本文選題：掘進(jìn)面粉塵 + 通風(fēng)系統(tǒng)�。� 參考：《太原理工大學(xué)》2017年碩士論文

【摘要】：在煤礦巷道掘進(jìn)過程中產(chǎn)生的粉塵量遠(yuǎn)大于《煤礦防爆安全規(guī)程》中的規(guī)定,高濃度的粉塵不僅嚴(yán)重威脅煤礦工人的身體健康,而且是煤礦安全生產(chǎn)的一大隱患,因此掘進(jìn)面粉塵治理一直是煤礦安全的研究重點(diǎn)。而掘進(jìn)面粉塵的高效解決取決于兩個(gè)方面,一是控塵技術(shù),設(shè)計(jì)高效的通風(fēng)系統(tǒng),保證掘進(jìn)面的粉塵盡可能都被除塵設(shè)備帶走;二是除塵技術(shù),對進(jìn)入除塵器內(nèi)部的粉塵進(jìn)行高效處理。而目前通風(fēng)系統(tǒng)不完善、不可靠仍然是煤礦重大事故隱患之一,且目前我國大部分煤礦采用除塵率為50%~70%的濕式除塵器,對極易引發(fā)塵肺病的呼吸性粉塵的處理能力不足。因此,研究掘進(jìn)面通風(fēng)系統(tǒng)及新型礦用干式除塵器對掘進(jìn)面粉塵治理有很重要的意義。針對上述問題,本論文研究了某實(shí)際掘進(jìn)巷道通風(fēng)系統(tǒng)的風(fēng)筒參數(shù)對除塵效率的影響,為提高其通風(fēng)系統(tǒng)的除塵效率提供指導(dǎo);并且對除塵效率高達(dá)99.99%的新型礦用HBKO1/600干式除塵器的內(nèi)部流場特性進(jìn)行研究,為進(jìn)一步研發(fā)適用于我國煤礦生產(chǎn)的干式除塵器奠定基礎(chǔ)。具體研究內(nèi)容包括以下幾個(gè)方面:首先分析氣固兩相流基本理論,建立氣固兩相流控制方程;并分析了纖維過濾機(jī)理,為計(jì)算機(jī)數(shù)值模擬提供理論指導(dǎo)。在此基礎(chǔ)上,在地面模擬巷道內(nèi),對壓入式、抽出式和長壓短抽式通風(fēng)系統(tǒng)進(jìn)行試驗(yàn)研究,并分別建立其三維模型,在ICEM中進(jìn)行網(wǎng)格劃分,然后應(yīng)用Fluent軟件對各通風(fēng)系統(tǒng)模型進(jìn)行數(shù)值模擬。研究表明:仿真結(jié)果與試驗(yàn)結(jié)果基本一致,驗(yàn)證了仿真模型、網(wǎng)格劃分、仿真方法及邊界條件設(shè)置的正確性。然后針對某實(shí)際掘進(jìn)巷道,建立不同風(fēng)筒參數(shù)的長壓短抽通風(fēng)系統(tǒng)巷道模型,采用相同的模擬方法,對各模型的粉塵處理情況進(jìn)行仿真分析。研究結(jié)果表明:針對該實(shí)際掘進(jìn)巷道,當(dāng)除塵系統(tǒng)的正壓風(fēng)筒出口、負(fù)壓風(fēng)筒吸口距掘進(jìn)面分別為8 m和2 m,正、負(fù)壓風(fēng)筒距巷道地面的高度分別為2.2 m和1 m,正壓風(fēng)筒直徑約為0.6 m時(shí),除塵效率較高。最后,對新型礦用HBKO1/600干式除塵器進(jìn)行研究,在UG軟件中建立1:1三維模型,在ICEM中生成網(wǎng)格,利用Fluent軟件對其內(nèi)部運(yùn)行軌跡、壓力場、速度場進(jìn)行數(shù)值模擬。研究結(jié)果表明:所研究干式除塵器采用上下箱體分離的結(jié)構(gòu),避免了進(jìn)口處的高速氣流對濾芯表面的沖擊,布置在下箱體的濾芯表面速度和壓強(qiáng)分布比傳統(tǒng)袋式除塵器均勻;但各濾芯間的處理風(fēng)量存在不均勻現(xiàn)象,且該現(xiàn)象與濾芯位置有關(guān)。并對不同過濾速度和濾芯滲透率下除塵器內(nèi)部流場特性進(jìn)行研究,研究表明:隨著過濾速度的增大,除塵器內(nèi)部整體氣流分布不均勻程度也隨之增大;而濾芯滲透率對各個(gè)濾芯處理風(fēng)量和速度場分布幾乎沒有影響,但是減小濾芯滲透率,會帶來除塵器內(nèi)部較大的壓降,尤其對濾芯間隙的壓降影響較大。
[Abstract]:The amount of dust produced in the tunneling process of coal mine roadway is much larger than that stipulated in the regulations on Safety of explosion Prevention in Coal Mine. The high concentration of dust not only seriously threatens the health of coal miners, but also is a major hidden danger in the safe production of coal mines. Therefore, dust treatment of heading face has been the focus of coal mine safety research. The efficient solution of tunneling flour dust depends on two aspects: one is dust control technology, the design of efficient ventilation system to ensure that the dust of the heading surface is taken away by dust removal equipment as far as possible; the other is dust removal technology. The dust that enters the dust collector interior carries on the high efficiency treatment. At present, the ventilation system is not perfect and unreliable is still one of the hidden dangers of coal mine major accidents. At present, most coal mines in China adopt wet dust precipitators with a dust removal rate of 50% or 70%, and the ability to deal with respiratory dust which is easy to cause pneumoconiosis is insufficient. Therefore, it is very important to study the ventilation system and new type dry dust collector for the dust treatment. In view of the above problems, this paper studies the influence of tuyere parameters on the dust removal efficiency of a practical tunneling roadway ventilation system, and provides guidance for improving