Place of Origin:
China
Brand Name:
Hengyang
Certification:
ISO9001
Model Number:
HC-532
A problem faced by the primary metal and glass industries is their intense energy usage. The secondary aluminum industry alone, expends about 1,000 Btu per pound of aluminum to remove oil, paint, plastics and other organics from the scrap. Another 3,000 Btu per pound is used in melting the scrap for a total energy use of 4,000 Btu per pound. The glass industry uses about 4 MMBtu per ton of batch and cullet to make glass bottles. Additionally, emissions and generation of waste materials are also industry problems.
The de-coating is a thermal treatment applied on the aluminium scrap, used to remove from the surface of the material all the contaminants as paper, oil, links, paint, plastic.
The aluminium scrap is used as “raw material” to produce new aluminium but before to be molten again has to be “cleaned”, i.e. treated inside a de-coating unit, in order to reach the specific characteristics requested. If the scrap is not cleaned (de-coated) and is molten directly inside the furnace, the metal loss increases and the presence of contaminants in the furnace might create problems to the use of the regenerative burners, producing at the same time an additional cost of the natural gas used in the melting. The cleaning process is based on heating the aluminium scraps in a controlled low oxygen atmosphere, through direct convective exchange with exhaust fumes, which have been processed into post-combustion chamber. The experience on existing pyrolysis plants, allow to cover the following scraps: turning, cover, ground, cans, tubes or caps, cables, sheets laminated with paper or plastic, sheets coated.
The HENGYANG INDUSTRY has significant advantages over conventional equipment: energy reduction, emissions reduction, production increase, and baghouse dust reduction. Each is described.
Energy Reduction
Current dryers use 1,000 Btu/lbm. Most or all of this can be eliminated with the HENGYANG INDUSTRY.
Emissions
The Clean Air Act effect on the secondary aluminum industry are now being debated and will be settled shortly with the Best Demonstrable Technologies to be mandated. It is not likely the current dryers will meet the new standards whereas the HENGYANG INDUSTRY might. HENGYANG INDUSTRY emission measurements made by ERCo have shown low values of NOx, SOx, VOC, and CO are achieved. CO2 emissions would also be reduced in direct proportion to the reduction in firing rate.
Production Increase
Currently, conventional furnaces lose about 8 to 10% of their furnace melt as dross. Some of this loss is attributable to the poor decoating process, though how much is speculative. Further, dust creation in the current kiln of 6 to 7% could be avoided with
the HENGYANG INDUSTRY.
Scrap Purchases
Aluminum smelters could possibly process lower grade scrap not possible now. For instance, aluminum foil (such as candy wrappers) will undergo significant oxidation in their current kiln since the foil is so thin. Testing of Hengyang showed that foil could be readily decoated with no oxidation.
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