Filtration

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Filtration Systems

Filtration

Filtration techniques are applied to the collection and filtration of fumes which can be defined as particles of 0,5 - 1,0 microns and less. They may cover a wide range of applications from the oil mist from machining coolants, to the oil based lubricants used in beverage and food can manufacturing and, in engineering, fumes from welding to specialised processes such as electro-erosion machining. In all cases, there are a series of aspects to be considered.

LEV COSHH

With many dust extraction systems being designated as local exhaust ventilation (LEV) under HSE regulations for COSHH, the design and performance of the system must comply with the guidelines, which include:

Any dust extraction system designed to meet the requirements of COSHH will be fully compliant and our Spares and Service team will offer maintenance and COSHH survey on completion of the installation.

Hood Design - Capture

The effectiveness of any fume control system depends greatly on the concept of hood design. The more enclosed the fume source, or the closer the capture hood to the emission, the lower the airflow required, thus allowing a smaller system to be installed. In any system Delta Neu undertake all the calculations to assure you of effective capture or containment and a better designed system. A few key design points on the capture include:

Ductwork System

In the design of Ductwork systems, it is necessary to consider the dynamic laws of airflow, adequate conveying velocities, distribution and balance, abrasion and wear, energy running costs, sizes and materials available. The dynamic designs are applied in all cases however the construction and material requirements for fume applications are different to those in ventilation and the ductwork design must reflect this. The design of the ductwork system will have a significant bearing on the fan selection and motor size and the Uniline high efficiency fan range offers a broad spectrum to choose from.

Fume Filtration

There are broadly two ranges of fume filtration available; those for a fume which consists of sub-micron liquid droplets, like oil, and those where the fume is sub-micron particles of solid material like smoke from welding.

The Oilpack and Deltole range of filters are designed specifically for liquid fume applications where the fume coalesces on filter panels through Brownian motion and will collect and drain from the unit, often then being recycled. This equipment is typically used in the engineering and can making processes.

The Electrojet is designed for use on the highly toxic heavy metal fume produced in electro-erosion machining. This is a dry filtration technique whereby the fume is adsorbed by specialised powder coatings applied to efficient cartridge filters.

Air Recirculation

Many fume filtration applications lend themselves to re-circulation of the factory air after the filter process and making a significant contribution to heat recovery and energy management plans. The benefit of recirculation is two-fold. Firstly, the recycled air means that cold ambient air is not drawn in as make-up air due to the negative pressure created by the initial extraction. Secondly, the heat energy from the fan motor is added to the air as it is re-circulated.

Product Links

Uniline

Oilpack

Deltole

Electrojet

 

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