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Articles 49591 - 49620 of 196917

Full-Text Articles in Engineering

Ethinylation Reactions Of Some Aldehydes In The Presence Of Phenylacetylene Using High-Base Catalytic Systems, Abdurakhmanova Saida, Ikramov Abduvaxab, Ziyadullayev Odiljon, Ablakulov Lochin Feb 2021

Ethinylation Reactions Of Some Aldehydes In The Presence Of Phenylacetylene Using High-Base Catalytic Systems, Abdurakhmanova Saida, Ikramov Abduvaxab, Ziyadullayev Odiljon, Ablakulov Lochin

CHEMISTRY AND CHEMICAL ENGINEERING

The aim of the research work is the development of synthesis methods of aromatic acetylene alcohols and their various derivatives using different catalytic systems and also, determining their structure, physico-chemical and biological properties. The most effective way of synthesizing AAA is determined using selected complex catalytic systems and also, the range of catalytic activity of used catalysts is created. Acetic aldehyde, benzaldehyde and cyclohexonal, high-base catalytic systems − MOH/ДМСО∙H2O and M2CO3/ДMСO∙H2O with phenylacetylene reaction of enantioselective etynilation were investiged. Efficiency and course of chemical reaction in the process of formation acetylene alcohol affection of temperature, reaction duration, solvents, catalysts and …

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Synthesis Of Meta-Altered Arylmaleinamide And Preparation Of Esters In Their Presence, Turaeva Khurshida, Yuldasheva Mukhabbat, Khaydarova Sadokat Feb 2021

Synthesis Of Meta-Altered Arylmaleinamide And Preparation Of Esters In Their Presence, Turaeva Khurshida, Yuldasheva Mukhabbat, Khaydarova Sadokat

CHEMISTRY AND CHEMICAL ENGINEERING

The development of new methods of synthesis using cheaper reagents for the preparation of maleic acid derivatives, the study of chemical properties and the determination of new directions for the practical application of maleic acid derivatives are still relevant. Therefore, the development of this work is an urgent task. The aim of this study was to obtain the synthesis of monomaleinamide compounds under various conditions to obtain arylmaleimide derivatives of maleic acid and to transfer them in a pure state for further reactions. In this study, scientific studies were carried out to find convenient methods for the preparation of monoamide …

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Development Of Preparations Based On Local Components For Dust Suppression On Quarry Roads, Olikulov Fakhriyor, Mukhiddinov Bakhоdir, Vapoev Khusniddin, Zhurayev Shokhruh Feb 2021

Development Of Preparations Based On Local Components For Dust Suppression On Quarry Roads, Olikulov Fakhriyor, Mukhiddinov Bakhоdir, Vapoev Khusniddin, Zhurayev Shokhruh

CHEMISTRY AND CHEMICAL ENGINEERING

The aim of the work is to develop dust-collecting preparations based on local raw materials for the suppression of man-made dust formed on quarry paths. For this purpose, 4 types of the drug were created in the laboratory on the basis of domestic raw materials for dust suppression. The dependence of the viscosity and density of the created preparations on the concentration of components and temperature is studied. For the preparation of the solution of the created drug, a semi-industrial installation is created, which presents the general view and the process of preparing the solution. The spray of the prepared …

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Synthesis And Research Of Chelate Forming Sorbent Based On Carbamide, Formaldehyde, Ditizone, Chorieva Nigora, Ermuratova Nilufar, Turaev Khayit, Kasimov Sherzod Feb 2021

Synthesis And Research Of Chelate Forming Sorbent Based On Carbamide, Formaldehyde, Ditizone, Chorieva Nigora, Ermuratova Nilufar, Turaev Khayit, Kasimov Sherzod

CHEMISTRY AND CHEMICAL ENGINEERING

The purpose of this study is the synthesis and study of a chelating sorbent for the extraction of ions of non-ferrous and noble metals. To achieve this goal, a sulfur-containing chelating sorbent based on carbamide, formaldehyde, and dithizone was synthesized and studied. The optimal conditions for the synthesis of the sorbent have been determined and studies have been carried out on the influence of the molar ratios of the starting materials on the composition, and physicochemical properties of the synthesized sorbent. The optimum temperature of polycondensation was taken as 90 °C, the reaction time is 2.5-3 hours, as a result, …

