Process using two-stage boiler injection for reduction of nitrogen

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专利权人:

NOELL, INC.

发明人:

JONES, DALE G.

申请号：

US19910769588

公开号：

US5240689(A)

申请日:

1991.10.02

申请国别(地区):

美国

年份:

1993

代理人:

摘要：

This invention relates to methods and apparatus for reducing NOx in combustion effluent gases which comprise a two-stage injection process. NHi precursors (such as liquid-phase urea or ammonium hydroxide, or the like) are injected into the flue gas at temperatures greater than 1400 DEG F. in a first injection zone to reduce NO to nitrogen. This step is followed by injecting a peroxyl initiator, such as a hydrocarbon material (for example, methanol) into the flue gas at temperatures less than 1400 DEG F. to oxidize residual NO to NO2 in a second injection zone.

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