US3301226A - Support for roof tubes of a fluid heater - Google Patents

Support for roof tubes of a fluid heater Download PDF

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Publication number
US3301226A
US3301226A US475202A US47520265A US3301226A US 3301226 A US3301226 A US 3301226A US 475202 A US475202 A US 475202A US 47520265 A US47520265 A US 47520265A US 3301226 A US3301226 A US 3301226A
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US
United States
Prior art keywords
tubes
roof
lug
gas
tube
Prior art date
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
Application number
US475202A
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English (en)
Inventor
Konrad S Svendsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Combustion Engineering Inc
Original Assignee
Combustion Engineering Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Combustion Engineering Inc filed Critical Combustion Engineering Inc
Priority to US475202A priority Critical patent/US3301226A/en
Priority to BR179518/66A priority patent/BR6679518D0/pt
Priority to GB22293/66A priority patent/GB1125473A/en
Priority to BE681592D priority patent/BE681592A/xx
Priority to NL6607308A priority patent/NL6607308A/xx
Priority to SE7285/66A priority patent/SE315293B/xx
Priority to ES0327287A priority patent/ES327287A1/es
Priority to DEC39210A priority patent/DE1280260B/de
Application granted granted Critical
Publication of US3301226A publication Critical patent/US3301226A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/14—Supply mains, e.g. rising mains, down-comers, in connection with water tubes
    • F22B37/148—Tube arrangements for the roofs
    • 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
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/20—Supporting arrangements, e.g. for securing water-tube sets

