# US 12,222,105 B2 · Combustor 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 12,222,105 B2 - Document ID: US12222105B2 - Status: Granted - Kind: B2 - Application number: 17/434,879 - Filed: 2020-01-24 - Published: 2022-05-26 - Granted: 2025-02-11 - Earliest claimed: 2019-03-25 - Assignees: Mitsubishi Heavy Industries, Ltd. - Applicants: Mitsubishi Power, Ltd. - Inventors: Keisuke Miura; Katsuyoshi Tada; Keijiro Saito; Tomomi Koganezawa; Mitsuhiro Karishuku - Web page: https://patentgrep.com/patent/US12222105B2 ## CPC - F23R 3/286: {having fuel-air premixing devices (F23R3/30 takes precedence)} - F02C 7/22: Fuel supply systems - F23D 14/70: Baffles or like flow-disturbing devices - F23R 3/12: inducing a vortex - F23R 3/18: Flame stabilising means, e.g. flame holders for after-burners of jet-propulsion plants - 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) - F23D: BURNERS ## Abstract A combustor includes a plurality of fuel nozzles installed so as to be extended in a direction of a nozzle axis and configured to inject fuel toward one side in the direction of the nozzle axis, a pipe plate having a plurality of air holes formed therein so as to be extended in the direction of the nozzle axis, in which the air hole has an inner diameter larger than a tip end portion of the fuel nozzle and the tip end portions are respectively inserted into the air holes, and a step surface formed at a position of the tip end portion closer to the other side in the direction of the nozzle axis than a tip end surface of the tip end portion so as to be expanded in a radial direction with respect to the nozzle axis from a tip end outer peripheral surface. ## Claims ### Claim 1 A combustor comprising: a plurality of fuel nozzles which are parallel to each other, wherein each of the plurality of fuel nozzles has a respective center nozzle axis, and each of the plurality of fuel nozzles is configured to inject fuel in a direction of the respective center nozzle axis; and a pipe plate having a plurality of air holes that are formed in the pipe plate, wherein a respective tip end portion of each of the plurality of fuel nozzles is inserted into a respective air hole of the plurality of air holes, and the respective air hole of the plurality of air holes has an inner diameter, and the respective tip end portion of each of the plurality of fuel nozzles is extended in the direction of the respective center nozzle axis, wherein the respective tip end portion of each of the plurality of fuel nozzles has a tip end surface formed at a first side and the fuel is injected from an opening at the tip end surface, a single step surface formed at a second side that is opposite to the first side relative to the direction of the respective center nozzle axis, a tapered tip end outer peripheral surface connecting the tip end surface and the single step surface, the single step surface extending outwardly from the tapered tip end outer peripheral surface to a radial outer edge in a radial direction relative to the direction of the respective center nozzle axis, and an upstream side outer peripheral surface connected to the radial outer edge of the single step surface, wherein, for the respective tip end portion of each of the plurality of fuel nozzles, the single step surface is located inside the respective air hole, wherein, for the respective tip end portion of each of the plurality of fuel nozzles, an outer diameter of the tip end surface is smaller than an outer diameter of the single step surface and the inner diameter of the respective air hole of the plurality of air holes, and wherein, around the respective tip end portion of each of the plurality of fuel nozzles, an air flow is introduced into the respective air hole of the plurality of air holes along the upstream side outer peripheral surface of the respective tip end portion of each of the plurality of fuel nozzles. ### Claim 2 (depends on 1) The combustor according to claim 1, wherein, for the respective tip end portion of each of the plurality of fuel nozzles, a region of the tapered tip end outer peripheral surface between the single step surface and the tip end surface is formed so as to be extended radially inward in the radial direction relative to the respective center nozzle axis from the single step surface toward the tip end surface. ### Claim 3 (depends on 1) The combustor according to claim 1, wherein, for the respective tip end portion of each of the plurality of fuel nozzles, when an axial length of a region of the tapered tip end outer peripheral surface, which is an outer peripheral surface between the single step surface and the tip end surface, is x and a radial width between the radial outer edge of the single step surface and an radial outer edge of the tip end surface in the radial direction relative to the respective center nozzle axis is s, a first condition of 5