Issues with device calibration? ?
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Distillation uses a double-column process; during calibration the sulfur content in the refined gasoline is 9 PPm, so why is it 91 PPm in naphtha? ? ?
The stabilizer did not remove hydrogen sulfide completely to the top of the distillation tower. The natural hydrogen sulfide content in naphtha is high.
The total sulfur content in the front section is high; in the back section, most of the sulfur ends up in the upper part of the tower
Hydrogen sulfide was not completely removed in the gas tower, resulting in it entering the distillation tower and being vaporized to the top of the distillation tower. The stripper can appropriately reduce the tower pressure or increase the bottom temperature of the tower.
Hydrogen sulfide is an issue that can be addressed by increasing the amount of stripping steam at the bottom of the stripper; on the other hand, if there is an excess of thiol sulfur, it may be possible to reduce the hydrogen sulfide content in the recycled hydrogen or to increase the temperature of the post-refining bed.
It should be disulfide; the refined product, along with the caustic-washed naphtha, is sent to the stripping tower, and this component is likely difficult to remove
Run a lead acetate corrosion test; in my opinion, the hydrogen sulfide content in the naphtha is too high. The sulfur content in refined diesel is 9 ppm; there cannot be any organic sulfur in naphtha. A hydrogen stripping unit can be added to the hydrogen sulfide removal tower, or a naphtha desulfurization tank can be installed before the naphtha outlet.