From: Erik Boleman

Sent: Wednesday, August 02, 2006 12:00 PM To: Jack Kennedy; Beth Havlik; Erik Boleman; Tony Shob erg; Teresa L. Kinder; Andrew Skoglund Cc: George Pruchnofski; Mike Hansel; Joel Trinkle Subject: Discussion with Low-NOx Burner Vender
We finally tracked down the low-NOx burner vender!
Beth, Jack, and Erik had a phone conversation this morning with Koen Meijer of Danieli-Corus, and two of his co-workers. Their office is located in the Net herlands. The following is a description of the co mpany from their website ( http://www.danieli-corus.com/ ): Danieli Corus supplies tailor-made solutions for th e Primary Metals Industry. Using proven technology from Corus' state-of-te-art integrated m ills in The Netherlands and UK, as well as from our licensors and other world-wide sources, we help our clients achieve maximum performance. Based on specialized know-how and vas t operational experience, Danieli Cor us offers engineering and contracting services as well as consultancy in all areas of ironmaking and steelmaking and at all levels of development. From greenfield projects to advanced optimization in established operations, Danieli Corus supports i ts clients all over the world. Danieli Corus is a client-focused, solutions-driven company. It offers an integrated approach to all aspects essential to success in an increasingly competitive global in dustry. Danieli-Corus recently completed a major NOx study and low-NOx burner retrofit at a straight-grate taconite induration furnace. They looked at severa l technologies, including standard low-NOx burners and flue gas recirculation. But the best technolog y was a water-cooled burner to reduce the peak flam e temperature and therefore reduce thermal NOx format ion. A couple of details:

• 50% NOx reduction (if we heard correctly, the pre- installation NOx was 225 ppm or 380 mg/MJ)

• Straight grate furnace

• Air from preheater = 950*C

• Furnace temperature = 1300*C

• Furnace O2 concentration = 18%

• Burners were designed and constructed specifically for this application

• The new burners were designed to fit into the orig inal burner port

• This is the only facility that they have using tha t technology

• Water use is 0.1 to 1.0 liter of water per cubic m eter of natural gas

• Due to the water cooling, the gas consumption incr eased with the new burners but they didn’t know % increase

• Spent lots of time on the initial NOx technology s tudy

• Lot of engineering costs to design the correct bur ner

• The technology has not been sold outside of their company. No literature is available.

Our conclusions based on this conversation are:

• Since there is only one facility using the technol ogy and the technology has not been sold outside of their company, this probably is not an “availabl e” technology per BART

• However, we will pursue additional information fro m the vender and share it with the BART group and the clients

• If time allows, we will model a 50% control scenar io to see what improvement this technology would get PICS – do you agree with the approach that this is not an “available” technology?
Please contact me if you have any questions or comm ents.Erik Boleman

Barr Engineering Toll Free: (800) 786-5830 x8209 Office: (218) 529-8209 Mobile: (218) 393-9116

From: Erik Boleman Sent: Wednesday, August 02, 2006 11:13 AM To: 'Meijer, K' Cc: Erik Boleman; Beth Havlik; Jack Kennedy Subject: RE: Low-NOx Burners for Taconite Indurating Furnac es
Mr. Meijer, I would like to thank you and your colleagues for y our time and information. This technology seems qu ite promising and we look forward to learning more abou t it. As we discussed, we will get you some specific desi gn information either today or tomorrow morning. W e will get the following information:

• Number of burners

• Burner sizes (Million Btu/hr)

• Fuel type

• Air temperature

• Furnace temperature

• Existing NOx emissions Please let me know if you need any other informatio n. Thanks again,

Erik Boleman Barr Engineering Toll Free: (800) 786-5830 x8209 Office: (218) 529-8209 Mobile: (218) 393-9116