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Economic Evaluation of CO2 Separation Technologies in Chinese Refineries

With the clear emission reduction target of China for 2020, the refining industry as a large emission source inevitably plays a significant role. The paper confirmed and assessed three commercially available CO2 separation technologies for refineries, vacuum swing adsorption (VSA), monoethanolamine (MEA) and membrane absorption (MA). The economic results indicate that the capital cost of constructing a CO2 capture unit is 35.996 M¥, 34.418 M¥, 37.502 M¥, respectively. And the corresponding cost of avoided is 379.8 ¥/tCO2, 249.6 ¥/tCO2 and 376.5 ¥/tCO2. Sensitivity analyses are also performed examining the effect of CO2 price on economic feasibility, as well as improvements of regeneration energy demand and CO2 capture system on the CO2 avoided cost. The regeneration energy demand impacts the avoided cost significantly, whereas CO2 capture system demonstrates insensitivity. Though the CO2 avoided cost for MEA case is highest, MEA has been commercially the most available processe so far for existing refineries. However, MA will be the most promising alternative to chemical absorption in the future, provided that membrane performance is further improved. In addition, the CO2 avoided cost of VSA is close to that of MEA, but other economic indicators are optimal due to a large amount of H2 recovered. Currently, without any incentive and a major technological break-through, CO2 capture from the source of hydrogen production units at Chinese refineries is the most attractive opportunity.