Integration of chemical looping oxygen production and chemical looping combustion in integrated gasification combined cycles

Giuffrida, Antonio; Romano, Matteo Carmelo; Chiesa, Paolo; Pishahang, Mehdi; Cloete, Schalk

doi:10.1016/j.fuel.2018.02.048

Cited by 27 publications

(50 citation statements)

References 31 publications

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“…This strategy limits the temperature variation over the cycle, allowing longer cycle times with a fixed maximum temperature and thereby limiting the undesired mixing between reactor steps (seen in Figure 1a after switching the inlet streams at x-axis values of 0 and 1), as discussed in previous publications [5,21]. In the GSOP reactors (Figure 1b), an oxygen carrier with oxygen uncoupling properties is used [10]. In the reduction step (0-1 on the x-axis), the oxygen carrier is reduced by syngas in exothermic reactions, heating the reactor while simultaneously releasing oxygen, which is utilized in the gasifier.…”

Section: Reactor Simulationsmentioning

confidence: 99%

“…For the stationary process modeling simulations, the Peng Robinson equation of state was used to determine the thermodynamic properties of syngas/air streams, while ASME steam tables were used for the property estimations of steam in the bottoming cycle. In the GSOP reactors (Figure 1b), an oxygen carrier with oxygen uncoupling properties is used [10]. In the reduction step (0-1 on the x-axis), the oxygen carrier is reduced by syngas in exothermic reactions, heating the reactor while simultaneously releasing oxygen, which is utilized in the gasifier.…”

Section: Power Plantsmentioning

confidence: 99%

“…Uniform temperature can be achieved throughout the reactor length, and the good mixing properties prevent fuel dilution (to avoid deposition on the carrier), but also lead to an undesired mixing of gases when switching between the oxidation and reduction stages, reducing the CO 2 purity of the reduction outlet and lowering the capture ratio. The performance of the GSOP reactors operating in fluidized mode is improved with respect to the packed bed configuration, increasing the concentration difference of O 2 between the reactor outlet streams relative to the values obtained in [10]. The trade-off between a more efficient generation of the oxidant stream and the lower CO 2 capture ratio (resulting of the fluidized bed clusters) will be evaluated in the present analysis for the GSOP-GSC IGCC plant.…”

Section: Introductionmentioning

confidence: 97%

“…This concept employs an oxygen carrier that is capable of releasing free oxygen in the reduction stage that can be effectively used for oxy-combustion or as gasification agent. In the work [10], an integration of CLOP and CLC employing packed bed (PB) gas switching reactors in an IGCC plant is presented, revealing an efficiency increase of approximately 2.5% relative to the plant employing only CLC. A subsequent techno-economic assessment [11] showed that PB-CLC power plants clearly outperform the precombustion CO 2 capture IGCC benchmark, but revealed a trade-off between the benefit of adding the CLOP reactors and the added complexity and increase in cost of the gasification section.…”

Section: Introductionmentioning

confidence: 99%

“…In this work, a gas switching combustion (GSC) IGCC and GSOP-GSC IGCC plant are modeled, employing bubbling fluidized beds as gas switching reactors in both clusters, while previous studies focused on plants employing packed bed reactors [10,14]. The fluidization mode allows an easier operation (activation of material and continuous replenishment) and avoids material-related challenges (strength and reactivity).…”

Section: Introductionmentioning

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: Reactor Simulationsmentioning

confidence: 99%

Section: Power Plantsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Exergy Analysis of Gas Switching Chemical Looping IGCC Plants

et al. 2020

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Flexible strategies for carbon‐negative syngas and biochar poly‐generation via a novel chemical looping approach

Liu,

Sun,

Wang

et al. 2024

AIChE Journal

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This work proposed a pyrolysis chemical looping reforming‐two stage regeneration (PCLR‐TR) process with carbon‐negative syngas and biochar poly‐generation，aimed at overcoming challenges in chemical looping gasification. The process effectively separates pyrolysis and reforming, circumventing slow solid–solid reactions and enabling the flexible adjustment of the H2/CO ratio. The two‐stage regeneration ensures improved synchronization of reaction rates across different reactors. The results indicate that manipulation of process parameters allows for flexible adjustment of the H2/CO ratio in syngas (ranging from 1.02 to 3.83). The introduction of CO2 feed in the first stage regeneration reactor reduces the oxygen carrier exothermic intensity in the second stage regeneration reactor by 58%. Optimization results suggest that the generated syngas is compatible with diverse downstream applications, exhibiting a maximum CO2 negative emission of 1.85 kg/kg syngas. The PCLR‐TR system offers a versatile and environmentally friendly solution for the energy and chemical industries.

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Technoeconomic Analysis of a Fixed Bed System for Single/Two–Stage Chemical Looping Combustion

et al. 2021

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Chemical looping combustion (CLC) is a promising carbon capture technology allowing integration with high-efficiency Brayton cycles for energy production and yielding a concentrated CO 2 stream without requiring air separation units. Recently, dynamically operated fixed bed reactors have been proposed and investigated for CLC. This study deals with the technoeconomic assessment of a CLC process performed in packed beds. Following a previously published work on the topic, two different configurations are considered: one relying on a single oxygen carrier (Cu/CuO based) and the other on two in-series oxygen carriers (Cu/CuO based first, Ni/NiO based later). For both configurations, relevant process schemes are devised to obtain continuous power generation. Despite slightly larger capital costs, two-stage CLC performs better in terms of efficiency, levelized cost of electricity, and avoided CO 2 costs. Fuel price and high-temperature valves costs are identified as the main variables influencing the economic performance. The use of two in-parallel packed bed reactors (2.0 m length, 0.7 m internal diameter) enables a power output of 386 kW e , a net electric efficiency of 37.2%, a levelized cost of electricity of 91 € MWh e À1 , and avoided CO 2 costs of 55 € ton CO2À1 with respect to a reference pulverized coal power plant.

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Integration of chemical looping oxygen production and chemical looping combustion in integrated gasification combined cycles

Cited by 27 publications

References 31 publications

Exergy Analysis of Gas Switching Chemical Looping IGCC Plants

Exergy Analysis of Gas Switching Chemical Looping IGCC Plants

Flexible strategies for carbon‐negative syngas and biochar poly‐generation via a novel chemical looping approach

Technoeconomic Analysis of a Fixed Bed System for Single/Two–Stage Chemical Looping Combustion

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