DE1501868B2

DE1501868B2 - BURNERS FOR FLOWABLE FUELS

Info

Publication number: DE1501868B2
Application number: DE19661501868
Authority: DE
Inventors: Robert v Dipl Ing Linde Joachim v Dr 8032 Grafelfing Kurz German 8000 München Linde
Original assignee: Individual
Current assignee: Individual
Priority date: 1966-02-21
Filing date: 1966-02-21
Publication date: 1973-02-22
Also published as: GB1156427A; DE1501868A1

Description

3 43 4

der Brennstoffdüse 2 ein konisches Mischrohr 3 an- nal 8 tangential einmündet. Um eine tangentiale Einschließt, das in eine Brennkammer 4 mündet. Das strömung der Luft in das Mischrohr 3' zu erhalten, Mischrohr 3 weist einen nach außen sich erstrecken- sind in die Öffnungen 14 Leitschaufeln 16 eingesetzt, den Flansch 5 auf, in dem öffnungen 6 angebracht die tangentiale Kanäle bilden. Die zur Umfangswand sind. Die Umf angswand 13 des Mischrohres 3 enthält 5 13 tangential einströmende Luft strömt schraubenlieine Luftzufuhröffnung 7, in die ein Luftzufuhrka- nienförmig entlang der Umf angswand 13 in Richtung nal 8 tangential einmündet. Die durch die Luftzu- auf die Brennkammer 4, da sie durch den Deckel 11 fuhröffnung 7 in das Mischrohr 3 eintretende Luft daran gehindert ist, in der anderen Richtung zu ströströmt auf Grund ihrer tangentialen Einströmrich- men. Die Abgasrückführung erfolgt in gleicher Weise tung und der konischen Form des Mischrohres 3 an io wie bei F i g. 1 durch den durch die Luftströmung erdessen Umf angswand 13 schraubenlinienförmig in zeugten Sog.A conical mixing tube 3 opens tangentially at the fuel nozzle 2 at 8. To include a tangential which opens into a combustion chamber 4. To get the flow of air into the mixing tube 3 ', Mixing tube 3 has an outwardly extending guide vanes 16 are inserted into the openings 14, the flange 5, in which openings 6 attached form the tangential channels. The one to the perimeter wall are. The peripheral wall 13 of the mixing tube 3 contains 5 13 tangentially inflowing air flows helically Air supply opening 7, into which an air supply channel in the shape of a circumference along the peripheral wall 13 in the direction of nal 8 opens tangentially. The through the air to the combustion chamber 4, since it through the cover 11 drive opening 7 in the mixing tube 3 entering air is prevented from flowing in the other direction due to their tangential inflow. The exhaust gas recirculation takes place in the same way device and the conical shape of the mixing tube 3 on io as in FIG. 1 by the air flow instead Circumferential wall 13 helically in generated suction.

Richtung auf die Brennkammer 4, wobei in der Mitte Die Ausführung gemäß F i g. 5 unterscheidet sichDirection towards the combustion chamber 4, with the embodiment according to FIG. 5 differs

des Mischrohres 3 ein Sog erzeugt wird, durch den von derjenigen nach F i g. 3 im wesentlichen nur da-of the mixing tube 3 a suction is generated through which the one according to FIG. 3 essentially only because

Abgase aus der Brennerkammer 4 durch die Öffnun- durch, daß ein zylindrisches Mischrohr 17 ohne Ab-Exhaust gases from the burner chamber 4 through the opening so that a cylindrical mixing tube 17 without exhaust

gen 6 und den Ringraum 9 zwischen dem Misch- 15 schlußdeckel verwendet ist und daß eine nur zurgene 6 and the annular space 9 between the mixing 15 key cover is used and that one only for

rohr 3 und dem Brennergehäuse 1 in das der Brenn- Brennkammer 4 hin gerichtete schraubenförmigetube 3 and the burner housing 1 in the direction of the combustion chamber 4 helical

kammer 4 abgewandte Ende des Mischrohres 3 ein- Luftströmung im Mischrohr 17 dadurch erreichtChamber 4 facing away from the end of the mixing tube 3 an air flow in the mixing tube 17 is thereby achieved

gesaugt werden. Diesen zurückgeführten Abgasen wird, daß die Begrenzungswände der Luftzufuhröff-be sucked. These recirculated exhaust gases will ensure that the boundary walls of the air supply opening

wird der Brennstoff mittels der Düse 2 zugegeben. nungen 14', die wiederum mit Leitschaufeln 16 ver-the fuel is added through the nozzle 2. openings 14 ', which in turn are provided with guide vanes 16

