检索结果-南通市图书馆

Mechanical behaviors of coal measures and ground control technologies for china's deep coal mines-A review

Journal of Rock Mechanics and Geotechnical Engineering 2023年第1期15卷 37-65页

作者： Hongpu Kang Fuqiang Gao Gang Xu Huaiwei Ren CCTEG coal Mining research institute BeijingChina coal Mining Branch China Coal Research InstituteBeijingChina State Key Laboratory of coal Mining and Clean Utilization China Coal Research InstituteBeijingChina

This paper reviews the major achievements in terms of mechanical behaviors of coal measures,mining stress distribution characteristics and ground control in china’s deep underground coal mining.The three main aspects of this review are coal measure mechanics,mining disturbance mechanics,and rock support mechanics.Previous studies related to these three topics are reviewed,including the geo-mechanical properties of coal measures,distribution and evolution characteristics of mining-induced stresses,evolution characteristics of mining-induced structures,and principles and technologies of ground control in both deep roadways and longwall faces.A discussion is made to explain the structural and mechanical properties of coal measures in china’s deep coal mining practices,the types and dis-tribution characteristics of in situ stresses in underground coal mines,and the distribution of mining-induced stress that forms under different geological and engineering conditions.The theory of pre-tensioned rock bolting has been proved to be suitable for ground control of deep underground coal roadways.The use of combined ground control technology(e.***.ground support,rock mass modification,and destressing)has been demonstrated to be an effective measure for rock control of deep roadways.The developed hydraulic shields for 1000 m deep ultra-long working face can effectively improve the stability of surrounding rocks and mining efficiency in the longwall face.The ground control challenges in deep underground coal mines in china are discussed,and further research is recommended in terms of theory and technology for ground control in deep roadways and longwall faces.

关键词： Deep underground coal mine Mechanical behavior Mining-induced stress Mining-induced fractures Ground control for roadways Ground control for working face

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

An efficient and innovative catalytic reactor for VOCs emission control

引用

Science Bulletin 2019年第9期64卷 625-633页

作者： Achraf El Kasmi Guan-Fu Pan Ling-Nan Wu Zhen-Yu Tian institute of Engineering Thermophysics Chinese Academy of Sciences University of Chinese Academy of Sciences energy conservation Corporation Ltd.of china coal research institute Beijing 100013China

Efficient mixing and thermal control are important in the flow reactor for obtaining a high product yield and selectivity.Here,we report a heterogeneous chemical kinetic study of propene oxidation within a newly designed catalytic jet-stirred reactor(CJSR).To better understand the interplay between the catalytic performances and properties,the CuO thin films have been characterized and the adsorbed energies of propene on the adsorbed and lattice oxygen were calculated using density functional theory(DFT)method.Structure and morphology analyses revealed a monoclinic structure with nano-crystallite size and porous microstructure,which is responsible for holding an important quantity of adsorbed oxygen.The residence time inside the flow CJSR(1.12–7.84 s)makes it suitable for kinetic study and gives guidance for scale-up.The kinetic study revealed that using CJSR the reaction rate increases with O_2concentration that is commonly not achievable for catalytic flow tube reactor,whereas the reaction rate tends to increase slightly above 30%of O_2due to the catalyst surface saturation.Moreover,DFT calculations demonstrated that adsorbed oxygen is the most involved oxygen,and it has found that the pathway of producing propene oxide makes the reaction of C_3H_6over CuO surface more likely to proceed.Accordingly,these findings revealed that CJSR combined with theoretical calculation is suitable for kinetic study,which can pave the way to investigate the kinetic study of other exhaust gases.

关键词： Novel catalytic jet-stirred reactor Heterogeneous kinetic study Exhaust emission control CuO thin film catalyst DFT calculation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The Impact of Key Factors on Flow Characteristics of 14 MW Reverse-Swirl Pulverized coal Burner

引用

Journal of Thermal Science 2021年第6期30卷 2214-2222页

作者： JIA Nan NIU Fang LIU Pengzhong WANG Zhixing WANG Naiji ZHOU Jianming China Coal Research Institute Company of Energy Conservation Beijing 100013China State Key Laboratory of High Efficient Mining and Clean Utilization of coal Resources Beijing 100013China National energy Technology&Equipment Laboratory of coal Utilization and Emission Control Beijing 100013China

