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Experimental and Simulation Study on Ventilation Heat and Humidity Damage in Deep Mining 深部采矿通风热湿损害试验与模拟研究
IF 0.8 4区 工程技术 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-09-26 DOI: 10.3103/S0361521924700307
Zongxiang Li, Yan Liu, Hongjie Zhang, Nan Jia

To study the problem of predicting and preventing high-temperature heat damage in deep mining of mines. The heat exchange and mass exchange algorithms of the ventilation network parting wind and surrounding rock are applied, and the model of the heat exchange coefficient of the wind flow in the drenching tunnel is adopted. TF1M3D simulation platform is developed by the College of Safety Science and Engineering of Liaoning Technical University. It is a dynamic disaster simulation software that visually and dynamically reflects the disaster spread and evolution in the ventilation system during the occurrence of major disasters in mines. Based on the theory of mass-energy active wind network, TF1M3D simulation platform can solve the problems of heat and humidity exchange, heat and mass transfer numerical calculation and so on.@Combined with the engineering example of Daqiang Mine, the algorithm is incorporated into the mine network domain system, and TF1M3D is used on the MATLAB platform to simulate and solve the temperature of the wind flow of the whole mine network domain system, and predict the temperature of the 0306 working face of Daqiang Coal Mine and put forward the simulation program of refrigeration cooling. The simulation results show that the maximum temperature of the future 3106 working face of Daqiang coal mine reaches 34.6°C, and the heat damage problem is serious. In the adopted cooling program, two refrigeration units are preferred to four refrigeration units, and the effective temperature control range of the two 250 kW refrigeration units is from 25 to 305 m, while the cooling meets the temperature of the working face airflow below 30°C. The results show that the method can accurately predict the temperature of the wind flow after cooling and the location of the cooling source, which provides a basis for the scientific development of the cooling program.

研究矿井深部开采高温热害预测与防治问题。应用通风网络分风与围岩的热量交换和质量交换算法,采用淋水巷道风流热交换系数模型。TF1M3D 仿真平台由辽宁工业大学安全科学与工程学院开发。它是一种动态灾害仿真软件,可直观、动态地反映矿井重大灾害发生时通风系统中灾害的扩散和演化过程。基于质能主动风网理论,TF1M3D仿真平台可解决热湿交换、传热传质数值计算等问题。@结合大强矿工程实例,将算法融入矿井网域系统,在MATLAB平台上利用TF1M3D对整个矿井网域系统的风流温度进行仿真求解,并对大强煤矿0306工作面的温度进行预测,提出了制冷降温的仿真方案。模拟结果表明,未来大强煤矿3106工作面最高温度达34.6℃,热害问题严重。在采用的降温方案中,两台制冷机组优于四台制冷机组,两台 250 kW 制冷机组的有效控温范围为 25 至 305 m,降温满足工作面风流温度低于 30℃。结果表明,该方法能准确预测降温后的风流温度和冷源位置,为科学制定降温方案提供了依据。
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引用次数: 0
Synthesis of Carbon–Carbon Composites Based on Anthracite of the Gorlovskii Basin 基于戈尔洛夫斯基盆地无烟煤的碳-碳复合材料的合成
IF 0.8 4区 工程技术 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-08-07 DOI: 10.3103/S0361521924700113
A. A. Vedyagin, I. V. Mishakov

The possibility of producing carbon–carbon composites by catalytic chemical vapor deposition has been investigated. Anthracite dust of deposits in the Gorlovskii basin was used as an initial carbon matrix. Salts of nickel acetate and iron oxalate were used to form catalytically active metal particles (nickel and iron) on the surface of anthracite. The precursor salts were supported by an incipient wetness impregnation of anthracite samples with aqueous solutions. Optimal conditions of thermal treatment in inert and reducing media were determined for the used salts. Scanning electron microscopy was used to study the secondary structures of the original anthracite with supported metals and synthesized carbon–carbon composites. Using the low-temperature nitrogen adsorption method, a significant increase in the specific surface area of an anthracite sample with supported nickel as a result of its treatment in an atmosphere of saturated C2–C4 hydrocarbons at 600°C was demonstrated.

