Patent ID: 6230635
Filing Date: 2001-05-15
Classification: F23C,F23D,F23G

Abstract:
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.