① Oxygen Content: Low oxygen content is required to ensure safe production. High oxygen content increases side reactions. Generally, the oxygen content in the gas should be less than 0.5%, the lower the better.
② Carbon Dioxide: Carbon dioxide content is generally stable. If the content is too high (e.g., in shift gas desulfurization), it will consume more sodium carbonate, lowering the solution pH, which is detrimental to hydrogen sulfide absorption and negatively impacts regeneration. Its content should be measured as one of the bases for adjusting total alkalinity.
③ Cyanide: Semi-water gas and coke oven gas contain hydrogen cyanide, which reacts with alkaline solution to form sodium cyanide and sodium hydrosulfide, consuming alkali. Therefore, its content should be measured to adjust alkalinity and predict raw material consumption.
④ Hydrogen Sulfide: The hydrogen sulfide content varies greatly among different raw material gases. The production load depends on both the gas volume and the hydrogen sulfide content. Its content range should be accurately measured to adjust solution composition, regeneration, and operating conditions. ⑤ Organic sulfur: Generally, wet desulfurization can only remove some organic sulfur, but it will be converted into hydrogen sulfide in the subsequent process, which is also not conducive to production. Measuring the organic sulfur content can provide real reference data for the desulfurization of sulfides in the subsequent process.
