Solid fuel burner, boiler equipment, nozzle unit for solid fuel burner, and guide vane unit

A nozzle unit inserted into a burner throat bored in a wall portion of a furnace and being applied to a solid fuel burner, the solid fuel burner including:

• a solid fuel nozzle for ejecting mixed fluid of solid fuel and primary air,
• a secondary air nozzle for ejecting secondary air, which is provided concentrically with the solid fuel nozzle on an outer periphery side of the solid fuel nozzle;
• a tertiary air nozzle for ejecting tertiary air, which is provided concentrically with the secondary air nozzle on an outer periphery side of the secondary air nozzle;
• and
• a secondary air guide member for guiding a flow of the secondary air outwardly in a radial direction, which is positioned on an outer peripheral portion at a distal end of the solid fuel nozzle,
• the nozzle unit being disposed on an outer peripheral portion at a distal end of the secondary air nozzle, and
• the nozzle unit comprising:
• a plurality of tertiary air guide members for guiding a flow of the tertiary air outwardly in the radial direction at a first angle with respect to a central axis of the solid fuel burner;
• a seal air introduction member for introducing a part of the tertiary air as seal air to guide the seal air outwardly in the radial direction at the first angle, which is provided on an outside of the plurality of tertiary air guide members in the radial direction;
• a seal air leading member for leading the seal air to the seal air introduction member, which is provided on an end portion of the seal air introduction member at an upstream side of the flow of the tertiary air;
• a seal air deflection member for deflecting the seal air outwardly in the radial direction, which is provided on a distal end portion of the seal air introduction member, and
• the seal air deflection member and a distal end position of the seal air introduction member are housed within the burner throat so as to be closer to the burner than an open surface in the axial direction, the open surface being defined by a furnace-side axial edge of the inner peripheral surface of the burner throat.

A guide vane unit detachably disposed on an outer peripheral portion at a distal end of a solid fuel nozzle provided in a solid fuel burner to be inserted into a burner throat bored in a wall portion of a furnace ejecting mixed fluid of solid fuel and carrier gas so as to guide combustion gas flowing on an outer peripheral side of the solid fuel nozzle,

• the guide vane unit comprising:
• a plurality of combustion gas guide members for guiding a flow of the combustion gas outwardly in a radial direction at a first angle with respect to a central axis of the solid fuel burner, which is disposed having intervals therebetween in the radial direction;
• a seal gas introduction member for introducing a part of the combustion gas as seal gas to guide the seal gas outwardly in the radial direction at the first angle, which is provided on an outside of the plurality of combustion gas guide members in the radial direction;
• a seal gas leading member for leading the seal gas to the seal gas introduction member, which is provided on an end portion of the seal gas introduction member at an upstream side of the flow of the combustion gas;
• a seal gas deflection member for deflecting the seal gas outwardly in the radial direction, which is provided on a distal end portion of the seal gas introduction member, and
• the seal air deflection member and a distal end position of the seal air introduction member are housed within the burner throat so as to be closer to the burner than an open surface in the axial direction, the open surface being defined by a furnace-side axial edge of the inner peripheral surface of the burner throat.