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Featured Papers in Geo-Energy

A topical collection in Energies (ISSN 1996-1073). This collection belongs to the section "H: Geo-Energy".

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Editors


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Collection Editor
Department of Power Engineering National Research, Tomsk Polytechnic University, 634050 Tomsk, Russia
Interests: energy; fuels; ignition; combustion chemistry; environmental performance; gas emissions; waste-derived fuels; coal–water slurry; waste to energy; thermal engineering; mathematical modeling; heat and mass transfer
Special Issues, Collections and Topics in MDPI journals

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Collection Editor
GFZ German Research Centre for Geosciences, Fluid Systems Modelling, Telegrafenberg, 14473 Potsdam, Germany
Interests: geochemical water–rock interactions; coupled simulation of flow, heat, transport, chemical reactions, and deformation; CO2 storage in geological reservoirs; energy production from hydrogeothermal reservoirs; formation of ore deposits

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Collection Editor
Chemical Process & Energy Resources Institute, Centre for Research & Technology Hellas (CERTH),15125 Athens, Greece
Interests: energy storage and policy; hydrogen; carbon capture and stotage; geo-engineering; hydro-pump energy storage; nanomaterials; land reclamation; ultramafic rocks petrology; industrial minerals; critical raw materials
Special Issues, Collections and Topics in MDPI journals

Topical Collection Information

Dear Colleagues,

The demands to utilize the geological subsurface are increasing. In addition to traditional production of raw materials or groundwater extraction for drinking water supply, the subsurface will most likely also be used to implement policy objectives in the context of transition energy policies to renewables and georesources. These include, e.g., the use of geothermal energy, storage of energy from renewable sources, and possibly long-term storage of CO2 to reduce the release of greenhouse gases into the atmosphere. This Special Issue aims to answer the question of which contribution can be expected from the geological subsurface. The collection is focused on bringing together innovative developments, technologies, and solutions in the field of geoenergy for reservoir characterization, geomechanics, sequestration of carbon dioxide, geothermal, petroleum, coal, and natural gas.

Prof. Dr. Pavel A. Strizhak
Prof. Dr. Michael Kühn
Prof. Dr. Nikolaos Koukouzas
Collection Editors

Manuscript Submission Information

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Keywords

  • reservoir characterization and modeling
  • geomechanics for energy and the environment
  • sequestration of carbon dioxide
  • geothermal energy extraction
  • petroleum exploration and production
  • energy from coal formations
  • hydrogen storage

Published Papers (2 papers)

2022

20 pages, 2288 KiB  
Article
Prospects of Using Gas Hydrates in Power Plants
by Dmitrii Antonov, Olga Gaidukova, Galina Nyashina, Dmitrii Razumov and Pavel Strizhak
Energies 2022, 15(12), 4188; https://doi.org/10.3390/en15124188 - 7 Jun 2022
Cited by 5 | Viewed by 1492
Abstract
By adding water to fuels, several objectives are pursued, with the main ones being to stabilize combustion, minimize the anthropogenic gaseous emissions, homogenize and stabilize the fuel, as well as improve its fire and explosion safety. Water can be injected into the furnace [...] Read more.
By adding water to fuels, several objectives are pursued, with the main ones being to stabilize combustion, minimize the anthropogenic gaseous emissions, homogenize and stabilize the fuel, as well as improve its fire and explosion safety. Water can be injected into the furnace as droplets or vapor and introduced as part of fuel samples. Water often serves as a coupling or carrier medium for the delivery of the main fuel components. In this paper, we compare the combustion behaviors of high-potential slurry fuels and gas hydrates. We also analyze the contribution of in slurries and gas hydrates to the combustion process. The values of relative combustion efficiency indicators are determined for gas hydrates and slurry fuels. The conditions are identified in which these fuels can be burned effectively in power plants. The research findings can be used to rationalize the alternative ways of using water resources, i.e., gas hydrate powder and promising composite fuel droplets. The results can also help predict the conditions for the shortest possible ignition delay, as well as effective combustion of gas hydrates as the most environmentally friendly new-generation alternative fuel. Full article
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Graphical abstract

16 pages, 4470 KiB  
Article
Energy Evolution and Damage Mechanism of Fractured Sandstone with Different Angles
by Xinwei Li, Zhishu Yao, Xiaohu Liu and Xianwen Huang
Energies 2022, 15(4), 1518; https://doi.org/10.3390/en15041518 - 18 Feb 2022
Cited by 9 | Viewed by 1269
Abstract
To explore the influence of crack angle on the mechanical properties, energy evolution, and damage evolution of sandstone, uniaxial loading tests were conducted on sandstones with different crack angles. Through the stress–strain curve, the influence of the crack angle on the mechanical properties [...] Read more.
To explore the influence of crack angle on the mechanical properties, energy evolution, and damage evolution of sandstone, uniaxial loading tests were conducted on sandstones with different crack angles. Through the stress–strain curve, the influence of the crack angle on the mechanical properties was analyzed. Based on energy theories and principles, the influence of crack angle on the energy conversion mechanism was analyzed. Based on crack angle and dissipated energy, a damage model considering the initial damage to the fractured sandstones was established. The following conclusions were drawn: (1) The strength and elastic modulus of sandstone decrease with an increase in crack angle, and Poisson’s ratio increases with an increase in crack angle; prefabricated cracks affect the crack initiation position, and accelerate the formation of fracture surfaces. (2) The stress–strain curve was divided into compaction stage, elastic stage, yield stage, and failure stage. The larger the crack angle, the longer the yield stage and the shorter the failure stage. (3) At the peak point, the elastic energy, dissipated energy, and input energy of fractured sandstone always decrease with an increase in crack angle; the energy consumption ratio increases with an increase in crack angle; and the energy storage ratio decreases with an increase in crack angle. (4) The damage variable shows a trend of slow accumulation–steady accumulation–rapid accumulation; the crack angle affects the initial damage of the specimen, and the dissipated energy affects the variation trend of the damage variable. Full article
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