检索结果-南通市图书馆

Regional gas drainage techniques in Chinese coal mines

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2012年第6期22卷 873-878页

作者： Wang Haifeng cheng yuanping Wang Lei National Engineering Research Center of Coal Gas Control China University of Mining & Technology

China's rapid economic development has increased the demand for *** results in Chinese coal mines being extended to deeper *** eastern Chinese,more economical developed,regions have a long history of coal mining and many coal mines have now started deep mining at a depth from 800 to 1500 *** increase in mining depth,geostresses,pressures,and gas content of the coal seam complicates geologic construction *** permeability and softer coal contribute to increasing numbers of coal and gas outburst,and gas explosion,disasters.A search on effective methods of preventing gas disasters has been provided funds from the Chinese government since *** National Engineering Research Center of Coal Gas Control and the Huainan and Huaibei Mining Group have conducted theoretical and experimental research on a regional gas extraction *** results included two important ***,grouped coal seams allow adoption of a method where a first,key protective layer is mined to protect upper and lower coal seams by increasing permeability from 400 to 3000 *** of gas and gas extraction in the protected coal seam of up to 60%,or more,may be achieved in this ***,a single seam may be protected by using a dense network of extraction boreholes consisting of cross and along-bed *** with this is increased use of water that increases extraction of coal seam gas by up to 50%.Engineering practice showed that regional gas drainage technology eliminates regional coal and gas outburst and also enables mining under low gas *** research results have been adopted into the national safety codes of production *** paper systematically introduces the principles of the technology,the engineering methods and techniques,and the parameters of regional gas *** applications are discussed.

关键词： Coal and gas outburst Gas drainage Protective seam Pressure-relief gas Dense borehole

Reservoir reconstruction technologies for coalbed methane recovery in deep and multiple seams

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2017年第2期27卷 277-284页

作者： Wang Liang Liu Shimin cheng yuanping Yin Guangzhi Zhang Dongming Guo Pinkun State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China Key Laboratory of Gas and Fire Control for Coal Mine School of Safety EngineeringChina University of Mining and TechnologyXuzhou 221116China Department of Energy and Mineral Engineering G3 Center and Energy InstituteThe Pennsylvania State UniversityUniversity ParkPA 16802USA National Engineering Research Center for Coal and Gas Control China University of Mining and TechnologyXuzhou 221116China Department of Civil Engineering Logistical Engineering UniversityChongqing 400041China

Multiple coal seams widely develop in the deep Chinese coal-bearing strata. Ground in situ stress and coal seam gas pressure increase continuously with the increase of the mining depth, and coal and gas outburst disasters become increasingly severe. When the coal is very deep, the gas content and pressure will elevate and thus coal seams tends to outburst-prone seams. The safety and economics of exploited firstmined coal seams are tremendously restricted. Meanwhile, the multiple seams occurrence conditions resulted in different methane pressure systems in the coal-bearing strata, which made the reservoir reconstruction of coal difficult. Given the characteristics of low saturation, low permeability, strong anisotropy and soft coal of Chinese coal seams, a single hydraulic fracturing surface well for reservoir reconstruction to pre-drain the coalbed methane(CBM) of multiple seams concurrently under the different gas pressure systems has not yet gained any breakthroughs. Based on analyses of the main features of deep CBM reservoirs in China, current gas control methods and the existing challenges in deep and multiple seams, we proposed a new technology for deep CBM reservoir reconstruction to realize simultaneous high-efficiency coal mining and gas extraction. In particular, we determined the first-mined seam according to the principles of effectiveness and economics, and used hydraulic fracturing surface well to reconstruct the first-mined seam which enlarges the selection range of the first-mined seam. During the process of mining first-mined seam, adjacent coal seams could be reconstructed under the mining effect which promoted high-efficiency pressure relief gas extraction by using spatial and comprehensive gas drainage methods(combination of underground and ground CBM extraction methods). A typical integrated reservoir reconstruction technology, ‘‘One well for triple use", was detailed introduced and successfully applied in the Luling coal mine. The application s

