The sodium-based dry desulfurization process is a promising
technology
for flue gas desulfurization. However, its industrial application
still heavily relies on empirical experience. In this study, a three-dimensional
numerical model was established for an industrial sodium-based dry
desulfurization process. Numerical simulations were conducted to investigate
the effects of the desulfurizer particle mass flux, particle size,
and internal structures of the reactor on desulfurization efficiency.
The results show that SO2 is mainly removed through the
reaction path in which the desulfurizer of NaHCO3 (sodium
bicarbonate) thermally decomposes to Na2CO3 and
then reacts with SO2. Increasing the mass flux of the desulfurizer
and decreasing the particle size can significantly improve the desulfurization
efficiency. However, the excessive addition of the desulfurizer of
NaHCO3 leads to waste and, thus, increases the desulfurization
cost. Among the internal structures, the swirl-type structure achieves
the maximum improvement in desulfurization efficiency but also results
in a significant increase in pressure drop. In contrast, the diffuser-type
structure has a low pressure drop while providing an acceptable enhancement
in desulfurization efficiency. The research results provide effective
references for the design and optimization of the sodium-based dry
desulfurization process for flue gas treatment.
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