Process for nitrogen oxides reduction to lowest achievable level

Patent · Tue Jul 20 04:00:00 EDT 1993

OSTI ID:6116573

Hofmann, J E; Sun, W H

A process is described for reducing nitrogen oxides in the effluent from the combustion of a carbonaceous fuel which is at a temperature of at least about 1,900 C using a nitrogenous treatment agent comprising urea, ammonia, cyanuric acid, ammonium carbonate, mixtures of ammonia and ammonium bicarbonate, one or more of the hydrolysis products of urea or mixtures or complexes thereof, compounds which produce ammonia as a byproduct, ammonium formate, ammonium oxalate, hexamethylenetetramine, ammonium salts of organic acids, 5- or 6-membered heterocyclic hydrocarbons having at least one cyclic nitrogen, hydroxy amino hydrocarbons, amino acids, proteins, monoethanolamine, or mixtures thereof, the process comprising: (a) determining the lowest achievable nitrogen oxides concentration for said treatment agent at the conditions existing in the effluent at the point of introduction; (b) determining the baseline nitrogen oxides concentration at the point of introduction; (c) determining the amount by which the baseline nitrogen oxides concentration exceeds the lowest achievable nitrogen oxides concentration; and (d) introducing said treatment agent into the effluent under conditions effective to reduce the effluent nitrogen oxides concentration when said determined amount is a positive number.

• Assignee: Nalco Fuel Tech, Naperville, IL (United States)
• Patent Number(s): A; US 5229090
• Application Number: PPN: US 7-725183
• OSTI ID: 6116573
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800 -- Coal
Lignite
& Peat-- Waste Management
54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION CONTROL
AMIDES
AMINES
AMINO ACIDS
AMMONIA
AMMONIUM CARBONATES
AMMONIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CARBONIC ACID DERIVATIVES
CARBOXYLIC ACID SALTS
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
CONTROL
CYANIDES
DENITRIFICATION
DISPERSIONS
ENERGY SOURCES
FLUE GAS
FLUID INJECTION
FORMATES
FOSSIL FUELS
FUELS
GASEOUS WASTES
HYDRIDES
HYDROCYANIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MIXTURES
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXALATES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
PROTEINS
STOICHIOMETRY
THERMOCHEMICAL PROCESSES
UREA
WASTES