Reverse-swirl(RS)burner which has been industrialized couples reverses jet and swirl flow for the stabilization of flame.Using Dantec multichannel constant-temperature anemometer,experiments on airflow characteristics were implemented on a 1:2 scaled burner model with different values in terms of reverse primary air(RPA)ratio and swirl inner secondary air(SISA)ratio.It was found that the shape of annular coupled recirculation zone(ACRZ)had stayed symmetrical all the time.The RPA ratio was the main factor that had an impact on the values of axial and RMS velocity as well as the radial velocity direction of ACRZ.Both RPA ratio and SISA ratio had a great impact on the area of ACRZ,relative reverse flow rate,mixing between SISA and outer secondary air(OSA)as well as swirling ability of the airflow.The area of ACRZ reached its peak when the RPA ratio was 11.92%or SISA ratio was 17.03%;however,when the RPA ratio and SISA ratio reached 14.86%and 28.41%respectively,the combination of RPA and SISA became relatively favorable;besides,ACRZ area,relative reverse flow and swirling ability became suitable and the mixing between SISA and OSA was relatively delayed.The research was of great practical and theoretical importance to the design and operation of RS burner.

关键词： reverse-swirl burner reverse primary air swirl inner secondary air annular coupled recirculation zone flow characteristics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Automatic microseismic events detection using morphological multiscale top-hat transformation

引用

Petroleum Science 2022年第5期19卷 2027-2045页

作者： Guo-Jun Shang Wei-Lin Huang Li-Kun Yuan Jin-Song Shen Fei Gao Li-Song Zhao State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum-BeijingBeijing102249China Department of Automation China University of Petroleum-BeijingBeijing102249China Hebei coal research institute company Ltd. Jizhong Energy GroupXingtaiHebei 054000China

The occurrence of microseismic is not random but is related to the physical properties of the underground medium.Due to the low intensity and the influence of noise,microseismic eventually lead to poor signal-to-noise ratio.We proposed a method for automatic detection of microseismic events by adoption of multiscale top-hat transformation.The method is based on the difference between the signal and noise in the multiscale top-hat transform section and achieves the detection on a specific section.The microseismic data are decomposed into different scales by multiscale morphology top-hat transformation firstly.Then the potential microseismic events could be detected by picking up the peak value in the multiscale top-hat section,and the characteristic profile obtains the start point with a specific threshold value.Finally,the synthetic data experiences demonstrate the advantages of this method under strong and weak noisy conditions,and the filed data example also shows its reliability and adaptability.

关键词： Microseismic events detection Multiscale morphology Top-hat transformation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Flexible Operation Mode of coal-fired Power Unit Coupling with Heat Storage of Extracted Reheat Steam

引用

Journal of Thermal Science 2022年第2期31卷 436-447页

作者： WEI Haijiao LU Yuanwei YANG Yanchun ZHANG Cancan WU Yuting LI Weidong ZHAO Dongming MOE Key Laboratory of Enhanced Heat Transfer and energy conservation Beijing Key Laboratory of Heat Transfer and Energy ConversionFaculty of Environment and LifeBeijing University of TechnologyBeijing 100124China china Huaneng Group Clean energy research institute Co.Ltd Beijing 102209China

In order to provide more grid space for the renewable energy power,the traditional coal-fired power unit should be operated flexibility,especially achieved the deep peak shaving capacity.In this paper,a new scheme using the reheat steam extraction is proposed to further reduce the load far below 50%rated power.Two flexible operation modes of increasing power output mode and reducing fuel mode are proposed in heat discharging process.A 600 MW coal-fired power unit with 50%rated power is chosen as the research model.The results show that the power output is decreased from 300.03 MW to 210.07 MW when the extracted reheat steam flow rate is 270.70 t·h^(-1),which increases the deep peak shaving capacity by 15%rated power.The deep peak shaving time and the thermal efficiency are 7.63 h·d^(-1)and 36.91%respectively for the increasing power output mode,and they are 7.24 h·d^(-1)and 36.58%respectively for the reducing fuel mode.The increasing power output mode has the advantages of higher deep peak shaving time and the thermal efficiency,which is recommended as the preferred scheme for the flexible operation of the coal-fired power unit.

