EP0335978A1
Expired / Lapsed
EP
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Gas turbine combustor
Assignee: Hitachi Ltd
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Filing: 1988-08-31
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Granted: —
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Expires: 2008-08-31
Abstract
Abstract This invention relates to a gas turbine combustor of a premixing combustion system in which a fuel and the air are mixed and burnt, consisting of a cylindrical main nozzle provided on an upstream end wall of a cylindrical combustion chamber, an auxiliary nozzle formed around the main nozzle, a main premixed gas supply means for supplying a premixed gas to the main nozzle, and an auxiliary premixed gas supply means for supplying a premixed gas, the excess air ratio of which is smaller than of the main premixed gas, to the auxiliary nozzle. Owing to this arrangement, a lean premixed gas having an excess air ratio larger than 1 can be burnt stably under low to high loads of a gas turbine. ABSTRACT A gas turbine combustor of the pre-mixed combustion system in which the fuel and the air are burned being mixed in advance. The gas turbine combustor comprises main cylindrical nozzles provided in the end wall on the upstream side of a cylindrical combustion chamber, auxiliary nozzles formed to surround the main nozzles, main pre-mixed gas supply means for supplying a pre-mixed gas to the main nozzles, and auxiliary pre-mixed gas supply means for supplying a pre-mixed gas having an air ratio smaller than that of the main pre-mixed gas to the auxiliary nozzles, and wherein it is allowed to stably burn a lean pre-mixed gas having an air ratio of greater than 1 from a low-load condition through up to a high-load condition of the gas turbine.
Inventors
- 👤 Yasuo Iwai
- 👤 Shigeru Azuhata
- 👤 Kenichi Sohma
- 👤 Kiyoshi Narato
- 👤 Hironobu Kobayashi
- 👤 Tooru Inada
- 👤 Tadayoshi Murakami
- 👤 Norio Arashi
- 👤 Yoji Ishibashi
- 👤 Michio Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 12:24
CPC Classifications
F; F23; F23D; F23D23/00; F23D14/00; F23D14/26; F23R; F23R3/00; F23R3/28; F23R3/286
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
87 words
A gas turbine combustor comprising a cylindrical combustion chamber (20), a plurality of main cylindrical nozzles (14) provided in the end wall on the upstream side of said combustion chamber, auxiliary nozzles (15) formed around the circumference of said main nozzles, main pre-mixed gas supply means (17, 18) for supplying a pre-mixed gas to said main nozzles (14), and auxiliary pre-mixed gas supply means (31) for supplying a pre-mixed gas having an air ratio smaller than that of said main pre-mixed gas to said auxiliary nozzles (15).
Claim 2
Dependent Claim
87 words
A gas turbine combustor comprising a cylindrical combustion chamber (20), a plurality of main cylindrical nozzles (14) provided in the end wall on the upstream side of said combustion chamber, auxiliary nozzles (15) formed around the circumference of said main nozzles, main pre-mixed gas supply means (17, 18) for supplying a pre-mixed gas to said main nozzles (14), and auxiliary pre-mixed gas supply means (31) for supplying a pre-mixed gas having an air ratio smaller than that of said main pre-mixed gas to said auxiliary nozzles (15).
Claim 3
Dependent Claim
82 words
A gas turbine combustor comprising cylindrical main nozzles (14) provided in the end wall on the upstream side of a cylindrical combustion chamber (20), auxiliary nozzles (15) formed around the circumference of said main nozzles (14), main pre-mixed gas supply means (17, 18) for supplying a pre-mixed gas to said main nozzles (14), and auxiliary pre-mixed gas supply means (31) for supplying a pre-mixed gas of an air ratio smaller than that of said main pre-mixed gas to said auxiliary nozzles (15).
