이산화탄소 포집 수송 저장 누출의 전과정평가 연구

This study was set the scenario that carbon dioxide of 3 million ton per year emitted by coal-fired power plant was captured and compressed to a level of 95%, and stored underground. The composition of the impurities(5%) in the capture materials was assumed including the general air pollutant, such as CH₄, N₂O, NOx and Hg, etc, emitted by coal-fired power plant. Features of this study is not the purity of carbon dioxide, examinate the magnitude of the environment impact on the 1∼5% of impurities. In particular, the environmental impact of these impurities that appear high is examined.

Through the CCS, net avoidance effect of global warming was 3.88E+09 kg CO₂-eq/kg.

Weighting result due to leakage in the case of 1% leakage was 3.03E+05 Pt in the water system and 5.77E+03 Pt in the soil system. And Weighting result due to leakage in the case of 5% of leakage was 2.88E+04 Pt in the water system and 1.51E+06 Pt in the soil system. The cause of the environmental impact of the soil system is higher than the water system appeared by mercury(Hg) and weighting factor of mercury was larger caused in the soil system. According to the weighting results of the environmental impact, excepting mercury, 5% of leakage was 5.42E+03 Pt in the soil system. In this case, the avoidance effect was 3.38E+05 Pt. That is, excluding mercury, it was analyzed that CCS can reduce the environmental load.

In the future, there is a need to further study the presence or absence of including an environmental impact assessment quantification of impurities and collecting materials for safe CCS. Also, it must quantify the environment effect of lower pH due to carbon dioxide and be a lot of research on the prediction of changes in the ecosystem.