發(fā)布時間：2018-04-18 09:22

  本文選題：綜采工作面 + 霧滴粒徑��； 參考：《山東科技大學(xué)》2017年碩士論文

【摘要】：礦井粉塵是煤炭生產(chǎn)加工過程中的必然產(chǎn)物,為保障礦工健康及煤礦的安全、高效生產(chǎn),就必須解決礦井人員作業(yè)區(qū)域粉塵濃度過高的問題。噴霧降塵技術(shù)是控制煤礦采掘工作面粉塵污染問題最為有效的技術(shù)途徑之一,因此提高噴霧降塵效率,對煤礦安全生產(chǎn)具有重要的意義。本文主要采用了理論分析、實(shí)驗(yàn)室研究、數(shù)值模擬與現(xiàn)場應(yīng)用等多種手段相結(jié)合的方法,主要研究內(nèi)容及成果如下:研究噴嘴射流霧化及降塵機(jī)理,建立噴霧降塵數(shù)學(xué)模型,分析影響霧滴捕塵效果的主要因素�；�于PDI技術(shù)利用相位多普勒激光干涉儀,優(yōu)選宏觀霧化特性較好的噴嘴進(jìn)行噴霧霧化特性實(shí)驗(yàn),并對優(yōu)選噴嘴B2#的霧場霧滴粒徑、霧滴速度等多種霧化特性因素的三維空間分布變化規(guī)律進(jìn)行耦合分析,得出:噴霧壓力為8MPa時,距離噴嘴口 400mm-1000mm的霧場區(qū)間范圍內(nèi),霧滴SMD在60μm～90μm范圍內(nèi),霧滴粒徑主要分布在30μm～120μm之間,霧滴軸向速度值在20m/s～30m/s之間,并進(jìn)行噴霧場區(qū)間降塵實(shí)驗(yàn),確定了噴霧霧場的最佳降塵區(qū)間。利用FLUENT軟件,首先對定空間內(nèi)噴嘴噴霧的氣-霧兩相流場進(jìn)行了數(shù)值模擬,并在此基礎(chǔ)上研究噴嘴在綜采工作面現(xiàn)實(shí)工況下的降塵霧場形成效果,對采煤機(jī)外噴霧、液壓支架架間噴霧等霧化降塵技術(shù)進(jìn)行數(shù)值模擬,揭示綜采工作面降塵霧場特征及噴霧降塵機(jī)制。結(jié)合噴嘴霧場最佳降塵區(qū)間的結(jié)論,對工作面現(xiàn)有的降塵技術(shù)進(jìn)行優(yōu)化和改進(jìn),研發(fā)了可包裹采煤機(jī)滾筒區(qū)域的新型采煤機(jī)外噴霧降塵裝置,以及降塵霧場可覆蓋采煤區(qū)域全斷面并實(shí)現(xiàn)負(fù)壓吸塵凈化的液壓支架架間噴霧引射除塵裝置,并在石泉煤礦30106工作面進(jìn)行了現(xiàn)場應(yīng)用,工作面全塵與呼塵平均降塵率分別達(dá)到了 88.1%和85.0%,實(shí)現(xiàn)綜采工作面粉塵的有效沉降。
[Abstract]:Mine dust is an inevitable product in the process of coal production and processing. In order to ensure the health of miners and the safety and efficient production of coal mines, it is necessary to solve the problem of excessive concentration of dust in the working area of mine personnel.Spray dust control technology is one of the most effective ways to control dust pollution in coal mining face, so it is of great significance to improve the efficiency of dust control in coal mine.This paper mainly adopts the methods of theoretical analysis, laboratory research, numerical simulation and field application. The main research contents and results are as follows: the atomization and dust control mechanism of nozzle jet is studied, and the mathematical model of spray dust reduction is established.The main factors influencing the dust trapping effect of droplets are analyzed.Based on phase Doppler laser interferometer, the spray atomization characteristics of the nozzle with good macroscopic atomization characteristics were selected and the droplet diameter of the atomized field of the optimized nozzle B2# was studied.The coupling analysis of three dimensional spatial distribution of atomizing characteristic factors such as droplet velocity is carried out. When the spray pressure is 8MPa, the droplet SMD is in the range of 60 渭 m ~ 90 渭 m in the range of fog field from the nozzle mouth 400mm-1000mm.The droplet diameter is mainly distributed in the range of 30 渭 m ~ 120 渭 m, and the axial velocity of droplet is between 20m/s~30m/s.By using FLUENT software, the gas-fog two-phase flow field of nozzle spray in fixed space is numerically simulated, and on the basis of this, the formation effect of dust mist field of nozzle in actual working condition of fully mechanized coal mining face is studied, and the outside spray of coal mining machine is also studied.In order to reveal the characteristics of dust dust field and the mechanism of spray dust reduction in fully mechanized coal mining face, the atomization and dust control technology such as spray between supports are numerically simulated.Combined with the conclusion of the optimal dust control section of the nozzle fog field, the existing dust control technology in the working face is optimized and improved, and a new type of dust control device outside the shearer is developed, which can be wrapped in the drum area of the shearer.And the dust removal device between the hydraulic support frame which can cover the whole section of coal mining area and realize negative pressure dust cleaning is applied in the 30106 working face of Shi Quan Coal Mine.The average dust reduction rate of working face is 88.1% and 85.0%, respectively, which realizes the effective deposition of dust in fully mechanized coal mining face.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD714.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王鵬飛;劉榮華;桂哲;茍尚旭;舒威;譚p蓽，

本文編號：1767754