【摘要】：我國的大氣污染日益嚴重,而包含大量二氧化硫和氮氧化物的火電廠煤煙是首要的污染來源。隨著環(huán)保法規(guī)的日益嚴格,國家強制燃煤電廠進行煙氣脫硫并安裝脫硝裝置。脫硫脫硝過程中,通常會使用噴嘴,而氣液兩相流噴嘴以其優(yōu)越的性能得到了廣泛的應(yīng)用。本文便以氣液兩相流噴嘴為研究對象,通過理論分析、數(shù)值模擬和實驗研究三種方法,對其射流霧化機理進行了研究,并應(yīng)用于實際工程。 理論分析方面,主要介紹了氣液兩相流噴嘴的霧化機理,建立了數(shù)學(xué)模型的控制方程、湍流模型和組分輸運模型。對控制方程進行離散并通過交錯網(wǎng)格和SIMPLE算法對離散方程進行求解。 數(shù)值模擬方面,簡單說明了CFD軟件及其應(yīng)用,詳細描述了氣液兩相流噴嘴幾何模型的建立和網(wǎng)格化分,確定初始條件和邊界條件,并對相關(guān)參數(shù)進行設(shè)置。對兩相流噴嘴的內(nèi)外部流場進行了數(shù)值模擬,得出了噴嘴結(jié)構(gòu)參數(shù)和工作參數(shù)對液滴粒徑尺寸分布的影響。 實驗研究方面,介紹了氣液兩相流噴嘴的實驗臺、實驗用兩相流噴嘴和實驗測量坐標(biāo)系。通過對多次實驗結(jié)果進行分析和總結(jié),得出了噴嘴內(nèi)部的供液管、控氣塊和導(dǎo)氣塊對霧化效果的影響。 以上述所做的研究工作為指導(dǎo),將氣液兩相流噴嘴應(yīng)用到實際工程中,與其它工業(yè)設(shè)備和控制系統(tǒng)相結(jié)合,既滿足了工藝要求,又大大節(jié)約了水的消耗量。從而為企業(yè)節(jié)省了成本,具有較強的現(xiàn)實意義。 最后,對氣液兩相流噴嘴射流霧化機理的研究進行了總結(jié),所得結(jié)論為以后氣液兩相流噴嘴的研究提供了參考,并對如何改進研究的不足之處進行了展望,希望今后的研究能對其進行補充和完善。
[Abstract]:Air pollution is becoming more and more serious in China, and soot is the primary source of pollution in thermal power plants, which contain a large amount of sulfur dioxide and nitrogen oxides. With the increasingly strict environmental protection regulations, the national forced coal-fired power plant flue gas desulphurization and installation of denitrification device. In the process of desulfurization and denitrification, nozzles are usually used, while gas-liquid two-phase flow nozzles are widely used for their superior performance. In this paper, the atomization mechanism of gas-liquid two-phase flow nozzles is studied by means of theoretical analysis, numerical simulation and experimental study, and applied to practical engineering. In terms of theoretical analysis, the atomization mechanism of gas-liquid two-phase flow nozzles is introduced, and the governing equations, turbulence models and component transport models of the mathematical model are established. The governing equations are discretized and solved by staggered grid and SIMPLE algorithm. In the aspect of numerical simulation, the CFD software and its application are briefly explained, the geometric model of gas-liquid two-phase flow nozzle is described in detail, the initial conditions and boundary conditions are determined, and the relevant parameters are set up. The internal and external flow field of the two-phase flow nozzle is numerically simulated, and the influence of nozzle structure parameters and working parameters on the size distribution of droplet is obtained. In the aspect of experimental research, the experimental bench of gas-liquid two-phase flow nozzle is introduced, the two-phase flow nozzle and the experimental measuring coordinate system are used in the experiment. Based on the analysis and summary of many experimental results, the influence of liquid supply pipe, gas control block and gas guide block inside the nozzle on the atomization effect is obtained. Under the guidance of the above research work, the gas-liquid two-phase flow nozzle is applied to practical engineering, which is combined with other industrial equipment and control system, which not only meets the process requirements, but also saves the water consumption greatly. Thus saving the cost for the enterprise, has a strong practical significance. Finally, the research on atomization mechanism of gas-liquid two-phase jet nozzle is summarized, which provides a reference for the later research of gas-liquid two-phase flow nozzle, and prospects how to improve the research deficiency. It is hoped that the future research can complement and perfect it.
【學(xué)位授予單位】：山東建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：X773

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本文編號：2356845