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August 30,2010
Volume 3,Issue 16
Pages -
Subject Area:Coal Energy,Energy Systems Engineering, Energy Economy,Geographic Information System,Geodesy

Title: Dynamics simulation on start operating performance of scraper conveyer

Authors: SHI Jianguo, LIU Keming, MAO Jun
PP: 1720-1724
Abstract: The dynamics model and the dynamics differential equation of scraper conveyer were established in this paper. Through dynamics simulation on direct starting process and controllable starting process of scraper conveyer, the changing law of the tension and speed of the chain under different operating performance was studied. The corresponding result is that the tension of controllable starting process is reduced 26 667% compared with that of the full voltage starting process. It is proved that the start tension of chain can be decreased and its reliability can be increased by adopting controllable starting.
Keywords: mining machinery; scraper conveyer; starting; dynamics; simulation

Title: Coal gangue recognition system reseach based on gray

Authors: LU Dandan, WANG Jie
PP: 1717-1719
Abstract: On the basis of analyzing the principle for sorting coal gangue based on gray scale, by using image processing and pattern recognition technology, this paper designed a coal gangue) sorting equipment based on the differences of coal and gangue in the gray differences. The experiment results show that: although the system still has some problems needing to be researched and solved, it is practical and worth to be widely spread.
Keywords: mineral processing; gangue; gray; image processing; automation; separation

Title: The application of the new composite flotation reagent in coal flotation

Authors: CHEN Yu, HE Weijun, ZHANG Ruiwen
PP: 1713-1716
Abstract: The paper describes that the consumption of the conventional flotation reagent is too large and it has worse performance in the slime flotation test. Comparing the flotation performance between the composite flotation reagent exploited by the Ekofol company and the conventional flotation reagent by a type of flotation tests and timed release analysis experiments. The results show that the composite flotation reagent achieves the best flotation result and its consumption is less than the conventional flotation reagent.
Keywords: mineral processing; slime; flotation reagent; flotation

Title: Development method of a new cross-platform mining application program

Authors: LI Tao, REN Youkui, WANG Tao, LOU Peijie
PP: 1707-1712
Abstract: Based on a variety of research in the method of mining application development, this paper raises a new method which develops cross-platform mining software with free open-source software. Namely, using the program-oriented graphics software which has powerful computing capabilities like Asymptote to complete calculations and drawings, using Tcl/Tk graphical user interface to provide a convenient and flexible interface for end-user. Compared with the traditional application development based on VB and AutoCAD platform, this method has the advantages of easy configuration, no copyright limitation, less cost and across-platform operation. By the design and implementation of the program that determine the protect pillar, the effectiveness and flexibility of the method are proved.
Keywords: mining engineering; cross-platform; programmable drawing language; Tcl/Tk; vertical section method

Title: Three-underground coal mining analysis

Authors: LI Zhengjie, LU Guobin, ZHANG Daming, LIU Shanzhong
PP: 1701-1706
Abstract: For the domestic practical problems about a large amount of coal under the pressure of buildings, water bodies, railway in this stage, this paper briefly introduces the different methods and technical means at home and abroad in addressing the three underground pressure of coal issues, and arises different optimization measures. Various coal enterprises can also use them as a reference to exploit pressure of coal mining reasonably, in conjunction with its own conditions and technological advantages in order to achieve the purpose of full use of resources and safe coal mining exploration safely.
Keywords: mining technology; buildings; water; railway; optimizing mining

Title: Numerical simulation research on stagger arrangement roadway layout

Authors: CUI Taihe
PP: 1696-1700
Abstract: Stagger thick seam mining roadway layout can improve the recovery rate of top coal. The paper performs numerical simulation to a mine by UDE-3.10 numerical simulation software, analyzes the movement and stress distribution of overlying strata, and obtains the result that the stress at two ends of the work surface are higher, which increases release rate of the top coal.
Keywords: mining engineering; stagger arrangement roadway layout; UDEC-3.10; numerical simulation; stress distribution

Title: Study on elastic modulus for jointed rock mass under excavation disturbance

