Flue gas filters

The G&G Ceramic JET-B flue gas filters are designed for dedusting flue gases generated by the combustion of solid fuels in combustion sources. Thanks to their construction, the filter units are used for dedusting biomass combustion boilers.

The basic characteristic of filtration devices is the resistance to hot particles and residues of unburned fuel which occur in the flue gases during the combustion of biomass. The flue gases entering the filter unit are directed to the lower part of the filter device by means of an internal partition so that the housing of the filter unit is evenly heated. The flue gas passes through the filter medium upwards into the clean filter chamber and then through the outlet opening to the flue gas fan.

Ash collection takes place in the standard design into integrated ash tanks which the boiler operator periodically empties. For boilers in continuous operation, the filter units are to be equipped with an automatic ash removal system. At lower installation heights the removal of dust is solved by means of a movable bottom of the filter and then by a screw conveyor to the dustbin.

The filtration device is thermally insulated over the entire casing and is equipped with an electric heating cable for tempering the filter housing and preventing condensation of flue gases at the moment of starting or stopping the boiler at a low flue gas temperature.

The filtration equipment does not have to be equipped with a pyramidal dust hopper due to the lower installation dimensions for the possibility of installation directly into the boiler room.

The flue gas fan placing

The flue gas fan is always located downstream the flue gas filter in the path of the filtered gas. The fan control is controlled depending on the vacuum in the flue before connecting to the boiler. The flue gas fan then uses a frequency converter to maintain constant vacuum conditions so that the boiler function is not affected.

The flue gas filter is always equipped with a flue gas bypass so that it is possible to shut down the filter device during inspections and service inspections and to carry out inspections or repairs without the need to shut down the boiler.

The ceramic filter media

The filter elements “candles” are refractory ceramic rods which have a high temperature resistance up to 1200 ° C. The filter elements are arranged vertically inside the filter housing with the outlet of the filtered flue gases in the upper part of the filter. The ash is separated on the outer surface of the ceramic candles. The regeneration of the filter candles takes place by flushing with pulses of compressed air cyclically during the operation of the filter unit.

Ash collection takes place in the standard design into integrated ash tanks which the boiler operator periodically empties. For boilers in continuous operation, the filter units are to be equipped with an automatic ash removal system. At lower installation heights the removal of dust is solved by means of a movable bottom of the filter and then by a screw conveyor to the dustbin.