requirements. During the aluminum reduction process, the GTC performance key duties critical to the overall.
Ad-Flow™ impact


Constant gas flow operation
Smelter capacity creep encounters production limits due to
increased emissions from the GTC.

The problem
The increased load on the GTC, from a combination of increased temperature and reduced reaction rate (and possibly an increased alumina recycle rate) may increase GTC emissions higher than allowable with amperage creep.
The solution
Constant gas flow operation enables the full benefit of reduced filter differential pressure and reduced pulse cleaning frequency with the implementation of the Ad-Flow™ System.

Previously Achieved Reduction Results
Filter Differential Pressure
Filter Differential Pressure
Compressed Air Consumption
Particulate Emissions from the GTC
HF Gas Emissions from the GTC
Increased gas flow operation
Smelter capacity creep encounters production limits due to
increased emissions from the potroom roof.

The problem
As a result of amperage creep, the GTC struggles with increased gas flow and increased gas temperature. This results in higher roof emissions and many other production limitations.
The solution
After retrofitting with Ad-Flow™ technology, increasing gas flow to the GTC may be possible through fan adjustments. Although the benefits of Constant Gas Flow Operating Mode cannot be fully realized, experience has shown that measurable benefits are still possible with a gas flow increase up to 20%.

Optimized GTC operation
Smelter capacity creep encounters production limits due to
increased emissions from both the potroom roof and the GTC.

The problem
As a result of amperage creep, the GTC is unable to maintain sufficient gas flow and the adverse effect of the gas temperature increase on the HF adsorption reaction in the GTC is significant.
The solution
After retrofitting with Ad-Flow™ technology, a gas flow increase of approximately 10% often yields significant benefits in the GTC and lowers potroom roof emissions. These benefits are determined and limited by the same factors affecting the Increased Gas Flow Operation Mode.

Australian smelter
Ad-Flow™ filters installed
Reduction Results
Particulate
Emissions
HF Gas Emissions
from Dust Collector
HF Gas Emissions from Potline Roof
Differential Pressure
Pulse Cleaning Frequency
Compressed Air
Consumption
Fan Electricity
Consumption
Canadian smelter
Ad-Flow™ filters installed
Constant Gas Flow
Increased Gas Flow (8%)
p.a. Savings
p.a. Savings

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