LCS-FY2015-PP-08
Survey on the Carbon Capture and Storage process: Comparison of the chemical absorption process with the physical absorption process for CO2 capture.
Summary
We analyzed the chemical (i.e., amine) and the physical absorption processes in the method of capturing CO2 from the fossil fuel power plant exhaust gas. In this report, analysis is limited up to liquefaction process of captured CO2 after the desulfurization process, so that the costs of storage, transportation and injection in the Carbon Capture and Storage (CCS) are excluded.
The present analysis shows that CO2 capture cost becomes 3.9¥/kg in the physical absorption process and 4.1¥/kg in the amine absorption process, respectively. The physical absorption process is cheaper than the amine absorption process. However, the CO2 capture cost is about 4¥/kg in the both cases and it is almost the same. When the amount of the captured CO2 per unit electric power generation is assumed to be 0.7kg/kWh, the cost of about 2.8¥/kWh is piled on the power generation cost within the range of the present analysis. This result suggests that the future competition with the cost of other renewable energy is severe under the present situation.
The storage, transportation and injection cost in the CCS will be evaluated in the next step, together with the comparison with the membrane separation case.