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Ceramic or hot air filters are in all likelihood most commonly connected with ceramic water filtration processes. But in terms of hot gas ceramic filtration this operates in a markedly different manner. Standard ceramic filters are utilised in many industries and factories that handle harmful gases and in many cases require the release of damaging gases into the planet's atmosphere. Ceramic filtration is used to absorb some of these harmful elements before they are released into the air. These hot air filters are designed to function in temperatures approaching 1000 degrees and are available in various filter sizes - in order that they to cater for the various gas flume sizes. These are high temperature pieces of equipment as they make sure that the removal of particles from the air or gases is continuous. As well as this, such filters can also contain sorbent powders which can act as a dry scrubber. Purpose built vessels are implemented for the filters, in order to meet to a wide range of industrial specifications. This hot gas filter process is utilised with catalytic gas treatment, dry scrubbing, incineration, pyrolosis and gasification applications and processes. These need the process gas to be cooled and/or purified before being then being fully filtered. All filtration processes are carried out in chemical processes, due to how effective it is. Some of the primary reasons for taking out solids at high temperatures include the fact that the gas involved is already at a higher temperature and is clean. In addition to this the gas can contain condensable solids or liquids which need to remain in the vapour phase and once the solids have accumulated. There is a possibility that this may alter their properties if the temperature goes down. The utilisation of ceramic material in hot air filters is very suitable due to its durable nature and ability to withstand extremely high temperatures; it is very uncommon for them get damaged and are not affected by sparks or by other particles. Ceramic fibres are less expensive and are said to perform better than other rigid filtration methods. These are similarly good for thermal shock resistance and are resistant to acid gasses which can raise the risk of erosion. In situations where solids have not been efficiently taken out, the outer layer of the ceramic material might corrode and often end up with it being delaminated. With these factors come expensive maintenance and repairs; but it is worth noting that these occurrences are not very common.
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