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Show ADVANCED STEEL REHEAT FURNACE 1997 AFRC INTERNATIONAL SYMPOSIUM Authors D. Moyeda, M . Sheldon, R. Koppang Energy and Environmental Research Corp. Irvine, CA, 92618 M. Lanyi, X. Li, B. Eleazer, Air Products and Chemicals, Inc. Allentown, P A 18195 Abstract Energy and Environmental Research Corp. (EER) under a contract from the Department of Energy i is pursuing the development and demonstration of an Advanced Steel Reheating Furnace. This paper reports the results of Phase I, Research, which has evaluated an advanced furnace concept incorporating two proven and commercialized technologies previously applied to other high temperature combustion applications: • EER's gas reburn technology (GR) for post combustion NOx control • Air Product's oxy-fuel enrichment air (OEA) for improved flame heat transfer in the heating zones of the furnace. The combined technologies feature: • greater production throughput with associated furnace efficiency improvements • lowered N O x emissions • better control over the furnace atmosphere, whether oxidizing or reducing, leading to better control over surface finish. Introduction Steel reheat furnaces are a work horse of the industry, processing some 100 million tons of steel annually while consuming about 150 to 200 1012 BTU. These furnaces fire a variety of fuels, most commonally by-product and natural gas with heat inputs ranging from 50 to 400 MMBtu/hr. Because high temperature steel (<2200 °F) is produced, furnace efficiencies tend to be low (30 to 60 % ) , even when recuperated. Further, these furnaces can be bottle necks when expanding a rolling mill, requiring major modifications such as hearth enlargement and/or burner zone additions. They are also typically large source emitters of N O x , 0.2 to 0.4 lb/MMBtu. Permitting for expansions potentially increases N O emissions and may trigger offset requirements. Therefore, what is a required is a technology which can address the issues of N O reduction and capacity expansion singularly or in combination. In the Advanced Steel Reheat Furnace concept, the heating process is conceptually divided into three zones. Starting at the finish end of the furnace where fully reheated steel is discharged we have: D O E Grant No. DE-FG03-96ER 12200/AOOO 1 |
