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Energy-Efficient Oxy-Fuel Glass Furnace from China Suppliers - High Temperature Production at Factory Rates
Description
REFTECH oxyfuel furnaces are specially designed for the particular characteristics of firing a furnace with fuel and oxygen. Especially the reduced flue gas volume requires a modification of the superstructure design. If flat flame burners are used, the arch has to be kept relatively low, otherwise it will become too cold and this will lead to rat holes.
For longer life, the exhaust can be placed rather in direction of the middle of the furnace or even near the throat thus ensuring an adequate heating in batch charging area due to burners in this area and reducing carry-over (dust). Too high flue gas velocities in exhaust and subsequent piping can lead to difficulties in furnace pressure control and can even lead to high furnace pressure due to insufficient flue gas flow rate.
Cold spots would lead to damages due to the infiltration of alkalis which cause burnouts in the arch, thus leading to reduced furnace life. To avoid such problems the REFTECH® oxyfuel furnaces are therefore adequately insulated and sealed. In general oxyfuel furnaces are used for a melting output of 50 – 400 t/d, in some special cases as small as 2 t/d specialty glass. The maximum furnace size is approximately the same as for regenerative cross-fired furnaces, i.e. 750 t/d.
Features
1
Low investment costs for flue gas equipment due to low flue gas volume
2
Low energy consumption
3
Higher melting surface load
4
Reduced NOx emission
5
High glass quality
6
Low investment costs for refractories
7
Easily adjustable temperature profile due to lateral arrangement of burners
8
Shorter time from glass to glass
Frequently Asked Questions
What is the typical melting output of REFTECH oxyfuel furnaces?
Generally, REFTECH oxyfuel furnaces are utilized for a melting output of 50 to 400 t/d. In special cases, they can be designed for capacities as small as 2 t/d for specialty glass, while the maximum furnace size can reach approximately 750 t/d.
Why do oxyfuel furnaces require a modified superstructure design?
The modifications are necessary due to the reduced flue gas volume typical of firing a furnace with fuel and oxygen. For instance, when flat flame burners are used, the arch must be kept relatively low to prevent it from becoming too cold, which could otherwise lead to rat holes.
How does the exhaust placement affect the furnace life?
Placing the exhaust towards the middle of the furnace or near the throat ensures adequate heating in the batch charging area due to the burners in that zone. This configuration helps reduce carry-over (dust), ultimately extending the overall lifespan of the furnace.
How are cold spots and alkali infiltration damages prevented?
Cold spots can cause alkali infiltration, leading to burnouts in the arch and a reduced furnace life. To prevent these issues, REFTECH® oxyfuel furnaces are designed to be adequately insulated and sealed.
What are the primary investment cost advantages of these furnaces?
REFTECH oxyfuel furnaces offer low investment costs for flue gas equipment due to the lower flue gas volume, as well as reduced investment costs for refractories.
What can cause difficulties in furnace pressure control?
Too high flue gas velocities in the exhaust and subsequent piping can lead to difficulties in furnace pressure control. This can even result in high furnace pressure due to an insufficient flue gas flow rate.