Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
  • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
  • F23R3/007—Continuous combustion chambers using liquid or gaseous fuel constructed mainly of ceramic components
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
  • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
  • F23R3/42—Continuous combustion chambers using liquid or gaseous fuel characterised by the arrangement or form of the flame tubes or combustion chambers
  • F23R3/60—Support structures; Attaching or mounting means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
  • F23M2900/00—Special features of, or arrangements for combustion chambers
  • F23M2900/05002—Means for accommodate thermal expansion of the wall liner
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
  • F23R2900/00—Special features of, or arrangements for continuous combustion chambers; Combustion processes therefor
  • F23R2900/03041—Effusion cooled combustion chamber walls or domes

Definitions

• the present invention relates to a support ring for heat shield elements of a flame tube, in particular a flame tube of a gas turbine.
• the invention relates to a combustion chamber arrangement with a flame tube and a mixing housing, as it finds particular use in gas turbines.
• Support rings for heat shield elements may have a groove extending on its outer side, which serves as a cooling air passage.
• a section of a support ring according to the prior art is shown in Figure 1, wherein the support ring is received by the Zinnenkranz a mixing housing.
• the figure shows a section of the support ring 1 and a section of a peg 3 of a mixing housing in a schematic cross-sectional view.
• the support ring has a reinforced portion 5, which in turn is provided with an inner groove 7 and an outer groove 9, both of which extend over the full circumference of the support ring.
• the outer groove 9 and the inner groove 7 are radial over a number
• the outer groove 9 forms a fresh air supply for cooling the support ring 1.
• the fresh air is then passed through the holes 11 into the combustion chamber interior.
• the reinforced area 5 also forms a flange-like projection projecting toward the interior of the combustion chamber, which forms a support for heat shield elements.
• Object of the present invention is to provide an advantageous support ring and an advantageous combustion chamber arrangement available that allow in particular, the
• a flame tube in particular a gas turbine flame tube
• at least one groove is present in the outside of a support ring according to the invention for Hitzschildiata .
• This has a relation to the radial direction of the support ring obliquely extending groove wall. Suitable angle between see the surface normal of the oblique groove wall to the radial direction of the support ring are in particular in the range between 30 ° and 60 °.
• the oblique groove wall leads when grinding the Zinnenkranzes a mixing housing in the support ring that forms a wedge-shaped projection in the pinnacles. This has one of the oblique groove wall corresponding wedge surface.
• passage openings may be located in the region of the groove which extend from the outside of the support ring to its inner side and serve as cooling air openings for cooling the support ring and for removing cooling air introduced through the groove.
• the groove wall opposite the oblique groove wall may have a non-planar geometry. In particular, it may form a curved surface in the axial direction of the support ring.
• a wear-resistant layer hard-facing, wear-resistant layer
• a combustion chamber arrangement according to the invention has a flame tube and a mixing housing. It can be used in particular in gas turbines.
• the flame tube has an output end with a support ring for heat shield elements, in particular for ceramic heat shield elements.
• the mixing housing has an edge with protruding pinnacles, wherein the pinnacles form a receiving portion for receiving the support ring.
• the Support ring designed as a support ring according to the invention.
• the armor of the pinnacles can be harder than the armor of the support ring.
• the armor can also be the same, or the armor of the support ring may be harder than the armor of the battlements.
• the armor of the pinnacles is harder than that of the support ring, since a mending and replacing the support ring in comparison to a repair or replacement of battlements represents less effort.
• a demolition of pinnacles with the same armor is more likely than damage to the support ring and has for the gas turbine, the critical consequences.
• the hardness of the armor it is thus possible to control the distribution of wear on the support ring and the pinnacles.
• Figure 1 shows a section of a support ring in a crenellated ring according to the prior art.
• Figure 2 shows the detail of Figure 1 after an operational grinding of the Zinnenkranzes in the support ring
• Figure 3 shows a combustion chamber arrangement according to the invention with flame tube and mixing housing in a schematic representation.
• Figure 4 shows a section of the transition between the flame tube and mixing housing in an enlarged sectional view.
• FIG. 5 shows a section along the line V-V in FIG. 4.
• FIG. 6 shows the support ring and the battlements of the mixing housing after operational grinding.
• FIG. 7 shows a diagram with the forces occurring during cooling of the combustion chamber arrangement.
• a combustion chamber arrangement according to the invention which has a support ring according to the invention for heat shield elements, also called stone support ring, will be described below with reference to FIGS. 3 to 7.
• the present embodiment shows a combustion chamber arrangement in which the flame tube is arranged vertically, i. the axial direction of the flame tube extends in the vertical direction. Accordingly, the radial directions of the flame tube make horizontal
• FIG. 3 shows the combustion chamber arrangement, which has a flame tube 101 with a burner end 103, on which the burners (not illustrated) are arranged, and an outlet end 105, from which the hot gases arising in the combustion chamber occur, in a sectional view.
• the flame tube 101 is with its outlet end 105 in a receptacle 109 of a
• the mixing housing passes the hot gases leaving the flame tube 101 to the turbine (not shown).
• the interior of the flame tube 101 is provided with ceramic heat shield elements, also called heat shield stones, to protect the combustion chamber wall from the corrosive hot gas.
• ceramic heat shield elements also called heat shield stones
• At the exit end of the flame tube 101 is the heat arranged holding plates 111 holding the stone support ring 113, of which a substantial part in the receptacle 109 of the mixing housing 107 is located.
• the receiving section 109 and the stone supporting ring 113 are shown in enlarged detail in FIG.
