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Jet Flame Characteristics of High-Temperature Gas-Solid Mixed Fuels

Journal of Thermal Science 2025年第02期 653-671页

作者： LU Yu FANG Neng LI Wei GUO Shuai WU Yujun HU Yujie REN Qiangqiang Institute of Engineering Thermophysics Chinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of coal co.version Institute of Engineering ThermophysicsChinese Academy of Sciences co.lege of coal Engineering Shanxi Datong University

Preheating co.bustion/gasification technology enables efficient and environmentally friendly utilization of coal resources,but the research on the flow and reaction characteristics of high-temperature gas-solid mixed fuels produced by the technology still needs to be further *** flame can intuitively show the jet,mixing and reaction of fuel and oxidant at the outlet of the ***,this study investigates the jet flame characteristics of high-temperature gas-solid mixed fuels on a self-designed test *** temperature and gas-solid mixing are the special features of the fuel in this study,which are different from other ***,we first qualitatively co.pare the jet flame characteristics of high-temperature gas-solid mixed fuel with traditional *** preliminary results indicate that high-temperature gas-solid mixed fuels exhibit higher reactivity and a faster reaction rate co.pared to pulverized *** a result,it shows different characteristics in flame shape,ignition delay and ignition *** jet flame shape of high-temperature gas-solid mixed fuels closely resembles that of the pulverized coal group co.bustion flame,displaying a co.tinuous cloud-like structure similar to the shape of a gas-fueled ***,the flame image does not show any significant ignition delay *** upon these results,this study also quantitatively analyzes the geometric parameters,temperature distribution and oscillation frequency of the high-temperature gas-solid mixed fuel jet flame under different seco.dary air equivalence ratios and primary air equivalence ratios,so that we can have a deeper understanding of the influence of operating parameters on the co.bustion/gasification process.

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Dynamic intelligent prediction approach for landslide displacement based on biological growth models and CNN-LSTM

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Journal of Mountain Science 2025年第1期22卷 71-88页

作者： WANG Ziqian FANG Xiangwei ZHANG Wengang WANG Luqi WANG Kai CHEN Chao School of Civil Engineering Chongqing UniversityChongqing 400045China Nanjiang Hydro-geology and Engineering Geology Team of Chongqing Geology mineral Bureau Chongqing 401147China China coal Technology and Engineering Chongqing Design and Research Institute(group)co. Ltd.Chongqing 400016China

Influenced by co.plex external factors,the displacement-time curve of reservoir landslides demonstrates both short-term and long-term diversity and dynamic *** is difficult for existing methods,including Regression models and Neural network models,to perform multi-characteristic co.pled displacement prediction because they fail to co.sider landslide creep *** paper integrates the creep characteristics of landslides with non-linear intelligent algorithms and proposes a dynamic intelligent landslide displacement prediction method based on a co.bination of the Biological Growth model(BG),co.volutional Neural Network(CNN),and Long ShortTerm Memory Network(LSTM).This prediction approach improves three different biological growth models,thereby effectively extracting landslide creep characteristic ***,it integrates external factors(rainfall and reservoir water level)to co.struct an internal and external co.prehensive dataset for data augmentation,which is input into the improved CNN-LSTM ***,harnessing the robust feature extraction capabilities and spatial translation invariance of CNN,the model autonomously captures short-term local fluctuation characteristics of landslide displacement,and co.bines LSTM's efficient handling of long-term nonlinear temporal data to improve prediction *** evaluation of the Liangshuijing landslide in the Three Gorges Reservoir Area indicates that BG-CNN-LSTM exhibits high prediction accuracy,excellent generalization capabilities when dealing with various types of *** research provides an innovative approach to achieving the whole-process,realtime,high-precision displacement predictions for multicharacteristic co.pled landslides.

关键词： Reservoir landslides Displacement prediction CNN LSTM Biological growth model

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Advancing the reco.ery of iron and rare earth elements from the solid waste at Bayan Obo

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International Journal of Mining Science and Technology 2025年第2期35卷 295-306页

作者： Na Zhao Qiang Zhang Hongwei Ma Yongsheng Sun Peng Gao Zhao Cao Zhenyue Zhang School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China mineral Processing Plant of Jinchuan group Nickel co.alt co. Ltd.Jinchang 737100China School of Mining and coal Engineering Inner Mongolia University of Science and TechnologyBaotou 014010China School of Chemistry and Environmental Engineering Wuhan Institute of TechnologyWuhan 430074China

The storage of solid waste in Bayan Obo has resulted in significant resource wastage and environmental *** this study,an efficient process was developed to reco.er iron and rare earth elements(REEs)from this waste by processes of hydrogen-based mineral phase transformation(HMPT),magnetic separation,and *** optimal HMPT co.ditions(525℃,12.5 min,and 30%H_(2)co.centration),an iron co.centrate with a TFe grade of 64.09%and a reco.ery of 95.33%was *** magnetic properties of the solid waste were greatly enhanced by HMPT,allowing the effective magnetic separation of iron *** optimization of the flotation process resulted in a REEs co.centrate with a rare earth oxide(REO)grade of 65%-70%and a REEs reco.ery of 60%-65%.Hematite was reduced to magnetite during HMPT,and bastnaesite was deco.posed to REEs oxides and fluorides,and the particle structure was significantly ***,changes in monazite,fluorite,and barite were minimal.

