Flue gas is usually composed of carbon dioxide (CO2) and water vapor as well as nitrogen and excess oxygen remaining from the intake combustion air.
It also contains a small percentage of pollutants such as particulate matter, carbon monoxide, nitrogen oxides and sulfur oxides.
The flue gas stacks are often quite tall, up to 400 meters (1300 feet) or more, so as to disperse the exhaust pollutants over a greater area and thereby reduce the concentration of the pollutants to the levels required by governmental environmental policy and environmental regulation.
Flexible bellow inserted at strategic positions in the flues and ducts.
Provided to take up the thermal movement of the flues and ducts
Insures that this movement is not transmitted to the casings of fans, precipitators, air heaters
Anchors are designed to transmit all loads and thrusts to the supporting steelwork or foundation.
Expansion joints can be either metallic or non-metallic fabrics
In case of more relative movements of ducts fabric expansion joints are used.
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