US3312199A - Drum rocking support for carrying heavy loads - Google Patents

Drum rocking support for carrying heavy loads Download PDF

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Publication number
US3312199A
US3312199A US513803A US51380365A US3312199A US 3312199 A US3312199 A US 3312199A US 513803 A US513803 A US 513803A US 51380365 A US51380365 A US 51380365A US 3312199 A US3312199 A US 3312199A
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US
United States
Prior art keywords
vessel
drum
contact
contact surface
support
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
US513803A
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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 US513803A priority Critical patent/US3312199A/en
Priority to ES0333164A priority patent/ES333164A1/es
Priority to BE689999D priority patent/BE689999A/xx
Priority to FR84342A priority patent/FR1501384A/fr
Priority to NL6616647A priority patent/NL6616647A/xx
Application granted granted Critical
Publication of US3312199A publication Critical patent/US3312199A/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
    • F22B37/20—Supporting arrangements, e.g. for securing water-tube sets
    • F22B37/207—Supporting arrangements for drums and collectors

Definitions

  • the invention relates to steam boilers which are suspended from a steel structure, and is more particularly concerned with supporting, by means of rocker chairs, a portion of the boiler including the steam and water drum and the tubes connected thereto, as well as other equipment attached to the tubes such as the boiler casing.
  • a common method of supporting the boiler consists in suspending it from an overhead steel structure by means of drum hangers such as those disclosed in US. application Ser. No. 345,611, now Patent No. 3,263,656, filed Feb. 18, 1964, by John Kurek, I r. Because of a displacement of the drum of several inches and because of the heavy load carried by the drum hangers, such hangers must not only have a large cross sectional area, but must also be of substantial length to provide flexibility so as to prevent the resulting tensional and bending stresses from exceeding established safe limits. Thus, in large boilers generating more than one million pounds of steam per hour the overhead steel beams may be at an elevation of thirty to forty feet above the drum elevation. This requires that the boiler columns as well as the building columns roof and side Walls of the building must be extended a substantial distance above the drum elevation, which adds a considerable amount to the cost of the boiler and building structure.
  • the present invention overcomes the above problems by the use of a rocking support structure having one end thereof formed in the manner of a large diameter roller for rocking contact, and having the other end thereof organized in the manner of a fixed bearing for sliding and oscillating contact.
  • Another object of the invention is to significantly reduce the overhead steel structure and building height when faced with the problem of supporting large boilers operating at high pressure and high temperature.
  • a further object of the invention is to provide a rocking drum support to carry extremely large loads wherein one end of the rocker is designed for rolling contact and the other end for sliding and oscillating contact.
  • a still further object of the invention is to eliminate the cost of special supports ordinarily required to oppose lateral forces caused by earthquake and Windstorm.
  • FIG. 1 is a partial elevational cross section of a steam generator equipped with the herein disclosed support structure
  • FIG. 2 is a plan View of the steam drum and steel structure, showing the direction in which the drum ends move due to thermal expansion;
  • FIG. 3 is an enlarged elevational view of the cradle and rocker support of the drum
  • FIG. 4 is a plan section of the cradle and rocker when taken on line 44, of FIG. 3;
  • FIG. 5 is an elevational view of the cradle and rocker support of FIG. 4 when taken on line 5-5 thereof;
  • FIG. 6 is a side view when taken on line 6-6 of FIG.
  • FIGS. 7 and 8 are side views of the rocker support similar to FIG. 6, with FIG. 7 showing the rocker in the cold position and FIG. 8 in the hot position;
  • FIGS. 9, 10 and 11 are side views of three other designs of the herein disclosed rocker support.
  • the illustrative and preferred embodiment of the inven generator designated generally as 10 and comprising a furnace chamber 12 lined with heat absorbing tubes 14, and
  • roof tubes 16 which terminate in a steam and water drum l8.
  • This drum is supported from structural steel 20 by means of a pair of cradle and rocker supports 22, one at each end 24 of drum 18 as shown in FIG. 2.
  • the steam generator is restrained by the surrounding steel work in such a manner that a fixed point 25 of zero horizontal expansion is established which point preferably is located approximately midway between front and rear of the boiler and at the center line 26 thereof In a top supported steam generator such as that i1- lustratively depicted in FIG. 1 a major portion of the vertical thermal expansion occurs downwardly from the center of drum 18.
  • Thermal horizontal expansion of the tubes such as roof tubes 16 proceeds from point 25 toward drum 18, and thermal horizontal expansion of the drum proceeds from center line 26 toward each end 24 of drum 18, with the center of drum 18 slideably being anchored at 27.
  • the resultant direction of expansion for displacement of drum ends 24 accordingly takes place along lines 3 28 and away from point 25, the point of zero expansion as indicated in FIG. 2.
  • the drum support comprises a cradle 30 built up of structural steel members 31 and preferably welded to drum 18.
  • Cradle 3t includes a horizontal base plate 32 having a smooth lower surface 33. As more clearly shown in FIGS. 5 and 6, this surface is in rolling contact with the outer surface at one end of a rounded member such as a large diameter cylindrical section 34. The other end of member 34 is organized for sliding and oscillating contact by being provided with a cylindrical, concave bearing surface matching the upper contact surface of a bearing shaft 38.
  • each drum cradle 30 As indicated in FIGS. 3 and .4, two rocker assemblies are provided for each drum cradle 30.
  • the bearing shaft 38 of each rocker is supported by and attached to a supporting plate 40 which may be an integral part of steel structure 20.
  • a self-lubricating bearing insert 44 is provided of the type generally known as a lubrite bearing.
  • This bearing will further reduce any lateral forces exerted on the steel structure due to thermal expansion.
  • FIGS. 7 and 8 show the rocker support in the cold and the hot position, respectively, with distance 46 representing the amount of displacement of each drum end due to expansion.
  • FIG. 9 shows a design of the herein disclosed rocking support similar to FIG. 6, but with the contact surfaces reversed.
  • the sliding and oscillating contact surfaces is at the top end, and the rolling contact surface at the bottom end of the rocking member.
  • FIGS. 10 and 11 show designs similar to FIGS. 9 and 6, respectively, however, whereas in the designs illustrated in FIGS. 6 and 9 the sliding and oscillating ends of member 34 have a concave shape, those of the designs illustrated in FIGS. 10 and 11 have a convex shape.
  • an elongated vessel a structure fixedly attached to said vessel and extending laterally [therefrom with respect to the longitudinal axis of said vessel, means exposing said structure and said vessel to heat causing thermal expansion forces to move said vessel in a direction which lies in the horizontal plane passing through the longitudinal axis of said vessel and is at an acute angle with respect to said longitudinal axis; a first contact surface integral with the underside of said vessel; a fixed support below said vessel and spaced therefrom, including a second contact surface facing said first contact surface; rocking means between said vessel and said fixed support for transferring the weight of said vessel onto said fixed support; one end of said rocking means having a first curvature being organized for rolling contact with one of said first and second contact surfaces; the other end of said rocking means having a second curvature being organized for sliding and oscil lating contact with the other of said first and second contact surfaces; and said second contact surface having a threedimensional support area inversely matching said second curvature.
  • said first contact surface comprises a concave surface and said other end of said rocking means a convex surface matching said concave surface.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vibration Prevention Devices (AREA)
  • Supports For Pipes And Cables (AREA)
US513803A 1965-12-14 1965-12-14 Drum rocking support for carrying heavy loads Expired - Lifetime US3312199A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US513803A US3312199A (en) 1965-12-14 1965-12-14 Drum rocking support for carrying heavy loads
ES0333164A ES333164A1 (es) 1965-12-14 1966-11-08 Un dispositivo de soporte basculante.
BE689999D BE689999A (fr) 1965-12-14 1966-11-21
FR84342A FR1501384A (fr) 1965-12-14 1966-11-21 Structure porteuse oscillante notamment pour chaudière à vapeur
NL6616647A NL6616647A (fr) 1965-12-14 1966-11-25