Claim 4
Dependent Claim
82 words
A gas turbine combustor comprising cylindrical main nozzles (14) provided in the end wall on the upstream side of a cylindrical combustion chamber (20), auxiliary nozzles (15) formed around the circumference of said main nozzles (14), main pre-mixed gas supply means (17, 18) for supplying a pre-mixed gas to said main nozzles (14), and auxiliary pre-mixed gas supply means (31) for supplying a pre-mixed gas of an air ratio smaller than that of said main pre-mixed gas to said auxiliary nozzles (15).
Claim 5
Dependent Claim
74 words
A gas turbine combustor comprising a plurality of main cylindrical nozzles (14) provided in the end wall on the upstream side of a cylindrical combustion chamber (20), auxiliary nozzles (15) formed around each of said main nozzles (14) in concentric therewith, main pre-mixed gas supply means (17, 18) for supplying a pre-mixed gas to said nozzles (14), and auxiliary pre-mixed gas supply means (31) for supplying a pre-mixed gas to said auxiliary nozzles (15).
Claim 6
Dependent Claim
74 words
A gas turbine combustor comprising a plurality of main cylindrical nozzles (14) provided in the end wall on the upstream side of a cylindrical combustion chamber (20), auxiliary nozzles (15) formed around each of said main nozzles (14) in concentric therewith, main pre-mixed gas supply means (17, 18) for supplying a pre-mixed gas to said nozzles (14), and auxiliary pre-mixed gas supply means (31) for supplying a pre-mixed gas to said auxiliary nozzles (15).
Claim 7
Dependent Claim
90 words
A gas turbine combustor comprising a plurality of cylindrical main nozzles (14) provided in the end wall on the upstream side of a cylindrical combustion chamber (20), auxiliary nozzles (15) provided around each of said main nozzles (14) in concentric therewith, main pre-mixed gas supply means (17, 18) for supplying a pre-mixed gas having an air ratio greater than 1 to said main nozzles (14), and auxiliary pre-mixed gas supply means (31) for supplying a pre-mixed gas having an air ratio of 0.8 to 1.2 to said auxiliary nozzles (15).
Claim 8
Dependent Claim
90 words
A gas turbine combustor comprising a plurality of cylindrical main nozzles (14) provided in the end wall on the upstream side of a cylindrical combustion chamber (20), auxiliary nozzles (15) provided around each of said main nozzles (14) in concentric therewith, main pre-mixed gas supply means (17, 18) for supplying a pre-mixed gas having an air ratio greater than 1 to said main nozzles (14), and auxiliary pre-mixed gas supply means (31) for supplying a pre-mixed gas having an air ratio of 0.8 to 1.2 to said auxiliary nozzles (15).
Claim 9
Dependent Claim
103 words
A gas turbine combustor comprising a plurality of cylindrical main nozzles (14) provided in the end wall on the upstream side of a cylindrical combustor (20), auxiliary nozzles (15) formed around each of said main nozzles (14) in concentric therewith, main pre-mixed gas supply means (17, 18) for supplying a pre-mixed gas to said main nozzles (14) at an injection speed greater than the speed of combustion of said pre-mixed gas, and auxiliary pre-mixed gas supply means (31) for supplying a pre-mixed gas to said auxiliary nozzles (15) at an injection speed nearly equal to the speed of combustion of said pre-mixed gas.
Claim 10
Dependent Claim
103 words
A gas turbine combustor comprising a plurality of cylindrical main nozzles (14) provided in the end wall on the upstream side of a cylindrical combustor (20), auxiliary nozzles (15) formed around each of said main nozzles (14) in concentric therewith, main pre-mixed gas supply means (17, 18) for supplying a pre-mixed gas to said main nozzles (14) at an injection speed greater than the speed of combustion of said pre-mixed gas, and auxiliary pre-mixed gas supply means (31) for supplying a pre-mixed gas to said auxiliary nozzles (15) at an injection speed nearly equal to the speed of combustion of said pre-mixed gas.
