How is the volume at the actual temperature of the flue gas calculated?
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This post was last edited by yggswl on 2015-7-9 08:29. Since flue gas is at high temperatures, standard conditions hardly apply. For calculating the heat recovered from waste heat, the actual volume and temperature are required. I would like to determine the volume of flue gas under standard conditions when it is at actual temperatures and pressures – does flue gas also obey the formula PV/T = constant? At 20 degrees Celsius, the proportions are CO2: 5.44%, O2: 6.25%, H2O: 17.25%, and N2: 71.06%; these values refer to volume percentages. I would like to know the volume proportions at 300 degrees Celsius
The key point is: if there is water vapor present, is it then unknown whether this formula can be used?
Water vapor can also be considered an ideal gas at normal pressure.
Since the pressure of the flue gas is close to atmospheric pressure, the ideal gas law can be applied, but the error will be around 10% higher! If stricter requirements are imposed, one can refer to the equations of state for real gases in chemical thermodynamics, such as the van der Waals equation or the virial equation, for calculations! !