Archives of Mining Sciences最新文献_第6页

The Unipore and Bidisperse Diffusion Models for Methane in Hard Coal Solid Structures Related to the Conditions in the Upper Silesian Coal Basin 与上西里西亚煤盆地条件有关的硬煤固体结构中甲烷的单孔和双分散扩散模型

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2020.134136

J. Krawczyk

{"title":"The Unipore and Bidisperse Diffusion Models for Methane in Hard Coal Solid Structures Related to the Conditions in the Upper Silesian Coal Basin","authors":"J. Krawczyk","doi":"10.24425/ams.2020.134136","DOIUrl":"https://doi.org/10.24425/ams.2020.134136","url":null,"abstract":"The safety of mining operations in hard coal mines must be constantly developed and improved. There is ongoing multi-directional research focused at best recognition of the phenomenon associated with the properties of the coal-gas system and its connections with mining and geological conditions. This article presents the results of sorption experiments on coals from the Upper Silesian Coal Basin, which are characterized by varying degrees of coalification. One of the parameters that describes the kinetics of methane sorption, determining and providing valuable information about gas hazard and in particular the risk of gas and rock outbursts, is the effective diffusion coefficient De. It is derived from the solution of Fick’s second law using many simplifying assumptions. Among them is the assumption that the carbon matrix consists of only one type of pore – micropores. In fact, there are quite often at least two different mechanisms, which are connected to each other, related to the diffusion of methane from the microporous matrix and flows occurring in voids and macropores. This article presents both the unipore and bidisperse models and a set of comparisons which fit them to experimental curves for selected coals. For some samples the more complex bidisperse model gave much better results than the classic unipore one. The supremacy of the bidisperse model could be associated with the differences in the coal structure related to the coalification degree. Initial results justify further analyses on a wider set of coals using the methodology developed in this paper.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45284421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Caulking of Goafs Formed by Cave-in Mining and its Impact on Surface Subsidence in Hard Coal Mines 硬煤矿山采空区充填及其对地表沉降的影响

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2021.136694

A. Kowalski, T. Rutkowski

{"title":"Caulking of Goafs Formed by Cave-in Mining and its Impact on Surface Subsidence in Hard Coal Mines","authors":"A. Kowalski, T. Rutkowski","doi":"10.24425/ams.2021.136694","DOIUrl":"https://doi.org/10.24425/ams.2021.136694","url":null,"abstract":"The impact of caulking of goafs after mining exploitation of a hard coal seam with caving is expressed as the change in value of a a exploitation coefficient which, as defined, is the quotient of the maximum reduction in the surface height of a complete or incomplete trough to the thickness of the exploited seam. The basis for determining the value of the exploitation coefficient was geological and mining data combined with the results of the measurement of subsidence on the surface – measuring line 1222-1301 – of the ruda mine. There, mining was carried out between 2005 and 2019, with a transverse longwall system and the caulking of goafs. The research team used two methods to determine the impact of the caulking applied in the goafs on the value of the exploitation coefficient. in the first method the goafs are filled evenly along the whole longwall, and in the second method unevenly and on a quarterly basis. The determination of the values of the exploitation coefficients for selected measuring points was preceded by the determination of the parameters of the knothe-Budryk theory, which was further developed by J. Białek. The obtained dependencies are linear and the values of the correlation coefficients fall between –0.684 and –0.702, which should be considered satisfactory in terms of experimental data. it is possible to reduce the value of the exploitation coefficient by caulking the goafs by about 18%, when filling the goafs to 0.26% of the height of the active longwall.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45306889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

SAFE WORKING CONDITIONS IN HOT MINE ENVIRONMENT – THE ANALYSIS OF DIFFERENT INDICES 高温矿井环境下的安全工作条件——不同指标的分析