摘要 研究了通过催化化学气相沉积生产碳-碳复合材料的可能性。戈尔洛夫斯基盆地矿床的无烟煤粉尘被用作初始碳基质。醋酸镍盐和草酸铁盐被用来在无烟煤表面形成具有催化活性的金属颗粒(镍和铁)。用水溶液对无烟煤样品进行初湿浸渍,以支持前驱盐。针对所用盐类,确定了在惰性和还原介质中进行热处理的最佳条件。扫描电子显微镜用于研究原始无烟煤与支持金属和合成碳-碳复合材料的二级结构。利用低温氮吸附法,证明了在 600°C 饱和 C2-C4 碳氢化合物气氛中处理有支撑镍的无烟煤样品后,其比表面积显著增加。
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引用次数: 0
Quantitative Characterization and Macromolecular Structure Model Construction of Taixi Anthracite as Raw Material of Coal-Based Activated Carbon 煤基活性炭原料太西无烟煤的定量表征与大分子结构模型构建
IF 0.8 4区 工程技术 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-08-07 DOI: 10.3103/S0361521924700204
Shanxin Xiong, Fengyan Lv, Nana Yang, Yukun Zhang, Xueni Zhao, Juanjuan Liu, Yangbo Xu, Chenxu Wang, Xiaoqin Wang, Zhen Li, Jianwei Xu

In this article, we mainly completed the related research on the establishment of organic macromolecular structure model of Taixi anthracite as coal-based activated carbon precursor. The understanding of coal macromolecular structure is of great significance to clean and materialized utilization of coal. In this paper, the aromatic structure, aliphatic structure and heteroatomic structure of Taixi anthracite were characterized by 13C-NMR, FTIR and XPS. The macromolecular structure of coal was modeled by linking polycyclic aromatic hydrocarbons through bridging bonds (–CH2–, –CH–) and attaching oxygen/nitrogen functional groups. The molecular formula was determined to be C222H119NO11. The 13C-NMR simulation curve of the two-dimensional macromolecular model was in good agreement with the experimental curve. Through molecular mechanics (MM) and molecular dynamics (MD) optimization, the bond elastic energy (EB) and Van der Waals energy (EVAN) decrease greatly, which mainly lead to the acquisition of the three-dimensional energy minimum conformation. In addition, the density simulation result of 3D structural model with periodic boundary conditions is 1.37 g/cm3. This is close to the measured density, which confirm that the 3D structure is reasonable. The establishment of this model helps to further understand Taixi anthracite, which is beneficial to guide the preparation of activated carbon from Taixi anthracite.

摘要 本文主要完成了太西无烟煤作为煤基活性炭前驱体的有机大分子结构模型建立的相关研究。了解煤的大分子结构对煤的清洁化、物化利用具有重要意义。本文利用 13C-NMR、FTIR 和 XPS 对太西无烟煤的芳香族结构、脂肪族结构和杂原子结构进行了表征。通过桥键(-CH2-、-CH-)连接多环芳烃,并附加氧/氮官能团,建立了煤的大分子结构模型。分子式被确定为 C222H119NO11。二维大分子模型的 13C-NMR 模拟曲线与实验曲线十分吻合。通过分子力学(MM)和分子动力学(MD)优化,键弹性能(EB)和范德华能(EVAN)大大降低,这主要导致了三维能量最小构象的获得。此外,在周期性边界条件下,三维结构模型的密度模拟结果为 1.37 g/cm3。这与实测密度接近,证实了三维结构的合理性。该模型的建立有助于进一步了解太西无烟煤,有利于指导太西无烟煤活性炭的制备。
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引用次数: 0
Improving Efficiency of Flotation for Tavantolgoi Coal after Interplay Combination Ultrasonic and Electrolysis 超声波和电解相结合提高塔万托勒盖煤的浮选效率
IF 0.8 4区 工程技术 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-08-07 DOI: 10.3103/S0361521924700198
Ariyasuren Purevdorj, Erdenechimeg Dolgor, Tugsuu Tserendorj