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Synthesis And Spectroscopic Study Of Complex Compounds Of Mn(Ii), Co(Ii), Ni(Ii), Cu(Ii) And Zn(Ii) Acetates With 2-Aminobenzimidazole, Gapurova Lobar, Kadirova Shakhnoza, Rakhmonоva Dilnoza, Olimova Manzura Feb 2021

Synthesis And Spectroscopic Study Of Complex Compounds Of Mn(Ii), Co(Ii), Ni(Ii), Cu(Ii) And Zn(Ii) Acetates With 2-Aminobenzimidazole, Gapurova Lobar, Kadirova Shakhnoza, Rakhmonоva Dilnoza, Olimova Manzura

CHEMISTRY AND CHEMICAL ENGINEERING

The aim of the work is to develop a synthesis procedure and obtain new complex compounds of transition metal acetates with 2-aminobenzimidazole (L), to study the composition and structure of the synthesized compounds by elemental, thermal, X-ray phase analysis and IR spectroscopy. A procedure for the synthesis of new complex compounds of Mn(II), Cо(II), Ni(II), Cu(II) and Zn acetates with 2-aminobenzimidazole was developed and the composition and structure of the synthesized complex compounds were studied using modern physicochemical methods. Coordination competing donor centers, electronic and geometric structures of the ligand molecule were studied on the basis of a quantum-chemical calculation …

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Effect Of Light On The Resistance Of Bi/Pb Superconductors Synthesized By Solar Energy, Gulamova Dilbara, Echonkulov Elyor, Jalilov Dilshod, Bobokulov Sirojiddin Feb 2021

Effect Of Light On The Resistance Of Bi/Pb Superconductors Synthesized By Solar Energy, Gulamova Dilbara, Echonkulov Elyor, Jalilov Dilshod, Bobokulov Sirojiddin

CHEMISTRY AND CHEMICAL ENGINEERING

The aim of the work is to expand the capabilities of solar technologies and areas of practical use of superconductors. The effect of white light on the interaction of superconducting ceramics with a magnet at room temperature was investigated. It has been established that the magnet is “ejected” by ceramic samples of nominal Bi1,7Pb0,3Sr2Ca(n-1)CunOy, (n = 5-20) under the influence of white light and there is no effect in the dark. The resistance of Bi/Pb superconducting ceramics is reduced by exposure to light compared to resistance in the dark. The resistance of ceramics containing higher superconducting higher superconducting phases Tc …

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Spectrophotometric Color Determination Of Ceramic Pigments For Construction Ceramics And Regional Innovation System, Kadyrova Dilorom, Mansurov Yulbarskhon, Abdusattarov Shakirjan Feb 2021

Spectrophotometric Color Determination Of Ceramic Pigments For Construction Ceramics And Regional Innovation System, Kadyrova Dilorom, Mansurov Yulbarskhon, Abdusattarov Shakirjan

CHEMISTRY AND CHEMICAL ENGINEERING

The purpose of this work is the spectrophotometric determination of the color of ceramic pigments for the development of technology for the production of high-quality ceramic paints of a wide color palette for decorating building ceramics, porcelain and faience products. In this regard, using the principles of heterovalent isomorphic substitution of atoms in crystals, the compositions of ceramic pigments were designed on the basis of the anorthite derivatives containing transition elements with the general formula Са1-хMexAl2+xSi2-xО8, where calcium and silicon ions were replaced by aluminum and transition element, Ме – Cо, Ni, Fe, Cr. The color characteristics were taken on …

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Construction And Application Of Remote Service Cloud Platform For Mine Water Hazard Prevention And Control, Wang Hao, Dong Shuning, Qiao Wei, Ji Yadong, Zhu Kaipeng, Zhou Zhenfang, Ning Dianyan, Shang Hongbo Feb 2021

Construction And Application Of Remote Service Cloud Platform For Mine Water Hazard Prevention And Control, Wang Hao, Dong Shuning, Qiao Wei, Ji Yadong, Zhu Kaipeng, Zhou Zhenfang, Ning Dianyan, Shang Hongbo

Coal Geology & Exploration

Coal mine water disaster restricts the safe and efficient development of coal resources seriously. Aiming at the typical problems of roof, floor and goaf mine water disaster at present, three aspects of mine water prevention and control in China has been carried out including water hazard assessment, water inflow prediction, water hazard early warning, and water hazard detection and control, etc. However, the intelligence of these prevention and control work is relatively low. In order to solve this problem, this paper developed a multi-data fusion remote service cloud platform for mine water disaster prevention and control combining with the integration …

