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Atmosphere
Special Issues
Syngas Production by Chemical Looping Gasification
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Syngas Production by Chemical Looping Gasification

A special issue of Atmosphere (ISSN 2073-4433). This special issue belongs to the section "Air Pollution Control".

Deadline for manuscript submissions: closed (30 November 2022) | Viewed by 4726

Special Issue Editors

Dr. Kun Zhao

E-Mail Website
Guest Editor
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences (CAS), Guangzhou 510640, China
Interests: chemical looping; syngas production; CO2 utilization; OCM
Special Issues, Collections and Topics in MDPI journals
Dr. Xing Zhu

E-Mail Website
Guest Editor
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
Interests: chemical looping; metal oxides; oxygen storage capacity; redox catalyst
Dr. Anqing Zheng

E-Mail Website
Guest Editor
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Interests: biomass thermochemical conversion; chemical looping conversion; biomass pyrolysis; biomass gasification; alkane conversion
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With growing concerns about limited fossil fuel reserves and global warming, it is imperative to develop clean and sustainable energy conversion technologies. Among these technologies, chemical looping technology has attracted great attention from the scientific and industrial communities since it can achieve inherent CO2 capture and provides better energy efficiency than existing CO2 capture technologies. Chemical looping gasification is a promising technology that utilizes lattice oxygen within oxygen carriers instead of molecular oxygen as a gasifying agent to produce syngas. Syngas, primarily consisting of H2 and CO, has been employed as a versatile platform for generating various desired products, such as electric power, heat, hydrogen, methane, methanol, dimethyl ether, Fischer–Tropsch (FT) liquids, and ammonia.

The aim of this Special Issue is to provide recent advances in the field of syngas production by chemical looping gasification. Original results from chemical looping gasification from coal, biomass, methane, solid waste, etc., are all welcome contributions. With the recent expansion of research showing that oxygen carriers play important roles in the chemical looping process, this Special Issue is also an appropriate venue for papers that deal with the design of oxygen carriers, process development and optimization, reactor design, reaction mechanisms, reaction kinetics, pollution control, and CO2 capture research.

Dr. Kun Zhao
Dr. Xing Zhu
Dr. Anqing Zheng
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. Atmosphere 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
  • gasification
  • oxygen carriers
  • CO2 capture
  • syngas

Published Papers (3 papers)

