Process and apparatus for decreasing nitrogen oxides in exhaust gases

The invention relates to a process and an apparatus required for carrying out the process for decreasing nitrogen oxides in exhaust gases of any type by plasma impingement. In a known process, the exhaust gas is passed through a plasma which is built up between two or more electrode plates which are...

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Bibliographic Details
Main Authors BARIN,IHSAN,DR, LEMPERLE,MICHAEL,DR, HERFORTH,KLAUS,DR
Format Patent
LanguageEnglish
German
Published 24.09.1987
Edition4
Subjects
BLASTING
COMBUSTION APPARATUS
COMBUSTION PROCESSES
FLUES
HEATING
LIGHTING
MECHANICAL ENGINEERING
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTIONRESIDUES
SEPARATION
TRANSPORTING
WEAPONS
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Summary:The invention relates to a process and an apparatus required for carrying out the process for decreasing nitrogen oxides in exhaust gases of any type by plasma impingement. In a known process, the exhaust gas is passed through a plasma which is built up between two or more electrode plates which are arranged at a spacing of a few millimetres, parallel to each other and mutually surface-covering. However, such an apparatus is only suitable for reducing nitrogen oxides in small amounts of exhaust gases, but not for the hot and dust-laden exhaust gas arising in large amounts from industrial furnaces. Decreasing NOx in large amounts of exhaust gas is achieved according to the invention with a plasma gas burner producing a plasma gas jet to which defined media are fed which are present in the plasma gas jet as reducing gas species such as excited H2<*> molecules, H<*> atoms or other free radicals and are brought into contact with the pollutant-containing exhaust gas at temperatures of 500 to 950 DEG C and reduce the nitrogen oxides to molecular nitrogen.
Bibliography:Application Number: DE19863609763