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Electric Melting Glass Furnace in China - Clean Energy Solutions from Leading Suppliers and Factory for Precision Control
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
1
No dusting of the batch due to flame gases
2
Usage of a very cheap bag filter system is possible
3
Suitable for production of special glass with expensive, volatile and aggressive components in the batch
4
No emissions due to firing (NOx, CO2)
5
Shorter lifetime and thus shorter time until improvement
6
Short time from glass to glass in case of brick to brick repair
Frequently Asked Questions
Where can the electrodes be installed in all-electric furnaces?
Electrodes can be installed in the furnace bottom, in the lateral walls of the tank, or inserted from the top. The most efficient concept is typically the use of top electrodes.
How are all-electric furnaces controlled?
Unlike fossil fuel furnaces, all-electric furnaces are controlled by electric resistance and batch thickness rather than temperature.
Why is the glass quality higher in all-electric furnaces?
The glass quality is higher due to the vertical melting process, which provides a higher specific pull compared to fossil fuel fired furnaces. This makes it ideal for producing high-quality specialty glass, such as optical glass.
What are the environmental advantages of all-electric furnaces?
All-electric furnaces produce no direct emissions from firing (such as NOx and CO2) and prevent batch dusting because there are no flame gases.
Are all-electric furnaces more energy-efficient?
Yes, their energy consumption is lower than fossil-fired furnaces, which is particularly beneficial and cost-efficient for smaller furnace operations.
What are the benefits regarding furnace maintenance and repair?
They offer a shorter lifetime which allows for quicker technological improvements, and they feature a very short "glass to glass" transition time during brick-to-brick repairs.