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Table Of Contents, The Editors Feb 2021

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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The Evolution Difference Of Macromolecular Structures And Its Dynamic Mechanism Of Coal Macerals：Research Status And Prospect, Cao Daiyong, Wei Yingchun, Wang Anmin, Wang Lu, Liu Zhifei, Qin Rongfang, Shu Zhenyu, Chen Gaojian Feb 2021

The Evolution Difference Of Macromolecular Structures And Its Dynamic Mechanism Of Coal Macerals：Research Status And Prospect, Cao Daiyong, Wei Yingchun, Wang Anmin, Wang Lu, Liu Zhifei, Qin Rongfang, Shu Zhenyu, Chen Gaojian

Coal Geology & Exploration

The physical and chemical properties of macerals are important factors affecting the clean and efficient utilization of coal and the physical properties of coal reservoirs. It has been recognized that the essential cause of determining the properties of macerals lies in their macromolecular structure. In order to reveal the evolution characteristics of macromolecular structure of macerals and its controlling factors, the research progresses at home and abroad were summarized and the shortcomings were analyzed from several aspects, such as the chemical and physical structure of macromolecules, the tectonic stress effect on the macromolecular evolution, and the evolution characteristics of macromolecules …

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Review On Carbon Neutralization Associated With Coal Geology, Sang Shuxun, Wang Ran, Zhou Xiaozhi, Huang Huazhou, Liu Shiqi, Han Sijie Feb 2021

Review On Carbon Neutralization Associated With Coal Geology, Sang Shuxun, Wang Ran, Zhou Xiaozhi, Huang Huazhou, Liu Shiqi, Han Sijie

Coal Geology & Exploration

Coal-based carbon emissions constitute the largest part of China's total carbon emissions. Reducing coal-based carbon emissions and realizing the efficient, clean and low-carbon utilization of coal are the important ways to achieve the goal of "carbon neutralization". This paper systematically reviews the research fields of coal geology related to carbon neutralization, analyzes the role and application prospects of coal geology in carbon neutrality research and engineering practice, and discusses the development direction of coal geology in the context of carbon neutralization. The following understandings are obtained. Promoting clean coal geology research to advance the efficient and clean combustion of coal. …

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Technologies And Prospect Of Geological Guarantee For Intelligent Coal Mining, Dong Shuning, Liu Zaibin, Cheng Jianyuan, Chen Baohui, Dai Zhenhua, Li Dan Feb 2021

Technologies And Prospect Of Geological Guarantee For Intelligent Coal Mining, Dong Shuning, Liu Zaibin, Cheng Jianyuan, Chen Baohui, Dai Zhenhua, Li Dan

Coal Geology & Exploration

Intelligent coal mining is the strategic selection of the coal industry under the new round of technological change. It is the way that must get through to achieve efficient production of coal mine safety. Geological guarantee technologies can provide accurate and reliable geological data for intelligent coal mining. Moreover, it could reduce the occurrence of coal mine production disasters and accidents by effectively detecting hidden geological factors. The development process of coal geological guarantee technologies in China is systematically expatiated, from serving for resource exploration, high-yield and efficient mine construction to serving for safe and efficient production of coal mines, …

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Chemical Compositions And Technological Properties Of Low-Rank Coals In The South Shenfu Mining Area: Characteristics, Relationship And Practice, Guo Chen, Wang Shengquan, Shi Qingmin, Qiao Junwei, Li Huantong, Zhang Weiguo, Li Jun, Zhang Chi, Wang Xiaokang, Du Fangpeng Feb 2021

Chemical Compositions And Technological Properties Of Low-Rank Coals In The South Shenfu Mining Area: Characteristics, Relationship And Practice, Guo Chen, Wang Shengquan, Shi Qingmin, Qiao Junwei, Li Huantong, Zhang Weiguo, Li Jun, Zhang Chi, Wang Xiaokang, Du Fangpeng

Coal Geology & Exploration

Coal grading utilization is an essential way to fit its high-efficiency, clean and green development trends. Understanding the basic chemical composition and key technological properties of coal is the basis for achieving grading and qualitative utilization of coal resources. The South Shenfu mining area in Shaanxi Province is rich in coal reserves and it is an important low-rank coal production base in West China. However, it has not been able to achieve the qualitative utilization of coal practically completely for a long time, which restricts the full play of the value of coal resources and the further improvement of coal …

