US3744458A - Once-through boiler with suspended tube system - Google Patents

Once-through boiler with suspended tube system Download PDF

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Publication number
US3744458A
US3744458A US00165820A US3744458DA US3744458A US 3744458 A US3744458 A US 3744458A US 00165820 A US00165820 A US 00165820A US 3744458D A US3744458D A US 3744458DA US 3744458 A US3744458 A US 3744458A
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US
United States
Prior art keywords
tubes
support tube
combustion chamber
helical winding
once
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00165820A
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English (en)
Inventor
H Bruckner
W Emsperger
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Kraftwerk Union AG
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Kraftwerk Union AG
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Filing date
Publication date
Application filed by Kraftwerk Union AG filed Critical Kraftwerk Union AG
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Publication of US3744458A publication Critical patent/US3744458A/en
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    • 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
    • F22B37/62—Component parts or details of steam boilers specially adapted for steam boilers of forced-flow type
    • F22B37/64—Mounting of, or supporting arrangements for, tube units
    • F22B37/645—Mounting of, or supporting arrangements for, tube units involving upper vertically-disposed water tubes and lower horizontally- or helically disposed water tubes

Definitions

  • ABSTRACT In a once-through boiler having vaporizer heating surface members, in the form of a tightly welded helical winding of tubes, suspended on unheated downcomer tubes, the helical winding of tubes is fixedly connected only at upper and lower ends thereof to the downcomer tubes, while it is connected slidingly to the downcomer tubes at locations intermediate the fixed connections.
  • the invention relates to once-through boiler of high output with a vaporizer system winding upwardly around the combustion chamber of the boiler, the vaporizer system being formed of a helical winding of tightly welded-together fin tubes or finned tubes which simultaneously form part of the combustion or fire chamber wall.
  • the downcomer or supporting tubes, on which the mutually welded helical winding is suspended, are cooled by the water flowing downwardly therein. Heating of the water in the downcomer tubes should be avoided as a matter of expediency because, otherwise, the downward flow of the medium might be hindered therebyand instabilities in the flow might tend to occur. Furthermore, the downcomer tubes ought not to become too heated, becausev otherwise very great changes in the length thereof would have to be taken into consideration. Accordingly, the supporting downcomer tubes are located outside'and adjacent the fire or combustion chamber wall and are shielded, at least in the vicinity of the helical winding, by the tubes of the vaporizer. I
  • the supporting downcomer tubes are colder than the tube wall of the combustion chamber, the different thermal expansions of the supporting downcomer tubes and the helical winding of tubes forming the combustion chamber wall must be taken into consideration. Moreover, different local temperature differences occur.
  • oncethrough steam boiler comprising a combustion chamber, a vaporizer system formed of a helical winding of tubes welded tightly to one another and extending around the combustion chamber, vertically extending support tube means located adjacent the vaporizer system, the support tube means being downwardly traversible by working medium having a temperature below boiling and means for suspending the vaporizer system from the support tube means, the suspending means comprising respective means located at an upper and a lower part of the helical winding of tubes for fixedly connecting the latter to the support tube means, and a plurality of means located intermediate the respective fixedly connecting means for slidingly'connecting the helical winding of tubes to the support tube means.
  • the fixed connections are force-locking or are welds.
  • the vertical support tubes are disposed about the entire periphery of the combustion chamber and, in accordance with the invention, is provided with a given prestressing.
  • the helical winding of mutually welded tubes is prestressed.
  • the prestressing may be effected, for example, by applying weight loads or screw connections. By means of this prestressing, the stresses caused by the temperature differences can be suitably counteracted.
  • the support tubes are distributed in pairs or individually in suitable spaced relationship, forexample, l to 2m, about. the periphery of the combustion chamber so as to providethe necessary supporting capability.
  • the support tubes When the support tubes are employed in pairs, they can be welded together either along the entire lengths thereof or only at given locations along the lengths thereof so that the helical winding of tubes can be braced at the thus strengthened location-through vertical slide connections.
  • the advantage derived therefrom is that the point of attack of the forces can be located in the neutral fiber of the support tube and thereby avoid moments.
  • the location at which the support tubes are fixedly or force-lockingly connected to the helical winding of tubes at the lower part of the latter is in the vicinity of the upper edge of the combustion chamber funnel, in accordance with a further feature of the invention. Since the support tubes have a lower temperature, during operation of the once-through boiler, than the temperature of the helical winding of tubes, the tubes of the helical winding are increasingly pressed together when the boiler starts operating. This means that a greater part of the weight of the helical winding of tubes is supported in the lower part thereof, for example at the beginning of the combustion chamber funnel, so that a release of tension occurs in the upper part of the helical winding of tubes. How strongly this tension release takes effect during operation of the boiler de pends upon what prestress was applied; weights of several tons, for example, being able to be suspended.
  • FIG. 1 is a sectional view of part of a combustion or fire chamber wall of a once-through boiler with suspended tube system constructed in accordance with the invention.
  • FIG. 2 is an enlarged elevational view, partly broken away, of FIG. 1, as seen from the left-hand side of the latter.
  • a part 1 of a combustion or fire chamber wall which is formed of a helical winding of vaporizing tubes welded together.
  • the vaporizing tubes wind upwardly along the wall of the combustion chamber either only on a single wall or on several walls.
  • the vaporizing tubes I extend horizontally along one or more of the other walls.
  • supporting tubes 2 are formed pairwise of tubes 3 and 4 which are directly welded to one another or are welded to one another through the use of intermediate members such as the members 5 to 8.
  • the intermediate members, such as the members 5, 6 and 8, are given dimensions respectively for a single point of attachment, however, it is also possible to employ longer strips 7 as intermediate members so as to be able to effect fastening of the tubes at several loca tions thereof.
  • only two rigid or fixed connections are provided between the helically wound tubes forming the part 1 of the combustion chamber wall and the support tubes 2, namely, an upper rigid fastening point 9 in the vicinity of the upper end of the vaporizer 1 and a lower rigid fastening point 10 'at the lower end of the vaporizer 1 or at the upper end of the ash hopper or funnel ll of the combustion chamber.
  • the prestressing thereof which is applied before the welding of the lower fixed fastening point to the supporting tubes 2 or the tube wall 1, is of considerable importance.
  • a weight load of several tons can be provided.
  • the combustion chamber wall and the supporting tubes 2 then act, in operational warm condition of the boiler, as a system of two springs coupled to one another, which absorb forces in accordance with their rigidities. In contrast to relieving the weight with constant suspension means,.such construction is simpler and less costly.
  • the ash that is produced distributs itself on the tube wall 1 and the support structure 2 in accordance with their rigidities.
  • the reinforcing or stiffening structure 22 can be suspended from the supporting tubes 2. Since small relative expansion between the tube wall 1 of the combustion chamber and the reinforcing structure accordingly occur, the edge connections of a horizontal reinforcing support can be of especially simple construction. Besides both fixed attachment points 9 and 10, only a slight connection is provided between the tube wall 1 of the combustion chamber and the supporting tubes 2 at the locations 12 to 18. By suitable clamping, the stability of shape or non-deformability of the tube wall 1 of the combustion chamber can be assured with adequate movability of the structural members. As may be readily seen from FIGS. 1 and 2, an intermediate member, such as one of the intermediate members 5 and 8, is provided at the upper and lower ends of the tube wall 1.
  • a circular hole is formed in the intermediate members 5 and 8 through which a clamping bolt is inserted for rigidly securing the tube wall 1 to the supporting tubes 2.
  • the intermediate members 6 and 7, for example, by-which the supporting tubes 3 and 4 are welded together between the uppermost and lowermost intermediate members 5 and 8, are each provided with elongated bolts 19 and 20, 21 respectively, through which one of the bolts or similar fasteners 12 to 17 are inserted so as to slidingly connect the tube wall 1 to the supporting tubes 2.
  • the tube wall 1 is rigidly held at the intermediate members 5 and 8 of FIG. 2, it is displaceable vertically along the slots 19, 20 and 21 of the intermediate members 6 and 7, for example.
  • a once-through steam boiler comprising a combustion chamber, a vaporizer system including a helical winding of tubes welded tightly to one another and extending around said. combustion chamber, vertically extending support tube means located adjacent said vaporizer system, said support tube means beingdownwardly traversible by working medium having a temperature below boiling, and means for suspending said vaporizer system from said support tube means, said suspending means comprising respective means located at an upper and a lower part of said helical winding of tubes for fixedly. connecting, said upper part and said lower part of said helical winding of tubes to an upper part and lower part respectively of said support tube means, and a plurality of means located intermediate said respective fixedly connecting means for slidingly connecting said helical winding of tubes to said support tube means.
  • said support tube means comprises a plurality of tubes secured in pairs to one another, said support tube pairs being spaced apart from each other around the periphery of said combustion chamber.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
US00165820A 1970-07-11 1971-07-08 Once-through boiler with suspended tube system Expired - Lifetime US3744458A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2034464A DE2034464B2 (de) 1970-07-11 1970-07-11 Durchlaufkessel mit aufgehängtem Rohrsystem

