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Experimental and numerical simulation study on forced ventilation and dust removal of coal mine heading surface

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International Journal of Coal Science & Technology 2024年第1期11卷 204-220页

作者： Haotian Zheng bingyou jiang Haoyu Wang Yuannan Zheng Key Laboratory of Industrial Dust Prevention and Control&Occupational Health and Safety Ministry of EducationAnhui University of Science and TechnologyHuainan232001China Joint National-Local Engineering Research Centre for Safe and Precise Coal Mining Anhui University of Science and TechnologyHuainan232001China School of Safety Science and Engineering Anhui University of Science and TechnologyHuainan232001China

In order to study the problems of unreasonable airflow distribution and serious dust pollution in a heading surface,an experimental platform for forced ventilation and dust removal was built based on the similar *** the similar experiment and numerical simulation,the distribution of airflow field in the roadway and the spatial and temporal evolution of dust pollution under the conditions of forced ventilation were *** airflow field in the roadway can be divided into three zones:jet zone,vortex zone and reflux *** dust concentration gradually decreases from the head to the rear of the *** the forced ventilation conditions,there is a unilateral accumulation of dust,with higher dust concentrations away from the *** position of the equipment has an interception effect on the *** maximum error between the test value and the simulation result is 12.9%,which verifies the accuracy of the experimental *** research results can provide theoretical guidance for the application of dust removal technology in coal mine.

关键词： Heading surface Forced ventilation Airflow field Dust pollution

Experimental investigation on coal pore-fracture variation and fractal characteristics synergistically affected by solvents for improving clean gas extraction

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International Journal of Mining Science and Technology 2024年第3期34卷 413-425页

作者： Feilin Han Sheng Xue Chunshan Zheng Zhongwei Chen Guofu Li bingyou jiang Key Laboratory of Safe and Effective Coal Mining of Ministry of Education Anhui University of Science and TechnologyHuainan 232001China School of Safety Science and Engineering Anhui University of Science and TechnologyHuainan 232001China School of Mechanical and Mining Engineering University of QueenslandQLD 4072Australia State Key Laboratory of Coal and Coalbed Methane Co-Mining Jincheng 048012China

Chemical solvents instead of pure water being as hydraulic fracturing fluid could effectively increase permeability and improve clean methane extraction ***,pore-fracture variation features of lean coal synergistically affected by solvents have not been fully *** testing,nuclear magnetic resonance analysis,liquid phase mass spectrometry was adopted to comprehensively analyze pore-fracture change characteristics of lean coal treated by combined solvent(NMP and CS_(2)).Meanwhile,quantitative characterization of above changing properties was conducted using geometric fractal *** model between permeability,fractal dimension and porosity were *** indicate that the end face fractures of coal are well developed after CS2and combined solvent treatments,of which,end face box-counting fractal dimensions range from 1.1227 to *** decreases in ultrasonic longitudinal wave velocity of coal affected by NMP,CS_(2)and combined solvent are 2.700%,20.521%,22.454%,*** treatments could lead to increasing amount of both mesopores and *** ratio of fractal dimension Dsis 0.259%–2.159%,while permeability increases ratio of NMR ranges from 0.1904 to ***,combined solvent could dissolve coal polar and non-polar small molecules and expand flow *** could provide reference for solvent selection and parameter optimization of permeability-enhancement technology.

关键词： Clean gas extraction Chemical solvent Experimental investigation Fractal characteristics Pore fracture

Explosive characteristics of nanometer and micrometer aluminum-powder

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Mining Science and Technology 2011年第5期21卷 661-666页

作者： jiang bingyou Lin Baiquan Shi Shulei Zhu Chuanjie Li Wenxia Faculty of Safety Engineering China University of Mining ＆ Technology Xuzhou 221116 China State Key Laboratory of Coal Resources and Mine Safety China University of Mining ＆ Technology Xuzhou 221008 China School of Management Xuzhou Normal University Xuzhou 221009 China

