Synergetic effects of cement bonded copper ore and red mud as oxygen carrier during in-situ gasification chemical looping combustion of coal char

Wang, Yanan; Tian, Xin; Zhao, Haibo; Liu, Kunlei; Dong, Yunchang; Su, Zhao Gui; Chen, Zheng

doi:10.1016/j.fuel.2021.121295

Cited by 22 publications

(10 citation statements)

References 30 publications

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“…In addition, chalcopyrite was tested with an anthracite coal in a batch-fluidized bed reactor [14]. The magnetite showed a medium reactivity and high resistance against agglomeration, whereas the chalcopyrite exhibited high reactivity but tended to agglomerate when the temperature was more than 950 • C. The combination of these ores can generate a bimetallic oxygen carrier and lead to a synergy effect, as well [21,26]. Cement, a common construction material, was proved as a good candidate for binding copper and iron ores to form an oxygen carrier for the CLC process [25].…”

Section: The Magnetite Chalcopyrite and Cementsmentioning

confidence: 99%

“…Another option is the combination of copper ore and iron ore to form a new oxygen carrier, which can benefit the synergic effect of copper and iron [21,24]. In this case, some new attempts have been carried out to combine copper ore and iron ore and redmud using a cement binder through simple mechanical mixing [25,26] or an extrusion-spheronization method [27]. In these works, aluminosilicate cements have been used to test their suitability as binders for oxygen carrier preparation from natural ores.…”

Section: Introductionmentioning

confidence: 99%

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Selecting and Testing of Cement-Bonded Magnetite and Chalcopyrite as Oxygen Carrier for Chemical-Looping Combustion

Zheng

Mei

et al. 2022

Energies

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Combining iron and copper ores can generate an oxygen carrier that has a synergic effect of high temperature resistance and high reactivity. In this work, typical cements available in the market were studied as binders to bind magnetite and chalcopyrite to develop a suitable oxygen carrier for chemical-looping combustion (CLC). A first selection step suggested that an aluminate cement, namely CA70, could favor the generation of oxygen carrier particles having good crushing strength, good particle yield, and high reactivity. The CA70-bonded oxygen carrier was then subjected to cyclic tests with CH4, CO, and H2 in reduction and in air oxidation at temperatures of 850, 900, and 950 °C with gas concentrations of 5, 10, 15, and 20% in a batch-fluidized bed reactor. The increase in temperature promoted the fuel conversion. At 950 °C, the conversions of CH4 and CO reached up to 80.4% and 99.2%, respectively. During more than 30 cycles, the oxygen carrier kept a similar reactivity to the fresh carrier and maintained its composition and physical properties. The oxygen transport capacity was maintained at 21–23%, and the phases were CuO, Fe2O3, Al2O3, and minor CaS. In the used sample, some grains were observed, but the morphology was not greatly changed. Agglomeration was absent during all the cycles, except for the deep reduction with H2.

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Section: The Magnetite Chalcopyrite and Cementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Selecting and Testing of Cement-Bonded Magnetite and Chalcopyrite as Oxygen Carrier for Chemical-Looping Combustion

Zheng

Mei

et al. 2022

Energies

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“…In our notation system, Cu20Fe80@C and Cu10.9Red89.1@C represent that the mixing weight ratios of copper ore (marked as Cu) to hematite (marked as Fe) and copper ore to red mud (marked as Red) in the OCs are 20:80 and 10.9:89.1, respectively, and the binder of cement (marked as C) added to the prepared OC always accounts for 20 wt %. These weight ratios are determined on the basis of our previous investigation, , and the detailed preparation process can be seen in ref . Moreover, the red mud and Fe100@C (representing 80 wt % hematite bonded with 20 wt % cement) OCs are also prepared.…”

Section: Methodsmentioning

confidence: 99%

Performance Evaluation of Inexpensive Cu/Fe-Based Oxygen Carriers in Chemical Looping Gasification of Coal

