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A fuel selected from powder fuels and liquid fuel is ejected through a fuel ejection pipe having an annular ejection opening; primary air is ejected through primary air-ejecting openings arranged on outer and inner sides of the fuel ejection, to form outer and inner primary air-ejection straight str

A fuel selected from powder fuels and liquid fuel is ejected through a fuel ejection pipe having an annular ejection opening; primary air is ejected through primary air-ejecting openings arranged on outer and inner sides of the fuel ejection, to form outer and inner primary air-ejection straight streams between which the fuel ejection stream is interposed, and to burn the fuel ejection stream. When a powder fuel is used, optionally, a liquid fuel is further ejected and mixed with the above-mentioned primary air streams, and the liquid and powder fuels are burnt together.

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1. An apparatus for burning a liquid fuel, comprising: a powder fuel-ejection means comprising a powder fuel-ejection pipe (25) having an annular ejection opening (26) for ejecting a powder fuel together with air for conveying the powder fuel;an outer primary air-ejection pipe (23) arranged on an ou

1. An apparatus for burning a liquid fuel, comprising: a powder fuel-ejection means comprising a powder fuel-ejection pipe (25) having an annular ejection opening (26) for ejecting a powder fuel together with air for conveying the powder fuel;an outer primary air-ejection pipe (23) arranged on an outer side of the fuel-ejection means and having a plurality of outer primary air-ejection openings (24) through which primary air is ejected in parallel to a fuel-ejection direction of the fuel-ejection means; an inner primary air-ejection pipe (27) arranged on an inner side of the fuel-ejection means and having a plurality of inner primary air-ejection openings (28) through which primary air is ejected in parallel to the powder fuel-ejection direction of the fuel-ejection means; and a liquid fuel-ejecting means arranged on the inner side of the inner primary air ejection pipes (27) and comprising at least one liquid fuel-spraying pipe (39) having a liquid fuel-spraying opening (38) through which a liquid fuel is radially sprayed, wherein the plurality of outer primary air ejection openings (24) of the outer primary air-ejection pipe (23) and the plurality of inner primary air-ejection openings (28) of the inner primary air-ejection pipe (27) are respectively arranged on outer and inner concentric circumferences between which the annular ejection opening (26) of the powder fuel-ejection pipe (25) is located, and the inner primary air-ejection openings (28) are positioned apart from straight lines extending through center points of the outer primary air-ejection openings (24) and the center point of the concentric circumferences.