本文關(guān)鍵詞： 風(fēng)力揚(yáng)塵 風(fēng)力輸運(yùn) 車輛運(yùn)行 皮帶振動(dòng) 霧滴存活時(shí)間　出處：《遼寧工程技術(shù)大學(xué)》2015年博士論文　論文類型：學(xué)位論文

【摘要】：礦井粉塵污染對(duì)井下作業(yè)工人的危害很大,是導(dǎo)致煤礦開采行業(yè)職業(yè)病的主要原因。運(yùn)輸巷道主要是輸煤皮帶巷和運(yùn)料及行人的輔運(yùn)巷,運(yùn)輸巷粉塵的產(chǎn)生和輸運(yùn)不同于采掘工作面,有必要對(duì)其進(jìn)行有針對(duì)性的研究。在現(xiàn)場(chǎng)實(shí)測(cè)和實(shí)驗(yàn)研究的基礎(chǔ)上,利用COMSOL Multiphysics 5.0開展三維數(shù)值模擬,對(duì)風(fēng)流因素、車輛行駛及皮帶運(yùn)行等過(guò)程對(duì)粉塵的影響進(jìn)行研究；采用Matlab14.0根據(jù)霧滴蒸發(fā)過(guò)程中的傳熱傳質(zhì)控制方程自編程序?qū)ζ湔舭l(fā)過(guò)程進(jìn)行仿真試驗(yàn),探索推導(dǎo)霧滴存活時(shí)間的綜合函數(shù),為提高噴霧降塵效率提供支撐；結(jié)合理論分析、現(xiàn)場(chǎng)實(shí)測(cè)、數(shù)值模擬和仿真試驗(yàn)對(duì)霧化降塵系統(tǒng)工藝進(jìn)行優(yōu)化并在現(xiàn)場(chǎng)考察其應(yīng)用效果。(1)開展了巷道風(fēng)流溫、濕度和壓力等對(duì)風(fēng)流密度、動(dòng)力粘度等影響的理論計(jì)算和粉塵自身含水率對(duì)其密度及粒徑影響的研究。溫度降低、濕度和壓力增大導(dǎo)致風(fēng)流的動(dòng)力粘度降低；含水率增加會(huì)增加顆粒的密度和粒徑；風(fēng)流動(dòng)力粘度降低,粉塵的運(yùn)移范圍更大,污染范圍更廣。(2)采用數(shù)值模擬的方法對(duì)巷道中風(fēng)流速度、車輛和皮帶運(yùn)行參數(shù)以及粉塵自身粒徑變化對(duì)巷道中風(fēng)力揚(yáng)塵和粉塵風(fēng)力輸運(yùn)的影響進(jìn)行研究。風(fēng)速增大,巷道的揚(yáng)塵強(qiáng)度增大,粉塵在一定范圍內(nèi)濃度降低,但污染范圍更廣,遠(yuǎn)距離處風(fēng)速增加粉塵濃度增加；車輛順風(fēng)行駛時(shí),距車頭尾25-30 m處出現(xiàn)粉塵濃度的“雙峰”分布,逆風(fēng)時(shí)行駛時(shí),距車尾25-35 m處出現(xiàn)粉塵濃度“單峰”分布且逆風(fēng)峰值遠(yuǎn)大于順風(fēng)峰值；車速越大揚(yáng)塵強(qiáng)度和粉塵濃度都越大；皮帶振幅和運(yùn)行速度越大、振動(dòng)頻率越高揚(yáng)塵強(qiáng)度和粉塵濃度越大。(3)進(jìn)行了噴嘴霧化效果實(shí)驗(yàn)研究和降塵效率計(jì)算。實(shí)驗(yàn)表明型號(hào)為PZF(ψ1.2 mm)的噴嘴在氣壓為0.11-0.65 MPa,水壓為0.45-2.55 MPa, ALR為0.02-0.11,水流量為500-700kg/h時(shí)其霧滴速度70-220 m/s,粒徑為20-80μm,其理論降塵效率達(dá)90%。(4)采用Matlab14.0,基于霧滴蒸發(fā)過(guò)程的傳熱傳質(zhì)控制方程對(duì)其蒸發(fā)過(guò)程進(jìn)行了仿真試驗(yàn)研究。霧滴蒸發(fā)過(guò)程主要受6個(gè)因素的影響,霧滴初始半徑、環(huán)境濕度、風(fēng)流壓力增加霧滴的存活時(shí)間延長(zhǎng)；霧滴與風(fēng)流的相對(duì)速度、環(huán)境初始溫度以及霧滴的初始溫度增加其存活時(shí)間降低,但霧滴初始溫度對(duì)其影響較小。通過(guò)均勻試驗(yàn)并結(jié)合因子分析進(jìn)行降維處理,推導(dǎo)出含有5個(gè)關(guān)鍵參數(shù)的霧滴存活時(shí)間計(jì)算公式,對(duì)比顯示其具有較高的精度。(5)開展了霧化降塵系統(tǒng)現(xiàn)場(chǎng)應(yīng)用效果考察。根據(jù)數(shù)值模擬與仿真試驗(yàn)研究結(jié)果設(shè)計(jì)了運(yùn)輸巷粉塵自動(dòng)監(jiān)測(cè)和自動(dòng)霧化降塵系統(tǒng)方案,搭建了自動(dòng)霧化降塵系統(tǒng),進(jìn)行了現(xiàn)場(chǎng)應(yīng)用和降塵效率考察,結(jié)果顯示自動(dòng)霧化降塵系統(tǒng)的降塵效率可以達(dá)到86%以上。
[Abstract]:Mine dust pollution is a major cause of occupational disease in coal mining industry, and it is the main cause of occupational disease in coal mining industry. The main transportation roadway is coal conveyance belt roadway and auxiliary roadway for transporting materials and pedestrians. The generation and transport of dust in transport roadway is different from that in mining face, so it is necessary to study it pertinently. On the basis of field measurement and experimental study, using COMSOL Multiphysics 5.0 to carry out three-dimensional numerical simulation, the factors of air flow are analyzed. The influence of vehicle driving and belt running on dust was studied, and the simulation test was carried out by Matlab14.0 according to the heat and mass transfer control equation of droplet evaporation, and the comprehensive function of droplet survival time was deduced. In order to provide support for improving the efficiency of spray dust control, combined with theoretical analysis, field measurement, numerical simulation and simulation test, the process of atomization dust control system was optimized and its application effect was investigated in the field. The theoretical calculation of the influence of humidity and pressure on air flow density and dynamic viscosity, and the study of the influence of dust moisture content on its density and particle size. The decrease of temperature, the increase of humidity and pressure leads to