Selecting a Dedusting System
To aid in the selection of the best dedusting solution, a free-of-charge dedusting test at the Pelletron test lab is suggested. Once the type and quantity of fines present is determined, a suitable DeDuster® configuration can be recommended.
For the very fine dust created in dense phase systems or for high dust volumes, a dust collector with bags is usually the best solution. For systems with coarse dust, typical after dilute phase or regrind operations, a cyclone with an inline filter is the preferred technology. For systems with high streamer content, a cyclone is usually the recommended selection. As a result of testing of over 3,000 kinds of bulk material, Pelletron has the experience to select the proper system configuration to meet any customer requirements.
Besides the selection of the suitable system configuration, one of the most important design considerations for a dedusting system is the sizing of the fans. Fan sizing is affected by the length, diameter and number of elbows in the duct work, the pressure loss due to filters in the system and the pressure loss and air volume requirements of the DeDuster®. Pelletron engineers take these variables and the properties of the material to be cleaned into consideration when determining the air volume and pressure needed for the best cleaning results.
The manual solution for fan air management is mechanically operated dampers. These dampers are adjusted at start-up and can be readjusted easily as required for product changes. Pelletron also offers variable speed drives for fans which can be operated from a remote control stations. These drives allow for proper system balance and affect energy consumption giving the end-user the ability to manage costs.
Some applications require the use of HEPA-filters, in addition to the standard system configuration. Because of the high pressure loss that results from the use of these filters, the design and selection of the fan(s) becomes even more critical. HEPA-filters are common in clean room applications and when dedusting plastic pellets for use in the electronic and optical industries.