| 摘要 |
<p>The present invention relates to a nozzle unit for the supply of gas into a liquid comprising two or more annular nozzles (5) one after the other in the direction of flow. The nozzles are angled to give a restriction in the direction of flow, and each nozzle overlaps the following nozzle. Each nozzle has one or more apertures for the supply of gas at the overlap.</p> |