关键词： Hydrogen-based mineral phase transformation Flotation Reduction characteristics Microstructure evolution Surface chemistry

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Behaviors of overlying strata in extra-thick coal seams using top-coalcaving method

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第2期8卷 238-247页

作者： Bin Yu datong coal mine group co.pany Datong037003China

Accidents such as support failure and excessive deformation of roadways due to drastic changes in strata behaviors are frequently reported when mining the extra-thick coal seams Nos.3e5 in datong coal mine with top-coal caving method,which significantly hampers the mine's normal *** understand the mechanism of strata failure,this paper presented a structure evolution model with respect to strata *** the behaviors of strata overlying the extra-thick coal seams were studied with the co.bined method of theoretical analysis,physical simulation,and field *** results show that the key strata,which are usually thick-hard strata,play an important role in overlying movement and may influence the mining-induced strata behaviors in the working face using top-coal caving *** structural model of far-field key strata presents a 'masonry beam' type structure when'horizontal O-X' breakage type *** rotational motion of the block imposed radial co.pressive stress on the surrounding rock mass of the *** can induce excessive deformation of roadway near the ***,this paper proposed a pre-co.trol technology for the hard roof based on fracture holes and underground roof *** co.ld effectively reduce stress co.centration and release the accumulated energy of the strata,when mining underground coal resources with top-coal caving method.

关键词： Extra-thick coal seam datong mining area Large-space structure Near-and far-field strata Strata behavior Key strata

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Application of experimental modal analysis technique to structural design of linear vibrating screen

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Journal of coal Science & Engineering(China) 2004年第1期10卷 88-90页

作者：李文英米朝阳武望国熊诗波 Institute of Mechelectronic Engineering Taiyuan University of Technology Taiyuan 030024 China datong coal mine group co. LTD Datong 037003 China

A large model of the screen was mounted in the laboratory for studying its modal performance. The model is suspended with steel ropes. Modal test was carried out with artificially exciting by 500 g impacting hammer and 100 kg exciting force shaker respectively. Synthesis and co.rection of the modal parameters are obtained from both testing methods. Design faults of vibrating screen were determined based on the analy-sis and dynamic co.rection of structure approaches about the screen was put forward finally.

关键词： vibrating screen experimental modal analysis dynamic design

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Rock-breaking mechanism and experimental analysis of co.fined blasting of borehole surrounding rock

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International Journal of Mining Science and Technology 2017年第5期27卷 795-801页

作者： Liu Changyou Yang Jingxuan Yu Bin School of mines China University of Mining&TechnologyXuzhou 221116China datong coal mine group co.pany Datong 037003China

The rock-breaking mechanism and effect of co.fined blasting were analysed by blasting and impact dynamic mechanics, fluid dynamic mechanics, fracture mechanics as well as blasting experiment. The results showed that the fracturing of surrounding rock in co.fined blasting co.dition is the result of co.ction of rock pre-cracking by shock wave and stress wave and the co.tinuing expanding crackenhancement of co.fined medium, and the model of crack development of borehole surrounding rock in co.fined blasting co.dition was established. This study acquired the damage range of surrounding rock under the action of shock wave and stress wave, as well as the crack development characteristics of surrounding rock after the wedge-in co.fined medium into the crack space. Deep-hole co.fined blasting experiment on large rock showed that the high-efficient utilisation of in-hole explosive was achieved and the safety of rock blasting operation was ensured. Safe static rock-breaking under the action of high-efficient explosive blasting was achieved as well as the unification of super dynamic load of explosive blasting and static rock-breaking of water medium.

关键词： Shock wave co.fined medium Water-wedge action Crack development co.fined blasting

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Fluent-based numerical simulation of flow centrifugal fan

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Journal of coal Science & Engineering(China) 2011年第2期17卷 198-200页

作者： LI Xian-zhang Xuangang coal-electricity co. Ltd Datong Coal Mine Group Yuanpin 034114 China

Testing centrifugal fan flow field by physical laboratory is difficult because the testing system is co.plex and the workload is heavy, and the results observed by naked-eye deviates far from the actual value. To address this problem, the co.putational fluid dynamics software FLUENT was applied to establish three-dimensional model of the centrifugal fan. The numeral model was verified by co.paring simulation data to experimental data. The pressure centrifugal fan and the speed changes in distribution in centrifugal fan was simulated by co.putational fluid dynamics soft-ware FLUENT. The simulation results show that the gas flow velocity in the impeller increases with impeller radius increase. Static pressure gradually increases when gas from the fan access is imported through fan impeller leaving fans.

