# US 2014/0190169 A1 · Coaxial Fuel Supply for a Micromixer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0190169 A1 - Document ID: US20140190169A1 - Status: Published application - Kind: A1 - Application number: 13/734,194 - Filed: 2013-01-04 - Published: 2014-07-10 - Earliest claimed: 2013-01-04 - Assignees: General Electric Company - Applicants: General Electric Company - Inventors: Patrick Benedict Melton; James Harold Westmoreland - Web page: https://patentgrep.com/patent/US20140190169A1 ## CPC - F23R 3/286: {having fuel-air premixing devices (F23R3/30 takes precedence)} - B01F 25/31: in conduits or tubes through which the main component flows - F23D 14/64: with injectors - F23C 2900/03001: Miniaturized combustion devices using fluid fuels - F23R 3/36: Supply of different fuels - 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) - B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06) - F23D: BURNERS - F23C: METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN {A CARRIER GAS OR} AIR (burners F23D) ## Abstract Embodiments of the present application can provide systems and methods for a coaxial fuel supply for a micromixer. According to one embodiment, the micromixer may include an elongated base nozzle structure, a number of mixing tubes in communication with the elongated base nozzle structure, and an air inlet configured to supply the plurality of mixing tubes with air. The elongated base nozzle structure may be configured to supply a fuel to the mixing tubes. ## Claims ### Claim 1 A micromixer for a combustor, comprising: an elongated base nozzle structure; a plurality of mixing tubes in communication with the elongated base nozzle structure; an air inlet configured to supply the plurality of mixing tubes with air; and the elongated base nozzle structure being configured to supply a fuel to the plurality of mixing tubes. ### Claim 2 (depends on 1) The micromixer of claim 1, wherein the elongated base nozzle structure comprises coaxial inner and outer tubes. ### Claim 3 (depends on 2) The micromixer of claim 2, wherein an annulus formed between the coaxial inner tube and outer tubes is configured to supply the fuel to the plurality of mixing tubes. ### Claim 4 (depends on 3) The micromixer of claim 3, wherein inner tube is configured to supply a second fuel directly to a combustion chamber. ### Claim 5 (depends on 1) The micromixer of claim 1, further comprising a fuel plenum formed about one or more holes in the plurality of mixing tubes, the fuel plenum being in communication with the elongated base nozzle structure such that the fuel supplied by the elongated base nozzle structure enters the fuel plenum before entering the plurality of mixing tubes through the one or more holes in the plurality of mixing tubes. ### Claim 6 (depends on 5) The micromixer of claim 5, wherein the fuel entering the fuel plenum is redirected 180 degrees before entering the plurality of mixing tubes through the one or more holes in the plurality of mixing tubes. ### Claim 7 (depends on 5) The micromixer of claim 5, further comprising a fuel conditioning plate disposed within the fuel plenum. ### Claim 8 (depends on 1) The micromixer of claim 1, further comprising an air conditioner plate disposed upstream of the plurality of mixing tubes. ### Claim 9 (depends on 1) The micromixer of claim 1, further comprising a dampening mechanism disposed about the micromixer. ### Claim 10 (depends on 9) The micromixer of claim 9, wherein the dampening mechanism is a hula spring. ### Claim 11 (depends on 1) The micromixer of claim 1, wherein the elongated base nozzle structure is attached to an end plate of the micromixer. ### Claim 12 A segmented micromixer for a combustor, comprising: an elongated base nozzle structure; a plurality of mixing tubes forming a segmented tube bundle in communication with and at least partially supported by the base nozzle structure; an air inlet configured to supply the plurality of mixing tubes with air; and the elongated base nozzle structure being configured to supply a fuel to the plurality of mixing tubes. ### Claim 13 (depends on 12) The micromixer of claim 12, wherein the elongated base nozzle structure comprises coaxial inner and outer tubes, wherein an annulus formed between the coaxial inner tube and outer tubes is configured to supply the fuel to the plurality of mixing tubes, and wherein the inner tube is configured to supply a second fuel directly to a combustion chamber. ### Claim 14 (depends on 12) The micromixer of claim 12, further comprising a fuel plenum formed about one or more holes in the plurality of mixing tubes, the fuel plenum being in communication with the elongated base nozzle structure such that the fuel supplied by the elongated base nozzle structure enters the fuel plenum before entering the plurality of mixing tubes through the one or more holes in the plurality of mixing tubes. ### Claim 15 (depends on 14) The micromixer of claim 14, wherein the fuel entering the fuel plenum is redirected 180 degrees before entering the plurality of mixing tubes through the one or more holes in the plurality of mixing tubes. ### Claim 16 (depends on 14) The micromixer of claim 14, further comprising a fuel conditioning plate disposed within the fuel plenum. ### Claim 17 (depends on 12) The micromixer of claim 12, further comprising an air conditioner plate disposed upstream of the plurality of mixing tubes. ### Claim 18 (depends on 12) The micromixer of claim 12, further comprising a dampening mechanism disposed about the micromixer. ### Claim 19 (depends on 12) The micromixer of claim 12, wherein the elongated base nozzle structure is attached to an end plate of the micromixer. ### Claim 20 A segmented micromixer for a combustor, comprising: one or more elongated base nozzle structure; one or more bundles of mixing tubes each in communication with and at least partially supported by a respective base nozzle structure; one or more air inlets configured to supply the one or more bundles of mixing tubes with air; and the one or more elongated base nozzle structures being configured to supply a fuel to the respective one or more bundles of mixing tubes.