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(11) | EP 2 677 238 A1 |
(12) | EUROPEAN PATENT APPLICATION |
published in accordance with Art. 153(4) EPC |
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(54) | SOLID FUEL BURNER |
(57) The present invention is to provide a solid fuel burner for suppressing collision
of fuel particles to an inner wall of a fuel nozzle, increasing fuel concentration
and oxygen concentration in an outer circumferential portion in the fuel nozzle while
reducing abrasion of the fuel nozzle, thereby enabling stable combustion. A solid fuel burner 42 of the present invention comprising a fuel nozzle 11 for ejecting a mixed fluid of solid fuel and carrier gas therefor, an oxygen-containing gas nozzle 13, 14 arranged outside the fuel nozzle for ejecting oxygen-containing gas, and at least one oxygen-containing gas addition nozzle 12 projected and installed in the fuel nozzle for ejecting oxygen-containing gas having a velocity component in a circumferential direction of the fuel nozzle, wherein the oxygen-containing gas addition nozzle 12 has a nozzle outlet 12A, 12B, 12C in the circumferential direction of the fuel nozzle, characterized in that: the oxygen-containing gas addition nozzle 12 is shaped so as to contract a projected section thereof in an axial direction of the burner toward a central axis of the burner. |
{Technical Field}
{Background Art}
{Citation List}
{Patent Literature}
{Summary of Invention}
{Problems to be solved by the Invention}
{Means for Solving the Problems}
{Advantageous Effects of Invention}
{Brief Description of Drawings}
{Fig. 1} Fig. 1 is a cross-sectional view showing the structure of embodiment 1 of the solid fuel burner according to the present invention and the state in which the flame of the solid fuel burner is formed from the neighborhood of the circulation flow on the downstream side of a flame stabilizer.
{Fig. 2} Fig. 2 is a drawing showing the schematic structure of the solid fuel burner of the embodiment 1 viewed from the furnace side.
{Fig. 3} Fig. 3 is a perspective view for explaining the structure of the oxygen-containing gas nozzle of the solid fuel burner of the embodiment 1 and the fuel ejection flow inside the fuel nozzle, that is, the flow of fuel and carrier gas therefor.
{Fig. 4} Fig. 4 is a drawing showing the schematic structure of the solid fuel burner of the embodiment 1 viewed from the upstream side of the burner.
{Fig. 5} Fig. 5 is a drawing showing the schematic structure of the embodiment 2 of the solid fuel burner according to the present invention viewed from the furnace side.
{Fig. 6} Fig. 6 is a cross-sectional view showing the structure of the embodiment 3 of the solid fuel burner according to the present invention and the state in which the flame of the solid fuel burner is formed from a near place to the circulation flow on the downstream side of the flame stabilizer.
{Fig. 7} Fig. 7 is a drawing showing the schematic structure of the embodiment 4 of the solid fuel burner according to the present invention viewed from the furnace side.
{Fig. 8} Fig. 8 is a perspective view for explaining the structure of the oxygen-containing gas nozzle of the solid fuel burner of the embodiment 5 and the fuel ejection flow inside the fuel nozzle, that is, the flow of fuel and carrier gas therefor.
{Fig. 9} Fig. 9 is a drawing showing the schematic structure of the solid fuel burner of the embodiment 5 viewed from the upstream side of the burner.
{Fig. 10} Fig. 10 is a cross-sectional view showing the structure of the embodiment 5 of the solid fuel burner according to the present invention and the state in which the flame of the solid fuel burner is formed from a near place to the circulation flow on the downstream side of the flame stabilizer.
{Fig. 11} Fig. 11 is a perspective view for explaining the structure of the oxygen-containing gas nozzle of the solid fuel burner of the embodiment 6 and the fuel ejection flow inside the fuel nozzle, that is, the flow of fuel and carrier gas therefor.
{Fig. 12} Fig. 12 is a drawing showing the schematic structure of the solid fuel burner of the embodiment 6 viewed from the upstream side of the burner.
{Fig. 13} Fig. 13 is a modification of the oxygen-containing gas addition nozzle of the solid fuel burner according to the present invention and a drawing showing the schematic structure of the solid fuel burner viewed from the furnace side.
{Fig. 14} Fig. 14 is another modification of the oxygen-containing gas addition nozzle of the solid fuel burner according to the present invention and a drawing showing the schematic structure of the solid fuel burner viewed from the furnace side.
{Description of Embodiments}
{Embodiment 1}
{Embodiment 2}
{Embodiment 3}
{Embodiment 4}
{Embodiment 5}
{Embodiment 6}
{Reference Signs List}
the oxygen-containing gas addition nozzle is shaped so as to contract a projected section thereof in an axial direction of the burner toward a central axis of the burner.
REFERENCES CITED IN THE DESCRIPTION
Patent documents cited in the description