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US513803A US3312199A (en) 1965-12-14 1965-12-14 Drum rocking support for carrying heavy loads

Publications (1)

Publication Number Publication Date
US3312199A true US3312199A (en) 1967-04-04

Family

ID=24044734

Family Applications (1)

Application Number Title Priority Date Filing Date
US513803A Expired - Lifetime US3312199A (en) 1965-12-14 1965-12-14 Drum rocking support for carrying heavy loads

Country Status (5)

Country Link
US (1) US3312199A (fr)
BE (1) BE689999A (fr)
ES (1) ES333164A1 (fr)
FR (1) FR1501384A (fr)
NL (1) NL6616647A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3439653A (en) * 1967-10-11 1969-04-22 Foster Wheeler Corp Header system
US3554168A (en) * 1968-10-17 1971-01-12 Stone & Webster Eng Corp Furnace apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US652075A (en) * 1900-03-14 1900-06-19 John Calvin Black Boiler-setting.
US1634084A (en) * 1922-10-25 1927-06-28 Vaporackumulator Ab Support
DE514597C (de) * 1930-12-15 Ruthsaccumulator A B Auflagerung fuer Kesselkoerper, insbesondere Waermespeicher

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE514597C (de) * 1930-12-15 Ruthsaccumulator A B Auflagerung fuer Kesselkoerper, insbesondere Waermespeicher
US652075A (en) * 1900-03-14 1900-06-19 John Calvin Black Boiler-setting.
US1634084A (en) * 1922-10-25 1927-06-28 Vaporackumulator Ab Support

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3439653A (en) * 1967-10-11 1969-04-22 Foster Wheeler Corp Header system
US3554168A (en) * 1968-10-17 1971-01-12 Stone & Webster Eng Corp Furnace apparatus

Also Published As

Publication number Publication date
BE689999A (fr) 1967-05-22
ES333164A1 (es) 1967-09-01
NL6616647A (fr) 1967-06-15
FR1501384A (fr) 1967-11-10

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