EP0193838B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Burner disposition for combustion installations, especially for combustion chambers of gas turbine installations, and method for its operation
Assignee: Siemens AG
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Filing: 1986-02-24
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Granted: 1989-05-03
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Expires: 2006-02-24
Abstract
Abstract In a combustion chamber having a flame tube therein at an annular gap from a housing of the chamber, a burner apparatus including at least one pilot burner near an end face of the flame tube for generating a pilot flame from natural gas and/or heating oil, an air supply channel surrounding the head of the pilot burner, a premixing device for natural gas in the form of a ring channel system surrounding the head including flow conduction walls defining an inflow cross section at an air inflow side of the ring channel system open toward the annular gap for conducting a majority of combustion air from the annular gap to a combustion zone developing downstream of the burner head in the flame tube, the combustion air having flow vectors with components entering the combustion zone in directions from parallel to the burner axis to an acute angle to the burner axis, the combustion air components having swirl components superimposed thereon tangentially relative to the burner axis acting as a swirl center, a multiplicity of nozzle tubes penetrating the inflow cross section in a direction substantially transverse to the flow direction, the nozzle tubes each having a side with nozzle openings facing away from the air inflow side of the ring channel system, and a natural gas feeding system substantially concentrically surrounding the pilot burner and connected to one end of each nozzle tube, and a method of operating the same.
Inventors
- 👤 Helmut Maghon
- 👤 Bernard Dr. Becker
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 06:00
CPC Classifications
F; F02; F02C; F02C3/00; F02C3/20; F02C3/30; F23; F23C; F23C7/00; F23C7/002; F23C7/004; F23D; F23D14/00; F23D14/02; F23D17/00; F23D17/002; F23L; F23L7/00; F23D2900/00; F23D2900/00008
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
337 words
Burner arrangement (B) for furnaces, especially of gas turbine installations, whereby a combustion chamber (BK) has an approximately cylindrical housing (1) and a fire pipe (2) therein held centrally and able to be moved by heat transfer with an annular gap (So); the burner arrangement (B) consisting of at least one pilot burner (PB) producing a pilot flame, said burner being arranged in the front area of the fire pipe (2) and which is able to be driven by natural gas (E) and/or fuel oil (H) as fuel and has an air supply channel (16), and of an annular channel system (R) surrounding the head (3) of the pilot burner (PB) with flow guiding walls (r1, r2) for supply of the main portion of combustion air from the annular gap (So) to the combustion zone forming upstream of the burner head (3) in the fire pipe (2), whereby a twist blading (13) is present in the annular channel system (R), by which components are able to be impressed upon the flow vectors of the combustion air, which flow into the combustion zone, directed in a parallel to acute- angled manner to the burner axis (b) and are superimposed upon the tangentially directed twist components with the burner axis (b) as twist centre, characterised in - that the annular channel system (R) is constructed with its flow guiding walls (r1, r2) as premixing burner-arrangement (VM) for combustion of natural gas (E), - that for this purpose the flow cross-section (5) of the annular channel system (R) open to the annular gap (So) is penetrated by a plurality of nozzle tubes directed approximately transverse to the air flow (L), - that the nozzle tubes (9) are attached at one of their ends to a natural gas supply system (EZ), which surrounds the pilot burner (PB) approximately concentrically, - and that the nozzle openings of the nozzle tubes (9) are arranged on the side nozzle tubes (9) facing away from the air supply side of the annular channel system (R).
Claim 2
Dependent Claim
337 words
Burner arrangement (B) for furnaces, especially of gas turbine installations, whereby a combustion chamber (BK) has an approximately cylindrical housing (1) and a fire pipe (2) therein held centrally and able to be moved by heat transfer with an annular gap (So); the burner arrangement (B) consisting of at least one pilot burner (PB) producing a pilot flame, said burner being arranged in the front area of the fire pipe (2) and which is able to be driven by natural gas (E) and/or fuel oil (H) as fuel and has an air supply channel (16), and of an annular channel system (R) surrounding the head (3) of the pilot burner (PB) with flow guiding walls (r1, r2) for supply of the main portion of combustion air from the annular gap (So) to the combustion zone forming upstream of the burner head (3) in the fire pipe (2), whereby a twist blading (13) is present in the annular channel system (R), by which components are able to be impressed upon the flow vectors of the combustion air, which flow into the combustion zone, directed in a parallel to acute- angled manner to the burner axis (b) and are superimposed upon the tangentially directed twist components with the burner axis (b) as twist centre, characterised in - that the annular channel system (R) is constructed with its flow guiding walls (r1, r2) as premixing burner-arrangement (VM) for combustion of natural gas (E), - that for this purpose the flow cross-section (5) of the annular channel system (R) open to the annular gap (So) is penetrated by a plurality of nozzle tubes directed approximately transverse to the air flow (L), - that the nozzle tubes (9) are attached at one of their ends to a natural gas supply system (EZ), which surrounds the pilot burner (PB) approximately concentrically, - and that the nozzle openings of the nozzle tubes (9) are arranged on the side nozzle tubes (9) facing away from the air supply side of the annular channel system (R).
