Advances in rigid porous high temperature filters

Li, Shuo; Baeyens, Jan; Dewil, Raf; Appels, Lise; Zhang, Huili; Deng, Yimin

doi:10.1016/j.rser.2021.110713

Cited by 34 publications

(23 citation statements)

References 53 publications

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“…Similar research efforts on reducing the CO 2 emissions from thermal processes were also presented for different fields, with a specific target of CO 2 modeling, such as in a large-scale coal-fired thermal power plant [24], in integrated processing of liquified natural gas [25], in a multigeneration cascade system [26], in the pyrolysis reaction of lignocellulosic waste [27], or through the integration of rigid porous high-temperature filters in thermal processes [28], among others.…”

Section: Moldenauer Et Al [23]mentioning

confidence: 92%

The Direct Reduction of Iron Ore with Hydrogen

Zhang

Nie

et al. 2021

Sustainability

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The steel industry represents about 7% of the world’s anthropogenic CO2 emissions due to the high use of fossil fuels. The CO2-lean direct reduction of iron ore with hydrogen is considered to offer a high potential to reduce CO2 emissions, and this direct reduction of Fe2O3 powder is investigated in this research. The H2 reduction reaction kinetics and fluidization characteristics of fine and cohesive Fe2O3 particles were examined in a vibrated fluidized bed reactor. A smooth bubbling fluidization was achieved. An increase in external force due to vibration slightly increased the pressure drop. The minimum fluidization velocity was nearly independent of the operating temperature. The yield of the direct H2-driven reduction was examined and found to exceed 90%, with a maximum of 98% under the vibration of ~47 Hz with an amplitude of 0.6 mm, and operating temperatures close to 500 °C. Towards the future of direct steel ore reduction, cheap and “green” hydrogen sources need to be developed. H2 can be formed through various techniques with the catalytic decomposition of NH3 (and CH4), methanol and ethanol offering an important potential towards production cost, yield and environmental CO2 emission reductions.

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Section: Moldenauer Et Al [23]mentioning

confidence: 92%

The Direct Reduction of Iron Ore with Hydrogen

Zhang

Nie

et al. 2021

Sustainability

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“…It should moreover be reminded that extra reactant and thermal operation costs should be added, but a good product and heat management should reduce these to a minimum. The loss of reactant from the fluidized bed was minimum due to the use of metal-fiber filters at the exit of the reactor [30]. CO 2 should be separated and used in the reverse reaction.…”

Section: Cycling Performancementioning

confidence: 99%

Water Splitting by MnOx/Na2CO3 Reversible Redox Reactions

Liu

Dewil

et al. 2022

Sustainability

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Thermal water splitting by redox reactants could contribute to a hydrogen-based energy economy. The authors previously assessed and classified these thermo-chemical water splitting redox reactions. The Mn3O4/MnO/NaMnO2 multi-step redox cycles were demonstrated to have high potential. The present research experimentally investigated the MnOx/Na2CO3 redox water splitting system both in an electric furnace and in a concentrated solar furnace at 775 and 825 °C, respectively, using 10 to 250 g of redox reactants. The characteristics of all reactants were determined by particle size distribution, porosity, XRD and SEM. With milled particle and grain sizes below 1 µm, the reactants offer a large surface area for the heterogeneous gas/solid reaction. Up to 10 complete cycles (oxidation/reduction) were assessed in the electric furnace. After 10 cycles, an equilibrium yield appeared to be reached. The milled Mn3O4/Na2CO3 cycle showed an efficiency of 78% at 825 °C. After 10 redox cycles, the efficiency was still close to 60%. At 775 °C, the milled MnO/Na2CO3 cycles showed an 80% conversion during cycle 1, which decreased to 77% after cycle 10. Other reactant compounds achieved a significantly lower conversion yield. In the solar furnace, the highest conversion (>95%) was obtained with the Mn3O4/Na2CO3 system at 775 °C. A final assessment of the process economics revealed that at least 30 to 40 cycles would be needed to produce H2 at the price of 4 €/kg H2. To meet competitive prices below 2 €/kg H2, over 80 cycles should be achieved. The experimental and economic results stress the importance of improving the reverse cycles of the redox system.

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“…Whereas the original FCC unit lost on average approximately 5 tons catalyst per day at a cost of £1000 per ton, 7 days per week, 52 weeks per year, new de-dusting equipment [18] has reduced this considerably. These losses routinely arise largely form attrition of the catalyst [19].…”

Section: Figure 2 Simplified Fcc Systemmentioning

confidence: 99%

Fluidized Bed Technology: Challenges and Perspectives

Baeyens

Dewil

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Fluidized beds are recognized as important gas-solid contacting technology in chemical synthesis reactors, in combustion/gasification/pyrolysis of coal and biomass, in multiple drying applications, in solar thermal energy capture and storage, and more recently also in the production of hydrogen by either catalytic steam reforming of organic feedstock, or thermal water splitting using oxidation-reduction cycles. Although the process understanding and operational experience has significantly been expanded over the past decades, some challenges remain the be dealt with, as discussed in the paper. These challenges are mostly of gas-solid hydrodynamic nature.

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Advances in rigid porous high temperature filters

Cited by 34 publications

References 53 publications

The Direct Reduction of Iron Ore with Hydrogen

The Direct Reduction of Iron Ore with Hydrogen

Water Splitting by MnOx/Na2CO3 Reversible Redox Reactions

Fluidized Bed Technology: Challenges and Perspectives

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