Rheinisch-westfalisches Elektrizitatswerk Ag

Rheinisch-westfallisches Elektrizitatswerk Aktiengesellschaft

Other

Klaus R Hein

Georg R Gebhard

Wolfgang Glaser

Joachim Konig

Ansgar Schiffers

Paul W Franke

A method of reducing the nitrogen oxide level in flue gases from a fossil-fuel power plant in which NH.sub.3 is admixed with the flue gas as a reducing agent and the nitrogen oxides are largely converted to molecular nitrogen by reducing them with the ammonia in a reactor. Residual ammonia forms NH.sub.3 and NH.sub.4 substances which deposit and from time to time are taken up in a wash water which is disposed of by introducing it in the boiler.

Method of reducing the nitrogen oxide content of a flue gas produced by

A dry process for desulfurization of a power plant flue gas recovers, e.g. from an electrostatic precipitator, the solids which include unreacted absorbent, absorption reaction product and fly ash, and recycles at least part of this recovered solid product to contact with the flue gas for further absorption.

Process for the dry removal of sulfur dioxide from flue gas

A method of and an apparatus for the desulfurization of the flue gases from a fossil fuel power plant. A particulate absorbent is contacted with the flue gases in a dry desulfurization step, particulates being then separated from the flue gas and being utilized in part as a secondary absorbent in a subsequent scrubbing of the flue gas. The sludge from the wet scrubbing is combined with the remainder of the dried particles from the separator to form a settable composition.

Method of removing sulfur dioxide and other toxic and noxious components

An absorbent for the dry removal of sulfur dioxide and other noxious and toxic components from a combustion flue gas which consists essentially of at least one finely divided alkaline-earth compound and an additive selected from the group which consists of at least one carboxylic acid or an alkali metal, alkaline-earth metal or ammonium salt thereof.

Carboxylic acid activated dry calcium absorbent method for removing

Absorbent for the dry removal of sulfur dioxide and like components of

A building material consists essentially of an aqueous slurry of a dry residue obtained by treating a flue gas containing fly ash from a fossil fuel combustion chamber with a finely divided absorbent consisting at least primarily of calcium oxide, calcium hydroxide and calcium carbonate to permit reaction between the absorbent and sulfur dioxide in the flue gas, and dry separation of the reacted absorbent from the residual flue gas.

Method of making a building material

A method of reducing sulfur emissions in boilers fired with brown coal (as an example of low-rank solid fossil fuels with which the invention is usable) wherein finely divided calcium oxide (or calcium-oxide-containing dry materials) as additive is mixed with the fuel before the fuel is introduced into the combustion chamber of the boiler or the burner thereof. Advantageously the additive is mixed with the fuel before the milling thereof. The quantity of finely divided additive which is mixed with the fuel is varied in accordance with the sulfur concentration of the gases at the end of the combustion chamber, e.g. in response to a sulfur dioxide and/or sulfur trioxide sensor, to minimize the sulfur content of the flue gases.

Growing community of inventors

Bergheim-Ahe, Germany

Klaus R Hein