Das Brennstoff-Abgasgemisch vermischt sich beim 20 sehen sind, schräg zur Längsmittelachse des Misch-The fuel-exhaust gas mixture mixes when you see 20, obliquely to the longitudinal center axis of the mixing

Durchgang durch das Mischrohr 3 mit der Luft, so rohres in Richtung auf die Brennkammer 4 zu ge-Passage through the mixing tube 3 with the air so that the tube is directed in the direction of the combustion chamber 4

daß spätestens am brennraumseitigen Ende des neigt sind.that at the latest at the end of the combustion chamber tends to be.

Mischrohres 3 ein brennbares Gemisch vorhanden Während in den vorangegangenen Beispielen die ist, das durch eine Zündkerze 10 gezündet wird. Luftzufuhröffnung(en) in der Umfangswand des Bei der Ausführung gemäß F i g. 3 und 4 ist das 25 Mischrohres angeordnet ist bzw. sind, zeigen F i g. 6 Mischrohr 3' zylindrisch und es weist an seinem von und 7 eine Ausführung, bei der der Luftzufuhrkader Brennkammer 4 abgewandten Ende einen Deckel nal 8' in eine Öffnung 18 einmündet, die im Deckel 11 auf, der eine Abgaszufuhröffnung 12 enthält, de- 11 des Mischrohres 3' vorgesehen ist, welcher das ren Querschnitt geringer ist als der Querschnitt des von der Brennkammer 4 abgewandte Ende des in die Brennkammer 4 einmündenden Endes des 30 Mischrohres 3' abschließt. Die Einströmung der Luft Mischrohres 3'. In der Umfangswand 13 des Misch- erfolgt wiederum tangential zur Umfangswand 13 rohres sind mehrere gleichmäßig über den Umfang und außerdem schräg zur Längsmittelachse des verteilte Luftzufuhröffnungen 14 vorgesehen. Im Be- Mischrohres 3', wodurch sich ebenfalls eine schraureich dieser Öffnungen ist das Mischrohr 3' von einer benförmige Luftströmung entlang der Umfangswand Ringkammer 15 umgeben, in die der Luftzufuhrka- 35 13 zur Brennkammer 4 hin ergibt.Mixing tube 3, a combustible mixture is present While in the previous examples the which is ignited by a spark plug 10. Air supply opening (s) in the peripheral wall of the In the execution according to FIG. 3 and 4, the mixing tube is or are arranged, show FIG. 6th Mixing tube 3 'cylindrical and it has on its of and 7 a design in which the air supply cadre Combustion chamber 4 facing away from the end of a lid nal 8 'opens into an opening 18 in the lid 11, which contains an exhaust gas supply opening 12, of which 11 of the mixing tube 3 'is provided, which the Ren cross-section is smaller than the cross-section of the end facing away from the combustion chamber 4 The end of the mixing tube 3 ′ which opens into the combustion chamber 4 closes off. The influx of air Mixing tube 3 '. In the circumferential wall 13 of the mixer takes place again tangentially to the circumferential wall 13 tube are several evenly around the circumference and also obliquely to the longitudinal center axis of the distributed air supply openings 14 are provided. In the mixing tube 3 ', which also creates a scary of these openings, the mixing tube 3 'is surrounded by a ben-shaped air flow along the circumferential wall Surrounding annular chamber 15, into which the Luftzufuhrka- 35 results in 13 to the combustion chamber 4 out.

Hierzu 2 Blatt ZeichnungenFor this purpose 2 sheets of drawings

Claims

1 to create 2 burners according to the main patent, which is characterized by a simpler structure and in which the recirculation of the exhaust gases with less air t

1. Burner for flowable fuels is achieved with imprint and effort,
gas recirculation from a subsequent combustion chamber, whereby before the fuel is mixed, the fuel is added through a nozzle res to form a helical flow of recirculated exhaust gas near the nozzle-side end of the mixing tube with the air At least one air supply duct tangentially into which the mixing tube opens in the jet direction of the fuel nozzle.

