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Coal and rock dynamic disaster prevention and control technology in the large mining face of a deep outburst mine

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Frontiers of Earth Science 2023年第3期17卷 701-712页

作者： Jianguo ZHANG Man WANG Hongwei ZHOU Dongming ZHANG Beichen YU Chongyang WANG Yujie WANG State key laboratory of Coking Coal Exploitation and Comprehensive utilization China Pingmei Shenma Holding Group CO.LTDPingdingshan 467000China State key laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400030China School of resources and Safety Engineering Chongqing UniversityChongqing 400030China School of Energy and Mining Engineering China University of Mining and Technology(Beijing)Beijing 100083China

In this study, we systematically studied the occurrence regularity of in situ stress in the Pingdingshan mine. The critical criterion model of coal-rock destabilization was established based on the theoretical framework of fracture mechanics. Furthermore, we analyzed the coupling destabilization mechanism of in situ stress and gas and studied the influence of the variation between original rock stress and mining-induced stress on the critical criterion. Through field experiments and applications, we established a three-dimensional gas drainage technology system for areas with a large mining height and long work face. Based on our research, a demonstration project was developed for deep mine dynamic disaster control. The technical system included the arrangement and optimization of pre-drainage holes along the coal seam, technology, and optimization of gas drainage through the bottom drainage tunnel and upper corner, gas drainage technology through sieve tubes, and a two plugging with one injection under pressure sealing technology. The implementation of the demonstration project effectively reduced the gas content and pressure of the coal seam in the deep mine, and the project increased the critical strength of the instability and failure of coal and rock.

关键词： in-situ stress dynamic disaster critical criterion gas drainage

Heat transfer behaviors of some supercritical fluids: A review

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Chinese Journal of Aeronautics 2022年第1期35卷 290-306页

作者： Gongnan XIE Xiaoxiao XU Xianliang LEI Zhouhang LI Yong LI Bengt SUNDEN School of Marine Science and Technology Northwestern Poly technical UniversityXi'an 710072China key laboratory of Low-grade Energy utilization Technologies and Systems Chongqing UniversityChongqing 400044China State key laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China State key laboratory of Complex Nonferrous Metal resources Clean utilization Kunming University of Science and TechnologyKunming 650093China School of Mechanical Engineering Northwestern Polyteclwical UniversityXi'an 710072China Department of Energy Sciences Lund UniversitySE-22100 LundSweden

Supercritical fluids(e.g.,hydrocarbon fuels,water,carbon dioxide,and organic working medium,etc)have been recognized as working media to improve thermal efficiencies in power cycles and energy conversion,and have been used or selected as the working fluids in engineering fields such as aerospace,nuclear power,solar energy,refrigeration,geothermal energy,chemical technology,and so *** better understand the interesting characteristic or abnormal behaviors of supercritical fluids,most valuable research works(including experimental results and numerical studies)from domestic and abroad have been *** such,this paper presents a comprehensive review on heat transfer behaviors of some supercritical fluids in engineering *** review focuses on recently available articles published mainly from 2016 up to the present *** common problems(i.e.,heat transfer enhancement and heat transfer deterioration particularly for the supercritical hydrocarbon fuels)in the supercritical field are summarized and some perspectives on future prospects are also included.

关键词： Heat transfer behavior Supercritical fluids Thermo-physical property Turbulence model Working condition

Screening high-quality fetal bovine serum for porcine oocyte maturation in vitro

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Animal Models and Experimental Medicine 2019年第4期2卷 334-339页

作者： Xueqing Liu Qiaoli Lang Meng Wu Xiaoyan You Qiling He Ling Luo Zijia Liu Puying Xiao Nan Huang Xi Yang Liangpeng Ge chongqing Academy of Animal Sciences ChongqingChina key laboratory of Pig Industry Sciences Ministry of AgricultureChongqingChina key laboratory of Pig Industry Sciences ChongqingChina Technical Engineering Center for the Development and utilization of Medical Animal resources ChongqingChina

Fetal bovine serum(FBS) is widely used in cell cultures due to its high stability and easy access. It was also used as a substitute for porcine follicular fluid(PFF) in previous studies. However, FBS components are unclear, and the presence of FBS in culture media may introduce a variation from batch to batch. This study aimed to establish an effective method to screen FBS in place of PFF in the culture media for porcine oocytes in vitro. We screened FBS from different sources by using porcine fetal fibroblast cells. The effects of six FBS samples on porcine fetal fibroblast cell growth were tested via frozen cell survival assay, cell clone formation assay, cell growth curve, and cell passage activity assay. The best serum that we called GFBS(heat-inactivated FBS, cat. no. 10500-64;Gibco) showed a similar effect on the maturation and development of porcine oocytes to that of PFF and can be used as a good substitute for PFF. These results suggested that the porcine fetal fibroblast cell culture test can be used as a valuable method to screen FBS for porcine oocyte maturation and embryonic development in vitro.

