Is the desulfurization rate of transformed gas tannin lower than that of semi-water gas tannin? ?
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During the desulfurization of tannin gum: a gas flow rate of 0.5~0.8 m/s is generally used for the desulfurization of semi-water gas, while 0.15~0.25 m/s is typically used for that of shift gas. I came across a statement on a forum; why is the gas flow rate lower in the latter case compared to the former? What is the reason behind this? ?
Is it because the latter requires a higher level of desulfurization precision and greater efficiency?
1# The HaiChuan Wind system is likely designed to improve the stability of the semi-decompression process. Semi-decompression generally takes place before compression, at a pressure of around 20 kPa, while full-decompression occurs after compression, at a pressure close to 2.0 MPa. If a very high gas flow rate is required, the diameter of the full-decompression tower will have to be very small, which makes the actual operation unstable； A low gas velocity may prevent the gas from holding back the liquid, resulting in deflection and affecting the desulfurization efficiency.
Desulfurization towers generally use packed towers； The gas velocity in a packed tower is generally determined by multiplying the liquid-overflow gas velocity in an empty tower by a factor less than 1 ； As can be seen from the general correlation diagram for packed columns, the higher the gas phase density, the lower the void space velocity in the column ； The semi-water gas desulfurization tower operates at near atmospheric pressure, while the pressure in the variable-desulfurization tower is usually above 1 Mpa; thus, the pressure there is much higher than that in the semi-desulfurization tower, and the gas density is also much higher ； Therefore, the gas velocity in a fully stripped column is lower than that in a semi-stripped column.