LCS-FY2019-PP-07
Cost Evaluation of Direct Air Capture (DAC) Process of Carbon Dioxide
Summary
DAC (Direct Air Capture) is necessary in a zero-carbon society. For example, when carbon dioxide in boiler exhaust gas is captured by a conventional carbon dioxide capture technique such as an amine absorption process, it is difficult to achieve a capture rate of 100%, and low-concentration carbon dioxide is discharged into the atmosphere. Therefore, DAC that directly collects the emitted carbon dioxide from the atmosphere is required.
In this report, we evaluated DAC technology using the KOH-CaCO3 developed by Carbon 'Eng'g.
The DAC cost (domestic basis) is 35.4 JPY/kg-CO2. The fixed cost for equipment is 20.6 JPY/kg-CO2, accounting for 58% of the total cost. The variable cost is 14.7 JPY/kg, of which CH4 contributes 90%. In order to reduce the cost of DAC, it is necessary to review the Air Contactor, which accounts for about 50% of the equipment cost. In this study, we examined the packing materials recommended by Carbon Engineering Ltd. (0.05 JPY/y/m3). In the case of the packing materials used for amine absorption process for maintaining performance, the cost of the Air contactor equipment will be four to five times higher, and the DAC cost will be 78 JPY/ kg-CO2.
The development of new DAC technology by Japan is of great significance even if the CO2 storage area is located abroad. We propose to promote the DAC related technology development as a national project.
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Related Proposal Papers
- Survey on the Carbon Capture and Storage process (Vol. 2): The CO2 Capture Cost by the Membrane Separation and the CCS Cost of the Storage and the Injection
- Survey on the Carbon Capture and Storage process: Comparison of the chemical absorption process with the physical absorption process for CO2 capture.