关键词： fetal bovine serum maturation rate porcine oocytes

Microstructures and thermal properties of municipal solid waste incineration fly ash

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Journal of Central South University 2012年第3期19卷 855-862页

作者：刘元元王佳佳林祥王里奥钟山杨威 key laboratory of The Three Gorges Reservoir Region's Eco-environmental of Ministry of Education Chongqing University College of resources and Environmental Science Chongqing University College of Environment and resources Guangxi Normal University

To analyze the feasibility of utilization of thermal technology in fly ash treatment, thermal properties and microstructures of municipal solid waste incineration （MSW1） fly ash were studied by measuring the chemical element composition, specific surface area, pore sizes, functional groups, TEM image, mineralogy and DSC-TG curves of raw and sintered fly ash specimens. The results show that MSWI fly ash particles mostly have irregular shapes and non-typical pore structure, and the supersonic treatment improves the pore structure; MSWI fly ash consists of Such crystals as SiO2, CaSO4 and silica-aluminates, and some soluble salts like KCl and NaCl. During the sintering process, mineralogy changes largely and novel solid solutions are produced gradually with the rise of temperature. Therefore, the utilization of a proper thermal technology not only destructs those persistent organic toxicants but also stabilizes hazardous heavy metals in MSWI fly ash.

关键词： municipal solid waste incineration fly ash thermal treatment sintering microstructure

Low-field NMR application in the characterization of CO_(2)geological storage and utilization related to shale gas reservoirs:a brief review

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Frontiers of Earth Science 2023年第3期17卷 739-751页

作者： Zhaohui LU Ke LI Xingbing LIU Peng ZHAO Jun LIU National and Local Joint Engineering Research Center of Shale Gas Exploration and Development Chongqing Institute of Geology and Mineral ResourceChongqing 401120China key laboratory of Shale Gas Exploration(Ministry of Natural resources) Chongqing Institute of Geology and Mineral ResourcesChongqing 401120China MOE key laboratory of Deep Earth Science and Engineering Institute of New Energy and Low-Carbon TechnologySichuan UniversityChengdu 610065China State key laboratory of Coal Mine Disaster Dynamics and Control School of Resources and Safety EngineeringChongqing UniversityChongqing 400044China chongqing Institute of Geological Survey Chongqing 401122China

CO_(2)geological storage and utilization(CGSU)is considered a far-reaching technique to meet the demand of increasing energy supply and decreasing CO_(2)*** CGSUs related to shale gas reservoirs,experimental investigations have attracted variable methodologies,among which low-field NMR(LF-NMR)is a promising method and is playing an increasingly key role in reservoir ***,the application of this nondestructive,sensitive,and quick LF-NMR technique in characterizing CGSU behavior in shale gas reservoirs is ***,the basic principle of LF-NMR for 1H-fluid detection is introduced,which is the theoretical foundation of the reviewed achievements in this ***,the reviewed works are related to the LF-NMR-based measurements of CH_(4)adsorption capacity and the CO_(2)-CH_(4)interaction in shale,as well as the performance on CO_(2)sequestration and simultaneous enhanced gas recovery from ***,the reviewed achievements have exhibited a large potential for LF-NMR application in CGSUs related to shale gas reservoirs,although some limitations and deficiencies still need to be ***,some suggestions are proposed for a more responsible development of the LF-NMR ***,this review is helpful in promoting the expanding application of the LF-NMR technique in CGSU implementation in shale gas reservoirs.

关键词： CO_(2)/CH_(4)competitive adsorption shale gas reservoir CO_(2)geological storage gas recovery enhancement low-field NMR

Recent advances in kinetic and thermodynamic regulation of magnesium hydride for hydrogen storage

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Rare Metals 2023年第9期42卷 2906-2927页

作者： Hang Yang Zhao Ding Yu-Ting Li Shao-Yuan Li Ping-Keng Wu Quan-Hui Hou Yang Zheng Biao Gao Kai-Fu Huo Wen-Jia Du Leon L.Shaw The State key laboratory of Refractories and Metallurgy Institute of Advanced Materials and NanotechnologyWuhan University of Science and TechnologyWuhan430081China College of Materials Science and Engineering National Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing400044China State key laboratory of Complex Nonferrous Metal resources Clean utilization Faculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming650093China

Developing safer and more efficient hydrogen storage technology is a pivotal step to realizing the hydrogen economy. Owing to the lightweight, high hydrogen storage density and abundant reserves, MgH_(2) has been widely studied as one of the most promising solidstate hydrogen storage materials. However, defects such as stable thermodynamics, sluggish kinetics and rapid capacity decay have seriously hindered its practical application. This article reviews recent advances in catalyst doping and nanostructures for improved kinetic performance of MgH_(2)/Mg systems for hydrogen release/absorption, the tuning of their thermodynamic stability properties by alloying and reactant destabilization, and the dual thermodynamic and kinetic optimization of the MgH_(2)/Mg system achieved by nanoconfinement with in situ catalysis and ball milling with in situ aerosol spraying, aiming to open new perspectives for the scale-up of MgH_(2) for hydrogen storage applications.

