PCC pilot plant studies with aqueous potassium glycinate (cas 15743-44-9)

Add time:09/07/2019    Source:sciencedirect.com

The present research work discusses the suitability of aqueous potassium glycinate (KGly) in a PCC-pilot plant. Reference is made to measurement results with aqueous sodium glycinate (NaGly). The use of real power plant flue gas and the well-conceived dimensions of the test facility enable industry-related conditions for full-scale applications.Although 40 wt% KGly has faster kinetics in unloaded state, no enhancements in plant operation could be achieved in comparison to 40 wt% NaGly. Just like with NaGly, the difficult feasibility of KGly regeneration leads to slow CO2 absorption rates, resulting in a huge energy demand >5.5GJ/tCO2. A far lower energy demand of 3.68GJ/tCO2 was measured for 30 wt% MEA. The required solvent flow rate for reaching the optimal operating point is high (L/G-ratio = 9 l/m3). The pilot plant was operated with a massive reduced flue gas flow (40% of the dimensioning) in order to prevent instable operation and to reach the desired CO2 separation efficiency of 90%. During a prolonged shutdown, excessive carbonate was formed in the desorber column, resulting in a further reduction of the flue gas flow rate. Measurements of the ammonia content of the treated flue gas exhibit that the solvent degrades enormously.

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