Sulfide hydrogen levels have risen suddenly; what could be the cause?
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The hydrogen sulfide level in the gas after the desulfurization tower rose straight from 200 to 600. By reducing the gas flow by 50% and lowering the solution flow rate, the hydrogen sulfide content in the gas downstream of the tower did not decrease; instead, it increased sharply to around 1500. It is initially suspected that there is a problem with the tower itself. I urgently need suggestions or methods from fellow sailors.
It’s likely the effect of gas flow deviation; reducing the gas flow as a temporary measure is correct, but lowering the liquid flow rate is not appropriate. Check whether there have been any changes in the composition of your liquid
By reducing the solution flow rate, it naturally increases, and the cleaning effect deteriorates.
First, analyze the sulfur content in the gas inlet and the composition of the desulfurization liquid, and adjust the amounts of liquid and steam. If this does not yield any results, then it is a problem with the equipment.
It’s about adjusting the solution flow rate; in all cases, the operation is carried out with a reduced level of hydrogen sulfide
There is no change in the hydrogen sulfide content in the gas in front of the tower; the desulfurization efficiency remains relatively constant. Issues with the quality of the desulfurization solution only cause a gradual decline in this efficiency, while sudden increases are likely related to an increase in the sulfur content of the coal used. The resistance due to flow deviation issues with equipment, etc., should be reflected
First, it is necessary to check whether the initial H2S concentration has suddenly increased (due to the sulfur content in the raw coal). Second, it is important to verify whether the pH value of the desulfurization solution is too low; hydrogen sulfide solutions are weakly acidic, and when the pH value of the desulfurization solution drops, the H2S dissolved in it may escape, resulting in an increase in the H2S concentration in the gas.
Is the sulfur in gas import elemental sulfur? The components of the desulfurization solution are only thiocyanosulfide
Check the H2S content in the gas inlet to assess the efficiency of the desulfurization tower; if everything has been checked, then the equipment itself should be inspected.
It was a device malfunction; it has been resolved now. Thank you everyone