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  NOx and dinitrogen oxide separation   
   according to requirements by TA – air

Modular equipment for catalytic purification of waste air to separate NOx / N2O with heat recovery for a waste gas flow-rate of more than 100.000 m³/h

The intended amendment of TA-air presumes a reduction of NOx- in the waste gas and presents for the first time a limit value of N2O. Therefore, for this reason for separation of NOx from waste gas new equipments can be built only by means which all limit values are maintained. It is necessary to re-design the existing plants and equipments.

The catalytic purification of waste gas takes place in both the processes at different temperatures. While the conversion of N2O takes place at temperatures of about 400°C only NO and N2O can be transformed in a catalytic way already at temperatures starting from 150°C. It is necessary to use a reduction agent for catalytic transformation of NO and NO2 . In comparison with it, in case of catalytic transformation of N2O it is not necessary to do it in this way. However, the reaction can be accelerated markedly by using appropriate additive substances.

German / French / Dutch cooperation has developed a new catalytic method of NOx separation. Using this method by the use of a mixed catalyst intended limit values are attained in accordance with amendment TA-air for all NOx components. These values are even lower than those permitted. The following two variants are offered.

            Variant 1

           NOx -separation from waste gas for high-temperature process.
Waste gases which have to be purified are fed from the high-temperature process and these gases are cooled in the next stage of the process

            Variant 2

            NOx-separation from waste gas for low-temperature process.
Waste gases which have to be purified are fed from a process with low temperatures or a process with ambient temperatures and it is necessary to heat them to a reaction temperature .

Both the variants can be used for a rate of flow of waste gas of 100- 200.000 Nm³/h . With the use of special honeycomb-type catalysts it is possible to attain extremely low pressure drop values. Get yourselves our lead from technology point of view. Other information you can find under KZ.

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