EP1041340A1 - Geschweisste Düse für Kohlenstaubbrenner - Google Patents

Geschweisste Düse für Kohlenstaubbrenner Download PDF

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Publication number
EP1041340A1
EP1041340A1 EP00400533A EP00400533A EP1041340A1 EP 1041340 A1 EP1041340 A1 EP 1041340A1 EP 00400533 A EP00400533 A EP 00400533A EP 00400533 A EP00400533 A EP 00400533A EP 1041340 A1 EP1041340 A1 EP 1041340A1
Authority
EP
European Patent Office
Prior art keywords
envelope
lateral faces
nozzle
faces
pulverized coal
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Withdrawn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
EP00400533A
Other languages
English (en)
French (fr)
Inventor
Daniel Buridant
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.)
Alstom Power Boiler SA
Original Assignee
ABB Alstom Power Combustion
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 ABB Alstom Power Combustion filed Critical ABB Alstom Power Combustion
Publication of EP1041340A1 publication Critical patent/EP1041340A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2201/00—Burners adapted for particulate solid or pulverulent fuels
    • F23D2201/10—Nozzle tips
    • F23D2201/101—Nozzle tips tiltable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2211/00—Thermal dilatation prevention or compensation

Definitions

  • the invention relates to a steerable nozzle for injecting pulverized coal into the hearth of a thermal power station boiler, comprising a first metal shell in the shape of a truncated prism having a upper side, one lower side and two sides side, a second metal envelope in the form of truncated prism coaxially surrounding the first envelope by defining with it an annular space used for passage of a secondary air flow, the first envelope used to channel a flow of primary air mixed with pulverized coal, the two envelopes being integral from each other and inside the first envelope being divided by parallel separating sheets between them and perpendicular to the lateral faces of the first envelope, the nozzle further comprising two studs articulation in rotation around a median axis perpendicular to said side faces of the first envelope.
  • Such a nozzle is intended to equip a burner with pulverized charcoal mounted on the walls of the hearth of a central heating boiler between the ashtray and heat exchangers as is well known.
  • This nozzle is used to direct the pulverized coal mixed with primary air to the interior of the fireplace.
  • This nozzle is rotatably mounted to be tilted in a plane vertical so that air can be directed to an area of the focus more or less close to the screens so as to adjust the heating power of the boiler.
  • this type of nozzle is made of steel one-piece refractory molded for the first envelope while the second envelope is made at from a folded and welded refractory steel sheet.
  • the separation sheets inside the first envelope are welded to the side faces thereof.
  • Such a nozzle is subjected to very thermal stresses important.
  • the temperatures at the front of the nozzle face of the nozzle through which the primary and secondary air flow
  • the areas in front of the nozzle can be subjected to high but different temperatures. The applicant observed that these thermal stresses important cause deformations of the parts components of the nozzle, cracks in the parts moldings and ruptures of the welding points between the partition plates and the side faces of the first envelope.
  • the object of the invention is to provide a nozzle adjustable for injecting pulverized coal into the hearth of a thermal power station boiler having a better resistance to these thermal stresses.
  • the idea behind the invention is a nozzle for design in welded or nested sheets.
  • Figure 1 shows very schematically in a view in side elevation, part of a burner box equipping the fireplace with a thermal power plant boiler and with steerable nozzles for coal injection sprayed.
  • Figure 2 shows schematically a front view of a nozzle according to the invention.
  • Figure 3 shows schematically a top view of a nozzle according to the invention.
  • the burner box 1 which is shown partially is attached to angle angles 2 of a thermal power plant boiler hearth. When he is mounted in the hearth of a boiler, the box extends vertically as illustrated in Figure 1.
  • Box 1 includes a series of compartments 3,4,5,6,7 open towards the interior of the hearth and through which air is supplied to the interior of the fireplace, the opening section of each compartment having a shape substantially rectangular. Two adjacent compartments are separated by a sheet 8 extending in a plane horizontal. The compartments of the box are closed on the side outside the foyer by registers (not shown).
  • An adjustable nozzle is arranged at the opening (of the side of the hearth) of each compartment to channel and direct the air into the interior of the fireplace.
  • the compartments have different sizes depending on whether they receive a nozzle simple secondary air such as 9.9 'or a nozzle oil burner such as 10 or a burner nozzle pulverized coal such as 11.11 '.
  • the nozzle 10 of an oil burner is adjacent to two single nozzles 9.9 'of secondary air.
  • Each nozzle 9,9'10,11,11 ' is rotatably mounted around of a horizontal axis respectively 9A, 9'A, 10A, 11A, 11'A for tilt in a vertical plane to direct the air following a certain direction towards the center of the hearth between the top and bottom of the fireplace.
  • the space between the nozzles in the box is imposed by the operating characteristics of the fireplace. Of in general, the space between the nozzles is small because always looking to focus the burners to get the greatest firepower possible. In addition, nozzles close the opening of the compartments to obtain a fine adjustment of the print and the space left free by a nozzle in the opening of a compartment can if necessary be filled with shims 12.
  • the nozzles 9.9A and 10 with the oil burner can be fitted and removed from the casing from inside the fireplace while the 11.11 'nozzles which are each connected to a pulverized coal burner assemble and disassemble from the box from outside the foyer.
  • the mechanism for tilting the nozzles 9,9 'and 10 comprises a rod 13 which extends vertically and parallel to the box and which is common to these three adjacent nozzles.
  • Rod 13 connects the pivots of rotary operation 9B, 9'B10B (which are offset from the axis of nozzle rotation) of the nozzles respectively 9,10,9 'of such that an inclination of one of the three nozzles 9.9 'or 10 simultaneously causes the same inclination of the two other nozzles.
