high efficiency and multi function coal and soft rock undergr

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  • China Underground Mine Drill, China Underground

    high efficiency and multi function coal and soft rock underground mine drilling Shandong Shante Heavy Industry Machinery Co., Ltd. US 46000 Piece

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  • coal mining high voltage, coal mining high voltage ...

    high efficiency and multi function coal and soft rock underground mine drilling. 46,000.00 Piece. 1 Piece (Min. Order) Shandong Shante Heavy Industry Machinery Co., Ltd. CN 6 YRS. Contact Supplier. 1/6. High efficiency best quality sawdust/wood chips/silica sand/coal rotary drum dryer, three cylinder dryer. 6,500.00-8,000.00 Piece. 1.0 ...

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  • High-efficiency and multi-function blue fluorescent ...

    2008-10-1 · We demonstrate one high-efficiency blue fluorescent material, N-(4-((E)-2-(6-((E)-4-(diphenylamino)styryl)naphthalen-2-yl)vinyl)phenyl)-N-phenylbenzenamine, with an emissive peak of 472 nm and the hole-transporting property speculated from different devices.It can function either as the single emissive layer or as the dye doped in N,N′-dicarbazolyl-4-4′-biphenyl (CBP).

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  • Key technologies and engineering practices for soft

    2020-11-1 · Selection framework of the fully mechanized equipment for soft-rock protective seam. Mudstone was the main component of the soft-rock working face. Mudstone has a higher capacity (i.e. density, 2500 kg/m 3) in comparison with coal (1350 kg/m 3 ), resulting in high loads on the cutting and transportation equipment.

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  • “HERCULES: HIGH EFFICIENCY AND COMPACT

    Start date: Dec 1, 2015 | “HERCULES: HIGH EFFICIENCY AND COMPACT ENERGY STORAGE SOLUTIONS FOR MULTI-FUNCTION LASER GUIDED VEHICLES CONTROLLED AND MONITORED USING SMART ICT LEAN-LOGISTICS ...

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  • Preparation of composite high-efficiency dust

    Synthesis and performance of a novel high-efficiency coal dust suppressant based on self-healing gel Environ Sci Technol , 54 ( 13 ) ( 2020 ) , pp. 7992 - 8000 , 10.1021/acs.est.0c00613 CrossRef View Record in Scopus Google Scholar

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  • Application and development of hard rock TBM and

    2016-8-1 · High in-situ stress in deep ground and soft rock formation constitute the basic condition of squeezing deformation (Hoek and Marinos, 2000, Hoek, 2001, Barla, 2001). The initial stress in surrounding rock mass changes with the disturbance of TBM excavation, leading the deformation from damage-dilatation to fragmentation-bulking via failure in surrounding rock masses before and after the …

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  • Multi-criteria comprehensive energy efficiency

    2020-6-1 · 1. Introduction. Approximately 4.6 billion tons of coal equivalent were consumed in China in 2018, and from that over 60% was used in power generation and steel industry [].Coal-based generation accounts for approximately 40% of global energy supply and is estimated as a key role in the energy strategy [2,3].However, SO 2, NOx and particulate matter (PM) exhausted from burning coal have …

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  • The integrated drainage technique of directional high ...

    2020-11-1 · The drainage technique of RER has been applied in many mines in China ().According to domestic researches on the drainage effect and gangue emission of over 40 practical cases of RER, figures show that the extraction amount is within the range 84,000–72,600 m 3 /d. The gas extraction amount accounts for 4.7%–11.2% of the total gas emission to the working face (Szlązak et al., 2014).

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  • China Energy Ningxia Coal Industry Group boosts

    China Energy Ningxia Coal Industry Group Co., Ltd. (China Energy Ningxia Coal Industry Group) was established on 18 January 2006, specializing in coal and coal-to-oil chemical industry. Its business scope covers deep processing and comprehensive utilization of coal, mechanical manufacturing and maintenance, energy engineering construction, etc.

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  • SCGP Pulverized Coal Burner For High Efficiency

    SCGP Pulverized Coal Burner For High Efficiency Syngas Production . SCGP coal burner is the critical equipment of shell coal gasification process and functions to deliver pulverized coal and oxygen and steam into the coal gasifier, which are atomized in the high temperature high pressure environment as desired by the gasification process in order to achieve high efficiency gas production. The ...

