| 摘要 |
<p>The present invention relates to a method of cleansing waste gases from their nitrogen oxide (NOx), hydrocarbon (HC) and carbon monoxide (CO) contents, such as the waste gases or exhaust gases originating from burners and internal combustion engines, wherein the waste gases, or exhaust gases are led through a catalyst for catalytic cleansing of the gases. The invention is characterised by bringing the lambda value (L) to a level beneath L = 1; leading the gases through a first catalyst (8) and then through a second catalyst (9); bringing the CO-content of the gas in the first catalyst (8) to a sufficiently high level to reduce NOx to N2 to an extent such as to bring said NOx content to a predetermined level; and delivering sufficient oxygen (O2) between the first and the second catalysts (8, 9) to oxidise both CO and HC to CO2 and H2O to an extent such as to reduce the CO-content of the gas to a predetermined level. The invention also relates to a gas burner.</p> |
