Coping with High Blast Furnace Productivity by Improvising Drainage Practices  

Oleh:

Singh, Amit Kumar ; Dubey, Shivendra Kumar ; Murthy, G S R

Jenis: Article from Proceeding
Dalam koleksi: 12th ANQ Congress in Singapore, 5-8 Agustus 2014, page 1-15.
Topik: Blast Furnace; Productivity; Drainage; Tap hole clay and People Involvement
Fulltext: PM2-3.2-P0363.pdf (2.42MB)

Isi artikel

The blast furnace process is still the most commercially viable and versatile method of iron making. The size of blast furnaces ranges for 80 m3 to about 5700 m3 and the productivity ranges from 1 t m3/day to 4.0 t/m3/day. The Indian iron making industry has witnessed migration from smaller & medium to large blast furnaces in size coupled with adopting various productivity raising enablers like high top pressure, oxygen enrichment, high hot blast temperature and bell less top burden distributors in the last 5-7 years. However, cast house has always been the most exciting section as hot metal and slag, the high temperature liquid products, are handled here. Moreover, any productivity enabler will not be effective if the rise is production rate is not handled comfortably by equal improvement in drainage rate. F Blast Furnace, an 1830 m3 blast furnace at Tata Steel, Jamshedpur, was relined in FY’13 and its production was expected to rise from 1.34 MTPA to 1.42 MTPA due to enablers like high hot blast temperature leading drop in fuel rate. However, it has a bigger challenge at its cast house as the slag granulation system was expected to be commissioned in the next 6 months and the same cast house had to handle 4200 t of hot metal daily in place of 3750 t earlier. Considering the same, the management had planned a moderate daily production rate of 3650 in the first half of the FY’14. The operators had three well defined challenges of handling the slag in a single tilting runner which had historically very low availability, reducing the time between two casts and increasing the drainage rate. The slag tilting runner availability was improved by installing additional drive and cross functional approach of regular repair and cleaning. The cast to cast time was reduced to a level from 30 to 5 minutes by involving people at cast house and mechanization of the process. The drainage rate was improved by involving vendor partners in developing suitable clay products and increasing the life of the runners. Subsequently F BF finished 40,000 t ahead of its H-1 plan and produced 4000 t day in day out

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