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Stricter requirements to reduce powder emission - now down to 10 mg powder/Nm3 of process air - and the potential for a higher yield by collecting more of the powder led to the development of the GEA Niro SANICIP™ CIP-able bag filter.
GEA Niro SANICIP™ CIP-able bag filter
The GEA Niro SANICIP™ bag filter is a reverse jet type filter, designed in accordance with the strictest sanitary requirements given by the leading international agencies in EU and USA.
The exhaust air containing some powder particles is passed through the GEA Niro SANICIP™ filter. It consists of a cylindrical bag housing with spiral shaped or radial air inlet, clean air plenum on top, and a conical bottom with fluidized powder discharge. During operation the product collected on the outside of the filter material is blown off by a compressed air jet stream from the inside of each bag by means of a specially designed reverse jet air nozzle (patented) positioned above the bag.
This results in a very even discharge of powder. The frequency and duration of the cleaning sequence can be adjusted to suit actual running conditions. The result is a low pressure drop across the filter, i.e. reduced energy consumption and noise emission. Another special feature in the SANICIP™ bag filter is that the bags are wet-cleaned from the inside towards the dirty outside (patented) by means of a clean water spray, reducing the overall amount of CIP water considerably.
All the fines discharged from the bag filter are returned to the process. This means that no powder is lost as waste, but sold as first-class product. Retrofits of old plants equipped with cyclones and traditional bag filters or wet scrubbers can now be done by replacing the old exhaust system by a GEA Niro SANICIP™ bag filter.
Full utilization of energy recuberation is now possible if a heat recovery system is installed after the SANICIP™ bagfilter. As there are practically no powder particles left in the exhaust air the heat recovery system can be designed so that the air with the moisted - on vapor form - can be cooled to below the condensation temperature and all the entrained energy can be reserved and reutilized.
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