US3760774A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boiler having gas-tight welded furnace walls
Assignee: Kraftwerk Union AG
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Filing: 1971-11-15
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Granted: 1973-09-25
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Expires: 1991-11-15
Abstract
Abstract A boiler mounted on a supporting frame structure has gas-tight welded furnace walls suspended at the top of the frame structure and arranged to form a furnace of rectangular cross-section wherein heat is generated when the boiler is operating. A member is connected to the walls and introduces a discontinuity therein. A plurality of horizontal bands surrounding the walls to take up the expansion and contraction forces developed therein because of the heat generated in the furnace and each of the horizontal bands consist of four segments connected one with the other to form a substantially rectangular figure, the segments being rigidly joined at their ends to form the corners of the figure. At least one additional band is disposed in the upper region of the member and a holding means connects the furnace walls to the additional band at the corners thereof so as to cause the walls to take up the portion of the forces acting in the region of the member. A force transfer means is connected between the plurality of bands and the furnace walls for guiding the boiler body in the plurality of bands so as to pretension the walls of the furnace so as to cause the walls to define obtuse angles at the corners of the furnace when there is no heat being developed therein, the angles being selected so as to cause the angles to become right angles as well as to cause the walls to extend parallel to adjacent band segments when the furnace is heated.
Inventors
- 👤 R Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:54
CPC Classifications
F; F22; F22B; F22B37/00; F22B37/02; F22B37/10; F22B37/14; F22B37/146; F22B37/20; F22B37/208; F22B37/24
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
267 words
A boiler assembly comprising a supporting frame structure, a boiler mounted on said frame structure and comprising gas-tight welded furnace walls, means suspending said walls at the top of the frame structure, said walls being arranged to form a furnace of a rectangular cross-section wherein means are provided for generating heat when the boiler is operating, a member connected to said walls and introducing a discontinuity therein, a plurality of horizontal bands surrounding said walls to take up the expansion and contraction forces developed therein because of the heat generated in the furnace, each of said horizontal bands consisting of four segments connected one with the other to form a substantially rectangular figure, said segments being rigidly joined at their ends to form the corners of said figure, at least one additional band being disposed in the region of said member, holding means connected to said furnace walls and to said one band at the corners thereof so as to causE said walls to take up the portion of said forces acting in the region of said member, force transfer means connected between said plurality of bands and said furnace walls for guiding the boiler body in said plurality of bands so as to pretension said walls of said furnace so as to cause said walls to define obtuse angles at the corners of said furnace when there is no heat being developed therein, said angles being selected so as to cause said angles to become right angles as well as to cause said walls to extend parallel to adjacent band segments when said furnace is heated.
Claim 2
Dependent Claim
267 words
A boiler assembly comprising a supporting frame structure, a boiler mounted on said frame structure and comprising gas-tight welded furnace walls, means suspending said walls at the top of the frame structure, said walls being arranged to form a furnace of a rectangular cross-section wherein means are provided for generating heat when the boiler is operating, a member connected to said walls and introducing a discontinuity therein, a plurality of horizontal bands surrounding said walls to take up the expansion and contraction forces developed therein because of the heat generated in the furnace, each of said horizontal bands consisting of four segments connected one with the other to form a substantially rectangular figure, said segments being rigidly joined at their ends to form the corners of said figure, at least one additional band being disposed in the region of said member, holding means connected to said furnace walls and to said one band at the corners thereof so as to causE said walls to take up the portion of said forces acting in the region of said member, force transfer means connected between said plurality of bands and said furnace walls for guiding the boiler body in said plurality of bands so as to pretension said walls of said furnace so as to cause said walls to define obtuse angles at the corners of said furnace when there is no heat being developed therein, said angles being selected so as to cause said angles to become right angles as well as to cause said walls to extend parallel to adjacent band segments when said furnace is heated.
Claim 3
Dependent Claim
46 words
A boiler assembly according to claim 1, said holding means being movable intermediate members and said force transfer means being a plurality of sets of articulate arms, the arms of each set being connected between corresponding bands of said plurality of bands and said furnace walls.
Claim 4
Dependent Claim
13 words
A boiler assembly according to claim 1, said holding means being hinged arms.
Claim 5
Dependent Claim
28 words
A boiler assembly according to claim 1, comprising tie rods disposed behind said walls and connected to said holding means for taking up said portion of said forces.
Claim 6
Dependent Claim
41 words
A boiler assembly according to claim 1, comprising tubular tie rods disposed behind said walls and connected to said holding means for taking up said portion of said forces, and means communicating with said tubular tie rods for passing steam therethrough.
Claim 7
Dependent Claim
60 words
A boiler assembly according to claim 1, said one additional band consisting of four segments arranged to form a substantially rectangular figure and being open at the corners of said figure, said holding means comprising articulate arms connecting said segments at the respective corners of said figure to cause said furnace walls to take up said portion of said forces.
Claim 8
Dependent Claim
135 words
A boiler assembly according to claim 1, said force transfer means comprising sets of articulated arms connecting respective ones of said plurality of bands with said furnace walls at the region of the corners of said furnace so as to maintain a spacing between said walls and said plurality of bands, said articulated arms being mounted at a distance from one to two meters from said corners of said furnace, each of said articulated arms forming an angle such that said walls of said furnace are pretensioned to cause mutually abutting ones of said walls to define obtuse angles in the cold condition of said furnace, said obtuse angles be selected such that the forces developed in said walls in response to heat generated in said furnace causes said obtuse angles to become right angles.
Claim 9
Dependent Claim
180 words
A boiler assembly according to claim 1, said member being a furnace hopper of rectangular section, an additional plurality of horizontal bands surrounding and reinforcing said hopper, each of said bands of said additional plurality of bands consisting of four segments connected one with the other to form a rectangular figure, said segments being rigidly joined at their ends to form the corners of said last-mentioned figure, said furnace hopper having outer walls joined together to define respective corners thereof, said hopper having a welded tube wall disposed therein, said walls of said hopper being joined so as to impart thereto a pretensioning which causes said hopper to bend at the corners thereof with heat so as to accommodate the thermal expansion of said tube wall, said walls of said hopper defining an opening slit at the bottom of said hopper, said walls being pretensioned in the region of said slit to take up the vertical difference expansion of said walls so as to cause the edges of said slit to form parallel straight lines when said hopper becomes heated.
Claim 10
Dependent Claim
101 words
A boiler assembly according to claim 1 wherein said boiler is a single-flue boiler comprising a furnace portion, having vertical walls, convection heat surface means disposed above said furnace portion, and an additional plurality of horizontal bands surrounding said heat surface means, said last-mentioned bands being frame-like and rigid, said heat surface means being welded to Said vertical walls of said furnace portion, said heat surface means comprising inlet and outlet collectors, said collectors being subdivided at the regions of the corners of said additional plurality of horizontal bands so as to accommodate the heat expansion of said heat surface means.
Claim 11
Dependent Claim
40 words
A boiler assembly according to claim 1 wherein said furnace is driven at underpressure and wherein said furnace comprises convection heat surface means, stuffing boxes mounted in the walls of said furnace for slidably passing said heat surface means therethrough.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |