POINT EXTRACTION

This type of nozzle extraction consists of a level surface with a centrally located inflow nozzle.

The principal process characteristic is the build-up of a constant underpressure field. In comparison with the use of funnel-shaped or hood type extraction elements, this provides for a higher extraction rate with the same exhaust air flow volume.

The effectiveness of nozzle extraction remains almost unaffected by any cross flows which may possibly occur. Other advantages are: simple, space-saving design and construction, great extraction depth and a reduction of the air quantity required by up to 30% and thereby also a reduction in operating and investment costs.

This type of nozzle extraction is used for effective extraction of emissions over wide-area emission sources, such as over containers or immersion baths. Here, the nozzles replace the standard but not very effective slotted channels in order to extract emissions from an area above a fluid surface for example. With this process, the air quantity required for complete exhaust air extraction is reduced by 30% or more.

Cross flows occurring in the area around the emission surface have only minimal influence on the nozzle extraction system, allowing best results to be achieved even over very wide areas (e.g. containers). In addition, the low space requirements of the nozzle extraction system compared with standard technology significantly improve the accessibility of the emission surface. This in turn increases the available working space, which is of particular significance in the case of galvanic baths and similar systems.