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Table of Content

    25 November 2017, Volume 39 Issue 11
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    Steam turbine stative blade tail spray dehumidification numerical investigation
    LI Yimin1, WANG Baoming2, ZHOU Zhongning1, ZHANG Guojie1
    2017, 39(11):  1-4. 
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    To solve the problem of steam turbine end stage runner wet steam, a numerical method for end stage static blade dehumidification structure design was introduced. The 20th stage runner phase change process was simulated. Tail spray dehumidification structure with different width gap was designed. The condensation process in runner was explained by nucleation theory and droplet growth model. Otherwise, tail spray dehumidification structure is effective, and performance best when the gap is 0.4mm wide.
    Numericalcalculationbased centrifugal fan bladeless guide improve study
    CHEN Wei
    2017, 39(11):  5-9. 
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    The numerical simulation software, Fluent, was utilized to improve centrifugal fan bladeless guide and its optimum working condition. The model of bladeless guide was built. The main variates are volute width and volute opening. After meshed in Gambit, the inlet flow rate was adjusted under a given working condition. Based on aerodynamic numerical simulation and relative formula, resistance coefficient and rotation coefficient, which would be used to study bladeless guide, were obtained. The result indicated that increase of flow rate ratio, volute width and volute opening will help to reduce resistance coefficient.
    Numerical simulation of combustion in a 40t/h circulating fluidized bed boiler
    YANG Quan
    2017, 39(11):  10-12. 
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    Numerical simulation is one of the tools to study gassolid two phase flow. The method of numerical simulation was adopted to study the combustion of 40t/h circulating fluidized bed boiler. In furnace velocity field distribution was calculated. The treatment of air distributor uneven air intake was indicated based on the result of air flow field analysis. Secondary air inlet was improved.
    Xiaojihan Coal Mine 11215 fully mechanized working face secondary mining influence roadway advanced support scheme study
    YANG Jing, LIU Jianlin
    2017, 39(11):  13-15. 
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    Xiaojihan Coal Mine 11215 fully mechanized working face air return way was affected by the secondary mining. The roadway has different degrees of ceiling plate sank, floor plate plumped, two side wall deformation conditions, serious influence on the normal advance of fully mechanized working face. By analyzing mining pressure data, the advanced support scheme for 11215 fully mechanized working face air return way was indicated.
    Deep mine water supply pressure reduction and stabilization control technology
    ZHANG Yong
    2017, 39(11):  16-19. 
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    Comprehensive solution of multiple horizontal water supply and low level water supply overpressure was indicated. Numerical modeling analysis of pipeline pressure fluctuation was carried out by hydromechanics software. By comparing fluid field pressure fluctuation, the fluctuation was controlled less than 20% of normal flow rate. The result of numerical modeling provided theoretical basis for selection of valve pressure rating and closing time. Fluctuation of water flow in pipeline was eliminated. Leakage of working face water supply system connections was eliminated.
    Coal mine main inclined shaft belt conveyor improvement technology
    CHANG Wenhao
    2017, 39(11):  20-21. 
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    With the capacity increasing of Buliangou Coal Mine, to satisfy the capacity requirement and increase safety factor, main inclined shaft belt conveyor was technically improved. The improvement plan and checking process was introduced. Which could be referred by similar problem.
    The retrofit design of the circulating fluidized bed cyclone separator
    LIU Yunfeng
    2017, 39(11):  22-25. 
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    A model of a cyclone separator is built by using Gambit, and the mesh model of the cyclone separator is generated. By numerical simulation of flow field of cyclone separator are internal gas and gassolid twophase flow simulation, after observing the results of numerical simulation can be found in gas velocity into the cyclone after the first increases and then decreases, then around the external cyclone downward movement after the movement to the bottom of the cyclone separator began to move upward along the same direction. In addition, the smaller diameter particles in the cyclone separator have larger turbulence than the larger diameter particles, and the degree of chaotic motion is greater, and the difficulty of separation is also increasing.
    Xiaojihan Coal Mine panel No.13 main roadway design improvement
    LI Humin, LI Pengfeng,LIU Jianlin
    2017, 39(11):  26-29. 
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    To reduce cost and increase benefits, the original mining design was studied from drainage, power supply, transportation, ventilation and other aspects. The main roadway design of panel No.13 was reduced to three from five. This improvement effectively reduced the expansion cost. Production plan was provided accordingly to ensure the capacity achieving design value.
    Application of secondary bolt net spray and anchor cable composite support technology in mine underground main drainage house great section chamber
    LIU Jianlin，CHEN Jiageng
    2017, 39(11):  30-32. 
