Prospects for cost-effective post-combustion CO_2 capture from industrial CHPs

摘要

Industrial Combined Heat and Power plants (CHPs) are often operated at partial load conditions. If CO_2 is captured from a CHP, additional energy requirements can be fully or partly met by increasing the load. Load increase improves plant efficiency and, consequently, part of the additional energy consumption would be offset. If this advantage is large enough, industrial CHPs may become an attractive option for CO_2 capture and storage CCS. We therefore investigated the techno-economic performance ofpost-combustion CO_2 capture from small-to-medium-scale (50-200 MWe maximum electrical capacity) industrial Natural Gas Combined Cycle- (NGCC-) CHPs in comparison with large-scale (400 MWe) NGCCs in the short term (2010) and the mid-term future (2020-2025). The analyzed system encompasses NGCC, CO_2 capture, compression, and branch CO_2 pipeline. The technical results showed that CO_2 capture energy requirement for industrial NGCC-CHPs is significantly lower than that for 400 MWe NGCCs: up to 16% in the short term and up to 12% in the midterm future. The economic results showed that at low heat-to-power ratio operations, CO_2 capture from industrial NGCC-CHPs at 100 MWe in the short term (41-44 EUR/tCO_2 avoided) and 200 MWe in the midterm future (33-36 EUR/tCO_2 avoided) may compete with 400 MWe NGCCs (46-50 EUR/tCO_2 avoided short term, 30-35 EUR/tCO_2 avoided mid-term).