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What are the process steps that the Natural Gas passes through from the underground well to the LNG ship's tanks as liquid ❓
The Raw feed gas from the underground well is sent to the liquefaction plant 💧 :
1️⃣ Condensate removal - It is first stripped of condensates.
2️⃣ Acid gas and Mercury removal - It is then followed by the removal of acides gases Carbon dioxide CO² and Hydrogen sulphide H²S. Carbon dioxide must be removed as it freezes ❄ at a temperature above the atmospheric boiling point of LNG 👉-60°C and the toxic compound hydrogen sulphide is removed as it causes 👉 atmospheric pollution when being burnt 🔥 is a fuel.
3️⃣ Dehydration - Acid gas removal saturates the gas stream with water vapour 💭 and this is then removed by the dehydration unit.
4️⃣ Fractionation - The gas then passes to a fractionating unit where the 👉 NGLs are removed and further split into Propane and Butane.
5️⃣ Liquefaction - Finally, the main gas flow, now mostly Methane, is liquefied 💧 into the end product Liquefied Natural Gas LNG and stored in tanks 🏢 ready to be loaded into LNG ships.
Source : McGuire & White
