Predicting the ultimate potential of natural gas SOFC power cycles with CO2 capture – Part B: Applications

Campanari, Stefano; Mastropasqua, Leonardo; Gazzani, Matteo; Chiesa, Paolo; Romano, Matteo Carmelo

doi:10.1016/j.jpowsour.2016.05.134

Cited by 51 publications

(12 citation statements)

References 33 publications

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“…The GT component polytropic efficiencies are the same as the ones employed in the benchmark plants to allow a consistent comparison. The reduction gases outlet is further cooled down in a condenser and water is knocked out, prior to a CO2 purification unit (CO2 CPU) consisting of a two-flash vessel cryogenic system similar to the one described in [28,29]. This purification step is needed because, due to the mixing occurring during the valve switch in the GSC reactors, the CO2 purity resulting after water removal is below the 96% mol.…”

Section: Gsc Igcc Plantmentioning

confidence: 99%

“…The fluidized bed gasifier was modeled assuming a syngas outlet temperature of 900 °C and fixing the ratio of the lower heating value (LHV) of methane in the syngas and coal LHV input to 11.3%, analogously to [10]. The carbon conversion achieved in the Winkler gasifier is lower than in the Shell The reduction gases outlet is further cooled down in a condenser and water is knocked out, prior to a CO 2 purification unit (CO 2 CPU) consisting of a two-flash vessel cryogenic system similar to the one described in [28,29]. This purification step is needed because, due to the mixing occurring during the valve switch in the GSC reactors, the CO 2 purity resulting after water removal is below the 96% mol.…”

Section: Gsop-gsc Igccmentioning

confidence: 99%

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Exergy Analysis of Gas Switching Chemical Looping IGCC Plants

et al. 2020

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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 CO2 capture. This concept comprises a metal oxygen carrier circulated between a reduction reactor, where syngas is combusted, and an oxidation reactor, where O2 is withdrawn from an air stream. Parallel to CLC, oxygen carriers that are capable of releasing free O2 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 CO2 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 CO2 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.

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Section: Gsc Igcc Plantmentioning

confidence: 99%

Section: Gsop-gsc Igccmentioning

confidence: 99%

Exergy Analysis of Gas Switching Chemical Looping IGCC Plants

et al. 2020

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“…However, components' lifetime, manufacturing costs and overall performance must still be improved in order to foster a quicker and widespread market introduction. solid oxide fuel cells (SOFCs) are one of the most outstanding representatives of this family of technology and are being studied for applications ranging from small‐scale combined heat and power (CHP) , , data centers and large scale power generation with and without carbon capture and storage (CCS) , .…”

Section: Introductionmentioning

confidence: 99%

Development of a Multiscale SOFC Model and Application to Axially‐Graded Electrode Design

2019

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A multiscale model is built to understand how microscale characteristics and the thermo‐chemical and electrochemical phenomena, occurring in the electrode and electrolyte assembly, may affect the overall performance of a solid oxide fuel cell (SOFC) stack. This study presents the integration of two‐dimensional finite volume models: a 1D microscale model and a 1D (or 2D) macroscale (channel/cell) model. The new tool is calibrated against the experimental data of a short‐stack via a numerical procedure aiming at the minimisation of the mean square deviation of the model from the measured data. Subsequently, the distribution of electrochemical active thickness in a state‐of‐the‐art solid oxide cell channel is calculated; the result is limited between 3% and 7% of the electrode thickness. An axially graded electrode is studied by changing the particle radii in order to locally control the triple phase boundary length distribution along the cell channel. The performances of a four‐section graded electrode is estimated in comparison to a reference non‐graded electrode. The average current density increases by approximately 6% in the short‐stack. If such a graded design was introduced into a state‐of‐the‐art cogeneration system, the extrapolation of these results suggests that a power output increase up to 13.5% is attainable.

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“…To reach the purity levels required, a CO2 purification unit (CO2 CPU) is employed. The simplest configuration which results in the lowest capital expenditure and auxiliary power demand consist of a two flash vessel configuration as the one depicted in Figure 84, which has been applied previously to Oxy-combustion and fuel-cell based power plants [113,114], but using expanders in the gaseous streams to deliver more refrigeration to the cold boxes. A triethylene glycol drying step which eliminates H2O simulated as a component splitter is also included at a pressure between 15-25 bar for all cases (prior to the cryogenic exchangers).…”

Section: Co2 Cryogenic Purification Unit (Co2 Cpu)mentioning

confidence: 99%

The potential of gas switching chemical looping technology to eliminate the energy penalty of CO2 capture

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Predicting the ultimate potential of natural gas SOFC power cycles with CO2 capture – Part B: Applications

Cited by 51 publications

References 33 publications

Exergy Analysis of Gas Switching Chemical Looping IGCC Plants

Exergy Analysis of Gas Switching Chemical Looping IGCC Plants

Development of a Multiscale SOFC Model and Application to Axially‐Graded Electrode Design

The potential of gas switching chemical looping technology to eliminate the energy penalty of CO2 capture

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