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

By III Charles H. Drummond

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There have been many attempts at development of batch and cullet preheaters - too numerous to describe individually, but the observations so far can lead to the following general conclusions: There is sufficient heat in the exhaust gases to substantially preheat the batch and cullet. Preheat temperatures of about 572°F (300°C)' have typically been reported for air-fuel- and oxy-fuel-fired furnaces, respectively. * Long-term successful furnace operation has been achieved. While there have been concerns about deleterious effects on furnace operation from batch segregation and carryover of batch dust, proper design and operation can ameliorate these.

The glass forced upward by the bubbler sinks again, but it is likely that the colder glass will sink faster and the hotter glass more slowly. This should result in a separation of the glass in such a way that the hotter glass will probably move forward to be fined and the colder glass is more likely to remain in the furnace. If a barrier booster is installed in front of the fining shelf, the initial effect is similar to that of the bubbler. The temperature of the glass along the critical current path is increased, but the minimum residence time is not reduced as much as it is with bubbling.

Hoppers above and below the unit, along with material feeders, allowed control of material feed rates through the unit. In order to test a worst-case scenario, cullet-free batch was used throughout the test program. The following important results were obtained: Demonstration of concept: The key to the E-Batch concept is retention of batch inside the unit, that is, prevention of entrainment of fine batch dust into the flowing gases. This was positively demonstrated. Gas velocity: Scale-up economics depend strongly on the operating gas velocities in the interior channels of the module.

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