【作者】 聂文；

【导师】 程卫民；

【作者基本信息】 山东科技大学 ， 安全技术及工程， 2010， 硕士

【摘要】 由于综掘工作面的产尘量较大,远远超过《煤矿安全规程》的规定,因此,从保护现场作业人员职业安全健康以及企业安全生产的角度考虑,必须将综掘工作面的粉尘浓度控制在可允许的范围以内。本文采用理论分析、数值模拟、实验测试及现场应用相结合的方法,提出了综掘工作面封闭式除尘系统,经现场应用取得了较好的降尘效果。建立了单相风流的三维k-ε紊流模型和双相的气相湍流-粉尘颗粒相湍流k-ε-(?)-kp模型,采用混合差分格式和基于同位网格的SIMPLE算法作为气体-粉尘颗粒两相流的数值解法,并利用ANSYS FLUENT软件对综掘工作面采用单一和附壁风筒压抽混合式通风系统的风流场及粉尘流场进行了数值模拟,得出了采用封闭式控尘系统前后综掘面风流场及粉尘流场的变化规律,为综掘工作面封闭式除尘系统的研究提供了理论基础。研究分析了喷嘴的雾化机理和喷雾降尘机理,并利用自行设计、制造的实验装置在模拟综掘工作面真实风速的情况下进行了喷嘴雾化特性实验和喷雾降尘实验,通过对实验数据的分析,确定了各种喷嘴所成雾场的雾滴粒径及雾流结构在不同压力、风速等条件下的规律,得出不同粒径雾滴与之捕获的煤尘粒径的对应关系为ΔD≈0.12·D无尘液滴,并根据实验结果和综掘机尺寸确定孔径分别为1.6mm和2.4mm且含X形导流芯的广角旋口的1#和3#混合式喷嘴为综掘机外喷雾降尘装置喷嘴,供水压力为4MPa。根据高庄煤矿3下506运输巷综掘工作面的生产状况、产尘特点、粉尘分布规律及综掘机外喷雾降尘装置的喷嘴选型、喷雾压力等情况，研究设计了由综掘机外喷雾降尘装置和封闭式抽尘净化装置组成的综掘工作面封闭式除尘系统。现场实测表明,本文设计的综掘工作面封闭式除尘系统具有较好的除尘效果。更多还原

【Abstract】 Dust concentration in comprehensive mechanized heading face must be controlled in a proper range to ensure protecting workers occupational safety and health and enterprise safety production because dust production of comprehensive mechanized heading face is larger, and even exceeds the prescribed limit of "coal mine safety regulation". In this dissertation, closed-end dust-removing system of comprehensive mechanized heading face is proposed, combining theoretical analysis, numerical simulation, experimental measuration and application on-spot. Finally, the field application showed satisfactory results.k-εthree-dimensional turbulence model for single-phase air flow and k-ε-(?)-kp dual phase gas phase turbulent-dust particles phase turbulent model are established, hybrid scheme and SIMPLE algorithm based on collocated grid are numerical solution of two-phase flow for gas and dust particles. Numerical simulation on air-flowing field and dust flowing field in comprehensive mechanized heading face is made by single-hybrid- negative pressure pumps formula and wall-attachment-fan drum closed-end dust-removing and cleaning system through ANSYS FLUENT software, therefore, the change law of air-flowing field and dust flowing field using closed-end dust-removing and cleaning system is obtained in pre and post comprehensive mechanized heading face, and the theoretical foundation for analysis of closed-end dust-removing and cleaning system in comprehensive mechanized heading face is provided.Spray characteristics experiment and spray and dust reduction experiment are finished under simulation real wind speed in comprehensive mechanized heading face by using self-designed manufactured experimental device, and the mechanism of nozzle spray and spray and dust reduction are analyzed. Various nozzles law in spray field of the droplet size spray flow structure under different pressure and different wind speed is determined, the corresponding relation between different droplet size and coal dust droplet size captured isΔD≈0.12·Ddust-free droplet. NO.1 and NO.2 hybrid nozzles containing X style diversion core of wide angle arch with hole diameters of 1.6 mm and 2.4 mm, which are used by spray and dust reduction device in outer fully-mechanized coal winning machine through the experiment result and the size of fully-mechanized coal winning machine, and spray is taking when water pressure is 4MPa.Closed-end dust-removing and cleaning system in comprehensive mechanized heading face that composed of spray and dust reduction device in outer fully-mechanized coal winning machine and closed-end dust-removing and cleaning device is desired according to production situation, dust production feature, dust distributing law, nozzle selection in outer fully-mechanized coal winning machine and nozzle pressure ect. in 3 F 506 haulage roadway comprehensive mechanized heading face of GaoZhuang Coal Mine. Finally, the field demonstration test results show that closed-end dust-removing and cleaning system in comprehensive mechanized heading face have acquired fine dedusting effect.更多还原