Definitions

  • FIG. 1 A first figure.
  • This invention relates to tube supports and in particular to an apparatus for supporting generally horizontal roof tubes of a fluid heater such as a steam generator.
  • Fluid heaters such as steam generators which are fired with a fossil fuel have gas passages for conveying the combustion products away from the combustion zone.
  • These passages in most of the large units have walls lined with water or steam cooled tubes to avoid problems that occur with the use of high temperature refractory and to provide additional heat absorbing surface.
  • These gas passages also have tubes lining the roof of the passages.
  • a gas-tight seal must be provided. This is generally accomplished by locating a skin casing on the outside of the roof tubes.
  • This skin casing is a thin metallic plate which is formed at its edges to incorporate flexibility thereby absorbing differential expansion between the heavy framing when the skin casing expands to a temperature approximating that of the tubes.
  • the heavy steel framing for the steam generator .expands at varying degrees depending on the temperature of the particular member.
  • the tubes expand according to their own temperature which is a function of both the temperature of the fluid passing through the tube and the temperatureof the gases to which they are exposed. While the tubes are supported from this steel framing, they must be supported in such a way that the differential expansion is permitted.
  • considerable temperature difference can occur bet-ween the various tubes in the roof due to the different temperatures of the fluids passing through the various tubes. In such a situation these tubes must be either securely welded together so that the stresses are locked in the tubes or permitted to expand with respect to one another.
  • this temperature difference is quite high, the solution of welding these tubes together is untenable because of the high stresses developed and accordingly the only practical solution is to permit the tubes to expand with respect to one another.
  • the invention comprises an arrangement, construction and combination of the elements of the inventive organization in such a manner as to attain the results desired, as hereinafter more particularly set forth in the following detailed description of illustrative embodiments.
  • FIGURE 1 is a sectional side elevation through a support system wherein an inverted channel is used as a support member;
  • FIGURE 2 is a sectional elevation through 2-2 of FIGURE 1;
  • FIGURE 3 is a sectional elevation of a roof support employed in conjunction with a support for superheater elements
  • FIGURE 4 is a sectional plan view taken through section 4-4 of FIGURE 3.
  • the steam generator has on the roof of the gas passageway .a plurality of roof tubes 2 which are generally horizontal and are parallel throughout the relevant portion of their length. These tubes must be supported to avoid sagging into the passage-way and also bucked from the top to prevent the tubes from lifting upwardly in the event of pressure within the passageway.
  • the steam generator structure generally includes support steel which passes a distance about 12 to 18 feet over the roof of the furnace. The tubing is essentially supported from this building steel.
  • a U-shaped support lug 5 is welded to the roof tube.
  • This U-shaped lug is formed of a 7 inch plate inch wide and is bent so that its width is 1 /2 inch over-all while depth from the upper side of the roof tube 2 to the lower side of the upper surface of the lug is 1 inch.
  • This lug is welded so that the legs are on either side of the tube center line.
  • inch by inch bars 7 are welded to the lower edge of the inverted channel 4 after being placed so that they pass through the lug 5. The lug 5 then rests in sliding contact with the bar 7 with the passageway roof tube 2 being the tubes so that it tends to adopt the temperature of the tubes.
  • End flanges 9 of the skin casing are bent upwardly at a sharp angle and welded to the inverted channel 4.
  • a gas-tight seal is thus formed by this skin casing in conjunction with the inverted channel 4.
  • a refractory insulation 10 is placed on top of the tubes underneath the skin casing with this refractory being applied 3 so that it does not extend above the upper surface of the tubes. timate contact with the tube 2 while preventing excessive access to the skincasing by the hot gases flowing through the passageway below.
  • the skin casing will form a structural member which resists upward movement of the tubes.
  • the upward forces from the tubes as well as the gas pressure against the skin casing is transmitted into the channel 4 and then through the support rod 3 which has suflicient stiffness to resist the nominal forces which occur due to gas pressure within the passageway.
  • FIGURES l and 2 The embodiment of FIGURES l and 2 is used in areas where there is no other heating surface to be supported in the general area. In steam generators, however, steam superheating surface is frequently suspended in the gas passageway. A support for such heating surface is illustrated in FIGURE 3.
  • the steam superheating tubes '12 which extend downwardly to form the steam superheating surface are supported through a high crown seal which includes inverted U-shaped' channels 13 through which the tubes pass. These channels are extended and welded to fiat roof bars 14 which run transverse to the roof tubes 2.
  • the sealing arrangement which, supports the'sujgierheater elements and is located between the two roof bars 14 is a gas-tight arrangement which is known as a high crown furnace seal.
  • FIGURES 3 and'4 illustratefthe use of my invention in conjunctionwitlisuch a high crown seal. i
  • the roof bars of the high crown seal are supported by support rods 15 which extend upwardly and are secured to the building steel overhead. These rods are of sufficient strength to carry the weight of the sup'erheaterassemblies as well as the weight of the roof.
  • the weight of the individual roof tubes is thrown into the roof bar 14 through an elongated U-shaped lug 17.
  • the operative portion of this lug insofar as support of thetube is concerned is only the lower leg of the lug. -However, the upper portion of the lug is retained so that it may be welded. to the roof bar 14 at this upper edge thereby forming a welded joint which has a sufficient moment to avoid excessive stresses at'the weld. 1
  • U-lugs 5 are welded to the roof. tubes 2 in the same manner as described in the previous embodiment. These tubes vare then drawn up so that the upper edge of the tube touches the lower edge .ofthe roof lug 14. The elongated support bar 17 is then slipped through the bar 5 as illustrated and drawn upwardly so that it bears against the upper edge of the lug 5.. While being held in this location this lug is then welded to the roof bar 14.
  • the skin casing 8 is placed against the roof tubes 2 and bent upwardly around the support arrangement so that it may be welded through flange 19 to the roof bar 14.
  • the skin casing is not operative to hold the roof tubes down, however the roof bar 14 This permits the skin casing 8 to come in inbeing placed in contact with the roof tubes 2 is the memher which resists upward movement of the roof tubes.
  • an apparatus for supporting said tubes comprising: a U-shaped lug welded on each supported tube with the axis of the center line through the opening of the lug being parallel with the tube and the legs of the U-lug pointing downward; a bar parallel to the supported tube and above the tube extending through the U-lug in sliding contact with the inner edge of the top of the U-lug; a horizontal rigid imperforate support member running transverse the tubes and supporting said bars from the lower edge of said member; and a skin casing of thin metal immediately adjacent the upper surface of said roof tubes and having the edges bent upwardly and welded to said support member above the lower edge of said member, so that said skin casing and support member form a generally gas-tight seal with the bar being supported from said member on the gas flow passage side of the gas-tight seal.
  • an apparatus for supporting said tube comprising; a U-lug welded to the upper portion of the supported tubes with the center line through the opening of the lug extending parallel to the tubes; 2.
  • a fluid heater having aheating gas flow passage and generally horizontal: and parallel. roof tubes for conveying the fiuid being heated, said roof tubes comprising the. roof of the gas passage, an apparatus for supporting said tubes comprising: a U-lug welded to the upper'portion of each of the supported tubes with the center line through the opening of the lug extending parallel to the tube; building steel for supporting the fluid heater; an inverted imperforate channel located directly above said roof tubes and running transversely to said roof tubes; means for supporting said channel from said building steel; skin casing of thin metal adjacent the upper surface of said roof tubes and being bent upwardly at the edges forming a flange with said flange being welded to said channel, whereby said skin casing and said channel form a gas-tight seal; bars secured to the lower flanges of said channel passing through said U-lugs and being in sliding contact with the upper edge of said U-lugs; and said skin casing beingwelded to said channel so that said flange operates to restrain upward movement of said roof tubes relative
  • a fiuid heater having a heating gas flow passage and generally horizontal and parallel root tubes comprising the roof of said gas passage an apparatus for supporting said tubes comprising: a U-lug welded to the upper half of each of the supported tubes with the center line through the opening of the lug extending parallel to the tube; a flat bar extending vertically from said roof tubes and running transverse to said roof tubes located directly above said roof tubes; horizontal support members extending outwardly from said fiat bar with said support members passing through said U-lugs and being in sliding contact with the upper inner surface of said U-lugs; a gas-tight skin casing in contact with the upper surface of said tubes and passing upwardly over said U- lugs and support means and being welded to said fiat bar to enclose said support means and U-lugs within the gas passage side of said gas-tight enclosure.
  • an apparatus for supporting said roof tube comprising: a U-lug welded to the upper half of each of the supported tubes with the center line through the opening of the lug extending parallel to the tubes; horizontal tube support means extending outwardly from one of said fiat bars directly above each of said supported tubes in a direction parallel to the tube, said bar extending through the U-lug and being in sliding contact with the inner surface of the top of said U-lug; means for supporting said superheater element structure; gas-tight enclosure comprising a skin casing of thin metal in contact with the upper edge of said roof tubes and passing upwardly over said

