Exergy Analysis of Gas Switching Chemical Looping IGCC Plants
Integrated gasification combined cycles (IGCC) are promising power production systems from solid fuels due to their high efficiency and good environmental performance. Chemical looping combustion (CLC) is an effective route to reduce the energy penalty associated with CO<sub>2</sub> capt...
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MDPI AG
2020-01-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/13/3/544 |
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| author | Carlos Arnaiz del Pozo Ángel Jiménez Álvaro Jan Hendrik Cloete Schalk Cloete Shahriar Amini |
| author_facet | Carlos Arnaiz del Pozo Ángel Jiménez Álvaro Jan Hendrik Cloete Schalk Cloete Shahriar Amini |
| author_sort | Carlos Arnaiz del Pozo |
| collection | DOAJ |
| description | Integrated gasification combined cycles (IGCC) are promising power production systems from solid fuels due to their high efficiency and good environmental performance. Chemical looping combustion (CLC) is an effective route to reduce the energy penalty associated with CO<sub>2</sub> capture. This concept comprises a metal oxygen carrier circulated between a reduction reactor, where syngas is combusted, and an oxidation reactor, where O<sub>2</sub> is withdrawn from an air stream. Parallel to CLC, oxygen carriers that are capable of releasing free O<sub>2</sub> in the reduction reactor, i.e., chemical looping oxygen production (CLOP), have been developed. This offers interesting integration opportunities in IGCC plants, replacing energy demanding air separation units (ASU) with CLOP. Gas switching (GS) reactor cluster technology consists of a set of reactors operating in reduction and oxidation stages alternatively, providing an averaged constant flow rate to the gas turbine and a CO<sub>2</sub> stream readily available for purification and compression, and avoiding the transport of solids across reactors, which facilitates the scale up of this technology at pressurized conditions. In this work, exergy analyses of a gas switching combustion (GSC) IGCC plant and a GSOP−GSC IGCC plant are performed and consistently benchmarked against an unabated IGCC and a precombustion CO<sub>2</sub> capture IGCC plant. Through the exergy analysis methodology, an accurate assessment of the irreversible loss distribution in the different power plant sections from a second-law perspective is provided, and new improvement pathways to utilize the exergy contained in the GSC reduction gases outlet are identified. |
| first_indexed | 2024-04-11T13:25:54Z |
| format | Article |
| id | doaj.art-a3516aa7fe3f4460934e3413afa50e05 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T13:25:54Z |
| publishDate | 2020-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-a3516aa7fe3f4460934e3413afa50e052022-12-22T04:22:05ZengMDPI AGEnergies1996-10732020-01-0113354410.3390/en13030544en13030544Exergy Analysis of Gas Switching Chemical Looping IGCC PlantsCarlos Arnaiz del Pozo0Ángel Jiménez Álvaro1Jan Hendrik Cloete2Schalk Cloete3Shahriar Amini4Universidad Politécnica de Madrid, Calle Ramiro de Maeztu 7, 28040 Madrid, SpainUniversidad Politécnica de Madrid, Calle Ramiro de Maeztu 7, 28040 Madrid, SpainSINTEF Industry, Richard Birkelands vei 2B, 7034 Trondheim, NorwaySINTEF Industry, Richard Birkelands vei 2B, 7034 Trondheim, NorwaySINTEF Industry, Richard Birkelands vei 2B, 7034 Trondheim, NorwayIntegrated gasification combined cycles (IGCC) are promising power production systems from solid fuels due to their high efficiency and good environmental performance. Chemical looping combustion (CLC) is an effective route to reduce the energy penalty associated with CO<sub>2</sub> capture. This concept comprises a metal oxygen carrier circulated between a reduction reactor, where syngas is combusted, and an oxidation reactor, where O<sub>2</sub> is withdrawn from an air stream. Parallel to CLC, oxygen carriers that are capable of releasing free O<sub>2</sub> in the reduction reactor, i.e., chemical looping oxygen production (CLOP), have been developed. This offers interesting integration opportunities in IGCC plants, replacing energy demanding air separation units (ASU) with CLOP. Gas switching (GS) reactor cluster technology consists of a set of reactors operating in reduction and oxidation stages alternatively, providing an averaged constant flow rate to the gas turbine and a CO<sub>2</sub> stream readily available for purification and compression, and avoiding the transport of solids across reactors, which facilitates the scale up of this technology at pressurized conditions. In this work, exergy analyses of a gas switching combustion (GSC) IGCC plant and a GSOP−GSC IGCC plant are performed and consistently benchmarked against an unabated IGCC and a precombustion CO<sub>2</sub> capture IGCC plant. Through the exergy analysis methodology, an accurate assessment of the irreversible loss distribution in the different power plant sections from a second-law perspective is provided, and new improvement pathways to utilize the exergy contained in the GSC reduction gases outlet are identified.https://www.mdpi.com/1996-1073/13/3/544gas switching combustiongas switching oxygen productionexergyigccco<sub>2</sub> captureefficiency |
| spellingShingle | Carlos Arnaiz del Pozo Ángel Jiménez Álvaro Jan Hendrik Cloete Schalk Cloete Shahriar Amini Exergy Analysis of Gas Switching Chemical Looping IGCC Plants Energies gas switching combustion gas switching oxygen production exergy igcc co<sub>2</sub> capture efficiency |
| title | Exergy Analysis of Gas Switching Chemical Looping IGCC Plants |
| title_full | Exergy Analysis of Gas Switching Chemical Looping IGCC Plants |
| title_fullStr | Exergy Analysis of Gas Switching Chemical Looping IGCC Plants |
| title_full_unstemmed | Exergy Analysis of Gas Switching Chemical Looping IGCC Plants |
| title_short | Exergy Analysis of Gas Switching Chemical Looping IGCC Plants |
| title_sort | exergy analysis of gas switching chemical looping igcc plants |
| topic | gas switching combustion gas switching oxygen production exergy igcc co<sub>2</sub> capture efficiency |
| url | https://www.mdpi.com/1996-1073/13/3/544 |
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