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EP0631091A1 - Gasbrenner mit niedrigem NOx-Ausstoss - Google Patents

Gasbrenner mit niedrigem NOx-Ausstoss Download PDF

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Publication number
EP0631091A1
EP0631091A1 EP94401336A EP94401336A EP0631091A1 EP 0631091 A1 EP0631091 A1 EP 0631091A1 EP 94401336 A EP94401336 A EP 94401336A EP 94401336 A EP94401336 A EP 94401336A EP 0631091 A1 EP0631091 A1 EP 0631091A1
Authority
EP
European Patent Office
Prior art keywords
holes
sheet
burner
tubular body
gas burner
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Withdrawn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
EP94401336A
Other languages
English (en)
French (fr)
Inventor
Jacques Bouix
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.)
MTS SA
Original Assignee
MTS 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 MTS SA filed Critical MTS SA
Publication of EP0631091A1 publication Critical patent/EP0631091A1/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Withdrawn legal-status Critical Current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
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2203/00—Gaseous fuel burners
    • F23D2203/10—Flame diffusing means
    • F23D2203/101—Flame diffusing means characterised by surface shape
    • F23D2203/1012—Flame diffusing means characterised by surface shape tubular

Definitions

  • the present invention relates to a gas burner of the type comprising a tubular body having a first end at least partially open for the admission of air and gaseous fuel into the internal space of the tubular body, a second closed end and a wall peripheral pierced with a multitude of through holes for the combustible gas mixture which burns on the outer peripheral surface of the tubular body, the peripheral wall of the tubular body being constituted by two perforated sheets, respectively inner and outer, held in contact with one another with the other, the inner sheet has holes which have a predetermined diameter, while the outer sheet has holes having a larger cross section than that of the holes in the inner sheet.
  • Gas burners of the above-mentioned type are well known. They are for example used in boilers models CECID HX135, HX175, ... HX495 marketed by the applicant.
  • the tubular body of these known burners is made with an inner perforated sheet of small thickness (of the order of 0.7 mm) having round perforations with a diameter of 0.8 mm, this latter dimension corresponding to the distance from safety necessary to avoid flashbacks inside the tubular body of the burner.
  • the distance between the round perforations is 1.5 mm, which determines, for the internal perforated sheet, a passage coefficient of 25% (ratio of the cumulative surface of the round perforations to the total surface of the internal perforated sheet) .
  • Perforated sheet outer of the tubular body of these known burners has a thickness of 1.5 mm and it is perforated with square holes arranged in a matrix in rows and columns.
  • the length of the rib of each square hole is 6 mm and the interval between two adjacent holes belonging to the same row or to the same column is 4 mm wide.
  • the external perforated sheet has a passage coefficient of the order of 36%, which gives, after assembly of the two internal and external perforated sheets, an overall passage coefficient of approximately 9%.
  • the present invention therefore aims to achieve this objective.
  • the burner according to the present invention is characterized in that the spacing of the holes in the outer sheet and their passage section are such that the assembly of the two perforated sheets of the burner has an overall coefficient of passage of gases through the glus equal to 7.8%.
  • the outer sheet has a thickness at least equal to 2 mm.
  • the holes in the outer sheet are preferably circular and preferably have a diameter at most equal to 6 mm.
  • the burner 1 represented in FIG. 1 is in the form of a tubular body, one end of which 3 is at least partially open for the admission of air and gaseous fuel and the opposite end of which is closed so gas-tight by a wall 4.
  • the end 3 of the tubular body is completely open, it could be closed by a wall having for example two intake ports, one for the primary combustion air and one for the gaseous fuel, or a single intake port for the air-gas mixture if the air and the gas have been mixed beforehand.
  • the peripheral wall 5 of the tubular body 2 is pierced with a multitude of holes through which the gaseous combustible mixture flows from the inside to the outside of the tubular body. In service, the gas mixture burns on the exterior surface or near the exterior surface of the peripheral wall 5 of the tubular body 2.
  • the peripheral wall 5 of the tubular body 2 is cylindrical, c that is, the tubular body has a circular cross section. Although such a circular shape is the most rational for the burner, the cross section of the tubular body 2 could have other shapes, for example elliptical or polygonal.
  • the tubular body 2 could have a frustoconical shape, the large base of the truncated cone on the end side 3 and the small base being formed by the end wall 4.
  • the peripheral wall 5 of the tubular body 2 is constituted by two perforated sheets, namely an inner sheet 6 and an outer sheet 7.
  • the sheets 6 and 7 are kept intimately in contact with each other for example by several welding points.
  • the thickness e1 of the inner sheet 6, the diameter ⁇ 1 of the holes 8 of this sheet and the distance l1 between the axes of the adjacent holes 8 may have values identical to those of the inner sheet of the known burner described in the preamble.
  • e1 can be between 0.3 and 0.8 mm, preferably equal to 0.7 mm
  • ⁇ 1 can be equal to 0.8 mm
  • l1 can be equal to 1.5 mm.
  • the inner sheet 6 has a natural coefficient of passage of 25%.
  • the section for the passage of the holes 9 in the external sheet 7 is chosen so as to be smaller than the section for the passage of the holes in the external sheet of the known burner described in the preamble.
  • the distance l2 between the axes of the adjacent holes 9 is chosen so as to be greater than the distance between the axes of the adjacent holes of the external sheet of the known burner.
  • the interval d2 between two adjacent holes 9 in the external sheet 7 is greater than the corresponding interval in the external sheet of the known burner. More specifically, the spacing d2 of the holes 9 in the outer sheet 7 and their passage section are chosen such that all of the two sheets 6 and 7 have an overall coefficient of passage at most equal to 7.8%.
  • the holes 9 are preferably circular and have a diameter ⁇ 2 at most equal to 6 mm and a center distance l2 of between 8 and 10 mm.
  • the holes 9 of the outer sheet 7 have a smaller section and that their spacing d2 is increased relative to the known burner, the number of holes 8 of the inner sheet 6 which are exposed by the holes 9 is therefore smaller than in the known burner.
  • the same value of the flow rate of the air-gas mixture as in the known burner for a given supply pressure of the air-gas mixture therefore to obtain the same nominal power of the burner , it is necessary to increase the dimensions of the external peripheral surface 5 of the burner in order to increase the number of holes 8 which will be uncovered by the holes 9. This can be obtained without difficulty by increasing the external diameter and / or the length of the tubular body 2 of the burner 1.
  • the outer sheet 7 preferably has a thickness e2 markedly greater than that e1 of the inner sheet 6.
  • the thickness e2 of the outer sheet 7 is equal to 3 mm. From the point of view of the cooling of the outer sheet 7 therefore also of the cooling of the flames and consequently from the point of view of the reduction of the NOx rate, it would be advantageous if the thickness e2 of the sheet 7 was the most great possible.
  • the thickness e2 must be limited for economic reasons (cost of the sheet and tools capable of perforating thick sheets) and for mechanical reasons (the thickness e2 of the sheet must be less than the diameter ⁇ 2 of the holes 9 ).
  • the thickness e2 of the sheet 7 will be between 2.5 and 3.5 mm.
  • the diameter ⁇ 2 of the holes 9 cannot be less than the thickness e2 of the sheet 7. Consequently, when a thick sheet is used for the sheet 7, for example a sheet of 3 mm thick, the diameter ⁇ 2 of the holes 9 may not be less than approximately 4 mm.
  • the Applicant has produced a burner with a nominal power of 375 kWh constructed as described above and having the dimensional characteristics indicated in the table below.
  • This table also indicates, for comparison, the dimensional characteristics of a burner known from same power, used in boilers of the HX375 type manufactured by the applicant.
  • the NOx rates produced respectively by the burner according to the invention and by the known burner operating at the nominal power of 375 kWh have also been indicated.
  • the burner of the present invention produces more than three times less NOx than the known burner.
  • each hole has its center placed in the center of a circle and the adjacent holes which surround the hole in question have their center located on said circle and are distributed regularly over this circle with a constant angular spacing of 60 °.
  • the holes 9 do not necessarily have all the same diameter and they can therefore have different diameters provided that the overall coefficient of passage of the gases from the burner remains at most equal to 7.8%

