Mulit-stage process for reducing the concentration of pollutants in an effluent

Patent · Tue Oct 11 00:00:00 EDT 1988

OSTI ID:6807567

Epperly, W R; Peter-Hoblyn, J D; Sullivan, J C

This patent describes a process for reducing the concentration of nitrogen oxides in the effluent from the combustion of a carbonaceous fuel, the process comprising: a. injecting a first treatment agent comprising urea or ammonia into the effluent at a first temperature zone where the effluent is at a temperature of greater than about 1700F; b. injecting a second treatment agent comprising urea or ammonia, each of which further comprises an enhancer selected from the group consisting of hexamethylenetetramine, an oxygenated hydrocarbon, a hydroxy amino hydrocarbon, an amino acid, a protein-containing composition, guanidine, guanidine carbonate, biguanidine, guanylurea sulfate, melamine, dicyandiamide, calcium cyanamide, diuret, 1,1' -azobisformamide, methylol urea, methylol urea-urea condensation product, dimethylol urea, methyl urea, dimethyl urea, and mixtures thereof into the effluent at a second temperature zone where the effluent temperature is about 1350F to about 1750F; and c. injecting a third treatment agent comprising a composition selected from the group consisting of paraffinic, olefinic, aromatic, oxygenated and hydroxy amino hydrocarbons, and hydrogen peroxide, and mixtures thereof into the effluent at a third temperature zone where the effluent temperature is below about 1400F; wherein the treatment agents are injected under conditions effective to reduce the effluent pollution index.

• Assignee: Fuel Tech, Inc., Stamford, CT
• Patent Number(s): US 4777024
• OSTI ID: 6807567
• Resource Relation: Patent File Date: Filed date 6 Mar 1987
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
54 ENVIRONMENTAL SCIENCES
COAL
COMBUSTION
GASEOUS WASTES
DENITRATION
NITROGEN OXIDES
REMOVAL
REDUCING AGENTS
CHEMICAL COMPOSITION
AIR POLLUTION CONTROL
AMINES
AMINO ACIDS
AMMONIA
AROMATICS
COMBUSTION PRODUCTS
HYDROCARBONS
HYDROGEN PEROXIDE
PROTEINS
UREA
VERY HIGH TEMPERATURE
AMIDES
CARBONACEOUS MATERIALS
CARBONIC ACID DERIVATIVES
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDRIDES
HYDROGEN COMPOUNDS
MATERIALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PEROXIDES
POLLUTION CONTROL
THERMOCHEMICAL PROCESSES
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
200202 - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)