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EP0190091B1 - Gas-Stabbrenner mit mechanischer Luftzuführung - Google Patents

Gas-Stabbrenner mit mechanischer Luftzuführung Download PDF

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Publication number
EP0190091B1
EP0190091B1 EP86440004A EP86440004A EP0190091B1 EP 0190091 B1 EP0190091 B1 EP 0190091B1 EP 86440004 A EP86440004 A EP 86440004A EP 86440004 A EP86440004 A EP 86440004A EP 0190091 B1 EP0190091 B1 EP 0190091B1
Authority
EP
European Patent Office
Prior art keywords
gas
air
injectors
distribution tube
tube
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
Application number
EP86440004A
Other languages
English (en)
French (fr)
Other versions
EP0190091A1 (de
Inventor
Michel Coulon
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.)
ALSACE GAZ INDUSTRIE SA
Original Assignee
ALSACE GAZ 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 ALSACE GAZ INDUSTRIE SA filed Critical ALSACE GAZ INDUSTRIE SA
Priority to AT86440004T priority Critical patent/ATE33068T1/de
Publication of EP0190091A1 publication Critical patent/EP0190091A1/de
Application granted granted Critical
Publication of EP0190091B1 publication Critical patent/EP0190091B1/de
Expired 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
    • F23D14/20—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 present invention relates to a linear gas and blown air burner, comprising several injectors arranged at the entrance to a combustion zone, an air distributor tube connected to a pressurized air supply, a gas distributor tube mounted inside the air distributor tube and connected to a pressurized gas supply, said injectors comprising a row of gas injectors distributed along the gas distributor tube and connected to this tube, and air injectors arranged coaxially around the gas injectors and connected to the air distributor tube, the gas injectors and the air injectors respectively comprising tubular elements fixed to the corresponding distributor tube, these respective elements being arranged coaxially so as to define an annular duct between them for the passage of air.
  • the power ratio of this type of burners is limited approximately to 1: 6 by the conditions of flame stability.
  • burners of the blown air type are used, in which the gas and the air are brought under pressure and are brought into contact at the end of an injector, at the entrance to the combustion zone. These burners can reach a power ratio going beyond 1: 20.
  • a linear ramp made up of such burners is particularly expensive and complex because it requires individual distribution of air to each burner, with corresponding command and control bodies. This complexity also affects the cost of maintenance.
  • the heat produced is not evenly distributed.
  • US Pat. No. 3,799,747 describes a device of the type indicated in the preamble, with a distribution tube of gas placed inside an air distributor tube and equipped with gas injectors extending coaxially in air injection tubes, fixed themselves on the air distributor tube.
  • This solution has the advantage of great ease of adjustment of the linear burner constituted by this injector rail, as well as great operational safety.
  • this device is difficult to adjust and maintain, because the gas injectors are difficult to access. It is therefore necessary to disassemble each injector before maintenance operations.
  • this device is not arranged to produce a continuous linear flame.
  • the present invention aims to remedy these drawbacks, by providing a linear burner of the type mentioned in the preamble, having a simple and economical construction, allowing great ease of maintenance and adjustment while ensuring a uniform distribution of heat and high operational safety.
  • the linear burner according to the invention is characterized in that one of the ends of the air distributor tube is connected to the pressurized air supply and its second end is closed by a removable plug, in that that the gas distributor tube comprises two support rods which are arranged parallel to the gas injectors and which are fixed by removable means to the wall of the air distributor tube, and in that the maximum transverse dimension of the gas distributor tube with the tubular elements of the gas injectors is less than the inside diameter of the air distributor tube, so as to allow the introduction and removal of the gas distributor tube with its injectors through the second end of the air distributor tube.
  • the maximum transverse dimension of the gas distributor tube with the entire gas injectors is less than the inside diameter of the air distributor tube.
  • Said removable means may comprise, for example nuts screwed onto the support rods and arranged outside the air distributor tube, so as to be easily accessible.
  • the linear burner according to the invention may comprise modular elements assembled end to end to constitute the air and gas distributor tubes. Burners of different sizes and powers can thus be produced from a small number of different parts.
