What is flue gas?

3 Answers

  • Anonymous
    2 months ago

    It's more of an engineering concept than a chemical one.  You'd likely get more answers my moving this question.

  • Anonymous
    2 months ago

    Technically, it's any gas that is carried away from a chemical reaction by a chimney or smokestack (which are sometimes referred to as "flues").  In common usage, it typically refers to the products of any sort of combustion - as opposed to steam, which is also often exhausted via a stack because of its temperature alone.

    These days, the word "flue" is most often heard in discussions of the exhaust of air and water heating units for homes.

  • 2 months ago


    Flue gas is the gas exiting to the atmosphere via a flue, which is a pipe or channel for conveying exhaust gases from a fireplace, oven, furnace, boiler or steam generator. Quite often, the flue gas refers to the combustion exhaust gas produced at power plants. Its composition depends on what is being burned, but it will usually consist of mostly nitrogen (typically more than two-thirds) derived from the combustion of air, carbon dioxide (CO₂), and water vapor as well as excess oxygen (also derived from the combustion air). It further contains a small percentage of a number of pollutants, such as particulate matter (like soot), carbon monoxide, nitrogen oxides, and sulfur oxides.

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