2. The Issue
The Aluminium industry is a very energy intensive industry. It uses furnaces at very high
temperatures to prepare the aluminium, either in primary or in secondary process.
The most use process is Hall-Héroult process .
The new regulation on air pollutants will put an additional stress on this industry to maintain the
NOx emissions below regulatory limits.
The industry is always looking for ways to reduce their energy costs, consumption, emissions
and carbon footprint.
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3. Our business model
Sammo Energy Ltd is proposing to bring a full solution for the issue of the industry.
Sammo Energy proposes to invest its own resources to bring the solutions to the industry using
the following approach:
• Full solution implementation integrating power generation and batch preheating;
• No investment needed from the industry, Sammo Energy makes all the necessary
investment from its own resources;
• No adverse impact on the production process, the industry benefits only from the upsides;
• A complete monitoring system documents the benefits and performances of the systems;
• Using a long term power purchase agreement guarantees a price of energy lower than
the market price. The industry saves money from the very first day of operation of the
system;
• The basic principle is to share all side benefits such as carbon emission reduction
incentives, grants, etc. All those programs are managed by Sammo Energy in full
transparency;
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4. g and aluminum smelting (Figure 2-1). The primary aluminum is defined as “the weight delicate heat balance in the Hall-Héroult cell which must be maintained
unavoidable due to the
d aluminum as tapped from the pots excluding the weight of any alloying materials as protection of side lining. Excessive insulation of the cell would lead to
for process reasons and
Principles
failures in the cell construction since the used materials for conducting the current to the
at of any metal produced from either returned scrap or remelted materials” (Plunkert
electrodes cannot withstand temperatures of 800 to 900°C indefinitely. In addition, the
The secondary aluminum production is the recycling of returned scrap or remelted the inner side walls would be prevented and may lead to erosion and
formation of ledge on
early lining failure (Grjotheim and Kvande 1993).
ls. Primary and secondary aluminum are cast, rolled or extruded before processed
in various industrial processes.
Approximately 30-45% of the total waste heat is carried away by the exhaust gas which is
drawn from the cell (Grjotheim and Kvande 1993, Abbas et al. 2009). The remainder of the
cell´s waste heat is lost by heat transfer through the side walls ( 35%), anode rods ( 8%),
collector bar ( 8%), deck ( 7%), and bottom ( 7%) of a typical cell as shown in Figure 2-6.
Recovering some of this thermal energy may be economically attractive.
Figure 2-6. Typical Hall-Héroult cell loss distribution (Grjotheim and Kvande 1993).
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2-1. Flow diagram of major steps in primary and secondary aluminum production, and
um processing (EMT c2004).
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5. Our Operational approach
Based on Hall-Heroult process example from iceland
Waste heat flow 220ºC
220ºC
1 000 000 m3/hr
Thermal power of
waste heat flow is
about 34500 kWth Power Generation
about 5950 kW
Waste heat flow
120ºC
To the Filters
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6. Our Operational approach
In Aluminium making industry, all furnaces uses high temperatures and release large quantities of
heat into the atmosphere one way or another wasting precious energy.
Our approach is the following:
• Make a survey of all waste heat sources available with temperature usable by conversion
solutions;
• Evaluate the coordinated way of using those sources of waste heat;
Based on the quantity of waste heat and its temperature, the optimum set of technologies will be
selected:
• Organic Rankine Cycle Turbines;
• Steam Rankine Turbines;
• Kalina Cycle Turbines;
• Other specific technologies;
The technologies used and their suppliers must be industry grade and demonstrate sufficient track
record.
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7. Don’t hesitate to contact us for any
complementary information you may need
Email: contact@sammoenergy.com
Web: www.sammoenergy.com
Linkedin : http://www.linkedin.com/company/sammo-energy-england-
blog : http://smartenergies.wordpress.com/
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