Fox Solids Conveying Eductors for Pneumatic Conveying with No Moving Parts

Fox Solids Conveying Eductors
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Fox Venturi Products (Fox Valve) has been the leading global supplier of venturi eductors and venturi transport systems for dilute phase pneumatic conveying of powders, pellets, and bulk solids since 1963. Fox Eductors, also referred to as jet pumps, enable the use of low pressure air (below 14 psig or 1 bar) to be used to move powders, pellets, and bulk solids with no moving parts. These venturi eductor systems can be used to convey product at up to 15 tons per hour over distances up to 500 feet.

Fox Venturi Eductors – What Are They?

Fox Venturi Eductors are used to feed powders, pellets, and bulk solids into a pneumatic conveying system. Because they have no moving parts, they can – and often do! – operate almost entirely maintenance-free. Feedback from customers often reveals five, ten, or even fifteen years of maintenance-free operation.

How Are They Used In Pneumatic Conveying Systems?

Fox Venturi Eductors are used to introduce bulk solids such as powders, pellets, flakes, and particulates into positive pressure conveying systems. They offer end users and system designers a way to eliminate rotary valves from conveying systems where rotary airlocks/rotary valves simply cannot perform adequately. This often occurs with very fine, abrasive, fragile, or high-temperature solids.

Rotary Valve and Eductor
Eliminating the rotary airlock, left, with a Venturi eductor, right, permits
product feed with no moving parts for maintenance-free conveying.
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Why Are Eductors Used In Pneumatic Conveying Systems?

Fox Venturi Eductors Have No Moving Parts – allowing for maintenance-free feeding of bulk solids. In applications involving fine, abrasive, or irregularly-shaped products, this is an enormous advantage. Replacement of existing rotary airlocks with venturi eductors makes for simpler, more reliable conveying systems. Designing with eductors from the beginning ensures the most reliable product feeding available.

No Blowback – All rotary airlocks/rotary valves have blowback – also known as fugitive dust or leakage. If the product conveyed is fine or abrasive, blowback can cause extreme wear problems. Even with free-flowing products, blowback can be a problem, causing bridging and housekeeping problems, or even an explosion hazard. When installed beneath baghouses, screw conveyors, or dust collectors, airlocks can be a major source of fugitive dust emissions, which are eliminated after a retrofit to Fox eductors.

No Mechanical Shearing/Product Damage – Eductors minimize the shearing, smearing or degradation of products common with rotary airlocks. And, of course, safety is simply not a concern with Fox eductors.

Where Does My Industry Use Fox Eductors?

Although we have sold Fox eductors/Venturies/Jet Pumps for use in just about every industry that requires pneumatic conveying, we can list a handful of industries here where Fox eductors have been used for decades, in many, many installations. Please visit our Case Study Request Page to request detailed application information about Venturi conveying systems in your industry.

Conveying: Activated carbon, lime, calcium carbonate, Trona and other additives for flue gas desulferization (FGD,) coal, coke, biomass, chopped tires and other alternative fuels; sorbents for SOx reduction in CFB’s

Conveying: Milk and non-dairy powders from spray dryers; Coffee beans, starch, sugar from bulk bags; Powdered tea from screeners; Rice; Breakfast cereal from extruders and dryers; Snack food extrudate from extruders; Frozen peas from IQF; Whole peanuts from sorters; Minor ingredients to mixing/batching (salt, sugar, spices, vitamins, flavorings, etc.;) Recycled product from packing rooms

Conveying: CKD at up to 800° F; Portland cement at up to 20,000 lbs/hr; Alternate fuel injection (shredded carpets/plastic/tires/paper; biomass, rice hulls.) Kiln spill at 1600° F

Conveying: Since 1963, Fox Eductor Systems have been conveying plastic pellets with reduced angel hair and fines from hundreds of extruders and compounding lines; Fiberglass/Mica filled pellets with clean-in-place, ceramic-lined wear resistant eductors; Conveying plastic regrind, chips, and flakes reliably with no moving parts.

Conveying: Activated Carbon, Sodium Bicarbonate, Hydrated Lime, Trona, Pulverized Limestone into ducts and stacks; Sorbent injection in fluidized bed boilers for SOx reduction

Conveying: Copper and nickel alloys at 1000°+ F; Mica, talc, quartz, and perlite ore from dust collectors; Copper pellets at 400 lbs/ft3 bulk density.

Building Products

Conveying: Phenolic resin and sawdust for chipboard; Gypsum for sheet rock; Pumice powder for grout; Roofing granules; Sand, ceramic, and aggregate for floor tiles

Conveying: Silica, Sand, Glass Frit, Ceramic dust, Mica

Foundries

Conveying: Foundry dust from dust collectors; Innoculant to cupolas; Metal grit from grinding stations; Sand and bond

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How to Use Eductors in a Pneumatic Conveying System

Designing New Systems with Venturi Eductors

As with any conveying system, the three basic questions are: What product? How much? How far? Send us a completed data sheet and Fox engineers will prepare a Performance-Guaranteed quotation on an eductor or a complete conveying system. The quotation will include all relevant operating data.

Limitations:

  • For Rates up to 15-20,000 lb/hr
  • For Distances up to 300 ft

Retrofitting Existing Equipment

Retrofitting existing systems with Fox eductors can result in very significant improvements. These may include:

  • Eliminate airlock wear
  • Reduce product damage/degradation
  • Avoid dust emissions and leakage
  • Facilitate clean-outs if cross- contamination is critical
  • Reclaim otherwise discarded product

Fox Eductor/Blower Sub-Systems

Fox Valve can provide almost all of the equipment necessary to enable easy, quick installation of a fully-guaranteed pneumatic transport system.

Fox Eductor driven by PD Blower
A Fox Eductor is driven by a
positive displacement blower package
Eductor Blower Cart Mounted
A Fox Eductor and regenerative blower are
mounted on a mobile cart.
















Blowers

Fox can provide any type of blower required, as part of a perfectly matched, guaranteed eductor/blower system—including all required accessories, filters, hose, fittings, etc.

Download Bulletin 302 for detailed information about Fox eductor/blower sub-systems, or request that we mail you a color copy. Click to Download Bulletin 302.

Multiple Eductors Driven by One Blower

Eductor systems often use one blower to drive many eductors, making for surprisingly simple systems when handling material from multiple outlets, as is common with dust collectors or cyclones, as illustrated below.

Fox Eductor Multi Cyclone
Conveying from Multiclones – One blower drives (16) Eductors,
conveying ashat up to 900° with No Moving Parts
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