【摘要】：綜掘工作面粉塵的運(yùn)移規(guī)律是事關(guān)綜掘工作面粉塵防治原理與技術(shù)的關(guān)鍵科學(xué)問(wèn)題。但在目前研究中,因粉塵運(yùn)移規(guī)律及其變化過(guò)程復(fù)雜,致使粉塵運(yùn)移、擴(kuò)散及分布的變化規(guī)律及其相互關(guān)系等基本問(wèn)題尚不清楚。本文在前期對(duì)氣固兩相流模擬研究的基礎(chǔ)上,提出開(kāi)展綜掘工作面粉塵顆粒運(yùn)移規(guī)律的系統(tǒng)研究:首先建立矩形巷道幾何模型,采用了歐拉方法把顆粒相當(dāng)擬流體來(lái)處理,研究了顆粒相在綜掘巷道的運(yùn)移分布特征,得到了送風(fēng)速度、產(chǎn)塵量和通風(fēng)方式對(duì)粉塵顆粒的分布的影響規(guī)律。同時(shí)獲取了巷道內(nèi)三維風(fēng)場(chǎng)的詳細(xì)信息。其次基于CFD-DEM模擬平臺(tái),對(duì)通過(guò)歐拉法獲得風(fēng)場(chǎng)進(jìn)行離散化,采用離散單元法追蹤網(wǎng)格內(nèi)顆粒。對(duì)于顆粒間的碰撞問(wèn)題,基于硬球模型通過(guò)DSMC和修正的南布方法來(lái)解決。研究不同粒徑顆粒的分布規(guī)律,獲得了送風(fēng)速度、通風(fēng)方式對(duì)粉塵顆粒的分布的影響規(guī)律,發(fā)現(xiàn)在一些工況下會(huì)出現(xiàn)顆粒漩渦。最后建立了拱形巷道模型,考慮了綜掘機(jī)對(duì)通風(fēng)的影響,基于Euler-Lagrange方法采用離散相模型,模擬了綜掘面粉塵顆粒運(yùn)移的全過(guò)程以及風(fēng)幕對(duì)粉塵分布的影響,發(fā)現(xiàn)掘進(jìn)機(jī)后方粉塵易發(fā)生沉降,濃度會(huì)升高。研究成果將有助于深刻認(rèn)識(shí)綜掘面粉塵顆粒的運(yùn)移行為本質(zhì),可為綜掘工作面粉塵防治原理與技術(shù)及制定有效的防塵、降塵措施提供更加科學(xué)合理的指導(dǎo)。
[Abstract]:The law of dust movement in fully mechanized working face is a key scientific problem related to the principle and technology of dust prevention and control in fully mechanized working face. However, in the present study, the basic problems of dust migration, diffusion and distribution and their relationship are still unclear due to the complexity of dust migration and its changing process. Based on the previous study of gas-solid two-phase flow simulation, this paper presents a systematic study on the law of dust particle migration in fully mechanized working face. Firstly, the geometric model of rectangular roadway is established, and Euler method is adopted to treat the particle equivalent to pseudo-fluid. The migration and distribution characteristics of particle phase in fully-mechanized roadway are studied, and the influence of air velocity, dust production amount and ventilation mode on the distribution of dust particles are obtained. At the same time, the detailed information of the three-dimensional wind field in the tunnel is obtained. Secondly, based on the CFD-DEM simulation platform, the wind field obtained by Euler method is discretized and the particles in the grid are tracked by the discrete element method. The collision problem between particles is solved by DSMC and modified Nambu method based on hard sphere model. The distribution law of different particle size is studied and the influence of air velocity and ventilation mode on the distribution of dust particles is obtained. It is found that particle swirls will appear under some working conditions. Finally, the arch roadway model is established, and the influence of fully mechanized excavator on ventilation is considered. Based on the discrete phase model based on Euler-Lagrange method, the whole process of dust particle movement and the influence of air curtain on dust distribution are simulated. It is found that the dust in the rear of the roadheader is prone to deposition and the concentration will increase. The research results will be helpful to deeply understand the nature of dust movement behavior in fully mechanized excavation face, and provide more scientific and reasonable guidance for dust prevention and control principle and technology of fully mechanized working face and the formulation of effective dust prevention and dedusting measures.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD714

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