MDEA-PZ carbon capture process simulation and optimization
A model system is established using Aspen Plus process simulation software for a 166 752 m3/h(dry basis)raw gas decarbonization process using methyldiethanolamine(MDEA)and piperazine(PZ)as composite absorption solvents.The simulation results indicate that the theoretical number of plates,packing height and tower diameter in the MDEA-PZ solvent decarbonization process should be optimized while ensuring absorption and regeneration effects and avoiding tower flooding.The height of the absorption tower packing has a large design margin,and when the number of effective plates exceeds 16,which can meet the mass transfer requirements.As the number of trays in the lower section of the regeneration tower increases,the amount of carbon dioxide regeneration also increases,indicating that the longer the contact gas extraction time,the more conducive it is to the regeneration of carbon dioxide.When the number of plates in the lower section of the regeneration tower is 25,which can meet the requirements.If the number of plates in the upper section of the regeneration tower is greater than 15,which can meet the requirements.
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