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The Characteristics Of Pore Structure And Gas Adsorption For Water-Immersion Coal After Drying, Si Leilei, Xi Yujun, Wang Hongyang, Wen Zhihui, Wei [email protected] Jianping Feb 2021

The Characteristics Of Pore Structure And Gas Adsorption For Water-Immersion Coal After Drying, Si Leilei, Xi Yujun, Wang Hongyang, Wen Zhihui, Wei [email protected] Jianping

Coal Geology & Exploration

In order to investigate the characteristics of pore structure and methane adsorption for water-immersion coal after drying, two coal samples with different ranks were soaked in distilled water for a long time(60 d). Then, the low-temperature N2 adsorption experiments and CO2 adsorption experiments were carried out to investigate the changing rules of pore structure for coal before and after water immersion, and the high-pressure capacity method was used to test the characteristics of methane adsorption. Results showed that the pore volume and specific surface area of coal decreased after water immersion. According to the results of low-temperature N …

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Numerical Analysis On Csw Fracturing Behavior Of Coal Seam Under Constraint Of Geological And Engineering Conditions, Qin Yong, Li Hengle, Zhang Yongmin, Zhao Youzhi, Zhao Jincheng, Qiu Aici Feb 2021

Numerical Analysis On Csw Fracturing Behavior Of Coal Seam Under Constraint Of Geological And Engineering Conditions, Qin Yong, Li Hengle, Zhang Yongmin, Zhao Youzhi, Zhao Jincheng, Qiu Aici

Coal Geology & Exploration

As a revolutionary technology for rock stratum reformation, the controllable shock wave(CSW) fracturing technology has achieved remarkable effect in coal seam reconstruction, and application exploration in the field of coal safety mining has been carried out. However, the previous understanding of the basic CWS fracturing rules under the constraints of geological engineering factors is insufficient due to the limitation of experimental and field monitoring conditions, which restricts the exploration of the fracturing mechanism and the optimization of the field operation parameters. In view of this, based on the description of CSW coal seam reformation and its engineering scientific problems, the …

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Study On Density Of The Supercritical Methane, Zhang Xinbin, Song Dangyu, Li Yunbo, Qi Yong'an, Fan Shunli Feb 2021

Study On Density Of The Supercritical Methane, Zhang Xinbin, Song Dangyu, Li Yunbo, Qi Yong'an, Fan Shunli

Coal Geology & Exploration

The density of supercritical methane is not only an important parameter for calculation of unconventional natural gas resources and adsorption capacity of methane in coal, but also a main indicator for measurement of the diffusion efficiency of supercritical methane and the ability to dissolve organic matter. Through analysis and comparison of the applicability of various gas state equations, it is realized that the Helmholtz energy state equation can accurately calculate the density of methane under the conditions of 0-30 MPa and 270-360 K. A calculation program for methane density was written using Microsoft Office Excel, and the error was less …

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Effects Of Alternating Stress On Casing Damage Mechanism, An Fengchen, Zhang Feiyang, Yi Hao, Zhang Sui'an Feb 2021

Effects Of Alternating Stress On Casing Damage Mechanism, An Fengchen, Zhang Feiyang, Yi Hao, Zhang Sui'an

Coal Geology & Exploration

Horizontal well staged fracturing technology of horizontal well has been widely used in the exploitation of low-permeability oil and gas reservoirs and coalbed methane, and has achieved good economic results. However, the vertical section of the casing is found to be damaged with serious deformation in the process of multi-stage hydraulic fracturing, which will prevent bridge plugs from being installed at the preferred design depths, thereby resulting in abandonment of all remaining fracturing stages. In this study, a user element is developed to simulate the mechanical behavior at the casing-cement sheath interface under cyclic loads. The developed element is then …

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Micro-Pore Structure And Fractal Characteristics Of Terrestrial Shales: A Case Study Of Shahezi Formation In Xujiaweizi Fault Depression, Lin Zizhi, Lu Shuangfang, Chang Xiangchun, Li Junqian, Zhang Pengfei, Zhou Nengwu, Zhang Yu, Wang Junjie, Huang Hongsheng Feb 2021

Micro-Pore Structure And Fractal Characteristics Of Terrestrial Shales: A Case Study Of Shahezi Formation In Xujiaweizi Fault Depression, Lin Zizhi, Lu Shuangfang, Chang Xiangchun, Li Junqian, Zhang Pengfei, Zhou Nengwu, Zhang Yu, Wang Junjie, Huang Hongsheng

