【摘要】：本文在前人有關(guān)浮法玻璃熔窯數(shù)學(xué)模擬研究的基礎(chǔ)上,開發(fā)了描述流體中氣泡行為特征的數(shù)學(xué)模型,通過模型耦合得到了專門描述浮法玻璃熔體中氣泡行為特征的數(shù)學(xué)模型。應(yīng)用此模型,對我國首座日熔化量600噸的全氧燃燒型浮法玻璃熔窯進(jìn)行了仿真模擬。重點(diǎn)研究了該熔窯玻璃液流場以及玻璃熔體中氣體分布特點(diǎn),分析了該熔窯氣泡澄清困難的原因,提出了針對該熔窯的優(yōu)化調(diào)整措施和具體工藝優(yōu)化參數(shù),并運(yùn)用研究結(jié)果指導(dǎo)了該熔窯的實(shí)際工業(yè)調(diào)試,取得了良好的驗(yàn)證效果。 通過對該熔窯玻璃液流場以及玻璃熔體中氣體分布的仿真模擬研究表明：(1)對具有卡脖冷卻水包和鼓泡器的浮法玻璃熔窯而言,其玻璃液存在四個主要環(huán)流；(2)與普通浮法玻璃熔窯相比,全氧燃燒型浮法玻璃熔窯由于其溫度制度較高,玻璃液環(huán)流運(yùn)動速度較快,玻璃液池底熱點(diǎn)溫度也較高,因此很容易導(dǎo)致芒硝(澄清劑)在澄清均化前區(qū)分解過快,使熱點(diǎn)之后玻璃液表面短時間內(nèi)產(chǎn)生較多氣泡難以消除并堆積形成“泡沫層”；(3)在熔窯澄清均化前區(qū),玻璃液中CO2、SO3這兩種氣體濃度較高,將直接影響到玻璃熔體中小氣泡內(nèi)部氣體的擴(kuò)散,導(dǎo)致小氣泡難以消除產(chǎn)生氣泡缺陷。 通過對該熔窯氣泡澄清困難原因的分析,提出針對該熔窯的優(yōu)化調(diào)整措施和具體工藝參數(shù)如下：(1)鼓泡器最優(yōu)調(diào)整措施及參數(shù)：鼓泡器1排,距離投料池前壁13.14m,鼓泡器數(shù)目20個,鼓泡器間距0.452m,單個鼓泡器泡數(shù)為20個/分鐘,且保證鼓泡器單位氣體總流量為1.50Nm3/h；(2)卡脖冷卻水包最優(yōu)調(diào)整措施及參數(shù)：卡脖冷卻水包數(shù)目1根,距離投料池前壁33.936m,插入液面深度0.45m；(3)熔窯玻璃液熱點(diǎn)最優(yōu)參數(shù)：熱點(diǎn)位置距玻璃液面1.15m,距投料池前壁18.38m,熱點(diǎn)溫度為1408.13℃；(4)溫度制度最優(yōu)分配方式：采用“雙熱點(diǎn)”熔窯溫度分配制度,更有利于熔化和澄清。 通過運(yùn)用數(shù)學(xué)模擬有針對性的研究全氧燃燒型浮法玻璃熔窯氣泡問題,并通過數(shù)學(xué)模擬提出優(yōu)化措施,指導(dǎo)了實(shí)際生產(chǎn)的調(diào)試過程,使得該熔窯氣泡問題得到極大改善,從而顯示出該數(shù)學(xué)模型的實(shí)用性,同時也為全氧燃燒型浮法玻璃熔窯在我國的技術(shù)推廣起到了指導(dǎo)作用。
[Abstract]:On the basis of previous studies on the mathematical simulation of float glass furnace, a mathematical model describing the behavior characteristics of bubbles in fluid has been developed in this paper. By coupling the model, a mathematical model describing the behavior characteristics of bubbles in float glass melt has been developed. With this model, the first full-oxygen combustion float glass with a daily melting capacity of 600 tons has been built in China. The simulation of the glass furnace is carried out. The flow field of the glass melt and the gas distribution in the glass melt are mainly studied. The reasons for the difficulty in clarifying the bubble in the furnace are analyzed. The optimum adjustment measures and specific process parameters are put forward. The results are used to guide the actual industrial commissioning of the furnace and the results are obtained. Good verification results.
The simulation results of the flow field and gas distribution in the glass melt show that: (1) there are four main circulations in the glass melt of the float glass melting furnace with clamped neck cooling water tank and bubbling vessel; (2) Compared with the ordinary float glass melting furnace, the oxygen combustion float glass melting furnace has a better temperature regime. The glass liquid circulation is faster and the hot spot temperature at the bottom of the glass tank is higher. Therefore, it is easy to cause mirabilite (clarifier) to decompose too quickly in the homogenization area before making the hot spot. After the hot spot, more bubbles are formed in the short time of the glass melt, and it is difficult to eliminate and form a "foam layer". (3) CO2 in the glass melt before the homogenization of the furnace is clarified. The high concentration of SO3 and SO3 will directly affect the diffusion of gas inside small bubbles in the glass melt, which makes it difficult to eliminate bubble defects.
Based on the analysis of the reasons for the difficulty of bubble clarification in the furnace, the optimum adjustment measures and technical parameters for the furnace are put forward as follows: (1) the optimum adjustment measures and parameters of the bubbler are as follows: (1) the row of bubblers, 13.14 m from the front wall of the feeding pool, 20 bubbles, 0.452 m between bubbles, 20 bubbles per minute per single bubbler, and the guarantee is given. The total flow rate per unit gas of bubbler is 1.50Nm3/h; (2) the optimum adjusting measures and parameters of the cooling water pack for the neck of the bubbler: the number of the cooling water packs for the neck of the bubbler is 1, 33.936m away from the front wall of the feeding pool, and the depth of the liquid surface is 0.45m; (3) the optimum parameters of the hot spot of the melting glass: the hot spot is 1.15m away from the liquid surface, 18.38m away from the front wall of the feeding pool, and the hot spot temperature is (4) Optimum distribution mode of temperature system: Adopting "double hot spot" furnace temperature distribution system is more conducive to melting and clarification.
Through the application of mathematical simulation, the bubble problem of oxy-fuel float glass furnace is studied, and the optimization measures are put forward through mathematical simulation. The adjustment process of actual production is guided, and the bubble problem of the furnace is greatly improved. The practicability of the mathematical model is shown. At the same time, it is also used for oxy-fuel float glass melting. The kiln has played a guiding role in the technology popularization of our country.
【學(xué)位授予單位】：海南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ171.721

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