Blast Furnace Hearth protection by using a Titanium compound at JSW Blast Furnace No. 4

摘要

A new technique of injecting a mixture of pulverized coal and small amounts of RUTILIT~? NF achieves a reduction of the temperatures in the hearth area and thus a quick and cost-effective wear protection of the hearth refractory. This article addresses the key strategies deployed to reduce the hearth side wall temperatures. The key strategies are (i) Ensuring proper blend ofR UTILIT~? NF with raw coal in pre-defined ratio (Ratio: Jellimba 98.3% + R UTILIT~? NF 1.7%); (ii) Charging RUTILIT~? NF compound continuously at 20 tpd (specific consumption of 2.23 Kg/thm); (iii) Continuous, un-interrupted PCI Injection; (iv) Ti accumulation observed through Ti balance, which confirms the formation of Ti (C, N and TiCxNi-x) compound inside the furnace, which acts as the protective layer. The use of RUTILIT~? NF medicine resulted in significant reduction in hearth refractory temperature below threshold limit (temperatures less than 300° C); reduction in variation of hearth refractory temperature indicates in all elevation and thus results in prolongation of campaign life of blast furnace (BF).