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    Xiaojihan Coal Mine existing underground main drainage pump house support scheme construction procedure is complicated, construction period is long, and cost is high. The overall mine construction duration and cost is impacted. The support scheme for main drainage pump house and water tank was improved. The secondary bolt net spray and anchor cable composite support scheme was introduced. Mine pressure monitoring result indicated that this support scheme satisfied chamber support requirement, ensured support quality.
    Application of air dome for Kekegai Coal Preparation Plant coal bunker primary discussion
    CHANG Xiangdong, LI Xiangyu, GUO Yunxing
    2017, 39(11):  33-35. 
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    The feature and construction process of air dome was introduced. The technical economy of air dome was compared with traditional silo. Combined with domestic practices, it was inferred that apply air dome plan for Kekegai Coal Preparation Plant is scientifically and economically feasible.
    Basal water coal seam uncovering plan study
    ZHU Nanjing, CHEN Jiageng, NING Peng
    2017, 39(11):  36-38. 
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    According to the geographic report of Xiaojihan Coal Mine, this mine is simple mine in hydrogeology. Water burst happen in vertical ventilation shaft at coal uncovering layer. Water flow is 89m3/h, 2.3MPa. It was proved that Xiaojihan Coal Mine coal seam No.2 is main aquifer. Coalbed water is mainly static water. After improving roadway alignment, adding temporary drainage system and drilling drainage from ground and underground, it was successfully uncovered at aquifer.
    Several types of coal storage equipment in strip storage
    CHENG Wenguang, CAO Yungai
    2017, 39(11):  39-42. 
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    Six type of strip coal storage alignment, for coal handling system, were introduced and compared. The most suitable situation for each type was indicated.
    -31 degrees large downwards inclination belt conveyor application
    LIU Xiuzhan, YAN Xin’an
    2017, 39(11):  43-45. 
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    Based on the example of Shanxi Shuozhou Pinglu District Xialiyuan Coal Industry Company Limited, the implementation of -31 degrees large downwards inclination belt conveyor was introduced. It was indicated that large downwards inclination belt conveying can be realized with soft start and proper acceleration, brake and tension device.
    Coal mine equipment point inspection and regular repair management mode discuss and application
    LI Weisheng, HAO Miaojin
    2017, 39(11):  46-48. 
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    The management of point inspection and regular repair in Inner Mongolia Buliangou Coal Industry Company Limited was introduced. By implementing point inspection and regular repair on coal mining machinery, equipment status was fully controllable. Hidden danger and failure rate was reduced. This management mode was widespread in every coal mining companies in Huadian Coal Industry Group Company Limited.
    Internetofthingsbased underground minecar tracking system and application
    HAN Kaijun，TANG Zhizhang, LIU Jinsong, LI Qiang
    2017, 39(11):  49-51. 
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    With the increasing of exploration depth, underground transportation became busier，roadway became more and more complicated, and longer. Due to hard to wiring, low informatization level and low visualization level, an internetofthingsbased underground minecar tracking system was studied and designed. This system made up the lack of surveillance system, and effectively increase production efficiency, reduced accident rate, downsized the crew and ultimately increase economical efficiency.
    Super high seam roadway bottom driving working surface through geological structure support technology
    MENG Xianglong1,YANG Baozhi2,LI Ruixin2
    2017, 39(11):  52-53. 
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    Due to super high seam located at shallow mining depth and bedding development, Buliangou Coal Mine’s ceiling plate and side wall cracked seriously. Surrounding rock is hard to control. After applied Wshape steel trip to change surrounding rock surface stress distribution, and shorten anchor cable interval, support rigidity was increased. Tectonic region was successfully passed.
    Application of pure titanium flue gas duct expansion joint in thermal power plant wet desulphurization analysis
    XING Hao, ZHANG Wei, ZHANG Yuanqing
    2017, 39(11):  54-56. 
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    Thermal power plant desulphurization flue gas duct usually connected to boiler flue gas duct. After ultralow emission reconstruction, temperature of desulphurized flue gas is low and has stronger corrosivity. Take the example of Huadian Luohe Power Generation Company Limited, the feasibility of applying pure titanium flue gas duct expansion joint was analyzed. This reconstruction was implemented. Which could be referred by similar unit.
    Xialiyuan Coal Industry 40101 fully mechanized caving face roof water control technology
    ZHANG Shitong, MENG Haixiang, HUO Chang, YANG Yang, WANG Kai
    2017, 39(11):  57-58. 
