Techno-economic and exergy analysis of polygeneration plant for power and DME production with the integration of chemical looping CO2/H2O splitting. (15th April 2019)

• Record Type: Journal Article
• Authors: Farooqui, Azharuddin; Di Tomaso, Felice; Bose, Archishman; Ferrero, Domenico; Llorca, Jordi; Santarelli, Massimo
• Is Part Of: Energy conversion and management. Volume 186(2019)
• Page Start: 200
• Page End: 219
• Publication Date: 2019-04-15
• Subjects: CO2/H2O splitting -- Chemical looping -- Polygeneration -- Oxyfuel combustion -- Dimethyl-ether (DME) -- Carbon capture; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2019.02.043
• Languages: English
• ISSNs: 0196-8904

Abstract

Highlights: Techno-economic of a polygeneration for power and DME plant is proposed. The integration resulted in a production of 103 MW and 2.15 kg/s of DME. The layout has an energetic and exergetic efficiency of 50% and 44%. The most expensive equipment resulted in the ASU which accounts for 23%. Plant produces power & DME at $50/MWh and $18/GJ at carbon tax of $80/tonne of CO2 . Abstract: In this paper, we present a novel polygeneration plant with carbon capture for the combined power and dimethyl ether (DME) production. The plant layout integrates a chemical looping CO2 /H2 O splitting (CL) unit producing syngas (CO and H2 ) for the DME synthesis using the exhaust gases of an oxyfuel power cycle. The primary power is generated by oxy-combustion of syngas generated by the reduction of the metal oxide in the reduction unit of the CL redox cycle with incoming natural gas. The oxyfuel power plant also generates steam for combined power production with two streams Rankine cycles. The aim of the present work is to assess the process on the basis of energy and exergetic efficiency and economic performance of the integrated CL unit for combined power and DME production. The integration proposed resulted in a production of 103 MWe and 185.6 ton/day (2.15 kg/s) of DME. The corresponding energy and exergetic efficiency was 50.2% and 45%, respectively. A discounted cash flow analysis was performed to evaluate the profitability of the process. With a carbon credit of $80/tonne, the plant would be able to meet the current electricity with carbon capture and DME prices of $50/MWh and $18/GJ respectively. The economic analysis provided information on the main economic drivers associated with the high capital investment in the process plant with individual sub-systems. The analysis highlighted the strong potential of integrating chemical looping CO2 /H2 O splitting for syngas production into polygeneration systems to increase the overall efficiency while reducing the cost of carbon capture.