The explosive characteristics of aluminum powder have great significance in preventing and controlling aluminum-dust explosion accidents, especially the nano-aluminum powder. The explosion characteristics of 100 nm and 75 μm aluminum powders were investigated by using a 20 L spherical explosion cavity and a horizontal pipe whose cross-section area is 80 mm × 80 mm and length is 8 m. The results show that the maximum explosion pressure and its rising rate of 100 nm aluminum powder gradually increase with increasing concentration of aluminum-powder at the beginning. When aluminum-powder concentration is I kg/m3, the maximum explosion pressure reaches its maximum, and then gradually decreases. While when the concentration is 1.25 kg/m3, the maximum rate of pressure rise obtains its maximum, and then decreases. After 100 nm aluminum powder is exploded in pipes, the peak overpressure of blast wave first decreases and then increases to the maximum at a distance of 298 cm from the ignition source, and then gradually decreases. The most violent concentration is about 0.4 kg/m3 which is lower than 0.8 kg/m3 of 75 μm aluminum powder, so 100 nm aluminum powders are more easily exploded. The change laws of maximum explosion pressure, maximum rate of pressure rise and blast-wave peak overpressure of 100 nm aluminum powders with concentration are similar to those of 75 ktm aluminum powders, but these values are much higher than 75 Bm aluminum powders under the same concentration, so the aluminum-powders explosion of 100 nm will produce more harms. In the process of production, storage and transportation of aluminum powder, some relevant preventive measures can be taken to reduce the loss caused by aluminum-dust explosion according to nano-aluminum dust.

关键词： Nano-aluminum powderExplosion pressureRate of pressure risePeak overpressure

Effectiveness of coal mine dust control:A new technique for preparation and efficacy of self-adaptive microcapsule suppressant

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International Journal of Mining Science and Technology 2022年第6期32卷 1181-1196页

作者： Bo Ren Liang Yuan Gang Zhou Shuailong Li Qunzhi Meng Kai Wang bingyou jiang Guofeng Yu School of Emergency Management and Safety Engineering China University of Mining and Technology–BeijingBeijing 100083China State Key Laboratory of Deep Coal Mining&Environment Protection Huainan Mining Group Co.LTD.Huainan 232001China Key Laboratory of Industrial Dust Control and Occupational Health Ministry of EducationAnhui University of Science and TechnologyHuainan 232001China College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China Department of Civil and Environmental Engineering University of AlbertaEdmonton T6G 2R3Canada

This study aims to make full use of the agricultural waste peanut shells to lower material costs and achieve cleaner production at the same *** nanofibrils(CNF)extracted from peanut shells were mixed with acrylic acid(AA)and dimethyl diallyl ammonium chloride(DMDAAC)to prepare a new type of capsule core(dust suppressant).Then,the self-adaptive AA-DM-CNF/CA microcapsules were prepared under the action of calcium *** infrared spectroscopy and X-ray diffraction analysis results suggest that AA,DMDAAC and CNF have experienced graft copolymerization which leads to the formation of an amorphous *** scanning electron microscopy analysis results demonstrate that the internal dust suppressant can expand and break the wall after absorbing water,featuring a self-adaptive ***,the laser particle size analysis results show that the microcapsules,inside which the encapsulated dust suppressant can be observed clearly,maintain a good *** product performance experimental results reveal that the capsule core and the capsule wall achieve synergistic dust suppression,thus lengthening the dust suppression *** product boasts good dust suppression,weather resistance,degradation and synergistic combustion ***,this study,as the first report on the development and analysis of dust-suppressing microcapsules,fills in the research gap on the reaction mechanism between dust-suppressing microcapsules and coal by MS *** proposed AA-DM-CNF/CA dust-suppressing microcapsules can effectively lower the dust concentration in the space and protect the physical and mental health of coal *** general,this research provides a new insight into the structure control and performance enhancement of dust *** the application range of microcapsules is of crucial economic and social benefits.

关键词： Waste peanut shell AA-DM-CNF/CA Self-adaptive Dust suppression microcapsule Molecular dynamics simulation

A numerical simulation of the influence initial temperature has on the propagation characteristics of, and safe distance from, a gas explosion

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International Journal of Mining Science and Technology 2012年第3期22卷 307-310页

作者： jiang bingyou Lin Baiquan Shi Shulei Zhu Chuanjie tiu Qian Zhai Cheng Faculty of Safety Engineering China University of Mining & Technology Xuzhou 221116 China State Key Laboratory of Coal Resources and Mine Safety China University of Mining & Technology Xuzhou 221008 China School of Management Jiangsu Normal University Xuzhou 221009 China

