Using Copper Ore and Hematite Fine Particles as Raw Materials of an Oxygen Carrier for Chemical Looping Combustion of Coal: Spray Drying Granulation and Performance Evaluation

Su, Zhao Gui; Wang, Yanan; Du, Hongwu; Ma, Jinchen; Zheng, Ying; Zhao, Haibo

doi:10.1021/acs.energyfuels.0c01023

Cited by 28 publications

(26 citation statements)

References 51 publications

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“…It should be noted that most of the oxygen carrier preparation methods investigated in the literature have not been implemented for large-scale production. Currently, the methods being attempted for oxygen carrier mass production at Huazhong University of Science and Technology (HUST) are cement bonding, , spray drying, and extrusion–spheronization Figure shows the images of two oxygen carriers prepared by the spray drying and extrusion–spheronization methods.…”

Section: Development Of Oxygen Carriers For Clc Of Coalmentioning

confidence: 99%

“…When judging from a worldwide perspective, Chinese researchers have contributed effective solutions to two of the bottleneck issues faced by the coal-derived CLC technique: (1) the preparation of low-cost while well-performing OC and (2) addressing the issue of the slow char gasification rate in the FR. For the development of industrial feasible OC particles, the Huazhong group has come up with a kind of thermal-neutral (in the FR) bimetallic OC, which incorporated iron ore (or red mud) and copper ore via cement bonding , or other scalable granulation techniques (e.g., spray drying and extrusion–spheronization). The raw materials used for the OC preparation were all of low cost, and its large-scale production can be easily implemented.…”

Section: Contributions Of Chinese Researchers To the Clc Fieldmentioning

confidence: 99%

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Chemical Looping Combustion of Coal in China: Comprehensive Progress, Remaining Challenges, and Potential Opportunities

Zhao

Tian

et al. 2020

Energy Fuels

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Chemical looping combustion (CLC) has emerged as an efficient and promising combustion technique for fossil fuels during the past few decades. The main advantages of CLC lie in its inherent CO 2 sequestration and cascade energy utilization, being primarily benefited from the in situ reactive separation facilitated by the circulation of a solid intermediate. Up to date, the research on the CLC-related oxygen carrier, reactor, and system has made extensive and in-depth development worldwide. CLC units with thermal power ranging from the kW th to MW th scale were demonstrated with fuels of different types (gaseous, liquid, and solid fuels). Over the past 20 years, Chinese researchers have made significant progress in chemical looping technologies, extending from fundamental oxygen carrier studies to the implementation of pilot-scale CLC units. For the use of solid fuels, such as coal, in CLC, it is a rather challenging task but a lot of opportunities also remain. As a result of the particular "rich coal, meager oil, and deficient gas" energy reserve characteristics, China has become the main research battlefield on CLC of coal these years. In this paper, the main advances and research status on CLC of coal in China are reviewed and appraised. The contents in this paper cover most of, if not all, the research hotspots on CLC of coal, i.e., oxygen carrier screening, reactor design/construction/operation, pollutant emission, reaction kinetics, and numerical simulation. Chinese researchers have made substantial contributions to two bottleneck issues faced by the coal-derived CLC technique, i.e., developing and preparing a low-cost while well-performing oxygen carrier and promoting the slow char gasification process in the fuel reactor. In addition, remaining challenges that constrain the development of large-scale CLC units and indeed deserve in-depth investigation are analyzed. Particular attention is paid to the following three key challenges: severe mismatch of reaction rates in CLC of coal, difficulty in attaining a good balance between the oxygen carrier performance and cost, and challenge in controlling solid circulation to manage heat and mass transfer. Accordingly, potential opportunities for future research and scaling-up of the coal-derived CLC technique are discussed. The academic thoughts that are highlighted here include (1) achieving a good compromise between the oxygen carrier cost and performance through the rational design of a multifunctional and composite oxygen carrier and its scalable preparation using cheap raw materials, (2) coordination among reactor modeling− reactor design−reactor operation to attain effective management of heat and mass transfer in the CLC reactor, and (3) a complex while effective matching matrix among coal type, oxygen carrier particle, and reactor configuration to acquire the optimal performance of the whole CLC system. Overall, this review summarizes the contributions of Chinese scholars to CLC of coal and presents how these research achievements benefit the commercial-sca...

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Section: Development Of Oxygen Carriers For Clc Of Coalmentioning

confidence: 99%

Section: Contributions Of Chinese Researchers To the Clc Fieldmentioning

confidence: 99%

Chemical Looping Combustion of Coal in China: Comprehensive Progress, Remaining Challenges, and Potential Opportunities

Zhao

Tian

et al. 2020

Energy Fuels

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“…This may be attributed to the better reactivity of Cu10.9Red89.1@C relative to pure red mud with volatiles/gasification gases, as presented in ref . Also, the total oxygen loss amounts from Cu10.9Red89.1@C and red mud are calculated to be 0.97 and 0.79 g, respectively, based on the calculation method in refs and . They exceed the theoretical value of 0.71 g (assuming that Fe 2 O 3 is reduced to Fe 3 O 4 ).…”

Section: Results and Discussionmentioning

confidence: 83%

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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“…There are six papers on this topic. Su et al 8 report on a cheap oxygen carrier by mixing copper ore and hematite fine particles together via spray drying granulation, and the CLC performance of the oxygen carrier is evaluated in a batch fluidized bed reactor with three different coals as fuel. Ge et al 9 investigate the characteristics of Zhundong coal ash in CLC as well as the effects of coal ash on the reaction performance of the hematite oxygen carrier.…”

Section: ■ Clc Of Fossil Fuelsmentioning

confidence: 99%

Virtual Special Issue of Recent Research Advances in China: Chemical Looping

2020

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Using Copper Ore and Hematite Fine Particles as Raw Materials of an Oxygen Carrier for Chemical Looping Combustion of Coal: Spray Drying Granulation and Performance Evaluation

Cited by 28 publications

References 51 publications

Chemical Looping Combustion of Coal in China: Comprehensive Progress, Remaining Challenges, and Potential Opportunities

Chemical Looping Combustion of Coal in China: Comprehensive Progress, Remaining Challenges, and Potential Opportunities

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

Virtual Special Issue of Recent Research Advances in China: Chemical Looping

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