Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
4.7
3.5
Journals
Processes
Special Issues
Thermochemical Conversion of Solid Fuels and Wastes
share announcement

Thermochemical Conversion of Solid Fuels and Wastes

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

Deadline for manuscript submissions: 31 October 2024 | Viewed by 3068

Special Issue Editors

Dr. Weiwei Xuan

E-Mail Website
Guest Editor
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
Interests: gasification; solid waste; slagging; hydrogen
Dr. Markus Reinmöller

E-Mail Website
Guest Editor
DTU Engineering Technology, Technical University of Denmark, Lautrupvang 15, 2750 Ballerup, Denmark
Interests: biomass; gasification; pyrolysis
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

With the increasing demand for energy, more types of solid fuels are receiving scholarly attention. Coal holds a dominating position in the energy system, and a scarcity of coal may hinder the pace of modernization and economic progress. Other solid fuels, or regarded as waste under some situations, including industrial waste, municipal waste, agricultural waste, and forest waste, have attracted increasing attention due to the massive output of the materials and the potential energetic and chemical benefits. Solid waste can be considered as a complement to the energy supply due to the advantages of high yield, low cost, carbon-rich materials, and a range of recyclable metal and inorganic compounds. The utilization of solid waste can alleviate the issue of the increasing depletion of fossil energy and realize the upgrading cycle of waste. Thermochemical conversion including pyrolysis, gasification, etc., offering an effective and sustainable solution for solid fuels.

This Special Issue of Processes on the“Thermochemical Conversion of Solid Fuels and Wastes” aims to present high-quality research studies addressing challenges in the broad area of thermochemical conversion process reactions and control. Wastes cannot replace our current dependence on coal, but they can be highly complementary. Thus, we welcome authors to submit studies on co-conversions, such as the co-pyrolysis/gasification of coal and other solid waste into different chemicals, which show good application prospects and studies of advanced methods and novel findings. This Special Issue aims to publish comprehensive overviews and in-depth technical research papers which address the recent progress in the thermochemical conversion of solid fuels and wastes. Research involving experimental and numerical studies, recent developments, and current state-of-the-art and emerging technologies in this field are highly encouraged.

Dr. Weiwei Xuan
Dr. Markus Reinmöller
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

  • pyrolysis
  • gasification
  • chemical conversion
  • combustion
  • coal, biomass
  • solid waste
  • simulation

Published Papers (3 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

14 pages, 10416 KiB  
Article
Study on the Medium-Temperature Reduction Behavior of Methane and Laterite Nickel Ore
by Ying Shi, Sheng Qi, Xingyang Liu, Shoujun Liu, Jinyao Yan and Song Yang
Processes 2023, 11(12), 3291; https://doi.org/10.3390/pr11123291 - 24 Nov 2023
Cited by 1 | Viewed by 644
Abstract
Under the background of carbon peaking and carbon neutrality, compared with a traditional carbon thermal reduction to produce nickel, gas-based reduction has outstanding advantages in efficiency and carbon reduction. However, there are few studies on gas-based reduction at present. This article explores the [...] Read more.
Under the background of carbon peaking and carbon neutrality, compared with a traditional carbon thermal reduction to produce nickel, gas-based reduction has outstanding advantages in efficiency and carbon reduction. However, there are few studies on gas-based reduction at present. This article explores the reduction behavior of methane on laterite nickel ore. The effects of different reaction temperatures, reaction times and gas concentrations on the reduction reaction were studied. The phase and morphology of laterite nickel ore and its calcined products were analyzed by XRD, SEM-EDS and gas chromatography. The results show that when the reduction temperature is 900 °C, the reduction time is 60 min, and the concentration of CH4 is 50%, a concentrate with a nickel grade of 3.06% and a recovery of 52.09% can be obtained. After analysis, the reason for the low nickel grade and recovery rate in the concentrate is, on the one hand, due to the incomplete reduction of NiO, and a large amount of nickel still exists in the silicate in the tailings; on the other hand, it is due to the fine grain size of the partially reduced nickel iron alloy, which is lost in the tailings and filtrate. Full article
(This article belongs to the Special Issue Thermochemical Conversion of Solid Fuels and Wastes)
►▼ Show Figures

