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      Simulation on Harmful Gas Control by Balanced Pressure Ventilation in the Fully Mechanized Caving Face under Sealed Fire Area of Small Coal Mine

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          Abstract

          The harmful gas in the sealed fire area of a small coal mine rushes into the mining face of the lower coal seam, which restricts the efficient promotion of the working face. In this paper, based on the evolution law of caving coal rock dilatation coefficient, the characteristics of the heterogeneous distribution of permeability and voidage in goaf were obtained, and the mathematical model of gas migration in goaf is constructed. The numerical solution of gas migration in goaf under the sealed fire area of a small coal mine was realized by using the Free and Porous Media Flow module and the Transport of Dilute Matter in Porous Media module in COMSOL Multiphysics, and the corresponding measure was proposed. The results show that the fresh air flows into the goaf from both the inlet air roadway and the working face and then flows out from the upper corner. Driven by the air flow, the CO in the overlying sealed fire area of a small coal mine flows out from the upper corner of the working face, resulting in the CO overlimit. Due to the influence of air leakage and the CO overlimit in the working face, low oxygen occurs in the working face. According to the characteristics of gas emission, balanced pressure ventilation technology is proposed to control the low oxygen in the working face and the CO overlimit in the upper corner. It is found that the balanced pressure ventilation obviously increases the pressure of the working face, reduces the pressure difference between the two ends of the working face by 45.7–26.7%, and decreases the air leakage to the goaf in the upper corner of the inlet air roadway. The field application shows that the problems of low oxygen in the working face and a CO overlimit in the upper corner are effectively solved.

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          Experimental studies of spontaneous combustion and anaerobic cooling of coal

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            Study on the Characteristics of Coal Spontaneous Combustion during the Development and Decaying Processes

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              Coal spontaneous combustion and N2 suppression in triple goafs: A numerical simulation and experimental study

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                Author and article information

                Journal
                ACS Omega
                ACS Omega
                ao
                acsodf
                ACS Omega
                American Chemical Society
                2470-1343
                29 March 2024
                09 April 2024
                : 9
                : 14
                : 16168-16175
                Affiliations
                []College of Mining, Liaoning Technical University , Fuxin 123000, China
                Author notes
                Author information
                https://orcid.org/0000-0003-4578-0760
                https://orcid.org/0000-0003-0692-5832
                https://orcid.org/0000-0003-1006-7965
                Article
                10.1021/acsomega.3c10149
                11007828
                901e0fea-bb6a-448f-bc5e-7e0ae187f0a3
                © 2024 The Authors. Published by American Chemical Society

                Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works ( https://creativecommons.org/licenses/by-nc-nd/4.0/).

                History
                : 19 December 2023
                : 14 March 2024
                : 08 March 2024
                Funding
                Funded by: National Natural Science Foundation of China, doi 10.13039/501100001809;
                Award ID: 52004117
                Funded by: Liaoning Technical University, doi 10.13039/501100009015;
                Award ID: LNTU20TD-03
                Funded by: Henan Polytechnic University, doi 10.13039/501100003488;
                Award ID: SJF2205
                Funded by: China Postdoctoral Science Foundation, doi 10.13039/501100002858;
                Award ID: 2021T140290
                Funded by: China Postdoctoral Science Foundation, doi 10.13039/501100002858;
                Award ID: 2020M680975
                Funded by: National Natural Science Foundation of China, doi 10.13039/501100001809;
                Award ID: 52174117
                Funded by: National Natural Science Foundation of China, doi 10.13039/501100001809;
                Award ID: 52074146
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                ao3c10149
                ao3c10149

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