Cement Americas

WIN 2019

Cement Americas provides comprehensive coverage of the North and South American cement markets from raw material extraction to delivery and tranportation to end user.

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www.cementamericas.com • Winter 2019 • CEMENT AMERICAS 23 FEATURE M ost industrial dust collection systems use a baghouse or a cartridge collector. Whether your bag- house or cartridge collector is 50 CFM or 100,000 CFM, there are advantages to putting a cyclone before the bag- house or cartridge collector. Here are five advantages to utilizing a cyclone in a dust collection system, according to Aerodyne Environmental. 1. Increased Removal Efficiencies. Cyclones will increase your total dust collection efficiency when added before an existing baghouse. Cyclones remove the larger, coarser dust before the particulate reaches the baghouse. This helps to lighten the load on fil- ters, which results in less dust in the airstream and overall higher removal efficiency for the whole system. Most cyclone dust collectors will remove 99 percent of dust 20 micron and larger at a specific gravity of 1 and 33 percent at 5 micron. If you have 100 lb./h of dust above 20 micron and 100 lb./h of dust between 5 and 20 micron, a baghouse will provide 99 percent efficiency with 2 lb./h discharge to atmosphere. When a cyclone is used in tandem with the bag- house, the discharge to atmosphere is 0.68 lb./h. Additionally, cyclones increase removal efficiencies when dealing with hydroscopic or sticky appli- cations. A cyclone will remove most of the hydroscopic particulate before it reaches the baghouse. This helps to prevent the baghouse from getting jammed up with the particulate. 2. Longer Filter Life. Baghouses and cartridge collectors require com- pressed air to knock off the dust. The use of the compressed air forces the bag to expand around its cages during high pressure bursts. The constant expansion of the bag causes it to wear out at a faster rate. In addition, when In the Bag Here Are the Top 5 Reasons to Use a Cyclone Before a Baghouse or Cartridge Collector. By Mark S. Kuhar the bags and cartridges collect dust build up, they need to be replaced. The higher the dust loading of the machine, the more often the bags or cartridges will have to be cleaned or replaced. Putting a cyclone ahead of the baghouse will remove most of the larger dust from the baghouse, there- by minimizing the amount of dust coming into the baghouse or cartridge collector. If the system is equipped with a clean on demand feature, the bag cleaning mechanism will not have to fire as often and will help lengthen the bag life. 3. Recovery of Product. If the dust being collected is valuable (such as gold or silver) or needs to be/can be reused, simply using a baghouse or cartridge collector will cause the material to get lost on the filters. A cyclone doesn't require any filters and all the recovered material will eventually be removed through the dust discharge valve. If your material can't be contaminated (such as color), a cyclone can be easily washed out before cross contamination occurs, where as with cartridge collectors, the filters will need to be changed, due to the dust they retain. This is a time consuming and costly procedure. Additionally, if new filters are needed, they have to be pre-coated or they will have a lower removal efficiency until they build up a coat in the process. 4. Easy Maintenance. Baghouses and cartridge collectors are extreme- ly high maintenance. They require confined space entry to remove and replace the bags. Furthermore, bag replacement can be a time consuming process. Many plant operators hire

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