  • the linear burner according to the invention comprises a flame guide constituted by an envelope surrounding the row of injectors and the combustion zone, this flame guide being mounted on the air distributor tube and being open only on the side opposite this tube.
  • the flame guide is advantageously made of refractory metal and it has support legs, these legs being held by screws on the air distributor tube or on elements integral with this tube. This method of fixing makes it possible to limit the transmission of heat and also allows different expansions of the flame guide and of the air distributor tube.
  • the flame guide delimits a linear combustion zone extending along the entire row of injectors
  • the flame has a linear shape, extending from one end to the other of the row of injectors.
  • the burner may comprise a single pair of ignition electrodes, mounted in the flame guide, approximately in the middle of the length thereof.
  • a flame control cell mounted at one end of the flame guide.
  • the burner comprises on the air supply a valve for adjusting the air flow, and a valve for adjusting the gas flow on the gas supply. It may further include a device for controlling the flow of gas to the air flow, by slaving the valve for adjusting the gas flow to the valve for adjusting the air flow and / or to a flow meter mounted on the gas supply.
  • the linear burner comprises an air distributor tube 1 consisting of a straight steel tube, the two ends of which are provided with flange connections. On its outer face, this tube carries a longitudinal row of air injectors 2, which are arranged in parallel and which each consist of a steel tube threaded at its lower end and screwed into a threaded hole in the wall of the tube air distributor 1.
  • the front end of the distributor tube 1 (on the right in FIG. 1) is closed by a plug 3 fixed to the flange of the tube 1 by bolts 4.
  • the other end of the tube 1 is connected, via a connection element 5, to an air supply line 6, comprising an adjustment valve (not shown). In service, line 6 is connected to a low pressure air source.
  • a gas distributor tube 8 constituted by a rectilinear steel tube, is mounted longitudinally inside the air distributor tube 1, opposite the air injectors 2. It carries a row of gas injectors 9 which correspond respectively to the air injectors 2 and which are arranged coaxially inside these.
  • the gas injectors 9 are screwed or welded into lateral orifices of the gas distributor tube 8, so as to receive the gas under pressure.
  • the gas distributor tube 8 extends substantially over the entire length of the air distributor tube 1. Its front end is closed by a plug 10. Its other end is located inside the connection element 5 and it is provided with a 90 ° elbow 11 which fits on a sleeve 12 mounted in the wall of the connection element 5 and connected to a gas supply pipe 13 provided with an adjustment valve (not shown ).
  • the gas distributor tube 8 is mounted parallel to the longitudinal axis 14 of the air distributor tube 1, but not necessarily in the coaxial position. It is supported and maintained in the appropriate position by means of two threaded rods 16 carrying nuts 17. These rods are placed respectively beyond each end of the row of injectors, parallel to these injectors, and each pass through a orifice in the wall of the tube 1. Thus, by acting on the nuts 17, one can adjust the position of the gas distributor tube 8 by moving it in the axial direction of the injectors. In doing so, the gas injectors 9 slide inside the air injectors 2. On the other hand, this method of attachment allows easy disassembly of the distributor tube 8 and the gas injectors 9, as will be described below. .
  • the burner further comprises a flame guide 20 constituted by a refractory metal casing surrounding the row of injectors 2 and 9 and delimiting a common combustion zone 21 opposite them.
  • the flame guide 20 has transversely a flared shape and it is fully open on the side opposite the air distributor tube, that is to say upwards in the position illustrated here.
  • the flame guide 20 has support legs 23 which are pressed against the air distributor tube 1 by claws 24, these claws being fixed to the tube 1 by screws 25 which are screwed into threaded bores in the wall of the tube 1.
  • This method of attachment allows both easy disassembly of the flame guide 20 and low heat transmission from the flame guide to the air distributor tube. It also makes it possible to have a joint between these two elements, if necessary. It also allows different expansions of the flame guide and the distributor tube 1.
  • the ignition of the gas and air mixture can be carried out by means of a single candle 26 disposed approximately in the middle of the length of the flame guide.
  • the spark plug 26 comprises in a known manner a body 27 and two electrodes 28 and 29.
  • the body 27 is screwed into a threaded bore through one of the side walls of the flame guide 20, in such a way that the electrodes 28 and 29 are located opposite a air / gas mixture injector.
  • the spark plug 26 is connected to a high voltage electrical supply 26 '.