Wang

Liu

2021

Energy Fuels

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Solid fuel chemical looping gasification (CLG) is an innovative syngas production technology that avoids expensive air separation requirements. However, solid fuel CLG requires the development of easily available, inexpensive oxygen carrier (OC) particles with tunable reactivity and good cycling performance. In this paper, the low-cost Cu/Fe-based OCs, derived from waste ore particles and/or bauxite residues, are comprehensively evaluated for potential coal-fed CLG application in a batch fluidized bed reactor. Among these OCs, the red mud and Cu20Fe80@C (16 wt % copper ore bonded with 64 wt % hematite by 20 wt % cement) OCs exhibit better CLG performances in terms of gasification time and syngas quality. Red mud exhibits promise for the Fischer−Tropsch synthesis, while Cu20Fe80@C is in favor of the H 2 -rich chemical synthesis. Furthermore, coal and char gasification rates are closely related to both the lattice oxygen donation capacity and the alkali metal content in the OC, while the reduced OCs catalyze the conversion of gasification gas to the H 2 -rich products. In addition, the reduced OCs behave differently during the water−gas shift (WGS) and steam−iron reactions (which factually provide an approach to tune the syngas quality) in a fixed bed reactor. Reduced Cu20Fe80@C exhibits high catalytic activity toward the WGS reaction, followed by reduced Fe100@C (80 wt % hematite bonded by 20 wt % cement) and reduced red mud. With regard to the H 2 -rich production, the Cu20Fe80@C OC exhibits a clear advantage over red mud once both OCs experience deep reductions. Cyclic redox tests demonstrate that the red mud and Cu20Fe80@C OCs can achieve stable syngas production and exhibit good anti-sintering behavior.

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“…This paper uses fine waste particles of copper ore and red mud as raw materials, and the hydroforming method is adopted to prepare the low-cost composite OCs. This work further evaluates the promising copper ore/red mud composite OC (validated from our previous batch fluidized bed experiments , ) under continuous operation conditions and an essential test step before industrial applications. The adjustable semi-continuous fluidized bed reactor is redesigned and retrofitted, and then the relation of bed inventory as a function of the superficial fluidization velocity is measured, which guides the design of experimental cases.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the batch fluidized bed tests showed good reactivity and cyclability of the Cu−Fe composite OC. Considering the catalytic effect of alkali metal contents on char gasification, cement-bonded fine waste particles (<0.1 mm) of copper ore and red mud were used as the OC, 19 and this cheap composite OC can facilitate the char gasification process and exhibit good reactivity toward char gasification products. At the same time, we also prepared porous spherical OC particles through the spray-drying method 20 and the extrusion−spheronization method 21 using fine Cu/Fe ore particles as raw materials.…”

Section: Introductionmentioning

confidence: 99%

Semi-continuous Operation of Chemical Looping Combustion of Coal Using a Low-Cost Composite Oxygen Carrier

Wang

et al. 2022

Energy Fuels

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To reach the carbon peak by 2030 and achieve carbon neutrality by 2060, the implementation of low-carbon combustion approaches for fossil fuels (especially coal, a high-carbon fuel) is urgent in China. Chemical looping combustion (CLC) has been considered as one of the most promising technologies for low-carbon, efficient, and clean utilization of coal. However, a low-cost and high-performance oxygen carrier (OC) holds the bottleneck that constrains the industrial application of coal-fueled CLC. In this paper, a low-cost composite OC named Cu13.0Red87.0@C (with the mixing mass ratio of copper ore to red mud being 13.0:87.0, except for a 20 wt % cement bonder) was first prepared by the hydroforming method and then systematically evaluated by designing CLC tests in a semi-continuous fluidized bed using lignite as fuel. The results showed that this composite OC exhibited superior combustion performance in comparison to pure red mud. Moreover, it was found that increasing the temperature could significantly improve the average carbon capture efficiency but had a relatively small positive effect on the average CO2 yield. Additionally, with the elevation of the oxygen/fuel ratio, the resulting average carbon capture efficiency and average CO2 yield both tended to increase. Generally, the semi-continuous unit can simulate the continuously operated fuel reactor with an adjustable bed inventory and solid circulation rate, and it is easy to attain smooth operation of ca. 30 min, achieving both carbon capture efficiency and a CO2 yield of ca. 90%.

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Synergetic effects of cement bonded copper ore and red mud as oxygen carrier during in-situ gasification chemical looping combustion of coal char

Cited by 22 publications

References 30 publications

Selecting and Testing of Cement-Bonded Magnetite and Chalcopyrite as Oxygen Carrier for Chemical-Looping Combustion

Selecting and Testing of Cement-Bonded Magnetite and Chalcopyrite as Oxygen Carrier for Chemical-Looping Combustion

Performance Evaluation of Inexpensive Cu/Fe-Based Oxygen Carriers in Chemical Looping Gasification of Coal

Semi-continuous Operation of Chemical Looping Combustion of Coal Using a Low-Cost Composite Oxygen Carrier

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