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Electric Melting Glass Furnace in China - Suppliers for Clean Energy, Precision Control, & Factory Production Solutions
Description
It is possible to use rod electrodes with specially developed, water-cooled electrode holders or block electrodes. The electrodes can be installed in the furnace bottom or in the lateral walls of the tank or inserted from the top.
Appropriate positioning and wiring of the electrodes lead to reduced corrosion of the refractories and thus increase the furnace life. The most efficient concept is usually the usage of top electrodes. In case of a cold top furnace the batch is supplied by an area batch charger at an open side wall of the top. Alternatively a rotary roof can be used, which produces a homogenous and even batch layer. This layer insulates the glass bath from the environment, making additional insulation unnecessary. The melting, refining and homogenising processes in all electric furnaces are effected vertically.
All electric furnaces are not controlled by temperature but rather by electric resistance and batch thickness. There is a very delicate balance between these two measures making the furnace less flexible in respect to pull changes. The flexibility can be improved by means of furnace design.
The specific pull is higher and not comparable with fossil fuel fired furnaces due to vertical melting process. The glass quality can be drastically higher than in a fossil fuel fired furnace. For this reason, high quality specialty glass, e.g. for optical application, is molten with all electric furnaces.
The energy consumption of all electric furnaces is lower than the one of fossil fired furnaces. This is especially true for small furnaces, making small furnaces even more cost efficient. Increasing costs for CO2 allowances can be a deciding factor for all electric furnaces despite higher costs for electric energy in the near future.
Features
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No dusting of the batch due to flame gases
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Usage of a very cheap bag filter system is possible
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Suitable for production of special glass with expensive, volatile and aggressive components in the batch
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No emissions due to firing (NOx, CO2)
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Shorter lifetime and thus shorter time until improvement
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Short time from glass to glass in case of brick to brick repair
Frequently Asked Questions
How can electrode positioning extend furnace life?
Appropriate positioning and wiring of the electrodes lead to reduced corrosion of the refractories, which directly increases the overall furnace life.
What makes top electrodes highly efficient in electric furnaces?
Top electrodes are usually the most efficient concept. In cold top furnaces, they allow the batch to form a homogenous and even layer that insulates the glass bath from the environment, eliminating the need for additional insulation.
How are all electric furnaces controlled compared to fossil-fired ones?
Instead of temperature, all electric furnaces are controlled by electric resistance and batch thickness. This delicate balance makes them less flexible with pull changes, though design adjustments can improve this.
Why is the glass quality higher in electric furnaces?
Due to the vertical melting process, the specific pull is higher, resulting in drastically higher glass quality compared to fossil fuel fired furnaces. This makes them ideal for high-quality specialty glass like optical applications.
Are all electric furnaces more energy and cost-efficient?
Yes, their energy consumption is lower than fossil-fired furnaces, particularly for small furnaces. Additionally, rising costs for CO2 allowances make electric furnaces an increasingly cost-effective option despite higher electricity costs.
What environmental advantages do these furnaces offer?
All electric furnaces produce no emissions due to firing (such as NOx and CO2). They also eliminate batch dusting because there are no flame gases.