Coal Geology & Exploration

The pore structure and fractal characteristics of shale are analyzed, and their impacting factors are also revealed using the low temperature nitrogen adsorption-desorption method, combined with scanning electron microscopy, C-S analysis and XRD. The results showed that the mineral compositions of Shahezi Formation continental shales were dominated by clay minerals, quartz and feldspar. The pore types in shales were mainly clay mineral intragranular pores, feldspar dissolution pores and grain edge pore, while the organic pores were not developed. The adsorption isotherms of shales belonged to the type Ⅳ isotherm according to the IUPAC, which develop two types of hysteresis loop, …

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Framework On Intelligent Decision Support System For Coal Seam Floor Water Hazard Prevention And Control, Jin Dewu, Li Peng Feb 2021

Framework On Intelligent Decision Support System For Coal Seam Floor Water Hazard Prevention And Control, Jin Dewu, Li Peng

Coal Geology & Exploration

Coal floor water inrush is a common type of water disaster in the production process of coal mines in North China coalfield. In order to solve the scientific decision making problem of water hazard prevention and control engineering and further improve the reliability of the relevant projects, this paper puts forward a technical idea of establishing an intelligent decision support system(IDSS). The IDSS is a combination of the traditional decision support system(DSS) and artificial intelligence. On the basis of analyzing the functional requirements of DSS for water hazard prevention and control, an integrated design process of "data-model-solution" is proposed, and …

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Deep Mining Under Safe Water Pressure Of Aquifer: Inheritance And Innovation, Yin Shangxian, Lian Huiqing, Xu Bin, Tian Wuzi, Cao Min, Yao Hui, Meng Haopeng Feb 2021

Deep Mining Under Safe Water Pressure Of Aquifer: Inheritance And Innovation, Yin Shangxian, Lian Huiqing, Xu Bin, Tian Wuzi, Cao Min, Yao Hui, Meng Haopeng

Coal Geology & Exploration

The paper reviews the development course of inheritance and innovation of mining under pressure, expounds the concept and the necessary and sufficient conditions of mining under pressure, and on the basis of the connotation of mining under pressure, the base level of erosion is defined as the boundary(interface) of shallow and deep mining under pressure. The paper clarified that mining above confined water is mining under pressure, while mining under aquifer does not belong to the category, and corrects the improper expression of roof and floor pressure in "Coal Mine Safety Regulations". This paper summarizes the theory and technology directly …

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Design And Implementation Of Mine Water Hazard Monitoring And Early Warning Platform, Lian Huiqing, Xu Bin, Tian Zhentao, Liu Demin, Yang Yi, Pan Guangyi, Wang Rui Feb 2021

Design And Implementation Of Mine Water Hazard Monitoring And Early Warning Platform, Lian Huiqing, Xu Bin, Tian Zhentao, Liu Demin, Yang Yi, Pan Guangyi, Wang Rui

Coal Geology & Exploration

Any mine water hazard will show different omens. In order to consolidate the foundation of intelligent early warning of water disaster, the connotation of system construction of perception, identification, evaluation, prediction and the interlogical relation are clarified. The mechanism of water inrush is varred for different types of water hazards, we designed three types of multi-mode water inrush typical scenarios and established the corresponding water inrush criteria. In addition, so we proposed two kinds of forecasting methods, namely the precise prediction of deterministic theory and the non-deterministic trend projections including big data and deep learning, which laid a solid theoretical …

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Investigation And Simutation On The Model And Prevention Technology Of Water Inrush From Roof Bed Separation, Zhang Wenquan, Wang Zaiyong, Wu Xintao, Shao Jianli, Lei Yu, Wu Xunan Feb 2021

Investigation And Simutation On The Model And Prevention Technology Of Water Inrush From Roof Bed Separation, Zhang Wenquan, Wang Zaiyong, Wu Xintao, Shao Jianli, Lei Yu, Wu Xunan

Coal Geology & Exploration

In order to prevent water inrush from roof separation, a partial backfill scheme is proposed for simulation study. First of all, based on the existing data, many kinds of separation water inrush accidents occurred in China were summarized and analyzed, and the disaster model of separation water accumulation was studied deeply. Then, taking the separation water accident of 1307 working face in the first mining area of a mine in Shaanxi Province as an example, the hydrogeological conditions and the relationship between upper aquifer and separation water inrush were analyzed, and the development characteristics of roof separation space of working …

