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The Herding PHARMEX dust extraction system is the DEKRA-EXAM-approved alternative to regenerate submicron particulate filters.
The Herding PHARMEX is designed to be resistant to pressure surges so that organic dust with a maximum explosion pressure of 10 bar and a KSt value of 250 bar m/s can be separated without any expensive tertiary explosion protection measures.
The filter housing consists of a welded construction with a smooth surface. At bottom right are the raw gas compartment with Herding sinter-plate filters and the dust discharge hopper to which an assortment of discharge devices can be attached. The clean gas compartment as expansion compartment lies mainly in the left half, with the control unit in the front wall. A submicron particulate filter can be provided as a secondary filter in the lower area of the clean gas compartment.
• Safe system concept with no tertiary measures
• The plant can be installed at any point in the production or engineering area
• Low clean gas concentration < 0.2 mg/m³ after just the first filter stage (depending on the dust)
Design measures make a rupture disk or explosion suppression superfluous.
Contamination is possible when the dust is emptied, but also in the first and second filter stage whenever the filter is occasionally changed. Permissible dust levels at the workplace vary according to the active ingredients contained in the dust. The specific measures required in each individual case can be derived from, for example, the OEL or OEB values, as contained in Guideline M057 issued by BG Chemie (the German trade association for the chemicals industry). In an extended matrix, Herding has assigned suitable solutions in terms of dust disposal and filter change to all potential hazards.
A step in this direction is the sinter-plate filter with service life expectancies of more than 10 years. A central dust disposal system also reduces risk, whereby Herding as a system supplier also offers retroactive conversion as well.