关键词： Reservoir reconstruction Coalbed methane Multiple seam Surface well Gas drainage

Characteristics and dominant controlling factors of gas outburst in Huaibei coalfield and its countermeasures

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2013年第4期23卷 578-583页

作者： Haifeng Wang Liang Wang yuanping cheng Hongxing Zhou School of Safety Engineering National Engineering Research Center of Coal Gas Control China University of Mining & Technology Xuzhou 221116 China School of Safety Engineering National Engineering Research Center of Coal Gas Control China University of Mining & Technology Xuzhou 221116 China Post-Doctoral Research Station of Huaibei Mining Corporation Limited Huaibei 235000 China

In order to master the main characteristics and controlling factors of gas disasters in Huaibei coalfeld,based on data analysis,experimental determination and theoretical research,we analyzed the geological evolution and gas parameters in Huaibei mining *** results show that Huaibei coalfeld is located in Xu-Su arcuate tectonic circle,and the coal seam and gas occurrence took on *** dominant controlling factors of gas outburst were tectonic structures,tectonic stress,magma intrusion and mining *** geological conditions of Huaibei coalfeld were very complicated,and almost all the outburst accidents occurred in tectonic structure *** horizontal tectonic stress played a dominant role in outburst *** thermal evolution and trap effect of magma intrusion controlled the physical characteristics of coal,gas occurrence and *** the increase of mining depth,the possibility of gas outburst accidents increased *** carrying out several effective regional measurements,the gas control effect was obvious and could ensure safety and high effciency mining in outburst coal seams.

关键词： Huaibei coalfield Coal and gas outburst Tectonic stress Magma intrusion Dominant controlling factor Countermeasure

CO_2 isothermal adsorption models of coal in the Haishiwan Coalfield

在线全文

学校读者我要写书评

暂无评论

Mining Science and Technology 2010年第2期20卷 281-285页

作者： LI, Wei cheng, yuanping WU, Dongmei AN, Fenghua national engineering research center for coal & gas control china university of mining & technologyxuzhou 221008china

Since the capacity of CO2 adsorption of coal is a key factor in coal and CO2 outbursts,an experimental study was carried out on CO2 isothermal adsorption with high-pressure volumetry with dry coal samples from the No.2 coal seam in the Haishiwan *** different equations(Langmuir,BET,D-R and D-A) were used to fit the experimental *** discuss adsorption *** results show that the amount of CO2 adsorption increases rapidly under low relative pressure,i.e.,the ratio of equilibrium pressure and saturated vapor pressure,which indicates that molecular layer adsorption or micropore filling may occur in *** clear equilibrium state was observed on the isothermal adsorption curves under relative pressure(P /P0 ) ranging from 0 to *** fitted results show that the accuracy of the D-A equation is highest with n=*** are more developed in coal by comparing the BET equation with a pressure mercury injection method on the surface *** D-A equation(n=1) provides the best *** comparing the calculated specific surface area of the BET equation and the mercury intrusion method,it is found that micropore adsorption of CO2 occupies a dominant position.

关键词： carbon dioxide gas isothermal adsorption adsorption model micropore filling molecular layer adsorption

Partitioning characteristics of gas channel of coal-rock mass in mining space and gas orientation method

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2013年第6期23卷 873-877页

作者： Zhao Zhiqiang Ma Nianjie Jia Housheng cheng yuanping School of Resource and Safety Engineering China University of Mining&Technology National Engineering Research Center for Coal Gas Control China University of Mining&Technology

