EP0477849B1 - Dispositif de refroidissement de la paroi d'un foyer de chaudière à lit fluidisé dans une zone mediane - Google Patents

Dispositif de refroidissement de la paroi d'un foyer de chaudière à lit fluidisé dans une zone mediane Download PDF

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Publication number
EP0477849B1
EP0477849B1 EP91116223A EP91116223A EP0477849B1 EP 0477849 B1 EP0477849 B1 EP 0477849B1 EP 91116223 A EP91116223 A EP 91116223A EP 91116223 A EP91116223 A EP 91116223A EP 0477849 B1 EP0477849 B1 EP 0477849B1
Authority
EP
European Patent Office
Prior art keywords
tubes
sloping
upsidedown
ridge
hearth
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
EP91116223A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0477849A1 (fr
Inventor
Jean-Claude Semedard
Jean Aubry
Jean-Paul Tessier
Gérard Tondeur
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.)
Stein Industrie SA
Original Assignee
Stein Industrie SA
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
Priority claimed from FR9011859A external-priority patent/FR2667133B1/fr
Priority claimed from FR9103700A external-priority patent/FR2674614B1/fr
Application filed by Stein Industrie SA filed Critical Stein Industrie SA
Publication of EP0477849A1 publication Critical patent/EP0477849A1/fr
Application granted granted Critical
Publication of EP0477849B1 publication Critical patent/EP0477849B1/fr
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
    • F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
    • F22B31/0007—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed
    • F22B31/0015—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed for boilers of the water tube type
    • F22B31/003—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed for boilers of the water tube type with tubes surrounding the bed or with water tube wall partitions
    • 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
    • F22B37/40—Arrangements of partition walls in flues of steam boilers, e.g. built-up from baffles

Definitions

  • the present invention relates to a device for cooling the wall of a fluidized-bed boiler hearth in a middle section of vertical cross section in the general shape of an inverted V junction between lower portions of trapezoidal vertical cross section above two parallel sole and an upper part of rectangular cross section, with front and rear faces parallel to the edge of the inverted V, and with lateral faces perpendicular to this edge, said wall being provided with heat exchange tubes traversed by water or a water and steam emulsion, the inclined faces of the inverted V being provided with exchange tubes parallel to the lateral edges of the inverted V known as creeping.
  • the object of the present invention is to provide a device for cooling such a zone in natural circulation, using a continuous tubular system comprising no descending element.
  • the crawlers are connected to substantially horizontal heat exchange tubes arranged in the sides of the lower parts in an upper zone, along the edge of the inverted V and extending to proximity to the side faces where they open into vertical tubes fitted to the side faces of the fireplace.
  • all the tubes are arranged symmetrically with respect to the plane of symmetry parallel to the lateral faces of the hearth.
  • the heat exchange tubes of the median zone are connected to the tubes arranged in the sides of the lower parts in an inverted pyramid trunk by means of a collector placed under the wall of the median zone, the vertical edge of the inverted V.
  • the crawlers are connected by groups of n crawlers to the substantially horizontal heat exchange tubes, called connection tubes.
  • the groups of n crawlers are preferably connected to their respective connection tube at different heights, the different connection tubes being superimposed relative to each other in the inclined faces.
  • said heights are regularly increasing from the group of n crawlers closest to one of the lateral faces to the group of n crawlers closest to said plane of symmetry, the latter being interrupted near the edge of the upper zone.
  • the groups of n crawlers are connected two by two in sets of 2 n crawlers via the connection tubes , the latter being connected at their mutual junction to a corresponding vertical tube.
  • the junction between two connection tubes is produced by a hairpin-shaped extension of the connection tube of the group of n crawlers closest to one of the lateral faces of the hearth, the outlet of the pin with hair aligned with the connecting tube of the other group of n crawlers.
  • FIG. 1 represents the general arrangement of the middle zone separating the two lower legs of a boiler hearth with two separate hearths comprising the device according to the invention.
  • Figure 2 shows on a larger scale the arrangement of the tubes in this area, according to the first variant.
  • Figure 3 shows on a larger scale the arrangement of the tubes in this area, according to the second variant.
  • the hearth has a front face 1, a rear face 2 and two lateral faces 3 and 4. Its two hearths 5 and 6 are separated by an interval 7, so that the two lower parts of the hearth in the form of jamb have inclined sides 8 and 9 connecting in the upper zone 10 along an edge 11, parallel to the front and rear faces of the hearth.
  • the manifold 12 for supplying water or emulsion of water and cooling vapor is arranged in the plane of symmetry of the hearth parallel to its front and rear faces 1 and 2, away from the smoke of the foyer. It is connected on both sides to inlet tubes 13, 14 arranged on the sides 8, 9, called “vault crawlers", inclined at 24 ° to the vertical, and it itself feeds tubes such as 15 for connection with hairpin tubes such as 16, 18 arranged on the wall of the upper zone.
  • the tubes 16, 18 are connected in a known manner by welded fins, not shown, and are connected to vertical tubes such as 17, 19 which rise along the lateral faces 3, 4 of the hearth.
  • the manifold 12 is also connected in the vicinity of the plane of symmetry parallel to the lateral faces 3, 4 of the hearth by vertical tubes such as 20 to straight horizontal tubes such as 21, 22 diverging on either side of this plane of symmetry , and arranged in the area 10 near the upper edge 11, which open into the vertical tubes 23, 24 of the side faces.
  • the tubes such as 21, 22 are preferably arranged on face portions making a higher angle, for example of 55 °, with the vertical, so that the edge 11 of FIG. 1 is then a virtual edge.
  • These tubes are also connected by fins, not shown.
  • the device according to the second variant is described in FIG. 3.
  • the inlet tubes 13, 14, called vault crawlers, inclined at 24 ° relative to the vertical, are arranged on the surface of the inclined sides 8, 9.
  • the ramps 13, 14 are connected by group of n ramps.
  • the crawlers are connected in groups of 3.
  • the number of crawlers per group is defined as a function of the desired flow rate at the outlet in the vertical tubes 17 on the side walls of the hearth.
  • the arrangement of the tubes is symmetrical with respect to the central vertical plane parallel to the lateral faces 3, 4 of the hearth, half of the ramps 13, 14 being connected to vertical tubes 17 of the lateral face 3, the other half being connected to vertical tubes 17 on the other side face 4.
  • the trace of this plane of symmetry is symbolized by the line AA in FIG. 3.
  • the ramps 13, 14 are interrupted in groups of three, at different heights, the group closest to the plane symbolized by A-A going as far as the edge 11 of zone 10.
  • the horizontal tubes 120 are, in turn, connected two by two before being connected to a vertical tube 17.
  • This connection is achieved by hairpin extensions 160 of the lower tube 120 of each pair of tubes 120 adjacent.
  • This extension 160 takes place outside of zone 10. Its purpose is, on the one hand, to allow the use of a conventional T-connector at the connection of the corresponding vertical tube 17, on the other hand '' balance the lengths and flows arriving at this connection.
  • the tubes are connected in the plane by welded fins, not shown, except in the overflow zone of zone 10, namely the hairpins 160.
  • the zone 10 having a height of approximately 2.7 m, the pitch between the ramps 13, 14 is approximately 88 mm, their diameter being approximately 44.5 mm; the pitch between horizontal tubes 120 is approximately 94mm and that between vertical tubes approximately 76.5mm, the diameter of the latter being approximately 63.5mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
EP91116223A 1990-09-26 1991-09-24 Dispositif de refroidissement de la paroi d'un foyer de chaudière à lit fluidisé dans une zone mediane Expired - Lifetime EP0477849B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9011859A FR2667133B1 (fr) 1990-09-26 1990-09-26 Dispositif de refroidissement de la paroi d'un foyer de chaudiere a lit fluidise dans une zone mediane.
FR9011859 1990-09-26
FR9103700 1991-03-27
FR9103700A FR2674614B1 (fr) 1991-03-27 1991-03-27 Dispositif de refroidissement de la paroi d'un foyer de chaudiere a lit fluidise dans une zone mediane.

