Non-stop production with vacuum drum filters

U. Hoffner*, U. Herold, BOKELA GmbH, Germany

Drum filters represent the most applied rotary filter technology. Drum filters are used for filtration, washing and dewatering of a multitude of different products in a wide range of industrial applications e.g. in the minerals, salt, chemical, pharmaceutical and food industry. A main drawback of conventional drum filters is however the troublesome and time consuming change of filter cloth. Most if not all drum filters are equipped with a cloth fixation system that has remained unchanged for several decades. Commonly known as caulking, it involves an omega shaped metal profile, the so called caulking groove welded to the filter at regular intervals to form panels. The filter media panel is then retained in the caulking groove by forcing a rope or similar type media into the caulking groove. Typically this procedure requires long downtimes of many hours and leads to a plant shut down and loss of production if no spare unit is available.

BOKELA has designed a new drum filter generation which overcomes these drawbacks to enable highest availability for non-stop production. As a special design characteristic these new drum filters have exchangeable filter cells. The single cell design takes advantage of individual and exchangeable filter elements as known from rotary disc filters. Each cell can be exchanged individually and the filter cloth is made as bag for which different types of filter media can be used. The exchangeable filter cell design allows for the provision of a second set of cells already pre-equipped with filter bags. This possibility ensures an easy and unparalleled quick re-clothing in about 1- 2 hours including filter shut down, cleaning and filter start-up. Re-clothing can be done without the use of power tools. This easy operation eliminates numerous Operational Health & Safety (OHS) issues such as hand and wrist injuries occurring with the old and obsolete methods of filter re-clothing. It ensures worker safety, ease of maintenance and maximises production since time demand for re-clothing is minimized...

Session: L8 - Continuous Vacuum and Pressure Filters
Day: 14 March 2018
Time: 13:00 - 14:15 h

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