关键词： coal-fired power unit flexible operation deep peak shaving extracted reheat steam heat storage

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Multi-stage gas diffusion and its implications for the productivity of coalbed methane in the southern Qinshui Basin, north china

引用

Frontiers of Earth Science 2023年第1期17卷 109-120页

作者： Hui WANG Yanbin YAO Zhentao LI Yanhui YANG Junjie YI Yongkai QIU Shengqiang ZHOU School of energy Resource China University of GeosciencesBeijing 100083China coal Reservoir Laboratory of National Engineering research Center of CBM Development&Utilization China University of GeosciencesBeijing 100083China State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China Petrochina Huabei Oilfield company Renqiu 062552China institute of Mineral Resources research Beijing 101300China

The behavior of coalbed methane(CBM)diffusion considerably influences gas productivity.Based on the multi-porous diffusion model and on-site CBM desorption data of coal cores,the behavior of CBM diffusion and its implications on the gas productivity of No.3 coal seam in the southern Qinshui Basin(SQB)were elaborately analyzed.Results indicate that CBM diffusion of No.3 coal seam demonstrates noticeable three-stage characteristics,including the fast diffusion,transitional diffusion,and slow diffusion stages.During the gas diffusion process,the gas content and/or the degree of developed pores and fractures/cleats in coal seams can affect the desorption of CBM and the amount of diffused CBM by influencing the changes in gas pressure in pores,thus controlling the behavior of gas diffusion in different stages.Because gas content and the developed degree of pores and fractures/cleats are closely associated with the deformation degree of the coal seams,variably deformed coal seams exhibit unique characteristics of gas diffusion.The low-deformation degree of the coal seams have a relatively uniform distribution of gas production over the history of a well.By contrast,the moderate-deformation degree of the coal seams have a relatively high rate and amount of gas diffusion in the fast and transitional diffusion stages,producing most of the gas in the early-to-intermediate stages of the wells.Finally,the high-deformation degree of the coal seams has a high rate and amount in the fast diffusion stage,indicating that most of the production stage occurs during the early stage of the gas production history of a well.In summary,the behavior of gas diffusion can be used for predicting gas production potential.

关键词： coalbed methane gas diffusion CBM production coal deformation Qinshui Basin

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Critical tectonic events and their geological controls on deep buried coalbed methane accumulation in Daning-Jixian Block, eastern Ordos Basin

引用

Frontiers of Earth Science 2023年第1期17卷 197-217页

作者： Taotao YAN Shan HE Shuai ZHENG Yadong BAI Wei CHEN Yanjun MENG Shangwen JIN Huifang YAO Xiaobao JIA College of Mining Engineering Taiyuan University of TechnologyTaiyuan 030024China coal Reservoir Laboratory of National Engineering research Center of CBM Development&Utilization China University of GeosciencesBeijing 100083China Shanxi CBM Exploration and Development Branch PetroChina Huabei Oilfield CompanyChangzhi 046000China china coal Geology Group Co. LtdBeijing 100083China research institute of Petroleum Exploration and Development-Northwest PetroChinaLanzhou 730000China Beijing Furuibao energy Technology company Beijing 100176China Shanxi Province 148 Ecological Geology Technology Co. LtdTaiyuan 030053China

Commercial exploration and development of deep buried coalbed methane (CBM) in Daning-Jixian Block, eastern margin of Ordos Basin, have rapidly increased in recent decades. Gas content, saturation and well productivity show significant heterogeneity in this area. To better understand the geological controlling mechanism on gas distribution heterogeneity, the burial history, hydrocarbon generation history and tectonic evolution history were studied by numerical simulation and experimental simulation, which could provide guidance for further development of CBM in this area. The burial history of coal reservoir can be classified into six stages, i.e., shallowly buried stage, deeply burial stage, uplifting stage, short-term tectonic subsidence stage, large-scale uplifting stage, sustaining uplifting and structural inversion stage. The organic matter in coal reservoir experienced twice hydrocarbon generation. Primary and secondary hydrocarbon generation processes were formed by the Early and Middle Triassic plutonic metamorphism and Early Cretaceous regional magmatic thermal metamorphism, respectively. Five critical tectonic events of the Indosinian, Yanshanian and Himalayan orogenies affect different stages of the CBM reservoir accumulation process. The Indosinian orogeny mainly controls the primary CBM generation. The Yanshanian Orogeny dominates the second gas generation and migration processes. The Himalayan orogeny mainly affects the gas dissipation process and current CBM distribution heterogeneity.

