Packed Bed Chemical Looping Platform: Design and Operation of 30kWth Pilot Unit

Hua, Xiuning; Zhu, Jin; Wu, Xiaoshuang; Zhou, Xia; Deng, Zhicong; Wang, Wei

doi:10.1016/j.proenv.2016.02.011

Cited by 6 publications

(8 citation statements)

References 17 publications

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“…To realize the commercial applications of packed bed CLWS, the scale-up of the packed bed is vital. In our previous study [30], we found that the experimental results from the scaled-up packed bed were similar to those from the bench scale packed bed. The solid conversion of the reduction step in the pilot-scale packed bed was 0.250 (the maximum solid conversion at 800 °C was 0.299, as observed in Fig.…”

Section: Application Of the Reaction Fronts Movement Modelsupporting

confidence: 54%

“…Hydrogen with an average purity of 74.6% (N2 free basis) was obtained when the 67.0% of CO was converted. In addition, a moving bed or a packed bed is another configuration for CLWS [29][30][31][32]. Cho [31] operated the CLWS process in a moving bed configuration using carrier particles of Fe2O3 (20 wt%) /ZrO2, in which 99.95% H2 (N2 free basis) was produced at 94.15% CH4 conversion.…”

Section: Introductionmentioning

confidence: 99%

“…Cho [31] operated the CLWS process in a moving bed configuration using carrier particles of Fe2O3 (20 wt%) /ZrO2, in which 99.95% H2 (N2 free basis) was produced at 94.15% CH4 conversion. Hua and Zhu [30,32] utilized a packed bed as the reactor to run CLWS, where Fe2O3 (50-60 wt%) /Al2O3 particles were used as the bed materials. The average purity of H2 on a N2 free basis was 98.0% when the CO or synthesis gas was fully converted.…”

Section: Introductionmentioning

confidence: 99%

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The behaviour of multiple reaction fronts during iron (III) oxide reduction in a non-steady state packed bed for chemical looping water splitting

et al. 2017

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Owing to the unclear temporal and spatial variations of axial solid conversion in a packed bed using iron (III) oxide as an oxygen carrier, we directly observe these variations by means of a sub-layer approach. The results indicate that the behaviour of the multiple reaction fronts during iron (III) oxide reduction by CO or H2 within a packed bed for chemical looping water splitting (CLWS) is strongly dependent on the reaction temperature. When the reaction temperature is lower than the merging temperature, three reaction fronts, i.e., Fe2O3-Fe3O4, Fe3O4-Fe0.947O and Fe0.947O-Fe, and three product zones, i.e., Fe3O4, Fe0.947O and Fe, will appear in the packed bed. In contrast, when the reaction temperature is higher than the merging temperature, the Fe2O3-Fe3O4 and Fe3O4-Fe0.947O fronts merge, leading to the disappearance of the Fe3O4 zone. As a result, only the Fe2O3-Fe0.947O and Fe0.947O-Fe fronts, as well as Fe0.947O and Fe zones will appear in the packed bed. These reduction behaviours are verified by two breakthrough curves, one for T < Tm and one for T > Tm, from the thermodynamically controlled reduction of iron (III) oxide in the packed bed. The reaction front movement model, which is proposed based on the reduction behaviour, can be used to determine the maximum solid conversion of the reduction step, i.e., the thermodynamic limitation of the reduction step, in the packed bed CLWS. The maximum solid conversion can reach 0.409 for the CO case and 0.554 for the H2 case. The first discovery of both the behaviours of the reaction fronts movement and the thermodynamic limitations of the reduction step standardizes the criteria for both the oxygen carrier evaluation and the optimization of the operating conditions and provides theoretical support for scaling up the packed bed and developing new technology for packed bed CLWS

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Section: Application Of the Reaction Fronts Movement Modelsupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The behaviour of multiple reaction fronts during iron (III) oxide reduction in a non-steady state packed bed for chemical looping water splitting

et al. 2017

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Section: Syngas/h 2 Production By the Chemical Looping With Water Splmentioning

confidence: 99%

“…Syngas, pyrolysis gases, bio-oil or bioethanol from biomass can be considered as fuels for CLWS [180,[278][279][280][281][282]. In this regard, a 30 kW th packed bed has been constructed and operated, demonstrating the feasibility of the concept [279]. However, major interest in the process is related to the use of biomass, namely biomass direct chemical looping (BDCL) [179,277], which includes the circulation of solids between three reactors (fuel reactor, steam reactor and air reactor), with the fuel reactor being a moving bed with fuel feeding in the middle of the reactor [70], or a fluidized bed [283].…”

Section: Syngas/h 2 Production By the Chemical Looping With Water Splmentioning

confidence: 99%

Negative CO2 emissions through the use of biofuels in chemical looping technology: A review

et al. 2018

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In order to limit the increase in the global average temperature to 2 °C or below, the Paris Agreement proposed the reduction of CO 2 emissions throughout this century. Bioenergy with CO 2 capture and storage (BECCS) technologies represent an interesting option in order to allow this goal to be metgoal, because they are able to achieve negative CO 2 emissions. Chemical looping (CL) is recognized as one of the most innovative CO 2 capture technologies owing to its low energy penalty. CL processes permit the utilization of renewable fuels in a nitrogen-free atmosphere, given that the required oxygen is supplied by solid oxygen carriers. The present work presents an overview of the status of development of the use of biofuels in chemical looping technologies, including chemical looping combustion (CLC) and chemical looping with oxygen uncoupling (CLOU) for the production of heat/electricity, as well as chemical looping reforming (CLR), chemical looping gasification (CLG) and chemical looping coupled with water splitting (CLWS) for syngas/H 2 generation. The main milestones in the development of such processes are shown, and the future trends and opportunities for CL technology with biofuels are discussed.

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Developing Oxygen Carriers for Chemical Looping Biomass Processing: Challenges and Opportunities

Zhou

Luo

et al. 2020

Advanced Sustainable Systems

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of global average temperature to within 2 °C compared to pre-industrial era, [2] it is necessary to rapidly reduce our reliance on fossil fuels. To this end, tremendous efforts have been put in to ramp up the capacities of renewable energy generation, including solar, wind, hydro, geothermal, tidal, etc. [3] However, non-biological renewables are available intermittenty, location-specific, and require costly infra

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Packed Bed Chemical Looping Platform: Design and Operation of 30kWth Pilot Unit

Cited by 6 publications

References 17 publications

The behaviour of multiple reaction fronts during iron (III) oxide reduction in a non-steady state packed bed for chemical looping water splitting

The behaviour of multiple reaction fronts during iron (III) oxide reduction in a non-steady state packed bed for chemical looping water splitting

Negative CO2 emissions through the use of biofuels in chemical looping technology: A review

Developing Oxygen Carriers for Chemical Looping Biomass Processing: Challenges and Opportunities

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