After desulfurization, the hydrogen sulfide level is normal, but it’s much higher after ammonium sulfate treatment!
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Our facility has coke oven gas and gas generated through gas production processes. After desulfurization, the hydrogen sulfide levels in both types of gas are within normal ranges. However, after treatment with ammonium sulfate, the hydrogen sulfide level in the gas generated through gas production processes increases significantly, reaching up to 70 ppm. Everyone believes that this is due to liquid present in that gas, but there is also liquid in the coke oven gas – so why isn’t the increase in hydrogen sulfide levels as great in that case? Could someone help take a look at what’s going on here and suggest how to fix it? ? ? ? ? ?
It is quite simple to rule out the possibility that high test results are caused by gas mist entrainment: take gas samples from a distance, and fully open the sampling tube before taking the sample in order to exhaust any residual liquid medium within it. If the values are still high, then it means the actual concentration of gas is indeed high; if the measured concentration is normal, then it is the mist entrainment that has caused the deviation in the test results.
The sample results we obtained at the gas holder inlet are not much different from these, but there is a significant difference between crude gas and gas produced through gas generation – why is that?