Authors: YAO Gaohui，WANG Yiming，XIA Hongchun
PP: 1690-1695
Abstract: It is often difficult in engineering practice to make a direct in situ measurement of the elastic modulus of jointed rock mass. As an alternative method, the rock elastic modulus measured in the lab is generally used to indirectly determine the elastic modulus of jointed rock mass. Based on consideration of excavation disturbance to tunnel surrounding rock, study on elastic modulus was carried out under two kinds of occurrence condition: no ground water or fissure water containing. Firstly, traditional geological strength index (GSI) method was improved by introducing joint spacing Js, and GSI values were determined by quantitative structural parameters of rock mass. By use of expanded Hoek Brown criterion, and introduction of disturbance factor D, the elastic modulus of rock mass not taking groundwater factor into account can be calculated. The strain coupled hydraulic model was proposed to establish the deformation coordination relations under excavation disturbance between the fracture and the rock blocks. Rock mass elastic modulus was calculated based on the water inflow and the reduction factor of elastic modulus. Field application of Bainiuchang mine shows that the above mentioned method can more accurately reflect the jointed rock mass elastic modulus, which is worth recommendation in similar projects.
Keywords: mining engineering; Hoek-Brown criterion; geological strength index; reduction factor of elastic modulus; hydraulic conductivity

Title: Setting load and stope control analysis of Sihe mine long face with large mining height

Authors: HAN Junxiao, LI Huamin, XIONG Zuqiang, WANG Wen
PP: 1680-1684
Abstract: In order to protect face roof well and control stope ore pressure, this paper analyzes the relationship between the setting load force and work resistance using regression analysis method, and analyzes the effects of the setting load on the stope mining pressure using on site observation approach. The analysis results show that: the work resistance increased accordingly as the setting load increased, and the support work resistance as the increase of the support setting load, the support work resistance performed function very fast, and it was conducive to roof management. So measures must be taken to improve the support setting load to ensure the supports in force up to the required value.
Keywords: coal energy; hydraulic support; setting load; working resistance

Title: Influence of the heat accumulation on photosynthetic bacteria hydrogen production

Authors: JING Yanyan, ZHANG Xiangfeng, YUE Jianzhi, LI Gang, SHEN Xiangwei, ZHANG Quanguo
PP: 1674-1679
Abstract: The influence of different heat accumulation resulting from external factors on hydrogen production of photosynthetic bacteria was investigated in this paper. The results indicated that heat accumulation improved hydrogen production of photosynthetic bacteria when the initial temperature was low. However, when the temperature was higher than 30℃, it did not. Heat accumulation showed an upward trend with light intensity increasing from 500 to 3 000 lx，and was conducive to the improvement of hydrogen production. In other words, the more heat accumulation, the more hydrogen production yields. When the scope of inoculation was from 5% to 50%, heat accumulation was also conducive to the improvement of hydrogen production capacity. When inoculation was 5%, 10%, 20% and 50%, hydrogen production yields increased correspondingly by 43, 89, 103 and 30 mL.
Keywords: agricultural biological environmental and energy engineering; heat accumulation; single factor experiment; photosynthetic bacteria; hydrogen production

Title: Algorithm improvement and verification on theoretical nitrogen washing column plate number in low-temperature liquid nitrogen washing application

Authors: LUO Bohua, ZHANG Cunquan
PP: 1668-1673
Abstract: By combining with some certain low-temperature liquid nitrogen washing process project development and aiming to enhancing the washing efficiency of the core liquid nitrogen column as well as satisfying the specified process indexes, the nitrogen washing column plate number and structure are modified so as to achieve the goal of saving the nitrogen washing column manufacturing cost. By comprehensively taking the column plate efficiency into account and combining the design working condition verification as the theoretical method, the low-temperature liquid nitrogen washing principal and relevant process requirements are introduced first in this study; then the traditional calculation method to the liquid nitrogen column theoretical plate number is presented; moreover, the column plate efficiency and the algorithm are taken comprehensively into account; finally the improved algorithm to the liquid nitrogen column theoretical plate number is put forward and the corresponding verification under the design conditions has been carried out; the comparisons are in good agreement so as that the improved algorithm may obtain the more accurate results and meet the practical engineering design requirements.
Keywords: energy economics；liquid nitrogen washing; theoretical plate number; analysis and improvement; verification

Title: Formation Mechanism and Accumulation Model of Lithilogical Pertroleum Reservoir in Niuzhuang Subsag

