#207 - Tenova Goodfellow to optimize twin shell EAFs at Steel Dynamics Inc.

Mississauga, 17 February 2015: Tenova Goodfellow receives PO for two (2) EFSOP holistic optimization® systems including water detection for both twin shell EAFs at Steel Dynamics Inc. Butler, IN.

In Post #205, we discussed the basic operation of an electric arc furnace (EAF). One of type EAF is known as ‘twin shell’. From Wikipedia:

The scrap basket is then taken to the melt shop, the roof is swung off the furnace, and the furnace is charged with scrap from the basket. Charging is one of the more dangerous operations for the EAF operators…In some twin-shell furnaces, the scrap is charged into the second shell while the first is being melted down, and pre-heated with off-gas from the active shell…After charging, the roof is swung back over the furnace and meltdown commences. The electrodes are lowered onto the scrap, an arc is struck and the electrodes are then set to bore into the layer of shred at the top of the furnace. Lower voltages are selected for this first part of the operation to protect the roof and walls from excessive heat and damage from the arcs. Once the electrodes have reached the heavy melt at the base of the furnace and the arcs are shielded by the scrap, the voltage can be increased and the electrodes raised slightly, lengthening the arcs and increasing power to the melt. This enables a molten pool to form more rapidly, reducing tap-to-tap times.

Tenova Goodfellow has significant expertise in making this and other types of EAF operate more efficiently and effectively.

Steel Dynamics Inc., has confirmed an order with Tenova Goodfellow for the supply and purchase of two (2) EFSOP holistic optimization® systems for both EAF batteries at their SDI, Butler, IN steelmaking facility. Tenova’s innovative technology and value proposition will provide full spectrum evaluation via upstream and downstream offgas analysis and water detection technology for all 4 EAF shells. The scope of supply will also include newly developed optical sensors for the measuring of off-gas velocity and temperature.

The order which was received in December 2014, included project work that was scheduled to begin immediately with the manufacturing of hardware & sensors at TGI’s Hamilton, ON production facility, Nova Analytical Systems. Installation and commissioning of the systems is scheduled to take place by April 2015.

About SDI Steel Dynamics, Inc. - one of the largest domestic steel producers and metals recyclers in the United States based on estimated annual steelmaking and metals recycling capability, with annual sales of $7.4 billion in 2013, over 7,400 employees, and manufacturing facilities primarily located throughout the United States (including six steel mills, six steel processing facilities, two iron production facilities, over 90 metals recycling locations and six steel fabrication plants).

About Tenova Goodfellow - part of the Metals Division of Tenova and is a leader in the design and supply of process control technology for the EAF and BOF markets. Tenova is a worldwide supplier of advanced technologies, products and engineering services for the iron & steel and mining industries providing innovative, integrated solutions for complete process areas. Tenova's network companies operate in 26 countries on 5 continents with more than 4,900 people.

For more information on EAF optimization, please contact:

Tenova Goodfellow Inc.

6711 Mississauga Road, Suite 200

Mississauga, ON

L5N 2W3 - Canada

Phone +1 905 567 3030

Fax +1 905 567 3899

goodfellow@ca.tenovagroup.com

#63 - Oxygen Deficiency Monitoring in Ambient Air

The average human breathes more than 20,000 times per day. Under normal conditions most people can only survive for a few short minutes without oxygen. After this, damage to the brain will result. Breathing is therefore a serious matter.

Being without oxygen does not always imply that the person is not breathing. Respiration of oxygen deficient atmospheres is potentially even more dangerous than obvious cessation of breathing. This is because the person may continue to function while possibly advancing more deeply into an area deficient of oxygen. Without warning, the person may be over-come by asphyxia, which is a loss of consciousness caused by too little oxygen in the blood.

In industry, a common cause of oxygen deficiency is oxygen displacement. This can occur where another denser gas has leaked and settled into an area, creating a stratum of O2 deficient atmosphere. The leaked gas may not be poisonous in itself. But its displacement of oxygen makes it extremely dangerous. In some applications, gas toxicity and O2 deficiency risks are both present.

For example, I recently toured an electric arc furnace (EAF) installation at a steel plant. In the analyzer shed, there are two large gas analyzer systems which monitor the process gas for O2 / CO / CO2 / H2. These are gases of interest in the EAF application. A sample of these process gases is continuously piped into the analyzers in the shed for analysis. A feed of nitrogen (N2) is also piped into the shed for calibration and automatic filter blow-back.

If any of the piping, valves, or other components in the analyzer shed were to start leaking, this would pose a toxic gas risk or an O2 deficiency risk (depending on what was leaking). Therefore, there are two ambient air monitors in the analyzer shed. One for carbon monoxide and one for oxygen. (The carbon monoxide is monitored because it has the highest toxicity of the major gases being produced in this application.)

Nova Model 510 Continuous Oxygen Monitor and Model 580 Continuous Carbon Monoxide Monitor have been designed for this application.

These analyzers may be purchased in the following configurations:

• Without a pump for monitoring the diffuse atmosphere around the monitor.
• With a pump for pulling a sample from another area.
• With multiple remote sensors for monitoring several areas.

  

Model 510 brochure...

We make monitors for other gases such as:

• Carbon Monoxide (CO)
• Carbon Dioxide (CO2)
• Nitrogen Oxide (NO)
• Nitrogen Dioxide (NO2)
• Hydrogen Sulfide (H2S)
• Sulfur Dioxide (SO2)
• Chlorine (Cl2)
• Ammonia (NH3)
• Hydrogen Chloride (HCL)

For some examples, please see:
http://catalog.nova-gas.com/category/ttent-hazardous-wall-mounted-ambient-air-analyzers?&plpver=10

Give Mike or Dave at Nova a call, or send us an e-mail.
1-800-295-3771
sales at nova-gas dot com
websales at nova-gas dot com
www.nova-gas.com
http://www.tenovagroup.com/
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