关键词： Magnesium hydride Thermodynamics Kinetics Hydrogen storage

Cu-clusters nodes of 2D metal-organic frameworks as a cost-effective noble-metal-free cocatalyst with high atom-utilization efficiency for efficient photocatalytic hydrogen evolution

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Chinese Chemical Letters 2022年第6期33卷 3049-3052页

作者： Guangmei Jiang Xingyan Liu Huilong Jian Peng Lu Jinwu Bai Guizhi Zhang Wen Yun Siqi Li Youzhou He chongqing key laboratory of Catalysis and New Environmental Materials College of Environment and ResourcesChongqing Technology and Business UniversityChongqing 400067China State key Joint laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

Several 2D nanosheets of porphyrin MOFs with various transition-metal clusters as metal nodes were prepared via a simple solvothermal method to apply in the photocatalytic hydrogen evolution,in which the hydrogen production rate of the optimal NS-Cu was as high as 15.39 mmol g^(-1)h^(-1).A series of experimental technologies especially cyclic voltammetry(CV)and Mott-Schottky(M-S)had been adopted to investigate the charge-transfer property of photo-generated electron-hole pairs,it was found that the uniformly dispersed Cu-clusters nodes in the original 2D MOFs played a key role in the electron transfer process,that was,the photo-generated electron transferred from excited state eosin-Y to the Cu-clusters nodes for the efficient hydrogen *** excellent photocatalytic performance could be attributed to the reversible oxidation-–reduction process of Cu^(Ⅱ)/Cu^(Ⅰ),which had excellent electron-receiving and electron-outputting *** results provided a novel avenue to adapt the uniformly dispersed metal nodes in the original MOFs as cost-effective noble-metal-free cocatalysts with very high atomutilization efficiency to improve the photocatalytic hydrogen evolution performance in dye-sensitized system.

关键词： 2D nanosheets Photocatalytic hydrogen production Cu-clusters nodes Cu^(Ⅱ)/Cu^(Ⅰ) Cocatalysts

Effect of TiO2 on reduction behavior of Cr2O3 in CaO-SiO2-Al2O3-MgO-TiO2-Cr2O3 by carbon from Fe-C melt

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Journal of Iron and Steel Research International 2020年第10期27卷 1145-1152页

作者： Jun-yi Xiang Gui-shang Pei Wei Lv Bao-hua Li Gui-bao Qiu Xue-wei Lv College of Materials Science and Engineering Chongqing UniversityChongqing 400044China chongqing key laboratory of Vanadium-Titanium Metallurgy and Advanced Materials Chongqing UniversityChongqing 400044China

The chromium-bearing titanomagnetite ore will turn to be the important raw material for blast furnace process in Panxi area,*** reduction behavior of Cr2O3 between CaO-SiO2-Al2O3-TiO2-Cr2O3 and Fe-C systems was *** effect of TiO2 content in the slag system on the reduction of Cr2O3,TiO2,and SiO2 and the con sumption of C in hot metal was investigated by both theoretical calculation and physical *** theoretical calculation results reveal that higher reduction temperature promotes the reduction of Cr and Ti,while high basicity and TiO2 content have little influence on the reduction of chromium but significantly influence the reduction of *** smelting reduction experiment results show that the content of Cr in hot metal significantly in creases with extendi ng the reduction time and decreases with the increase in TiO2 ***,the content of Ti in hot metal significantly increases as the TiO2 increases,reaching 0.073,0.085,0.107,and 0.121 wt.%for 5,10,15,and 20 wt.%of TiO2 input,*** studies proved that the reduction of Cr2O3 was a first-order *** addition of TiO2 inhibited the reduction of Cr2O3 and resulted in the decrease in reaction rate constant.

关键词： Smelting reduction Titanomagnetite Blast furnace slag Chromium oxide Titanium oxide

Effect of titanium content on the precipitation behavior of carbon-saturated molten pig iron

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International Journal of Minerals,Metallurgy and Materials 2019年第4期26卷 483-492页

作者： Lei-zhang Gao Tong-xiang Ma Meng-jun Hu Zhi-ming Yan Xue-wei Lü Mei-long Hu College of Materials Science and Engineering Chongqing University chongqing key laboratory of Vanadium-Titanium Metallurgy and New Materials

The use of iron ores bearing titanium as a raw material is an effective measure to prevent hearth erosion and prolong the life of a blast furnace. In this research, the effect of titanium content on the precipitation behaviors of high-melting phases of carbon-saturated molten pig iron were studied by confocal scanning laser microscopy. The results showed that, when the titanium content was less than 0.25 wt%,Fe_3C was precipitated as a single phase from the molten carbon-saturated iron. The growth rate of the precipitated Fe_3C crystals was very high, reaching 7387 μm^2/s. When the titanium content in the molten pig iron was greater than 0.47 wt%, TiC crystals precipitated first. The shape and size of the precipitated TiC crystals did not obviously change. After TiC was precipitated, the fluidity of the molten pig iron worsened. With a decrease in temperature, Fe_3C was also precipitated but the growth rate of Fe_3C was limited by the presence of the first precipitated TiC phase. The crystal size of the precipitated Fe_3C was much smaller than that of pure Fe_3C.

关键词： carbon-saturated molten pig iron precipitation behavior titanium titanium carbide confocal scanning laser microscopy