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Experiment Investigation On The Influence Of Mixing Effect On Dispersion Scale Dependence, Ma Ziqi, Dai Zhenxue, Dong Shuning, Wang Hao, Liu Xiaoqian Feb 2021

Experiment Investigation On The Influence Of Mixing Effect On Dispersion Scale Dependence, Ma Ziqi, Dai Zhenxue, Dong Shuning, Wang Hao, Liu Xiaoqian

Coal Geology & Exploration

Dispersivity, a property parameter defined to characterize the degree of dispersion and mixing, is crucial for the prediction and remediation of groundwater contamination. However, in field tracer tests, the real mixing effect has often been ignored. In this paper, an aquifer with horizontal layered structure was simulated by laboratory experiments. Three kinds of media were chosen to reconstructed experimental aquifer. Two monitoring methods, buried sensor and sensor in the well, were adopted to compare the difference of breakthrough curves, so as to investigate the influence of mixing effect in the well on the dispersion scale dependence. The results showed that …

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Mechanism Of Water Rock Interaction In Coal Measure Sandstone Aquifer Disturbed By Grouting Engineering: A Case Study Of Taoyuan Coal Mine, Guo Yan, Gui Herong, Wei Jiuchuan, Ni Jianming, Cheng Rongfa, Pang Yingchun, Zhang Zhi, Hong Huang, Hu Mancong, Cui Yali, Liang Zhan, Li Jun, Chen Jiayu, Li Chen Feb 2021

Mechanism Of Water Rock Interaction In Coal Measure Sandstone Aquifer Disturbed By Grouting Engineering: A Case Study Of Taoyuan Coal Mine, Guo Yan, Gui Herong, Wei Jiuchuan, Ni Jianming, Cheng Rongfa, Pang Yingchun, Zhang Zhi, Hong Huang, Hu Mancong, Cui Yali, Liang Zhan, Li Jun, Chen Jiayu, Li Chen

Coal Geology & Exploration

Coal measure sandstone fissure water is one of the important water filling sources in coal mine. This paper takes the Permian coal measures in Taoyuan Coal Mine of Huaibei Coalfield as the research object. Based on the analysis of the water chemical characteristics of coal measures since the grouting treatment of water disaster in the mine, the mechanism of hydrogeochemical action of groundwater and its controlling factors were expounded. The results show that during the grouting treatment project, the main cation in coal measures water was Na+, and the main anion was SO42-; the relationship …

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Unsupervised Noise Suppression Method For Depth Network Seismic Data Based On Prior Information Constraint, Chen Wenchao, Liu Dawei, Wei Xinjian, Wang Xiaokai, Chen Dewu, Li Shuping, Li Dong Feb 2021

Unsupervised Noise Suppression Method For Depth Network Seismic Data Based On Prior Information Constraint, Chen Wenchao, Liu Dawei, Wei Xinjian, Wang Xiaokai, Chen Dewu, Li Shuping, Li Dong

Coal Geology & Exploration

Seismic data processing is a critical step in seismic exploration. Due to the complexity of underground structure and surface conditions, seismic data processing needs to go through a series of complex processes, thus forming various types of seismic data. Different types of seismic data have different data characteristics. Exploring and making full use of the data characteristics can not only give full play to the technical potential of processing methods, eliminate the influence of various non-geological factors on the quality of seismic data processing, but also enhance the reliability of seismic data processing. Improving the signal-to-noise ratio and resolution of …

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Design And Analysis Of Hole-Forming Technology For Surface Large Diameter Emergency Rescue Borehole, Hao Shijun, Mo Haitao Feb 2021

Design And Analysis Of Hole-Forming Technology For Surface Large Diameter Emergency Rescue Borehole, Hao Shijun, Mo Haitao

Coal Geology & Exploration

Surface large diameter borehole can be used as the escape channel for trapped people underground, and it is one of the important emergency rescue plans when mine accidents cause people trapped underground. However, the conventional large-diameter engineering hole is mainly formed by mud positive circulation and multi-stage reaming, which can not meet the rescue requirements. Focusing on the purpose of rescue and escape of large-diameter hole, this paper expounds the hole forming technology design principles including accurate connecting roadway, optimization of borehole structure, high-efficiency hole forming and safety connecting roadway. According to the specific construction conditions of overburden drilling, second …

