Computation of plate columns for NOx absorption by a new stage‐to‐stage method

Authors:
  • KWKarl Wilhelm Wiegand
    Karl Wilhelm Wiegand
  • ESErich Scheibler
    Erich Scheibler
  • MTMichael Thiemann
    Michael Thiemann
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Abstract
A new stage‐to‐stage method has been developed for the calculation of NXx absorption columns. Each stage of the absorption column is simulated as a combination of a bubble column reactor (absorption) and an adiabatic plug for reactor (oxidation). The bubble column reactor is modelled as two single stirred tank reactors, one as a gas‐phase and one as a liquid‐phase reactor, both coupled by mass and heat transfer. In this hydrodynamic model, a dynamic approach is adopted, in which the gas‐phase transport of N2O4 is the limiting step for the absorption. A gas‐phasepseudo‐enhancement for factor for N2O4 is therefore introduced. The balance equations for a single phase of the bubble column are solved with a Newton‐Raphson algorithm. The entire column calculation is divided into a gas and a liquid side. On both sides, the stage‐to‐stage method is applied in such way that the overall calculation is performed as a loop process. The direction of the loop calculation follows that of the flow: gas‐side upwards and liquid‐side downwards.

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