Process for reducing nitric oxide emission during the combustion of solid fuels
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United States of America Patent
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Jul 21, 1992
Grant Date -
N/A
app pub date -
Aug 26, 1991
filing date -
Dec 27, 1989
priority date (Note) -
Expired
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Abstract
In a process for reducing the nitric oxide emission during the combustion of solid fuels, the flue gases leaving from a main combustion zone (2) consecutively flow through two reduction zones (6,9). The first reduction zone (6) is operated hypostoichiometrically at temperatures above 1,000.degree. C. and while adding a reducing fuel, while the second reduction zone (9) is operated hyperstoichiometrically at temperatures from 950.degree. C. to 1,000.degree. C. and in the presence of nitric oxide-reducing substances.
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