本文選題：多污染源　切入點：濃度分布　出處：《西安建筑科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國工業(yè)水平的快速提高,在工業(yè)生產(chǎn)過程中伴隨著大量的污染物正日益危害著我們的生活,環(huán)境污染是當(dāng)今21世紀(jì)亟需解決的問題。工業(yè)生產(chǎn)的過程中生成的污染物不但危害著人們的健康,同時也嚴(yán)重影響了企業(yè)的產(chǎn)品質(zhì)量。因此,研究污染氣體的分布規(guī)律將為改善工業(yè)室內(nèi)空氣品質(zhì)奠定一定的基礎(chǔ)。國內(nèi)外對室內(nèi)環(huán)境影響的研究多集中于不同送風(fēng)氣流對室內(nèi)污染物濃度分布的影響,而很少對污染源在室內(nèi)的散發(fā)特性進(jìn)行研究,同時大多數(shù)對于污染源散發(fā)的研究多針對于民用建筑室內(nèi)的均勻排放,而對于現(xiàn)有的局部污染源對室內(nèi)污染物分布的影響研究多局限于單一污染源,而沒有研究多污染源共同作用下對室內(nèi)污染物濃度分布的情況。因此,本文針對室內(nèi)存在多污染源情況下,研究了多污染源共同作用下對室內(nèi)污染物濃度分布的影響。本課題通過實驗觀察雙污染源在室內(nèi)的散發(fā)情況,來研究雙污染源散發(fā)特性,分析并總結(jié)出污染物在室內(nèi)的分布特性和隨時間的變化規(guī)律,得出污染源正上方兩點的濃度明顯高于污染源周圍其他各點,由此可以看出污染源正上方水平方向上呈雙峰現(xiàn)象;同時分析得出六個測點濃度均隨時間的增加而增大,并且雙污染源同時散發(fā)出現(xiàn)的雙峰現(xiàn)象隨時間推進(jìn)一直存在且更為顯著,這為后續(xù)的模擬提供有力的科學(xué)依據(jù)。進(jìn)而由此采用計算流體力學(xué)方法,對單污染源單獨散發(fā)和雙污染源共同作用的情況進(jìn)行了數(shù)值模擬,分析和比較了單污染源單獨散發(fā)時污染物濃度場的數(shù)值疊加值和雙污染源共同作用下的污染物濃度場間的差異,定義并運用了疊加差的概念,分析和比較了室內(nèi)污染氣體的濃度分布,得出濃度最大值在1.7m并得出單污染源單獨散發(fā)濃度場的數(shù)值疊加值整體要高于雙污染源共同作用值,但是在源項上方時雙污染源共同作用值要高于單污染源的數(shù)值疊加值,所以研究多污染源散發(fā)時不能將單污染源進(jìn)行簡單的疊加;并通過改變源項污染物濃度,總結(jié)源項濃度對疊加差值的影響。最后通過改變污染源數(shù)量,污染源源項濃度,污染源相對距離和污染源高度,分析并比較了這些因素對室內(nèi)污染物濃度分布的影響�？偨Y(jié)得出當(dāng)總散發(fā)強(qiáng)度相同的情況下,將單一污染源拆分成多個污染源時,室內(nèi)污染物濃度將會增大,而此時仍按照原來風(fēng)量計算,勢必會造成結(jié)果的偏差,不能滿足室內(nèi)環(huán)境的要求;研究得出隨著源項濃度增大,室內(nèi)污染物濃度也隨之增大,并得出源項濃度是本文所研究的四種因素中影響室內(nèi)污染物分布最主要的因素,因此在控制并解決室內(nèi)污染問題上,應(yīng)首要考慮減少污染源源項的排放強(qiáng)度;污染源分布越分散,室內(nèi)污染物濃度越大,并且出現(xiàn)濃度最大值的位置將會降低,這就會造成人們更加容易暴露在高污染濃度的環(huán)境中;污染源排放的高度越高,地面附近污染源濃度分布越低,因此在設(shè)計和規(guī)劃污染源高度時,可以在工藝允許的范圍內(nèi),合理地增加污染源的高度以降低近地面的污染物濃度分布,并在一定范圍內(nèi)減少局部地區(qū)的污染物濃度。
[Abstract]:With the rapid increase of China's industrial level, in the process of industrial production with a large amount of pollutants is more harmful to our life, environmental pollution is the twenty-first Century urgent problem. In the process of industrial production generated pollutants not only harm people's health, but also seriously affect the quality of enterprise products. Therefore, distribution of gas pollutants will lay a solid foundation for the improvement of indoor air quality industry. Research on the influence to the indoor environment at home and abroad focus on different air flow effects on indoor pollutant concentration distribution, and few studies of pollution sources in the interior of the emission characteristics, at the same time for the most uniform emission source emitting research multi needle for civil buildings, and for the existing local pollution sources of indoor pollutant distribution is limited to single pollution The source, without the interaction of multiple pollution sources on indoor pollutant distribution. Therefore, according to the existing indoor pollution sources situation, studies the interaction of multiple pollution sources on indoor pollutant distribution. The influence of this topic through the experimental observation of two pollution sources distributed in the indoor environment, to study two sources of pollution emission characteristics, analyzed and summed up the changes of pollutants in the indoor distribution characteristics and time, makes two concentration just above the source of pollution is obviously higher than that of other points around the pollution source, it can be seen that the pollution source is at the top of the horizontal direction is also the phenomenon of Shuangfeng; analysis of six measurement points with concentration time increases, and the double pollution source while distributing Shuangfeng phenomenon appeared with the advance of time and there has been more significant, which is the follow-up simulation provides a strong scientific basis. Then using the CFD method, the interaction of the single source of pollution emission and pollution source of two separate cases were simulated, analyzed and compared with single pollution source alone interaction numerical superposition of pollutant concentration field values and two pollution sources under the pollutant concentration difference, and uses the concept definition the superposition of difference, analysis and comparison of the indoor air pollution concentration distribution, the maximum concentration in the 1.7m and the single pollution source emission concentration field superposition separate numerical value integral to interaction is higher than that of double sources of value, but is in the source above the common double pollution source value is higher than that of single pollution source superposition the value, so many pollution source emission can not be a single pollution source for simple superposition; and by changing the source of pollutant concentration, summarizes the source concentration on the difference. After the superposition Changing the number of pollution sources, pollution source pollution source concentration, relative distance and pollution sources, analyze and compare the effects of these factors on the concentration distribution of indoor pollutants. Concluded that when the total with the same intensity, the single pollution source is split into multiple pollution sources, indoor pollutant concentration will increase, and this is still in accordance with the original calculation, it will cause the deviation, can not meet the requirements of indoor environment; with the source of the increase of the concentration of indoor pollutant concentration increases, and the source of indoor pollutant concentration is the main factor affecting the distribution of the four factors in this research, so in control and solve the problem of indoor air pollution, we should first consider reducing pollution emissions intensity source; pollution source distribution is more dispersed, the greater the indoor pollutant concentration, and concentration of the maximum value of the bit Set will be reduced, this will cause people more likely to be exposed to high concentration of pollution in the environment; pollution source emission height near the ground pollution concentration distribution is low, so in the design and planning of pollution source height, can be within the allowable range of process, a reasonable increase in pollution so as to reduce the height of pollutants the concentration distribution near the ground, and to reduce the pollutant concentration of the local area in a certain range.

【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X51

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本文編號：1567222