the dust removal efficiency of the ventilation system. The internal flow field characteristics of a new type of HBKO1/600 dry dust collector with a dust removal efficiency of 99.99% are studied, which lays a foundation for further research and development of a dry dust collector suitable for coal mine production in China. The specific research contents include the following aspects: firstly, the basic theory of gas-solid two-phase flow is analyzed, and the governing equation of gas-solid two-phase flow is established, and the mechanism of fiber filtration is analyzed, which provides theoretical guidance for computer numerical simulation. On this basis, in the ground simulation roadway, carry on the experimental research to the pressure-in type, the extraction type and the long pressure-short pumping type ventilation system, and separately establish its three-dimensional model, carry on the mesh division in the ICEM, Then the model of ventilation system is simulated by Fluent software. The results show that the simulation results are in good agreement with the experimental results, and the correctness of the simulation model, mesh generation, simulation method and boundary condition setting are verified. Then the roadway model of long pressure and short suction ventilation system with different tuyere parameters is established for a practical tunneling roadway. The dust treatment of each model is simulated and analyzed by the same simulation method. The results show that: for the actual tunneling roadway, when the barotropic duct outlet of the dust removal system is 8 m and 2 m from the driving surface, the suction opening of the negative pressure duct is 8 m and 2 m, respectively. The dust removal efficiency is higher when the height of negative pressure tubing from roadway ground is 2.2 m and 1 m, and the diameter of barotropic tubing is about 0.6 m. Finally, a new type of HBKO1/600 dry precipitator for mining is studied. The 1:1 3D model is built in UG software, and the mesh is generated in ICEM. The internal running track, pressure field and velocity field are simulated by Fluent software. The results show that the dry dust collector adopts the structure of separating upper and lower boxes, which avoids the impact of high speed airflow on the surface of filter core, and the distribution of velocity and pressure on the surface of filter core is more uniform than that of traditional bag filter. However, there is an uneven air flow rate among the filter elements, and this phenomenon is related to the location of the filter element. The characteristics of the internal flow field of the dust collector under different filtration speed and filter core permeability are studied. The results show that with the increase of the filtration speed, the unevenness of the whole air distribution in the dust collector also increases. The permeability of filter core has little effect on the distribution of air volume and velocity field, but reducing the permeability of filter core will lead to a large pressure drop in the dust collector, especially on the pressure drop of filter core clearance.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD724;TD714.4

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