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/118889

J. Drenda, G. Pach, Z. Różański, P. Wrona, J. Sułkowski

{"title":"SAFE WORKING CONDITIONS IN HOT MINE ENVIRONMENT – THE ANALYSIS OF DIFFERENT INDICES","authors":"J. Drenda, G. Pach, Z. Różański, P. Wrona, J. Sułkowski","doi":"10.24425/118889","DOIUrl":"https://doi.org/10.24425/118889","url":null,"abstract":"The article presents the discussion and practical examples relating to the interpretation of the notion of safe working areas in hot environment based on various indices (American Effective Temperature (ATE), climate equivalent temperature (t zk ) and the Silesian temperature (TS)). The first, theoretical part includes an analysis of the allowable dry bulb temperatures in line with the threshold values for the specified indices in case of various relative humidity and airflow velocity values. Also, the variability of the studied allowable working areas was exhibited for hypothetical extreme cases (such as an airflow of 0 m/s or the relative humidity of φ = 0%) as well as for actual conditions registered in headings. The second part consisted in the analysis of the allowable full-time working conditions for two selected cases of driving roadways. The analysis was conducted for two indices applied in the first part and complemented with an appraisal considering the dry bulb temperature (t s ) and the wet kata thermometer units (K w ). It has been exhibited that while regulating the airflow and the dry bulb temperature in the heading, significant differences in the interpretations (ranges) of safe working areas occur depending on the index that is being used. The conducted works indicate that by applying air cooling in the heading (decreasing the psychrometric temperatures considering the thermodynamic process corresponding to sensible air cooling) or by increasing the airflow, the requirements of the microclimate indices are fulfilled in the following order: ATE, t zk , TS.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":"58 5","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41316044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Modelling of Limestone Calcination for Optimisation of Parallel Flow Regenerative Shaft Kiln (PFR), Case Study: Iran Alumina Plant 优化并流再生竖窑（PFR）的石灰石煅烧建模，案例研究：伊朗氧化铝厂

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2022.141454

{"title":"Modelling of Limestone Calcination for Optimisation of Parallel Flow Regenerative Shaft Kiln (PFR), Case Study: Iran Alumina Plant","authors":"","doi":"10.24425/ams.2022.141454","DOIUrl":"https://doi.org/10.24425/ams.2022.141454","url":null,"abstract":"to produce the lime required for the bayer process, two parallel flow regenerative shaft kilns (pFr) were used in the iran Alumina plant located in Jajarm, north Khorasan province, iran. in this study, the calcination conditions of limestone were modelled in a laboratory furnace by considering three factors of limestone size, temperature and calcination time using the box-behnken method. the calcination model of limestone was obtained using a quadratic equation. due to the importance of limestone dust in the performance of industrial kilns, conditions of calcification and its reactivity with water were examined at three temperature ranges of 800, 1000, and 1200°C, by two methods of titration and standard AStM C110. the results indicated a decrease in reactivity of lime relative to the increased temperature of calcination and the lack of forming the burnt lime particles that stick together (blocking). Finally, the ratio of input limestone (kg) to fuel (m 3 ) was reduced from 16.4 to 15.3 to increase the average temperature of the burning zone to 1000°C. Also, excess air was reduced from 40 to 20%. in this condition, the lime quality was increased by about 6% in the kilns.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47240472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

The Influence of Impurities and Fabrics on Mechanical Properties of Rock Salt for Underground Storage in Salt Caverns – a Review 杂质和织物对地下储盐岩盐力学性能的影响

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2021.137454

K. Cyran

{"title":"The Influence of Impurities and Fabrics on Mechanical Properties of Rock Salt for Underground Storage in Salt Caverns – a Review","authors":"K. Cyran","doi":"10.24425/ams.2021.137454","DOIUrl":"https://doi.org/10.24425/ams.2021.137454","url":null,"abstract":"Salt caverns are used for the storage of natural gas, LPG, oil, hydrogen, and compressed air due to rock salt advantageous mechanical and physical properties, large storage capacity, flexible operations scenario with high withdrawal and injection rates. the shortand long-term mechanical behaviour and properties of rock salt are influenced by mineral content and composition, structural and textural features (fabrics). Mineral composition and fabrics of rock salt result from the sedimentary environment and post sedimentary processes. the impurities in rock salt occur in form of interlayers, laminae and aggregates. the aggregates can be dispersed within the halite grains or at the boundary of halite grains. Mineral content, mineral composition of impurities and their occurrence form as well as halite grain size contribute to the high variability of rock salt mechanical properties. the rock or mineral impurities like claystone, mudstone, anhydrite, carnallite and sylvite are discussed. Moreover, the influence of micro fabrics (in micro-scale) like fluid inclusions or crystals of other minerals on rock salt mechanical performance is described. In this paper the mechanical properties and behaviour of rock salt and their relation to mineral composition and fabrics are summarised and discussed. the empirical determination of impurities and fabrics impact on deformation mechanism of rock salt, qualitative description and formulation of constative models will improve the evaluation and prediction of cavern stability by numerical modelling methods. Moreover, studying these relations may be useful in risk assessment and prediction of cavern storage capacity.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46511522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Regulation and Optimization of Air Quantity in a Mine Ventilation Network with Multiple Fans 矿井多风机通风网络风量调节与优化

