Dust Cartridge Filters and Media Development
R&B Industrial supply a wide range of industrial and commercial air and dust cartridge filters.
We have extensive in-depth knowledge of most of the major dust extractor manufacturers. We can advise you on the best filter option(s) to complement your processes and dust collector(s).
- DCE, UMA
- Dustcheck Mahle
- Torit, Sintermatic, downflow
Adapting to Application Requirements
Dust control is rarely the main consideration for the designers of process engineering plant. However, multiple design considerations need to be taken into account when designing filter equipment. Air volume, filter area, ambient conditions, cleaning cycle, flow management and element geometry are all crucial. Product characteristics such as particle size, bulk density, bonding, agglomeration and moisture content also play an important part in the design process.
Therefore, not only is it necessary to choose the correct media for the product being handled, it is also important to select the correct cartridge format for the application. To this end, considerable time has been put into developing a range of cartridge formats to suit a wide range of applications.
Dust Cartridge Filter Media Development
The choice of filter media is crucial. In the early days of cartridge filtration the relatively high cost of polyester cartridges meant that the most widely used media was a cellulose paper similar to that used in automotive filtration. While this offered good levels of efficiency, it was not a particularly resilient media and was also unsuitable for use with damp or sticky products. A lot has changed since those early days. Modern media manufacturing and cartridge production processes have meant that polyester based medias are now a very cost effective solution offering high strength, excellent efficiency and superior product release characteristics.
Over the last decade there have been continuous advances in the development of standard and also more exotic cartridge medias. For finer or more cohesive products, PTFE membranes can be applied to the base polyester offering much greater efficiencies (100% down to 0.5 µm) and even better product release characteristics.
Reduced Maintenance and Improved Cleaning
Maintenance on conventional bag type filters has always been a lengthy, dirty and intricate procedure. There are also health and safety issues to be considered – particularly if the products being handled are of a toxic nature. Cartridge technology has revolutionised this operation offering much faster, cleaner and simpler solutions – not least is the consideration that for a given filter area, the number of filter cartridges is far less than the equivalent bag type solution.
There are a number of different cleaning methods which have been developed; mechanical shake, reverse air and reverse jet.
The vast majority of cartridge type solutions utilise reverse jet technology. The technique is relatively simple; a jet of high-pressure air is injected into the filter element against the direction of process airflow. This allows particulate which has built up on the surface of the filter media to be dislodged, allowing it to fall back into the process (or in the case of a dust collector into a collection bin).
Cartridge filters, utilise ‘surface’ filtration which does not allow particulate to penetrate the media and relies on a slight build up of dust on the media surface to act as a ‘pre-filter’. The media is held rigid within the confines of the cartridge and the reverse jet air is then used to simply ‘flush’ the media to dislodge particulate from the surface. Due to the much reduced core volume of a cartridge filter compared with an equivalent bag element, the effect of a given quantity of cleaning air is much greater, leading to improved cleaning efficiency.
Multi-hole cleaning jets are also used to very good effect on a number of cartridge filters to ensure efficient distribution of cleaning air over the whole surface of the filter element. It is the above parameters which make it possible for cartridge filters to be capable of cleaning up to 20m² of filter area from a single cleaning air source thereby leading to reduced cleaning valve requirements.