Techno-economic evaluations of post-combustion CO 2 capture from sub- and super-critical circulated fluidised bed combustion (CFBC) power plants

摘要

Highlights？Techno-economic assessments of sub- and super-critical CFBC power plants with CCS.？Post-combustion CO2capture by gas-liquid absorption and gas-solid adsorption.？In-depth techno-economic assessment applied for CFBC power plants with CCS.？Calcium looping cycle delivers lower energy and cost penalties for carbon capture.AbstractThe heat and power generation sector is facing fundamental changes for transition to a low carbon scenario due to significant environmental constraints. This paper is evaluating from techno-economic point of view the integration of post-combustion CO2capture technologies into coal-based CFBC power plants operated in sub- and super-critical steam conditions. Two post-combustion CO2capture technologies were assessed: a chemical gas-liquid absorption using alkanolamines (Methyl-DiEthanol-Amine - MDEA) and a gas-solid adsorption using calcium-based sorbent (Calcium Looping - CaL). The analysis evaluates how chemical gas-liquid absorption/gas-solid adsorption influence the techno-economic performances of CFBC power plants. As benchmark cases used to quantify the energy and cost penalties for CO2capture, the correspondent sub- and super-critical CFBC plants without CO2capture were considered. As the results show, the CaL concepts exhibits better net electrical efficiency (35% vs. 32%), higher carbon capture rate (97% vs. 90%) and improved economic indicators (e.g. 1860vs. 2552?/kW net power as specific capital investment, 34vs. 41.6?/MWh as O&M costs, 66vs. 84?/MWh as cost of electricity) compared to the MDEA cases (all these values being reported for the super-critical CFBC designs).]]>