In order to research the influence of coal-rock mass morphology of mining space on the flow law of gas,the laboratory physical model and numerical computation methods were adopted to simulate coal mining *** simulation results indicate that,after coal seam mining,the loose rock accumulation body of free caving,ordered rock arrangement body of plate damage rich in longitudinal and transverse fractures and horizontal fissure body formed by rock mass deformation imbalance are formed from bottom to top in the mining *** these three types of accumulation bodies,there are essential differences in the accumulation state,rock size and gas breakover *** to this,the coal-rock mass in the mining space is classified into gas turbulence channel area,gas transitional flow channel area and gas seepage channel *** the turbulence channel area,the gas is distributed transversely and longitudinally and gas diffuses in the form of convection with Reynolds number R_e more than100;in the transitional flow channel area,one-way or two-way gas channels are crisscross and gas is of transitional flow regime with R,.between 10 and *** the seepage channel area,there are a few vertical gas channels with R,.less than *** this paper,the researches on the gas orientation method in different partitions were further carried out,gas orientation methods of low-level pipe burying,middle-level interception and high-level extraction were determined and an on-site industrial test was conducted,achieving the effective diversion of gas and verifying the reasonableness of gas channel partition.

关键词： Gas channel Partitioning characteristics Gas flow regime Gas orientation method

在线全文

学校读者我要写书评

暂无评论

Mining Science and Technology 2010年第2期20卷 188-192页

作者： WANG, Haifeng cheng, yuanping YUAN, Liang WANG, Liang national engineering research center for coal & gas control china university of mining & technologyxuzhou 221008china huainan mining industry (group) limited liability company postdoctoral science research workstationhuainan 232046china

For a study of the movement and deformation of coal-rock mass and low protected seams below a stope,as well as for fracture developments and rules of evolution of permeability,we designed a plane strain model test stand to carry out model tests of similar materials in order to improve the effect of gas drainage from low protected seams and to measure the movement and deformation of coal-rock mass using a method of non-contact close-range *** results show that 1) using paraffin melting to take the place of coal seam mining can satisfy the mining conditions of a protective seam;2) coal-rock mass under goafs has an upward movement after the protective seam has been mined,causing floor heaving;3) low protected seams become swollen and deformed,providing a good pressure-relief effect and causing the coal-rock mass under both sides of coal pillars to become deformed by compression and 4) the evolution of permeability of low protected seams follows the way of initial values→a slight decrease→a great increase→stability→final ***,the coefficient of air permeability increased at a decreasing rate with an increase in interlayer spacing.

关键词： coal-rock mass below stope low protected seam plane strain similar model test

Experimental analysis of pore structure and fractal characteristics of soft and hard coals with same coalifcation

在线全文

学校读者我要写书评

暂无评论

International Journal of Coal Science & Technology 2022年第4期9卷 107-121页

作者： Barkat Ullah yuanping cheng Liang Wang Weihua Yang Izhar Mithal Jiskani Biao Hu School of Safety Engineering China University of Mining and TechnologyXuzhouChina School of Resources and Safety Engineering Central South UniversityChangshaChina NUST Balochistan Campus National University of Sciences and TechnologyQuettaPakistan

Accurate and quantitative investigation of the physical structure and fractal geometry of coal has important theoretical and practical signifcance for coal bed methane(CBM)development and the prevention of dynamic disasters such as coal and gas *** study investigates the pore structure and fractal characteristics of soft and hard coals using nitrogen and carbon dioxide(N_(2)/CO_(2))*** samples from Pingdingshan Mine in Henan province of China were collected and pulverized to the required size(0.20–0.25 mm).N_(2)/CO_(2)adsorption tests were performed to evaluate the specifc surface area(SSA),pore size distribution(PSD),and pore volume(PV)using Braunuer-Emmett-Teller(BET),Barrett-Joyner-Halenda(BJH),and Density Functional Theory(DFT).The pore structure was characterized based on the theory of fractal *** results unveiled that the strength of coal has a signifcant infuence on pore structure and fractal *** are signifcant diferences in SSA and PV between both *** BJH-PV and BET-SSA obtained by N_(2)-adsorption for soft coal are 0.029–0.032 cm^(3)/g and 3.523–4.783 m^(2)/*** the values of PV and SSA obtained by CO_(2)-adsorption are 0.037–0.039 cm^(3)/g and 106.016–111.870 m^(2)/*** coal shows greater SSA and PV than hard coal,which is consistent with the adsorption capacity(VL).The fractal dimensions of soft and hard coal are respectively *** Ding coal exhibits larger D1 and smaller D_(2),and the reverse for the Wu coal seam is *** greater the value of D1(complexity of pore surface)of soft coal is,the larger the pore surface roughness and gas adsorption capacity *** results enable us to conclude that the characterization of pores and fractal dimensions of soft and hard coals is diferent,tending to diferent adsorption/desorption *** this regard,the results provide a reference for formulating corresponding coal and gas outburst prevention and control measures.

