(19)
(11) EP 1 916 476 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
27.02.2013 Bulletin 2013/09

(43) Date of publication A2:
30.04.2008 Bulletin 2008/18

(21) Application number: 07118299.2

(22) Date of filing: 11.10.2007
(51) International Patent Classification (IPC): 
F23D 1/00(2006.01)
 F23K 3/02(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(30) Priority: 20.10.2006 JP 2006286692

(71) Applicant: Mitsubishi Heavy Industries, Ltd.
Tokyo 108-8215 (JP)

(72) Inventors:
  • Takashima, Ryuhei
    717-1, Fukahori-machi 5-chome Nagasaki Nagasaki-ken 851-0392 (JP)
  • Fujimura, Koutaro
    717-1, Fukahori-machi 5-chome Nagasaki Nagasaki-ken 851-0392 (JP)
  • Okamoto, Akiyasu
    717-1, Fukahori-machi 5-chome Nagasaki Nagasaki-ken 851-0392 (JP)
  • Suto, Takayuki
    1-1, Akunoura-machi Nagasaki Nagasaki-ken 850-8610 (JP)
  • Amano, Iwamaro
    1-1, Akunoura-machi Nagasaki Nagasaki-ken 850-8610 (JP)
  • Hirata, Toshihiro
    1-1, Akunoura-machi Nagasaki Nagasaki-ken 850-8610 (JP)

(74) Representative: Henkel, Breuer & Partner 
Patentanwälte Maximiliansplatz 21
80333 München
80333 München (DE)

   


(54) Burner structure


(57) To provide a low combustibility fuel firing burner that can ensure high ignition performance and combustion stability even if a gas flow rate is changed along with changes in boiler load or the like. A low combustibility fuel firing burner separates a pulverized low combustibility fuel supplied together with an air with a separator, distributing the separated fuel to a rich portion nozzle and a lean portion nozzle provided in a furnace, and burning the fuel, in which a variable control part such as a core or a flow adjusting/blocking valve is provided in at least one of a high-particle-concentration gas pipe extending from a downstream side of the separator and communicating with the rich portion nozzle and a low-particle-concentration gas pipe extending from the downstream side of the separator and communicating with the lean portion nozzle.







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