Mixing tube opening into the combustion chamber it is provided that a nozzle is coaxial with the fuel area of the central axis of the mixing tube arranged supply opening for the backward suction generated by the fuel guided exhaust gases and a feed opening for the mixed exhaust gas through the preferably coaxial to Having air which are arranged so that the central axis of the mixing tube arranged exhaust gas to exhaust gases with the added fuel and the 15 drive opening sucks.

Air blows the mixing tube in the direction of the jet There are known burners in which a tangential

According to patent 1,220,544, a gaseous medium flows into the fuel nozzle characterized in that a combustion chamber is provided close to it. With a nozzle-side The end of the mixing tube (3, 3 ', 17) was known to vibrating burners (Belgian patent specification to form a helical stream 20 643 503) is opened by a tangential At least one air supply duct (8, 8 ', 16) air duct sucked in air. A helical one opens tangentially into the mixing tube. Air flow cannot enter here. At a

2. Burner according to claim 1, characterized known gas burner (German patent shows that the air supply duct (8 or 16) in 476 721) the gas enters the combustion chamber tangentially the circumferential wall (13) of the mixing tube (3, 3 ', 25, while the combustion air through essentially 17) joins. borrowed radial channels is fed. This is supposed to

3. Burner according to claim 1, characterized in that the gas that is on the inside is that the air supply channel (8 ') sweeps along a wall of the combustion chamber, quickly and Wall (11) opens, which mixes the combustion chamber intensively with the air. A helical one mer (4) remote end of the mixing tube (3 ') 3 ° flow could at best with the help of the chimney draft concludes. come about, so would not itself create a suction

4. Generate burner according to "one of claims 1 to 3. However, the suction through the chimney draft would be characterized in that the mixing tube (3 ', completely inadequate for the purpose of the invention. 17) a plurality of over its scope A suggestion for the pre-uniform according to the invention distributed air supply openings (14, 35 blow, through a tangential introduction of the Ver-14 ') having, the combustion air provided with guide vanes (16) a helical flow and which form the tangential channels. thus creating a suction through the exhaust gases

returned to a subsequent combustion chamber

are, through these well-known burners every-

40 if not given.
... The air supply channel preferably opens into the

The subject of the main patent is a burner for the peripheral wall of the mixing tube. However, it can also open into flowable fuels with exhaust gas recirculation in a wall which closes the combustion chamber connected to the combustion chimney, with the end of the mixing tube facing away from the mer. In both cases, when the fuel is mixed with the air from the fuel, several air supply openings distributed evenly over the material through a nozzle can be added to the recirculated exhaust gas circumference of the mixing tube, in which the fuel nozzle with guide vanes is provided in the direction of the jet the combustion chamber opens, which form the tangential channels,
of the mixing tube, is provided, which is a coaxial to some embodiments of the invention

Fuel nozzle arranged supply opening for the 5 ° in the following with reference to the drawings recirculated exhaust gases and a feed opening for explained. It shows

the air, which are arranged so that the F i g. 1 a first embodiment of an inventive

Exhaust gases with the added fuel and the moderate oil burner in longitudinal section in schematic Air the mixing tube in the beam direction of the burning representation,

pass fabric nozzle. In the exemplary embodiments 55 F i g. 2 shows a section along line II-II in FIG. 1, of the main patent, the ab- F i g. 3 a second version, also in

gases by injector effect with the help of a mixed longitudinal section,

nozzle that has an inner cavity and an outer Fig. 4 a section along line IV-IV in

Has annular gap, wherein the through the outer F i g. 3,

Air supplied to the annular gap, the exhaust gases through the in 60 Fig.5 a modification of the embodiment according to neren cavity sucks. In order to achieve a sufficient ■ Fig. 3,.

To achieve the appropriate injector effect, a relative- F i g. 6 another version, also in

moderately high air pressure is required because of the longitudinal section, and

Required deflections of the air flow losses Fig.7 shows a section along line VII-VII in

ste are inevitable. In addition, the 65 Fig. 6.

Mixing nozzle has a relatively complicated structure. First, reference is made to FIGS.

Burner. men. In the burner housing is a fuel

The invention is based on the object of arranging a nozzle 2, which is located in the jet direction