Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
6.2
3.0
Journals
Energies
Special Issues
Innovative Technology in Deep Coal Development
energies-logo
Submit to Energies Review for Energies Propose a Special Issue

Journal Menu

► Journal Menu

Journal Browser

► Journal Browser
share announcement

Innovative Technology in Deep Coal Development

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "H3: Fossil".

Deadline for manuscript submissions: closed (31 January 2023) | Viewed by 7640

Special Issue Editors

Prof. Dr. Hanpeng Wang

E-Mail Website
Guest Editor
School of Qilu Transportation, Shandong University, Jinan 250002, China
Interests: coal rock dynamic disaster; disaster causing mechanism; multi-field multiphase rock mechanics; physical simulation of geotechnical engineering; geotechnical test technology
Dr. Bing Zhang

E-Mail Website
Guest Editor
School of Qilu Transportation, Shandong University, Jinan 250002, China
Interests: coal rock dynamic disaster; multi field multiphase rock mechanics; physical simulation of geotechnical engineering; coal and gas outburst

Special Issue Information

Dear Colleagues, 

The Guest Editor is inviting submissions for a Special Issue of Energies on the subject of Innovative Technology in Deep Coal Development.

At present, shallow coal resources have been gradually exhausted, and the development of deep coal and its associated resources is one of the important directions for ensuring energy security. This Special Issue aims to provide an opportunity for researchers to present their recent work on the safe, green, and efficient development of deep coal and its associated resources.

The design problems of interest include, but are not limited to:

  • Physical and mechanical properties of deep coal；
  • Mine disaster prevention and safe coal mining;
  • Collaborative development of coal associated resources;
  • Co-mining of coal and gas;
  • Green development of coal resources;
  • Efficient utilization of coal energy;
  • Development and utilization of abandoned coal mines;
  • Coal mining and environmental protection;
  • Ecological restoration of coal mine subsidence area;
  • Deep coal fluidization mining technology;
  • Intelligent coal mining technology;
  • Coal mine power disaster prevention technology, such as rock burst, mine earthquake, or coal and gas outburst;
  • Stability and control technology of coal mine roadways;
  • Water retaining mining technology;

Prof. Dr. Hanpeng Wang
Dr. Bing Zhang
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

  • deep coal energy
  • mine disaster prevention
  • abandoned coal mines
  • coal environmental protection
  • fluidization mining
  • intelligent coal mining
  • coal mine roadway
  • water retaining mining
  • clean utilization of coal
  • coal mine support

Published Papers (5 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, 4307 KiB  
Article
Experimental Study on Pressure Relief Mechanism of Variable-Diameter Borehole and Energy Evolution Characteristics of the Surrounding Rock
by Yangyang Li, Rongwei Guo, Shichuan Zhang, Bing Chen, Haodong Yan, Wenhang Meng and Dan Zheng
Energies 2022, 15(18), 6596; https://doi.org/10.3390/en15186596 - 9 Sep 2022
Cited by 5 | Viewed by 1262
Abstract
Conventional borehole pressure relief can meet the requirements for preventing rock bursts, but it can also easily destroy the roadway, resulting in system support failure. Taking coal-like samples with boreholes as the research object, the pressure relief effects of the same-diameter boreholes and [...] Read more.
Conventional borehole pressure relief can meet the requirements for preventing rock bursts, but it can also easily destroy the roadway, resulting in system support failure. Taking coal-like samples with boreholes as the research object, the pressure relief effects of the same-diameter boreholes and variable-diameter boreholes are compared and analyzed by a uniaxial compression test. The joint pressure relief mechanism of the variable-diameter drilling hole is discussed. The experimental results show that the stress–strain curve of variable-diameter drilling sample occurred the phenomenon of pre-peak stress drop and post-peak stress plateau, which indicates that the variable-diameter drilling hole can enhance the plastic characteristics of coal-like samples. The borehole size dramatically influences the variation of various pressure relief indexes. The evolution law of AE counting the pre-peak and post-peak of borehole samples verified the abovementioned law. Variable-diameter drilling can enhance the plasticity of samples, weaken the brittleness and reduce the impact tendency. Under the maximum size of the variable-diameter drilling hole and the same-diameter drilling hole is same, the pressure relief effect is more significant. The results obtained in this paper can provide a new theoretical basis and technical guidance for borehole pressure relief and roadway support. Full article
(This article belongs to the Special Issue Innovative Technology in Deep Coal Development)
►▼ Show Figures

