Download e-book for iPad: 61st Conference on Glass Problems by III Charles H. Drummond

By III Charles H. Drummond

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First, it is specifically designed for integration with oxy-fuel-fired furnaces. Second, it incorporates exhaust gas cleaning to the most stringent regulatory levels. If the development program is successful, the resulting combined technology for glass melting promises to ofer a simpler and lower-cost means of melting glass than conventional air-fuel furnaces fitted with air pollution control systems. Background Preheating of batch and cullet has long intrigued the glass industry. Transferring the heat wasted from the furnace exhaust to the batch with corresponding improvements to furnace energy efficiency is the obvious motivation.

However, it also has the negative effect of shortening the minimum residence time of the glass along this path. A barrier booster incurs higher operating costs. Good results have also been achieved with barrier walls. However, when a barrier wall is used, a return current of fined glass from the deep refiner still occurs, and this mixes with the unfinished glass in the rear area of the furnace. In order to prevent this it is possible to raise the height of the wall until no return current exists.

Figure 2 shows the viscosity-temperature curve for a typical TV panel glass around lOOO"C, the temperature at which gob formation is usually taking place. Consider the viscosity around the working point of this glass (1028°C). 7%, - 30 much more than the entire tolerance range for the gob weight would allow. 1 wt% N+O is clearly noticed. If the use of recycled cullet from old TV sets is considered, the material will have to be analyzed very thoroughly. For some components, such as color components, the analytical technique is not sufficiently developed to be able to guarantee the quality of recycled cullet as fit for production of TV panel glass.

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61st Conference on Glass Problems by III Charles H. Drummond


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