Flue Gas Expansion Joints

Very simply, in a power plant, combustion exhaust gas that exits into the atmosphere through a duct is “flue gas.” The composition of the gas typically consists of nitrogen, carbon dioxide, water vapor and excess oxygen, along with percentage of pollutants, such as carbon monoxide, sulfur oxides and nitrogen oxides.

Flue gas is often treated with a series of chemical processes and scrubbers to remove pollutants. Electrostatic precipitators or fabric filters remove particulate matter, while flue-gas desulfurization captures sulfur dioxide. Nitrogen oxide is often treated by high temperature or catalytic reaction with ammonia or urea in order to produce nitrogen gas.

Flue gas expansion joints are typically non-metallic expansion joints designed to relieve stress caused by thermal expansion and vibration in handling systems. Well-designed flue duct expansion joint systems provide flexible connectors that absorb thermal growth and shock, while minimizing the impact of vibration.

Flue gas expansion joints fabricated by Zepco are designed to relieve the stresses caused by thermal expansion and vibration. Our expansion joints are designed to handle low pressure and extraordinary temperature ranges, up to 2000°F. Zepco-designed flue duct expansion joints are used for lightweight jobs, such as scrubbers, precipitators, bathhouses, and fans in air handling systems. They are available in various configurations and can be manufactured with almost no size restrictions.

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