  • FIG. 1 it can be seen that the maneuvering pivots in rotation of the nozzles 9.9 ′, 10 are arranged at the end of lever arms each rotatably mounted by its other end on the axis of rotation 9A, 10A, 9'A of the nozzle corresponding 9,10,9 'and whose bottom angular rotation at the top and vice versa causes the same movement of the nozzle corresponding.
  • the control rod 14 for example mounted articulated on the nozzle 10 and allowing the inclination of the nozzle 10 by a translational movement substantially horizontal is also used to tilt the three nozzles 9,10,9 '.
  • Each nozzle 11 and 11 ' keeps its own control rod 15.15 'to be tilted.
  • Figures 2 and 3 illustrate the sheet metal design welded or fitted according to the invention of a nozzle injection of pulverized coal such as 11.11 'on the figure 1.
  • a nozzle injection of pulverized coal such as 11.11 'on the figure 1.
  • a nozzle injection of pulverized coal such as 11.11 'on the figure 1.
  • a nozzle injection of pulverized coal such as 11.11 'on the figure 1.
  • the axis of rotation is indicated by A in Figures 2 and 3 and through 11A, 11'A in Figure 1.
  • the orientable nozzle according to the invention comprises a first metal casing 30 in the form of a prism based rectangular truncated parallel to its base and having a upper face 30A, a lower face 30B and two faces side 30C, 30D.
  • the envelope 30 is used to channel the flow primary air mixed with pulverized coal.
  • the nozzle also includes a second envelope metallic 31 in the form of a prism with a rectangular base truncated parallel to its base which coaxially surrounds the first envelope 30 and defining therewith a space annular 32 serving for the passage of a secondary air flow.
  • the second envelope has an upper face 31A, a underside 31B and two side faces 31C, 31D.
  • the faces 30C, 30D, 31C and 31D are parallel to each other.
  • the angle of the prism forming the second envelope can be slightly less than the angle of the prism forming the first envelope so that the annular space expands in from the back of the nozzle (indicated by Ar in the figure 1) towards the front of the nozzle (indicated by Av in 1 figure 1) where the air flows come from.
  • the second envelope 31 is less deep, along the longitudinal axis B, that the first envelope 30 to promote cooling of the front of this last through the secondary air flow.
  • envelopes 31 and 31 each consist of of two half-shells formed from a steel sheet refractory that has been bent. More specifically, the envelope 30 consists of two half-shells 30E and 30F each having a cross section on axis B substantially U-shaped. These two half-shells are assembled by two continuous and penetrating weld beads 33.33 ' on the faces 30A, 30B of the envelope 30. These cords of weld extend in a median plane parallel to the faces 30C, 30D of the envelope 30 and passing through the axis B.
  • the envelope 31 also consists of two half-shells 31E and 31F formed from a steel sheet refractory which has been folded, these half-shells having each also a cross section to the B axis substantially U-shaped. These two half-shells are assembled by two continuous and penetrating welding seams 34.34 ' on the faces 31C, 31D of the envelope 31. These cords of weld extend in a median plane perpendicular to the faces 30C, 30D of the envelope 30 and passing through the axis A.
  • This design of the nozzle casings allows avoid the corner welds that cause many mechanical strength problems under stress thermal.
  • the two envelopes 30 and 31 are fixed one to the other by fixing studs 36 welded on the faces 30A and 30B of the envelope 30, respectively on the faces 31A, 31B of the envelope 31, inside the space annular 32.
  • These pads are more particularly arranged in two rows parallel to the B axis of 3 studs each on the face 30A and on the face 30B of the envelope 30 as visible in figure 3. It is preferable that the rows of pads 36 are arranged near the vertical axis median C of the nozzle so as to allow displacement relative of the lateral faces 30C, 30D with respect to the faces lateral 31C, 31D under the effect of thermal stresses.
  • the nozzle also includes two articulation pads in rotation 37A and 37B about the axis A perpendicular to the say side faces of the first envelope, here axis A.
  • Rotating articulation pads 37A and 37B are welded on the faces 30C and 30D of the casing 30 at the rear of the nozzle and pass through the casing 31 without contact through orifices provided in the latter so as to allow relative movement of the side faces of the envelope 30 relative to the lateral faces of the envelope 31 under the effect of thermal stresses.
  • the interior of the envelope 30 is divided by sheets separators 38,39 made of refractory steel which are parallel between them and perpendicular to the faces 30C and 30D. These sheets to guide the pulverized coal in the hearth when the nozzle is tilted relative to a position horizontal.
  • the partition plates 38 and 39 are fixed to the lateral faces 30C and 30D of the envelope 30 by nesting their ends in lights provided in these side faces. The ends of these sheets pass through said lights to receive blocking tabs 40.
  • These blocking tabs are for example in the form of wedges driven into holes provided at the ends of the partition plates.
  • These cleats are arranged in the annular space 32 in leaving each clearance sheet with a certain amount of displacement in a direction perpendicular to the faces lateral 30C and 30D so as to allow them to resume differences in expansion on the sides of the envelope 30.
  • the central partition plate 41 which extends along the axis of rotation A is fixed to the faces side 30C and 30D of the casing 30 by welding its extremities.
  • this central partition plate has a wavy shape that allows it to pick up expansion effects of nozzle parts without soldering stress.
  • the construction of the nozzle according to the invention contributes to strengthen its mechanical resistance to thermal stress by reducing the deformation effects of the parts which constitute. It follows that the lifespan of such a nozzle is increased compared to steel construction molded refractory.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
EP00400533A 1999-03-30 2000-02-28 Geschweisste Düse für Kohlenstaubbrenner Withdrawn EP1041340A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9903961 1999-03-30
FR9903961A FR2791760B1 (fr) 1999-03-30 1999-03-30 Buse d'injection de charbon pulverise en tole ou emboitees pour chaudiere de centrale thermique

