MDEA-PZ脱碳工艺模拟与优化

MDEA-PZ carbon capture process simulation and optimization

使用Aspen Plus流程模拟软件,为一套采用甲基二乙醇胺(MDEA)和哌嗪(PZ)作为复合吸收溶剂的166752 m^(3)/h(干基)原料气脱碳流程建立了模型系统。模拟结果表明,应在保证吸收和再生效果以及塔不发生液泛的前提下,优选MDEA-PZ溶剂法脱碳工艺流程中塔设备的理论板数、填料高度以及塔直径。吸收塔填料高度具有较大设计裕量,有效板数大于16块时即可满足传质要求;随着再生塔下段塔板数的增加,CO_(2)的再生量随之升高,表明接触气提时间越长,越有利于CO_(2)的再生,再生塔下段塔板数为25块时可以满足要求;再生塔上段塔板数大于15块即可满足要求。

A model system is established using Aspen Plus process simulation software for a 166752 m^(3)/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.