本文選題：全氧燃燒　切入點：熔制氣氛　出處：《海南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近幾年,節(jié)能減排、提高玻璃成品率,已成為玻璃行業(yè)所關(guān)注的課題。以此為背景的全氧燃燒浮法熔窯技術(shù)在世界范圍內(nèi)獲得了非常廣泛的研究與應(yīng)用。Oxy-Fuel(全氧燃燒)是用02替代空氣成為助燃氣體與燃料混合燃燒的技術(shù)。與傳統(tǒng)空氣助燃技術(shù)相比,全氧燃燒工藝在節(jié)能減排的同時還能提升玻璃質(zhì)量,是浮法玻璃窯爐未來發(fā)展的新方向。 玻璃是由多相多組分晶態(tài)礦物原料經(jīng)過高溫且復(fù)雜的物化反應(yīng)最終形成均勻非晶態(tài)物質(zhì)的一個過程。因此,玻璃的制備是一種典型的物質(zhì)反應(yīng)過程。全氧燃燒玻璃熔窯技術(shù)的最大特點是窯爐氣氛的改變,玻璃熔窯中水蒸汽含量達到50%以上。玻璃熔體吸收水汽的能力特別強,熔體與水蒸氣大面積接觸,致使水分進入玻璃體后發(fā)生反應(yīng)并對玻璃的結(jié)構(gòu)網(wǎng)絡(luò)產(chǎn)生影響,導(dǎo)致玻璃的質(zhì)量和性能發(fā)生改變。水進入玻璃體后與玻璃熔體發(fā)生理化反應(yīng)會對玻璃的結(jié)構(gòu)網(wǎng)絡(luò)、質(zhì)量、性能產(chǎn)生何等的影響具有十分重要的研究價值。文本通過實驗室高溫氣氛爐模擬全氧燃燒熔窯氣氛(H2O:CO2=1:1)和過量水蒸氣氣氛,探索全氧燃燒熔制環(huán)境下玻璃配合料的最佳方案。同時,對全氧燃燒玻璃試樣的結(jié)構(gòu)網(wǎng)絡(luò)、羥基含量、熱膨脹系數(shù)、氣泡、耐水性及顯微硬度等性能進行測試,對影響全氧燃燒玻璃質(zhì)量及性能的各重點因素進行了分析討論。得出如下 結(jié)論： 1.全氧燃燒條件下芒硝含率1.5～2.0%、碳粉含率3.0%時玻璃的澄清質(zhì)量最好。 2.與空氣助燃相比,全氧燃燒過量水蒸氣氣氛燃燒環(huán)境下隨著玻璃熔體中羥基(-OH)含量的增多,玻璃的維氏顯微硬度平均下降了約5.6%。玻璃的熱膨脹系數(shù)升高,玻璃的耐水性、軟化點溫度以及玻璃中氣泡數(shù)目都逐漸降低。 3.全氧燃燒環(huán)境下,通過實驗發(fā)現(xiàn)全氧燃燒配合料中最好使用低含水量碎玻璃,避免使用高含水碎玻璃所造成玻璃中含水量過高而導(dǎo)致性能大幅度減弱的問題。同時使用低含水碎玻璃的用量在35%左右為宜。 4.29Si MAS-NMR結(jié)果顯示高含水玻璃結(jié)構(gòu)網(wǎng)絡(luò)中Q(4)比例減少,Q(3)和Q(2)比例升高。水蒸汽對玻璃熔體內(nèi)部網(wǎng)絡(luò)結(jié)構(gòu)產(chǎn)生了影響,玻璃體結(jié)構(gòu)網(wǎng)絡(luò)的變化對玻璃性能有顯著的影響。 5.通過計算發(fā)現(xiàn)在全氧燃燒條件下(H2O:CO2=1:1)玻璃熔體中堿含量損失比空氣助燃多0.0925mass%。因此全氧燃燒玻璃配合料要比空氣助燃配合料中純堿的揮發(fā)率基值高出0.352%左右才能確保全氧燃燒玻璃成品中堿含量的穩(wěn)定。 6.實驗室模擬全氧燃燒工藝條件下采用高溫熔化(1580℃、0.5h)和低溫澄清(1450℃、3h)能有效減少玻璃熔體中氣泡數(shù)量,提高玻璃質(zhì)量。
[Abstract]:In recent years, energy saving and emission reduction, improving glass yield, In this background, full oxygen combustion float furnace technology has been widely studied and applied all over the world. Oxy-Fuel.Oxy-Fuel is to replace air to become combustion gas and combustion. Combustible combustion technology. Compared with conventional air combustion technology, Total oxygen combustion process can improve the quality of glass while saving energy and reducing emissions, which is a new direction for the development of float glass kiln in the future. Glass is a process in which heterogeneous multicomponent crystalline mineral materials undergo high temperature and complex physicochemical reactions to form homogeneous amorphous substances. The preparation of glass is a typical material reaction process. The most characteristic of the glass furnace technology is the change of atmosphere in the furnace. The water vapor content in the glass furnace reaches more than 50%. The glass melt has a particularly strong ability to absorb water vapor. When the melt is in contact with the water vapor in a large area, the moisture will react when it enters the vitreous body and affect the structure network of the glass. It changes the quality and properties of the glass. When water enters the glass body, it reacts with the glass melt in physical and chemical way, which will affect the structure and quality of the glass. It is of great value to study the effect of performance. The paper simulates the atmosphere of total oxygen combustion furnace H _ 2O _ 2 CO _ 2 / 1: 1) and excess steam atmosphere through a laboratory high temperature atmosphere furnace. The optimum scheme of glass mixture in the environment of total oxygen combustion and melting was explored. The properties of structure network, hydroxyl content, thermal expansion coefficient, bubble, water resistance and microhardness of the glass sample were tested. The key factors affecting the quality and properties of the total oxygen combustion glass are analyzed and discussed. The following results are obtained. Conclusion:. 1. Under the condition of total oxygen combustion, the quality of clear glass is the best when the content of glauber is 1.5 ~ 2.0 and the content of carbon powder is 3.0. 2.Compared with air combustion, the Vickers microhardness of the glass decreased by about 5.6 with the increase of the content of hydroxyl group in the glass melt, and the thermal expansion coefficient of the glass increased, and the water resistance of the glass increased, and the water resistance of the glass increased with the increase of the content of hydroxyl group in the glass melt. The softening point temperature and the number of bubbles in the glass gradually decreased. 3. In the environment of total oxygen combustion, it is found that it is best to use broken glass with low water content in the mixture of total oxygen combustion. To avoid the problem of excessive water content in glass caused by the use of high water content broken glass, which leads to the greatly weakening of properties. At the same time, it is appropriate to use low water content broken glass at about 35%. 4.29Si MAS-NMR results show that the ratio of Q _ (4) and Q _ (2) increases in the glass network with high water content. Water vapor has an effect on the internal network structure of glass melt, and the change of glass structure network has a significant effect on the glass properties. 5. It is found by calculation that the loss of alkali content in glass melts is 0.0925% more than that in air-assisted combustion under the condition of total oxygen combustion. Therefore, the volatilization base value of soda in total oxygen combustion glass mixture is about 0.352% higher than that in air combustion-supporting mixture. To preserve the stability of alkali content in the finished product of oxygen combustion glass. 6. Under the conditions of simulated total oxygen combustion in laboratory, high temperature melting (1580 鈩，

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