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  • Key technologies and engineering practices for soft

    2020-11-1 · The simulated soft-rock working face was 100 m in length and 180 m in thrust length. The stress changes of coal-rock body at different interlayer spacings (20, 40, 60, 80, and 100 m) were analyzed. According to III1 mining area comprehensive histogram, the physical and mechanical parameters of coal-rock seam in the model are listed in Table 2.

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  • An automatic decision approach to coal–rock

    2017-4-17 · Since the 1940s, the top coal caving technology (TCT) was first applied in Russia, it has been widely applied under different coal conditions especially thick coal seam due to its high production, low cost, and high efficiency [].In order to realize the caving automation, coal and rock need to be recognized, so that the operator of hydraulic support can automatically control the start-stop of ...

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  • Global energy consumption due to friction and wear

    2017-11-1 · The energy used in mining is dominated by two sources, electrical power and diesel fuel. In addition coal and natural gas, and to a minor extent also gasoline and wind power are used. Diesel fuel is traditionally and still today much used energy source in surface mining because of the mobility, high efficiency and flexibility of diesel engines.

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  • The sustainable development of coal mines by new

    2020-6-3 · 1. Introduction. China is the largest coal consumer in the world, and its coal consumption accounts for more than 60% of primary energy consumption [].However, with the high strength exploitation for past decades, coal resources are quickly exhausted, especially in China's eastern provinces, such as Jiangsu, Henan and Shandong.2

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  • Study on Roof-Coal Caving Characteristics with

    2019-4-18 · With mining technology and mechanization degree being improving, fully mechanized caving mining technology (FCM) has become a main method for thick coal seam extraction in China. However, roof-coal caving characteristics in turn restrict its recovery efficiency, especially for the coal seam with complicated structure (CCS), that is, the coal seam comprises hard or soft coal and gangue.

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  • Bituminous Coal Characteristics and Applications

    2021-6-7 · Sand (Hall et al. 2010), coal (Mao et al. 2015), concrete (Mao et al. 2019), and sandstone (Renard et al. 2018) have been studied using the L-DVC technique, and a standard L-DVC code, Tomowarp, has been used by many rock physicists (Tudisco et al. 2017). By contrast, the G-DVC uses a globally shared set of parameters based on finite elements ...

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  • Evaluation of Global and Local Digital Volume

    2021-6-3 · In recent years, China’s coal industry has faced a gradual decline in market demand, and companies have large inventories that are difficult to digest. At the same time, the global energy market is sluggish and market prices continue to fall, making the development of the domestic coal industry more difficult. In addition, limited by the current environment and resources, China’s ...

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  • Environmental cost control of coal industry based on

    2019-11-18 · PT-FREE COUNTER ELECTRODE FOR DYE-SENSITIZED SOLAR CELLS WITH HIGH EFFICIENCY YUN, SN(材料学院,云斯宁);HAGFELDT, A;MA, TL ADVAN MATER 26 (36): 6210-6237 SEP 24 2014 MATERIALS SCIENCE 265 3 THERMAL COMFORT

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  • A high-efficiency and multi-function sand washer

    2018-6-4 · A high-efficiency and multi-function sand washer. Posted: 2018-06-04 The high-efficiency and multi-function sand washing machine is designed with energy saving and environment protectional, the equipment is composed of spiral sand washer, impeller sand washer and find sand recycling machine, with the characteristics of washing, dewatering, screening and so on, which can effectively remove the ...

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  • What are the types of coal? - USGS

    2009-4-26 · Aimed at the low mining efficiency in deep multi-seams because of high crustal stress, high gas content, low permeability, the compound “three soft” roof and the troublesome safety situation encountered in deep level coal exploitation, proposed a new idea of gob-side retaining without a coal-pillar and Y-style ventilation in the first-mined key pressure-relieved coal seam and a new method ...