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
EP94401336A 1993-06-21 1994-06-15 Gasbrenner mit niedrigem NOx-Ausstoss Withdrawn EP0631091A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9307463 1993-06-21
FR9307463A FR2706986B1 (de) 1993-06-21 1993-06-21

Publications (1)

Publication Number Publication Date
EP0631091A1 true EP0631091A1 (de) 1994-12-28

Family

ID=9448348

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94401336A Withdrawn EP0631091A1 (de) 1993-06-21 1994-06-15 Gasbrenner mit niedrigem NOx-Ausstoss

Country Status (2)

Country Link
EP (1) EP0631091A1 (de)
FR (1) FR2706986B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2037175B1 (de) 2007-09-12 2016-11-23 Polidoro S.p.A. Vormischbrenner
EP3910237A3 (de) * 2020-05-12 2022-02-23 Vaillant GmbH Brenneranordnung und verteilblech
IT202100011888A1 (it) * 2021-05-10 2022-11-10 Beckett Thermal Solutions S R L Membrana di combustione per un bruciatore a gas

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1955163A1 (de) * 1969-06-14 1971-05-13 Schwank Gmbh Mit Gas oder fluessigem Brennstoff betriebener Infrarotstrahler

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1955163A1 (de) * 1969-06-14 1971-05-13 Schwank Gmbh Mit Gas oder fluessigem Brennstoff betriebener Infrarotstrahler

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2037175B1 (de) 2007-09-12 2016-11-23 Polidoro S.p.A. Vormischbrenner
EP3910237A3 (de) * 2020-05-12 2022-02-23 Vaillant GmbH Brenneranordnung und verteilblech
IT202100011888A1 (it) * 2021-05-10 2022-11-10 Beckett Thermal Solutions S R L Membrana di combustione per un bruciatore a gas
EP4089328A1 (de) * 2021-05-10 2022-11-16 Beckett Thermal Solutions S.R.L. Verbrennungsmembran für einen gasbrenner

Also Published As

Publication number Publication date
FR2706986A1 (de) 1994-12-30
FR2706986B1 (de) 1995-09-01

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