Publications (1)

Publication Number Publication Date
EP1041340A1 true EP1041340A1 (de) 2000-10-04

Family

ID=9543806

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00400533A Withdrawn EP1041340A1 (de) 1999-03-30 2000-02-28 Geschweisste Düse für Kohlenstaubbrenner

Country Status (3)

Country Link
US (1) US6189812B1 (de)
EP (1) EP1041340A1 (de)
FR (1) FR2791760B1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6761304B2 (en) * 2000-11-13 2004-07-13 Czeslaw A. Ruszowski Heating head for soldering and de-soldering of SMD components
JP4898393B2 (ja) * 2006-11-09 2012-03-14 三菱重工業株式会社 バーナ構造
US8267020B2 (en) 2007-06-05 2012-09-18 Alstom Technology Ltd Coal nozzle tip shroud
US8701572B2 (en) * 2008-03-07 2014-04-22 Alstom Technology Ltd Low NOx nozzle tip for a pulverized solid fuel furnace
US8561553B2 (en) * 2009-12-17 2013-10-22 Babcock Power Services, Inc. Solid fuel nozzle tip assembly
US20120103237A1 (en) * 2010-11-03 2012-05-03 Ronny Jones Tiltable multiple-staged coal burner in a horizontal arrangement
CN114055061A (zh) * 2021-12-29 2022-02-18 江苏大力神科技股份有限公司 一种焊机加热装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3823875A (en) * 1973-08-24 1974-07-16 T Bauer Burner nozzle tip for pulverized coal and method for its production
GB2240619A (en) * 1990-02-06 1991-08-07 Lintec Engineering Swivel nozzle burner
US5215259A (en) * 1991-08-13 1993-06-01 Sure Alloy Steel Corporation Replaceable insert burner nozzle
FR2689211A1 (fr) * 1992-03-30 1993-10-01 Stein Industrie Busette orientable en matériau réfractaire pour injection d'air et de combustible dans les brûleurs de chaudières de centrales thermiques.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4356975A (en) * 1980-03-07 1982-11-02 Combustion Engineering, Inc. Nozzle tip for pulverized coal burner
US5662464A (en) * 1995-09-11 1997-09-02 The Babcock & Wilcox Company Multi-direction after-air ports for staged combustion systems
AU722294B2 (en) * 1996-07-08 2000-07-27 Alstom Power Inc. Pulverized solid fuel nozzle tip

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3823875A (en) * 1973-08-24 1974-07-16 T Bauer Burner nozzle tip for pulverized coal and method for its production
GB2240619A (en) * 1990-02-06 1991-08-07 Lintec Engineering Swivel nozzle burner
US5215259A (en) * 1991-08-13 1993-06-01 Sure Alloy Steel Corporation Replaceable insert burner nozzle
FR2689211A1 (fr) * 1992-03-30 1993-10-01 Stein Industrie Busette orientable en matériau réfractaire pour injection d'air et de combustible dans les brûleurs de chaudières de centrales thermiques.

Also Published As

Publication number Publication date
US6189812B1 (en) 2001-02-20
FR2791760B1 (fr) 2001-05-25
FR2791760A1 (fr) 2000-10-06

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