EP0479174B1 - Tête de combustion pour brûleurs à gaz - Google Patents

Tête de combustion pour brûleurs à gaz Download PDF

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Publication number
EP0479174B1
EP0479174B1 EP91116622A EP91116622A EP0479174B1 EP 0479174 B1 EP0479174 B1 EP 0479174B1 EP 91116622 A EP91116622 A EP 91116622A EP 91116622 A EP91116622 A EP 91116622A EP 0479174 B1 EP0479174 B1 EP 0479174B1
Authority
EP
European Patent Office
Prior art keywords
combustion
air
gas
distributors
inner tubular
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
EP91116622A
Other languages
German (de)
English (en)
Other versions
EP0479174A2 (fr
EP0479174A3 (en
Inventor
Flavio Pastorato
Luciano Bianchini
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.)
RBL Riello Bruciatori Legnago SpA
Original Assignee
RBL Riello Bruciatori Legnago SpA
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 RBL Riello Bruciatori Legnago SpA filed Critical RBL Riello Bruciatori Legnago SpA
Publication of EP0479174A2 publication Critical patent/EP0479174A2/fr
Publication of EP0479174A3 publication Critical patent/EP0479174A3/en
Application granted granted Critical
Publication of EP0479174B1 publication Critical patent/EP0479174B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
    • F23D14/36—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air in which the compressor and burner form a single unit
    • 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
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • 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
    • F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2207/00—Ignition devices associated with burner

