Kraftstoffdüse and diffusion point for it.

State of the art the invention concerns a diffusion point for a Treibstoffd0se for use in gas turbines. In particular the invention concerns a diffusion point configuration and adjustments to their K0hlung.

In a gas turbine Treibstoffd0sen are used, in order to mix air and fuel for the spa.teren burn stromabw RTS. W hrend starting is used a diffusion mode for the stable burn, until the Vormischmodus can be used for the lowering of the NOx emissions. The diffusion point of the box must make a mechanism available, in order to produce when starting the diffusion flame, and k0hl enough remain, in order to resist a Besch digung by hot incineration gases w hrend the Vormischmodus. Gegenw rtige Designs use air, which is branched off from the artery to the K0hlung of the diffusion point, which an uncertain K0hlstrom/Hauptstrom-Verh ltnis and a complicated current way to the consequence hat.

A conventional diffusion point 10 becomes in Fig. 1 illustrates. As there shown, the gegenwa.rtige Design divides the air curtain 12 in Brennerrohr-K0hlluft 14, diffusion air 16 and showering head air 18. As is to be inferred from the channel represented as phantom view, the Diffusionssp011uft does not stromt into the showering head section 22. The current allocation and therefore the effective K0hlung in the three circles 14, 16, 18 can vary on the basis of the input conditions, and which K0hlung of the point (by Duschkopfluft-Effusionsk0hlung) cannot do in unabh ngige way ge is ndert. As shown, the configuration of Fig uses. 1 a multiplicity of L6chern 24, around the Effusionsk0hlung in the diffusion point durchzuf0hren. In traps with high thermal and/or structural load k6nnen this Lecher as tension strong places works, which to verk0rzter life span and cracking f0hrt. In addition k6nnen permit this Lecher the entering of incineration gases the Diffusionsk0hlkreis, if the pressure of the incineration gas is Iokal h6her as the pressure in the Diffusionsk0hlkreis.

Short description of the invention the invention schl gt the use of a dedicated K0hlkreises forwards, around the diffusion point with lower partial number and smaller Komplexit t to k0hlen. That is, the suggested Design uses one unabh ngigen K0hlkreis, around the point with diffusion fuel or Sp011uft for k0hlen. In order the K0hlwirkung to erhohen, can be planned an impact plate. Therefore the invention in a Treibstoffd0se ausgef0hrt can become, comprehensively: a burner tubing component; a D0senkern, which is concentrically arranged in this burner tubing component; a VormischStromungskanal, which is arranged between the burner tubing component and the D0senkern; a diffusion point, whereby this diffusion point exhibits an extent wall, which is fastened to the D0senkern, an essentially unperforated Endwand at out serums an axial end of this extent wall, at least one C) ffnung, which is defined to the axial Endwand to the extent extent neighbouring, and a diffusion point coat, which is arranged in surrounding relationship with the extent wall and is fastened to this core, in order to define a K0hlluft-StrSmungskanal between them whereby those stands at least a Offnung with at least one of this K0hlluft-StrSmungskanal and a R0ckf0hrungszone behind the diffusion point in StrSmungsverbindung; and a diffusion fuel channel, that in the D0senkern defined is and outside at an inside of the essentially unperforated Endwand endet.

The invention can become also in a diffusion point for a Treibstoffd0se ausgef0hrt, comprehensively: an extent wall, an essentially unperforated Endwand at out serums an axial end of this extent wall, at least a Offnung, which are defined to the axial Endwand to the extent extent neighbouring, and a diffusion point coat, which are arranged in surrounding relationship with the extent wall, in order to define a K0hlluft-Stromungskanal between them whereby these at least a Offnung with at least one of this K0hlluft-StrSmungskanal and a R0ckf0hrungszone behind the diffusion point in StrSmungsverbindung steht.

Short description of the designs these and other tasks and advantages of this invention come out from the following ausf0hrlichen description of the gegenwartig preferred exemplary Ausf0hrungsformen of the invention, in connection with the enclosed designs, how:

Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig.

a schematic cross section opinion of a conventional diffusion point is; a schematic cross section opinion of a diffusion point after a Ausf0hrungsform of the invention is; a pulled apart perspective opinion of a diffusion point and a coat is; a vergrSsserte perspective opinion is, which illustrates the attachment of the Ausseren of end of the coat at the diffusion point; and one) sserte perspective opinion is vergrt, those assembled building group from coat and diffusion point zeigt.

