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Energies
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Carbon-Neutral Fuels and Applications
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Carbon-Neutral Fuels and Applications

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "B: Energy and Environment".

Deadline for manuscript submissions: closed (15 November 2023) | Viewed by 2282

Special Issue Editors

Prof. Dr. Donghoon Shin

E-Mail Website
Guest Editor
Department of Mechanical Engineering, School of Mechanical Engineering, Kookmin University, Seoul 02707, Republic of Korea
Interests: renewable energy; smart city; heat transfer; combustion
Special Issues, Collections and Topics in MDPI journals
Dr. Hossein Ali Yousefi Rizi

E-Mail Website
Guest Editor
Department of Mechanical Engineering, School of Mechanical and Automotive Engineering, Kookmin University, Seoul 136-702, Republic of Korea
Interests: safety risks; health effects
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The climate crisis is causing a rise in serious social demands for carbon-neutral fuels. Research on carbon-neutral fuels is being actively conducted, and fuels and fuel production systems based on various renewable energies are being proposed. Mainly, hydrogen, ammonia, and biomass fuels form the mainstream methods; however, convergence research is essential, in which evaluation of these fuels’ impact on carbon neutrality, economic feasibility, and social issues should be considered together. Active applications are possible only when the risks and social rejection of new carbon-neutral fuels are resolved. This Special Issue aims to present the current status and prospects of future fuel development based on renewable energy, and contains convergent content covering economic feasibility and social adaptation measures, as well as analysis of the fuel itself.

Prof. Dr. Donghoon Shin
Dr. Hossein Ali Yousefi Rizi
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. Energies is an international peer-reviewed open access semimonthly 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 2600 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

  • hydrogen
  • ammonia
  • biomass
  • combustion
  • pyrolysis
  • gasification
  • renewable energy
  • water electrolysis
  • chemical synthesis

Related Special Issue

Published Papers (2 papers)

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Research

20 pages, 13250 KiB  
Article
Study on Flow and Heat Transfer Characteristics of 25 kW Flameless Combustion in a Cylindrical Heat Exchanger for a Reforming Processor
by Ruiqi Zhu and Donghoon Shin
Energies 2023, 16(20), 7160; https://doi.org/10.3390/en16207160 - 19 Oct 2023
Viewed by 891
Abstract
Flameless combustion has advantages such as low pollution and uniform temperature in the combustion chamber, making it an excellent option for heat exchangers. Previous studies have focused solely on the flameless combustion phenomenon, without considering its interaction with the target being heated. In [...] Read more.
Flameless combustion has advantages such as low pollution and uniform temperature in the combustion chamber, making it an excellent option for heat exchangers. Previous studies have focused solely on the flameless combustion phenomenon, without considering its interaction with the target being heated. In this study, we conducted experimental and computational fluid analyses on a cylindrical reformer for reverse air injection flameless combustion. Typically, small-scale reformers of 10 kW or less are coaxial triple-tube cylindrical reformers. In contrast, multitubular reformers are used for larger-scale applications, since the heat transfer rate in single-burner cylindrical reformers decreases sharply as the scale increases. Flameless combustion, with high heat transfer efficiency, helps overcome the limitation of premixed burner. Compared with conventional premixed burners, flameless burner decreases the combustion gas outlet temperature by 30% at 25 kW while reducing energy consumption by 24% (owing to the high heat transfer rate) for a given cooling fluid outlet temperature. Furthermore, it is shown that introducing a ring at the combustion chamber exit can enhance combustion gas recirculation. The experimental result was confirmed through computational fluid analysis. It is concluded that for reverse air injection flameless combustion, the combustion gas recirculation rate in the combustion chamber is strongly related to the heat transfer. Full article
(This article belongs to the Special Issue Carbon-Neutral Fuels and Applications)
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14 pages, 3022 KiB  
Article
Effects of UV Light Treatment on Functional Group and Its Adsorption Capacity of Biochar
by Lizhen Qin and Donghoon Shin
Energies 2023, 16(14), 5508; https://doi.org/10.3390/en16145508 - 20 Jul 2023
Cited by 3 | Viewed by 1134
Abstract
This study aimed to investigate the impact of UV treatment on the surface functionality and adsorption capacity of biochar, with the goal of enhancing its effectiveness as an adsorbent for toluene. The surface and near-surface functionality and structure of biochar were studied to [...] Read more.
This study aimed to investigate the impact of UV treatment on the surface functionality and adsorption capacity of biochar, with the goal of enhancing its effectiveness as an adsorbent for toluene. The surface and near-surface functionality and structure of biochar were studied to evaluate the impact of UV treatment by utilizing X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and Brunauer–Emmett–Teller (BET) techniques. Biochar was generated by pyrolyzing wood chips at 900 °C without any oxidant injection in order to increase their carbon content. To boost biochar’s adsorption capability, UV irradiation on the biochar is utilized before and during the penetration process. Toluene was selected as the target absorbing material. The equilibrium adsorption capacity and rate were simulated using the Wheeler equation. It was found that the adsorption capacity of biochar increased significantly after pretreatment with ultraviolet light irradiation with a wavelength of 254 nm and an intensity of 280 μW/cm2 and reached a saturated state after 15 h. SEM and XPS showed that the UV-biochar modification technology not only improved the pore structure of biochar, but also increased the content of -O-containing functional groups on the surface of biochar and improved the adsorption capacity of biochar. The experimental results for sample M50_Uu demonstrated significant improvement in adsorption performance. The adsorption saturation time increased by 80%, and the equilibrium adsorption capacity rose from 12.80 mg/g to 54.60 mg/g. The main reason for the adsorption capacity increase by UV treatment is functional group formation, of which rate linearly increases with pretreatment energy until 11 W·hr/gbiochar, after which the increase rate is slow. Full article
(This article belongs to the Special Issue Carbon-Neutral Fuels and Applications)
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