Definitions

  • the invention concerns a combustion head for gas burners, particularly suited for gas combustion.
  • the presence of these duct systems within the combustion head entails also the inconvenience of creating within the combustion head itself high load losses on the gas side, which cause the reduction of the combustion head power, when the pressure in the pipeline is low.
  • a combustion head of a gas burner which, in accordance with the main patent claim is fed by a blower unit connected with an external tube-shaped body through a manifold flange conveying the combustion air and comprising:
  • the distributors protrude axially in relation to the front end of the outer tube-shaped body and are divided into two ranges, one range being intermediate. It is in this intermediate range that the combustion with an excess of air occurs and it is formed by a pair of distributors obtained in the junction area between the front end of the inner tubular duct and the rear end of the stub pipe. The other range is at the terminal end and it is in this range that the combustion with a defective amount of air occurs. It consists of a single distributor positioned near the front end of the stub pipe.
  • the main advantage obtained with the combustion head according to the invention is a decrease of pollution caused by nitric oxides and, because of the low load losses, it can also be used in those cases, when the gas pressures in the pipelines are low.
  • Another advantage consists in the possibility of producing burners with a higher application flexibility, thanks to the higher modulation ratio which it is possible to obtain with the combustion head of the invention.
  • Another advantage consists in that the particular radial conformation of the distributors permits to obtain a flame developing in the radial direction, so that this head can be used with the purpose of obtaining high thermal powers even in boilers presenting combustion chambers with limited lengths.
  • the head manufactured according to the dictates of the invention yields also the advantage that it can conveniently be used also in room heaters, thanks to the essentially radial arrangement of the flame.
  • the gas combustion head according to the invention is indicated as a whole with 1, and it consists of an external tube-shaped body 2, which is connected with the blower unit 3 of a burner, which is indicated as a whole with 4, through a manifold flange 5.
  • an inner tubular duct 6 which is attached to the manifold flange 5 by means of an elbow sleeve 7 applied at the rear end 16.
  • the intermediate tubular body 8 is comprised between the outer tube-shaped body 2 and the inner tubular duct 6 and it is co-axial with them.
  • Said intermediate tubular body 8 is attached to the manifold flange 5 by mechanical fastening means, such as, for instance, the screws 9, which make it possible to adjust its position along the direction of the longitudinal axis 10 of the combustion head 1.
  • Combustion air 12 is let through the rear opening 11 of the manifold flange 5 into the intermediate tubular body 8. Moreover, a gas/air mixture 14 or gas alone is let into the inner tubular duct 6 through the opening 13, at the bottom of the manifold flange 5, which communicates with the interior of the elbow sleeve 7.
  • a stub pipe 40 is present in the front part of the inner tubular duct 6.
  • This stub pipe 40 presents a rear end 41 with an annular disc 36 attached to it and a front end 42 with a circular disc 23 attached to it by means of the spacer 24.
  • the annular disc 36 of the stub pipe 40 is attached to another annular disc 35, which, in turn, is connected with the front end 17 of the inner tubular duct 6, through the spacers 53 and the fastening screws 33, while between said annular discs 35 and 36 there is an intermediate annular disc 32.
  • the distributor 31 is formed between the intermediate annular disc 32 and the annular disc 35, while the distributor 51 is formed between the intermediate annular disc 32 and the annular disc 36, belonging to the stub pipe 40.
  • the distributor 21, constituting the range of end-distributors 21 is formed between the front end 42 of the stub pipe 40 and the circular disc 23.
  • the flame front splits up and generates two combustion areas differing from each other, wherein the combustion of one area occurs with an excess of air, while the combustion of the other area occurs with a defective amount of air. More specifically, the combustion corresponding to the range 30 of the distributors occurs with an excess of air, while the combustion corresponding to the distributor range 20 occurs with a defective amount of air.
  • the products resulting from the combustion with an excess of air - the direction of their flow being indicated by arrow 44 - are re-cycled following the direction of arrow 44.
  • the air flow 45 streaming out of the intermediate tubular body 8 within the outer tube-shaped body 2 can be adjusted by suitably changing the axial position of the intermediate tubular body 8 along axis 10, so as to change its distance 43 from the outlet end of the outer tube-shaped body 2.
  • the combustion head according to the invention achieves the division of the flame front and the subsequent re-cycling of the combustion products with an ensuing completion of the combustion process, thereby achieving a considerable reduction of the nitric oxide component in the exhaust fumes.
  • the distributors 31, 51 and 21 are formed by placing face to face and co-axial with each other the discs 35 and 36 and an intermediate disc 32 comprised between the first two and by placing a disc 23 in front of and co-axial with the front end 42 of the stub pipe 40. It is understandable that these distributors generate low load losses of the flow of the air-gas mixture or of the gas, which flows into them and which comes from the inner tubular duct 6, so that the gas combustion head according to the invention also fulfills the purpose of achieving in the gas area load losses which are lower than those occurring in combustion heads presenting the same characteristics and wherein the combustion occurs with a division of the flame front.
  • the combustion chamber according to the invention presents the following advantages: a decreased pollution factor, the possibility of being used even with low gas pressures in the pipeline, a higher flexibility of application and also a simplified manufacturing process with the resulting advantage of decreased manufacturing costs.
  • the combustion head according to the invention presents a flame with an essentially radial development, it can be used also in room heaters for the heating of storage rooms, drying rooms and similar.
  • the combustion head according to the invention may undergo changes and modifications concerning some of its specific constructive components.
  • the distributors present in each range can be one or more according to the constructive needs or to the type of performance required from the head.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
  • Combustion Of Fluid Fuel (AREA)

Claims (5)

