Results 71 to 80 of about 4,725,858 (203)
Meitan kexue jishu, 2023 During the driving of the fully mechanized driving face of the hydrogen sulfide coal roadway, due to the ventilation effect of the roadway, it is very easy to cause hydrogen sulfide gas accumulation and overrun in the front area of the driving face.
WANG Fuzhong +5 more
doaj +1 more source
Energy Science &Engineering, EarlyView.As the sublevel height increases, the top‐coal recovery amount gradually increases, but both the top‐coal recovery rate and the thickened top‐coal recovery rate show a downward trend, and the decline in the top‐coal recovery rate is gradually increasing. The comparison indicates that the optimal sublevel height is 20 m.
Hongsheng Tu +4 more
wiley +1 more source
, 2021 Based on the mining practice of Shendong Bulianta Coal Mine, this paper analyzes and summarizes the low-oxygen problems in the mining process of the fully mechanized working face in the overlying large goaf of the close distance coal seams, and finds ...
TIAN Chen, LI Bin
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Analysis of lump coal rate on fully mechanized coal mining face based on discrete element method
Gong-kuang zidonghua, 2019 In view of problem that existing lump coal rate research method cannot accurately express behavior of coal particles, an analysis method of lump coal rate on fully mechanized coal mining face based on discrete element method was proposed.
CHEN Li, ZHANG Yan
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Energy Science &Engineering, EarlyView.This study systematically investigates the fracture development mechanisms of water‐isolating soil layers under the coupled effects of repeated mining and groundwater seepage during the downward mining of shallow‐buried coal seams. The findings provide a theoretical basis for evaluating stratum stability and preventing roof water inrush.
Tao Yang +7 more
wiley +1 more source
Discussions on Some Security Mining Problems of Fully-Mechanized Top Coal Mining in “Three Soft” Large Inclined Angle Working Face [PDF]
, 2011 This paper studies insecure factors of fully-mechanized top coal mining in “three soft” large inclined angle working face, which have impacted the normal generation badly, including rib spalling, roof fall and equipment slide, etc.
Yanli, Zhu +4 more
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Research of gas movement law in goaf with parallel double U-shape ventilation mode
Gong-kuang zidonghua, 2014 In order to analyze and master gas distribution and movement law in goaf with parallel double U-shape ventilation mode, a CFD model was established according to characteristics of parallel double U-shape ventilation system of fully mechanized coal mining
HAO Yabing +3 more
doaj +1 more source
Remote fault diagnosis system of fully mechanized mining equipment group based on cloud platform
Gong-kuang zidonghua, 2021 The currently developed remote fault diagnosis systems for fully mechanized mining equipment are mostly for single-machine equipment such as coal shearers, scraper conveyors and belt conveyors, and for expert remote guidance and maintenance systems based
LI Xu +4 more
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National Policy Coherence Counts for Reducing Inequality in Global Climate and Development Agendas
Sustainable Development, EarlyView.ABSTRACT International institutions promote policy coherence as crucial to the effective and fair implementation of global sustainability agendas, though the evidence for its benefits is slim. We present here the first systematic cross‐country dataset on the consequences of national government efforts to promote policy coherence for vulnerable groups ...
Katherine Browne +10 more
wiley +1 more source
Meikuang Anquan, 2020 In order to improve the top coal resources at both ends of fully mechanized top coal caving face in extra-thick seam and the recovery rate of coal resources during the initial caving, reduce the impact of initial weighting on the working face during the
SUN Zhenping
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