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Computation of plate columns for NO x absorption by a new stage‐to‐stage method
Author(s) -
Wiegand Karl Wilhelm,
Scheibler Erich,
Thiemann Michael
Publication year - 1990
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.270130139
Subject(s) - absorption (acoustics) , mass transfer , bubble column reactor , loop (graph theory) , mechanics , adiabatic process , bubble , stage (stratigraphy) , column (typography) , chemistry , flow (mathematics) , plate column , continuous stirred tank reactor , heat transfer , phase (matter) , thermodynamics , materials science , chromatography , physics , gas bubble , mechanical engineering , mathematics , engineering , paleontology , combinatorics , connection (principal bundle) , biology , organic chemistry , composite material
A new stage‐to‐stage method has been developed for the calculation of NX x 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 N 2 O 4 is the limiting step for the absorption. A gas‐phasepseudo‐enhancement for factor for N 2 O 4 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.