AusfLihrliche description of the invention the available invention makes a building group available from worked on and poured parts, which permits w&hrend the diffusion enterprise the injection of fuel into the gas turbine. W hrend the Vormischbetriebs permits the singular arrangement of the characteristics to the erfindungsgema.ssen diffusion point of these to become effectively gek0hlt and thus a high Zuverl ssigkeitsgrad too erreichen.

Compared with Fig. 1 is in Fig. 2 the multiplicity of LSchern, which are conventionally intended, in order to reach the Effusionsk0hlung of the diffusion point, invention in accordance with ASS omitted, whereby the suggested Design exhibits no such Lecher as Spannungsverst&rkungsquelle and the R0cklauf is essentially impossible. Instead of its is unperforated the central section 122 of the diffusion point 110 and C) ffnungen 124 is intended, in order to let through the D0senbetrieb according to Diffusionssp011uft or diffusion fuel and unite with the air curtain, that only with 112 inside the diffusion point coat 128 and then with 116 at the diffusion point strSmt.

It is to be marked that those off now gene 124 essentially C) ffnungen corresponds, those in the structure of Fig. 1 for the Diffusionssp01ung intended are, around it with 16 with the air curtain too vereinen.

In the represented exemplary Ausf0hrungsform is fastened an impact plate 130 in beabstandeter parallel relationship with the unperforated central section 122 of the Endwand of the diffusion point 110. The impact plate 130 covers one or more Prall6ffnungen 132 for hitting Rome e.g. at Diffusionssp011uft for and against the inside of the central section 122.

As also in Fig. represented, this exemplary Ausf0hrungsform in the prallluftgek0hlten diffusion point the K0hlung amplifier a rkendes characteristic exhibits 2. That is, a gekra.uselte, curved R0ckseite is intended, as shown with 134. This characteristic amplifier rkt the K0hlung, by it the Oberfl the che R0ckseite vergrSssert and/or K0hlstrom swirls after the impact. Instead of the gekra.uselten, curved R0ckseite shown the K0hlung can be verst&rkt by ribs, FI0gel, pins or such a thing. How erw&hnt above, a multiplicity of C is) ffnungen 124 at the extent of the prallluftgek0hlten inside along arranged, in order to unite the Diffusionssp011uft with the air curtain, that concentrically to it strSmt.

In an exemplary Ausf0hrungsform also a heat barrier layer is 136 on the front of the diffusion point hinzugef0gt, like in Fig. 2 schematically represented. A TBC coating of the class B sch0tzt the point before temperature gradients and erhSht the K0hlleistung of the R0ckseite.

The conventional Design, that in Fig. 1 is shown, consists of three parts, which become together gel constant from haste X bar worked on and then. The invention, e.g. in Fig. 2, consists of only one of haste X bar worked on part and used instead of repeated soldered connections a welded through seam is illustrated. Thus a erfindungsgem&sses diffusion point Design reduces the number of the parts and L6tverbindungen and erm6glicht Wirbell6cher with Auskehlungen.

How is to be seen, the simplified diffusion point Design and the Str6mungswege, which are intended invention in accordance with ss, result in as in the exemplary Ausf0hrungsform von Fig. 2 shown, the same StrSmungsgeometrie as the current diffusion point Design for the diffusion enterprise. But strSmen instead of a part of the air curtain by a perforated diffusion point final side to leave, as in the Design of Fig. 1, becomes the point final side protecting the Vormischung on the R0ckseite with Diffusionssp011uft prallluftgek0hlt, and the whole air curtain 112 is let through to diffusion 116 and Brennerrohrk0hlung 114. The diffusion point Design uses also diffusion fuel, around the R0ckseite of the diffusion point for k0hlen, whereby the average metal temperature is in Diffusionsund steered Vormischmodus much k0hl, e.g. only 100°F more warmly as the Diffusionstreibstofftemperatur.

