# US 11,079,113 B2 · Fuel injector and gas turbine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,079,113 B2 - Document ID: US11079113B2 - Status: Granted - Kind: B2 - Application number: 16/607,968 - Filed: 2018-04-27 - Published: 2021-04-08 - Granted: 2021-08-03 - Earliest claimed: 2017-04-28 - Assignees: Mitsubishi Power, Ltd. - Applicants: Mitsubishi Hitachi Power Systems, Ltd. - Inventors: Katsuyoshi Tada; Kei Inoue; Satoshi Tanimura; Keijiro Saito - Web page: https://patentgrep.com/patent/US11079113B2 ## CPC - F23R 3/286: {having fuel-air premixing devices (F23R3/30 takes precedence)} - F02C 7/18: the medium being gaseous, e.g. air {(F02C7/125 takes precedence)} - F02C 7/22: Fuel supply systems - F02C 7/222: {Fuel flow conduits, e.g. manifolds} - F23R 3/283: {Attaching or cooling of fuel injecting means including supports for fuel injectors, stems, or lances} - F23R 3/346: {for staged combustion} - F05D 2240/35: Combustors or associated equipment - F05D 2260/201: by impingement of a fluid - F05D 2260/213: by the provision of a heat exchanger within the cooling circuit - F05D 2260/2212: by creating turbulence - F05D 2260/232: characterized by the cooling medium - F23R: GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS (fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures F23C10/16) - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS ## Abstract A fuel injector including a fuel supply tube (8), a plurality of premix tubes (2), a support plate (3) which supports the fuel supply tube and the plurality of premix tubes, a substrate which supports downstream end portions of the plurality of premix tubes, an outer wall which is cylindrical, which forms a plenum (P) inside, a partition plate which partitions the plenum (P) into a fuel plenum (PF) and a cooling air plenum (PA), a baffle which partitions the cooling air plenum (PA) into an upstream cooling air plenum (PA1) and a downstream cooling air plenum (PA2) and has a plurality of cooling holes formed therein, and a cooling air supply tube configured to supply cooling air to the upstream cooling air plenum (PA1), in which the end portion on the downstream side of the fuel supply tube opens in the fuel plenum (PF), and a fuel introduction hole. ## Claims ### Claim 1 A fuel injector comprising: a fuel supply tube which has a tubular shape centered on an axis and into which a fuel gas is introduced from an upstream side in an axial direction in which the axis extends, a plurality of premix tubes which have a tubular shape extending in the axial direction and into which air is introduced from the upstream side; a support plate which supports a downstream side in the axial direction of the fuel supply tube and upstream end portions of the plurality of premix tubes, and oriented perpendicularly to said axis; a substrate which supports downstream end portions of the plurality of premix tubes, and oriented perpendicularly to said axis; an outer wall which is cylindrical, which connects the support plate to the substrate and forms a plenum inside together with the support plate and the substrate, a partition plate which partitions the plenum into a fuel plenum and a cooling air plenum disposed downstream of the fuel plenum, and oriented perpendicularly to said axis; a baffle, disposed downstream of the partition plate and upstream of the substrate, with at least a partially inclined portion radially outward on the downstream side with respect to said axis, and having holes through which premix tubes pass therein, and cooling holes are not formed in the al least partially inclined therein, and cooling holes are not formed in the at least partially inclined portion and a cooling air supply tube which is configured to supply cooling aft to the upstream cooling air plenum, wherein an end portion on the downstream side of the fuel supply tube opens in the fuel plenum; and at least one fuel introduction hole which penetrates each of the premix tubes inward and outward is formed at a portion positioned in the fuel plenum of the premix tube, wherein the baffle includes: a baffle body in which the cooling holes are formed and which is provided radially inside and attached to said outer wall with the axis as a center. ### Claim 2 (depends on 1) The fuel injector according to claim 1, wherein at least some of the plurality of cooling holes are impingement holes. ### Claim 3 (depends on 1) The fuel injector according to claim 1, further comprising a plurality of cooling air discharge holes which is formed in the substrate and configured to discharge the cooling air from the downstream cooling air plenum to the downstream side of the substrate. ### Claim 4 (depends on 1) The fuel injector according to claim 1, wherein a cooling air introduction hole penetrating the premix tube inward and outward is formed at a portion positioned in the downstream cooling air plenum of the premix tube. ### Claim 5 (depends on 1) The fuel injector according to claim 1, wherein the cooling air supply tube is disposed coaxially with the fuel supply tube on a radial inner side of the fuel supply tube. ### Claim 6 (depends on 1) A gas turbine comprising: a compressor which is configured to generate compressed air in which air is compressed; a combustor which includes the fuel injector according to claim 1 and mixes fuel with the compressed air to generate a combustion gas; an air extraction part which is configured to extract the compressed air generated by the compressor; a forced air-cooling compressor which is configured to further compress the extracted compressed air; and a cooling air introduction part which introduces the cooling air generated by the forced air-cooling compressor into the fuel injector. ### Claim 7 (depends on 6) The gas turbine according to claim 6, further comprising a cooler which is configured to cool the compressed air extracted by the air extraction part. ### Claim 8 (depends on 2) A gas turbine comprising: a compressor which is configured to generate compressed air in which air is compressed; a combustor which includes the fuel injector according to claim 2 and mixes fuel with the compressed air to generate a combustion gas; an air extraction part which is configured to extract the compressed air generated by the compressor; a forced air-cooling compressor which is configured to further compress the extracted compressed air; and a cooling air introduction part which introduces the cooling air generated by the forced air-cooling compressor into the fuel injector. ### Claim 9 (depends on 3) A gas turbine comprising: a compressor which is configured to generate compressed air in which air is compressed; a combustor which includes the fuel injector according to claim 3 and mixes fuel with the compressed air to generate a combustion gas; an air extraction part which is configured to extract the compressed air generated by the compressor; a forced air-cooling compressor which is configured to further compress the extracted compressed air; and a cooling air introduction part which introduces the cooling air generated by the forced air-cooling compressor into the fuel injector. ### Claim 10 (depends on 4) A gas turbine comprising: a compressor which is configured to generate compressed air in which air is compressed; a combustor which includes the fuel injector according to claim 4 and mixes fuel with the compressed air to generate a combustion gas; an air extraction part which is configured to extract the compressed air generated by the compressor; a forced air-cooling compressor which is configured to further compress the extracted compressed air; and a cooling air introduction part which introduces the cooling air generated by the forced air-cooling compressor into the fuel injector. ### Claim 11 (depends on 5) A gas turbine comprising: a compressor which is configured to generate compressed air in which air is compressed; a combustor which includes the fuel injector according to claim 5 and mixes fuel with the compressed air to generate a combustion gas; an air extraction part which is configured to extract the compressed air generated by the compressor; a forced air-cooling compressor which is configured to further compress the extracted compressed air; and a cooling air introduction part which introduces the cooling air generated by the forced air-cooling compressor into the fuel injector.