Authors: WANG Yong
PP: 1661-1667
Abstract: Based on the hydrocarbon occurrence and source rock analysis of lithologic body reservoir in Niuzhuang subsag of Dongying, this paper directs the formation of oil and gas reservoir of Es3, by using the law of subtle passage system starting with pressure evolution perspective. The result shows that sand lens reservoir are mainly allochthonic, multistage, episodic and replaced migration and accumulation. In the process of regional overpressure releasing, the stratum water and early filled hydrocarbon in high pressure sand lens discharge firstly through the migration pathway and simultaneously the sand lens get the pressure relieved. Because the permeability of sand is far better than the surrounding mudstone and shale’s, its pressure relief is more completed. Along with the facts that high pressure mainly generates in mudstone and shale, the pressure of sand lens is lower than its surroundings before the next releasing. Therefore, the sand lens are favorable for hydrocarbon accumulation.
Keywords: oil and natural gas energy; lithologic body; pressure evolution; subtle passage system; episodic replacement; hydrocarbon accumulation

Title: Evaluation of north district development in Qinhuangdao 32-6 heavy oil field

Authors: QIU Xiaojiao, YAO Yuedong, LIU Tongjing
PP: 1655-1660
Abstract: Based on the data of logging, pressure test, and production etc., split production and get well production profile and productivity contribution with combination of energy analysis, multi dynamic profile analysis, and production methods etc. Using the method of reservoir engineering, the northern reservoir of QHD32-6 oil field has been evaluated from following aspects of producing degree, driving energy, and recovery, etc. The results show that the district has high producing degree of sand reservoirs, sufficient energy supply, and great whole development effect of the oil field, but oil recovery is low because of the special reservoir and the inflexible operating mode. There has room for tapping the potential.
Keywords: oil and natural gas energy; dynamic analysis; comprehensive split production; producing degree of reserves; driving energy; recovery

Title: The investigate of diesel/gas dual fuel engine

Authors: LIU Li, WU Guangyao
PP: 1651-1654
Abstract: From emissions, economy and resource reserves, this paper illustrates the advantages of gas resources relative to petroleum resources, highlights the feasibility that some of the engine converted into dual fuel engine, and describes the limitation of dual fuel engine technology. From the characteristic and economy point of view, it illustrates the advantages of liquefied natural gas (LNG) resource, and introduces a gas supply system of dual fuel engine .Taking Mercedes Benz heavy trucks as example, it makes clear that the feasibility that diesel engine converted into dual fuel engine, and give the signal acquisition method. Compared with the diesel engine, get the fuel substitution rate, economy and energy ratio of dual fuel engine.
Keywords: oil and natural gas energy; dual fuel engine; gas supply system; economy of dual fuel engine

Title: Research on method for snow extraction based on MODIS data

Authors: GUO Lili, LEI Jun
PP: 1646-1650
Abstract: Through the analysis of spectral characteristics of snow, using the moderate resolution imaging spectrometer (MODIS) data in January 2008, Hunan region, based on the research work done by predecessors, the paper puts forward a new method to remove the different types of clouds by the combination of normalized difference snow index (NDSI), normalized difference vegetable index (NDVI) and MODIS band 20, 26, 29, 31 and thus identify the snow in Hunan province. The results of analysis and tests show that the use of this method can effectively identify the snow in Hunan province.
Keywords: photogrammetry and remote sensing technology; snow extraction; normalized difference snow index; spectral characteristics

Title: Establishment and research of TIN based on irregular distributed data

Authors: ZHANG Zhanyang
PP: 1641-1645
Abstract: Establishing of triangulated irregular net work (TIN) triangles is the most commonly encountered problem in digital elevation model (DEM) data processing. Here this paper mainly discusses the guidelines for different mesh network, uses a method to build a TIN, and makes a exploration and research on some possible achieved algorithms. At the same time, it sheds light on the relevant data storage structure of TIN and so on, and draws the conclusion that different algorithms can be selected for building mesh networks according to demands in pratical application.
Keywords: geographic information system; triangulated irregular net work; triangulation criteria; growth algorithm of the triangulation

Title: The current research state of regional land subsidence at home and abroad

Authors: LIU Feng, HUANG Zhangyu, CHEN Xiqiang
PP: 1631-1640
Abstract: Regional land subsidence existing in many places around the world is recognized to be an environmental geological hazard, which is mainly induced by excessive groundwater exploitation. Based on analysis and research of related papers on regional land subsidence at home and abroad, this paper provides a systematic summary of current situation and achievement of regional land subsidence at home and abroad, respectively from the following four aspects, ranging from the genetic mechanism, subsidence detection, prediction model, and control measures. In addition, it is pointed out that mechanisms and models of regional land subsidence caused by other secondary factors need to be strengthened.
Keywords: geodesy and survey engineering; land subsidence; reviews; groundwater; effective stress; intrferometric synthetic aperture radar

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