Treatment of desulfurization off-gases from liquefied gas refining
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There are several issues related to the treatment of exhaust gases from the refining and desulfurization processes in liquefied gas systems; we welcome experts to share their insights: 1. Exhaust gas emissions: Theoretically, the current practice of discharging these gases through chimneys is not compliant, as these sulfur-containing compounds cannot be removed through alkaline treatment and therefore cannot be detected – their concentration is merely reduced due to dilution. Now some companies are proposing zero emissions, but the investment cost is very high. 2. Light hydrocarbon recovery: It is very difficult to recover them, and the key lies in liquefaction; I wonder if anyone has any effective solutions. 3. Alkali slag: Alkali slag is somewhat inevitable; it’s just a matter of degree. There are too many problems with membrane treatment, and the results are not satisfactory. Does anyone have any good solutions?
One approach involves oxygen injection and exhaust gas recycling, but it requires high investment. The best option for dealing with exhaust gases is to discharge them into incinerators that use waste acid or sulfuric acid; discharging them into catalytic regenerators is also an option, but safety measures need to be added
Is there no sulfur? If it’s larger, use sulfuric acid
Our exhaust gases are now sent to the CO incinerator in the catalytic unit for combustion; the alkaline sludge can be used in the acidic water stripping unit, which helps to reduce the ammonia nitrogen content in the wastewater discharged
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