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1991•ISIJ InternationalOpen access

Gasification rate analysis of unburnt pulverized coal in blast furnace.

Yuji Iwanaga

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Abstract

Some fundamental experiments were carried out concerning the combustion reaction of PC (Pulverized Coai) blown into the tuyeres of a blast furnace and the eftects of resultant unburnt PCon in-furnace reactions.Themain results obtained are as fol]ows:(1) The gasification reaction rate of UPC is about 7 times as fast as that of coke.The presence of H2 promotes the reaction, while CO works opposite[y (2) As UPC (Unburnt Pulverized Coal) is gasified more quickly than lump coke, the degradation of coke in the raceway becomes less.In this way, PC blown into the b[ast furnace without burning was found to be effectively consumed.

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Some fundamental experiments were carried out concerning the combustion reaction of PC (Pulverized Coai) blown into the tuyeres of a blast furnace and the eftects of resultant unburnt PCon in-furnace reactions.Themain results obtained are as fol]ows:(1) The gasification reaction rate of UPC is about 7 times as fast as that of coke.The presence of H2 promotes the reaction, while CO works opposite[y (2) As UPC (Unburnt Pulverized Coal) is gasified more quickly than lump coke, the degradation of coke in the raceway becomes less.In this way, PC blown into the b[ast furnace without burning was found to be effectively consumed.

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Available abstract

Some fundamental experiments were carried out concerning the combustion reaction of PC (Pulverized Coai) blown into the tuyeres of a blast furnace and the eftects of resultant unburnt PCon in-furnace reactions.Themain results obtained are as fol]ows:(1) The gasification reaction rate of UPC is about 7 times as fast as that of coke.The presence of H2 promotes the reaction, while CO works opposite[y (2) As UPC (Unburnt Pulverized Coal) is gasified more quickly than lump coke, the degradation of coke in the raceway becomes less.In this way, PC blown into the b[ast furnace without burning was found to be effectively consumed.

Key concepts: Blast furnace, Pulverized coal-fired boiler, Tuyere, Raceway, Coke, Combustion, Metallurgy, Coal

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