초록 ▼

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.

대표청구항 ▼

[ What is claimed is:] [1.]1. An apparatus for burning a fuel comprising a means for ejecting at least one fuel selected from powder fuels and liquid fuels; an outer primary air ejection pipe (23) arranged on the outer side of the fuel-ejection means and having a plurality of outer primary air-eject

[ What is claimed is:] [1.]1. An apparatus for burning a fuel comprising a means for ejecting at least one fuel selected from powder fuels and liquid fuels; an outer primary air ejection pipe (23) arranged on the 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 the fuel-ejection direction of the fuel-ejection means; and an inner primary air-ejection pipe (27) arranged on the 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 fuel-ejection direction of the fuel-ejection means,wherein, the fuel-ejection means comprises a powder fuel-ejection pipe (25) having an annular ejection opening (26) through which a powder fuel is ejected together with air for conveying the powder fuel, andthe plurality of air-ejection openings (24) of the outer primary air-ejection pipe (23) and the plurality of ejection openings (28) of the inner primary air-ejection pipe (27) are arranged on concentric circumferences in such a manner that the annular ejection opening of the powder fuel-ejection pipe is located between the outer air-ejection openings and the inner air-ejection openings, and the inner primary air-ejection openings are located apart from any straight lines extending through both the center points of the outer primary air-ejection openings and the center point of the concentric circumferences. [2.]2. A method of burning a powder fuel in a fuel burning apparatus comprising a means for ejecting a powder fuel, an outer primary air-ejection pipe (23) arranged on the outer side of the fuel-ejection means and having a plurality of outer primary air-ejection openings (24) and an inner primary air-ejection pipe (27) arranged on the inner side of the fuel-ejection means and having plurality of inner primary air-ejection openings (28), the fuel-ejection means comprising a powder fuel-ejection pipe (25) having an annular ejection opening (26), the plurality of air-ejection openings (24) of the outer primary air-ejection pipe (23) and the plurality of ejection openings (28) of the inner primary air-ejection pipe (27) being arranged on concentric circumferences in such a manner that the annular ejection opening of the powder fuel-ejection pipe is located between the outer air-ejection openings and the inner air-ejection openings, and the inner primary air-ejection openings being located apart from any straight lines extending through both the center points of the outer primary air-ejection openings and the center point of the concentric circumferences, which method comprises:ejecting a powder fuel together with the powder fuel-conveying air through the annular fuel ejection opening; and ejecting primary air through the outer and inner primary air-ejection openings in the same direction as that of the powder fuel-ejection stream, to form outer and inner primary air-ejection straight streams between which the powder fuel-ejection stream is interposed.