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Research

17 pages, 4865 KiB  
Article
Screening of Potential Additives for Alleviating Slagging and Fouling during MSW Incineration: Thermodynamic Analysis and Experimental Evaluation
by Gang Chen, Shunshun Kang, Kun Zhao, Anqing Zheng and Zengli Zhao
Atmosphere 2022, 13(8), 1163; https://doi.org/10.3390/atmos13081163 - 22 Jul 2022
Cited by 4 | Viewed by 1080
Abstract
The formation of slagging and fouling during municipal solid waste (MSW) incineration not only significantly affects heat transfer, but also results in shortened operating cycles. In order to solve the issues, the effect of different additives on the migration and transformation patterns of [...] Read more.
The formation of slagging and fouling during municipal solid waste (MSW) incineration not only significantly affects heat transfer, but also results in shortened operating cycles. In order to solve the issues, the effect of different additives on the migration and transformation patterns of alkali/alkaline earth metals (AAEM) and chlorine during MSW incineration is screened based on the Gibbs energy minimization method. The effect of potential additives on the ash fusion temperature and combustion reactivity of MSW char is subsequently verified and evaluated by experimental methods. The thermodynamic equilibrium analysis shows that Al(NO3)3, Ca(NO3)2, and Mg(NO3)2 have great potential to increase the ash fusion temperature. The experimental investigation confirms that the addition of Al(NO3)3, Ca(NO3)2, and Mg(NO3)2 significantly increases the ash fusion temperature. The order of increasing the ash fusion temperature by different additives is Mg(NO3)2 > Ca(NO3)2 > Al(NO3)3. The addition of Mg(NO3)2 significantly increased the initial deformation temperature, softening temperature, hemispheric temperature, and flow temperature of ash from 1180, 1190, 1200, and 1240 °C to 1220, 1230, 1240, and 1260 °C, respectively. The addition of Cu(NO3)2, Fe(NO3)3, and KMnO4 significantly decreases the temperature at the maximum weight loss rate of MSW char, while increasing the maximum weight loss rate. Additionally, Cu(NO3)2 shows the best performance in improving the combustion reactivity of MSW char. The addition of Cu(NO3)2 evidently increases the maximum weight loss rate from 0.49 to 0.54% °C−1. Therefore, it is concluded that Mg(NO3)2 and Cu(NO3)2 are supposed to be the most potential candidates for efficient additives. This study presents an efficient and economical method to screen potential additives for alleviating slagging and fouling during MSW incineration. Full article
(This article belongs to the Special Issue Syngas Production by Chemical Looping Gasification)
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25 pages, 2553 KiB  
Article
MP-PIC Simulation of Biomass Steam Gasification Using Ilmenite as an Oxygen Carrier
by Timo Dymala, Shen Wang, Kolja Jarolin, Tao Song, Laihong Shen, Maksym Dosta and Stefan Heinrich
Atmosphere 2022, 13(7), 1009; https://doi.org/10.3390/atmos13071009 - 22 Jun 2022
Cited by 3 | Viewed by 1797
Abstract
Biomass chemical looping gasification (BCLG) is a complex process for the conversion of biomass using an oxygen carrier, which is influenced by various operating parameters. For a better understanding of this process, biomass steam gasification using ilmenite as an oxygen carrier is numerically [...] Read more.
Biomass chemical looping gasification (BCLG) is a complex process for the conversion of biomass using an oxygen carrier, which is influenced by various operating parameters. For a better understanding of this process, biomass steam gasification using ilmenite as an oxygen carrier is numerically investigated in this work using the multiphase particle-in-cell (MP-PIC) method, which is a modified Euler–Lagrange approach. As a first step, a reduced reaction network for biomass gasification is investigated in a spouted bed. As a second step, the reaction network is coupled with oxygen carrier kinetics of ilmenite for the simulation of BCLG in a lab-scale fluidized bed. For both steps, the influence of the main operating parameters, such as reactor temperature, steam-to-biomass ratio, and oxidation degree of the oxygen carrier, are investigated and compared with experimental data from the literature. In general, the simulations show satisfying results and the predicted syngas compositions with varied operating parameters are in good agreement with the experimental data. Furthermore, the main trends for the syngas composition are predicted correctly and the oxidation degree of the oxygen carrier has a significant influence on the resulting syngas composition confirming the experimental results. Full article
(This article belongs to the Special Issue Syngas Production by Chemical Looping Gasification)
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18 pages, 4149 KiB  
Article
Evaluation of Different Oxygen Carriers for Chemical Looping Reforming of Toluene as Tar Model Compound in Biomass Gasification Gas: A Thermodynamic Analysis
by Zhiqi Wang, Jinzhi Zhang, Jingli Wu, Tao He and Jinhu Wu
Atmosphere 2022, 13(6), 887; https://doi.org/10.3390/atmos13060887 - 30 May 2022
Cited by 1 | Viewed by 1341
Abstract
A thermodynamic study on a toluene chemical looping reforming process with six metal oxides was conducted to evaluate the product distribution for selecting an appropriate oxygen carrier with thermodynamic favorability towards high syngas yield. The results show that a suitable operation temperature for [...] Read more.
A thermodynamic study on a toluene chemical looping reforming process with six metal oxides was conducted to evaluate the product distribution for selecting an appropriate oxygen carrier with thermodynamic favorability towards high syngas yield. The results show that a suitable operation temperature for most oxygen carriers is 900 °C considering syngas selectivity and solid C formation whether the toluene is fed alone or together with fuel gas. The syngas selectivity of all oxygen carriers decreases with the increasing equivalence ratio, but the decrease degrees are quite different due to their different thermodynamic natures. With the increasing amounts of H2 and CO, the syngas selectivity for various oxygen carriers correspondingly decreases. The addition of CO2 and H2O(g) benefits reducing the solid C formation, whereas the addition of CH4 leads to more solid C being produced. Under the simulated gasification gas atmosphere, a synergetic elimination of solid C and water–gas shift reactions are observed. In terms of syngas selectivity, Mn2O3 possesses the best performance, followed by CaFe2O4 and Fe2O3, but NiO and CuO exhibit the lowest performance. BaFe2O4 presents a high H2 selectivity but a very poor CO selectivity due to the formation of BaCO3, which has a high thermodynamic stability below 1200 °C. Nevertheless, Mn2O3 is more likely to form solid C than feeding toluene alone and has a lower melting point. Considering syngas selectivity, carbon deposit and melting point, CaFe2O4 exhibits the highest performance concerning the tar chemical looping. Full article
(This article belongs to the Special Issue Syngas Production by Chemical Looping Gasification)
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