本文選題：高溫浮射流 + 浮力羽流��； 參考：《西安建筑科技大學》2015年碩士論文

【摘要】：諸多工業(yè)生產中都存在著傾倒工藝,該過程中加料罐向接收罐傾倒高溫物料,高溫物料在下落過程中會誘導和卷吸周圍空氣進入接收罐體,根據質量守恒定律,使接收罐內氣體從接收罐體口溢出,從而形成高溫且具有初始速度的浮射流。這部分浮射流不僅含有余熱和大量有害氣體還伴生粉塵顆粒。煙氣和粉塵會嚴重影響廠房空氣質量,同時給工人的健康帶來巨大的危害。因此,鐵水罐內鐵水傾倒至轉爐這一過程具有重要的研究價值。本文采用CFD方法對鐵水傾倒過程進行研究,并運用基于FLUENT商業(yè)軟件的兩相流模型,同時加入動網格技術,最終實現鐵水罐傾倒鐵水過程數值仿真。首先,建立二維模型,討論并驗證浮射流和浮力羽流特性。文中提出采用兩相流模型可對羽流進行數值模擬,即鐵水區(qū)域與周圍氣體區(qū)域,模擬結果與單相流基本一致。其次,由鐵水傾倒過程相界面的變化而將整個過程劃分成“倒前”、“傾倒”和“倒后”三個階段。階段一、二分界線為鐵水有無出鐵水罐進入轉爐。階段三則是鐵水全部進入轉爐之后。第一階段,流場較穩(wěn)定,速度不大,主要處于浮力羽流階段;第二階段,流場復雜,速度波動較大,主要由浮力羽流和浮射流共同作用;第三階段,由浮射流向浮力羽流過度,速度便逐漸平穩(wěn)。最后,由于浮升力和動量作用氣體均往鐵水罐和轉爐上方運動,并卷吸周圍氣體和粉塵,結合實際工程排風罩裝問題,故在鐵水罐和轉爐上方取一截斷面,研究整個傾倒過程斷面的平均速度變化。從斷面平均速度的變化趨勢,可更加直觀地指導工業(yè)通風。
[Abstract]:There is a dumping process in many industrial production, in which the high temperature material is dumped into the receiving tank by the feeding tank, and the high temperature material will induce and absorb the air around the receiving tank into the receiving tank during the falling process, according to the law of conservation of mass, A high temperature floating jet with initial velocity is formed by overflowing the gas from the receiving tank. This part of the floating jet not only contains residual heat and a large amount of harmful gases, but also associated with dust particles. Smoke and dust will seriously affect the air quality of factory buildings, and at the same time bring great harm to the health of workers. Therefore, the process of pouring molten iron into converter has important research value. In this paper, the CFD method is used to study the dumping process of molten iron, and the two-phase flow model based on FLUENT commercial software is used. At the same time, the dynamic grid technology is added to realize the numerical simulation of the pouring hot metal process in the molten iron tank. Firstly, a two-dimensional model is established to discuss and verify the characteristics of floating jet and buoyant plume. In this paper, a two-phase flow model is proposed to simulate the plume, that is, the hot metal region and the surrounding gas region. The simulation results are in good agreement with the single-phase flow. Secondly, the whole process can be divided into three stages by the change of the phase interface of molten iron dumping process: "before", "dumping" and "after pour". Stage one, two dividing line for molten iron with or without molten iron tank into the converter. Stage three is after all molten iron has entered the converter. In the first stage, the flow field is relatively stable and the velocity is small, which is mainly in the buoyancy plume stage; in the second stage, the flow field is complex and the velocity fluctuates greatly, mainly by the combination of buoyant plume and floating jet; in the third stage, the flow is over from floating jet to buoyant plume. The speed gradually leveled off. Finally, because the floating lift and momentum action gas move to the top of the molten iron tank and converter, and absorb the surrounding gas and dust, combined with the practical engineering exhaust air cover installation problem, so a section is taken above the molten iron tank and converter. The variation of average velocity of the whole toppling process is studied. From the change trend of average speed of section, it can direct industrial ventilation more intuitively.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X757;TF703

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本文編號：1961654