Is your process gas analysis accurate?
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May I ask, is the analysis of the composition of the sulfur process gas and exhaust gases at your facility accurate? Which one is the least reliable? Is the analysis of sulfur exhaust accurate? Is there a big difference compared to online measurements? Can SO2 be analyzed? Isn’t it very small? Here is the key specific question: What is the typical level of H2S/COS in exhaust gas purification? What analysis methods and what analysis criteria? How to improve analysis accuracy? In my case, the SO2 level in the sulfur-containing exhaust gases is essentially 0, and the H2S level in the purified exhaust gases is also basically 0 (as determined by chromatography). When using colorimetric tubes, the value is below 20 mg/m3; this difference is huge – with such low levels, my exhaust gases would already meet the standards. What about COS? The laboratory said it’s not possible to analyze it; chromatography is required for that, but even chromatography can’t do it. . . Then, ask what methods are available to measure total sulfur in exhaust gases
This issue hits a sore spot in sulfur recovery units.
Now I want to try foreign-made amine solutions; the evaluation criterion is the absorption rate of H2S from exhaust gases. Isn’t that creating problems for oneself?:’( It’s quite troublesome. . .
After water removal in the quench tower, the analyses at the inlet and outlet of the absorption tower are still quite reliable. Previously, the inlet to the quench tower was not allowed to be used because of the high water content, which caused dissolution of the sample after it condensed.
If sampling is done using a sampling bag, the process gas is cooled after sampling, and sulfur dioxide dissolves in water, making it impossible to detect. In the purified gas after exhaust gas absorption, the levels of hydrogen sulfide and COS are very low, making them difficult to detect. Our method involves taking a sample of the process gas for a quick inspection, analyzing the total sulfur content in the purified gas, and then using a portable detector to measure hydrogen sulfide – which is a relatively reliable approach.