Publications (2)

Publication Number Publication Date
EP0477849A1 EP0477849A1 (fr) 1992-04-01
EP0477849B1 true EP0477849B1 (fr) 1995-01-18

Family

ID=26228251

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91116223A Expired - Lifetime EP0477849B1 (fr) 1990-09-26 1991-09-24 Dispositif de refroidissement de la paroi d'un foyer de chaudière à lit fluidisé dans une zone mediane

Country Status (7)

Country Link
US (1) US5168819A (fi)
EP (1) EP0477849B1 (fi)
CN (1) CN1050413C (fi)
CA (1) CA2052230C (fi)
DE (1) DE69106822T2 (fi)
ES (1) ES2067823T3 (fi)
FI (1) FI97315C (fi)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2757930B1 (fr) * 1997-01-02 1999-02-26 Gec Alsthom Stein Ind Foyer pour chaudiere a lfc a sole amelioree
FR2760829B1 (fr) * 1997-03-13 1999-05-14 Gec Alsthom Stein Ind Echangeur a lit fluidise dense destine a etre associe a un reacteur a lit fluidise circulant
FR2837561B1 (fr) * 2002-03-25 2004-05-21 Alstom Switzerland Ltd Foyer de chaudiere a lit fluidise comprenant deux soles separees par un entrejambe
CN101696798B (zh) * 2009-05-18 2011-05-04 西安热工研究院有限公司 带有异型分隔墙的紧凑型循环流化床锅炉
FI124376B (fi) * 2010-01-15 2014-07-31 Foster Wheeler Energia Oy Höyrykattila
CN101818894B (zh) * 2010-04-29 2011-10-26 清华大学 一种循环流化床锅炉
DE102010028426A1 (de) * 2010-04-30 2011-11-03 Siemens Aktiengesellschaft Dampferzeuger
CN102997231B (zh) * 2012-12-31 2015-06-24 中国科学院工程热物理研究所 大型循环流化床锅炉、布风装置和布风装置组件

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1604221A (en) * 1977-05-02 1981-12-02 Appa Thermal Exchanges Ltd Removal of ash from fluidised beds
CA1285375C (en) * 1986-01-21 1991-07-02 Takahiro Ohshita Thermal reactor
SE462995B (sv) * 1987-05-07 1990-09-24 Abb Stal Ab Kraftanlaeggning med foerbraenning av ett braensle i en fluidiserad baedd av partikulaert material
US4854854A (en) * 1987-05-07 1989-08-08 Abb Stal Ab Fluidized bed fuel-fired power plant
SE462445B (sv) * 1989-02-10 1990-06-25 Abb Stal Ab Kraftanlaeggning med foerbraenning av ett braensle i en fluidiserad baedd

Also Published As

Publication number Publication date
FI914456A0 (fi) 1991-09-23
CN1061653A (zh) 1992-06-03
DE69106822D1 (de) 1995-03-02
EP0477849A1 (fr) 1992-04-01
FI97315C (fi) 1996-11-25
CA2052230C (fr) 1995-01-17
DE69106822T2 (de) 1995-05-18
ES2067823T3 (es) 1995-04-01
FI97315B (fi) 1996-08-15
US5168819A (en) 1992-12-08
CA2052230A1 (fr) 1992-03-27
FI914456A (fi) 1992-03-27
CN1050413C (zh) 2000-03-15

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