Issues regarding foam-free variation at 2.0MPA
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Dear colleagues and experts: The design pressure in our company is 2.1 MPa, while the pressure during normal operation is around 1.9 MPa, for the desulfurization of tannin. Since starting operation, the regeneration efficiency has been poor: there is no foam formation, the tower resistance increases, forcing shutdowns for clogging removal (grid packing); the desulfurization liquid remains relatively clear, and the suspended sulfur level is not high. Components of the desulfurization solution: Na2CO3 0.74 g/l, NaHCO3 42.25 g/l, Na2SO4 13.5 g/l, NaSCN 0.11 g/l, Na2S2O3 7.90 g/l; pH 8.16, potential -78, gum content 1.12, total vanadium content 0.93, suspended sulfur content 119 mg/l. The deterioration of the desulfurization process is the biggest problem for our company, as it severely hinders production. I earnestly ask experienced colleagues for some guidance (hb30xc@163.com). Thank you!
There is no foam and the suspended sulfur level is not high because the rich liquid has not been regenerated. It’s unclear whether the hydrogen sulfide level at the exit of the desulfurization tower is high; if it is, then my judgment is correct, and it would be necessary to check the condition of the regeneration tank. 1. Is the regeneration temperature too low? It should be maintained above 35 degrees, with catalyst manufacturers recommending a range of 37–42 degrees as optimal. 1. Is the amount of recycled air too high? If it is, poor liquid-air contact can also cause this phenomenon; one can simply block the suction hole of the ejector to some extent.