A model roadway with a cross-sectional area of 80 mm 80 mm and a length of 100 m was used to estimate the overpressure, the temperature, the density, and the combustion rate during an explosion. Auto-ReaGas software was used for the calculations and the initial temperatures were 248, 268, 308, or 328 K. The methaneair mixture had a fuel concentration of 9.5% and the tunnel had a filling ratio of 10%. The results show that the safe distance necessary to avoid harm from the shock wave increases with increasing initial temperature. The distance where the peak overpressure begins to rise, and where the maximum value occurs, increases as the initial temperature increases. These are almost linear functions of the initial temperature. At locations before shock wave attenuation has occurred increasing the initial temperature linearly increases the maximum temperature at each point following along the tunnel. At the same time, the peak overpressure, the maximum density, and the maximum combustion rate decrease linearly. How-ever, after the shock wave has attenuated the attenuation extent of the peak overpressure decreases with an increase in initial temperature. The influence of the initial temperature on the explosion propagation depends on the combined effects of inhibiting and enhancing factors. The research results can provide a theoretical guidance for gas explosion disaster relief and treatment in underground coal mines.

关键词： Initial temperatureGas explosionShock waveSafety distanceNumerical simulation

聚磷酸铵对聚乙烯粉尘爆炸特性及热解动力学影响研究

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化工学报 2023年第10期74卷 4352-4366页

作者：江丙友丁大伟苏明清鲁昆仑安徽理工大学工业粉尘防控与职业安全健康教育部重点实验室安徽淮南232001 中国安全生产科学研究院北京100012 安徽理工大学安全科学与工程学院安徽淮南232001

为了减小聚乙烯(PE)粉尘爆炸事故所带来的危害,使用20-L爆炸球以及自主搭建的粉尘爆燃火焰传播测试系统进行爆炸抑制实验,从爆炸压力行为和火焰传播行为探究了聚磷酸铵(APP)对PE粉尘的抑制特性。通过同步热分析仪分析了APP对PE粉尘热解... 详细信息

为了减小聚乙烯(PE)粉尘爆炸事故所带来的危害,使用20-L爆炸球以及自主搭建的粉尘爆燃火焰传播测试系统进行爆炸抑制实验,从爆炸压力行为和火焰传播行为探究了聚磷酸铵(APP)对PE粉尘的抑制特性。通过同步热分析仪分析了APP对PE粉尘热解特性的影响,采用Coats-Redfern方法计算了PE和APP-PE混合粉尘(I=1.0)在快速热解阶段的反应动力学参数,并结合爆炸产物探究了其抑制机理。结果表明:APP可有效降低PE粉尘的最大爆炸压力、最大爆炸压力上升速率以及火焰传播速度,当抑制比为1.0时,PE粉尘爆炸压力峰消失,标志着在该抑制比下被完全抑制。此外,通过分析热解动力学模型发现PE粉尘在快速热解阶段遵循A3模型,添加APP后遵循R2模型,其平均活化能分别为137.34 kJ/mol和228.52 kJ/mol,活化能的增加,说明APP的加入减缓了PE粉尘的氧化和热分解,表现出显著的抑制效果。研究结果可为防治PE粉尘爆炸提供理论依据和技术支撑。

关键词：粉体爆炸火焰传播聚乙烯聚磷酸铵热解特性动力学

高校创新创业教育成熟度评价模型构建及实证研究

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安徽理工大学学报（社会科学版） 2020年第6期22卷 103-108页

作者：江丙友安徽理工大学能源与安全学院安徽淮南232001

为了对高校创新创业教育进行科学合理地评价,为其提供持续提高的途径,引入能力成熟度概念,构建了高校创新创业教育成熟度模型,对成熟度进行五个等级的划分与定义,并基于该模型建立了高校创新创业教育成熟度评价指标体系。而后应用层次... 详细信息

为了对高校创新创业教育进行科学合理地评价,为其提供持续提高的途径,引入能力成熟度概念,构建了高校创新创业教育成熟度模型,对成熟度进行五个等级的划分与定义,并基于该模型建立了高校创新创业教育成熟度评价指标体系。而后应用层次分析法确定指标权重,应用物元可拓理论建立了评价模型。将该评价模型应用到某高校创新创业教育的评估,所得的评价结果与该高校实际相符,说明了评价模型有效合理。

关键词：创新创业教育成熟度物元可拓评价

基于大脑半球功能非对称理论对舍曲林联合重复经颅磁刺激治疗持续性躯体形式疼痛障碍的机制研究

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中国康复医学杂志 2018年第8期33卷 934-939页