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  • Derrick – Coal desliming, scalping, sizing, fines

    2021-2-8 · rock breaking efficiency of multi-jet bit was studied by experimental method, which can provide guidance for design of multi-jet bit in radial horizontal drilling. 2. Structure design of multi-jet bit 2.1. Working principles of multi-jet bit The front and back jet produced by self-propelled multi-jet bit are both multiple jets. The main function

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  • Technique of coal mining and gas extraction without

    2020-6-10 · We combine experimental data, FLAC3D numerical simulation results, and on-site industrial tests to study the problem of coal pillar size design in longwall entry. The Zhaozhuang coal mine located in Changzhi City, Shanxi Province, China, is used as a case study. We use an inversion calculation of the double-yield constitutive model to improve the reliability of the simulation results.

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  • DESIGN AND ROCK BREAKING ChARACTERISTIC

    This study employs the mechanical vibration and acoustic waves of a hydraulic support tail beam for an accurate and fast coal-rock recognition. The study proposes a diagnosis method based on bimodal deep learning and Hilbert-Huang transform. The bimodal deep neural networks (DNN) adopt bimodal learning and transfer learning. The bimodal learning method attempts to learn joint representation by ...

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  • Coal pillar size design and surrounding rock control ...

    2021-1-5 · 189.High Efficiency (15.8%) All-Polymer Solar Cells Enabled by a Regioregular Narrow Bandgap Polymer Acceptor 作者: Fu, Huiting ... 274.Mechanical Properties and Energy Dissipation Characteristics of Coal-Rock-Like Composite Materials Subjected to ...

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  • Coal-Rock Recognition in Top Coal Caving Using

    The coal mine safety dynamic diagnosis system is based on cloud computing, the Internet of things, data mining technology as the support, based on various safety production regulations and specifications formulated by the industry, group, and mine, combined with comprehensive automation, online monitoring (water, fire, gas, roof, etc.) and ...

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  • Design of mine safety dynamic diagnosis system

    2019-11-18 · PT-FREE COUNTER ELECTRODE FOR DYE-SENSITIZED SOLAR CELLS WITH HIGH EFFICIENCY YUN, SN(材料学院,云斯宁);HAGFELDT, A;MA, TL ADVAN MATER 26 (36): 6210-6237 SEP 24 2014 MATERIALS SCIENCE 265 3 THERMAL COMFORT

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  • Finite-difference based response surface

    2021-1-27 · The proposed model appears to give a high goodness of fit with the accuracy of 0.90. ... and mechanisms of composite coal–rock specimens. ... pattern of a coal mine roadway within soft rocks—a ...

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  • Changes and Migration of Coal-Derived Minerals on

    2021-3-12 · It is unclear that the changes and migration of coal-derived minerals on the graphitization process of coal. The Taixi anthracite is the study sample of the changes and migration mechanisms of coal-derived minerals during graphitization. Raw coal and different temperature-treated products were collected and analyzed by X-ray diffraction (XRD) to reflect the variation trends of the crystal ...

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  • X-RAY DETECTOR

    2020-6-18 · High Performance at Low Cost Si-PIN Detector FET Mounting Stud 2-Stage Cooler Temperature Be Window Monitor Model XR-100CR is a high performance X-Ray Detector, Preamplifier, and Cooler system using a thermoelectri-cally cooled Si-PIN Photodiode as an X-Ray detector. Also mounted on the 2-stage cooler are the input FET and a novel feedback circuit.

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  • International Journal of Oil, Gas and Coal Technology ...

    It is an urgent task for our country to deepen air pollution control, and construct an overall economic, safe and clean energy supply system. The electricity heating, compared with traditional coal-fired heating, has benefits, including high thermal efficiency, high degree of automation, safety and reliability, and flexible operation modes.

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  • International Journal of Computational Intelligence ...

    COVID-19 is an infectious disease caused by severe acute respiratory syndrome (SARS)-CoV-2 virus. So far, more than 20 million people have been infected. With the rapid spread of COVID-19 in the world, most countries are facing the shortage of medical resources. …

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  • Water treatment plants Providing clean and safe drinking

    2021-2-15 · High efficiency VSD-motor package lowers energy between 20 to 60 percent and reduces carbon dioxide emissions. IE4 and higher efficiency class motors are among the most efficient available, contributing to further energy reduction. Synchronous reluctance motors (SynRMs) reduce total losses by up to 40 percent, bringing optimal efficiency and ...

