Wire
mesh packing has been extensively utilized in laboratory and
industry applications in rotating packed bed (RPB) because of the
high mass transfer performance and low cost. Conventional wire mesh
packings formed by the coiling meshes with constant porosity have
an increasing cross-sectional area along the radial direction, which
affects the fluid flow behavior and mass transfer performance. Herein,
wire mesh packings with controllable cross-sectional area were designed
and rapidly fabricated using the three-dimensional (3D) printing technology.
Gas–liquid mass transfer efficiencies of wire mesh packings
with various structures and cross-sectional areas were evaluated.
The gas–liquid effective interfacial area (a
e) and liquid-side volumetric mass transfer coefficient
(k
L
a
e) of
the concentric wire mesh packing with constant cross-sectional area
were, respectively, 25.5 and 14.7% higher than those of the coiled
one with increasing cross-sectional area. The correlations for prediction
of a
e and k
L
a
e, considering previous and current
data, were respectively established with acceptable deviations.
The marine exhaust gas containing SO2 leads to serious impacts on human health and marine environments. Due to the strict emission standard of marine exhaust gas and the limited space of ships, desulphurization process intensification is urgent. Herein, a cross‐flow rotating packed bed (CF‐RPB) with a compact size was developed toward desulphurization of marine exhaust gas. According to the emission standards of different sea areas, the characteristics of simulated open seawater desulphurization (OSD) and closed alkali desulphurization (CAD) were systematically evaluated. The respective correlations for Kya of OSD and CAD were proposed to predict the height of CF‐RPB. The desulphurization efficiencies of 86% in the OSD and 97% in the CAD were achieved in a three‐stage CF‐RPB, satisfying the emission standard. Compared with the traditional spray tower, the CF‐RPB has a higher mass transfer coefficient with a smaller volume, which has great potential for desulphurization of marine exhaust gas.
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