METHOD OF BURNING PULVERIZED COAL AND BURNER FOR COMBUSTION

Japanese Patent JP2565620

B2

PURPOSE: To enhance an effect of suppressing the generation of NOx by jetting a fuel-air mixed gas containing pulverized coal from a burner, jetting secondary air and tertiary air concentrically from the outer periphery of the burner and forming a primary combustion region and a secondary combustion region to reduce NOx.
CONSTITUTION: The subject burner for combustion of pulverized coal comprises pulverized coal nozzles 12, 13 adapted to feed a fuel-air mixed gas composed of pulverized coal and primary air, and secondary and tertiary air nozzles 17, 18. A primary combustion region 21 where combustion is performed with the fuel-air mixed gas and the secondary air in the amount of air for combustion less than a theoretical amount of air is formed in the vicinity of the forward end of the burner, and a secondary combustion region 22 where further combustion of the combustion products from the primary combustion region 21 by tertiary air is formed in the wake of the primary combustion region 21. After ammonia compounds and cyanic compounds have been produced from the N content in coal in addition to NOx in the primary combustion region 21, these nitrified compounds are allowed to react with the combustion gas in the secondary combustion region on reduce NOx. The pulverized coal nozzles 13 are arranged in the outer periphery of the tertiary air nozzles 18.

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AZUHATA SHIGERU
NARATO KYOSHI
ARASHI NORIO
INADA TOORU
SOMA KENICHI
OOTSUKA KEIZO
HISHINUMA TAKAO

JP15478592A

December 18, 1996

June 15, 1992

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HITACHI SEISAKUSHO KK
BABUKOTSUKU HITACHI KK

F23C99/00; F23D1/00; (IPC1-7): F23C11/00; F23C11/00; F23D1/00

JPS56119406A

Unuma Tatsuyuki

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