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Gas flow rate is the volume of gas passing a given point in a given time. Gas flow rate calculations are widely used in process engineering disciplines. Flow calculations in chimneys are often difficult. Because chimneys vary in diameter along their length. Basic calculations can be applied to any gas.
Gases are compressible and change in volume when pressurized, heated or cooled. Gas volume under a range of pressure and temperature conditions is not equivalent to the same gas under different conditions.
Gas flow rate is directly measured with different measuring devices, independent of pressure and temperature effects. The measurements relate to the density of the material, and the density of gases is highly dependent on pressure, temperature and, to a lesser extent, composition.
Flue gas is gas released into the air through a chimney, a pipe or duct for conveying exhaust gas from a furnace, stove, boiler or steam generator. The flue gas composition is different depending on what is burned, but generally consists of air, carbon dioxide, water vapor and nitrogen. It also contains a small amount of pollutants such as particulate matter, carbon monoxide, nitrogen oxides and sulfur oxides.
The velocity and flow rate of the flue gas flows in the chimneys mostly depend on the fuel composition, the combustion power and the burner air setting, the chimney diameter and the temperature of the gas entering the chimney.
