THE COMPARATIVE ANALYSIS OF EFFICIENT WAYS TO EXTRACT CARBON DIOXIDE FROM THE PROCESS GASES
DOI:
https://doi.org/10.18198/j.ind.gases.2014.0741Keywords:
The carbon dioxide, Biogas, Flue gas, Synthesis gas, Generating gas, Monoethanolamine (MEA), Methyldiethanolamine (MDEA), Absorption, Desorption, Heat, OptimizationAbstract
Carbon dioxide is contained in the various process gases. In some cases it is extracted for the gases purification, for example, to increase caloric value of the remaining gas or to obtain a separate product. To remove the CO2 from the process gases such as flue and producer gases, synthesis gas and biogas it is advisable to use a chemical absorption method using the aqueous solutions of the following amines: monoethanolamine (MEA) and methyldiethanolamine (MDEA). The optimal composition of the aqueous solution of MDEA and MEA (40 % MDEA, 10 % MEA, 50 % H2O) was found where in a single-flow absorption circuit the minimal heat consumption for CO2 extraction from the given process gases was achieved. The analysis of the obtained results showed that using the optimal composition the heat consumption for regeneration of the solution of the sorbents saturated with carbon dioxide decreased by 1,5-3,5 times, and the consumption of the solution and electricity to drive circulation pumps was reduced by 15-35 % compared to the solution of just with MEA. The calculations were carried out with the use of the software systems of technological modeling HYSYS and GasCondOil.
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