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Processes
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Advances in Chemical Looping Technologies
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Advances in Chemical Looping Technologies

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Chemical Processes and Systems".

Deadline for manuscript submissions: 30 July 2025 | Viewed by 2481

Special Issue Editors

Dr. Xudong Wang

E-Mail Website
Guest Editor
School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, China
Interests: chemical looping technologies; clean conversion/utilization of solid fuel; thermochemical energy storage
Special Issues, Collections and Topics in MDPI journals
Dr. Jingchun Yan

E-Mail Website
Guest Editor
School of Energy Science and Engineering, Nanjing Tech University, Nanjing, China
Interests: chemical looping technologies; bioresource production and conversion; functional materials synthesis; water and wastewater treatment

Special Issue Information

Dear Colleagues,

Chemical looping combustion has been demonstrated to be feasible for carbon separation during the combustion of fossil fuel in MW-scale industrial pilot studies, which has opened up new opportunities in this field. Chemical looping technologies are enjoying a prosperous research era.  Additionally, concepts based on chemical looping are being applied to many fields related to energy conversion, utilization and storage.

As a result of the global efforts of researchers, significant breakthroughs have been made in chemical looping technologies, from micro mechanisms to industrial demonstrations. Currently, it is necessary to collect the latest research results in this field regarding oxygen carrier synthesis, reactivity investigation, CFD-assisted reactor design, reactor operation and optimization, system engineering, etc.

This Special Issue, entitled “Advances in Chemical Looping Technologies”, seeks high-quality studies covering the latest advancements in chemical looping technologies. Topics of interest include, but are not limited to, the following:

  • Novel oxygen carrier materials and its reactivity evaluation;
  • New application of chemical looping concept;
  • Mechanism study of redox reactions in the field of energy;
  • AI in chemical looping technologies, such as oxygen carrier synthesis, reactor optimization, system performance prediction, etc.;
  • New operation results of chemical looping reactors;
  • CFD or process simulations of chemical looping reactor or systems;
  • Thermochemical energy storage based on cyclic reactions.

Dr. Xudong Wang
Dr. Jingchun Yan
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Processes is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • chemical looping technologies
  • oxygen carrier
  • carbon capture and utilization
  • clean energy
  • thermochemical energy storage

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (3 papers)