Publications (1)

Publication Number Publication Date
US3744458A true US3744458A (en) 1973-07-10

Family

ID=5776468

Family Applications (1)

Application Number Title Priority Date Filing Date
US00165820A Expired - Lifetime US3744458A (en) 1970-07-11 1971-07-08 Once-through boiler with suspended tube system

Country Status (5)

Country Link
US (1) US3744458A (de)
JP (1) JPS5417362B1 (de)
DE (1) DE2034464B2 (de)
FR (1) FR2101556A5 (de)
GB (1) GB1311376A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4123994A (en) * 1976-05-13 1978-11-07 Balcke-Durr Aktiengesellschaft Apparatus for suspension of a tube wall
JPS54116501A (en) * 1977-12-16 1979-09-10 Foster Wheeler Corp Inclined branch type water tube boiler
US4175519A (en) * 1978-03-31 1979-11-27 Foster Wheeler Energy Corporation Vapor generator utilizing vertical bars for supporting angularly arranged furnace boundary wall fluid flow tubes

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH634905A5 (de) * 1978-12-20 1983-02-28 Sulzer Ag Dampferzeugerwand.

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4123994A (en) * 1976-05-13 1978-11-07 Balcke-Durr Aktiengesellschaft Apparatus for suspension of a tube wall
JPS54116501A (en) * 1977-12-16 1979-09-10 Foster Wheeler Corp Inclined branch type water tube boiler
US4178881A (en) * 1977-12-16 1979-12-18 Foster Wheeler Energy Corporation Vapor generating system utilizing angularly arranged bifurcated furnace boundary wall fluid flow tubes
JPS5943681B2 (ja) * 1977-12-16 1984-10-24 フオスタ−・ホイ−ラ−・エナジ−・コ−ポレ−シヨン 傾斜分岐式水管ボイラ
US4175519A (en) * 1978-03-31 1979-11-27 Foster Wheeler Energy Corporation Vapor generator utilizing vertical bars for supporting angularly arranged furnace boundary wall fluid flow tubes

Also Published As

Publication number Publication date
FR2101556A5 (de) 1972-03-31
DE2034464B2 (de) 1975-10-30
DE2034464A1 (de) 1972-01-20
GB1311376A (en) 1973-03-28
JPS5417362B1 (de) 1979-06-29

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