| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.32 ( March 1995 ) Ironmaking Technology, Secondary Refining, and Center-Segregation Control with Forging in CC ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Technology for Prolonging Campaign Life of Blast Furnace Keiji Kobayashi, Toshiyuki Matsumoto, Katsuhiko Yanagisawa |
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Synopsis : The Chiba No.6 blast furnace with an inner volume of 4500 m3 has operated for 16 years without intermediate relining since June 1977. It has achieved a record of long campaign life and accumulated iron production to the class of 4000 m3 inner volume. This record has been established with a new furnace design, total instrumentation and control system, operation control technology and good maintenance. Lower shaft of the furnace was protected with lower thermal heat load by burden distribution control with Paul Wurth bell-less top charging facility. Upper shaft was rather damaged, and water-cooled panels (like stave coolers) were installed to keep good furnace profile and smooth furnace operation. Erosion of hearth brickwork was estimated with the application of a hearth erosion model using boundary element method (BEM). No severe erosin is found. More than 19 years of service life is expected with stable furnace operation. |
| TextiPDF: 10p./533kbj |