Figure 1

11 pages, 5840 KiB  
Article
Multidisciplinary Geophysical Investigations over Deep Coal-Bearing Strata: A Case Study in Yangjiazhangzi, Northeast China
by Kun Wang, Xinbo Ge, Jianguo Ning, Jing Li and Xueyu Zhao
Energies 2022, 15(15), 5689; https://doi.org/10.3390/en15155689 - 5 Aug 2022
Cited by 4 | Viewed by 1428
Abstract
With the majority of coal mines in uncovered and semi-covered coal strata now explored and developed, most of the undiscovered coal-bearing strata are concealed. Compared with expensive drilling, deep targets such as concealed coal-bearing strata can be more efficiently and cost-effectively discovered through [...] Read more.
With the majority of coal mines in uncovered and semi-covered coal strata now explored and developed, most of the undiscovered coal-bearing strata are concealed. Compared with expensive drilling, deep targets such as concealed coal-bearing strata can be more efficiently and cost-effectively discovered through geophysical methods. We designed an integrated geophysical exploration approach to detect coal-bearing strata in the Yangjiazhangzi (YJZZ) area. Large-scale magnetotellurics (MT) is used to describe the geological structure along with its profile through the YJZZ area. An aeromagnetic survey was used to delineate the spatial distribution characteristics of the YJZZ syncline, a coal-bearing prospect tectonic unit. Localized exploration with controlled-source audio magnetotellurics (CSAMT) and MT reveals coal-bearing targets for drilling. Drilling results verified the targets identified through the integrated geophysical approach. Coal-bearing strata in the Benxi formation, the Taiyuan formation, and the Shanxi formation of the Permo-Carboniferous age are found between 630 and 770 m. This case study demonstrates that the multidisciplinary geophysical strategy can provide reliable results and credible data interpretation for deep coal seam resources exploration. The findings of this study can provide reference for explorers to carry out their specific exploration cases. Full article
(This article belongs to the Special Issue Innovative Technology in Deep Coal Development)
►▼ Show Figures

Figure 1

15 pages, 13219 KiB  
Article
Distribution of Upper Paleozoic Coal Seams in the Southeastern Ordos Basin
by Yunwen Guan, Qijun Guo, Renhai Pu, Xiaoping Gao, Shuo Chen and Tianyu Ji
Energies 2022, 15(14), 5110; https://doi.org/10.3390/en15145110 - 13 Jul 2022
Cited by 3 | Viewed by 1357
Abstract
The Ordos Basin contains abundant coal resources in the Upper Paleozoic strata. They are shallowly buried or exposed in the periphery of the basin, forming recoverable coal mines and coalbed methane resources. For the deeply buried coal seams of the basin, however, due [...] Read more.
The Ordos Basin contains abundant coal resources in the Upper Paleozoic strata. They are shallowly buried or exposed in the periphery of the basin, forming recoverable coal mines and coalbed methane resources. For the deeply buried coal seams of the basin, however, due to complex changes and difficult mining, less attention was paid before. In recent years, with the exploitation of tight gas related to coal source rocks, a large amount of drilling and seismic data has been accumulated in the southeastern Ordos Basin, which makes it possible to study the distribution change and factors controlling Upper Paleozoic coal seams. Delineation of deep coal development and distribution is an important basis for coal, coalbed methane and related tight gas resources in the Upper Paleozoic. We use core, logging and seismic data to analyze the coal geophysics, thickness variation, paleotopography and sedimentary facies in the southeastern Ordos Basin. The lower part of the Shanxi Formation (Fm.) and the upper part of the Taiyuan Fm. in the southeastern part of the basin are characterized by low natural gamma ray, low density, high resistivity and high sonic logging values. As the coal velocity is very low and alternates with the high-velocity Taiyuan Fm. and Ordovician limestones, the two sets of coals below and above the Taiyuan limestones form an extremely strong-amplitude reflection in the seismic profile. The two sets of coals are cumulatively 1–10 m thick, averaging 2.4 m, and 4 m is the maximum induvial thickness. The individual coal seams thicker than 2 m cover an area of approximately 2500 km2, and the burial depths of the coal seam range from 2500 to 3000 m. The thick coal seams of the Taiyuan Fm. are mainly distributed proximally in the Ordovician paleokarst depression, while the Ordovician paleokarst depression without incised origin was deposited by distal coeval limestone rocks. There is a complementary relationship between the coal seams and the thickened zone of distributary channel sandstone in the Shanxi Fm. Full article
(This article belongs to the Special Issue Innovative Technology in Deep Coal Development)
►▼ Show Figures