关键词： Methane adsorption Soft and hard coal Pore structure Fractal characteristics N_(2)/CO_(2)adsorption

Effects of coal rank on physicochemical properties of coal and on methane adsorption

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

International Journal of Coal Science & Technology 2017年第2期4卷 129-146页

作者： yuanping cheng Haina Jiang Xiaolei Zhang Jiaqing Cui cheng Song Xuanliang Li National Engineering Research Center of Coal Gas Control China University of Mining and TechnologyXuzhou 221116 Jiangsu China Faculty of Safety Engineering China University of Miningand Technology Xuzhou 221116 Jiangsu China Institute of Mining Technology Taiyuan University ofTechnology Taiyuan 030024 Shanxi China School of Environmental and Safety Engineering ChangzhouUniversity Changzhou 213164 China

For the thorough research on coal metamorphism impact on gas adsorption capacity, this paper collected and summarized parameters of experimental adsorption isotherms, coal maceral, proximate analysis and ultimate analysis obtained from National Engineering Research Center of Coal Gas Control and related literatures at home and abroad, systematically discussed the coal rank effect on its physicochemical properties and methane adsorption capacity, in which the coal rank was shown in Vitrinite reflectance, furthermore, obtained the Semi-quantitative relationship between physicochemical properties of coal and methane adsorption capacity.

关键词： Coal rank Methane Physicochemical properties Adsorption Statistical analysis Semi-quantitative

Characteristics of mining gas channel expansion in the remote overlying strata and its control of gas flow

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

International Journal of Mining Science and Technology 2013年第4期23卷 480-486页

作者： Liu Hongyong cheng yuanping Chen Haidong Mou Junhui Kong Shengli School of Safety Engineering China University of Mining & Technology National Engineering Research Center of Coal Gas Control China University of Mining & Technology Key Laboratory of Gas and Fire Control for Coal Mine China University of Mining & Technology Post-Doctoral Scientifc Research Station in Shanxi Coking Coal Group Co. Ltd.

The technology of pressure relief gas drainage is one of the most effective and economic for preventing gas emissions in underground *** on current understanding of strata breakage and fracture development in overlying strata,the current study divides the overlying strata into the following three longitudinal zones in terms of the state of gas flow:a turbulent channel zone,a transitional circulation channel zone and a seepage channel *** to the key strata discrimination theory of controlling the overlying strata,the calculation method establishes that the step-type expansion of the mining gas channel corresponds to the advancing distance of working face,and this research also confrms the expanding rule that the mining gas channel in overlying strata follows the advancing distance of mining working *** on the geological conditions of Xinjing Coal Mine of Yangquan,this paper researches the expanding rule of mining gas channel as well as the control action of the channel acting on the pressure relief flow under the condition of the remote protective layer,and got the distance using inversion that the step-type expanding of mining gas channel is corresponding to the advancing distance of working face,which verifes the accuracy and feasibility of theoretical calculation method proposed in this *** research provides the theoretical basis for choosing the technology of pressure relief gas drainage and designing the parameters of construction.

关键词： Remote mining overlying strata Gas channel expansion Gas flow Control action Key strata