the decrease of dynamic viscosity of air flow. The increase of water content will increase the density and particle size of particles, decrease the dynamic viscosity of air flow, increase the range of dust migration, and increase the range of pollution. (2) numerical simulation method is used to simulate the velocity of air flow in roadway. The effects of vehicle and belt operation parameters and dust particle size on wind dust and dust transport in roadway are studied. The wind speed increases, the dust intensity increases, and the dust concentration decreases within a certain range. However, the range of pollution is wider, the wind speed increases at a long distance and the dust concentration increases. When the vehicle is driving in the wind, the "double peak" distribution of dust concentration appears at 25-30 m from the front and the tail of the vehicle, and when driving against the wind, There is a "single peak" distribution of dust concentration at 25-35 m from the rear of the vehicle, and the peak value of the headwind is much larger than that of the downwind peak; the greater the speed of driving, the greater the dust intensity and dust concentration, the greater the belt amplitude and the running speed. The higher the vibration frequency, the greater the dust intensity and dust concentration.) the atomization effect of the nozzle and the dust reduction efficiency are studied. The experimental results show that the nozzle with PZF (蠄 1.2mm) has a pressure of 0.11-0.65 MPA, a water pressure of 0.45-2.55 MPA, a ALR of 0.02-0.11, and a water flow rate of 500-700kg / h. The droplet velocity is 70-220 m / s, the particle size is 20-80 渭 m, and the theoretical dust reduction efficiency is 90 渭 m. Matlab14.0 is used to simulate the evaporation process based on the heat and mass transfer control equation of droplet evaporation. The droplet evaporation process is mainly affected by six factors. The relative velocity of droplet to air flow, the initial temperature of the environment and the initial temperature of the droplet were increased, and the survival time of droplet was decreased with the increase of the initial radius of the droplet, the humidity of the environment, the pressure of the air flow, the relative velocity of the droplet and the wind flow. However, the initial temperature of droplet has little effect on it. Through uniform test and factor analysis, the formula for calculating the droplet survival time with five key parameters is derived. The comparison shows that it has high precision. (5) the field application effect of atomization dust control system is investigated. According to the results of numerical simulation and simulation test, the scheme of automatic dust monitoring and automatic atomization dust control system in transportation roadway is designed. The automatic atomization dust control system was built, and the field application and dust removal efficiency were investigated. The results show that the dust control efficiency of the automatic atomization dust control system can reach more than 86%.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD714.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 徐景德,周心權(quán);有源巷道中粉塵運(yùn)移與濃度分布規(guī)律的實(shí)驗(yàn)研究[J];湘潭礦業(yè)學(xué)院學(xué)報(bào);1999年02期

相關(guān)博士學(xué)位論文 前2條

1 張大明;輸煤巷道煤塵運(yùn)移規(guī)律及治理技術(shù)研究[D];遼寧工程技術(shù)大學(xué);2010年

2 劉晨;復(fù)雜燃燒流場(chǎng)數(shù)值模擬方法研究[D];南京航空航天大學(xué);2009年

相關(guān)碩士學(xué)位論文 前2條

1 陳宇輝;湍流噴霧液滴蒸發(fā)與輸運(yùn)的LES-FDF數(shù)值模擬研究[D];浙江大學(xué);2012年

2 黃優(yōu);選煤廠篩分車間除塵機(jī)理研究[D];貴州大學(xué);2009年

，

本文編號(hào)：1518621