EP0245844A1 - Vorrichtung zur Versteifung einer Kesselwand - Google Patents

Vorrichtung zur Versteifung einer Kesselwand Download PDF

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Publication number
EP0245844A1
EP0245844A1 EP87106890A EP87106890A EP0245844A1 EP 0245844 A1 EP0245844 A1 EP 0245844A1 EP 87106890 A EP87106890 A EP 87106890A EP 87106890 A EP87106890 A EP 87106890A EP 0245844 A1 EP0245844 A1 EP 0245844A1
Authority
EP
European Patent Office
Prior art keywords
fins
tubes
tube
welded
panel
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.)
Withdrawn
Application number
EP87106890A
Other languages
English (en)
French (fr)
Inventor
Jean Fournier
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
Application filed by Stein Industrie SA filed Critical Stein Industrie SA
Publication of EP0245844A1 publication Critical patent/EP0245844A1/de
Withdrawn legal-status Critical Current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

Definitions

  • the present invention relates to a device for stiffening a boiler screen formed by tubes connected by fins, located between two combustion chambers under significantly different pressures. It applies more particularly, but not exclusively, to boiler screens arranged between two solid fuel combustion chambers in a fluidized bed.
  • the pressure difference between the two adjacent chambers can reach 1000. to 3000 mm of water, depending on the operating case.
  • the present invention therefore aims to provide a device for stiffening a boiler screen formed of tubes connected by fins which resists by itself relatively large pressure differences. It also aims to provide tube panel surfaces little exposed to erosion by dust-laden gases.
  • the device according to the invention is characterized in that its tubes are connected to each other by two fins, each of which is on the side of one of the enclosures.
  • the installation for the combustion of pulverulent coal in a fluidized bed comprises a main hearth 1 under a first pressure P1 and an external hearth 2 under a pressure P2.
  • the pulverulent coal and the combustion air are introduced into the hearths by pipes not shown. They form fluidized beds above the bottoms 3 and 4 of the hearths.
  • the side panels 5 and 6 are reinforced by external horizontal beams 8 along the vertical panels 5 and 6, and 10 above the horizontal panel 110A.
  • Panel 7 separates the homes under different pressures.
  • FIG. 2 The structure of the tube panels 5 and 7 is visible in FIG. 2. That of the panel 6 is identical to that of the panel 5. FIGS. 3 and 4 showing variants of that of the panel 7.
  • the panel 5 has the usual structure of parallel tubes 11 connected by fins 11A. These can either be welded on each side to the adjacent tube, as shown, or formed by welding half-fins adjoining each of the tubes, or obtained by depositing metal by welding under flux between adjacent tubes.
  • the panel 7 is stiffened due to its formation from profiled tubes such as 12, 17, 18 joined by two fins.
  • the tube 12 is provided with four half-fins 13, 14, 15, 16.
  • the half-fins 14 and 16 are joined to the corresponding half-fins of the adjacent tube 17 by the weld beads 19 and 20, and the half-fins 13 and 15 are joined to the corresponding half-fins of the other adjacent tube 18 by the weld beads 21 and 22.
  • This structure with two fins has the effect of significantly increasing the inertia of the panel, which resists the pressure difference P2 - P1, symbolized by the arrows to the right of the panel, without the need to provide connection tubes with the side panels. It is sufficient to size the diameter and the thickness of the tubes and the length and the thickness of the fins as a function of the pressure difference between the two hearths and of the distance N separating the side screens.
  • 11- shaped profiled tubes such as 32, 37, 38 are used.
  • the tube 32 includes the half-fins 35, 36, connected as previously by weld beads 39, 40 to the half-fins of the adjacent tubes 37, 38.
  • the second separation membrane connecting the tubes is then constituted by fins such as 41, 42 connected respectively to the adjacent tubes by weld beads such as 43, 44.
  • the membranes between adjacent tubes 52, 57, 58 are constituted by fins such as 61, 64, 67, 68 joined to these tubes by weld beads such as 62, 63, 65, 66.
  • an intermediate panel of tubes such as 7 has on both sides a relatively smooth surface, which notably limits the phenomena of erosion by the dust-laden gases, which are very intense in this type of hearth.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
EP87106890A 1986-05-15 1987-05-12 Vorrichtung zur Versteifung einer Kesselwand Withdrawn EP0245844A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8607007 1986-05-15
FR8607007A FR2598782B1 (fr) 1986-05-15 1986-05-15 Dispositif de raidissage d'un ecran de chaudiere.