• the stone support ring 113 has an outer side 115 and an inner side 117. Both in the outside 115, and in the inside 117 grooves 119, 121 are present, which extend over the entire circumference of the stone support ring 113.
• the outside of the stone support ring 113 is also provided with an abrasion-reducing armor 129.
• At regular intervals distributed around the circumference of the stone support ring 113 through holes 123 are present, which connect the groove 119 in the outer side 117 (hereinafter called outer groove 119) with the formed in the inner side 117 groove 121 (hereinafter referred to as inner groove 121) fluidly connect.
• the outer groove 119 serves as a cooling air passage, which allows the distribution of cooling air around the stone support ring 113 around.
• the cooling air can then pass from the outer groove 119 through the through holes 123 in the inner groove 121 and from there into the combustion chamber interior.
• the outer groove 117 and the inner groove 121 are disposed in a flange-like protrusion 122 protruding radially toward the combustion chamber interior.
• the upper surface 124 of the projection 122 forms a support surface for the lowermost row of the heat shield elements 111 (see FIG. 3).
• the outer groove 119 of the stone support ring 113 has an inclined groove wall 125 with respect to the radial direction of the stone support ring 113.
• the surface normal of the oblique groove wall 125 includes with the radial direction of the support ring 113 an angle between 30 ° and 60 °. In the present embodiment, the angle is about 40 °.
• the oblique groove wall 125 opposite groove wall 127 has a non-planar geometry and is curved in the present embodiment in the axial direction of the support ring 113.
• FIG. 5 A section through the stone support ring 113 along the line V-V in Figure 4 is shown in Figure 5. It can be seen in this NEN that the through holes 123 do not extend in the radial direction of the support ring 113, but are inclined in the circumferential direction and include an angle of about 60 ° with the radial direction.
• the stone support ring 113 of the flame tube 101 is inserted into the receiving portion 109 of the mixing housing 107.
• This receiving portion 109 is formed by pinnacles 133, which are formed in the wall 131 of the mixing housing.
• the pinnacles 133 are in this case formed by a wall section of the mixing housing, which is penetrated by circumferentially distributed around the mixing housing recesses or recesses. These recesses or recesses extend from the edge of the peripheral wall, starting substantially in the axial direction of the flange into the peripheral wall.
• the receiving section 109 is given an increased flexibility with respect to the wall section of the mixing housing 107 which is not provided with the recesses or recesses, so that forces occurring between the mixing housing 107 and the flame tube 101 can be compensated to a certain extent.
• the inner sides 135 of the pinnacles 133 are planar and provided with an armor 137.
• the armor 137 of the merlons is harder than the armor 129 of the outside 115 of the stone support ring 113, so that occurring during operation abrasion caused by friction of the stone support ring 113 on the inside of the pinnacles 133, to a large extent on the stone support ring 113 concentrated.
• Figure 6 shows a section of the stone support ring 113 and the receiving portion 109 when the combustion chamber assembly has reached a certain operating time.
• the Zinnenkranz of the mixing housing 107 grinds into the stone support ring 113 of the flame tube 101, if no previous findings and replacement or repair takes place. This condition is shown in FIG.
• the grinding creates a projection 139 in the pinnacles 133, which protrudes into the outer groove 119, that is, into the cooling air passage.
• this projection 139 has an oblique side 141 which is largely parallel to the oblique groove wall 125.
• the oblique groove wall 125 and the oblique side 141 created during grinding in the projections 139 of the pinnacles thus lead to a bevelled contact surface in relation to the radial direction and the axial direction of the two components, which uses or generates the forces generated by transient movement of the components with temperature changes ., converts the components independently of each other, ie, they are pushed apart, and the forces that occur do not cause any consequential damage, such as tearing of battlements, deformation, etc.
• a force diagram showing the movement caused by transient force Ftransient and the force exerted on the flame tube resultant force F and the resulting resu it.Fi the mixing housing resu force F is it.Mi represents ⁇ Darge in FIG. 7
• the curved side 127 of the outer groove 119 in the stone support ring 113 also causes even with considerable wear and an associated deep digging of the pinnacles 133 in the outer groove 119 of the stone support ring 113 always given a sufficiently large cooling air passage for the stone support ring is. An obstruction of thedeluftpasssage can be avoided.
• the groove wall 127 opposite the inclined groove wall 125 is curved
• the groove wall can be roof-shaped, that is to say with two planar wall sections which meet one another at an angle. In the simplest case, this can be realized by a rectangular in cross-section groove is introduced at an angle relative to the radial direction of the stone support ring 113 in the outside 115.
• the angle which the groove encloses with the radial direction is in this case preferably in the range between 30 ° and 60 °. In order to avoid blockage of the cooling air passage by a deeper incorporation of the battlements (abandoned by a longer operation), they can be introduced beyond the height of the possible incorporated batt in the support ring.
• the stone support ring is provided in the region of the groove (cooling air supply) with a slope (for example 40 °, but the slope is variable and functionally selected), which has a forced demolition of mixing housing and stone support ring result in cooling of the components.
• a slope for example 40 °, but the slope is variable and functionally selected

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Turbine Rotor Nozzle Sealing (AREA)
• Combustion Of Fluid Fuel (AREA)
• Portable Nailing Machines And Staplers (AREA)
• Gas Burners (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

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Citations (4)

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• 2008
  • 2008-10-23 PL PL08842468T patent/PL2201299T3/pl unknown
  • 2008-10-23 EP EP08842468A patent/EP2201299B1/de active Active
  • 2008-10-23 RU RU2010121163/06A patent/RU2478881C2/ru active
  • 2008-10-23 WO PCT/EP2008/064333 patent/WO2009053417A2/de active Application Filing
  • 2008-10-23 AT AT08842468T patent/ATE509236T1/de active
  • 2008-10-23 CN CN2008801132621A patent/CN101855497B/zh active Active

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