The Tavantolgoi coal deposit used in our study is one of the largest deposits and belongs to coking coal of the Permian age. Technical properties of each layer of coal in Ukhaa Khudag of the Tavantolgoi deposit were determined and compared. This study was carried out by selecting coal from layer 4C, which has the lowest calorific value of economically important layers. Sieve analysis of the coal samples was carried out to select the ultra-fine or ˂0.25 mm particle size fraction, and three different methods of flotation enrichment were conducted and compared. In this, conventional flotation, flotation after interplay of ultrasonic vibration and flotation after interplay combined with ultrasonic with electrolysis were carried out, respectively. As a result of the experiment, the best result was the coal concentrate with 6078k Cal/kg calorific value and 25.65% ash content of flotation after interplay of ultrasonic vibration combined with electrolysis. Therefore, we have determined the suitable experimental conditions for the further application of ultrasonic vibration in combination with electrolysis. We determined that the ultrasonic vibration time of 20 min, the amount of ethanol of 30 ml, and the electrolysis power of 1.5 A are suitable condition because the ash content of the floating concentration is the lowest, 24.1%, and the caloric content was the highest (6264 kcal/kg).

摘要 我们研究的塔万托勒盖煤矿是最大的煤矿之一,属于二叠纪炼焦煤。我们测定并比较了塔万托勒盖煤层中 Ukhaa Khudag 每一层煤的技术特性。这项研究选取了 4C 煤层的煤炭,该煤层在具有重要经济价值的煤层中热值最低。对煤样进行了筛分分析,以选出超细或˂0.25 毫米粒度的部分,并对三种不同的浮选富集方法进行了比较。其中,分别进行了常规浮选、超声波振动相互作用后浮选和超声波与电解相结合的相互作用后浮选。实验结果表明,超声波振动与电解相互影响后浮选的煤精矿热值为 6078kCal/kg,灰分含量为 25.65%。因此,我们确定了进一步应用超声波振动与电解相结合的合适实验条件。我们确定超声波振动时间为 20 分钟、乙醇量为 30 毫升、电解功率为 1.5 A 是合适的条件,因为浮选浓度的灰分含量最低,为 24.1%,热量含量最高(6264 千卡/千克)。
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引用次数: 0
Concentrations of Persistent Organochlorine Pollutants in Peatlands of the Arkhangelsk Oblast 阿尔汉格尔斯克州泥炭地中的持久性有机氯污染物浓度
IF 0.8 4区 工程技术 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-08-07 DOI: 10.3103/S0361521924700137
I. N. Zubov, S. B. Selyanina, A. V. Velyamidova, E. S. Kolpakova, A. S. Orlov

A study was conducted to assess the concentrations of persistent organochlorine pollutants (POPs) in high-moor peats of the Primorsky and Mezensky districts of the Arkhangelsk oblast. Peat deposits located in the zone of potential influence of pollutants and outside it were analyzed. Based on the results of chromatographic determination, data on the concentrations of some organochlorine compounds in the studied peats, in particular, persistent toxic hexachlorobenzene (HCB), pentachlorophenol (PCP), pentachloroanisole (PCA), and chlorinated phenols and their derivatives, were obtained. Target POPs were detected in all analyzed peat samples with noticeable variability in their concentrations across the study areas HCB (0.4–3.2 ng/g), PCP (0.2–1.8 ng/g), and PCA (up to 0.4 ng/g). The CP content of the studied peats varied over a wider range from 1.2 to 571 ng/g. The identified quantities of POPs (HCB, CP, and PCA) were most likely due to the entry of pollutants by atmospheric transport from various sources in the territories of nearby regions and neighboring states. The influence of local pollution sources associated with thermal processes should also be taken into account.

