US3259109A - Tubing - Google Patents

Tubing Download PDF

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Publication number
US3259109A
US3259109A US360634A US36063464A US3259109A US 3259109 A US3259109 A US 3259109A US 360634 A US360634 A US 360634A US 36063464 A US36063464 A US 36063464A US 3259109 A US3259109 A US 3259109A
Authority
US
United States
Prior art keywords
section
tubing
tube section
tube
heating surface
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
US360634A
Other languages
English (en)
Inventor
Grasme Paul
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.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Application granted granted Critical
Publication of US3259109A publication Critical patent/US3259109A/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
    • F22B37/101—Tubes having fins or ribs
    • F22B37/102—Walls built-up from finned tubes
    • 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
    • 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
    • F22B37/16—Return bends

Definitions

  • the present invention relates to tubing, and, more particularly, to a pre-formed curved tubular piece for use in meander-shaped composite tubing which itself is used in conjunction with the surfaces in boilers.
  • the heating surfaces in the combustion chamber as well as in the actual heating chamber of forced-circulation boilers used with refining furnaces are frequency constituted by meander-shaped tubes.
  • the tubes lie close to each other in the combustion chamber or firing box and, in order to prevent the liquid slag from coming into contact with the material in which the tubes are embedded, the latter are additionally provided with spikes or pins and are lined with tamped material.
  • spikes or pins are additionally provided with spikes or pins and are lined with tamped material.
  • the primary object of the present invention to provide a way in which the above-described drawbacks are overcome and this, according to the present invention, is accomplished by letting the tubular connecting pieces which are in the shape of curved sections and which, at each end region, are of generally circular cross section, have a flat elliptical cross section in the region of maximum curvature, generally the middle of the section.
  • the transition of the cross section of the curved tube section, from end region to region of maximum curvature to end region, is continuous.
  • the tube sections are disposed uniformly on the heating surface of the boiler with which the tubing associated, the size of the curved tube sections being such that the uncovered portion of the heating surface is maintained substantially constant between straight and bentportions of the tubing so as to provide uniform cooling of the heating surface.
  • FIGURE 1 shows one embodiment of a tube section according to the present invention.
  • FIGURE 2 is a sectional view taken on line 22 of FIGURE 1.
  • FIGURE 3 shows another embodiment of a tube section according to the present invention.
  • FIGURE 4 is a sectional view taken on line 4-4 of FIGURE 3.
  • FIGURE 5 shows the arrangement of tubing incorporating curved tube sections according to the present invention, this tubing being shown as positioned on a heating surface of a boiler.
  • FIGURE 6 shows a similar arrangement of tubing which is constructed according to the prior art, i.e., the tubing shown in FIGURE 6 lacks the curved tube section according to the present invention.
  • FIG. 1 show a curved tube section 10 which is constituted by two pre-formed shells 10a and 10b, the same being welded to each other, as shown at 12, to form the complete tube section.
  • the tube section has, at each of its end regions a, a generally circular cross section, whereat the tube section is welded, as shown at 22, to another tube section 20 which has a similarly configured end region but which may extend, throughout its length, in any manner to give the tubing as a whole the desired meandering path.
  • the tube section 10 is shown as having, in approximately its middle, a region of maximum curvature b, which, as best shown in FIGURE 2, is .of substantially elliptical cross section.
  • the major axis m of the elliptical cross section extends in the plane in which the tube section curves, i.e., the plane of the drawing of FIGURE 1.
  • the transition of the cross section, from end region a to region of maximum curvature b to end region a, is continuous.
  • each of the shells 10a, 10b has a wall thickness which, when the shells are welded together to form the complete tube section, imparts this predetermined rigidity to the complete tube section.
  • the curved tube section is made up of shells 100a and 100b, welded together by welds 112, the shell 100b being provided with an an integral fin 101 which extends, generally, in the direction of the major axis m of the elliptical cross section. In this way, coverage is provided for the wall surface area immediately adjacent to the wall surface covered by the hollow tubing proper.
  • FIGURE 5 shows meander-shaped tubing which, in accordance with the present invention, includes curved tube sections of the type shown in FIGURES 1 through 4, while FIGURE 6 shows meander-shaped tubing 200 which lacks the tube sections according to the present invention.
  • the meander-shaped tubing is, in each case, illustrated as being positioned over the heating surface H of a boiler. It will be appreciated from a comparison of FIGURES 5 and 6 that the tubing incorporating the sections according to the present invention provides a substantially complete coverage of all portions of the heating surface, even at a place where several tube sections come together, while the uncovered portion of the heating surface is maintained substantially constant between straight and bent portions of the tubing, which itself is disposed uniformly on the heating surface, so as to provide uniform cooling of the heating surface.
  • a boiler having a heating surface; and meander-shaped tubing associated with said heating surface, said tubing incorporating a plurality of tube sections, at least some of said tube sections being curved, each of said curved tube sections having, at each end region, a generally circular cross section and, at its region of maximum curvature, a flat ellipitical cross section, the major axis of said elliptical cross section extending in the plane in which the respective tube section curves, the transition of the cross section of each tube section, from end region to region of maximum curvature to end region, being continuous, said tube sections being disposed uniformly on said heating surface and the size of said curved tube sections being such that the uncovered portion of said heating surface is maintained substantially constant between straight and bent portions of said tubing so as to provide uniform cooling of said heating surface.
  • fin means extending generally in the direction of the major axis of said elliptical cross section, thereby to provide coverage for the wall surface area immediately adjacent the wall surface covered by the tubing proper.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Articles (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
US360634A 1963-04-18 1964-04-17 Tubing Expired - Lifetime US3259109A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL0044657 1963-04-18

Publications (1)

Publication Number Publication Date
US3259109A true US3259109A (en) 1966-07-05

Family

ID=7270780

Family Applications (1)

Application Number Title Priority Date Filing Date
US360634A Expired - Lifetime US3259109A (en) 1963-04-18 1964-04-17 Tubing

Country Status (3)

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US (1) US3259109A (de)
CH (1) CH420202A (de)
GB (1) GB1062061A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809016A (en) * 1971-10-29 1974-05-07 Kraftwerk Union Ag Steam generator with flat combustion chamber bottom
US20090260760A1 (en) * 2004-04-30 2009-10-22 The Japan Steel Works, Ltd. Method of molding a hollow molded article, hollow molded article, and apparatus for manufacturing the same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4995645A (en) * 1990-02-20 1991-02-26 General Resource Corporation Elbow connection for pneumatic conveying system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2170342A (en) * 1935-12-18 1939-08-22 Babcock & Wilcox Co Vapor generator
US2562442A (en) * 1946-08-14 1951-07-31 Comb Engnineering Superheater Compact steam generator
US3129698A (en) * 1960-03-18 1964-04-21 Sulzer Ag Forced flow steam generator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2170342A (en) * 1935-12-18 1939-08-22 Babcock & Wilcox Co Vapor generator
US2562442A (en) * 1946-08-14 1951-07-31 Comb Engnineering Superheater Compact steam generator
US3129698A (en) * 1960-03-18 1964-04-21 Sulzer Ag Forced flow steam generator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3809016A (en) * 1971-10-29 1974-05-07 Kraftwerk Union Ag Steam generator with flat combustion chamber bottom
US20090260760A1 (en) * 2004-04-30 2009-10-22 The Japan Steel Works, Ltd. Method of molding a hollow molded article, hollow molded article, and apparatus for manufacturing the same

Also Published As

Publication number Publication date
CH420202A (de) 1966-09-15
GB1062061A (en) 1967-03-15

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