연소 후 CO2 포집기술이 적용된 500 MWe 석탄화력발전소의 경제성평가를 수행하고 CO2 저감비용 (Cost of CO2 avoided)을 산출하였다. 본 연구에서 고려된 CO2 포집기술은 이미 상업적으로 적용이 가능하고, 기존의 화력발전에 적용이 용이한 화학 흡수법을 기초로 하였으며 투자비용 산출을 위해 IEA Greenhouse Gas R&D Programme에서 제시하는 데이터를 활용하였다. 또한 CO2 포집공정 중 가장 많은 발전효율 저하를 가져오는 재열기(리보일러)에 투입되는 열에너지(재생에너지)를 대상으로 민감도분석을 수행하고 각각의 경우에서의 CO2 저감비용을 산출하였다. 분석결과 CO2 포집공정에 적용될 흡수제로 MEA(모노에탄올아민)가 사용되고 재생탑에서 필요한 재생에너지가 3.31 GJ/tonCO2인 경우 발전효율은 CO2 포집설비 설치 전의 41.0에서 31.6%로 9.4% 감소하고 이때의 CO2 저감비용은 43.3 $/tonCO2 로 산출되었다. 그러나, 흡수제 재생에너지를 변수로 한 민감도분석에서 재생에너지가 2.0 GJ/tonCO2로 낮아질 경우 CO2 저감비용은 36.7 $/tonCO2까지 낮아질 것으로 분석되었다.

In this study, performance and economic analysis of 500 MWe coal-fired power plant with CO2 capture process was performed. For this purpose, chemical absorption method which is commercially available and most suitable for thermal power plant was studied and a criteria for technical and economic assessment of power plants suggested by IEA Greenhouse Gas R&D Programme was used. And we performed the sensitivity analysis focused on regeneration energy which exceed half of the total capture energy. Based on MEA(Monoethanoleamine) as a main chemical solvent and 3.31 GJ/tonCO2 regeneration energy in the stripper, net power efficiency was reduced from 41.0% (no capture) to 31.6%(with capture) and the cost of CO2 avoided was estimated 43.3 $/tonCO2. And in case of 2.0 GJ/tonCO2 regeneration energy, the cost of CO2 avoided was calculated as 36.7 $/tonCO2.

CO2 Capture Chemical Absorption Flue Gas Monoethanolamine Economic Evaluation

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