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    Hydrogeological condition of Xialiyuan Coal Industry 40101 fully mechanized caving face roof overlying strata was analyzed. Combine with geophysical prospecting, drilling exploration and chemical prospecting, waterrich abnormal area was determined. Water burst source was verified. Working face water inrush was prevented.
    Xiaojiawa Coal Mine small rock pillar over interchange construction safety technology study
    AN Fengcun, YU Jie, WANG Lei, ZHANG Xiaodong
    2017, 39(11):  59-60. 
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    Over roadway small rock pillar interchange construction technology is profound and beneficial in coal mining. By applying comprehensive support of advanced pipe shed, rock bolt, meshes and 25U steel support, Xiaojiawa Coal Mine 211304 working face was interchanged with normally operated working area No.21 downwards conveyor. Interlayer is 1.7m thick and 15m wide. Construction section achieved 20.1m2. This construction technology is precious and can be referred by similar project.
    Lubrication for coal mine machinery
    HOU Baogui
    2017, 39(11):  61-32. 
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    In the operation and use of coal mining machinery, lubrication is an important link, and there is still a great shortage of lubrication work in coal mining machinery. According to the mechanical characteristics of lubrication work, select the appropriate lubricant, add or replace regularly, and follow the operating rules in this process to make the equipment work properly. The lubrication management and lubrication precautions are discussed in this paper.
    Hydraulic support top beam collisionprotection device reproduce improvement
    ZHANG Junxing
    2017, 39(11):  63-64. 
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    Hydraulic support top beam collisionprotection device was provided for prevent collision between hydraulic support and coal cutter. This device is very likely damaged and very hard to repair. During maintenance of hydraulic support, top beam collisionprotection devicewas remanufactured. The selection of material and welding, and operation affected the lifespan of device.
    Hole collapse causes and prevention measurements discussion
    ZHU Yangkui
    2017, 39(11):  65-65. 
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    In the process of coal mine production, the occurrence frequency of drilling accidents caused by the collapse of the hole, abnormal changes under the objective geological conditions or the improper technical measures under the subjective conditions are liable to cause all kinds of borehole accidents. Through the analysis of the causes of drilling collapse, the reasonable measures and methods are developed to eliminate the accident in time and to realize normal drilling.
    Hydraulic support column and jack weeping cause analysis and improvement
    JING Hao
    2017, 39(11):  66-67. 
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    Column or jack weeping is the main reason caused hydraulic support failure. The weeping of column and jack was analyzed from design, machining, assembly, operation and other aspects. Improve method was indicated.
    Super high seam fullmechanized face dual removing gateway alignment discussion
    YANG Xiaoqiang
    2017, 39(11):  68-69. 
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    In multiple roadway and multiple removing process, the alignment of removing gateway is critical to removing. Inner Mongolia Buliangou Coal Industry Company Limited attempted put removing gateway close to end mining influence area, and caused ceiling plate sank and other phenomena. Difficulty of equipment removing was increased. After analyzing, advices for removing gateway were provided. The safety and rapidity removing was ensured.
    Selective analysis of raw material methanol source in methanol processing project
    DU Fangyan,WANGZhaoxia,DU Mingming
    2017, 39(11):  70-72. 
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    To confirm the rationality of to buy methanol or to build coaltomethanol plant, the production capability in 3 to 5 years of 22 methanol factories in 700km range was investigated and analyzed. It was indicated that to build a coaltomethanol plant would be more rational.
    Importance of three machines and one support five clean and five inspect importance brief analysis
    ZHANG Bo
    2017, 39(11):  73-74. 
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    Coal cutter, scraper conveyer, transfer conveyor and hydraulic support are the most important equipment for underground coal mining. Maintenance is necessary for these equipment before removed to next working face. The duration and quality of maintenance impact the production of next working face. Standardized maintenance procedure helped improving duration and quality of maintenance. The importance of three machines and one support five clean and five inspect was analyzed. A rapid, simple and highquality approach of mining machinery maintenance was provided.
    Intelligent management of comprehensive automation and digitalized mine
    TANG Zhizhang, LI Qiang, LIU Jinsong, JIA Guanjun
    2017, 39(11):  75-76. 
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    Comprehensive automation and digital mine is the developing direction of mining technology. Intelligent management of mining technology is developed very positively. This is the opportunity for manufacturer to improve technology and product transition. Moreover, this indicated the direction of mining technology. This paper introduced the digital mining construction process of Shiquan Coal Industry. The concept of “integrated ground conduct, integrated control in control room and insite inspection” was realized.
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