关键词： centrifugal fan numerical simulation flow field FLUENT software

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Stress distribution and surrounding rock co.trol of mining near to the overlying coal pillar in the working face

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International Journal of Mining Science and Technology 2019年第6期29卷 881-887页

作者： Rui Gao Bin Yu Xiangbin Meng Key Laboratory of Deep coal Resource Mining School of MinesMinistry of Education of ChinaChina University of Mining&TechnologyXuzhou 221116China datong coal mine group co.Ltd. Datong 037000China

The occurrence of overlying coal pillar(OCP)exerts a strong effect on the stress and strain distribution of the surrounding rock in the *** this paper,the stress distribution characteristics are analyzed via the numerical calculation with the acco.nt of OCP presence or *** addition,this study revealed the joint effect of side pressure relief area of the goaf and stress co.centration in OCP on the final stress ***,the rules of abutment stress distribution affected by three influencing factors,namely horizontal-vertical distances between OCP and working face and buried depth of OCP,are *** functional model linking the peak stress of surrounding rock with the above influencing factors is *** field application of the above results proved that the rib spalling and deformation of a 2.95 m-high and 5.66 m-wide roadway co.ld be efficiently co.trolled by rationally adjusting working states of the support,and adopting the hydraulic prop co.rdinated with the p type metal beam and anchor cable to strengthen the surrounding rock of working face and roadway,*** proposed measures are co.sidered appropriate to satisfy the safe operation requirements.

关键词： Overlying coal pillar(OCP) Stress distribution Influencing factors Surrounding rock co.trol

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Key technologies and equipment for a fully mechanized top-coal caving operation with a large mining height at ultra-thick coal seams

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International Journal of coal Science & Technology 2015年第2期2卷 97-162页

作者： Jinhua Wang Bin Yu Hongpu Kang Guofa Wang Debing Mao Yuntao Liang Pengfei Jiang China coal Technology & Engineering group Beijing 100013 China datong coal mine group co. Ltd. Datong 037003 China CCTEG Shenyang Research Institute Shenyang 110016China

Thick and ultra-thick coal seams are main coal seams for high production rate and high efficiency in Chinese coal mines, which acco.nts for 44 % of the total minable coal reserve. A fully mechanized top-coal caving mining method is a main underground coal extraction method for ultra-thick coal seams. The coal extraction technologies for coal seams less than 14 m thick were extensively used in China. However, for coal seams with thickness greater than 14 m, there have been no reported cases in the world for underground mechanical extraction with safe performance, high efficiency and high coal reco.ery ratio. To deal with this case, China coal Technology ＆ Engineering group, datong coal mine group, and other 15 organizations in China launched a fundamental and big project to develop coal mining technologies and equipment for coal seams with thicknesses greater than 14 m. After the co.pletion of the project, a coal extraction method was developed for top-coal caving with a large mining height, as well as a ground co.trol theory for ultra-thick coal seams. In addition, the mining technology for top-coal caving with a large mining height, the ground support technology for roadway in coal seams with a large cross-section, and the prevention and co.trol technology for gas and fire hazards were developed and applied. Furthermore, a hydraulic support with a mining height of 5.2 m, a shearer with high reliability, and auxiliary equipment were developed and manufactured. Practical implication on the technologies and equipment developed was successfully co.pleted at the No. 8105 coal face in the Tashan coal mine, datong, China. The major achievements of the project are summarized as follows： 1. A top-coal caving method for ultra-thick coal seams is proposed with a cutting height of 5 m and a top-coal caving height of 15 m. A structural mechanical model of overlying strata called cantilever beam-articulated rock beam is established. Based on the model, the load resistance of the

关键词： Ultra-thick coal seams Top-coal caving mining Large mining height Mining method - Mining equipment Roadway support Safety guarantee

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Research of database-based modeling for mining management system

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Journal of coal Science & Engineering(China) 2005年第1期11卷 98-101页

作者：武海峰金智新白希军 School of Eco.omy Shandong Institute of Business and Technology datong coal group co. Ltd

Put forward the method to co.struct the simulation model automatically with database-based automatic modeling(DBAM) for mining system. Designed the standard simulation model linked with some open cut Pautomobile dispatch system. Analyzed and finded out the law among them, and designed model maker to realize the automatic pro- gramming of the new model program.

关键词： automatic modeling DBAM standard model model maker

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