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Yuhua Fused Cast
Why can't the glass furnace be shut down after ignition?
Time：
Nov 08,2025
The glass furnace is one of the most critical pieces of equipment in the glass manufacturing process. In a specialized environment, it uses electric heating or fuel to melt raw materials at high temperatures, transforming them into liquid glass. This molten glass is then shaped—either by pressing through molds or by blowing—to produce a wide variety of finished glass products. The temperature inside the furnace can reach as high as 1500–1600 °C Above all, the melting capacity of the glass furnace directly determines the quality and output of glass products.
The reason why the furnace cannot be shut down
1. Glass kilns are difficult to cool.
The temperature inside the glass furnace is unusually high. If the cooling process after shutdown is not handled properly, it can easily lead to thermal expansion and contraction damage of refractory materials such as electric-fused zirconia-corundum bricks within the furnace. This, in turn, will severely affect the stable operation and service life of the glass furnace. Moreover, once the furnace is shut down, the molten glass will solidify rapidly, causing equipment blockages and damage. Subsequent cleanup will require significant investments of both material and human resources. Later, restarting the furnace will necessitate extensive maintenance tasks, including rebuilding the refractory lining and replacing insulation materials, ultimately resulting in substantial financial losses for the company.
2. Restarting the glass furnace is costly.
After a glass kiln cools down, restarting it becomes extremely challenging, requiring significant amounts of fuel and electricity. Moreover, this process can damage or even cause the refractory materials inside the kiln to crack, posing serious safety risks.
3. Kiln shutdown affects production
Unlike other industrial equipment, the downtime of a glass furnace is difficult to predict—once it shuts down, the entire glass production line is forced to halt. Restarting the furnace requires significant manpower, resources, and time, inevitably leading to a substantial drop in production output and severely impacting the company’s financial performance.
4. Furnace shutdown affects product quality
After restarting, temperature fluctuations can lead to an imbalance in internal glass stress, resulting in bubbles, cracks, or spontaneous breakage.
How to ensure the stable operation of glass kilns
1. Regular maintenance and upkeep
During kiln operation, regularly inspect and replace refractory materials such as bricks and insulation materials to prevent damage. At all times, maintain stable temperature and pressure inside the kiln, and minimize fluctuations in the kiln's operational load.
2. Full-team collaboration
The stable operation of the kiln requires collaboration from everyone. All personnel must follow safety operating procedures to prevent unstable kiln performance caused by improper human actions. This is especially true for controlling the liquid surface temperature, managing the feeding rate, and properly using cooling air.
3. Strengthen equipment management
Strengthen the management of kiln equipment, establish a comprehensive quality control and equipment performance monitoring system, and promptly identify and address any malfunctions in kiln equipment.
4. Identify problems and address them promptly.
During the operation of the kiln, closely monitor the performance of each component. If you notice any abnormal fluctuations, inspect and address them promptly—don’t be careless, as minor issues left untreated can lead to more serious problems that are much harder to fix!
In glass production, the glass furnace is an indispensable piece of equipment and serves as the cornerstone of the glass industry—any downtime can lead to substantial losses for businesses. Therefore, companies must prioritize the maintenance and management of furnace equipment to ensure stable operation, ultimately enhancing both the quality and output of glass products.
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