  • the burner comprises a control cell 30, of a type known per se, which is connected by a cable 31 to the control device.
  • the control cell 30 is oriented along the longitudinal axis of the combustion zone 21. It is mounted inside a cooling tube 32 which is itself fixed, by through a threaded sleeve 33, to a tube 34 fixed in an end opening of the flame guide 20.
  • a quartz disk 35 is inserted inside the sleeve 33
  • the cooling tube 32 has air inlet holes 36 and a vertical vent 37, arranged so as to produce a natural circulation of air around the cell 30 when it heats up.
  • the flame control can also be ensured by an ionization electrode according to the usual method.
  • FIG 3 shows in more detail the embodiment of the air injectors 2 and gas 9 used in the linear burner described above.
  • the gas injector 9 comprises a steel tube 40, one end of which is screwed into a threaded orifice in the wall of the gas distributor tube 8.
  • a head 42 of known type comprising two elements 43 and 44 assembled by means of threads and between which is formed a circular slot 45 for the exhaust of the gas.
  • the relative arrangement of the injectors 2 and 42 allows a homogeneous mixture of air and gas.
  • the air injector 2 simply consists of a steel tube screwed into the wall of the air distributor tube 1.
  • the air injector 2 is arranged coaxially with the gas injector 9 , so that there remains between them an annular gap 46 for the passage of air.
  • a ring 47 provided with radial fins 48 of suitable shape is placed in the annular gap 46. This ring annular 47 is held in place by two respective shoulders of the tube 40 and of the head 42. It also serves as a centering member for the gas injector 9 in the air injector 2.
  • the construction described above of the burner according to the invention is particularly simple and can be produced from inexpensive elements which are currently commercially available.
  • the tubes used to make the distribution tubes 1 and 8, as well as the tubular elements 2 and 40 of the injectors are preferably steel tubes of a standard series.
  • the heads 42 of the gas injectors 9 can be elements existing on the market.
  • the burner described above is arranged to allow very easy disassembly of the distributor tube 8 and the gas injectors fixed thereon.
  • the length of the tubular elements 40 of the gas injectors (FIG. 3) is determined in such a way that the maximum transverse dimension of the block constituted by the gas distributor tube 8 and the tubular elements 40 is less than the inside diameter of the tube. air distributor 1.
  • the linear burner according to the invention can be controlled by the known means used to control the point burners.
  • a device is provided for controlling the gas flow control valve to the air flow control valve, as well as possibly to a flow meter mounted on the gas supply, upstream of the valve. adjustment.
  • This servo device is arranged to maintain a constant ratio between the gas flow and the air flow, in order to obtain optimal combustion. In this way, the power of the burner can be adjusted by acting only on the air flow control valve.
  • FIG. 4 shows in cross section an embodiment with some modifications compared to the example described above.
  • the general arrangement of the elements is unchanged, but the shape and the method of fixing the injectors, the flame guide and the spark plug are different.
  • the gas distributor tube 8 carries gas injectors 49 which are shorter than in the previous case and which comprise a tubular element 50, screwed onto the tube 8, and a head 52 similar in principle to the head 42 described above.
  • An air injector 60 is formed by a tubular element provided at its base with a flange 61 which makes it possible to simply position the injector 60 fitted into a bore 62 of the wall of the air distributor tube 1.
  • the flanges 61 d a row of air injectors 60 are maintained on each side of the burner by a clamping profile 63 fixed to the tube 1 by bolts 64.
  • the interior of the air injector 60 has a shoulder 65, intended to retain a turbulence washer 57 in the annular duct 56 delimited by the two injectors, and a flared upper part 66 which is extended by the flame guide 70 surrounding the combustion zone 71.
  • the flame guide is provided with support legs 73 which are tightened on the profiles 63 by means of screws 74. Thus, the heat transmission from the flame guide 70 to the tubes 1 and 8 is very reduced.
  • the flame guide is equipped with an adjustable support 75 for an ignition electrode 76 and for an ionization electrode 77, in place of the spark plug 26 mentioned above.
  • the gas injector 49 is short enough so that the maximum transverse dimension H of the block constituted by the gas distributor tube 8 and the complete injectors 49 is smaller than the inside diameter of the air distributor tube 1 and therefore allows the entire row of injectors 49 to be extracted directly through the tube 1.
  • the disassembly of the air injectors 60 is also particularly easy.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Gas Burners (AREA)

