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Capturing and Filtering Airborne Contaminants Continued from page 62
Users of extraction and filtration systems and
equipment should expect that such systems and equipment provide the health protection and high- quality workplaces expected with minimal mainte- nance efforts. Extraction and filtration systems and equipment should meet a number of require- ments, including:
particles, vapors, and gases, requiring that its fil- ters must be adaptable to the changing amounts and types of contaminating particles. For exam- ple, a large amount of coarse dust requires high- capacity filters to avoid too frequent replacement. Too low saturation conditions lead to extremely high maintenance efforts for the extraction sys- tem. On the contrary, if fine dust is largely pro- duced, coarse filters may have low capacities.
l Adaption to different workplaces.
In large production plants, attrib- utes such as “space saving,” “mobile,” or “silent” do not matter. However, such characteristics are welcome at individual and manual workstations. Filter technology should never be annoying, neither physically nor acoustically.
Capturing Hazardous Substances
Capturing contaminants from
This is a depiction of an example system that can process waste air for extraction and filtration in laser processes.
l Complete removal of all dust, smoke, vapor,
odor, and gases from a workplace environment. l
ent types of filters. Prefilters are typically used for coarse particles (such as sedimentation dust comprised of particles greater than 10 µm) to avoid premature saturation of the dust filters (for particles less than 10µm) and adsorption filters needed for finer contaminant particles.
Incremental filtration through the use of differ-
l Adaption to relevant contaminants. An effective extraction system must absorb all contaminant
l
a workplace environment is regu- lated by law in various countries. These regulations determine risk categories for specific hazardous substances, e.g. in terms of fire and explosion risks or in types of health damaging effects (carcinogenic, mutagenic, or toxic impact on reproduction). Demand for particle capture at the point of origin makes sense, because:
l Large quantities of pollutants can be captured. l There are relatively low capture efforts. l Good filtration opportunities are given.
Low energy consumption is possible. An appropriate contamination capture ele-
ment can deliver a substantial contribution to the quality of an extraction and filtration system. The capture rate and amount of contamination capture form the basis for subsequent high-grade filtration requirements, providing high overall efficiency and low residue in what is returned as clean air.
These two diagrams show the influence of distance to the required air flow.
al, twice the distance between the emission source and capturing element requires four times the exhaust performance in the extraction and filter system. This is particularly noteworthy in context of ever-increasing energy costs. Extraction and filtration in industrial envi-
ronments goes far beyond the principle of a simple vacuum cleaner. It is not simply a matter of remov- ing dirt but requires elimination of airborne haz- ardous substances that may lead to health prob- lems for workers. An important precondition for users of extrac-
tion and filtration equipment is knowledge about their materials and processes. Vendors of extrac- tion and filtration technology propose suitable solutions. They offer expert knowledge of legal reg- ulation as well as the physical and chemical char- acteristics of the media to be extracted and fil- tered. They can adapt a system for air purification that is fully suited to the operation conditions at a specific facility. Contact: ULT AG, Am Goepelteich 1, 02708
Loebau, Germany % +49-3585-41280 fax: +49-3585-412811 E-Mail:
ult@ult.de Web:
www.ult.de/en/
March, 2015
Capturing contaminants from the workplace can be effective when properly planned. In gener-
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