SO2 and NO emitted from marine ships have
seriously
polluted the regional environment. However, there is a lack of high-efficiency,
small-size, and cost-effective technology with which these pollutants
could be purified. Here, a gas cyclone–liquid jet absorption
separator (GLAS) combined with NaClO solution was developed to remove
SO2 and NO simultaneously. The high-speed gas that rotates
in the GLAS forms a high-gravity field and vortex flow, and SO2 and NO were removed efficiently in a small GLAS. The effect
of key operating parameters was well studied through the experiment,
and the total mass transfer coefficient (K
G
a) was calculated. It was found that the removal
efficiency increased with the absorbent flow rate and concentration,
while it decreased with the gas flow rate and the initial SO2 and NO concentrations. Under the experimental conditions, the maximum
removal efficiency for SO2 and NO was 99% and 93%, and
the maximum K
G
a was 0.0559
and 0.0357 kmol·m–3·kPa–1·s–1, respectively, which were 10 times higher
than that of traditional devices. Semiempirical equations were also
developed to predict the mass transfer performance of desulfurization
and denitrification by GLAS. The study indicates that GLAS combined
with NaClO solution has great potential applications for marine ships.
The slow‐strain‐rate test (SSRT) is the most commonly used method for evaluating pipeline steel in service environments. However, to accurately assess the sensitivity of steel to hydrogen, it is necessary to investigate the effect of different strain rates, taking into account microstructure‐influenced hydrogen migration. Herein, a hot‐rolled X70 pipeline steel sheet is investigated by a SSRT at different strain rates with and without synchronous hydrogen charging. The influence of the pearlite content and different strain rates on the hydrogen‐assisted crack propagation and hydrogen diffusion in pipeline steels is discussed. Using scanning electron microscopy, electron backscatter diffraction, transmission electron microscopy, and hydrogen microprinting, the hydrogen atoms are observed to be easily segregated at the ferrite/pearlite (F/P) interface without external stress. Under loading, a higher strain rate results in lower hydrogen permeation content in steel, penetrating into pearlite and interacting with its internal vacancies, leading to transgranular fracture initiating from pearlite. At a low strain rate, the F/P interface is more vulnerable to hydrogen degradation, leading to intergranular crack mode along the interface and increased tendency to form secondary cracks. Therefore, strain rate–induced crack initiation and propagation characteristics should be considered during the SSRT.
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