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Use of CBM in steel plants

By Piyush Pratik posted 10-12-2014 10:10 AM

  

Blast furnace operations use metallurgical coke to produce most of the energy required to melt the iron ore to iron. Since coke is becoming increasingly expensive, the steel industry is seeking low-capital options that reduce coke consumption, increase productivity and reduce operating costs. All blast furnaces in North America inject some type of supplement fuel, such as natural gas, coke oven gas, oils and tars, or coal to form additional carbon monoxide and hydrogen for combustion, and chemical reduction of iron-bearing materials into molten iron. Of these fuels, natural gas and pulverised coal are the most widely accepted for injection. Recent full-scale tests have shown that injecting natural gas into blast furnaces at the rate of 195.4 cubic meters per ton of hot metal can reduce coke consumption by 30%, and can increase iron-making capacity by 40%. Coal mine methane provides the same benefits as conventional natural gas, and could easily be substituted for, or mixed with, natural gas for blast furnace use as long as it meets gas quality requirements (low sulfur content and at least 94% methane). Injection of CBM in blast furnace of Bokaro Steel Plant will improve performance and can enhance its productivity.

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