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Advanced Clean Coal Technology
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Advanced Clean Coal Technology

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

Deadline for manuscript submissions: 5 August 2025 | Viewed by 1131

Special Issue Editor

Dr. Guoqiang Cao

E-Mail Website
Guest Editor
Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, China
Interests: coal gasification; coal pyrolysis; clean coal technology; heterogeneous catalysis; plasma catalysis

Special Issue Information

Dear Colleagues,

Coal is as an abundant natural worldwide resource and is a reliable source of primary energy mix for modern lifestyles. The utilization of coal in every aspect of human life releases more than 40% of energy-based CO2 emissions and causes serious environmental pollution. Clean coal technology represents advanced technologies such as processing, combustion, conversion, and pollution control, aimed at reducing pollution emissions and improving utilization efficiency throughout the process of coal development. Efforts to create advanced clean coal technology have been taken, and remarkable progress has been made in recent years. The goal of this Special Issue is to setup a platform for researchers to present their recent progress on clean coal technology-related topics. This Special Issue may also enhance the scientific and multi-disciplinary knowledge and visibility of correlated research. It is also expected to illuminate future research directions concerning advanced clean coal utilization. We therefore invite papers on innovative clean coal technologies in the form of reviews, research articles, and case studies. We invite all scholars interested in coal research to contribute their state-of-the-art research findings. The proposed sub-topics of this Special Issue cover, but are not limited to, the following:

  • Regional intelligent or advanced coal mining and processing technologies;
  • Advanced coal pyrolysis and gasification technologies;
  • Chemical and engineering basis of clean oil products from coal;
  • Clean coal combustion and utilization;
  • Smart and sustainable management and life cycle analysis on coal-based industries.

Dr. Guoqiang Cao
Guest Editor

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

  • coal
  • clean coal technologies
  • gasification
  • combustion
  • pyrolysis
  • hydrogenation
  • carbon dioxide capture and storage
  • life cycle analysis

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Published Papers (2 papers)

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Research

27 pages, 6070 KiB  
Article
The Effects of Water Immersion-Induced Softening and Anisotropy of Mechanical Properties on Gas Depletion in Underground Coal Mines
by Yuling Tan, Hanlei Zhang, Xiuling Chen, Qinghe Niu and Guanglei Cui
Energies 2025, 18(8), 2033; https://doi.org/10.3390/en18082033 - 16 Apr 2025
Viewed by 107
Abstract
Coalbed methane (CBM), a highly efficient and clean energy source with substantial reserves, holds significant development potential. Permeability is a crucial factor in CBM recovery in underground coal mines. Hydraulic fracturing technology causes water to enter the coal reservoir, which will change mechanical [...] Read more.
Coalbed methane (CBM), a highly efficient and clean energy source with substantial reserves, holds significant development potential. Permeability is a crucial factor in CBM recovery in underground coal mines. Hydraulic fracturing technology causes water to enter the coal reservoir, which will change mechanical properties, affecting permeability changes and gas depletion trends. This study combines theoretical analysis with numerical simulation techniques to create a coupling model for fluid flow and reservoir deformation. The numerical model is established by referring to the geological conditions of the Wangpo coal mine, Shanxi province. Specifically, the impact of water immersion-induced softening and changes in the anisotropic mechanical properties on the directional permeability and gas flow rate is examined through parametric analysis. The dominant role in controlling the evolution of permeability varies depending on the orientation. Horizontal deformation primarily affects vertical permeability, which is subsequently influenced by the gas adsorption effect. In contrast, horizontal permeability is mainly determined by vertical deformation. Water immersion-induced softening significantly reduces the permeability and gas flow rate. Young’s modulus, which is dependent on water saturation, alters the permeability trend under water-rich conditions. Vertical permeability evolution is more sensitive to water-induced softening and changes in the anisotropic mechanical properties. When Sw0 is 0.7, the vertical permeability decreases by 60%, while the horizontal permeability decreases by 43%. Ultimately, the vertical permeability ratio stabilizes between 0.9 and 1.0, while the horizontal permeability ratio stabilizes in the range of 0.6 to 0.7. The influence of permeability on gas production characteristics is dependent on the water saturation conditions. In water-scarce conditions, variations in the fracture permeability greatly influence production flow rates. Conversely, in water-rich conditions, a higher permeability facilitates a quicker return to original levels and also enhances gas production flow rates. The research findings from this study provide important insights for fully understanding the mechanical properties of coal and ensuring the sustainable production of CBM. Full article
(This article belongs to the Special Issue Advanced Clean Coal Technology)
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12 pages, 3509 KiB  
Article
A Novel Optical Instrument for On-Line Measurement of Particle Size Distribution—Application to Clean Coal Technologies
by Mao Cheng, Zachariah Wargel, Duarte Magalhaes and Richard Axelbaum
Energies 2025, 18(3), 720; https://doi.org/10.3390/en18030720 - 4 Feb 2025
Viewed by 596
Abstract
A flow cell is a critical measurement interface for many optical instruments. However, the flows are often sampled under harsh conditions, such as under high pressure and/or high temperature, in the presence of particles, moisture, vapors with high dew points or corrosive gases. [...] Read more.
A flow cell is a critical measurement interface for many optical instruments. However, the flows are often sampled under harsh conditions, such as under high pressure and/or high temperature, in the presence of particles, moisture, vapors with high dew points or corrosive gases. Therefore, obtaining a high-optical-quality flow cell that does not perturb the measurement is a significant challenge. To address this challenge, we proposed a new flow cell that employs a unique laminar coaxial flow field (for the purge and sample flows). A test system was built to conduct particle size distribution (PSD) measurements with no sampling bias using a state-of-the-art analyzer (Malvern Panalytical Insitec). The results revealed that the measurement zone is well defined solely by the sample flow, and the optical windows are well protected by the purge flow, with minimal risk of any depositions from the sample flow. Using this flow cell, the Insitec can successfully measure PSD under high pressure and temperature under moist, corrosive conditions without generating any sampling bias. Importantly, we successfully applied this flow cell for on-line PSD measurement for the flue gas of a 100 kWth pressurized oxy-coal combustor operating at 15 bara. Full article
(This article belongs to the Special Issue Advanced Clean Coal Technology)
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