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Research

15 pages, 1714 KiB  
Article
Optimizing Lime-Based Cemented Paste Backfill for Potash Mines: A Comprehensive Loop Test Study on Slurry Transportation Characteristics
by Rongzhen Jin, Jiajie Li, Xue Wang, Xuming Ma, Desire Ntokoma, Huimin Huo, Siqi Zhang, Wen Ni and Michael Hitch
Processes 2025, 13(4), 1171; https://doi.org/10.3390/pr13041171 - 12 Apr 2025
Viewed by 202
Abstract
Utilizing potassium salt aggregates and waste brine to produce underground cemented filling materials can address the waste storage issue. However, it is essential for the backfill materials to meet specific transport characteristics. This paper examines the transportation characteristics of lime-cemented mine backfill for [...] Read more.
Utilizing potassium salt aggregates and waste brine to produce underground cemented filling materials can address the waste storage issue. However, it is essential for the backfill materials to meet specific transport characteristics. This paper examines the transportation characteristics of lime-cemented mine backfill for a potash mine. The parameters were optimized for the cemented backfill process of potash mines through loop experiments and model simulations. Results indicate that the slump and fluidity of the backfill slurry diminished with increasing lime content and solid concentration. Additionally, the growth rate of pressure loss at the bent pipe and the pressure loss per unit distance in a horizontal pipe increased rapidly over transportation time, indicating a decline in the flowability of the backfill slurry. The lime dosage and solid concentration must align with the backfill requirements. When the lime dosage is 0.5%, the solid content is 70–75%; conversely, with a lime dosage of 0.7% and solid content of 65%, the maximum pumpable time extends to 1 h. The compressive strength of the cured backfill material after 28 days exceeds 1.01 MPa, meeting the transportation requirements for 300 m vertical pipes and 5000 m horizontal pipes. In the case study, the actual flow rate of backfill slurry surpasses the calculated critical flow rate. The estimated and measured values of on-site pressure loss per unit distance in a horizontal pipe exhibit a strong correlation. As the pressure loss per unit distance in a horizontal pipe rises, the discrepancy between the calculated and measured values also increases. When the solid content exceeds 65%, the loop test slightly enhances the compressive strength of the lime-cemented backfill. The findings from this article can aid in determining the on-site backfill process parameters with lime as a binder. Full article
(This article belongs to the Special Issue Advances in Chemical Looping Technologies)
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14 pages, 2289 KiB  
Article
Performance Analysis of a Calcium Looping Process Integrating Biomass Sorption-Enhanced Gasification with CaCO3-Based Methane Reforming
by Shuaijie Xue, Xudong Wang and Guofu Liu
Processes 2025, 13(3), 892; https://doi.org/10.3390/pr13030892 - 18 Mar 2025
Viewed by 403
Abstract
The growing demand for sustainable energy solutions has led to significant interest in biomass gasification and methane reforming. To address this demand, a novel calcium looping process (CaLP) is proposed, which integrates biomass sorption-enhanced gasification (BSEG) with in situ calcium CaCO3-based [...] Read more.
The growing demand for sustainable energy solutions has led to significant interest in biomass gasification and methane reforming. To address this demand, a novel calcium looping process (CaLP) is proposed, which integrates biomass sorption-enhanced gasification (BSEG) with in situ calcium CaCO3-based methane reforming (CaMR). This process eliminates the need for CaCO3 calcination and facilitates the in situ utilization of CO2. The effects of gasification temperature, steam flowrate into the gasifier αG(H2O/C), reforming temperature, and steam flowrate into the reformer αR(H2O/C) were systematically evaluated. Increasing the gasification temperature from 600 °C to 700 °C enhances CO and H2 yields from 0.653 to 11.699 kmol/h and from 43.999 to 48.536 kmol/h, respectively. However, CaO carbonation weakens, reducing CaO conversion from 79.15% to 48.38% and increasing CO2 release. A higher αG(H2O/C) promotes H2 yield while suppressing CO and CH4 formation. In the CaMR process, raising the temperature from 700 °C to 900 °C improves CH₄ conversion from 64.78% to 81.29%, with a significant increase in CO and H2 production. Furthermore, introducing steam into the reformer enhances H2 production and CH4 conversion, which reaches up to 97.30% at αR(H2O/C) = 0.5. These findings provide valuable insights for optimizing integrated biomass gasification and methane reforming systems. Full article
(This article belongs to the Special Issue Advances in Chemical Looping Technologies)
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19 pages, 5935 KiB  
Article
Design and Verification of Key Components of a New Selective Catalytic Reduction System in a Petrochemical Captive Power Plant
by Jiarui Wu, Guofu Liu, Xin Zhang, Chao Zhang, Chao Li, Chenghong Gong, Xiaobo Zhou, Qiuping Gong, Shen Cheng and Jianguo Jiang
Processes 2023, 11(10), 2837; https://doi.org/10.3390/pr11102837 - 26 Sep 2023
Cited by 1 | Viewed by 1353
Abstract
A new selective catalytic reduction (SCR) system for captive power plants in the petrochemical industry was analyzed. The key components suitable for the target SCR system were obtained using computational fluid dynamics (CFD) numerical simulation combined with a cold physical model. The structural [...] Read more.
A new selective catalytic reduction (SCR) system for captive power plants in the petrochemical industry was analyzed. The key components suitable for the target SCR system were obtained using computational fluid dynamics (CFD) numerical simulation combined with a cold physical model. The structural characteristics of the SCR system were studied, and corresponding design schemes were obtained for the key components, such as the guide plate, the ammonia injection grid (AIG), the static mixer, and the rectifier grille. The distributions of the flue gas velocity and the NH3 concentration within the flue cross-section in front of the first layer catalyst were studied in detail. Synchronously, the pressure loss and the temperature reduction characteristics in the SCR system were also considered. CFD results showed that the average standard deviation of the flue gas velocity was about 11.61%, and the average standard deviation of the NH3 concentration distribution could reach about 3.79% under the five operating conditions. It could be concluded that the uniformity of the flue gas velocity and the NH3 concentration distribution within the above flue cross-section was guaranteed by comparing to the design standard of 15% and 5%, respectively. It was further found that the maximum pressure loss between the inlet and the first layer catalyst was about 106.64 Pa, and the temperature reduction characteristic of the entire SCR system could be maintained within ±0.01 °C, which indicated that no extreme adverse effect arose due to the introduce of the key components. The cold physical model experiment was accordingly conducted to verify the reliability of the above CFD results. The cold physical model experiment results showed that the average standard deviation of flue gas velocity was about 8.82%, and the average standard deviation of NH3 concentration distribution could reach about 4.21%. The maximum biases for the standard deviations of the flue gas velocity and the NH3 concentration distribution were approximately 4.83% and 1.18% under the five operating conditions. Based on the good agreement of the research results via the two different methods, the designed key components of a new SCR system could be confirmed to be feasible, which would benefit the deNOx performance of the SCR system. Full article
(This article belongs to the Special Issue Advances in Chemical Looping Technologies)
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