关键词： deep buried coalbed methane coal reservoir accumulation evolution numerical simulation Daning-Jixian Block

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Full-area Exploration Test of Deep Concealed Ore Bodies based on Tunnel Gravity

引用

Acta Geologica Sinica(English Edition) 2021年第S01期95卷 94-98页

作者： ZENG Youqiang ZENG Gaofu HUANG Lishan GUO Jianlei WANG Jianchao china Nonferrous Metal(Guilin)Geology and Mining company Limited GuilinGuangxi 541004China Xi’an research institute of china coal Technology&Engineering Group Xi’an 710077China

Metal mineral resources are the product of the deep material and energy exchange with its deep power process(Wan,2017).It is the foundation of contemporary national economic development,a priority area for the country... 详细信息

关键词： tunnel gravity exploration localization exploration in full-area concealed orebodies deep detection

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Combustion mechanism and control approaches of underground coal fires:a review

引用

International Journal of coal Science & Technology 2023年第2期10卷 58-82页

作者： Yuntao Liang Yalan Yang Sida Guo Fuchao Tian Shaofeng Wang State Key Laboratory of coal Mine Safety Technology China Coal Technology&Engineering Group Shenyang Research InstituteShenfu Demonstration ZoneShenyang 113122China School of Resources and Safety Engineering Central South UniversityChangsha 410083China

With the large-scale mining of coal resources,the huge economic losses and environmental problems caused by underground coal fires have become increasingly prominent,and the research on the status quo and response strategies of underground coal fires is of great significance to accelerate the green prevention and control of coal fires,energy conservation and emission reduction.In this paper,we summarized and sorted out the research status of underground coal fires,focused on the theoretical and technical issues such as underground coal fire combustion mechanism,multiphysics coupling effect of coal fire combustion,fire prevention and extinguishing technology for underground coal fires,and beneficial utilization technology,and described the latest research progress of the prevention and control for underground coal fire hazards.Finally,the key research problems in the field of underground coal fire hazards prevention and control were proposed in the direction of the basic theory,technology research,comprehensive management and utilization,with a view to providing ideas and solutions for the management of underground coal fires.

关键词： Underground coal fire Combustion mechanism Multiphysics coupling effect Disaster prevention and control Turning harm into benefit Response strategy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Genetic types and geochemicai characteristics of natural gases in the Jiyang Depression,china

引用

Petroleum Science 2015年第1期12卷 81-95页

作者： Wen-Tao Li Yang Gao Chun-Yan Geng School of energy Resources China University of Geosciences Geoscience research institute Shengli Oilfield Company SINOPEC

Natural gases were widely distributed in the Jiyang Depression with complicated component composition, and it is difficult to identify their genesis. Based on investigation of gas composition, carbon isotope ratios, light hydrocarbon properties, as well as geological analysis, natural gases in the Jiyang Depression are classified into two types, one is organic gas and the other is abiogenic gas. Abiogenic gas is mainly magmatogenic or mantlederived CO2. Organic gases are further divided into coaltype gas, oil-type gas, and biogas according to their kero- gen types and formation mechanisms. The oil-type gases are divided into mature oil-type gas （oil-associated gas） and highly mature oil-type gas. The highly mature oil-type gases can be subdivided into oil-cracking gas and kerogen thermal degradation gas. Identification factors for each kind of hydrocarbon gas were summarized. Based on genesis analysis results, the genetic types of gases buried in different depths were discussed. Results showed that shallow gases （〈1,500 m） are mainly mature oil-type gases, biogas, or secondary gases. Secondary gases are rich in methane because of chromatographic separation during migration and secondary biodegradation. Secondary biodegradation leads to richness of heavy carbon isotope ratios in methane and propane. Genesis of middle depth gases （1,500-3,500 m） is dominated by mature oil-type gases.Deep gases （3,500-5,500 m） are mainly kerogen thermal degradation gas, oil-cracking gas, and coal-type gas.

关键词： Genetic types Natural gases Jiyang Depression Light hydrocarbon properties Carbon isotope ratios Identification factors

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：