高炉操業方法 - jfe Steel Corporation

Title:

高炉操業方法

Document Type and Number:

Japanese Patent JP4743332

Kind Code:

B2

Abstract:

In a blast furnace operation in which air or oxygen-enriched air is blown from tuyeres, upon letting a throat radius be R 0 , a position at a depth of R 0 from a stock line be p 1 , and a position at 1/3 of the overall height of a shaft from the lower end of the shaft be p 2 , a preheating gas "g" is injected into the furnace from a gas injection portion "A" arranged between the positions p 1 and p 2 in the height direction of the furnace. It is possible to prevent the occurrence of inappropriate furnace conditions during low-RAR operation, in particular, an inadequate increase in the temperature of burden materials in an upper portion of the furnace. Furthermore, the stability of the descent of raw materials can be maintained without causing fluidization or stirring of charged layers of the raw materials due to the injection of the gas from the shaft. The preheating gas is injected from gas injection portions A at a linear velocity of 102 (m/s) or less.

Inventors:

Taihei Nouchi
Minoru Asanuma
Takeru Sato
Akinori Murao
Naoyuki Takeuchi

Application Number:

JP2010102884A

Publication Date:

August 10, 2011

Filing Date:

April 28, 2010

Export Citation:

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