Rate-Based Modeling Of Carbon Dioxide Absorption Process In Aqueous Amine Solutions Is Built Within Aspen Plus

In recent years, the average global temperature rising, repeatedly refresh record. With population and economic scale increasing, air pollution and climate warming increasingly serious, not only destroyed the ecosystem, but also had seriously affected the quality of people's lives and health. China is still in the phase of rapid development of industrialization and urbanization, Chinese energy consumption and greenhouse gas emissions rise greatly. China will face a big challenge in the future, therefore, the enough research and test is needed to control and deal with greenhouse gases. Carbon capture and storage (CCS) technology is a promising way to control global warming, and most of the most commonly used amine solution is MEA (CO2) aqueous solution.In this paper, a rate-based model of CO2 absorption process in aqueous ME A/ME A-AMP solution was set up using the Aspen Plus software. Finally the rate-based model was applied in the treatment of flue gas from boiler. The main results are listed as follow:The results show that the absorption rate of CO2 was calculated by the nonequilibrium stage model was 74.44%, simulated values and experimental values error within ±5%; and the tower's temperature distribution has a good agreement with the experimental results; at the same time, from the distribution of vapor-liquid critical group composition, liquid hold up, pressure drop, and HETP along the absorber, obtained the non equilibrium stage model can truly reproduce the packed column gas-liquid flow, mass transfer and reaction processes, more suitable for simulation in chemical absorption process.We compared 30 wt.% MEA,30 wt.% AMP with 18 wt.% MEA+12 wt.%AMP in several parameters, The simulation results show that the non equilibrium stage model has a good agreement with the experimental values, CO2 absorption rate of simulation error is within ±5%, absorbent joined the AMP compared with MEA absorbent, the interfacial area and liquid holdup increased, the pressure drop increased, HETP decreased;Random packing Raschig rings (Raschig) and BERL and structured packing Mellapak 250Y and CY was calculated in MEA-AMP absorbent. The simulation results show that the structured packing CY with larger void volume and specific surface area, has a high liquid hold up and surface area, and the pressure drop is small, HETP is low, the mass transfer efficiency is the highest, the CO2 absorption rate can reach 99.998%.The rate-based model of MEA absorbent is applied in the treatment of flue gas from boiler. And the energy analysis results show when the CO2 capture rate reached 76.84%, lean liquid load is 0.26 molCO2/VmolMEA, the unit consumption of decarburization is 4.82×103 kWh/tonCO2, the energy consumption per unit of decarburization is 17.3 GJ/tonCO2, after energy optimization and modified, the energy consumption per unit of decarburization is 14.37 GJ/tonCO2.