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2022.140709

Jinmiao Wang, Mingtao Jia, Lin Bin, Liguan Wang, Deyun Zhong

{"title":"Regulation and Optimization of Air Quantity in a Mine Ventilation Network with Multiple Fans","authors":"Jinmiao Wang, Mingtao Jia, Lin Bin, Liguan Wang, Deyun Zhong","doi":"10.24425/ams.2022.140709","DOIUrl":"https://doi.org/10.24425/ams.2022.140709","url":null,"abstract":"the ventilation system in underground mine is an important guarantee for workers’ safety and environmental conditions. As the mining activities continue, the mine ventilation system is constantly changing. therefore, to ensure ventilation on demand, the mine ventilation network regulation and optimization are very important. in this paper, the path method based on graph theory is studied. however, the existing path algorithms do not meet the needs of actual mine ventilation regulation and optimization. therefore, in this paper, the path algorithm is optimized and improved from four aspects. First, based on the depth-first search algorithm, the independent path search algorithm is proposed to solve the problem of false paths in the independent path searched when there is a unidirectional circuit in the ventilation network. Secondly, the independent path calculation formula is amended to ensure that the number of the independent path for the ventilation network with a downcast and an upcast shaft, multi-downcast and multi-upcast shaft and unidirectional circuits is calculated accurately. thirdly, to avoid both an increase in the number of control points in the multi-fan ventilation network and disturbances in the airflow distribution by determining the reference path through all the independent paths, all the independent paths with the shared fan must be identified. Fourthly, the number and the position of the regulators in the ventilation network are determined and optimized, and the final optimization of air quantity regulation for the ventilation network is realized. the case study shows that this algorithm can effectively and accurately realize the regulation of air quantity of a multi-fan mine ventilation network.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48924490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

APPLICATIONS OF MAGNETOMETRIC SENSORS BASED ON AMORPHOUS MATERIALS IN DIAGNOSTICS OF WIRE ROPES 基于非晶材料的磁强传感器在钢丝绳诊断中的应用

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/118896

M. Roskosz, M. Witoś, S. Molski

引用次数: 7

Influence of Rheological Parameters of the Fore-Sudetic Monocline Plastic Rocks on the Process of Drilling Boreholes 地震前单斜塑性岩石流变参数对钻孔过程的影响

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/AMS.2019.128684

Dagmara Zeljaś, R. Rado, Iwona Kowalska-Kubsik, T. Śliwa, A. Jamrozik

{"title":"Influence of Rheological Parameters of the Fore-Sudetic Monocline Plastic Rocks on the Process of Drilling Boreholes","authors":"Dagmara Zeljaś, R. Rado, Iwona Kowalska-Kubsik, T. Śliwa, A. Jamrozik","doi":"10.24425/AMS.2019.128684","DOIUrl":"https://doi.org/10.24425/AMS.2019.128684","url":null,"abstract":"Plastic rocks can creep, therefore the knowledge of the rheological properties of the drilled formations is an important element of the drilling process and when choosing borehole designs. These properties of plastic formations also influence the way in which appropriate drilling technology and drilling mud properties are selected. The article presents the effect of basic rheological parameters of salt from the Fore-Sudetic Monocline deposit on the drilling of boreholes in the mining area of KGHM Polska Miedź, which in the future can be used as a good drilling practice to improve the safety and efficiency of drilling. The process of drilling in plastic rocks may be hindered. Salt is a plastic rock and in the analyzed rock mass it is deposited at a considerable depth. The caprock exerts big loads on it, beside the temperature in the deposit intensifies the rheological properties of the rock. The creep process causes that the borehole contracts, therefore the knowledge about the rheological properties of the drilled rock is very important for establishing the safe time in which the well may remain uncased. The paper is devoted to the influence of basic rheological parameters of salt bed in the Fore-Sudetic Monocline on the process of drilling of a borehole in the area of KGHM Polska Miedź as these data can be used in drilling practice in the future.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48776549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development and Application of an Experimental Device for Measuring Storage Coefficient in a Coal Mine Underground Reservoir 煤矿地下水库蓄水系数测试实验装置的研制与应用

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2019.129375

Beifang Wang, Keming Sun, B. Liang, Weiji Sun

引用次数: 5

Experimental and Theoretical Study on the Dynamic Ejection Process of a Rock Burst Under a Static Load 静载荷作用下冲击地压动态抛射过程的实验与理论研究

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2021.136691

Weiyu Zheng

引用次数: 0