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  • Engineering | CAE

    The results show that fault-induced coal burst is triggered by the superposition of high static stress in the fault pillar and dynamic stress from fault reactivation. High static stress comes from the interaction of the fault and the roof structure, and dynamic stress can be ascribed to FRMSS and FRSDS.

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  • Crystallite Structure Characteristics and Its Influence

    2021-3-12 · The ability of coal to adsorb methane depends on the coal microstructure; however, the research on its exploration is still underway. In this paper, a new method was adopted to investigate the evolution characteristics of the crystallite structure of eight different rank coals and its influence on the methane adsorption capacity. The crystallite lattice parameters, including d002, Lc, La, Nave ...

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  • Non-destructive inspection on anchorage defect of

    In this paper, the simulation approach and exergy analysis of multi-stage compression high temperature heat pump (HTHP) systems with R1234ze(Z) working fluid are conducted. Both the single-stage and multi-stage compression cycles are analyzed to compare the system performance with 120°C pressurized hot water supply based upon waste heat recovery.

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  • DESIGN AND ROCK BREAKING ChARACTERISTIC

    2015-9-28 · rock breaking efficiency of multi-jet bit was studied by experimental method, which can provide guidance for design of multi-jet bit in radial horizontal drilling. 2. Structure design of multi-jet bit 2.1. Working principles of multi-jet bit The front and back jet produced by self-propelled multi-jet bit are both multiple jets. The main function

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  • Fully mechanized coal mining technology for thin coal

    2018-2-3 · ENERGY EXPLORATION & EXPLOITATION· Volume 29 · Number 2 · 2011 pp. 169–178 169 Fully mechanized coal mining technology for thin coal seam under complicated geological conditions Guimei Wang1*, Shanlin Jiao1 and Guangxing Cheng2 1College of Mechanical and Electrical Engineering, Hebei University of Engineering, Handan 056038, China

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  • International Journal of Oil, Gas and Coal Technology ...

    It is an urgent task for our country to deepen air pollution control, and construct an overall economic, safe and clean energy supply system. The electricity heating, compared with traditional coal-fired heating, has benefits, including high thermal efficiency, high degree of automation, safety and reliability, and flexible operation modes.

    Get Price
  • Study on Intelligent Identification Method of Coal Pillar ...

    2020-1-8 · Finally, the target output layer carries out the optimal coal pillar value of the optimization layer to realize the intelligent identification system of coal pillar stability with more intelligence, high efficiency, safety, reliability, and green environmental protection. 3. Mechanical Model Analysis and Width Calculation of Coal Pillar 3.1.

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  • 4200 SM WIRTGEN products | Wirtgen

    Diverse studies and tests show that surface miners offer considerable advantages in terms of both economic efficiency and the final product. Two type 4200 SM Wirtgen surface miners are bringing light to South Texas and Northern Mexico. A 4200 SM mines hard coal in …

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  • Volume-8 Issue-9 | International Journal of Innovative ...

    2021-6-27 · International Journal of Innovative Technology and Exploring Engineering (IJITEE) covers topics in the field of Computer Science & Engineering, Information Technology, Electronics & Communication, Electrical and Electronics, Electronics and Telecommunication, Civil Engineering, Mechanical Engineering, Textile Engineering and all interdisciplinary streams of Engineering Sciences.

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  • International Journal of Energy Research: Early View

    A multi-objective optimization problem has been defined for CO 2 utilization of direct synthesis of DME plant. The MOOP results suggest that the higher the DME production rate, the lower net CO 2 emission to the air. In addition, the process with a higher DME production rate has a higher carbon efficiency and power production from the produced steam.

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  • P&H 4100XPC Electric Rope Shovel - Surface Mining ...

    2018-11-5 · This approach further develops the work on efficiency evaluation and on estimation of efficient production frontiers known as data envelopment analysis (DEA). We also employ the model to provide efficient input and output targets for DMU managers in a way that specifically accounts for the fixed nature of some of the inputs or outputs.

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  • Efficiency Analysis for Exogenously Fixed Inputs and ...

    2020-11-10 · By 2050, shale gas production is expected to exceed three-quarters of total US natural gas production. However, current unconventional hydrocarbon gas recovery rates are only around 20%.

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