Binary-ore oxygen carriers prepared by extrusion–spheronization method for chemical looping combustion of coal

Dong, Yunchang; Wang, Yanan; Ma, Jinchen; Bu, Hengfeng; Zheng, Chuanbao; Zhao, Haibo

doi:10.1016/j.fuproc.2021.106921

Cited by 13 publications

(7 citation statements)

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“…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%

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: 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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“…As for the yields of CO, CH 4 , and H 2 , they always keep low values below 5% except in the first cycle. Especially, IOC@20C shows nothing less than other OCs in CO 2 yield when compared with the Cu20Fe80@C bonded by cement (94% in the 30th cycle), 25 FeCu-10 M through the extrusion-spheronization method (below 94% in the 20 cycles), 44 and Cu20Fe80 through the spray drying method (96% in the 10th cycle) 33 in our previous researches.…”

Section: Performance In the Ch 4 Clc The Evolution Of The Concentrati...mentioning

confidence: 65%

“…Drawing from the proposition of Lyngfelt that the OC with a crushing strength beyond 1 N has the potential to carry out a prolonged circulation process in fluidized beds at optimum conditions, we employed the extrusion-spheronization method to strengthen the structure of OC, and the prepared OCs presented a dense pore structure and a crushing strength beyond 2 N . However, the production capacity of the method is relatively low, e.g., 192 kg/day.…”

Section: Introductionmentioning

confidence: 99%

Industrial-Scale Preparation of Biore Oxygen Carriers for Chemical Looping Combustion via a Hydroforming Method

Liu,

Bu,

Zou

et al. 2024

Energy Fuels

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Chemical looping combustion (CLC) has entered the stage of engineering demonstration, thus urgently requiring industrial-scale preparation of an oxygen carrier (OC). This work proposes a novel hydroforming method for the industrial-scale preparation of OC. The cheap copper ore and iron ore fines are active components, and cement is the binder. First, the biore OCs through a laboratory hydraulic press are tested in a thermogravimetric analyzer (TGA) and a batch fluidized bed (BFB) reactor. The optimal loading ratio of cement is 20 wt %, and a CH 4 conversion above 90% is achieved. Second, the hydroforming is scaled up to the industrial scale. The industrial-scale OC shows favorable performance in the 100-cycle H 2 /CH 4 /coal CLC tests, achieving an oxygen loss ratio of 6 wt %, a CH 4 conversion of around 90%, and a combustion efficiency of 95%, respectively. Finally, the characterization results suggest that the OCs always meet the crushing strength demand and their specific surface areas get larger after 100 cycles. They demonstrate stable crystal structures with Fe 2 O 3 and CuFe 2 O 4 , relatively rich pore structures, and evenly distributed elements throughout the cycles. The industrial-scale hydroforming method is a competitive candidate for OC preparation, considering the favorable performance of prepared OC and its high compatibility with raw materials.

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“…Considering the high cost of copper, oxygen carriers based on copper and iron has been synthetized using copper ore and hematite as raw materials [28]. Fine particles of raw materials (<100 μm) were mechanically mixed to produce oxygen carrier particles in the desired size of 100-300 μm either by wet mixing, extrusionspheronization [29] or spray drying [30]. Alternatively, redmud may be used also as the iron source [31].…”

Section: (Mnmentioning

confidence: 99%

Evaluation of oxygen carriers based on manganese‑iron mixed oxides prepared from natural ores or industrial waste products for chemical looping processes

Zornoza

Mendiara

Abad

2022

Fuel Processing Technology

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Binary-ore oxygen carriers prepared by extrusion–spheronization method for chemical looping combustion of coal

Cited by 13 publications

References 50 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

Industrial-Scale Preparation of Biore Oxygen Carriers for Chemical Looping Combustion via a Hydroforming Method

Evaluation of oxygen carriers based on manganese‑iron mixed oxides prepared from natural ores or industrial waste products for chemical looping processes

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