Process using two-stage boiler injection for reduction of nitrogen
A method is described for reducing NO[sub x] in combustion effluent gases consisting essentially of two injection steps, the injection steps comprising: (a) injecting one or more NHi precursor materials selected from the group consisting of ammonia, urea, cyanuric acid, biuret, triuret, ammelide, or mixtures thereof, in the absence of peroxyl initiator materials, into a flue gas in a first injection zone, wherein the flue gas has a temperature of from about 1,450 F to about 1,900 F, to thereby reduce a portion of the NO to N[sub 2]; and (b) injecting one or more hydrocarbon peroxyl initiator materials selected from the group consisting of propane, benzene, ethane, ethylene, n-butane, n-octane, methane, methanol, isobutane, pentane, acetylene, methyl alcohol, ethyl alcohol, acetone, glacial acetic acid, ethyl ether, propyl alcohol, nitrobenzyl alcohol, methylethylketone, propylene, toluene, formaldehyde, camphor, ether and glycol, or mixtures thereof, in the absence of NHi precursor materials, into the flue gas in a second injection zone, wherein the flue gas contains NO and NH[sub 3] from the first injection zone and is at a temperature of less than about 1,400 F, to thereby reduce ammonia slippage and oxidize residual NO to NO[sub 2].
- Assignee:
- Noell, Inc., Herdon, VA (United States)
- Patent Number(s):
- US 5240689; A
- Application Number:
- PPN: US 7-769588
- OSTI ID:
- 5976280
- Resource Relation:
- Patent File Date: 2 Oct 1991
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
FLUE GAS
SCRUBBING
NITROGEN OXIDES
AIR POLLUTION CONTROL
ACETIC ACID
ACETONE
ACETYLENE
ALCOHOLS
AMMONIA
BENZENE
BOILERS
BUTANE
CAMPHOR
ETHANE
ETHANOL
ETHERS
ETHYLENE
EXHAUST GASES
FLUID INJECTION
FORMALDEHYDE
GLYCOLS
KETONES
METHANE
METHANOL
MIXTURES
NITRIC OXIDE
NITROGEN
NITROGEN DIOXIDE
OCTANE
PENTANE
PRECURSOR
PROPANE
PROPANOLS
PROPYLENE
REDUCTION
SYNTHESIS
TOLUENE
UREA
ALDEHYDES
ALKANES
ALKENES
ALKYLATED AROMATICS
ALKYNES
AMIDES
AROMATICS
CARBONIC ACID DERIVATIVES
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
DISPERSIONS
ELEMENTS
FLUIDS
GASEOUS WASTES
GASES
HYDRIDES
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
MONOCARBOXYLIC ACIDS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
TERPENES
WASTES
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)
010800 - Coal
Lignite
& Peat- Waste Management