:

摘要 为评估阿尔汉格尔斯克州 Primorsky 和 Mezensky 地区高沼泥炭中持久性有机氯污染物 (POP) 的浓度,进行了一项研究。对位于污染物潜在影响区内和区外的泥炭沉积物进行了分析。根据色谱测定结果,获得了所研究泥炭中某些有机氯化合物的浓度数据,特别是持久性有毒物质六氯苯(HCB)、五氯苯酚(PCP)、五氯苯甲醚(PCA)和氯化酚及其衍生物。在所有分析的泥炭样本中都检测到了目标持久性有机污染物,但各研究区域的浓度存在明显差异:六氯苯(0.4-3.2 纳克/克)、五氯苯酚(0.2-1.8 纳克/克)和五氯苯甲醚(高达 0.4 纳克/克)。所研究泥炭中的氯化石蜡含量变化范围较大,从 1.2 到 571 纳克/克不等。已确定的持久性有机污染物(六氯苯、氯化石蜡和五氯苯甲醚)的数量很可能是由于污染物通过大气迁移从附近地区和邻近州境内的各种来源进入造成的。此外,还应考虑到与热过程有关的当地污染源的影响:
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引用次数: 0
Selective Hydrogenation of Carbon Oxides in the Presence of a Nickel-Containing Catalyst on a Secondary Biomass Substrate 含镍催化剂在二次生物质底物上选择性氢化氧化碳
IF 0.8 4区 工程技术 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-08-07 DOI: 10.3103/S0361521924700150
I. S. Chemakina, M. I. Ivantsov, A. V. Elyshev, M. V. Kulikova

A sample of a catalytic system based on nickel and a carbon-containing material, microcellulose, was obtained using a hydrothermal synthesis method. A catalytic study of the synthesized system in the process of selective hydrogenation of carbon monoxide and carbon dioxide was carried out with calculation of the apparent activation energy. The sample was demonstrated to be highly active in the selective hydrogenation reactions of carbon oxides. A 100% conversion of carbon monoxide and carbon dioxide and selectivity for methane of 90 and 80%, respectively, were obtained.

摘要 利用水热合成法获得了一种基于镍和含碳材料微纤维素的催化体系样品。通过计算表观活化能,对合成系统在一氧化碳和二氧化碳选择性氢化过程中的催化性能进行了研究。结果表明,该样品在碳氧化物的选择性氢化反应中具有很高的活性。一氧化碳和二氧化碳的转化率为 100%,对甲烷的选择性分别为 90% 和 80%。
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引用次数: 0
Rheological Characteristics of High Ash Indian Coal with Sodium Dodecyl Sulfate as Additive 添加了十二烷基硫酸钠的高灰分印度煤的流变特性
IF 0.8 4区 工程技术 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-08-07 DOI: 10.3103/S0361521924700216
Akash Pandey, Dulari Hansdah, Satish Kumar

The conveyance of coal in slurry form through pipelines has demonstrated its viability and efficacy, providing economic advantages, reliability and reduced environmental impact. As high-rank coal deposits are steadily depleting, researchers are interested in exploring ways to facilitate utilising low-rank coal to meet the global energy demand. However, the slurry prepared using low-rank coal exhibits high apparent viscosity and poor stability. In the present work, the rheological characteristics of Indian coal with an ash content of more than 50% are improved through the use of the commercial additive sodium dodecyl sulfate. The high ash coal sample’s physical, chemical, and morphological characteristics were assessed. The rheological attributes of the high ash coal slurry were investigated by altering the shear rate, solid loading, and additive concentration. The optimal sodium dodecyl sulfate proportion to obtain slurry with maximum stability and low apparent viscosity was found to be 0.5%. The observed rise in the absolute value of zeta potential from –37.82 to –52.19 mV signifies that suspension stabilization occurs via electrostatic repulsion. A statistical correlation for the prediction of slurry apparent viscosity was developed and proved to be promising and significant.

