Nalco Fuel Tech

Nalco Chemical Company

Fuel Tech, Inc.

Daniel V Diep

M Linda Lin

Dodd W Fong

William H Sun

Christopher R Smyrniotis

Thure Von Harpe

William F Michels

M Damian Marshall

Cari M Chenanda

John E Hofmann

Ralph W Kaesler

David A Grattan

Reinhard Pachaly

Nicholas J Furibondo

Joseph B Wegrzyn

Per B Christiansen

Reduction of slagging is improved by targeting slag-reducing chemicals in a furnace with the aid of computational fluid dynamic modeling. Chemical utilization and boiler maintenance are improved.

Process for increasing the effectiveness of slag and/or corrosion

Process for increasing the effectiveness of slag control chemicals for

The present invention relates to a process for the use of a urea hydrolysate for nitrogen oxides reductions. More particularly, the process involves forming a urea hydrolysate under conditions of low pressure and introducing the hydrolysate into a combustion effluent under conditions effective for the reduction of nitrogen oxides.

Low pressure formation of a urea hydrolysate for nitrogen oxides

Improved processes and improved compositions reduce the environmental damage caused by large-scale combustion, especially in the field of NO.sub.x reduction by selective noncatalytic reduction (SNCR) in the gas phase. In one aspect, the process improves the reliability of known means, compositions and methods for reducing the concentration of pollutants in a gas stream by: preparing an aqueous solution comprising a pollutant-reducing agent and a water-dispersible polymer, and introducing the solution into the gas stream. Preferred polymers comprise high molecular weight polymers selected from the group consisting of homo and copolymers of acrylic acid and acrylamide with RSV values of at least 10, sodium acrylate acrylamide copolymers with RSV values of at least 10, sulfonmethylated acrylamide/acrylamide/acrylic acid terpolymers of RSV of at least 18, alkylene oxide polymers and copolymers, and mixtures of any of these and like polymers.

Process for pollution control

Processes and compositions enable selective noncatalytic reduction (SNCR) in the gas phase at temperatures above 950.degree. C. to reduce the environmental damage caused by NO.sub.x and related emissions. By utilizing a nitrogenous NO.sub.x -reducing agent, such as urea, in combination with a phosphate at a ratio of nitrogen in the NO.sub.x -reducing agent to phosphorous of less than about 50:1, NO.sub.x reduction is improved and carbon monoxide, nitrous oxide and ammonia are maintained at low levels.

Nitrogen oxides reducing agent and a phosphate

Improved processes and improved compositions reduce the environmental damage caused by large-scale combustion, especially in the field of NO.sub.x reduction by selective noncatalytic reduction (SNCR) in the gas phase. In one aspect, the process improves the reliability of known means, compositions and methods for reducing the concentration of pollutants in a gas stream by: preparing an aqueous solution comprising a pollutant-reducing agent and a surface active agent in ratio of surface active agent to pollutant-reducing agent of greater than 1:4000, the amount and composition of surface active agent being effective to reduce average droplet size by at least 10%, and introducing the solution into the gas stream. Preferred surface active agents have HLB values of from about 8 to about 20, and are preferably anionic or nonionic agents such as C.sub.11 -C.sub.15 secondary alcohol ethoxylates, C.sub.12 -C.sub.15 linear primary alcohol ethoxylates, alkylated diphenyl oxide disulfonates and nonyl phenol ethoxylated ethanol.

The present invention relates to a process for reducing the nitrogen oxides level in an effluent from the combustion of a carbonaceous fuel, which involves preparing an emulsion of a nitrogen oxides reducing treatment agent and a hydrocarbon having a boiling point which is lower than that of said nitrogen oxides reducing treatment agent; and introducing said emulsion into the effluent from the combustion of a carbonaceous fuel under conditions effective to reduce the nitrogen oxides level therein.

Process for adjusting the optimum effluent temperature of a nitrogen

The present invention relates to a process for the use of a urea hydrolysate for nitrogen oxides reductions. More particularly, the process involves forming a urea hydrolysate and introducing the hydrolysate into a combustion effluent under conditions effective for the reduction of nitrogen oxides.

Nitrogen oxides reduction using a urea hydrolysate

Black liquor is rendered more pumpable by reducing its viscosity by adding to the black liquor at least a part per million of a wax based on the solids present in the black liquor.

Waxes as a black liquor viscosity modifier

An aqueous 50% or higher by weight magnesium hydroxide slurry having a reduced Brookfield viscosity which contains from 0.1-5% by weight based on the weight of said slurry of a sulfomethylated polyacrylamide having from 2-30 mole percent of sulfomethyl groups and having a molecular weight of from 5,000-30,000.

Pumpable magnesium hydroxide slurries

A high solids black liquor having the property of reduced turbulent flow/drag comprising a high solids black liquor which contains a few parts per million of a water soluble terpolymer containing the repeating units in the following mole percentages: ##STR1## wherein R is a lower alkyl group from 1-6 carbon atoms, M is H or alkali metal, said terpolymer having a Reduced Specific Viscosity of at least 25.

Viscosity/drag reducing additive for high solids black liquor

A method of improving the efficiency of electrostatic precipitators for removing high resistivity particulate matter from flue gases by treating said flue gases prior to contact with the electrostatic precipitator with an aqueous solution of hydrogen peroxide with the ratio of hydrogen peroxide to SO.sub.3 being on a weight basis of at least 0.5/l.

H.sub.2 O.sub.2 as a conditioning agent for electrostatic precipitators

A non-corrosive aqueous solution of a copper nitrate which contains at least 30% by weight of copper nitrate, from 1-5% by weight of boric acid based on the weight of the copper nitrate, and from 0.2-3.0% by weight of EDTA based on the weight of the copper nitrate.

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Aurora, IL, United States of America

Daniel V Diep