Flat-bag filter with horizontally installed flat-bag filter elements

The filter housing is divided into crude gas and clean gas chamber by means of perforated plates. The flat-bag filter elements, each consisting of flat-bag and support cage, are precisely fixed in the housing. They are fitted in the holes of the perforated plate, secured without the use of screws and provide a perfect seal against dust leaks. The crude gas flow through the textile filter material is from outside to inside and the particles are retained on the outside.

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Flat-bag filter with vertically installed flat-bag filter elements

The filter housing is divided into crude gas and clean gas chamber by means of perforated plates. The flat-bag filter elements, each consisting of flat-bag and support cage, are mounted form the clean gas side. The flat-bag elements are precisely fitted in the housing. They are fixed in the holes of the perforated plate, secured without the use of screws and provide a perfect seal against dust leaks. The crude gas flow through the textile filter material is from outside to inside and the particles are retained on the outside.

The advantages of a flat-bag filter with horizontally installed filter elements can only partially be used in case of vertical installation of filter elements.

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Compressed air - on line - cleaning

The clean gas chamber is provided with vertically installed, easy to remove compressed air injectors, arranged in front of each bag row. Compressed air and clean gas as secondary gas are injected sequentially into two adjacent bag rows by means of injectors, designed in accordance with aerodynamic principles. The bag rows are cleaned in pairs by a brief pulse of jet air, injected into the bags contrary to the filtration flow, thus removing the particle cake from the fabric filter.

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Compartmentalised compressed air - off line - cleaning

The fundamental design of this cleaning system is demonstrated in the illustration, exemplary shown by means of a flat-bag filter with vertically installed flat-bags.

The clean gas chamber is divided into several chambers. Each chamber is connected with the clean gas collective channel and can be isolated. At the beginning of the cleaning process in one chamber the corresponding isolation damper on the clean gas side will be closed. The flat-bags are cleaned during interrupted filtration process by means of compressed air.

On request, the complete crude gas area of the filter housing can also be divided into chambers, thus offering the possibility to isolate separate chambers for inspection and/or repair whilst the other chambers are still available for the filtration process. In principle this will also be possible in case of use of a compressed air – on line – cleaning system.

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Travelling compressed air - off line - cleaning

The cleaning of the flat-bag rows takes place sequentially in steps by means of a cleaning device, travelling within the clean gas chamber and provided with compressed air feeding and injector tubes. The cleaning device covers three vertical filter bag rows, the middle of them being cleaned with a brief, about 0.5 sec., pulse of compressed air and clean gas as secondary gas. A lip seal along the carriage travel serves as reliable sealing, proved in continuous operation.

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Travelling medium pressure - off line - cleaning

The cleaning of the flat-bag rows takes place sequentially in steps by means of a cleaning device, travelling within the clean gas chamber. The cleaning air is injected into one flat-bag row by means of a medium pressure fan, whilst the two adjacent flat-bag rows to the row being cleaned are not charged by the crude gas during the cleaning process. A lip seal along the carriage travel serves as reliable sealing, proved in continuous operation.

This cleaning system does not require any compressed air.

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