Claim 11
Dependent Claim
115 words
A gas turbine combustor comprising a plurality of cylindrical main nozzles (14) provided in the end wall on the upstream side of a cylindrical combustion chamber (20), auxiliary nozzles (15) formed annularly to surround the circumference of each of said main nozzles (14), main pre-mixed gas supply means (17, 18) for supplying a pre-mixed gas having an air ratio greater than 1 to said main nozzles (14) at an injection speed greater than 20 m/sec, and auxiliary pre-mixed gas supply means (31) for supplying a pre-mixed gas having an air ratio of 0.8 to 1.2 to said auxiliary nozzles (15) at an injection speed nearly equal to the speed of combustion of said pre-mixed gas.
Claim 12
Dependent Claim
115 words
A gas turbine combustor comprising a plurality of cylindrical main nozzles (14) provided in the end wall on the upstream side of a cylindrical combustion chamber (20), auxiliary nozzles (15) formed annularly to surround the circumference of each of said main nozzles (14), main pre-mixed gas supply means (17, 18) for supplying a pre-mixed gas having an air ratio greater than 1 to said main nozzles (14) at an injection speed greater than 20 m/sec, and auxiliary pre-mixed gas supply means (31) for supplying a pre-mixed gas having an air ratio of 0.8 to 1.2 to said auxiliary nozzles (15) at an injection speed nearly equal to the speed of combustion of said pre-mixed gas.
Claim 13
Dependent Claim
38 words
A pre-mixed combustion method for a gas turbine combustor wherein a pre-mixed gas injected from the openings of main cylindrical nozzles (14) is burned with a pre-mix flame (80) formed around the openings of said main nozzles (14)
Claim 14
Dependent Claim
38 words
A pre-mixed combustion method for a gas turbine combustor wherein a pre-mixed gas injected from the openings of main cylindrical nozzles (14) is burned with a pre-mix flame (80) formed around the openings of said main nozzles (14)
Claim 15
Dependent Claim
56 words
A pre-mixed combustion method for a gas turbine combustor wherein a pre-mixed gas having an air ratio of greater than 1 is injected from the openings of main cylindrical nozzles (14) at a speed of greater than 20 m/sec., and is burned with a pre-mix flame (80) formed around the openings of said main nozzles (14).
Claim 16
Dependent Claim
56 words
A pre-mixed combustion method for a gas turbine combustor wherein a pre-mixed gas having an air ratio of greater than 1 is injected from the openings of main cylindrical nozzles (14) at a speed of greater than 20 m/sec., and is burned with a pre-mix flame (80) formed around the openings of said main nozzles (14).
Claim 17
Dependent Claim
56 words
A pre-mixed combustion method for a gas turbine combustor wherein a pre-mixed gas having an air ratio of greater than 1 is injected from the openings of main cylindrical nozzles (14), and is burned with a pre-mix flame (80) having an air ratio of 0.8 to 1.2 formed around the openings of said main nozzles (14).
Claim 18
Dependent Claim
56 words
A pre-mixed combustion method for a gas turbine combustor wherein a pre-mixed gas having an air ratio of greater than 1 is injected from the openings of main cylindrical nozzles (14), and is burned with a pre-mix flame (80) having an air ratio of 0.8 to 1.2 formed around the openings of said main nozzles (14).
Claim 19
Dependent Claim
61 words
A pre-mixed combustion method for a gas turbine combustor wherein a pre-mixed gas having an air ratio of greater than 1 is injected from the openings of main cylindrical nozzles (14) at a speed greater than the speed of combustion of said pre-mixed gas, and is burned with a pre-mix flame (80) fomred around the openings of said main nozzles (14).
Claim 20
Dependent Claim
61 words
A pre-mixed combustion method for a gas turbine combustor wherein a pre-mixed gas having an air ratio of greater than 1 is injected from the openings of main cylindrical nozzles (14) at a speed greater than the speed of combustion of said pre-mixed gas, and is burned with a pre-mix flame (80) fomred around the openings of said main nozzles (14).
References Cited (Backward Citations)
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