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Coke properties at tuyere level in blast furnace with pulverized coal injection

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Abstract

Coke in the blast furnace experiences great changes in their properties during the blast furnace operation. Pulverized Coal Injection (PCI) into the blast furnace through tuyeres together with oxygen enrichment affect coke properties and blast furnace operation. Using coke sampler at tuyere level, coke samples were collected and analysed at various coal injection rates in the both conventional and co-axial oxygen enrichment. With the help of information obtained from coke sampling experiments, gas permeability resistance index at lower part of blast furnace (LK) and mean size variation of coke were predicted and matched well with the measurements.

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Abbreviations

Dia:

tuyere diameter (mm)

VB:

blast volumetric rate (Nm3/min)

PD:

production rate of pig iron (ton/day)

Oxen:

amount of oxygen enrichment ratio (Nm3/hr)

TB:

temperature of blast air (°C)

HMT:

hot metal temperature (°C)

PCR:

pulverized coal injection ratio (Kg/t-p)

LK:

permeability resistance index in lower part of blast furnace (-)

K:

permeability resistance index in blast furnace (-)

MS:

charged coke mean size (mm)

CSR:

coke strength index after reaction with CO2 according to JIS 2151 (%)

DI:

coke strength in air according to JIS 2151 (%)

CSR’:

strength index of coke which is sampled from blast furnace, after reaction with CO2 (%)

DI’:

strength index of coke which is sampled from blast furnace, in air (%)

Dp :

estimated coke diameter in lower part of blast furnace (m)

ΔP:

pressure drop (Pa)

L:

thickness of particle bed (m)

u:

gas velocity in vacancy (m/s),

φ:

sphericity (-)

ρ:

gas density (Kg/m3)

μ:

gas Viscosity (Pa • s)

gc :

Newton’s law proportionality factor (Kg • m/N • s)

Core}:

amount of charged ore (Kg/day)

Ccoke}:

amount of charged coke (Kg/day)

Dore}:

bulk density of charged ore (Kg/m3)

Dcoke :

bulk density of charged coke (Kg/m3)

A’:

cross sectional area at above the cohesive layer (m2)

A“:

cross sectional area at below the cohesive layer (m2)

SP’:

burden speed at above the cohesive layer (mm/min)

SP“:

burden speed at below the cohesive layer (mm/min)

SP:

total burden speed in blast furnace (mm/min)

Hs :

height of BF above cohesive zone (mm)

HB :

height of BF below cohesive layer (mm)

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Authors and Affiliations

  1. Kwangyang Iron & Steelmaking Research Team, Technical Research Laboratories POSCO, 699 Kumho-dong, Kwangyang, 544-090, Cheonam, Korea

    Jin Kyung Chung, Jeong Whan Han & Jeong Ho Lee

  2. Department of Materials Engineering, Kyonggi University, 440-270, Suwon, Korea

    Jeong Whan Han

Authors
  1. Jin Kyung Chung
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  2. Jeong Whan Han
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  3. Jeong Ho Lee
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Chung, J.K., Han, J.W. & Lee, J.H. Coke properties at tuyere level in blast furnace with pulverized coal injection. Metals and Materials 2, 1–7 (1996). https://doi.org/10.1007/BF03025940

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  • DOI: https://doi.org/10.1007/BF03025940

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