Abstract: A process for removing impurities, in particular oxides of sulphur (SOx) and/or oxides of nitrogen (NOx) from oxygen-containing gas streams by scrubbing with at least one washing agent is described. In order to achieve effective gas purification in an economical manner even in the case of so-called large “oxyfuel” furnaces which operate with oxygen as fuel gas, it is proposed to convert the impurities at an elevated pressure of at least 2 bar with at least one basic constituent of the washing agent into salts and to wash out said impurities as dissolved salts.

Abstract: The invention relates to a process for the removal of NO and NO2 from an oxygen-containing gas stream, which comprises a scrubbing step in which the gas stream is brought into contact with an ammonia-containing scrubbing solution, NO is oxidized to form NO2 by means of the oxygen present at a pressure of at least 2 bar and temperatures of from 15° C. to 60° C. and at least part of the NO2 present in the gas stream is converted by means of the ammonia-containing scrubbing solution into ammonium nitrite and a downstream decomposition step in which the ammonium nitrite present in the scrubbing solution is thermally decomposed into elemental nitrogen and water, where the decomposition step is carried out at temperatures of from 121° C. to 190° C. and a pressure of from 2 to 40 bar. The invention likewise relates to a plant for operation of the process of the invention.

Abstract: The invention relates to a process and an apparatus for the treatment of a carbon dioxide-containing gas stream from a large-scale combustion plant, in particular of a power station. The gas stream is separated in a carbon dioxide purification stage R into a gas substream having an increased carbon dioxide content and a gas substream having a reduced carbon dioxide content. The gas substream having an increased carbon dioxide content is fed to a further use and/or storage S. In particular, compression of the carbon dioxide under the ground can reduce the emission of gases which affect the climate. To increase the proportion of compressible CO2, it is proposed that the gas substream having a reduced carbon dioxide content is fed to a pressure swing adsorption stage PSA in which a fraction which is rich in carbon dioxide and a fraction which is low in carbon dioxide are produced.

Abstract: The invention relates to a process for the removal of NO and NO2 from an oxygen-containing gas stream, which comprises a scrubbing step in which the gas stream is brought into contact with an ammonia-containing scrubbing solution, NO is oxidized to form NO2 by means of the oxygen present at a pressure of at least 2 bar and temperatures of from 15° C. to 60° C. and at least part of the NO2 present in the gas stream is converted by means of the ammonia-containing scrubbing solution into ammonium nitrite and a downstream decomposition step in which the ammonium nitrite present in the scrubbing solution is thermally decomposed into elemental nitrogen and water, where the decomposition step is carried out at temperatures of from 121° C. to 190° C. and a pressure of from 2 to 40 bar. The invention likewise relates to a plant for operation of the process of the invention.

Abstract: The invention relates to a method and an apparatus for treating a carbon dioxide-containing gas stream. Precompressed raw gas stream (1) is partially liquefied in a cryogenic carbon dioxide purification stage (2, 3, 4). Part of the resultant liquid is used to obtain a gas stream having an elevated carbon dioxide content (7). From the non-liquefied raw gas, a gas stream having a reduced carbon dioxide content is obtained. This vent gas stream is expanded and the refrigeration generated is recovered for cooling the raw gas stream. The carbon dioxide gas stream is compressed (8) to a final pressure and fed to further utilization and/or storage. Another part of the liquid from the cryogenic carbon dioxide purification stage is fed in a liquid phase (9) to further utilization and/or storage (10).

Abstract: The invention relates to a method and a device for treating a carbon-dioxide-containing gas stream, in particular from a large-scale fired plant, e.g. from a power plant. The precompressed gas stream is separated in a carbon dioxide purification stage into a gas substream having an elevated carbon dioxide content (carbon dioxide product stream) and a gas substream having a decreased carbon dioxide content (vent gas stream). The carbon dioxide product stream is fed to further utilization and/or storage. In particular, by injecting the carbon dioxide underground, the emission of gases harmful to the climate can be reduced. For improving the energy efficiency, it is proposed that the vent gas stream is expanded in at least one expansion turbine and both the resultant kinetic energy and the resultant refrigeration are utilized for energy recovery.

Abstract: A process for removing impurities, in particular oxides of sulphur (SOx) and/or oxides of nitrogen (NOx) from oxygen-containing gas streams by scrubbing with at least one washing agent is described. In order to achieve effective gas purification in an economical manner even in the case of so-called large “oxyfuel” furnaces which operate with oxygen as fuel gas, it is proposed to convert the impurities at an elevated pressure of at least 2 bar with at least one basic constituent of the washing agent into salts and to wash out said impurities as dissolved salts.

Abstract: The invention relates to a process and an apparatus for the treatment of a carbon dioxide-containing gas stream from a large-scale combustion plant, in particular of a power station. The gas stream is separated in a carbon dioxide purification stage R into a gas substream having an increased carbon dioxide content and a gas substream having a reduced carbon dioxide content. The gas substream having an increased carbon dioxide content is fed to a further use and/or storage S. In particular, compression of the carbon dioxide under the ground can reduce the emission of gases which affect the climate. To increase the proportion of compressible CO2, it is proposed that the gas substream having a reduced carbon dioxide content is fed to a pressure swing adsorption stage PSA in which a fraction which is rich in carbon dioxide and a fraction which is low in carbon dioxide are produced.