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  • +243 892 020 000
  • sales@ewrefining.com

DUST FILTRATION

EWR has become a world leader in the supply and manufacture of filter bags, filter cages, CrosTex with ePTFE membrane technology, and other specialised dust filtration services and solutions. Every product and material is carefully selected and constructed with precision to meet the highest international and ISO standards.

DustFiltration

FILTER BAGS

Today’s stricter environmental control calls for improved dust filter media and design. Our Filtration meets these requirements with the best filter media on the market.

Our dust filter bags are made from a wide selection of filter media.

Polyester and Acrylic media are the most common dust filter media for low temperatures.

PPS, Aramid/Nomex, Kermel Tech, and P 84 and glass are used for higher temperatures.

Products include Water and Oil repellency for sticky / moist dusts, and PTFE dipped treatments for acid resistant applications.

Durashield Blue

Used in abrasive dusts, while PTFE membranes (Cros-Tex) is used for improved particle retention up to 0.2 – 0.3 microns.

Glass Tex
Crosible’s new range for high temperature applications, where hot embers and high temperature surges occur.
Supa Seals
Often used to prevent bags from falling out of irregular tube sheets, and improve the snap band seal.

FILTER CAGES

EWR cages are custom built in 10 / 12 / 16 / 20 longitude wires using mostly 3.15 and 4mm steel wires.

A variety of stainless steel and carbon steel are used with various finishings:

  • Powder coating for up to 150 degree C
  • Black edge primer for higher temperatures
  • Electro galvanising to accommodate conductive / antistatic bags

Cage top designs vary from:

  • Venturis
  • Ring tops
  • Split collars
  • Flat collars

In most cases an end cap is used for the base of our cages.

For longer cages we design a knuckle joint, or sometimes a ring joint to extend the cages.

Elongated cages are provided with special knuckle joints or ring joints.

Dalamatic cages and Filcomatic cages are available ex-stock.

Cages can be custom built to suit any requirement.

Cages are custom made to suit any baghouse application:

  • 12, 24 wire cages
  • Galvanized/Power coated
  • Venturies
  • Dalamatic cages
  • Knuckle joint

COATINGS & TREATMENTS

EWR is constantly investing in researching high quality coatings and treatments of filtration media.

PYRO-FLO® is a new range of high temperature needle felts yielding ultra-low, sub-micron particle retention.

What is CrosTex?
CrosTex is a micro-porous Teflon membrane (ePTFE) bonded to the surface of conventional filter media, to both woven cloths and needlefelts.
Why use CrosTex media?
Dust retention efficiency of 99.99% can be achieved with improved air flow, lower energy consumption and improved dust cake release.
1. CrosTex offers the highest filtration efficiency.
CrosTex will meet the most stringent regulation standards for emission control. The average pore size of CrosTex is between 0.05 and 1.0 micron. These microscopic pores are created in a three-dimensional membrane structure. The pores are smaller than most airborne or waterborne particles, yet large enough to allow for passage of gas molecules.
Due to the 99, 99% efficiency rate of the membrane, it is not uncommon to achieve emission levels of 0.01 mg/m³. Test results using CrosTex showed forty times less emissions than the standard needlefelt media.
2. CrosTex ensures lower operating pressure drops.
Depth-filtration verses Surface-filtration.
Conventional Depth Filtration
When using conventional needlefelt media, the initial layer of dust penetrates to a certain depth into media and then a layer of dust accumulates on the surface. The initial layer of dust is permanently trapped below the surface of the media. This works effectively in the initial stages of the filter process but later it causes a pressure drop. It could take hours or weeks to occur but at that point the advantages of CrosTex become apparent.
Depth filtration may not be effective on submicron particles, where bleed-through emissions causes loss of product. This is known as “puffing” – pin-hole perforations caused by the cleaning process.
CrosTex Surface Filtration
CrosTex allows a consistent air-flow rate throughout the life of the filter bag because the filtration process occurs on the surface of the media. The ePTFE membrane prevents dust particles penetrating the fabric and therefore avoids a pressure drop during the lifespan of the filter bag. CrosTex permeability rate is 8-12 CFM, which is much lower than conventional needlefelt (25-70 CFM) but the difference is more than compensated due to no pressure drop occuring.
3. CrosTex has excellent dust-cake release properties.
The ePTFE membrane has the smoothest, non-stick surface. Its hydrophobic property helps to discharge sticky moist dust particles which on conventional media would lead to blinding of the media.
Baghouses using CrosTex filter bags require 30% less aggressive pulse to discharge the dust. Pulsing at 4-5 bars instead of 6-7 bars results in less mechanical damage to the filter bag.
4. CrosTex offers greater airflow and lower energy consumption.
With minimal pressure drop during the life of the filter bag, CrosTex operates consistently at a higher air flow rate. The average 1:1 m³/m² air-to-cloth ratio with conventional media needs to be maintained but with CrosTex, it can be increased to 1:1,5 m³/m².

Where CrosTex filter bags are specified for a new baghouse, the size of the baghouse can be reduced, which means less capital and operational costs, ensuring greater profitability.

5. CrosTex is more cost effective.
Although CrosTex filter media is more expensive than conventional filter media, the benefits outweigh the initial costs because CrosTex has a longer life expectancy.
CrosTex membrane can be laminated onto the following media:
  • Polyester needlefelt
  • Antistatic (Epitropic) polyester needlefelt.
  • Polypropylene needlefelt
  • Homopolymer Acrylic
  • PPS (Torcon / Ryton / Procon)
  • Aramid (Nomex/ Conex)
  • P84 Polyimide.
  • Woven glass fiber

FleurX is a new range of high temperature needle felts yielding ultra-low, sub-micron particle retention.

REQUENTLY ASKED QUESTIONS

Some frequent questions about filtration products and process

Incorrect criteria given, incorrect fabric and working conditions.

Passing through the normal operating temperature of baghouse (moisture forms).

It provides a better sealing edge for old or damaged plates.

This type of plate allows further de-watering of the product captured between plates​.

Depends on the process and what’s being processed.

It provides a better sealing edge for old or damaged plates?.