Discussion on MDEA decarbonization technology
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The LNG decarbonization process uses the MDEA process, with the solution being changed every two weeks. Recently, the absorption tower and regeneration tower have frequently experienced liquid carryover and uncontrolled liquid levels, resulting in an inability to increase the load. Look for colleagues in the industry to exchange ideas on technical issues.
In the amine solution circulation system, lean amine and rich amine filters are installed; these filters are connected via bypass lines, and it is recommended that they handle around 20% of the total circulation volume. If there is severe liquid entrainment in the absorption tower, it indicates that the tower is foaming, due to excessive impurities in the amine solution and high surface tension. Adding an appropriate amount of defoamer can resolve this issue. More specific details can help facilitate communication.
Why isn’t the Benfield solution used in decarboxylation processes? The decarboxylation effect of potassium bicarbonate is better than that of MDEA; after all, potassium bicarbonate belongs to the inorganic category, and its handling in terms of solution preparation and surface tension control is much more stable than that of MDEA
Do I need to change the solution every half month? There’s probably an issue with the selection or ratio of the solutions
I’m not quite sure – with MDEA decarboxylation, is the absorption tower where the decarboxylation and adsorption take place, and is the regeneration tower where the amine solution is regenerated? Which stage involves liquid? If it is an absorption tower, it might be experiencing flooding; it is possible to check whether the ratio of the amine solution is appropriate, the quality of the depleted liquid after regeneration, and whether the mechanical filters and activated carbon filters are functioning properly, in order to ensure that the amine solution remains clean. I also have the same question: what is your LNG processing capacity, and why does the amine solution need to be replaced every half month? Also, what is the inlet temperature of the amine solution in the absorption tower, and what is the temperature of the natural gas entering the tower? The high temperature sensitivity of MDEA decarboxylation should also be taken into account. .