, wherein said stem and said bar device engaging member each have a cross-sectional thickness no greater than the free clear distance between said bar device parallel bars, said bar device engaging member having a transverse width substantially greater than such free clear distance between said bar device parallel bars, whereby the proximal portion of said stem and said bar device engaging member are insertable between said parallel bars and, upon rotation of said stem and bar device engaging member, said free-floating tile retaining means is engaged with said parallel bars.
Claim 23
Dependent Claim
37 words
The structural combiNation defined in claim 21, wherein said bar device engaging member is planar and, when rotated into engagement with said parallel bars, lies in a plane substantially normal to the axis of said bar device.
Claim 24
Dependent Claim
19 words
The structural combination defined in claim 1, wherein each said tile comprises a unitary ceramic body of silicon carbide.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |