The Use Of Combined-blast Is The Main Way To
Improve The Energy Efficiency Of Blast Furnaces
Author(s)
N. Spirin, V. Shvidkiy, Y. Yaroshenko & Y. Gordon
Abstract
The world production of hot metal and pig iron in 2012 reached 1.3 billion tons.
More than 500 million tons of metallurgical coke produced from 650 million
tons of expensive coking coals was consumed in blast furnaces to achieve this
production goal. Metallurgical coke is a major contributor to the production costs
of hot metal and pig iron, typically making up to 48–52% of the hot metal
operating cost. Because of this, the reduction in metallurgical coke consumption
was always a major goal for blast furnace operators. Supplemental fuels,
especially in the form of a combined blast, are typically used to reduce coke
consumption in a blast furnace. The major types of combined blast and
supplemental fuels are as follows: oxygen enrichment, natural gas, oil
and pulverized coal injection. The replacement coefficients of coke by these
supplement fuels depend on the fuel quality, the arrangement of the injection
process and adjustments in the blast furnace operating practice to optimize heat
and mass transfer processes, metallic yield, gas dynamics and material
movement. The fundamentals of the blast furnace process to achieve a highly
efficient operation of the blast furnace with combined blast are discussed in this
paper. The methodology of this research and development work is based on the
theory of heat transfer in a blast furnace combined with local and overall heat
and mass balances, the analysis of temperature distribution and material and gas
movement. As a result, the maximum achievable replacement coefficients and
reduction in the operating cost of hot metal were estimated alongside the
required adjustments in blast furnace operation.
Keywords: blast furnace, combined blast, heat transfer, principles of injection
fuel.
Keywords
blast furnace, combined blast, heat transfer, principles of injection
fuel.
Related Book
Other papers in this volume
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