【摘要】：化工產(chǎn)品在其生產(chǎn)、使用、存儲、運輸?shù)雀鱾�階段都存在著各類危險隱患,在這個過程中,易燃易爆、有毒有害氣體的重大泄漏事故時有發(fā)生,并且總會伴隨不同程度的人員傷亡、財產(chǎn)損失及對生態(tài)環(huán)境造成破壞。重質(zhì)氣體由于密度較大,在擴散時會因為重力作用而在近地面出停留較長時間,如果泄漏的氣體為有毒有害氣體,那么此類事故對泄漏源周圍人群的傷害可想而知。也正是由于這個原因,重質(zhì)氣體的泄漏擴散問題一直被作為一個特殊問題來研究。為研究重質(zhì)氣體擴散規(guī)律,本文針對重質(zhì)氣體泄漏擴散問題進行了研究,以SF6為研究對象,根據(jù)相似理論和量綱和諧理論建立實驗?zāi)Ｐ?并在不同的風(fēng)速和泄漏高度條件下進行SF6的氣體擴散實驗,應(yīng)用因次分析法對所測得的實驗數(shù)據(jù)進行統(tǒng)計分析,并由此運用MATLAB數(shù)學(xué)軟件計算方程組,推導(dǎo)出實驗氣體的泄漏擴散方程,并對所得出的方程用其他組的數(shù)據(jù)進行驗證。運用流體力學(xué)CFD軟件Fluent,對氣體在受相應(yīng)實驗環(huán)境條件影響下的擴散進行數(shù)值模擬,首先FLUENT的前處理軟件Gambit建立幾何模型,并進行網(wǎng)格劃分,然后設(shè)置邊界條件、初始值,再把數(shù)值模擬所得結(jié)果對照實驗結(jié)果,以驗證實驗數(shù)據(jù)的準確性。根據(jù)實驗數(shù)據(jù)和數(shù)值模擬的結(jié)果,為實驗氣體劃定警戒區(qū),即泄漏事故發(fā)生時對人的健康有影響的空間范圍,從而對重質(zhì)氣體泄漏事故的應(yīng)急救援技術(shù)提供理論依據(jù)。
文內(nèi)圖片：
圖片說明：實驗?zāi)Ｐ?br/>[Abstract]:There are all kinds of dangerous hidden dangers in the production, use, storage, transportation and other stages of chemical products. In this process, the major leakage accidents of flammable and explosive, toxic and harmful gases occur from time to time, and will always be accompanied by different degrees of casualties, property losses and damage to the ecological environment. Because of the high density of heavy gas, the heavy gas will stay near the ground for a long time because of gravity action when diffusing. If the leaked gas is toxic and harmful gas, then the damage of this kind of accident to the people around the leakage source can be imagined. It is for this reason that the leakage and diffusion of heavy gases has been studied as a special problem. In order to study the law of heavy gas diffusion, the problem of heavy gas leakage and diffusion is studied in this paper. Taking SF6 as the research object, the experimental model is established according to the similarity theory and dimensional harmony theory, and the gas diffusion experiment of SF6 is carried out under different wind speed and leakage height. The measured experimental data are statistically analyzed by dimensional analysis, and the equations are calculated by MATLAB mathematical software. The leakage diffusion equation of experimental gas is derived, and the equation is verified by other groups of data. The fluid mechanics CFD software Fluent, is used to simulate the diffusion of gas under the influence of the corresponding experimental environment conditions. Firstly, the geometric model is established by the pretreatment software Gambit of FLUENT, and the grid is divided, then the boundary conditions and initial values are set up, and then the numerical simulation results are compared with the experimental results to verify the accuracy of the experimental data. According to the experimental data and the results of numerical simulation, the warning area of the experimental gas, that is, the spatial range which has an impact on human health at the time of the leakage accident, is designated, thus providing a theoretical basis for the emergency rescue technology of the heavy gas leakage accident.
【學(xué)位授予單位】：華北科技學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ086

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