Publications (1)

Publication Number Publication Date
EP0245844A1 true EP0245844A1 (de) 1987-11-19

Family

ID=9335282

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87106890A Withdrawn EP0245844A1 (de) 1986-05-15 1987-05-12 Vorrichtung zur Versteifung einer Kesselwand

Country Status (3)

Country Link
EP (1) EP0245844A1 (de)
FR (1) FR2598782B1 (de)
ZA (1) ZA873464B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9413367U1 (de) * 1994-08-18 1994-11-03 Evt Energie- Und Verfahrenstechnik Gmbh, 70329 Stuttgart Rohrwand
DE9413546U1 (de) * 1994-08-23 1994-11-03 Evt Energie- Und Verfahrenstechnik Gmbh, 70329 Stuttgart Dampferzeuger
DE19527885A1 (de) * 1994-08-18 1996-03-14 Evt Energie & Verfahrenstech Rohrwand
US8579495B2 (en) 2006-09-21 2013-11-12 Basf Se Process for mixing a liquid or mixture of a liquid and a fine solid present in an essentially self-containing vessel

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1791064A (en) * 1931-02-03 Joseph bradley murray
US2299732A (en) * 1937-12-30 1942-10-27 Babcock & Wilcox Co Steam generator
FR1004820A (fr) * 1947-05-19 1952-04-03 Tubes à ailettes
US2660155A (en) * 1949-01-12 1953-11-24 Combustion Eng Steam generating tubular water wall
FR2374588A1 (fr) * 1976-12-15 1978-07-13 Foster Wheeler Power Prod Perfectionnements aux generateurs de vapeur
US4184455A (en) * 1978-04-10 1980-01-22 Foster Wheeler Energy Corporation Fluidized bed heat exchanger utilizing angularly extending heat exchange tubes

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1791064A (en) * 1931-02-03 Joseph bradley murray
US2299732A (en) * 1937-12-30 1942-10-27 Babcock & Wilcox Co Steam generator
FR1004820A (fr) * 1947-05-19 1952-04-03 Tubes à ailettes
US2660155A (en) * 1949-01-12 1953-11-24 Combustion Eng Steam generating tubular water wall
FR2374588A1 (fr) * 1976-12-15 1978-07-13 Foster Wheeler Power Prod Perfectionnements aux generateurs de vapeur
US4184455A (en) * 1978-04-10 1980-01-22 Foster Wheeler Energy Corporation Fluidized bed heat exchanger utilizing angularly extending heat exchange tubes

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9413367U1 (de) * 1994-08-18 1994-11-03 Evt Energie- Und Verfahrenstechnik Gmbh, 70329 Stuttgart Rohrwand
DE19527885A1 (de) * 1994-08-18 1996-03-14 Evt Energie & Verfahrenstech Rohrwand
DE9413546U1 (de) * 1994-08-23 1994-11-03 Evt Energie- Und Verfahrenstechnik Gmbh, 70329 Stuttgart Dampferzeuger
US8579495B2 (en) 2006-09-21 2013-11-12 Basf Se Process for mixing a liquid or mixture of a liquid and a fine solid present in an essentially self-containing vessel

Also Published As

Publication number Publication date
FR2598782B1 (fr) 1990-02-02
ZA873464B (en) 1987-11-05
FR2598782A1 (fr) 1987-11-20

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: FOURNIER, JEAN