Claims (10)

1. Gas-Stabbrenner mit mechanischer Luftzuführung, bestehend aus mehreren am Beginn einer Verbrennungszone angeordneten Düsen, einem an eine Druckluftleitung angeschlossenen Luftverteilrohr (1), einem im Inneren des Luftverteilrohres montierten und an eine Druckgasleitung angeschlossenen Gasverteilrohr (8), wobei die Düsen eine Reihe von entlang des Gasverteilrohres verteilte und mit diesem Rohr verbundene Gasdüsen (9, 49) umfassen, und koaxial um die Gasdüsen herum angeordnete und am Luftverteilrohr angeschlossene Luftdüsen (2, 60), und wobei die Gasdüsen und die Luftdüsen jeweils rohrförmige Bauteile aufweisen (2, 40, 50, 60), die am jeweiligen Verteilrohr befestigt sind und diese jeweiligen Bauteile koaxial so montiert sind, daß zwischen ihnen ein ringförmiger Kanal (40, 56) für den Durchlaß von Luft begrenzt ist,
dadurch gekennzeichnet, daß eines der Enden des Luftverteilrohres (1) an die Druckluftversorgung (6) angeschlossen und sein zweites Ende mit einem abnehmbaren Deckel (3) verschlossen ist, daß das Gasverteilrohr zwei Tragebolzen (16) aufweist, die parallel zu den Gasdüsen angeordnet und durch demontierbare Elemente (17) an der Wand des Luftverteilrohres befestigt sind und daß die maximale Querabmessung des Gasverteilrohres (8) mit den rohrförmigen Bauteilen (40, 50, 52) der Gasdüsen kleiner ist, als der Innendurchmesser des Luftverteilrohres, so daß der Einbau und der Ausbau des Gasverteilrohres mit seinen Düsen von dem zweiten Ende des Luftverteilrohres her durchführbar ist.
2. Stabbrenner nach Anspruch 1,
dadurch gekennzeichnet, daß die maximale Querabmessung (H ) des Gasverteilrohres (8) mit den Gasdüsen (49) insgesamt kleiner als der innere Durchmesser des Luftverteilrohres (1) ist.
3. Stabbrenner nach Anspruch 1,
dadurch gekennzeichnet, daß die
demontierbaren Elemente Schraubenmuttern (17) aufweisen, die auf die Haltebolzen aufgeschraubt und außerhalb des Luftverteilrohres angeordnet sind.
4. Stabbrenner nach Anspruch 1,
dadurch gekennzeichnet, daß er zum Aufbau
der Verteilrohre (1,8) bausteinartige,
aneinandergebaute Elemente aufweist.
5. Stabbrenner nach Anspruch 1,
dadurch gekennzeichnet, daß er eine Flammenführung (20, 70) aufweist, die aus einer die Düsenreihe und die Brennzone umgebenden Ummantelung besteht, daß diese Flammenführung auf dem Luftverteilrohr (1) montiert ist und daß sie nur auf der vom Rohr abgewandten Seite offen ist.
6. Stabbrenner nach Anspruch 5,
dadurch gekennzeichnet, daß die Flammenführung aus hitzebeständigem Metall besteht und Abstützungspratzen (23, 73) aufweist, wobei diese Pratzen durch Schrauben auf dem Luftverteilrohr (1) oder auf mit diesem Rohr verbundenen Elementen (63) festgehalten sind.
7. Stabbrenner nach Anspruch 5,
dadurch gekennzeichnet, daß er im Flammenhalter, ungefähr auf dessen halber Länge ein einziges Zündelektrodenpaar (28, 29, 76, 77) aufweist.
8. Stabbrenner nach Anspruch 5,
dadurch gekennzeichnet, daß er, an einem Ende des Flammenhalters montiert, eine Zelle (30) zur Kontrolle der Flamme aufweist. 9. Stabbrenner nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß er in der Luftzuführleitung (6) ein Ventil für die Regulierung der Luftdurchsatzmenge und in der Gaszuführleitung (7) ein Ventil für die Regulierung der Gasdurchsatzmenge aufweist.
10. Stabbrenner nach Anspruch 9,
dadurch gekennzeichnet, daß er eine Vorrichtung aufweist zur Anpassung des Gasdurchsatzes an den Luftdurchsatz, durch Nachlaufsteuerung der Stellung des Ventils zur Regulierung des Gasdurchsatzes an die Stellung des Ventils zur Regulierung des Luftdurchsatzes und/oder an einen in der Gaszuführleitung eingebauten Durchsatzmesser.
EP86440004A 1985-01-15 1986-01-14 Gas-Stabbrenner mit mechanischer Luftzuführung Expired EP0190091B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86440004T ATE33068T1 (de) 1985-01-15 1986-01-14 Gas-stabbrenner mit mechanischer luftzufuehrung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8500621A FR2576087A1 (fr) 1985-01-15 1985-01-15 Bruleur lineaire a gaz et a air souffle
FR8500621 1985-01-15

