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Aluminum Melting |
| Linde’s customers rely upon our state-of-the-art technologies in secondary aluminum processes, including aluminum scrap melting and the recovery of aluminum from dross.
Since 1988, Linde has provided oxyfuel technology to over 250 aluminum melting furnaces worldwide. The benefits of Linde’s technologies include:
- An increase in melting rate (up to 100%), increasing furnace throughput
- Lower energy consumption (up to 50%), reducing overall production costs
- Maintained or improved aluminum yield
- Lower flue gas volume (up to 80%) required, allowing easier and less expensive waste gas handling
- A smaller carbon footprint
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Linde’s low-temperature oxyfuel combustion technology technology, in which the flame is diluted by furnace flue gases, lowers the flame temperature.
This results in:
- More uniform heating
- Reduced dross formation
- Fewer NOx emissions
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The Flat Jet Burner is an oxyfuel burner; its unique flame shape helps deliver a high thermal radiation heat transfer to the surface of a molten aluminum bath. The Flat Jet produces a very wide and flat flame, resulting in a large bath coverage for a given power output. Most importantly, the nozzle design produces a staged, low-momentum flame that minimizes harmful emissions and reduces aluminum dross losses. Over a dozen reverberatory furnace Flat Jet technology installations are in operation; their owners enjoy the following benefits:
Fuel savings of up to 50%
Increased production rate (approximately 30%)
Emissions reductions (in the form of a greater-than 80% reduction in combustion by-products) and less NOx
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The AIROX burner allows aluminum companies to make their production processes more flexible and thus meet continuously changing plant conditions (e.g., fuel costs, feed material and production needs). Using oxyfuel or oxygen-enriched air-fuel combustion during the melting process, and switching over to air-fuel during holding times, reduces overall melting costs. AIROX allows a furnace operator to quickly change between firing with 100% oxygen and operating only with air – or with any intermediate oxygen-air composition – in a quick and simple manner.
The benefits of using AIROX technology include:
- A productivity increase of up to 35%, and greater operational flexibility
- Reduced energy consumption
- Lower emission levels
- A dynamic, simple switchover between oxyfuel and air-fuel
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WASTOX converts unwanted contaminants in low-quality aluminum scrap into valuable fuel. Combustion efficiency tests have shown that combustibles react more efficiently with a pure oxygen stream than with an oxygen-enriched flame. With an oxygen lance, combustion of volatile species when recycling beverage cans was almost absolute, with emission levels dropping below 0.01%; an oxygen-enriched oxyfuel flame reduced these same emissions to only 1%. With an air-fuel burner, 20–50 % of the coatings and other contaminants on the processed scrap are emitted as volatile organic compounds (VOCs), thus not achieving full combustion.
The benefits of using WASTOX oxygen lancing include:
- More opportunities to use contaminated, low-grade scrap
- Control and reduction of emissions
- Lower energy consumption
- Simple installation and operation in any furnace
Linde has over 10 years’ experience in the development and implementation of oxygen lancing systems. The WASTOX system is both versatile and easy to use, and it has been successfully deployed for both single- and double-pass installations in rotary salt and tiltable rotary furnaces.
To learn more about how your company can benefit from the use of AIROX or WASTOX technology, Contact Us.. |
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