Claim 3
Dependent Claim
45 words
Burner arrangement according to claim 1, characterised in that the natural gas supply system (EZ) has an annular inlet chamber (10) with a connecting wall (10.1) for the nozzle tubes (9) angled in a tapering manner to the axis (b) of the pilot burner (PB).
Claim 4
Dependent Claim
104 words
Burner arrangement according to claim 2, characterised in that the annular channel system (R) of inner and outer flow guiding walls (r1, r2) is restricted, said walls lying at least approximately in each case on a cone shaped shell, the cone axes of which coincide with the axis (b) of the pilot burner (PB) and which are displaced axially against each other in the direction of the pilot burner axis, and that the connecting wall (10.1) of the inlet chamber (10) inclined in a tapering manner is equiaxial with the inner cone- shaped flow guiding wall (r1) or at least partly coincides with this.
Claim 5
Dependent Claim
40 words
Burner arrangement according to claim 3, characterised in that the inlet chamber (10) is arranged in the ring recess, which is set by a cylinder wall (12) coaxially surrounding the pilot burner (PB) and the inner flow guiding wall (r1).
Claim 6
Dependent Claim
37 words
Burner arrangement according to one of claims 1 to 4, characterised in that the twist blading (13) is downstream of the nozzle tubes (9) whereby the blade longitudinal axes extends approximately parallel to the nozzle tubes axes.
Claim 7
Dependent Claim
162 words
Burner arrangement according to one of claims 1 to 5, characterised in that the pilot burner (PB) has with its central burner pipe (30) serving the supply of fuel oil (H) a first burner shell (31) surrounding the burner pipe with an annular space (14) for feeding natural gas (E), which opens in the region of the burner head (3) by way of a nozzle wall (32) into the flow space (33) of a twist star (4) on the burner head side and a second burner shell in the form of the outer cylinder wall (12), which forms a second burner- coaxial annular space, the air supply channel (16) of the pilot burner (PB) which also terminates in the flow space (33) of the twist star (4) on the burner head side and serves the supply of air, as well as openings (7 or 8) for feeding an inert material, preferably of water (W) or water vapour (D) into the combustion zone.
Claim 8
Dependent Claim
68 words
Burner arrangement according to one of claims 2 to 4, characterised in that the inlet chamber (10) runs continually in a tapered manner helicoidally from a larger initial cross-section attached to the natural gas feeding line (11) up to a smaller end cross-section, whereby at the end cross-section of the inlet chamber (10) the last of the admitting nozzle tubes (9) of the nozzle tube ring is attached.
Claim 9
Dependent Claim
51 words
Burner arrangement according to one of the preceding claims, characterised in that for supplying gas for the pilot burner (PB) several separately fed and controlled gas inlets (37; 39), distributed over the circumference, in the air supply channel (16) thereof are present upstream at a distance from the twist star (4).
Claim 10
Dependent Claim
37 words
Burner arrangement according to claim 8, characterised in that the gas inlets (37; 39) consist of several tubes (35) distributed over the circumference and led through the wall (12 or 31) of the air supply channel (16).
Claim 11
Dependent Claim
22 words
Burner arrangement according to claim 9 characterised in that the tubes (35) project a portion (36) into the air supply channel (16).
Claim 12
Dependent Claim
33 words
Burner arrangement according to claim 10, characterised in that the tube portions (36) have, within the air supply channel (16) several gas outlet openings (37), preferably approximately perpendicular to the air flow direction.
Claim 13
Dependent Claim
44 words
Burner arrangement according to claim 8, characterised in that the gas inlets (34) are constructed as bores (39) through the wall (12 or 31) of an annular channel (38) arranged concentrically to the air supply channel, said channel having a separate gas line (40).
Claim 14
Dependent Claim
73 words
Method of operating a burner arrangement, according to one of claims 1 to 12, characterised in that when operating in the vicinity of the design point a quantity of water (W) or water vapour (D), between 50% and 120% of the amount of fuel of the pilot burner (PB), preferably 100%, is fed in so that a large portion as possible of this is present in the flame of the pilot burner (PB).
Claim 15
Dependent Claim
61 words
Method of operating a burner arrangement according to one of claims 8 to 12, characterised in that the ratio of fuel to air at the pilot burner (PB) is altered depending on the load, when the gas supply is altered upstream and distanced from the twist star (4) into the air supply channel (16), depending on the whole amount of fuel.
Claim 16
Dependent Claim
58 words
Method according to claim 14, characterised in that with a decreasing whole amount of fuel, increasingly amounts of gas are fed into the air supply channel (16), in order to stabilise the flame of the whole burner arrangement by controlled inhomogeneity, whereby the pilot burner (PB) functions with an approximate air count of 2 = 1.4 ± 0.4.
Claim 17
Dependent Claim
54 words
Method according to claim 14, characterised in that close to the design point the amount of gas fed in is adjusted such that at the outlet of the pilot burner (PB) there results an approximately even mix with approximately the same air coefficient (2 = 1.8 ± 0.4) as in the outer main flow.
References Cited (Backward Citations)
No citation records indexed.
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