A further characteristic of the invention in accordance with ss the coat 128 and the point hold themselves redundant way mutually in front and in the back zur0ck. That is, Fig. 3 shows the coat, which is pulled apart by the remainder of the diffusion point. To the R0ckhaltemerkmal accordingly a multiplicity of wedges is 160 for the usseren end of the coat 128 neighbouring, but defines of this beabstandet. Even if into the represented Ausf0hrungsform a multiplicity of wedges is intended, the optimization of the production probably to fewer wedges than shown f0hren, perhaps 3 to 6 on full 360 the degree partial extent. As shown, the range of the &usseren end of 122 of the diffusion point exhibits a multiplicity of slots 162, which are defined in it, and which are wedges 160 beabstandet, in order to slide by the respective groove, if the coat on the diffusion point is pushed in, as in Fig. 4 represented. As soon as the coat is fully eingef0hrt, in order to stand with the box in the interference, as in Fig. 5 represented, is arranged the wedges directly before the outer circumference of the point end of 122. By tricks of the coat, as shown by the arrow R, the wedges 160 regarding the slots 162 are then shifted, whereby they are aligned with the diffusion point structure, the front R0ckhalt to gewa.hrleisten. Meanwhile is keilfSrmig into these exemplary Ausf0hrungsform the ussere end of the coat, as with 164 shown, around the rear R0ckhalt too gew hrleisten. The parts become then at their front seam 166 zusammengelStet.

The diffusion point 110 the Ausf0hrungsform of the invention is not abhangig from characteristics of the Design for the equilibrium of the Treibstoffd0se and can from there into different Treibstoffd0sen of the type be integrated, the one burner pipe, one concentrically in the burner pipe arranged D0senkern, one between the burner pipe and the D0senkern defined Vormisch-Str6mungskanal and one in the D0senkern defined diffusion fuel channel exhibits. In an exemplary Ausf0hrungsform the diffusion point can be in a Treibstoffd0se of the type intended, which is represented in the US patent specification No. 6,438,961, their revealing by this reference herein taken up wird.

Even if the invention in connection with were described, what is regarded gegenw rtig as the most practical and preferential Ausf0hrungsform, it understands itself the fact that the invention is beschrankt on the revealed Ausf0hrungsform not, but on the contrary different modifications and includes &quivalente arrangements, those to the spirit and extent of the enclosed AnsprDche liegen.

Patentanspr iche 1st diffusion point (110) f0r a Treibstoffd [Jse, comprehensively:

an extent wall, an essentially unperforated Endwand (122) at a usseren axial end of this extent wall, at least a Offnung (124), which to the extent extent neighbouring to the axial Endwand is defined, and a diffusion point coat (128), which surrounds in the relationship with the extent wall is arranged, in order to define a K0hlluft-Str6mungskanal between them whereby these at least a Offnung (124) with at least one of this K0hlluft-Str6mungskanal (112, 116) and a R0ckf0hrungszone behind the diffusion point in Str6mungsverbindung steht.

2. Diffusion point fDr a Treibstoffd0se according to requirement 1, whereby the inside of the essentially unperforated Endwand is swirling (134), around their K0hlung too verbessern.

3. Diffusion point far a Treibstoffd0se according to requirement 1, in addition comprehensively a heat barrier layer (136), those on a front exterior of the Endwand arranged ist.

4. Diffusion point far a Treibstoffd0se according to requirement 1, in addition comprehensively a perforated impact plate (130), those in beabstandeter, parallel relationship with the inside of the essentially unperforated Endwand arranged is, whereby this impact plate at least a Offnung (132) f0r the K0hlmedienstrom hitting against the inside of the essentially unperforated Endwand (122) definiert.

Diffusion point far a Treibstoffd0se according to requirement 4, so developed and arranged that the river after the impact by those at least a Offnung (124) to the extent extent str6mt.

6. Diffusion point f [Jr a Treibstoffd0se according to requirement 4, whereby in the impact plate (130) only one percussion opening (132) defines ist.

7. TreibstoffdiJse, comprehensively:

a burner roughly rkomponente; a DfJsenkern, which is concentrically arranged inside this burner tubing component; a Vormisch-Str6mungskanal, which is arranged between the burner tubing component and the D0senkern; a diffusion point (110) according to requirement 1, whereby the diffusion point coat (128) is fastened to this core (166), in order to define a Kuhlluft water tunnel between them; and a diffusion fuel channel, that in the D0senkern defined is and outside at an inside of the essentially unperforated Endwand endet.

8. TreibstoffdiJse according to requirement 7, in addition is comprehensively a perforated impact plate (130), those in beabstandeter, parallel relationship with the inside of the essentially unperforated Endwand (122) arranged, whereby this impact plate at least a Offnung (132) f0r the river at diffusion fuel or SpLilluft, hitting against the inside of the essentially unperforated Endwand, definiert.

9. TreibstoffdiJse according to requirement 8, so developed and arranged that the river after the impact by those at least a Offnung (124) to the extent extent str6mt.

TreibstoffdiJse according to requirement 8, whereby in the impact plate only one Prall6ffnung (132) defines ist.

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