CARBON DIOXIDE CAPTURE FROM FLUE GAS BY PRESSURE SWING ADSORPTION USING CARBON MOLECLAR SIEVE SORBENT

Chemical

Abstract

Emissions of carbon dioxide CO2 from power plant stations have direct effect on global climate change through increasing the average temperature which then threat the human life. Thus it is essential to reduce the CO2 emissions to the allowed level. Pressure swing adsorption (PSA) process is one of the efficient and economic processes for capturing the CO2 from flue gases. In the present study two columns 6-step PSA process packed with carbon molecular sieve (CMS) was used to study the effect of adsorption pressure, purge flow rate, and cycle time on the process performance (In term of CO2 purity). The results showed that the CO2 purity decreased in the product line and increased in the purge line with increases of the adsorption pressure. Increasing purge flow rate from 0.5 lit/min to 2 lit/min at the range of all cycle time and different adsorption pressures led to decrease in CO2 emissions. The CO2 purity decreased with increases of cycle time up to 80 second and then increased slightly at 100 second in spite of increasing of pressure to 4 bar. The CO2 purity was about 0.7% in the product line, and 38% in the purge out line.