Figure 1

15 pages, 4792 KiB  
Article
Exploration of Pyrolysis Behaviors of Waste Plastics (Polypropylene Plastic/Polyethylene Plastic/Polystyrene Plastic): Macro-Thermal Kinetics and Micro-Pyrolysis Mechanism
by Weiwei Xuan, Shiying Yan and Yanwu Dong
Processes 2023, 11(9), 2764; https://doi.org/10.3390/pr11092764 - 15 Sep 2023
Viewed by 1368
Abstract
Pyrolysis is a promising technology used to recycle both the energy and chemicals in plastics. Three types of plastics, polyethylene plastic (PE), polypropylene plastic (PP) and polystyrene plastic (PS) were investigated using thermogravimetry–mass spectrometry (TG–MS) and reactive force field molecular dynamics (ReaxFF-MD) simulation. [...] Read more.
Pyrolysis is a promising technology used to recycle both the energy and chemicals in plastics. Three types of plastics, polyethylene plastic (PE), polypropylene plastic (PP) and polystyrene plastic (PS) were investigated using thermogravimetry–mass spectrometry (TG–MS) and reactive force field molecular dynamics (ReaxFF-MD) simulation. The thermogravimetric analysis showed that all three plastics lost weight during the pyrolysis in one step. The thermal decomposition stability is PS < PP < PE. The activation energies and reaction mechanism function of the three plastics were determined by the Kissinger and CR methods. Meanwhile, the ReaxFF-MD combined with density functional theory (DFT) was used to calculate the kinetics, as well as explore the pyrolysis mechanism. The calculated kinetic results agree well with the experimental methods. The common pyrolysis reaction process follows the dissociation sequence of the polymer to polymeric monomer and, then, to the gas molecules. Based on the bond length between the monomers and the bond dissociation energy for different plastics, the required energy for polymer dissociation is PS < PP < PE, which microscopically explains the macro-activation energy sequence and thermal stability. Moreover, due to the retention of aromatic rings in its monomers, PS almost completely converts into oil. Full article
(This article belongs to the Special Issue Thermochemical Conversion of Solid Fuels and Wastes)
►▼ Show Figures

Figure 1

19 pages, 3835 KiB  
Article
Semi-Analytical Modeling of Pyrolysis Front and Ignition Temperatures of Thermally Reactive Single Solid Particles
by Yousef Haseli
Processes 2023, 11(8), 2448; https://doi.org/10.3390/pr11082448 - 14 Aug 2023
Viewed by 613
Abstract
A semi-analytical approach is developed for predicting pyrolysis front temperature in a charring solid undergoing thermal decomposition. The pre-reaction heating stage is described using an analytical formulation and invoking the concept of thermal penetration depth. The solution for the solid conversion stage accounts [...] Read more.
A semi-analytical approach is developed for predicting pyrolysis front temperature in a charring solid undergoing thermal decomposition. The pre-reaction heating stage is described using an analytical formulation and invoking the concept of thermal penetration depth. The solution for the solid conversion stage accounts for decomposition enthalpy, the convective flow of volatiles, and a reaction front characterized by a uniform temperature that progresses toward the inner layers. This method incorporates empirical relations into the analytical model. Two scenarios are considered. First, the solution of the pyrolysis model combined with the data of conversion time versus external heat flux leads to an algebraic expression that reveals the existence of a maximum pyrolysis-front temperature. Explicit relations are derived for both the extremum pyrolysis temperature and optimum applied heat flux. In the second case, an expression is derived for the ignition temperature of a solid fuel (e.g., wood) by incorporating ignition delay time measurements into the heating stage model. The newly derived expression allows the ignition temperature to be described as a function of the Biot number and external heat flux. The relation obtained for the ignition temperature explains the experimental trends reported in some previous studies where two local extremums were observed for the ignition temperature in the absence of volatile reactions. Full article
(This article belongs to the Special Issue Thermochemical Conversion of Solid Fuels and Wastes)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-3
Back to TopTop