作者：李柄佑姜贵云金荣疆郑重承德医学院附属医院康复医学科承德067000 成都中医药大学养生康复学院四川大学华西医院神经生物检测中心

目的:探讨大脑半球功能偏侧化与持续性躯体形式疼痛障碍的关系。方法:将37例持续性躯体形式疼痛障碍(PSPD)患者随机分为A、B两组,20例健康受试者设为C组。B组单纯给予舍曲林治疗,每次75mg,每晚1次,疗程6周。A组从开始观察第1天起,药物... 详细信息

目的:探讨大脑半球功能偏侧化与持续性躯体形式疼痛障碍的关系。方法:将37例持续性躯体形式疼痛障碍(PSPD)患者随机分为A、B两组,20例健康受试者设为C组。B组单纯给予舍曲林治疗,每次75mg,每晚1次,疗程6周。A组从开始观察第1天起,药物治疗同B组,并在服用药物的基础上联合重复经颅磁刺激(rTMS)治疗,每日治疗1次,连续治疗5次后,间隔2日,总共治疗15次。分析各组汉密尔顿抑郁量表(HAMD)、数字疼痛评分量表(NRS)及运动阈值(MT)变化,并进行分析比较。结果:PSPD患者双侧大脑半球MT值间比较无显著性差异(P>0.05),正常受试者右侧大脑半球MT值高于左侧大脑半球MT值(P0.05);经过3周、6周治疗后A组左侧大脑半球MT值降低(P<0.05),右侧大脑半球MT值升高(P<0.05);B组仅在治疗后6周右半球MT值降低。经过3周、6周治疗后,A、B两组HAMD、NRS评分均显著低于治疗前(P<0.001),且A组HAMD评分低于B组评分(P<0.05);治疗后3周A组NRS评分低于B组(P<0.05),治疗后6周A、B两组NRS评分无显著性差异。结论:大脑半球功能异常偏侧化可能对PSPD的发病产生重要影响;舍曲林及舍曲林联合rTMS均能缓解PSPD患者疼痛症状、改善PSPD患者的不良情绪,且后者优于前者。

关键词：持续性躯体形式疼痛障碍经颅磁刺激运动阈值

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瓦斯抽采钻孔动态密封黏液型材料实验研究

采矿与安全工程学报 2022年第5期39卷 1033-1040页

作者：张超延婧李树刚江丙友翟成倪冠华包若羽西安科技大学安全工程学院陕西西安710054 西部矿井开采及灾害防治教育部重点实验室陕西西安710054 中国矿业大学煤炭资源与安全开采国家重点实验室江苏徐州221116 应急管理部信息研究院北京100029

为解决动态密封方法中现有黏液材料无法有效封堵煤岩漏气通道的问题,本文对钠基膨润土进行了改性研究。以钠基膨润土为基料,选取黏合剂羧甲基纤维素钠(CMC)、保水剂聚丙烯酰胺(PAM)和表面活性剂脂肪酸甲酯磺酸钠(MES)作为添加剂,研制出... 详细信息

为解决动态密封方法中现有黏液材料无法有效封堵煤岩漏气通道的问题,本文对钠基膨润土进行了改性研究。以钠基膨润土为基料,选取黏合剂羧甲基纤维素钠(CMC)、保水剂聚丙烯酰胺(PAM)和表面活性剂脂肪酸甲酯磺酸钠(MES)作为添加剂,研制出一种能与煤壁紧密结合的动态密封黏液型材料。通过单因素实验分别考察了表面活性剂掺量、保水剂掺量及水料比的变化对材料黏度及流动性的影响,掌握了各因变量随自变量的变化趋势。在此实验基础上,根据正交实验原理设计了三因素三水平17组配比实验,对17组实验所得黏液的黏度进行了统计,根据30 min内所得材料黏度值进行拟合与回归性分析,得到了拟合二次回归方程。其次,通过方差分析、等高线分析及响应曲面分析判断出各因素交互性对实验结果的显著性,分析表明3因素显著性排序为:保水剂>水料比>表面活性剂。最后,利用Design-Expert软件得出黏液材料的最佳配比为:表面活性剂4%,保水剂0.8%,水料比10∶1。为验证动态密封黏液型材料的高效性,选取漳村煤矿进行现场实验,并对30天内瓦斯抽采数据进行统计分析。实验表明:试验孔瓦斯抽采浓度比传统黏液材料封孔提高了24.57%,瓦斯抽采时间延长了1.5倍,瓦斯抽采流量得到显著提升,达到了煤矿瓦斯高效抽采的目的。

关键词：瓦斯抽采动态密封黏液材料参数优化响应面分析法