Study On The Absorption And Desorption Characteristics Of CO₂from The Flue Gas Captured By The Organic Amine Solution

Chemical absorption was chosen in the paper. And absorption conditions, mixedamine solution and new technology of regeneration were studied.1. The sequence of absorption conditions was investigated using MEA assolution though the orthogonal experiment. The experimental results show that whatthe sequence is temperature> CO2volume fractions> MEA mass fractions. In thisstudy, the best absorption condition are40℃,15%CO2and20%MEA. According tothe data of simulation and calculation for the diffusion rate of CO2, the absorption rateof CO2into MEA aqueous solution is controlled by gas film. The magnitude ofphysical absorption of CO2in the static absorption is10-5mol/10ml through thegas-liquid equilibrium simulation. The solubility coefficient and chemical equilibriumconstant is also be calculated.2. Adding PZ to MEA or SG could improve the solution absorption andregeneration performances under certain experimental conditions. And the latter isbetter than the former.3. Elevated the temperature can increase the desorption rate of CO2. But thehigher the temperature, the greater the experimental error.4. A study of carbon dioxide absorption and regeneration performances wascarried out using ternary mixed amine solution. The results show that: the absorptionrate of MEA-PZ solution> absorption rate of MEA-SG-PZ> absorption rate of PZ.The MEA: SG: PZ=0.4:0.4:0.2mixed amine solution works best on absorptionquantity(0.00108mol/10ml), which is greater than the others. The results ofdesorption rate and the absorption rate were on the contrary.5. Findly, the new technology of vacuum regeneration is studied. Theexperimental results show that the performance of vacuum regeneration turns betterwith longer regeneration time and lower regeneration pressure. Then, thedecompression regeneration performances of complex solution was studied under theregeneration pressure10kPa, regeneration time30min, water bath temperature30℃.The results show that along with the increase of the proportion of PZ in mixed aminesolution, the desorption rate of binary mixed amine solution decreased, while thedesorption rate of ternary mixed amine solution increased.