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Distribution And Occurrence Of Uranium In Coal And Its Migration Behavior During The Coal Utilization, Wang Wenfeng, Wang Wenlong, Liu Shuangshuang, Bai Hongyang, Wang Yulong, Duan Piaopiao, Qin Kemin, Chen Yilin Feb 2021

Distribution And Occurrence Of Uranium In Coal And Its Migration Behavior During The Coal Utilization, Wang Wenfeng, Wang Wenlong, Liu Shuangshuang, Bai Hongyang, Wang Yulong, Duan Piaopiao, Qin Kemin, Chen Yilin

Coal Geology & Exploration

Coal and uranium resources are closely related in spatial disposition as well as mineralization, and the reasonable development, utilization and pollution control of them play an essential role in the sustainable development of our national economy and society. Based on a large number of literature research and the previous results of our research group, some conclusions were drawn with regard to the distribution and occurrence of uranium in coal `and its migration in the process of coal preparation, combustion and leaching:(1) The enrichment and mineralization of uranium in coal has reflected the evolution of coal-forming tectonics:The U-rich coal in Southwest …

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Evaluation Of The Hydro-Fracturing Potential For Coalbed Methane Reservoir: A Case Study Of Zhengzhuang Cbm Field, Yao Yanbin, Wang Hui, Yang Yanhui, Liu Dameng, Lu Xiuqin, Cao Lutong Feb 2021

Evaluation Of The Hydro-Fracturing Potential For Coalbed Methane Reservoir: A Case Study Of Zhengzhuang Cbm Field, Yao Yanbin, Wang Hui, Yang Yanhui, Liu Dameng, Lu Xiuqin, Cao Lutong

Coal Geology & Exploration

The "double low" rate of exploration and utilization of CBM resources in China leads to a significant slowdown in CBM production, which has become a bottleneck restricting the development of CBM industry in China. The common CBM reservoir evaluation method did not pay enough attention to the hydro-fracturing potential, resulting in low discovery rate of high-quality gas reserves and low mobilization-rate of the present reserves. Thus, it is extremely necessary to do some research regarding to hydro-fracturing potential evaluation. Targeting on the Zhengzhuang CBM field of the southern Qinshui Basin, this study did comprehensive investigations including coal core analysis, physical …

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Comprehensive Testing Research On Floor Damage Characteristics Of Mining Extra-Thick Seam In Jungar Coalfield, Zhang Pingsong, Liu Chang, Ou Yuanchao, Sun Binyang, Xu Shi'ang, Li Shenglin Feb 2021

Comprehensive Testing Research On Floor Damage Characteristics Of Mining Extra-Thick Seam In Jungar Coalfield, Zhang Pingsong, Liu Chang, Ou Yuanchao, Sun Binyang, Xu Shi'ang, Li Shenglin

Coal Geology & Exploration

The 6th coal seam of the Carboniferous Permian in a coal mine in the Ordos Basin of Inner Mongolia is an extra-thick coal seam with an average minable thickness of 17.0 m. Its floor is threatened by limestone water. Distributed sensing optical fiber technology and cross-hole resistivity CT in situ comprehensive testing technology were used in the field, and the response characteristics of strain field and geoelectric field were obtained successively during mining. Combined with the threshold value of the discriminant parameter for loading deformation and failure of rock samples and detection section of practice, the monitoring data of the …

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Experimental Study On The Influence Of Co2 Injection Pressure On Gas Diffusion Coefficient, Zhou Xihua, Han Mingxu, Bai Gang, Lan Anchang, Fu Zhihao Feb 2021

Experimental Study On The Influence Of Co2 Injection Pressure On Gas Diffusion Coefficient, Zhou Xihua, Han Mingxu, Bai Gang, Lan Anchang, Fu Zhihao

Coal Geology & Exploration

Most of the coal seams in China are characterized by low pressure, low permeability and low saturation. The methane gas in the coal seam is slowly desorbed and diffused slowly, which affects the production rate of coalbed methane. The coal samples from Zhaozhuang Coal Mine of Jinmei Group were selected to study the influence of different gas injection pressure on CH4 displacement process and the variation law of CH4 diffusion coefficient in the process of displacement. Independently developed CO2 displacement CH4 test platform was used to carry out the experiments under different gas injection pressures such …

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