25 percent Increased Reheating Throughput and 50 percent Reduced Fuel Consumption by Flameless Oxyfuel at ArcelorMittal Shelby - Tubular Products, Ohio

摘要

In 2005, ArcelorMittal Shelby, together with Linde, formerly known as Linde Gas, implemented a 5 percent oxygen enrichment technology on the Shelby, Ohio, seamless tube mill's rotary hearth furnace, resulting in a 29 percent fuel savings. Later, ArcelorMittal Shelby sought to boost heating capacity in order to increase the seamless tube mill output for larger billet dimensions while reducing fuel consumption. So in 2007, Linde led a four-month turnkey project to implement the Linde REBOX~R oxyfuel solutions at the furnace. The result was a 25 percent increase in reheating capacity and a 50 percent decrease in fuel consumption over oxy-enrichment. Overall, fuel consumption decreased by 65 percent versus airfuel. This paper explores the project's objectives and the implementation of flameless oxyfuel, with results from performance tests and daily operation, which also included improved temperature uniformity for better piercing results, a 50 percent reduction of scale formation, and minimized nitrogen oxide (NOx) and carbon dioxide (CO_2) emissions.