基于高浓度MEA的CO₂化学吸收工艺优化

The improvement and optimization of the process are effective methods to lower the energy penalty of carbon capture technology. In this paper, the CO₂ chemical absorption process based on high concentration ethanolamine (MEA) absorbent was improved. Based on Aspen Plus process simulation software, combined with thermodynamic experimental data such as vapor-liquid equilibrium and heat capacity, the high concentration of MEA chemical absorption thermodynamics model was established, which is validated against experimental results from the pilot platform. The results indicate that the model could accurately predict the CO₂ absorption and stripping process. The important process parameters such as lean CO₂ loading, stripping pressure, terminal temperature difference of the rich-lean heat exchanger and CO₂ removal efficiency were optimized. Then, the novel coupling processes were investigated, which include absorber inter-cooling, rich-split and MVR processes. The results show that 40% MEA has great potential in reducing energy consumption. The joint optimization of the parameters of the traditional process and new process can effectively reduce regeneration energy. After comprehensive optimization, when the lean loading was 0.25mol CO₂/mol MEA and removal efficiency was 90%, the regeneration energy of 40% MEA is 2.61GJ/tCO₂, which is 34.75% lower than that of traditional process based on 30wt.%MEA(4.0GJ/tCO₂).