A combustion burner 1 includes a fuel nozzle 2 that injects fuel gas prepared by mixing solid fuel and primary air, secondary air nozzles 3, 4 that inject secondary air from the outer periphery of the fuel nozzle 2, and a flame holder 5 that is arranged in an opening of the fuel nozzle 2. In the com
A combustion burner 1 includes a fuel nozzle 2 that injects fuel gas prepared by mixing solid fuel and primary air, secondary air nozzles 3, 4 that inject secondary air from the outer periphery of the fuel nozzle 2, and a flame holder 5 that is arranged in an opening of the fuel nozzle 2. In the combustion burner 1, the flame holder 5 has a splitting shape that widens in the flow direction of the fuel gas. When seen in cross section along a direction in which the flame holder 5 widens, the cross section passing through the central axis of the fuel nozzle 2, a maximum distance h from the central axis of the fuel nozzle 2 to the widened end of the flame holder 5 and an inside diameter r of the opening 21 of the fuel nozzle 2 satisfy h/(r/2)0.6.
대표청구항▼
1. A combustion burner comprising: a fuel nozzle that injects fuel gas prepared by mixing solid fuel and primary air;a coal secondary air nozzle arranged on an outer side of the fuel nozzle that injects coal secondary air from an outer periphery of the fuel nozzle;a secondary (tertiary) air nozzle a
1. A combustion burner comprising: a fuel nozzle that injects fuel gas prepared by mixing solid fuel and primary air;a coal secondary air nozzle arranged on an outer side of the fuel nozzle that injects coal secondary air from an outer periphery of the fuel nozzle;a secondary (tertiary) air nozzle arranged on an outer side of the fuel nozzle and the coal secondary air nozzle that injects secondary (tertiary) air to the outer periphery of the combustion flame; anda plurality of flame holders that are arranged in an opening of the fuel nozzle,wherein each flame holder has a structure to cross the opening of the fuel nozzle and a splitting shape that divides the fuel gas in a flow direction of the fuel gas when seen in a cross section along a direction in which the flame holder widens, such that a normal line passing through an apex located upstream of the fuel gas is in parallel to an axial direction of the fuel nozzle,wherein the fuel nozzle, the coal secondary air nozzle and the secondary (tertiary) air nozzle are respectively configured to inject the fuel gas, the coal secondary air and the secondary (tertiary) air in a straight flow which flows in parallel to the axial direction of the fuel nozzle,wherein a plurality of flame holders are arranged to extend through each other at one or more intersections, and wherein at least one intersection is placed in a central area of the opening of the fuel nozzle. 2. The combustion burner according to claim 1, wherein a splitting width L of the splitting shape of the flame holder and an inside diameter r of the opening of the fuel nozzle satisfy 0.06≦L/r. 3. The combustion burner according to claim 1, wherein the fuel nozzle has a rectangular or elliptical opening, and the flame holder substantially transects a central area of the opening of the fuel nozzle. 4. The combustion burner according to claim 1, wherein the fuel nozzle has a circular opening, and the flame holder substantially transects a central area of the opening of the fuel nozzle. 5. The combustion burner according to claim 1, wherein a plurality of such secondary (tertiary) air nozzles is arranged, and the secondary (tertiary) air nozzles are capable of adjusting a supply amount of secondary air in a manner relative to each other. 6. The combustion burner according to claim 5, wherein all the secondary (tertiary) air nozzles are constantly operated. 7. The combustion burner according to claim 5, wherein a part of the secondary (tertiary) air nozzles also serves as an oil port or a gas port. 8. The combustion burner according to claim 1, wherein the plurality of the flame holders is arranged in a number sign pattern, and an area surrounded by the flame holders is placed in the central area of the opening of the fuel nozzle. 9. The combustion burner according to claim 1, wherein three of the flame holders is arranged in a crossing manner, and an area surrounded by the flame holders is placed in the central area of the opening of the fuel nozzle. 10. A boiler, comprising; a combustion burner, the combustion burner comprising: a fuel nozzle that injects fuel gas prepared by mixing solid fuel and primary air;a coal secondary air nozzle arranged on an outer side of the fuel nozzle that injects coal secondary air from an outer periphery of the fuel nozzle;a secondary (tertiary) air nozzle arranged on an outer side of the fuel nozzle and the coal secondary air nozzle that injects secondary (tertiary) air to the outer periphery of the combustion flame; anda plurality of flame holders that are arranged in an opening of the fuel nozzle,wherein each flame holder has a structure to cross the opening of the fuel nozzle and a splitting shape that divides the fuel gas in a flow direction of the fuel gas when seen in a cross section along a direction in which the flame holder widens, such that a normal line passing through an apex located upstream of the fuel gas is in parallel to an axial direction of the fuel nozzle,wherein the fuel nozzle, the coal secondary air nozzle and the secondary (tertiary) air nozzle are respectively configured to inject the fuel gas, the coal secondary air and the secondary (tertiary) air in a straight flow which flows in parallel to the axial direction of the fuel nozzle,wherein a plurality of flame holders are arranged to extend through each other at one or more intersections, and wherein at least one intersection is placed in a central area of the opening of the fuel nozzle. 11. The combustion burner according to claim 8, wherein a splitting width L of the splitting shape of the flame holder and the inside diameter r of the opening of the fuel nozzle satisfy 0.06≦L/r. 12. The combustion burner according to claim 8, wherein the fuel nozzle has a rectangular or elliptical opening, and the flame holder substantially transects a central area of the opening of the fuel nozzle. 13. The combustion burner according to claim 8, wherein the fuel nozzle has a circular opening, and the flame holder substantially transects a central area of the opening of the fuel nozzle. 14. The combustion burner according to claim 8, wherein a plurality of such secondary (tertiary) air nozzles is arranged, and the secondary (tertiary) air nozzles are capable of adjusting a supply amount of secondary air in a manner relative to each other. 15. The combustion burner according to claim 9, wherein a splitting width L of the splitting shape of the flame holder and the inside diameter r of the opening of the fuel nozzle satisfy 0.06≦L/r. 16. The combustion burner according to claim 9, wherein the fuel nozzle has a rectangular or elliptical opening, and the flame holder substantially transects a central area of the opening of the fuel nozzle. 17. The combustion burner according to claim 9, wherein the fuel nozzle has a circular opening, and the flame holder substantially transects a central area of the opening of the fuel nozzle. 18. The combustion burner according to claim 9, wherein a plurality of such secondary (tertiary) air nozzles is arranged, and the secondary (tertiary) air nozzles are capable of adjusting a supply amount of secondary air in a manner relative to each other.
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이 특허에 인용된 특허 (7)
Deussner Herbert (Bergisch Gladbach DEX) Herchenbach Horst (Hennef/Sieg Heisterschoss DEX) Ramesohl Hubert (Bergisch Gladbach DEX) Breidenstein Wolfgang (Bergisch Gladbach DEX), Burner for solid fuels.
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