Study Of The Reaction Of The Water Vapor And The Glass Melt Together With The Effects On The Structure And Property Of Glass Under The Oxy-fuel Combustion

In recent years, energy conservation and improvement of the yield of glass has become the main topic of glass industry. Therefore, oxy-Fuel Float Furnace technology has Obtained Extensive research and application around the world. However under oxy-fuel combustion, it removes the nitrogen from the oxidizer to carry out the combustion process in oxygen. Compared with the traditional oxidizing air technology, Oxy-fuel technology has advantages in both energy saving and upgrading the quality of glass. Therefore, Oxy-fuel technology is the future development direction of the glass industry.The most important feature of Oxy-Fuel is to change the furnace atmosphere. Because the water vapor content reach50%in the oxy-fuel combustion space. Glass melt has strong ability of absorption water vapor,and because of the large contacting between glass melt and water vapor, water reaction with glass melt Impact on the network structure of glass, which will result in the changing of quality and properties of the glass.Oxy-fuel firing environment was simulated through putting carbon dioxide and water vapor,of which the volume ratio is1:1and excess water vaporin into the atmosphere furnace. Finally finding the suitable glass batch in oxy-fuel firing atmosphere. In this work, we conducted systematic evaluation on the performances of the glasses prepared under different simulated atmosphere. In addition, based on the microstructural evolution analyzing by IR transmitting spectra and NMR spectra, we gave the structural origin of the changes of the performances of the glass samples.The research shows that:1. Under the condition of total oxygen combustion,the sodium sulphate content can reduce to1.0-2.0%,and the suitable carbon content to3.0%which made the best quality of the glass refining.2. Compared with air-fuel firing atmosphere,under oxy-fuel firing atmosphere condition,As-OH content increases in glass samples, and the microhardness is dropped by about5.6%averagely, and the water resistance has weakened compared with the ones prepared under air combustion. At the same time, heat expansion coefficient rises and softening point temperature、bubbles reduces.3.Adding cullet with different water content result in heat expansion coefficient and bubbles rises, together with the microhardness reduced at oxy-fuel firing atmosphere. However, Hydroxyl content has downward trend in final glass product because of the use of low water content cullet. At the same time, Hydroxyl content has rising trend in final glass product because of the use of high water content cullet. It is the best way to use Low water content of cullet and no more than35%content.4.According to the results of29Si MAS-NMR spectra,the content of Q(4) in the network of glasses drops with the increase of hydroxyl content, while the content of Q(3) and Q(2) increases.Therefore, the water vapor had made effect on the internal network structure of the glass, while structure changing of the network has a significant effect on the glass properties.5. By calculating under oxy-fuel firing atmosphere condition, we learn that alkali content Ioss0.0925mass%more than air-fuel conditions. So Axtra Alkali has increase0.352%at general values when prepare oxy-fuel bath which can insure the stability of the alkali content in oxy-fuel glass.6.The bubble number can be reduced distinctly and the glass quality be improved through taking the way of lowering the refining temperature(1450℃,3h) at simulation oxy-fuel condition.