# US 8,500,440 B2 · Burner block for producing flat flame > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,500,440 B2 - Document ID: US8500440B2 - Status: Granted - Kind: B2 - Application number: 12/401,040 - Filed: 2009-03-10 - Published: 2010-07-01 - Granted: 2013-08-06 - Earliest claimed: 2008-12-31 - Assignees: Linde Aktiengesellschaft - Applicants: Andrew P. Richardson - Inventors: Andrew P. Richardson - Web page: https://patentgrep.com/patent/US8500440B2 ## CPC - F23D 14/58: characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration - F23D 1/00: Burners for combustion of pulverulent fuel - F23D 14/22: with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other - F23L 7/007: {Supplying oxygen or oxygen-enriched air} - F23D 2900/00013: with means for spreading the flame in a fan or fishtail shape over a melting bath - Y02E 20/34: Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery - F23D: BURNERS - F23L: SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ({air-supply arrangements for fluent fuels F23C;} firebridges with means for feeding air or steam F23M3/04; baffles or shields with air supply passages F23M9/04); VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS {(dampers and throat restrictors for open fire-places F24; air inlet valves for open fire fronts F24)}; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A burner for a melter is provided which includes a nozzle, a fuel stream moving through the nozzle, and an oxidant stream including an initial elliptical cross section and being external to the nozzle and surrounding the fuel stream for providing a combustion stream having a cross section transitioning from an elliptical cross section to a circular cross section to provide a flat flame from the circular cross section for combustion in the melter. A method for producing a flat flame is also provided. ## Claims ### Claim 1 A burner for a melter, comprising: a fuel nozzle having a fuel passage therein for a fuel stream and extending to a fuel nozzle tip having an elliptical cross section, the fuel nozzle constructed with the fuel nozzle tip transitioning to a circular cross section at a discharge orifice of said burner; and an oxidant passage surrounding the fuel passage and extending to an oxidant opening at the fuel nozzle tip, the oxidant opening having another elliptical cross section and being external to the fuel nozzle for transitioning from said another elliptical cross section to said circular cross section at said discharge orifice to provide a flat flame from the circular cross section for combustion in the melter. ### Claim 2 (depends on 1) The burner of claim 1, wherein the fuel stream comprises a circular cross section. ### Claim 3 (depends on 1) The burner of claim 1, wherein the fuel stream is displaceable vertically with respect to the oxidant stream for providing at least one of said streams to be fuel-rich and the other of said streams to be fuel-lean. ### Claim 4 (depends on 1) The burner of claim 1, wherein the fuel stream comprises a gaseous fuel selected from at least one of methane, natural gas, liquefied natural gas, propane, liquefied propane gas, butane, low BTU gases, town gas, producer gas and mixtures thereof. ### Claim 5 (depends on 1) The burner of claim 1, wherein the fuel stream comprises a liquid fuel selected from at least one of heavy fuel oil, medium fuel oil, light fuel oil, kerosene, diesel and mixtures thereof. ### Claim 6 (depends on 1) The burner of claim 1, wherein the fuel stream comprises a particulate solid fuel selected from at least one of coal, coke, petroleum coke, rubber, woodchips, sawdust, straw, biomass fuels and mixtures thereof suspended in a carrier gas stream selected from at least one of air, nitrogen, carbon dioxide and a gaseous fuel, the gaseous fuel selected from at least one of methane, natural gas, liquefied natural gas, propane, liquefied propane gas, butane, low BTU gases, town gas, producer gas and mixtures thereof. ### Claim 7 (depends on 1) The burner of claim 1, wherein the oxidant stream comprises an oxidant selected from at least one of oxygen-enriched air, non-pure oxygen and industrially pure oxygen. ### Claim 8 A method of producing a flat flame from a nozzle for combustion in a melter, comprising: moving a fuel stream through the nozzle, moving an oxidant stream surrounding and external to the nozzle and having its major axis perpendicular to the fuel stream for having an elliptical cross section, converging the fuel stream with the oxidant stream for providing a combustion stream emitted from the nozzle having an elliptical cross section, and transitioning said combustion stream from said elliptical cross section to a circular cross section for providing a flame having a substantially flattened cross section for combustion in the melter. ### Claim 9 (depends on 8) The method of claim 8, further comprising displacing the fuel stream vertically with respect to the oxidant stream for providing at least one of said streams to be fuel-rich and the other of said streams to be fuel-lean. ### Claim 10 (depends on 8) The method of claim 8, wherein the fuel stream and the oxidant stream are co-axial. ### Claim 11 (depends on 8) The method of claim 8, wherein the fuel stream comprises a gaseous fuel selected from at least one of methane, natural gas, liquefied natural gas, propane, liquefied propane gas, butane, low BTU gases, town gas, producer gas and mixtures thereof. ### Claim 12 (depends on 8) The method of claim 8, wherein the fuel stream comprises a liquid fuel selected from at least one of heavy fuel oil, medium fuel oil, light fuel oil, kerosene, diesel and mixtures thereof. ### Claim 13 (depends on 8) The method of claim 8, wherein the fuel stream comprises a particulate solid fuel selected from at least one of coal, coke, petroleum coke, rubber, woodchips, sawdust, straw, biomass fuels and mixtures thereof suspended in a carrier gas stream selected from at least one of air, nitrogen, carbon dioxide and a gaseous fuel, the gaseous fuel selected from at least one of methane, natural gas, liquefied natural gas, propane, liquefied propane gas, butane, low BTU gases, town gas, producer gas and mixtures thereof. ### Claim 14 (depends on 8) The method of claim 8, wherein the oxidant stream comprises an oxidant selected from at least one of oxygen-enriched air, non-pure oxygen and industrially pure oxygen.