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Patent Searching and Data


Title:
PROTECTIVE ATMOSPHERE HEATING
Document Type and Number:
Japanese Patent JPH11287566
Kind Code:
A
Abstract:

To reduce the generating amount of nitrogen oxide(NOx) by interposing a protective atmosphere between combustion and a charged matter.

Protective gas is provided into a furnace through at least on set of injectors 8 to a position near the upper surface height position 7 of the final flat bath of a charged matter at the position of a height lower than a first vertical distance above a hearth 5 and the upper position of the same. The protective gas forms a protective gas layer 12, including a space in a filler, laminated between the hearth 5 and a combustion layer 6, in the furnace whereby the most of or the whole of the charged matter is protected from combustion reaction products by the protective gas layer 12.


Inventors:
Kobayashi, Hisashi
Francis Jr., Arthur Wellington
LI, Xueping
Application Number:
JP1999000052416
Publication Date:
October 19, 1999
Filing Date:
March 01, 1999
Export Citation:
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Assignee:
PRAXAIR TECHNOL INC
International Classes:
C22B9/02; C22B9/00; C22B21/00; F27B3/10; F27B3/20; F27B3/22; F27D7/06; (IPC1-7): F27D7/06; C22B9/02; F27B3/10