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supports For Pipes And Cables (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
US475202A 1965-07-27 1965-07-27 Support for roof tubes of a fluid heater Expired - Lifetime US3301226A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US475202A US3301226A (en) 1965-07-27 1965-07-27 Support for roof tubes of a fluid heater
BR179518/66A BR6679518D0 (pt) 1965-07-27 1966-05-17 Apoio para tubos de teto de um aquecedor de fluido
GB22293/66A GB1125473A (en) 1965-07-27 1966-05-19 Support structure for generally horizontal tubes
BE681592D BE681592A (fi) 1965-07-27 1966-05-25
NL6607308A NL6607308A (fi) 1965-07-27 1966-05-26
SE7285/66A SE315293B (fi) 1965-07-27 1966-05-27
ES0327287A ES327287A1 (es) 1965-07-27 1966-05-28 Una disposicion estructural de soporte de tubos generalmente horizontales.
DEC39210A DE1280260B (de) 1965-07-27 1966-05-31 Halterung fuer annaehernd horizontale Rohre, insbesondere zur Aufhaengung der Deckenrohre in einem Dampferzeuger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US475202A US3301226A (en) 1965-07-27 1965-07-27 Support for roof tubes of a fluid heater

Publications (1)

Publication Number Publication Date
US3301226A true US3301226A (en) 1967-01-31

Family

ID=23886621

Family Applications (1)

Application Number Title Priority Date Filing Date
US475202A Expired - Lifetime US3301226A (en) 1965-07-27 1965-07-27 Support for roof tubes of a fluid heater

Country Status (8)

Country Link
US (1) US3301226A (fi)
BE (1) BE681592A (fi)
BR (1) BR6679518D0 (fi)
DE (1) DE1280260B (fi)
ES (1) ES327287A1 (fi)
GB (1) GB1125473A (fi)
NL (1) NL6607308A (fi)
SE (1) SE315293B (fi)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3444841A (en) * 1967-10-11 1969-05-20 Foster Wheeler Corp Vapor generator seal arrangement
US3645238A (en) * 1970-10-19 1972-02-29 Combustion Eng Flexible seal between roof and sidewalls of a steam generator furnace
CN102393008A (zh) * 2011-03-30 2012-03-28 上海锅炉厂有限公司 一种锅炉管排悬吊装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2241966A (en) * 1938-08-17 1941-05-13 Gen Electric Mercury boiler
US2515443A (en) * 1944-11-16 1950-07-18 Babcock & Wilcox Co Vapor generator
US2757649A (en) * 1952-09-09 1956-08-07 Babcock & Wilcox Co Fluid heater with guided convection elements

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB384957A (en) * 1931-08-14 1932-12-15 Superheater Co Ltd Improvements in or relating to means for supporting pipes comprised in steam superheater or like elements

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2241966A (en) * 1938-08-17 1941-05-13 Gen Electric Mercury boiler
US2515443A (en) * 1944-11-16 1950-07-18 Babcock & Wilcox Co Vapor generator
US2757649A (en) * 1952-09-09 1956-08-07 Babcock & Wilcox Co Fluid heater with guided convection elements

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3444841A (en) * 1967-10-11 1969-05-20 Foster Wheeler Corp Vapor generator seal arrangement
US3645238A (en) * 1970-10-19 1972-02-29 Combustion Eng Flexible seal between roof and sidewalls of a steam generator furnace
CN102393008A (zh) * 2011-03-30 2012-03-28 上海锅炉厂有限公司 一种锅炉管排悬吊装置
CN102393008B (zh) * 2011-03-30 2013-08-21 上海锅炉厂有限公司 一种锅炉管排悬吊装置

Also Published As

Publication number Publication date
DE1280260B (de) 1968-10-17
ES327287A1 (es) 1967-07-16
NL6607308A (fi) 1967-01-30
SE315293B (fi) 1969-09-29
BR6679518D0 (pt) 1973-06-14
BE681592A (fi) 1966-11-25
GB1125473A (en) 1968-08-28

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