摘要 通过管道输送煤浆形式的煤炭已证明其可行性和有效性,具有经济优势、可靠性和减少对环境的影响。随着高阶煤储量的不断枯竭,研究人员希望探索如何促进低阶煤的利用,以满足全球能源需求。然而,使用低阶煤制备的煤浆表观粘度高,稳定性差。在本研究中,通过使用商业添加剂十二烷基硫酸钠,改善了灰分含量超过 50%的印度煤的流变特性。对高灰分煤样的物理、化学和形态特征进行了评估。通过改变剪切速率、固体负荷和添加剂浓度,研究了高灰分煤浆的流变属性。结果发现,要获得具有最大稳定性和较低表观粘度的煤浆,最佳的十二烷基硫酸钠比例为 0.5%。观察到 zeta 电位的绝对值从 -37.82 mV 上升到 -52.19 mV,这表明悬浮液的稳定是通过静电排斥作用实现的。为预测泥浆表观粘度而开发的统计相关性被证明是有前途和有意义的。
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引用次数: 0
Analysis of the Natural Hazard of the Mining Void Zone Based on Incomplete Collapse of the Roadway in the Return Mining 基于回采巷道不完全坍塌的采空区自然灾害分析
IF 0.8 4区 工程技术 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-08-07 DOI: 10.3103/S0361521924700228
Zongxiang Li, Wenshuo Sun, Dongjie Hu, Yuhang Li

Determining the risk of spontaneous combustion of coal remains in the airspace is crucial to the safe production of mines. Therefore, to investigate the danger of spontaneous combustion in the airspace when the overlying rock layer is not sufficiently compacted, the 1304 working face of Hongyang no. 2 Mine was taken as the research object. The experimental device was developed to measure the oxygen consumption rate, and the negative exponential function model was used to analyze the change rule of the oxygen volume fraction of the coal samples. Combined with a large amount of measured data of the working face and the change of the wind speed of the inlet and return tunnel, a CFD model of the ground without subsidence of the bubbling medium of the mining airspace was established, and numerical simulation was carried out on the flow field of the working face’s airspace area by using FLUENT software to get the oxygen volume fraction distribution law of the airspace area distribution law. The results show that the continuous oxygen consumption rate of the coal sample is γ = 9.3381 × 10–7 mol/(m3 s). Then, the oxygen volume fraction of choking (critical) under the actual temperature is 14.4%. The maximum range of the spontaneous combustion oxidation zone in the goaf is 25 to 176 m away from the working face. The work safety advancement rate is 1.86 m/d, and the actual advancement speed is 9.6 m/d, which also presents a lower risk of spontaneous combustion. The on-site test data matches well with the simulation results, which verifies the validity of the simulation and provides a basis for the prevention and control of spontaneous combustion of the coal left in the mining area to ensure the safe production of the mine.

摘要 确定采空区残煤自燃的危险性对矿井安全生产至关重要。因此,以红阳二矿1304工作面为研究对象,对上覆岩层不够密实时采空区煤炭自燃的危险性进行了研究。2 矿 1304 工作面作为研究对象。研制了测量耗氧率的实验装置,并利用负指数函数模型分析了煤样氧体积分数的变化规律。结合工作面大量实测数据和进、回风巷道风速变化情况,建立了采空区冒落介质地面无塌陷的 CFD 模型,并利用 FLUENT 软件对工作面采空区流场进行了数值模拟,得到了采空区面积分布规律的氧体积分数分布规律。结果表明,煤样的连续耗氧率为γ = 9.3381 × 10-7 mol/(m3 s)。则实际温度下窒息(临界)氧体积分数为 14.4%。煤层自燃氧化区的最大范围为距工作面 25 米至 176 米。工作安全推进速度为 1.86 m/d,实际推进速度为 9.6 m/d,自燃风险也较低。现场测试数据与模拟结果吻合良好,验证了模拟的有效性,为防治采空区留煤自燃,确保矿井安全生产提供了依据。
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引用次数: 0
Study on the Influence of Phase Change Process on the Desorption Characteristics of Gas-Containing Anthracite in Phase Change Heat Storage Materials 相变过程对相变蓄热材料中含气无烟煤解吸特性的影响研究
IF 0.8 4区 工程技术 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-08-07 DOI: 10.3103/S0361521924700186
Rui Zhou, Xianfeng Liu, Xueqi Jia, Baisheng Nie, Yankun Ma, Chuang Li

