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Products : RAF II Series
The RAF II utilizes two techniques to remove dust: cyclonic separation and media filtration. Dust laden air enters the filter through a low involute inlet (1) where it meets a deep particle deflector (2). This combination causes a cyclonic downward deflection of larger particles to the hopper. This separation step allows for very heavy dust loadings, reduces abrasion and lowers the energy requirement for removing remaining particles. The air then passes through the filter bags (3) which filter out the remaining fine particles. The now clean air flows into a clean air plenum (4) and exits through an outlet duct for recycling or venting to atmosphere. The dust captured on the filter media is discharged into the hopper by the reverse air cleaning mechanism (5). Superior design allows high performance with low energy use A true evaluation of a dust control system should consider energy consumption as it applies to the complete filter system-and not merely to any one component. This is why all Pneumafil dust filters are designed to function as an integral part of the total system in combination with its exceptional capabilities for reducing overall operating costs. For example, our Reverse Air Filter II is cleaned by either an economical 5, 10, 15, or 20 hp (3.7, 7.5, 11, 15 KW) motor and costs very little to operate. But more importantly, each bag is cleaned once every 120 seconds by utilizing the efficient reversed flow of processed air. This complete and systematic cleaning dramatically reduces the pressure drop across the media as well as the load demands on the complete fan system. Systems that employ random air pump cleaning may require the same horsepower, but do not clean each bag every 120 seconds. Because of this, some bags can go for an extended time without cleaning, causing higher pressure drops across the media, which increases demands on the total fan system and ultimately leads to higher energy costs. The Pneumafil involute air entry expends less overall energy than a conventional air inlet. It allows heavy dust particles to "drop out" into the filter hopper. This initial separating out of larger dust particles results in greater energy savings and less wear and tear on filter bags. Each contributes to lower operating costs. Additional energy savings are achieved by recycling plant air previously heated or cooled. Due to the short contact time of air passing through the filter, the cleaned air is not effected by outside temperatures, so no additional energy is expended to heat or cool make-up air. [ back to top ] Reduced Maintenance
A viewing port and lighted plenum allows the operator to visually inspect the bag cleaning system from outside the filter. The walk-in plenum permits top bag removal from the clean-air side. This operation simply requires extracting the drop-in cage from the snap-in bag. Our standard washable, wear-resistant bags are designed and constructed to deliver maximum efficiency. They are made of 16 oz. (454 grams) singed polyester felt with a 2 inch (5.1 cm) wear strip at the bottom to protect against abrasion. Membrane, special finish & high temperature bags are also available. [ back to top ] Sectionalized, Bolted-in Tube Sheet If the filter tube sheet is damaged, it can be easily unbolted and removed through the plenum door. Filters that employ welded-in tube sheets require cutting and welding to remove damaged plates, in addition to replacing the entire mechanical section. This can result in considerable downtime and expense. Integral Cleaning Fan and Manifold The Pneumafil Reverse Air bag cleaning operation is accomplished by effectively using a simple reverse flow fan. The fan and manifold rotate above the tube sheet and filter bags, eliminating friction and metal-to-metal contact. There are no valves, dampers or compressors to maintain. And with the absence of compressed air, there is less risk of explosion because no additional oxygen is being introduced. Conical 60° Hopper prevents bridging and the need for an additional, expensive auger discharge. Each hopper is equipped with a large, bolted inspection door and flanged outlets. Rugged High Quality Construction and Finish Constructed of carbon steel, the RAF II can withstand + 20" (508mm) W.G. and is suitable for severe environments. Filters are equipped with relief panels secured with safety chains of uneven lengths to reduce the possibility of the door becoming a projectile - another example of how Pneumafil pays attention to details. Our standard paint surface preparation meets SSPC-SP6 specifications. Every unit is primed (1.0-2.0 mils) inside and outside and finished outside with polyester epoxy paint (1.0-2.0 mils). [ back to top ]
All RAFII filters are available with pre-engineered options designed to allow customization to meet your specific application needs. Contact your local Pneumafil representative for complete details. [ back to top ] |
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All bag inspection and removal operations were designed to simplify maintenance procedures and keep maintenance costs down.
