Quite often, the flue gas refers to the combustion exhaust gas produced at power plants.

It is more usual to see such techniques proposed for air capture, than for flue gas treatment.

The is removed after combustion of fossil fuels, but before the flue gas is expanded to atmospheric pressure.

See also Incineration Scrubber Flue gas emissions Flue gas stacks References External links Schematic process flow of FGD plant 5000 MW FGD Plant (includes a detailed process flow diagram) Alstom presentation to UN ECE on air pollution control (includes process flow diagram for dry, wet and seawater FGD) Flue Gas Treatment article including the removal of hydrogen chloride, sulfur trioxide, and other heavy metal particles such as mercury.

The flue gas consists of mainly carbon dioxide and water vapour, the latter of which is condensed through cooling.

Power plant processes based on oxyfuel combustion are sometimes referred to as zero emission cycles, because the stored is not a fraction removed from the flue gas stream (as in the cases of pre and post combustion capture) but the flue gas stream itself.

Technologies based on regenerative capture by amines for the removal of from flue gas have been deployed to provide high purity gas to the food industry and for enhanced oil recovery.

Normally, the heat from a flue powers an absorptive chiller .

The introduction of the flue gas mostly occurs at the bottom of the box to ensure that the carbon dioxide has enough time to interact with algae in the reactor fluid.

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The hydrogen could be converted into a liquid fuel by upgrading biofuels, for example, or it could be reacted with carbon dioxide from flue gas or otherwise processed to produce liquid fuels for use in transportation applications.

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Here, carbon dioxide is captured from flue gases at power stations or other large point sources.