Reduction in heat loss through modified design tuyeres in Blast Furnace

摘要

Blastfurnace uses highly pure copper (>99.7%), water-cooled nozzles (tuyeres) as the injection point for high velocity, pre-heated air mixture to the blast furnace for iron oxide reduction. The tuyere is the device that allows heated air to be blown into the combustion raceway of the blast furnace. Exposed to a harsh and turbulent operating environment, the tuyere region is dynamic and complex, containing combustion gases, slags, molten iron, coke, pulverized coal and temperatures frequently exceeding 2,200°C. These tuyeres periodically fail and failure introduces furnace instability, increased costs and fuel rate, lost productivity, and increased safety and environmental exposure. Hard facing from outside and refractory lining from inside of tuyere, will help to protect erosion from coal and falling scab and it also helps to reduce heat flux through tuyere.