Luhr Filter - Air Pollution Control for Mine Sites

Luhr Filter has been designing robust solutions for air pollution control for over 30 years. This experience is enriched and supported by its close association with Luhr Filter of Germany, a global leader in the industry for over 70 years.

With thousands of successful major projects behind us, we have perfected and harnessed our core strengths - innovative technology, broad knowledge, project management expertise and experience - to meet the diverse and challenging needs of our customers.

Luhr's unique design of fabric filters

Our range of fabric filters is one of only a few on the market that offers reverse air and reverse pulse cleaning using both horizontally and vertically-mounted oval filter bags. Our bag configuration offers a more compact and space-efficient solution for the equivalent cloth area of tubular bag designs, providing sought-after flexibility in space utilisation and plant configuration.

Combined with our modular construction, this allows design flexibility in both the vertical and horizontal planes, meaning either low head height or small footprint constraints can be achieved.

The Luhr range of fabric filters

The Luhr Filter is designed for longevity by using heavy-duty construction and avoiding crevices where corrosion can take hold. The Luhr dust filter products include:

• DFV - compact horizontally mounted oval bag pulse jet cleaned fabric filter
• SDFV - compact vertically mounted oval bag pulse jet cleaned fabric filter
• DF - horizontally mounted oval bag pulse jet cleaned fabric filter
• SDF - vertically mounted oval bag pulse jet cleaned fabric filter
• DFK - multiple compartments, horizontally mounted oval bag pulse jet offline cleaned fabric filter
• SDFK - multiple compartments, vertically mounted oval bag pulse jet offline cleaned fabric filter
• MWF - horizontally mounted oval bag reverse air offline cleaned fabric filter
• SMWF - vertically mounted oval bag reverse air offline cleaned fabric filter
• DWF - horizontally mounted oval bag pulse jet offline cleaned fabric filter
• SDWF - vertically mounted oval bag pulse jet offline cleaned fabric filter
• DFR - vertically mounted tubular bag pulse jet cleaned fabric filter

Wet scrubbers for particulate, fume and gas removal

Our range of wet scrubbers for particulate, fume and gas removal is designed to deliver high collection efficiencies to comply with the most stringent environmental regulations. The scrubbers can achieve efficiencies of up to 99.9% depending on the application.

Luhr Filter offers five principal customisable designs to meet your individual requirements:

• ZK Centrifugal Scrubber, which features no moving parts, is primarily used for high dust load applications
• NVK Dynamic Scrubber includes an integral wet fan to create highly turbulent conditions, which forces the dust particles into the scrubbing liquid. The integral fan also provides the process induced draft
• High-efficiency Venturi scrubber, which atomises the scrubbing liquid to entrain the dust and fume particles which then coalesce into larger droplets enabling them to be removed from the gas stream. This enables collection of smaller particles, well into the submicron range, when compared to the ZK or NVK models
• RN Rotary Scrubbers deliver the energy for the atomisation of the water via an externally driven high-speed impeller. Since this energy is not drawn from the gas stream, the unit has a low pressure loss and offers a high collection efficiency regardless of the volume handled. These features make it ideal for retrofit solutions
• FK Packed Bed Scrubbers are effective for acid mist, odour and gas absorption. The gas to be treated flows vertically upwards through a packed bed column with the scrubbing liquid cascading in the opposite direction

Dry scrubbers for acid gas, dioxin and heavy metal removal

The primary function of the dry scrubber is to remove acid gases (HF, HCI, SOx), dioxins and heavy metals from combustion processes. This is accomplished by introducing sorption materials such as lime, bicarbonate, and activated carbon into the Luhr Filter conditioning rotor reaction chamber.

The conditioning chamber incorporates a perforated rotor containing ceramic grinding spheres, which break up agglomerated particles, and evenly disperses the sorption powder into the gases for efficient neutralistion or sorption of the pollutants.

Flat-tube heat exchangers

Due to the temperature limitations of filter fabrics, the Luhr Filter flat-tube gas-to-air heat exchangers have been developed to cool particle laden exhaust gases to a temperature where fabric filters can be employed.

The heat exchanger is constructed from horizontal steel tubes of a size, shape and arrangement similar to that of the Luhr oval bag fabric filters.The heat is transferred by forced convection with cooling air being forced through the cooling tubes by axial type fans whilst the exhaust gases pass over the outside of the tubes. There is no mixing of the exhaust gases with the heated cooling air so the heat recovered can be utilised for heat recovery or product drying.