  1. Tête de combustion pour un brûleur à gaz alimenté par une unité soufflante (3), branchée à un corps tubulaire extérieur (2) par le moyen d'un collecteur à bride (5) convoyant l'air de combustion (12) et comprenant:
    - une buse tubulaire intérieure (6), placée co-axiale à l'intérieur du corps tubulaire extérieur (2) et attachée au collecteur à bride (5) et dans laquelle un mélange air/gaz ou gaz seulement est convoyé;
    - des distributeurs (51, 31, 21) de sortie du mélange air/gaz ou gaz suelement (14) placés sur la partie frontale de la buse tubulaire intérieure (6);
    - un corps tubulaire intermédiaire (8), co-axial soit avec le corps tubulaire extérieur (2), qu'avec la buse tubulaire intérieure (6) et compris dans leur lame d'air, attaché par des moyens mécaniques (9), qui permettent le réglage de sa position en direction co-axiale (10);
    - au moins un élément d'ignition de la flamme (15);
    caractérisé en ce que les distributeurs (51, 31, 21) permettant la sortie du melange gaz/air ou gaz seulement de la buse tubulaire intérieure (6) sont des espaces annulaires perpendiculiers à l'axe de la buse tubulaire intérieure (6), formés par des bagues (35, 36, 32) et/ou par des disques (23) qui sont co-axiaux l'un à l'autre et connectés ensemble par des entretoises (33, 24) et/ou par le moyen d'au moins un tronçon de tuyau (40).
  2. Tête de combustion selon la revendication 1, caractérisé en ce que les distributeurs (51, 31, 21) saillient axiallement en rélation à l'extrémité frontale du corps tubulaire extérieur (2).
  3. Tête de combustion selon la revendication 1 ou 2, caractérisé en ce que les distributeurs (51, 31, 21) sont partagés entre deux rangs, l'un desquels est un rang intermédiaire (30), dans lequel se produit une combustion avec un excès d'air et il consiste en au moins un distributeur (51, 31) obtenu près de la zone de jonction entre l'extrémité frontale (17) de la buse tubulaire intérieure (6) et l'extrémité derrière (41) du tronçon de tuyau (40), et l'autre est un rang d'extrémité (20) dans lequel se produit une combustion avec une quantité déficiente d'air et il consiste en un autre distributeur (21) obtenu près de l'extrémité frontale (42) du tronçon de tuyau (40).
  4. Tête de combustion selon la revendication 3, caractérisé en ce que les distributeurs (51, 31) appartenant au rang intermédiaire (30) sont un couple de distributeurs et ils sont formés par un disque annulaire intermédiaire (32) compris entre deux autres disques annulaires (35, 36) avec lesquels il est joint par le moyens d'entretoises (53).
  5. Tête de combustion selon la revendication 3, caractérisé en ce que le distributeur (21) appartenant au rang d'extrémité (20) est un distributeur singulier formé par un disque circulaire (23) attaché co-axiallement par le moyen d'entretoises (24) à l'extrémité frontale (42) du tronçon de tuyau (40).
EP91116622A 1990-10-02 1991-09-30 Tête de combustion pour brûleurs à gaz Expired - Lifetime EP0479174B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8562290 1990-10-02
IT08562290A IT1243147B (it) 1990-10-03 1990-10-03 Testa di combustione per bruciatori a gas

Publications (3)

Publication Number Publication Date
EP0479174A2 EP0479174A2 (fr) 1992-04-08
EP0479174A3 EP0479174A3 (en) 1992-09-23
EP0479174B1 true EP0479174B1 (fr) 1994-07-06

Family

ID=11329152

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91116622A Expired - Lifetime EP0479174B1 (fr) 1990-10-02 1991-09-30 Tête de combustion pour brûleurs à gaz

Country Status (3)

Country Link
EP (1) EP0479174B1 (fr)
DE (1) DE69102747D1 (fr)
IT (1) IT1243147B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6443728B1 (en) * 2001-03-19 2002-09-03 Alstom (Schweiz) Ag Gas pipe ignitor
CN108317544B (zh) * 2018-02-08 2019-12-31 佛山市顺德区吉孚电器有限公司 一种中餐式燃气炒菜灶
CN108332238B (zh) * 2018-02-08 2020-09-08 吴联凯 一种中餐式燃气灶

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH303030A (de) * 1952-08-15 1954-11-15 Bbc Brown Boveri & Cie Gasbrenner, vorzugsweise für Brennkammern von Gasturbinenanlagen.
GB1440071A (en) * 1972-06-01 1976-06-23 Nu Way Heating Plants Ltd Gas burners
DE2233627B2 (de) * 1972-07-08 1976-05-13 Körting Öl- und Gasfeuerung GmbH, 3000 Hannover Gasbrenner
DE2548790A1 (de) * 1975-10-31 1977-05-05 Gaswaerme Inst E V Brennerkopf fuer gas-geblaesebrenner fuer alle gasarten
WO1984001205A1 (fr) * 1982-09-16 1984-03-29 Mc Gill Inc Bruleur a paroi radiante

Also Published As

Publication number Publication date
DE69102747D1 (de) 1994-08-11
IT9085622A0 (it) 1990-10-03
IT1243147B (it) 1994-05-24
EP0479174A2 (fr) 1992-04-08
EP0479174A3 (en) 1992-09-23
IT9085622A1 (it) 1992-04-03

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