Figure 1

15 pages, 1375 KiB  
Article
Investigation on Key Parameters of N2 Injection to Enhance Coal Seam Gas Drainage (N2-ECGD)
by Xin Yang, Gongda Wang, Mingqi Ni, Longyong Shu, Haoran Gong and Zhie Wang
Energies 2022, 15(14), 5064; https://doi.org/10.3390/en15145064 - 11 Jul 2022
Cited by 4 | Viewed by 1441
Abstract
Practice shows that CO2/N2-ECBM is an effective technology to enhance coalbed methane. However, there are few field tests in which the technology is applied to enhance the gas drainage in underground coal mines, and the effect is uncertain. In [...] Read more.
Practice shows that CO2/N2-ECBM is an effective technology to enhance coalbed methane. However, there are few field tests in which the technology is applied to enhance the gas drainage in underground coal mines, and the effect is uncertain. In this study, firstly, the reasons for the decrease of gas drainage efficiency in the exhaustion period were analyzed based on the theory of fluid mechanics. Secondly, the mechanism of N2 injection to enhance coal seam gas drainage (N2-ECGD) was discussed: with the gradual decrease of gas pressure in the drainage process, coal seam gas enters a low-pressure state, the driving force of flow is insufficient, and the drainage enters the exhaustion period. The nitrogen injection technology has triple effects of “promoting flow”, “increasing permeability” and “replacing”. Thirdly, the numerical simulations of the nitrogen pressure on drainage effect were carried out based on the fully coupled model. The results show that the higher the nitrogen pressure, the greater the displacement effect between injection and drainage boreholes, the larger the effective range. Finally, a field test of N2-ECGD was carried out in the Liu Zhuang coal mine in Huainan Coalfield, China. The results show that N2 injection can significantly enhance the gas flow rate and CH4 flow rate in the drainage boreholes, and the coal seam gas content decreased 39.73% during N2 injection, which is about 2.6–3.3 times that of the conventional drainage. The research results provide an important guidance for promoting the application of N2-ECGD in underground coal mines. Full article
(This article belongs to the Special Issue Innovative Technology in Deep Coal Development)
►▼ Show Figures

Figure 1

15 pages, 4025 KiB  
Article
Multi-Source Information Monitoring Test of Fractured Rock Mass Destruction Characteristics and Sensitivity Analysis of Precursor Phenomena
by Qinghe Zhang, Tianle Zheng, Xiaorui Wang and Zhiyuan Fang
Energies 2022, 15(2), 538; https://doi.org/10.3390/en15020538 - 12 Jan 2022
Cited by 3 | Viewed by 1444
Abstract
The accuracy of the monitoring information is particularly important for exploring fractured rock mass deformation and failure mechanisms and precursor characteristics. Appropriate monitoring methods can not only timely and effectively reflect the failure laws of fractured rock masses but also play an early [...] Read more.
The accuracy of the monitoring information is particularly important for exploring fractured rock mass deformation and failure mechanisms and precursor characteristics. Appropriate monitoring methods can not only timely and effectively reflect the failure laws of fractured rock masses but also play an early warning role. To explore more reasonable monitoring methods, uniaxial compression experiments and real-time non-destructive monitoring on prefabricated fractured rock specimens through DIC, AE, and IRT were conducted; the strain field, temperature field, ringing frequency, standard deviation, etc. were analyzed; and correlation between the three methods in the information of audience was explored. The results show the following. (1) The failure evolution process of fractured rock mass can be divided into four stages. DIC can detect the initiation and propagation of cracks near the fractures of the specimen at the earliest stages. (2) The order of occurrence of precursor phenomena in multi-source monitoring information is different, which is vertical strain field > shear strain field > horizontal strain field > temperature field > ringing times. (3) The dispersion degree of standard deviation of each field is obviously different; the infrared temperature field is greater, but the strain field and temperature field show the same trend. (4) There are obvious precursors before the specimen is on the verge of instability; acoustic emission detected two consecutive increases in the cumulative number of ringing before destruction, which means the most obvious precursors. The research results can provide a theoretical basis for the precursory information capture and damage early warning of the fractured rock mass destruction process. Full article
(This article belongs to the Special Issue Innovative Technology in Deep Coal Development)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-5
Back to TopTop