Publications (2)

Publication Number Publication Date
EP0190091A1 EP0190091A1 (de) 1986-08-06
EP0190091B1 true EP0190091B1 (de) 1988-03-16

Family

ID=9315360

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86440004A Expired EP0190091B1 (de) 1985-01-15 1986-01-14 Gas-Stabbrenner mit mechanischer Luftzuführung

Country Status (4)

Country Link
EP (1) EP0190091B1 (de)
AT (1) ATE33068T1 (de)
DE (1) DE3660038D1 (de)
FR (1) FR2576087A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4671765A (en) * 1986-02-19 1987-06-09 Ppg Industries, Inc. Burner design for melting glass batch and the like
FR2641601A1 (fr) * 1989-01-06 1990-07-13 Coulon Michel Bruleur lineaire a gaz ayant une largeur reglable

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR957032A (de) * 1950-02-13
US2626656A (en) * 1947-04-16 1953-01-27 De Witt H Wyatt Gas burner and internal baffle for gas distribution
US3170443A (en) * 1963-04-29 1965-02-23 Eclipse Fuel Eng Co Inter-tube gas burner for a coal or oil-fired waterwall boiler
US3799747A (en) * 1968-04-27 1974-03-26 Metallgesellschaft Ag Fuel burner system for a fluidized bed
DE1903622B2 (de) * 1969-01-24 1974-06-20 Vits-Maschinenbau Gmbh, 4018 Langenfeld Kreuzstrombrenner für gasförmigen Brennstoff
US4403947A (en) * 1981-08-12 1983-09-13 Eclipse, Inc. Gas mixing burner

Also Published As

Publication number Publication date
ATE33068T1 (de) 1988-04-15
FR2576087A1 (fr) 1986-07-18
DE3660038D1 (en) 1988-04-21
EP0190091A1 (de) 1986-08-06

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