Modelling And Experimental Study Of MEA-based CO₂ Capture Process

Over the last few decades,there has been an increasing interest in climate change and global warming.Due to climate change and depletion of fossil fuels,the researchers from all over the world have turned their attention to overcome global warming and climate change.There are several ways to reduce the CO₂emission.One of the most promising technology for this purpose is CCS technology.In this dissertation,work is done with experiment and simulation study.The objective of current work is to check the effect of different parameters on energy consumption,capture rate and reboiler duty,and to check out the feasibility of solar technology with CCS technology.The purpose of simulation is to compare the results of experiment and simulation.In the experimental section,the methods of improving the energy efficiency of chemical absorption method are discussed from several aspects.The simulations were performed in Aspen Plus an inbuilt template,“ELECNRTL Rate＿based＿MEA-Model”.The simulation is carried out to check the effect of solvent flow-rate and desorber pressure on regeneration energy,carbon capturing and loading capacity compared with the experimental data under steady state conditions.The experimental results shows that,parameters like CO₂concentration,capture rate,absorption temperature mainly affect the latent heat and sensible heat of the cycle,which means reducing latent-heat and sensible-heat,is the key to improving the energy performance.Based on the parameter analysis,it is found that the maximum energy consumption is 2.37 GJ/t CO₂and the second-law efficiency limit is close to30%,when the desorption temperature is in the range of 110-120℃.The energy performance analysis of actual system shows that the liquid-gas ratio is an important factor that affects the cycle performance.By optimizing the liquid-gas ratio.the optimal energy consumption can be obtained at the L/G ratio of 4L/m³,which is about4.4 GJ/t CO₂.The capture system is integrated with a solar collector to test the feasibility and performance of solar assisted capture technology,the trough collector can provide 40-50%amount of the reboiler duty to the system.