PULVERIZED COAL-FIRED BOILER AND PULVERIZED COAL COMBUSTION METHOD

Title:

PULVERIZED COAL-FIRED BOILER AND PULVERIZED COAL COMBUSTION METHOD

Document Type and Number:

WIPO Patent Application WO/2007/080873

Kind Code:

A1

Abstract:

A pulverized coal-fired boiler which can reduce both NOx and CO by supplying air efficiently to the central portion of a furnace and to the vicinity of the furnace wall thereby accelerating mixing with combustion gas. A main after air port is arranged to jet air with a momentum large enough for the air to reach the central portion of a furnace whereas a sub-after-air-port is arranged to jet air with a small momentum to the vicinity of the furnace wall, characterized in that the center of cross-section of the sub-after-air-port falls within a range of 1-5 times the diameter of the main after-air-port from the center of cross-section thereof. A pulverized coal-fired boiler which can reduce both NOx and CO by supplying air efficiently to the central portion of the furnace and to the vicinity of the furnace wall thereby accelerating mixing with combustion gas can thereby be provided.

Inventors:

KAMIKAWA YUKI (JP)
TANIGUCHI MASAYUKI (JP)
ORITA HISAYUKI (JP)
KOBAYASHI HIRONOBU (JP)
BABA AKIRA (JP)
MINE TOSHIHIKO (JP)
NOMURA SHINICHIROU (JP)
OOYATSU NORIYUKI (JP)
TADAKUMA SATOSHI (JP)
YOSHIZAKO HIDEHISA (JP)
KANEMOTO HIROAKI (JP)
KURAMASHI KOUJI (JP)
ORII AKIHITO (JP)
TSUDA SHINJI (JP)
OKAZAKI HIROFUMI (JP)
YANO TAKANORI (JP)
SHIMOHIRA KATSUMI (JP)

Application Number:

PCT/JP2007/050132

Publication Date:

July 19, 2007

Filing Date:

January 10, 2007

Export Citation:

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Assignee:

BABCOCK HITACHI KK (JP)
KAMIKAWA YUKI (JP)
TANIGUCHI MASAYUKI (JP)
ORITA HISAYUKI (JP)
KOBAYASHI HIRONOBU (JP)
BABA AKIRA (JP)
MINE TOSHIHIKO (JP)
NOMURA SHINICHIROU (JP)
OOYATSU NORIYUKI (JP)
TADAKUMA SATOSHI (JP)
YOSHIZAKO HIDEHISA (JP)
KANEMOTO HIROAKI (JP)
KURAMASHI KOUJI (JP)
ORII AKIHITO (JP)
TSUDA SHINJI (JP)
OKAZAKI HIROFUMI (JP)
YANO TAKANORI (JP)
SHIMOHIRA KATSUMI (JP)

International Classes:

F23L9/02; F23C99/00; F23L3/00

Foreign References:

JPH09126414A	1997-05-16
JPH0518510A	1993-01-26
JPH10122546A	1998-05-15
JPH01167514A	1989-07-03
JPH11304109A	1999-11-05
JPS58224205A	1983-12-26
JPH0518510A	1993-01-26
JP2002243112A	2002-08-28
JPH01150707A	1989-06-13
JPH09126415A	1997-05-16

Other References: