發(fā)布時間：2019-05-07 00:53

【摘要】：在化工、石油、冶金、電力等工業(yè)生產(chǎn)中，經(jīng)常存在高溫污染源，高溫污染源會不斷向環(huán)境中散發(fā)污染物，影響工作區(qū)環(huán)境質(zhì)量。目前多采用局部排風系統(tǒng)對此部分污染物進行控制。但是由于在工業(yè)生產(chǎn)中，為滿足工藝設計的要求、場地的限制、以及人工操作等諸多因素的影響，局部排風系統(tǒng)往往不能合理設置。污染物的控制效果并不理想，仍然有大量污染物逃逸到工作區(qū)，對工人工作環(huán)境造成影響。本文以此為背景，對局部排風系統(tǒng)作用下，污染物仍然大量逃逸問題進行研究，在對氣流流場特性以及粒子分布的分析基礎上，提出相應控制策略。 首先，本文在確定了合理的湍流模型以及邊界條件的基礎上，，分析了造成逃逸現(xiàn)象的不同影響因素，分別為熱射流初速度，熱射流初始溫度，熱射流初速度方向與排風罩控制速度方向夾角，對這些因素設置不同的工況進行模擬計算，通過計算所得到的流場特性，分析局部排風罩處逃逸原因以及逃逸出的氣流的流量特性。 其次，在流場計算結果的基礎上，利用DPM顆粒軌道離散模型，加載粒子相，數(shù)值模擬計算兩相流，得到粒子運動軌跡，通過房間溫度分布、粒子逃逸率以及逃逸粒子在空間分布情況來分析不同影響因素下，對房間環(huán)境造成的影響。 最后，針對本文分析得出的影響逃逸的因素，提出相應的控制策略，如增大原排風罩風量、為原排風罩加設擋板以及增設二次排風罩，并且對幾種控制策略的控制效果進行分析，為實際工業(yè)生產(chǎn)改進措施提供理論依據(jù)。
[Abstract]:In chemical, petroleum, metallurgy, electric power and other industrial production, there are often high-temperature pollution sources, high-temperature pollution sources will continuously release pollutants to the environment, affecting the environmental quality of the work area. At present, local exhaust air system is often used to control this part of pollutants. However, in order to meet the requirements of process design, the limitation of site, and the influence of many factors such as manual operation, the local air exhaust system can not be set up reasonably in industrial production. The control effect of pollutants is not ideal, there are still a large number of pollutants escape to the work area, which has an impact on the working environment of workers. In this paper, a large number of pollutants still escape under the action of local exhaust system are studied. Based on the analysis of the characteristics of air flow field and the distribution of particles, the corresponding control strategies are put forward. Firstly, on the basis of the reasonable turbulence model and boundary conditions, the different influencing factors of escape phenomenon are analyzed, which are the initial velocity of hot jet and the initial temperature of hot jet, respectively. The angle between the initial velocity direction of the heat jet and the control velocity direction of the exhaust hood is included. These factors are simulated under different working conditions, and the characteristics of the flow field obtained by the calculation are calculated. The reasons of escape and the flow characteristics of the escaped air flow are analyzed. Secondly, on the basis of the results of the flow field calculation, the particle trajectory is obtained by using the discrete model of the DPM particle orbit, loading the particle phase, and numerically simulating the two-phase flow, and the temperature distribution in the room is obtained. The effects of different factors on the room environment are analyzed by means of the particle escape rate and the spatial distribution of the escape particles. Finally, in view of the factors that affect the escape, the corresponding control strategies are put forward, such as increasing the air volume of the original exhaust hood, setting up the baffle for the original exhaust hood and adding the secondary exhaust cover. The control effects of several control strategies are analyzed in order to provide the theoretical basis for the practical industrial production improvement measures.
【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】：2013
【分類號】：X962;X701.2

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