EP0349765B1 - Wirbelschichtfeuerung - Google Patents

Wirbelschichtfeuerung Download PDF

Info

Publication number
EP0349765B1
EP0349765B1 EP89109976A EP89109976A EP0349765B1 EP 0349765 B1 EP0349765 B1 EP 0349765B1 EP 89109976 A EP89109976 A EP 89109976A EP 89109976 A EP89109976 A EP 89109976A EP 0349765 B1 EP0349765 B1 EP 0349765B1
Authority
EP
European Patent Office
Prior art keywords
protective shields
strips
tube panel
fluidized bed
fluidised
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
EP89109976A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0349765A1 (de
Inventor
Helmuth Huschauer
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.)
Deutsche Babcock Werke Energie und Umwelttechnik AG
Original Assignee
Deutsche Babcock Werke Energie und Umwelttechnik AG
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 Deutsche Babcock Werke Energie und Umwelttechnik AG filed Critical Deutsche Babcock Werke Energie und Umwelttechnik AG
Publication of EP0349765A1 publication Critical patent/EP0349765A1/de
Application granted granted Critical
Publication of EP0349765B1 publication Critical patent/EP0349765B1/de
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 or dispositions of combustion apparatus
    • F22B31/0007—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements or dispositions of combustion apparatus with combustion in a fluidized bed
    • F22B31/0061—Constructional features of bed cooling

Definitions

  • the invention relates to a fluidized bed combustion according to the preamble of claim 1.
  • DE-A-3347083 is concerned with heat exchangers which have side surfaces on both sides parallel to the direction of flow of the vortex air.
  • an upright bar is welded to each horizontal tube on both sides, the width of which corresponds to the tube diameter.
  • the strips of tubes arranged one above the other form a flat, vertical side surface which has a gap between two strips.
  • the tube sheets are embedded in erosion-resistant ramming compounds.
  • the heat transfer tubes of a fluidized bed boiler are provided with wear protection devices at the points which are exposed to the fluidized bed material.
  • wear protection devices for example in the form of semi-cylindrical shells which are attached to the undersides of the tubes.
  • the wear is not limited to certain areas. It cannot be ruled out that erosion will occur in the unprotected areas.
  • the invention has for its object to avoid the disadvantages of the prior art and to design and arrange the wear protection elements in a fluidized bed combustion of the type specified in such a way that the heat exchanger is better protected against erosion without impairing the heat transfer.
  • a perforated intermediate floor 2 e.g. a nozzle bottom, an air chamber 3 separated, which is connected to a blower 4.
  • the fluidized bed 5, consisting of a layer of granular material, is located above the intermediate floor 2.
  • Several heat exchangers in the form of tube sheets 6 are immersed in this layer.
  • Each tube plate 6 consists of several - in the embodiment shown in Figure 1 a total of six - horizontal tubes 7, the axes of which lie in a vertical plane.
  • the tubes 7 of a tube plate 6 are, for example, connected in a conventional manner by mutually arranged hairpin-shaped elbows to form a continuous zigzag tube or connected at one end to a common distributor and at the other end to a common header.
  • Protective shields 9, 10 are arranged on both sides of the tube plate 6, mirror-symmetrically with respect to the plane formed by the axes of the tubes 7, which are held on the tube plate 6 with the aid of fastening means, not shown, and with their upper and lower edges over the tube plate 6 protrude. There is a distance a between the tubes 7 and the protective shields 9, 10, which corresponds to approximately 0.5 to 1.5 times the tube diameter.
  • strips 11, 12 are fastened on the side facing the tube plate 6. There is a gap between the strips 11, 12, the width of which is approximately 30 to 60% of the distance between the two protective shields 9, 10. In a corresponding manner, strips 13, 14 are also attached to the upper edges of the protective shields 9, 10.
  • the protective shields 9, 10 together with the strips 11, 12, 13, 14 form a flat, upright box, which encloses the tubular panel 6 on all sides at a distance and has a narrow longitudinal slot on its top and bottom.
  • the fluidized bed 5 is kept in a fluidized state by the air which is supplied by means of the fan 4.
  • the upward airflow between the two protective shields 9, 10 is throttled by the strips 11, 12, 13, 14. Its speed is therefore not sufficient to fluidize the granular fluidized bed material that penetrates between the two strips 13, 14 in the space between the two protective shields 9, 10.
  • the hot material therefore trickles down the tubes 7, optionally forms a loose, slipping bed in the lower part of the intermediate space and flows out through the gap between the strips 11, 12.
  • the intensive contact of the hot material with the outer surfaces of the tubes 7 ensures good heat transfer. Since the flow velocity between the protective shields 9, 10 is significantly reduced, the erosion is reduced. If erosion damage occurs on the protective shields 9, 10, these can be easily replaced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
EP89109976A 1988-07-07 1989-06-02 Wirbelschichtfeuerung Expired - Lifetime EP0349765B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3823040 1988-07-07
DE3823040A DE3823040A1 (de) 1988-07-07 1988-07-07 Wirbelschichtfeuerung

Publications (2)

Publication Number Publication Date
EP0349765A1 EP0349765A1 (de) 1990-01-10
EP0349765B1 true EP0349765B1 (de) 1992-01-08

Family

ID=6358178

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89109976A Expired - Lifetime EP0349765B1 (de) 1988-07-07 1989-06-02 Wirbelschichtfeuerung

Country Status (2)

Country Link
EP (1) EP0349765B1 (enrdf_load_stackoverflow)
DE (2) DE3823040A1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2712378B1 (fr) * 1993-11-10 1995-12-29 Stein Industrie Réacteur à lit fluidisé circulant à extensions de surface d'échange thermique.
FI124032B1 (fi) 2006-04-20 2014-02-14 Metso Power Oy Leijukattila ja sen arinaelementti

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2884373A (en) * 1954-10-20 1959-04-28 Exxon Research Engineering Co Method and apparatus for heating fluids
DE3117195A1 (de) * 1981-04-30 1982-11-11 Bergwerksverband Gmbh, 4300 Essen Verfahren und vorrichtung zur verminderung des waerme- und stoffaustausches in unmittelbarer wandnaehe von wirbelschichtreaktoren
US4619314A (en) * 1983-08-05 1986-10-28 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Device for preventing wear of heat transfer tubes in fluidized-bed boiler
DE3347083A1 (de) * 1983-12-24 1985-07-04 Vereinigte Kesselwerke AG, 4000 Düsseldorf Tauchheizflaechen fuer eine wirbelschichtfeuerung
CA1285375C (en) * 1986-01-21 1991-07-02 Takahiro Ohshita Thermal reactor

Also Published As

Publication number Publication date
DE58900693D1 (de) 1992-02-20
DE3823040A1 (de) 1990-01-11
DE3823040C2 (enrdf_load_stackoverflow) 1991-08-29
EP0349765A1 (de) 1990-01-10

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