Combustion method and apparatus for reducing emission concentrations of NO.sub.x and CO
AssigneeMiura Co., Ltd.
InventorsToshihiro Kayahara, Osamu Tanaka, Akinori Kawakami, Tetsushi Nakai, Kazuhiro Ikeda
Life of this patent
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Abstract
A combustion flame is distributed so as to cross a group of heat absorbing tubes arranged parallel to and spaced from one another, thereby cooling the combustion flame. A specific temperature zone of approximately 1000.degree. C.-1300.degree. C. for suppressing generation of NO.sub.x and accelerating oxidation of CO is locally formed within the heat absorbing tubes by decimating at least one tube. In the zone, CO generated upstream of the zone is oxidized by reacting with reaction radicals generated by combustion and/or oxygen.
Claims17
A combustion apparatus comprising:
- a pair of substantially parallel heat absorbing tube walls defining a section;
- a burner disposed on a first side of said section;
- a combustion exhaust gas outlet disposed on a second side of said section;
- a plurality of heat absorbing tubes disposed in said section so that said heat absorbing tubes cross a combustion flame produced by said burner, said heat absorbing tubes being substantially parallel with one another and arranged at specific intervals, at least one heat absorbing tube at a predetermined one of said specific intervals being decimated to locally form a specific temperature zone in said section for suppressing generation of NO.sub.x and accelerating oxidation of CO.
A method of combustion comprising the steps of:
- (a) providing a pair of substantially parallel heat absorbing tube walls defining a section;
- (b) producing a combustion flame using a burner disposed on a first side of said section;
- (c) providing a plurality of heat absorbing tubes disposed in said section so that said heat absorbing tubes cross said combustion flame produced by said burner, said heat absorbing tubes being substantially parallel with one another and arranged at specific intervals, at least one heat absorbing tube at a predetermined one of said specific intervals being decimated to locally form a specific temperature zone in said section for suppressing generation of NO.sub.x and accelerating oxidation of CO;
- and
- (d) exhausting combustion gas using a combustion exhaust gas outlet disposed on a second side of said section.
Dependencies are inferred from the claim text.