Gas Filters and Pre-heaters FGWC

Construction and Function

The FGWC Gas Filter and Pre-heater are devices performing the functions of cellulose filters and pre-heaters at the same time. They are of the welded steel construction type. The cross-section shows how the filter and pre-heater work. Contaminated gas flows through the inlet into the body of the pre-heater. Due to the change of flow speed, coarse contaminants fall to the bottom of the gas section of the device. The remaining contaminants accumulate at the top, on the
outer surface of the filter insert while the gas flows through the device. From inside of the insert, the gas is lead through the pipe system immersed in a hot-water bath (where it is heated) and then into the outlet.

Safety Appliances

The heat exchangers have a nozzle on the body of the water-cooling jacket for connecting a safety fitting. In case of a crack in one of the gas-bearing heating tubes, the escaping gas can be led into the atmosphere via the bonnet or the safety valve. The standard connecting piece is made for a pressure of PN 16. It has a plain flange.

The water section is equipped with the RMG 790 Safety Shut-off Valve (SSV), which is adjusted to the max. pressure of the heating medium. This offers protection against the gas pressure in the boiler. Any gas that might escape is caught in the water section of the pre-heater.

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