The slow desorption rate of coal body gas is easy to cause coal and gas outburst accidents, the temperature has an important influence on the desorption process of gas, and increasing the temperature can significantly improve the gas desorption rate. Based on this law, inorganic phase-change energy storage materials with a phase change temperature of 58°C were selected to study the influence range of the phase change process of materials with different contents on the temperature of coal body by comparative experiments. At the same time, the effect of the change of temperature on the desorption amount and desorption rate of gas desorption within coal was obtained by applying the phase change material to the adsorption/desorption experimental system. It was found that after the addition of the phase change material, the gas-containing coal which had completed the desorption process restarted to desorb the gas, and the final stabilized desorption amount was 1.709 cm3/g with an increase of 0.185 cm3/g, accounting for 12.14% of the desorption amount under normal conditions, which indicates that the addition of phase change materials can improve the desorption rate of coal samples.

摘 要 煤体瓦斯解吸速率慢易造成煤与瓦斯突出事故,温度对瓦斯解吸过程有重要影响,提高温度可显著提高瓦斯解吸速率。根据这一规律,选取相变温度为58℃的无机相变储能材料,通过对比实验研究不同含量材料相变过程对煤体温度的影响范围。同时,通过将相变材料应用于吸附/解吸实验系统,得到了温度变化对煤内气体解吸量和解吸速率的影响。结果发现,添加相变材料后,完成解吸过程的含气煤重新开始解吸气体,最终稳定的解吸量为 1.709 cm3/g,比正常条件下的解吸量增加了 0.185 cm3/g,占正常条件下解吸量的 12.14%,这表明添加相变材料可以提高煤样的解吸速率。
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引用次数: 0
The Influence of Pretreatment of Carbon Support on the Catalytic Activity of Fe–Cr Oxide Systems in the Oxidative Dehydrogenation of Ethane 碳支持物预处理对氧化铁-氧化铬体系在乙烷氧化脱氢过程中催化活性的影响
IF 0.8 4区 工程技术 Q4 CHEMISTRY, MULTIDISCIPLINARY Pub Date : 2024-08-07 DOI: 10.3103/S0361521924700149
I. I. Mishanin, T. V. Bogdan, V. I. Bogdan

The influence of alkaline and acid pretreatments of Sibunit carbon support on the catalytic properties of Fe–Cr/С oxide systems was studied for the process of oxidative dehydrogenation of ethane with CO2 in a temperature range of 650–750°C. It has been established that alkaline treatment promotes the active occurrence of the Boudoir–Bell reaction, while acid treatment slightly increases ethane conversion with greater carbonization of the catalyst surface.

摘要 研究了在 650-750°C 温度范围内乙烷与 CO2 的氧化脱氢过程中,碱性和酸性预处理 Sibunit 碳载体对 Fe-Cr/С 氧化物体系催化性能的影响。结果表明,碱性处理可促进布杜尔-贝尔反应的活跃发生,而酸性处理则会随着催化剂表面碳化程度的增加而略微提高乙烷的转化率。
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引用次数: 0
期刊
Solid Fuel Chemistry
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